U.S. patent application number 13/596294 was filed with the patent office on 2013-02-28 for bending apparatus.
This patent application is currently assigned to OLYMPUS MEDICAL SYSTEMS CORP.. The applicant listed for this patent is Hiroki MORIYAMA, Yasuhiro OKAMOTO. Invention is credited to Hiroki MORIYAMA, Yasuhiro OKAMOTO.
Application Number | 20130047757 13/596294 |
Document ID | / |
Family ID | 46757774 |
Filed Date | 2013-02-28 |
United States Patent
Application |
20130047757 |
Kind Code |
A1 |
OKAMOTO; Yasuhiro ; et
al. |
February 28, 2013 |
BENDING APPARATUS
Abstract
A bending apparatus includes: a bending portion; an operation
element erected vertically from an operation portion having a
longitudinal axis and has a shaft portion in which a tilt direction
and tilt angle are changeable; a pulling member having one end
connected to the bending portion; a pulley on which a rotary body
around which the pulling member is wound is arranged; a motor that
generates a driving force that rotates the pulley to pull the
pulling member wound around the rotary body in a winding direction;
a hanging frame that extends in a diameter direction of the shaft
portion, and includes an attachment portion to which the other end
of the pulling member is attached; and an attachment path setting
member provided inside the operation portion, which changes a path
of the pulling to the longitudinal axis direction and guides the
pulling member to the attachment portion.
Inventors: |
OKAMOTO; Yasuhiro; (Tokyo,
JP) ; MORIYAMA; Hiroki; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
OKAMOTO; Yasuhiro
MORIYAMA; Hiroki |
Tokyo
Tokyo |
|
JP
JP |
|
|
Assignee: |
OLYMPUS MEDICAL SYSTEMS
CORP.
Tokyo
JP
|
Family ID: |
46757774 |
Appl. No.: |
13/596294 |
Filed: |
August 28, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/JP2012/053243 |
Feb 13, 2012 |
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13596294 |
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Current U.S.
Class: |
74/89.22 |
Current CPC
Class: |
Y10T 74/18848 20150115;
A61B 1/00066 20130101; A61B 1/0016 20130101; G02B 23/2476 20130101;
A61B 1/0052 20130101; A61B 1/0057 20130101; Y10T 74/2042
20150115 |
Class at
Publication: |
74/89.22 |
International
Class: |
F16H 21/52 20060101
F16H021/52 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 28, 2011 |
JP |
2011-042551 |
Claims
1. A bending apparatus, comprising: a bending portion; a grasping
portion that is included in an operation portion and has a
longitudinal axis, and that is grasped when effecting a bending
operation of the bending portion; an operation element that is
erected vertically from the operation portion, and that has a shaft
portion in which a tilt direction and a tilt angle are changeable;
a pulling member having one end connected to the bending portion; a
pulley that is disposed at a position that is deviated in the
longitudinal axis direction relative to the operation element, and
on which a rotary body around which an intermediate portion of the
pulling member is wound is arranged in a loosely fitting state; a
motor that is disposed at a position that is deviated in the
longitudinal axis direction relative to the operation element, and
that generates a driving force that rotates the pulley to pull the
pulling member that is wound around the rotary body arranged on the
pulley in a winding direction; a hanging frame that extends in a
diameter direction of the shaft portion of the operation element,
and that comprises an attachment portion to which the other end of
the pulling member that is wound around the rotary body is
attached; and an attachment path setting member that is provided
inside the operation portion and that leads the pulling member that
is wound around the rotary body in the longitudinal axis direction,
and changes a path of the pulling member that is led to a direction
of a longitudinal axis of the shaft portion to guide the pulling
member to the attachment portion.
2. The bending apparatus according to claim 1, wherein the
attachment path setting member is disposed on the longitudinal axis
of the shaft portion, and is provided at a position that is
separated by a predetermined distance from the hanging frame that
sways in accordance with a tilt operation of the shaft portion.
3. The bending apparatus according to claim 1, wherein the pulley
and the attachment path setting member are provided so as to be
separated by a predetermined distance in the longitudinal axis
direction of the grasping portion.
4. The bending apparatus according to claim 3, wherein the pulley
is disposed inside the grasping portion such that a rotary shaft of
the pulley is in a perpendicular positional relationship with
respect to the longitudinal axis of the grasping portion.
5. The bending apparatus according to claim 4, wherein; the motor
is arranged such that a drive shaft of the motor is disposed
perpendicular or parallel to the rotary shaft of the pulley inside
the grasping portion; the bending apparatus further comprising a
driving force transmitting mechanism that transmits the driving
force of the motor to the rotary shaft of the pulley.
6. The bending apparatus according to claim 1, wherein; the pulley
includes a first pulley and a second pulley that are disposed
parallel to each other, and a rotary shaft of each of the pulleys
is disposed inside the grasping portion in a perpendicular
positional relationship with respect to the longitudinal axis of
the grasping portion; and the motor is disposed inside the grasping
portion such that a drive shaft of the motor is in a coaxial,
parallel, or perpendicular positional relationship with respect to
the longitudinal axis of the grasping portion; the bending
apparatus further comprising: a driving force transmitting
mechanism portion that has a gear train comprising a plurality of
gears and that transmits the driving force of the motor to the
pulleys; and at least one of pulley lead-in members that divide
travel paths of a plurality of pulling members that are guided into
the operation portion into two and guide the pulling members to a
rotary body that is arranged on the first pulley and a rotary body
that is arranged on the second pulley, and pulley lead-out members
that guide travel paths of the pulling members that are extended
from the rotary body that is arranged on the first pulley and the
travel paths of the pulling members that are extended from the
rotary body that is arranged on the second pulley to the attachment
path changing members.
7. The bending apparatus according to claim 6, wherein the first
pulley and the second pulley are rotated in opposite directions to
each other by the driving force transmitting mechanism portion, and
a winding direction of a pulling member that is wound around the
rotary body that is arranged on the first pulley and a winding
direction of a pulling member that is wound around the rotary body
that is arranged on the second pulley are different to each
other.
8. The bending apparatus according to claim 6, wherein the first
pulley and the second pulley are rotated in identical directions by
the driving force transmitting mechanism portion, and a winding
direction of a pulling member that is wound around the rotary body
that is arranged on the first pulley and a winding direction of a
pulling member that is wound around the rotary body that is
arranged on the second pulley are identical directions.
9. The bending apparatus according to claim 7, wherein; the pulley
lead-in member, the pulley lead-out member, and the attachment path
setting member are provided in plurality in correspondence with a
plurality of pulling members, respectively; and the plurality of
pulley lead-in members and the plurality of pulley lead-out members
are assembled such that the plurality of pulley lead-in members and
the plurality of pulley lead-out members are divided into two first
support bodies and two second support bodies, respectively, in
correspondence with a pulling member that is wound around the
rotary body arranged on the first pulley and the pulling member
that is wound around the rotary body arranged on the second pulley,
and the plurality of attachment path setting members are disposed
at predetermined positions inside the operation portion in a state
in which the plurality of attachment path setting members are
pivotably assembled on a single support body.
10. The bending apparatus according to claim 8, wherein; the pulley
lead-in member, the pulley lead-out member, and the attachment path
setting member are provided in plurality in correspondence with a
plurality of pulling members, respectively; and the plurality of
pulley lead-in members and the plurality of pulley lead-out members
are assembled such that the plurality of pulley lead-in members and
the plurality of pulley lead-out members are divided into two first
support bodies and two second support bodies, respectively, in
correspondence with a pulling member that is wound around the
rotary body arranged on the first pulley and the pulling member
that is wound around the rotary body arranged on the second pulley,
and the plurality of attachment path setting members are disposed
at predetermined positions inside the operation portion in a state
in which the plurality of attachment path setting members are
pivotably assembled on a single support body.
11. The bending apparatus according to claim 9, wherein a pulley
lead-in member disposed on one of the first support bodies and a
pulley lead-out member disposed on one of the second support
bodies, and a pulley lead-in member disposed on the other of the
first support bodies and a pulley lead-out member disposed on the
other of the second support bodies are disposed at facing positions
such that a hypothetical line that joins a center of the first
pulley and a center of the second pulley is interposed
therebetween, and the support body on which the plurality of
attachment path setting members are disposed is disposed in an
intersecting positional relationship with respect to a longitudinal
axis of the operation portion and at a position such that a center
of the support body intersects with a longitudinal axis of the
operation element.
12. The bending apparatus according to claim 10, wherein a pulley
lead-in member disposed on one of the first support bodies and a
pulley lead-in member disposed on one of the second support bodies
are disposed such that a hypothetical line that joins a center of
the first pulley and a center of the second pulley is interposed
therebetween, a pulley lead-in member disposed on the other of the
first support bodies and a pulley lead-out member disposed on the
other of the second support bodies are disposed such that a
hypothetical line that joins the center of the first pulley and the
center of the second pulley is interposed therebetween, and the
support body on which the plurality of attachment path setting
members are disposed is disposed in an intersecting positional
relationship with respect to a longitudinal axis of the operation
portion and at a position such that a center of the support body
intersects with a longitudinal axis of the operation element.
13. The bending apparatus according to claim 12, wherein; in a
configuration in which two rotary bodies around which the pulling
members are wound are disposed on the first pulley and the second
pulley, respectively, an interval between the two rotary bodies
disposed on the second pulley is wider than an interval between the
two rotary bodies disposed on the first pulley, and an interval
between the two rotary bodies disposed on the second pulley is set
to be narrower than twice a width dimension of the rotary body.
14. The bending apparatus according to claim 12, wherein by
changing a diametrical dimension of the first pulley and a
diametrical dimension of the second pulley, or by changing a
diametrical dimension of a rotary body disposed on the first pulley
and a diametrical dimension of a rotary body disposed on the second
pulley, a diametrical dimension of pulling members that are wound
around the respective pulleys is changed.
15. The bending apparatus according to claim 1, wherein a rotary
shaft of the pulley and a rotary shaft of the motor are disposed
inside the grasping portion in a coaxial or parallel positional
relationship with respect to the longitudinal axis of the grasping
portion.
16. The bending apparatus according to claim 15, wherein; as wire
travel path changing members that change a travel path of a pulling
member that is guided into the operation portion along the
longitudinal axis of the grasping portion, a pulley lead-in member
that guides the pulling member substantially perpendicularly with
respect to the rotary shaft of the pulley, and a pulley lead-out
member that, after the pulling member is wound around a rotary body
arranged on the pulley, changes a travel path of the pulling member
that is led out from the rotary body in a substantially
perpendicular manner with respect to the rotary shaft of the pulley
to guide the pulling member to the attachment path setting member
are provided.
17. The bending apparatus according to claim 16, wherein; the
pulley lead-in member and the pulley lead-out member are provided
in plurality in correspondence with a plurality of pulling members,
respectively; and the plurality of pulley lead-in members and the
plurality of pulley lead-out members are disposed at predetermined
positions inside the operation portion in a state in which the
plurality of pulley lead-in members and the plurality of pulley
lead-out members are pivotably assembled on a support body.
18. The bending apparatus according to claim 17, wherein the
plurality of pulley lead-in members and the plurality of pulley
lead-out members that are respectively disposed on the support body
are disposed at facing positions such that the pulley is interposed
therebetween, a plurality of attachment path setting members are
disposed on the support body and rotate using the support body as a
rotary shaft, and the rotary shaft of the support body is disposed
at a position that intersects with a longitudinal axis of the
operation element.
19. The bending apparatus according to claim 18, wherein; with
respect to the plurality of pulley lead-in members or the plurality
of pulley lead-out members, or both the plurality of pulley lead-in
members and the plurality of pulley lead-out members, a plurality
of guide rollers having different diameters that rotate around a
center of a same rotary shaft are configured so as to be arranged
in order from a short diameter to a large diameter along the rotary
shaft; and a travel direction of the plurality of pulling members
is changed by winding the plurality of pulling members around the
guide rollers that are arranged along the rotary shaft.
20. The bending apparatus according to claim 16, wherein; the
pulley lead-in member and the pulley lead-out member are provided
in plurality in correspondence with a plurality of pulling members;
and the plurality of pulley lead-in members and the plurality of
pulley lead-out members are individually disposed such that
respective positions thereof are deviated from each other in a
circumferential direction with respect to an outer circumferential
face of the pulley, and a plurality of the attachment path setting
members are disposed in a pivotably assembled state on a support
body.
21. The bending apparatus according to claim 20, wherein; the
support body on which the plurality of attachment path setting
members are disposed is disposed in an intersecting positional
relationship with respect to a longitudinal axis of the operation
portion and at a position such that a center of the support body
intersects with a longitudinal axis of the operation element; and
among the plurality of attachment path setting members disposed on
the support body, a diametrical dimension or a width dimension of a
predetermined attachment path setting member that is disposed at an
end side of the support body is set to be greater than a
diametrical dimension or a width dimension of an attachment path
setting member that is disposed on an inner side thereof.
22. The bending apparatus according to claim 1, wherein; the pulley
is disposed inside the operation portion body at a position that is
further on a proximal end side than the operation element in a
positional relationship such that a longitudinal axis of the pulley
intersects with the longitudinal axis of the grasping portion; the
motor is arranged such that a drive shaft of the motor is disposed
parallel or perpendicular to the longitudinal axis of the pulley;
and the attachment path setting member is disposed in a vicinity of
the pulley; the bending apparatus further comprising: driving force
transmitting means that is provided in the motor and the pulley,
and that transmits rotation of the motor to the pulley; a first
travel path changing member that leads a travel path of a pulling
member that is guided into the operation portion to a vicinity of
an axial extension line of the operation element that is an
opposite direction to the operation element such that the
longitudinal axis of the grasping portion is interposed
therebetween; and a pulley lead-in member that is disposed in a
vicinity of the pulley, and that guides the pulling member that is
led out from the first travel path changing member to the
pulley.
23. The bending apparatus according to claim 1, wherein; a hanging
frame that includes a plurality of frames in which an attachment
portion to which a proximal end portion of a pulling member is
fixedly attached is provided at an end portion is configured in a
cruciform shape comprising four frames; the bending apparatus
further comprising, at respective end portions of two frames that
are disposed along a longitudinal axis of the operation portion,
distal end curved portions that are curved in different directions
so as to interpose a center line therebetween.
24. The bending apparatus according to claim 1, wherein a center of
gravity position of the operation portion is inside the grasping
portion.
25. The bending apparatus according to claim 1, wherein the travel
path changing member is a coil pipe through which the pulling
member can be inserted so as to freely advance and retract.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation application of
PCT/JP2012/053243 filed on Feb. 13, 2012 and claims benefit of
Japanese Application No. 2011-042551 filed in Japan on Feb. 28,
2011, the entire contents of which are incorporated herein by this
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a bending apparatus in
which, by performing a tilt operation that changes a tilt direction
and a tilt angle of an operation element provided in an operation
portion, it is possible to move a pulling member and effect a
bending operation of a bending portion provided in an insertion
portion.
[0004] 2. Description of the Related Art
[0005] In recent years, endoscopes that include an elongated
insertion portion are being utilized in a medical field and an
industrial field. Endoscopes utilized in the medical field are used
to perform observation and the like by inserting the insertion
portion into a body from an oral cavity or an anus or the like.
Further, with an endoscope used in the industrial field, an
observation can be conducted by inserting the insertion portion
into a pipe of a boiler or inside an engine or the like.
[0006] In an endoscope, generally, in order to be able to point an
observation optical system provided in a distal end portion of the
insertion portion in a desired direction, a bending portion that
bends, for example, in the vertical and lateral directions is
provided on a distal end side of the insertion portion. A bending
knob for effecting a bending operation of the bending portion is
pivotably arranged in an operation portion that is provided at a
proximal end of the insertion portion. An angle wire is connected
at a predetermined position of the bending portion and at a
predetermined position of the bending operation knob. In an
endoscope configured in this manner, the configuration is such that
when an operator rotates the bending operation knob clockwise or
counterclockwise using fingers of a hand that is grasping the
operation portion, the angle wire is pulled or slackened and the
bending portion bends. (Hereunder, an endoscope having this
configuration is referred to as a "conventional endoscope.")
[0007] In recent years, endoscopes have been proposed which have
driving means that is provided inside an operation portion of the
endoscope, and in which a bending operation of a bending portion
can be effected by operating an operation element that is a bending
mechanism with a single finger. For example, in FIG. 6 in Japanese
Patent Application Laid-Open Publication No. 08-224241, an
endoscope is illustrated in which a bending pipe is bent vertically
and laterally by operating a joystick that is an operation element
provided in a casing. According to this endoscope, when a surgeon
subjects the joystick to a tilt operation, a controller converts
the tilt operation into a bending angle in a vertical or lateral
direction, and drives a driving actuator for vertical bending
and/or a driving actuator for lateral bending. Thereupon, a wire is
pulled/slackened by the driving force of the actuator and the
bending portion performs a bending operation. Therefore, the
surgeon can easily adjust the bending portion of the distal end
portion.
[0008] However, in an endoscope in which a wire is pulled by a
driving actuator, the wire is not directly pulled by the joystick
that the surgeon operates. Consequently, a change does not occur in
the operability of the joystick even if, during a bending operation
of the bending portion, for example, the distal end portion
contacts against living tissue and a load that is applied to the
wire increases.
[0009] Japanese Patent Application Laid-Open Publication No.
2003-325437 discloses an endoscope that is equipped with a pulling
member operation apparatus with which it is possible to effect a
bending operation of a bending portion by tilting an operation
instruction lever as an operation element using a slight amount of
operation force thereby to directly move a desired pulling member
by a desired amount. In this endoscope, by tilting a bending lever
thereby to change a tension state of an operation wire that
corresponds to the tilt operation direction that is fixed to an arm
member, a drag between the operation wire and a pulley that is
being rotated by a motor is changed. Thereupon, the operation wire
is moved in the direction of rotation of the pulley and the bending
portion bends. According to this endoscope, the relevant wire is
directly pulled when a tilt operation of the bending lever is
performed. As a result, operability is obtained such that, for
example, when the distal end portion contacts against living tissue
during a bending operation, the amount of tilt operation force
increases along with an increase in a load that is applied to the
relevant wire, and thus the above described problem can be
solved.
[0010] In addition, Japanese Patent Application Laid-Open
Publication No. 2010-207598 discloses an endoscope equipped with
the pulling member operation apparatus described in Japanese Patent
Application Laid-Open Publication No. 2003-325437. An operation
portion of this endoscope includes an operation portion body, and a
grasping portion that is provided on a side opposite to an
insertion portion of the operation portion body so that an axis
direction intersects with an insertion axis of the insertion
portion and inclines downward relative to the insertion axis. When
the grasping portion is grasped with the little finger, the ring
finger, and the middle finger, a bending operation lever of this
endoscope protrudes from a middle position on a front surface side
of the operation portion body that is a position at which an
operation can be performed with the thumb. Further, in this
endoscope, a plurality of operation switches are disposed on a
front surface side of the operation portion body on the grasping
portion side that is in the vicinity of the bending operation
lever.
SUMMARY OF THE INVENTION
[0011] According to one aspect of the present invention, a bending
apparatus includes: a bending portion; a grasping portion that is
included in an operation portion and has a longitudinal axis, and
that is grasped when effecting a bending operation of the bending
portion; an operation element that is erected vertically from the
operation portion, and that has a shaft portion in which a tilt
direction and a tilt angle are changeable; a pulling member having
one end connected to the bending portion; a pulley that is disposed
at a position that is deviated in the longitudinal axis direction
relative to the operation element, and on which a rotary body
around which an intermediate portion of the pulling member is wound
is arranged in a loosely fitting state; a motor that is disposed at
a position that is deviated in the longitudinal axis direction
relative to the operation element, and that generates a driving
force that rotates the pulley to pull the pulling member that is
wound around the rotary body arranged on the pulley in a winding
direction; a hanging frame that extends in a diameter direction of
the shaft portion of the operation element, and that includes an
attachment portion to which the other end of the pulling member
that is wound around the rotary body is attached; and an attachment
path setting member that is provided inside the operation portion
and that leads the pulling member that is wound around the rotary
body in the longitudinal axis direction, and changes a path of the
pulling member that is led to a direction of a longitudinal axis of
the shaft portion to guide the pulling member to the attachment
portion.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 to FIG. 5 relate to a first embodiment of the present
invention, in which:
[0013] FIG. 1 is a view that illustrates an endoscope in which an
operation element included in a pulling member operation apparatus
is erected vertically in an operation portion;
[0014] FIG. 2 is a view that illustrates a configuration of a
pulling member operation apparatus that contains a motor and a
pulley in an operation portion that includes a grasping portion and
an operation portion body;
[0015] FIG. 3 is a view that illustrates a rotary body;
[0016] FIG. 4 is a view that mainly illustrates a configuration of
the motor and the pulley of the pulling member operation apparatus
as viewed from an arrow Y4 direction in FIG. 2; and
[0017] FIG. 5 is a view that mainly illustrates a configuration of
an attachment path setting member and a hanging frame of the
pulling member operation apparatus as viewed from the arrow Y4
direction in FIG. 2.
[0018] FIG. 6 to FIG. 9 relate to an application example of the
present invention, in which:
[0019] FIG. 6 is a view that illustrates a pulling member operation
apparatus that includes two pulleys that are arranged on two pulley
shafts that are provided in a perpendicular positional relationship
with respect to a motor shaft, and a driving force transmitting
mechanism portion that transmits a driving force of the motor to
the two pulleys;
[0020] FIG. 7 is a view that illustrates a relation between the two
pulleys and a plurality of guide rollers as viewed from an arrow Y7
direction in FIG. 6;
[0021] FIG. 8 is a view that illustrates a different relation
between a plurality of guide rollers, two pulleys, and rotary
bodies; and
[0022] FIG. 9 is a view that illustrates a relation between rotary
bodies that are disposed on two pulleys and guide rollers as viewed
from an arrow Y9 direction in FIG. 8.
[0023] FIG. 10 to FIG. 15 relate to a second embodiment of the
present invention, in which:
[0024] FIG. 10 is a view that illustrates another configuration of
a pulling member operation apparatus that contains a motor and a
pulley in an operation portion that includes a grasping portion and
an operation portion body;
[0025] FIG. 11 is a view that illustrates the pulling member
operation apparatus as viewed from an arrow Y11 direction in FIG.
10;
[0026] FIG. 12 is a view that illustrates a configuration example
of a second guide roller, a third guide roller, and a plurality of
rotary bodies disposed on a pulley as viewed from the direction of
a line indicated by arrows Y12-Y12 in FIG. 10;
[0027] FIG. 13 is a view that illustrates a configuration example
of a plurality of second guide rollers, a plurality of third guide
rollers, and a plurality of rotary bodies disposed on a pulley as
viewed from the direction of a line indicated by arrows Y13-Y13 in
FIG. 10, that is a modification example of the arrangement
positions of guide rollers;
[0028] FIG. 14 is a view that illustrates a pulley having a
configuration that includes a plurality of shaft bodies, that is a
modification example of a pulley; and
[0029] FIG. 15 is a view that illustrates the pulley as viewed from
the direction of a line indicated by arrows Y15-Y15 in FIG. 14.
[0030] FIG. 16 to FIG. 24 relate to a third embodiment of the
present invention, in which:
[0031] FIG. 16 is a view that illustrates an operation portion that
includes a pulling member operation apparatus in which a motor
having a motor shaft that is disposed so as to be orthogonal to a
longitudinal axis of the operation portion, and a pulley having a
pulley shaft that is disposed so as to be orthogonal to the
longitudinal axis are contained in an operation portion body;
[0032] FIG. 17 is a view that illustrates the pulling member
operation apparatus that is provided inside the operation portion
body;
[0033] FIG. 18 is a perspective view that illustrates the
configuration of the pulling member operation apparatus;
[0034] FIG. 19 is a top view of the pulling member operation
apparatus illustrated in FIG. 18;
[0035] FIG. 20 is a side view of the pulling member operation
apparatus illustrated in FIG. 18;
[0036] FIG. 21 is a top view of a pulling member operation
apparatus in which the arrangement positions of the guide rollers
are different;
[0037] FIG. 22 is a side view of the pulling member operation
apparatus illustrated in FIG. 21;
[0038] FIG. 23 is a top view of a pulling member operation
apparatus in which coil pipes are used as travel path changing
members; and
[0039] FIG. 24 is a side view of the pulling member operation
apparatus shown in FIG. 23.
[0040] FIG. 25 is a view that illustrates a configuration example
of a pulling member operation apparatus that is disposed inside a
connector that is provided in a proximal end portion of a universal
cord in which a pulley and a motor are outside an operation
portion.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0041] Hereunder, embodiments of the present invention are
described with reference to the drawings.
[0042] A first embodiment will now be described referring to FIG. 1
to FIG. 5.
[0043] As shown in FIG. 1, an endoscope 1 of the present embodiment
includes an elongated insertion portion 2, an operation portion 3
that is connected in series to a proximal end of the insertion
portion 2, and a universal cord 4 that extends from a side portion
of the operation portion 3.
[0044] The insertion portion 2 includes a distal end portion 2a, a
bending portion 2b, and a flexible tube portion 2c that are
connected in series in that order from the distal end side. An
image pickup apparatus (unshown) that includes an image pickup
device is contained inside the distal end portion 2a. The bending
portion 2b is configured to be capable of bending in, for example,
the vertical and lateral directions. The flexible tube portion 2c
is long and has flexibility.
[0045] As shown in FIG. 1 and FIG. 2, the operation portion 3
includes a grasping portion 3a and an operation portion body 3b.
The grasping portion 3a is connected in series to the insertion
portion 2, and the operation portion body 3b is connected in series
to the grasping portion 3a. The longitudinal axis of the grasping
portion 3a and the insertion axis of the insertion portion 2 are in
a coaxial or a parallel positional relationship with each other. An
operation element 5 configured to cause the bending portion 2b to
perform a bending operation is provided at a position corresponding
to a portion at which the largest amount of vacant space exists on
the distal end side of the operation portion body 3b. The
longitudinal axis of the operation portion body 3b (also referred
to as "longitudinal axis of the operation portion 3") and the
longitudinal axis of the grasping portion 3a are in a coaxial or a
parallel positional relationship with each other.
[0046] The operation element 5 is provided in a manner that
intersects with the longitudinal axis of the operation portion 3
from an operation element protrusion port (unshown) that is an
opening provided in one face of the operation portion body 3b.
[0047] The bending portion 2b is configured so as to bend in
accordance with a tilt operation that includes a tilt direction and
a tilt angle of the operation element 5, as shown by the arrows Yu,
Yd, Yl, and Yr in FIG. 1. More specifically, in accordance with a
tilting operation of the operation element 5, a bending operation
wire (hereunder, abbreviated to "bending wire") that is described
later is pulled/slackened and the bending portion 2b bends in the
upward direction, the right direction, the downward direction, the
left direction, a direction between the upward direction and the
right direction, or the like.
[0048] In the present embodiment, the bending portion 2b is
configured to bend in the four directions of upward, downward, left
and right. However, the bending portion 2b may be configured to
bend only in the upward and downward directions. The aforementioned
reference characters "u," "d," "l" and "r" denote the upward,
downward, left and right directions that are the bending directions
of the bending portion 2b. In the following description, for
example, reference symbol "8u" denotes a wire for upward bending,
and reference symbol "9d" denotes a rotary body for the downward
direction. Further, in the drawings, to distinguish the small
letter "l" from the number "1", small letter "l" is shown in
cursive style.
[0049] In this connection, as shown in FIG. 1, a switch 6a, an
air/water supply button 6b, and a suction button 6c are provided at
predetermined positions on the exterior of the operation portion
body 3b, in addition to the operation element 5. The switch 6a is
operated, for example, to input an instruction to perform various
kinds of image pickup operations of the image pickup apparatus
provided inside the distal end portion 2a. Further, a channel
insertion port 6d that communicates with a treatment instrument
channel (unshown) is provided on the exterior of the grasping
portion 3a.
[0050] In the present embodiment, the operation element 5 is
provided at a position at which the operation element 5 is operated
by a thumb of the hand which grasps the operation portion 3 in a
case where the operator grasps the grasping portion 3a of the
operation portion 3 with the left hand in the same manner as for a
conventional endoscope, the air/water supply button 6b and the
suction button 6c are provided at positions at which the air/water
supply button 6b and the suction button 6c are operated by fingers
other than the thumb of the hand with which the operator grasps the
operation portion 3, and the switch 6a is provided at a position at
which the switch 6a can be operated by the thumb or another finger
of the hand with which the operator grasps the operation portion
3.
[0051] Reference numeral 7 in FIG. 1 and FIG. 2 denotes a cover
member. The cover member 7 blocks the operation element protrusion
port in a watertight state, and adheres to a shaft portion 5a to
retain the operation element 5 in a manner that enables a tilt
operation thereof.
[0052] A signal cable, an electric wire, a light guide fiber
bundle, an air supply tube, a water supply tube, a suction tube and
the like are inserted through the inside of the universal cord 4.
The signal cable is connected to the image pickup apparatus. The
electric wire supplies electric power to a motor that is described
later (see reference numeral 12 in FIG. 2). The light guide fiber
bundle transmits illuminating light of a light source
apparatus.
[0053] As shown in FIG. 2, a pulling member operation apparatus 10
is provided inside the operation portion 3. As shown in FIG. 2 to
FIG. 5, the pulling member operation apparatus 10 is mainly
constituted by four bending wires 8, an elongated pulley 11 on
which four rotary bodies 9 are arranged, a motor 12 that is driving
means, a substantially cruciform shaped hanging frame 13, the
operation element 5, and a guide roller set 21 that includes a
plurality of guide rollers that is described later. The bending
wires 8 are pulling members. An intermediate portion of each wire 8
is wound around each rotary body 9, respectively. The motor 12 has
a driving force that causes a predetermined rotary body 9 arranged
on the pulley 11 to rotate with a predetermined torque at the time
of a bending operation. The hanging frame 13 has wire attachment
portions to which the proximal end portions of the respective wires
8 are respectively connected. The shaft portion 5a of the operation
element 5 is integrally connected to the hanging frame 13. The
plurality of guide rollers of the guide roller set 21 are wire
travel path changing members that change a travel path of the four
wires 8 inside the operation portion 3.
[0054] In FIG. 4, reference numeral 51 denotes a signal cable,
reference numeral 52 denotes a light guide cable, reference numeral
53 denotes a coil pipe stopper, and reference numeral 59 denotes a
partition plate. The present embodiment is configured so that the
center of gravity of the operation portion 3 is positioned inside
the grasping portion 3a.
[0055] The four bending wires 8 include a pair of a wire for upward
bending (hereunder, referred to as "upward bending wire") 8u and a
wire for downward bending (hereunder, referred to as "downward
bending wire") 8d that are used for bending operations in the
upward and downward directions, and a pair of a wire for left
bending (hereunder, referred to as "left bending wire") 8l and a
wire for right bending (hereunder, referred to as "right bending
wire") 8r that are used for bending operations in the left and
right directions.
[0056] In the present embodiment, the longitudinal axis of the
pulley 11 and the longitudinal axis of the motor 12 intersect. More
specifically, a drive shaft of the motor 12 is disposed at a
predetermined position inside the grasping portion 3a so as to be
in a parallel positional relationship with respect to the
longitudinal axis of the grasping portion 3a. A motor shaft 12b of
the motor 12 and a pulley shaft 11b that is a rotary shaft of the
pulley 11 are set so as to be disposed in a perpendicular
positional relationship with each other. The pulley 11 and the
motor 12 are disposed in respectively different spaces inside the
operation portion 3 that is partitioned by the partition plate 59,
in a manner that interposes the partition plate 59
therebetween.
[0057] The configuration is such that a driving force of the motor
12 is transmitted to the pulley 11 by a driving force transmitting
mechanism portion 30. The driving force transmitting mechanism
portion 30 includes a first bevel gear 31 and a second bevel gear
32.
[0058] The first bevel gear 31 is integrally fixed to the shaft
portion 12a of the motor 12. The second bevel gear 32 is integrally
fixed to the shaft portion 11a of the pulley 11. According to this
configuration, the pulley 11 is rotated around its axis when the
driving force of the motor 12 is transmitted to the shaft portion
11a through the bevel gears 31 and 32.
[0059] The rotary body 9 is elastically deformable. As shown in
FIG. 3, the rotary body 9 includes, for example, an annular portion
9a and a rotation amount adjustment portion 9b. A gap 9c is formed
in the annular portion 9a of the rotary body 9. An unshown wire
guide portion is formed in the annular portion 9a and the rotation
amount adjustment portion 9b. The wire guide portion is configured
in a predetermined shape so as to smoothly guide the relevant wire
8 from a winding start position 9s to a winding end position 9e.
Four rotary bodies 9u, 9d, 9l, and 9r are disposed in a
predetermined loosely fitting state on the outer circumferential
face of the pulley 11, and each of the rotary bodies 9u, 9d, 9l,
and 9r rotates independently.
[0060] The hanging frame 13 shown in FIG. 5 is disposed so as to be
in a predetermined positional relationship within a vacant space on
the distal end side of the operation portion body 3b shown in FIG.
2.
[0061] As shown in FIG. 5, the hanging frame 13 includes four
frames 13u, 13d, 13l, and 13r, and is formed in a substantially
cruciform shape. A frame for an upward direction (hereunder,
referred to as "upward frame") 13u and a frame for a downward
direction (hereunder, referred to as "downward frame") 13d that
correspond to the pair of bending wires 8u and 8d are collinearly
disposed in a manner that interposes the shaft portion 5a
therebetween. An upward wire attachment portion 13u2 is provided at
an end portion of the upward frame 13u, and a downward wire
attachment portion 13d2 is provided at an end portion of the
downward frame 13d.
[0062] In addition, a frame for a left direction (hereunder,
referred to as "left frame") 13l and a frame for a right direction
(hereunder, referred to as "right frame") 13r that correspond to
the pair of bending wires 8l and 8r are collinearly disposed in a
perpendicular manner with respect to an upward/downward frame
center line (hereunder, referred to as "frame center line") 13a in
a manner that interposes the shaft portion 5a therebetween. A left
wire attachment portion 13l2 is provided at an end portion of the
left frame 13l, and a right wire attachment portion 13r2 is
provided at an end portion of the right frame 13r.
[0063] The upward frame 13u includes, at an end portion thereof, an
upward frame distal end curved portion 13ub that is curved in one
direction relative to the frame center line 13a. The downward frame
13d includes, at an end portion thereof, a downward frame distal
end curved portion 13db that is curved in one direction relative to
the frame center line 13a.
[0064] The upward wire attachment portion 13u2 is provided in the
upward frame distal end curved portion 13ub, and the downward wire
attachment portion 13d2 is provided in the downward frame distal
end curved portion 13db. As a result, an interval w1 in a direction
that is orthogonal to the longitudinal axis of the operation
portion 3 between the upward wire attachment portion 13u2 and the
downward wire attachment portion 13d2 is set to a predetermined
size.
[0065] In this connection, the upward frame 13u and the upward wire
attachment portion 13u2 and the like are components that are set by
taking into consideration the tilt directions of the operation
element 5 and the bending directions of the bending portion 2b.
According to the present embodiment, a configuration is adopted
such that when the operation element 5 is tilted in the arrow Yu
direction in FIG. 1, the upward wire attachment portion 13u2 sways
and is tilted in the arrow Yu direction in FIG. 5 and the bending
portion 2b bends in the upward direction. Similarly, when the
operation element 5 is tilted in the arrow Yd direction in FIG. 1,
the downward wire attachment portion 13d2 sways and is tilted in
the arrow Yd direction in FIG. 5 and the bending portion 2b bends
in the downward direction. Further, when the operation element 5 is
tilted in the arrow Yl direction in FIG. 1, the left wire
attachment portion 13l2 sways and is tilted in the arrow Yl
direction in FIG. 5 and the bending portion 2b bends in the left
direction. Similarly, when the operation element 5 is tilted in the
arrow Yr direction in FIG. 1, the right wire attachment portion
13r2 sways and is tilted in the arrow Yr direction in FIG. 5 and
the bending portion 2b bends in the right direction.
[0066] In the present embodiment, the hanging frame 13 is disposed
at a predetermined position inside the operation portion 3 so that
the frame center line 13a and the longitudinal axis of the grasping
portion 3a are parallel.
[0067] As shown in FIG. 2 and FIG. 5, the guide roller set 21
includes a roller shaft 21p and four guide rollers 21u, 21d, 21l,
and 21r. The roller shaft 21p is a support body that is, for
example, a cylindrical shape. The four guide rollers 21u, 21d, 21l,
and 21r are pivotably disposed on the roller shaft 21p.
[0068] The four guide rollers 21u, 21d, 21l, and 21r correspond to
the four bending wires 8u, 8d, 8l, and 8r, respectively. The four
guide rollers 21u, 21d, 21l, and 21r are provided at positions that
are separated by a predetermined distance from the pulley 11 and
the hanging frame 13. The four guide rollers 21u, 21d, 21l and 21r
are attachment path setting members that guide the four bending
wires 8u, 8d, 8l, and 8r to the wire attachment portions 13u2,
13d2, 13l2, and 13r2 of the hanging frame 13.
[0069] The roller shaft 21p is disposed at a predetermined position
directly below the shaft portion 5a, in an intersecting positional
relationship with respect to the longitudinal axis of the grasping
portion 3a. The center of the roller shaft 21p is positioned on the
central axis of the shaft portion 5a in an upright state.
[0070] The respective bending wires 8u, 8d, 8l and 8r are
configured so as to arrive at the upward wire attachment portion
13u2, the downward wire attachment portion 13d2, the left wire
attachment portion 13l2 and the right wire attachment portion 13r2
of the hanging frame 13, respectively, after the respective travel
paths of the bending wires 8u, 8d, 8l and 8r have been changed by
the guide rollers 21u, 21d, 21l and 21r.
[0071] The guide rollers 21 will now be described referring to FIG.
5.
[0072] In this connection, in FIG. 5, in order to describe the
positional relation between the respective bending wires 8u, 8d, 8l
and 8r and the respective wire attachment portions 13u2, 13d2, 13l2
and 13r2, the position of the hanging frame 13 is displaced in the
right direction in the drawing with respect to the roller shaft
21p.
[0073] As shown in FIG. 5, the four guide rollers 21u, 21d, 21l and
21r are disposed in the order of guide rollers 21r, 21d, 21u and
21l as shown by the arrow Y5a in FIG. 5 with respect to the roller
shaft 21p.
[0074] There is a difference in the diametrical dimensions or width
dimensions between the guide rollers 21r and 21l disposed at the
two ends of the roller shaft 21p and the guide rollers 21u and 21d
disposed on the inner side of the guide rollers 21r and 21l in a
manner that interposes the center of the roller shaft 21p
therebetween. At least the width dimensions of the guide rollers
21l and 21r are set so as to be wider than the width dimensions of
the guide rollers 21u and 21d.
[0075] When the maximum external diameter of the guide rollers 21l,
21r, 21u and 21d is taken as w3 and an interval in the longitudinal
axis direction of the operation portion 3 between the upward wire
attachment portion 13u2 and the downward wire attachment portion
13d2 is taken as w2, the relation w2>w3 is set with respect to
the interval w2 and the maximum external diameter w3.
[0076] Further, an interval between the center of the guide roller
21u and the center of the guide roller 21d is set to an interval w1
that is an interval between the upward wire attachment portion 13u2
and the downward wire attachment portion 13d2.
[0077] In addition, a relation w4>w5 is set with respect to an
interval w4 between the left wire attachment portion 13l2 and the
right wire attachment portion 13r2, and an interval w5 between an
outer end of the left guide roller 21l disposed on the roller shaft
21p and an outer end of the right guide roller 21r disposed on the
roller shaft 21p.
[0078] The four rotary bodies 9 disposed on the pulley 11 are
disposed in the order of rotary bodies 9r, 9d, 9u and 9l as shown
by the arrow Y4a in FIG. 4.
[0079] The travel paths inside the operation portion 3 of the
respective bending wires 8u, 8d, 8l and 8r will now be described
referring to FIG. 2, FIG. 4 and FIG. 5.
[0080] As shown in FIG. 5, the respective proximal end portions of
the four bending wires 8u, 8d, 8l and 8r are fixed to the wire
attachment portions 13u2, 13d2, 13l2 and 13r2 that are at
predetermined positions of the hanging frame 13.
[0081] On the other hand, the respective distal end portions of the
bending wires 8u, 8d, 8l and 8r are fixed at positions
corresponding to up, down, left and right of unshown distal end
bending pieces that are included in the bending portion 2b. The
distal end bending pieces are bending pieces that constitute the
most distal end of a bending portion set that is configured so as
to bend in the vertical and lateral directions, in which a
plurality of unshown bending pieces included in the bending portion
2b are connected in series.
[0082] The respective bending wires 8u, 8d, 8l and 8r are inserted
so as to freely advance and retract inside guides 24 that are
formed, for example, with coil pipes made of metal that have
through-holes that correspond to the wires 8u, 8d, 8l and 8r inside
the insertion portion 2, respectively.
[0083] As shown in FIG. 2, FIG. 4 and FIG. 5, the respective
bending wires 8u, 8d, 8l and 8r that are fixed to the distal end
bending pieces extend inside the operation portion 3 through the
guides 24.
[0084] The respective bending wires 8u, 8d, 8l and 8r are wound
around the rotary bodies 9u, 9d, 9l and 9r disposed on the pulley
11, respectively. More specifically, each of the bending wires 8u,
8d, 8l and 8r are wound around the rotary bodies 9u, 9d, 9l and 9r
so as to be in a predetermined slackened state from the respective
winding start positions 9s of the corresponding rotary body 9u, 9d,
9l or 9r. Thereafter, the respective bending wires 8u, 8d, 8l and
8r are led towards the respective guide rollers 21u, 21d, 21l and
21r from the respective winding end positions 9e of the rotary
bodies 9u, 9d, 9l and 9r.
[0085] The respective bending wires 8u, 8d, 8l and 8r that are led
from the respective rotary bodies 9u, 9d, 9l and 9r are guided to
the respective guide rollers 21u, 21d, 21l and 21r, and the wire
travel paths are changed thereby so that the bending wires 8u, 8d,
8l and 8r are guided to the wire attachment portions 13u2, 13d2,
13l2 and 13r2 provided in the hanging frame 13. The respective
proximal end portions of the bending wires 8u, 8d, 8l and 8r are
fixed to the wire attachment portions 13u2, 13d2, 13l2 and
13r2.
[0086] As described above, the width dimensions of the guide
rollers 21l and 21r are set so as to be wider than the width
dimensions of the guide rollers 21u and 21d, and the interval w4 is
set so as to be greater than the interval w5. As a result, the
bending wires 8l and 8r pass smoothly through the guide rollers 21l
and 21r and are guided to the wire attachment portions 13l2 and
13r2.
[0087] In this connection, the shaft portion 5a of the operation
element 5 and a frame convex portion 13f that is a central shaft of
the hanging frame 13 are coaxially mounted and fixed through a
pivotably arranged universal joint 14 to an unshown frame. When the
shaft portion 5a of the operation element 5 is in an upright state
as shown in FIG. 2, the respective bending wires 8u, 8d, 8l and 8r
that extend from the guide rollers 21u, 21d, 21l and 21r towards
the hanging frame 13 are all in a predetermined slackened
state.
[0088] Reference symbol 5b denotes a finger contact portion that is
a spherical shape. The finger contact portion 5b is integrally
fixed to a distal end of the shaft portion 5a.
[0089] A configuration may also be adopted in which a partition
member is provided between adjacent bending wires 8, to thereby
prevent the bending wires 8 from tangling together.
[0090] Thus, in the configuration in which the pulley 11 and the
motor 12 are disposed inside the operation portion 3 having a
longitudinal axis that is parallel to the longitudinal axis of the
insertion portion 2 included in the endoscope 1, the motor shaft
12b of the motor 12 is disposed parallel to the longitudinal axis
of the grasping portion 3a, and the pulley shaft 11b of the pulley
11 is made orthogonal to the motor shaft 12b of the motor 12.
[0091] In addition, the guide roller set 21 having the roller shaft
21p that intersects at right angles with the longitudinal axis of
the operation portion 3, in other words, that is parallel to the
pulley shaft 11b, is disposed at a predetermined position as a wire
travel path changing member.
[0092] Further, the respective bending wires 8u, 8d, 8l and 8r that
are led inside the operation portion 3 and travel towards the
proximal end side of the operation portion 3 are wound around the
respective rotary bodies 9u, 9d, 9l and 9r disposed on the pulley
11 from the respective winding start positions 9s. The respective
bending wires 8u, 8d, 8l and 8r are wound around the respective
rotary bodies 9u, 9d, 9l and 9r in a slackened state and led out
from the respective winding end positions. The bending wires 8u,
8d, 8l and 8r that are led out are guided towards the guide rollers
21u, 21d, 21l and 21r. Thereafter, the travel path of the bending
wires 8u, 8d, 8l and 8r is changed by the guide rollers 21u, 21d,
21l and 21r, respectively, and the bending wires 8u, 8d, 8l and 8r
are led to the wire attachment portions 13u2, 13d2, 13l2 and 13r2
of the hanging frame 13 and fixed thereto.
[0093] According to the endoscope 1 configured in the above manner,
in a state in which the motor 12 is driven and the pulley 11 is
rotated, when the shaft portion 5a of the operation element 5 is in
an upright state each of the bending wires 8u, 8d, 8l and 8r that
are wound around the rotary bodies 9u, 9d, 9l and 9r disposed on
the pulley 11, respectively, enters a predetermined slackened
state. As a result, all of the rotary bodies 9u, 9d, 9l and 9r
enter a sliding state with respect to the pulley 11, and the
bending portion 2b is maintained in a straight state.
[0094] On the other hand, in a state in which the operator has
grasped the grasping portion 3a, to cause the bending portion 2b to
perform a bending operation in, for example, the upward direction,
the operator places the ball of the thumb on the finger contact
portion 5b of the operation element 5 and tilts the shaft portion
5a in the direction of the arrow Yu in FIG. 1. Thereupon,
accompanying the operation to tilt the operation element 5, the
hanging frame 13 inclines, and the upward bending wire 8u fixed to
the upward wire attachment portion 13u2 gradually changes from a
slackened state to a tensed state. In contrast, the other bending
wires 8d, 8l and 8r change to a state in which the bending wires
8d, 8l and 8r are more slackened.
[0095] Accordingly, among the respective bending wires 8u, 8d, 8l
and 8r that were wound in a slackened state around the respective
rotary bodies 9u, 9d, 9l and 9r of the pulley 11, only the upward
bending wire 8u is pulled. Thereupon, the gap 9c in a rotary body
for upward bending (hereunder, referred to as "upward rotary body")
9u is narrowed in resistance to an elastic force and is thus
contracted, and the state changes to one in which the upward rotary
body 9u and the pulley 11 are in a closely contacting state.
Consequently, frictional resistance arises between the upward
rotary body 9u and the pulley 11, and the upward rotary body 9u is
rotated while sliding with respect to the pulley 11 in the same
direction as the pulley 11. As a result, the upward bending wire 8u
that is disposed further on the insertion portion 2 side than the
upward rotary body 9u is pulled and moved accompanying rotation of
the upward rotary body 9u, and the bending portion 2b starts a
bending movement in the upward direction.
[0096] In this case, if the operator continues the operation to
tilt the shaft portion 5a in the same direction so as to cause the
upward rotary body 9u to closely contact the pulley 11, the upward
rotary body 9u that is in the closely contacting state is brought
into even closer contact with the pulley 11 and the frictional
force increases. As a result, the wire for upward bending 8u that
is disposed at a position that is further on the insertion portion
2 side than the upward rotary body 9u is pulled and moved to a
further degree accompanying rotation of the rotary body 9u, and
thus the bending portion 2b bends further in the upward
direction.
[0097] In contrast, if the operator continues to maintain the tilt
position of the operation element 5, the tightness between the
upward rotary body 9u and the pulley 11 is maintained. Thus,
movement stops in a state in which a tensile force has arisen at
the upward bending wire 8u disposed at a position that is further
on the distal end side than the upward rotary body 9u.
[0098] At this time, each of the bending wires 8d, 8l and 8r is in
a slackened state. Accordingly, by continuing to retain the
operation element 5 in this tilt operation state, the tensed state
of the upward bending wire 8u and the slackened states of the
bending wires 8d, 8l and 8r are retained, respectively, and the
bending portion 2b is maintained in a bent state that corresponds
to the tilt operation.
[0099] Subsequently, the operator performs a tilt operation with
respect to the operation element 5 to bend the bending portion 2b
further in the same direction, to bend the bending portion 2b in
another direction, or to return the bending portion 2b to the
original state thereof. Thereupon, the bending wires 8u, 8d, 8l and
8r are pulled or slackened in accordance with the tilt operation, a
change arises in the loosely fitting state or the closely
contacting state of the pulley 11 and the rotary bodies 9 that
correspond to the bending wires 8, and the bending portion 2b
changes to a state that corresponds to the tilt operation of the
operation element 5.
[0100] According to this configuration, the end portions of the
respective bending wires 8u, 8d, 8l and 8r are fixed to the wire
attachment portions 13u2, 13d2, 13l2 and 13r2 of the hanging frame
13 that is fixed to the shaft portion 5a of the operation element
5, by using the guide roller set 21 to change the wire travel paths
of the respective bending wires 8u, 8d, 8l and 8r that are led
inside the operation portion 3. As a result, the respective bending
wires 8u, 8d, 8l and 8r can be smoothly pulled or slackened by a
tilt operation of the operation element 5.
[0101] Further, in a state in which the operator has grasped the
operation portion 3, that is, during endoscopy, the operator can
easily operate not just the operation element 5, but also the
air/water supply button 6b, the suction button 6c and the switch
6a.
[0102] An application example of the present invention will now be
described referring to FIG. 6 to FIG. 9.
[0103] FIG. 6 is a view that illustrates the configuration of a
pulling member operation apparatus including pulleys that are
provided in a perpendicular positional relationship with respect to
a motor shaft. FIG. 7 is a view that illustrates a relation between
a plurality of guide rollers, two pulleys, and rotary bodies as
viewed from an arrow Y7 direction in FIG. 6. FIG. 8 is a view that
illustrates a different relation between a plurality of guide
rollers, two pulleys, and rotary bodies. FIG. 9 is a view that
illustrates guide rollers and rotary bodies as viewed from an arrow
Y9 direction in FIG. 8.
[0104] As shown in FIG. 6 and FIG. 7, a pulling member operation
apparatus 10A of the present embodiment includes two pulleys 11A1
and 11A2, a driving force transmitting mechanism portion 30A, the
four bending wires 8, the four rotary bodies 9, the motor 12, the
hanging frame 13 (not shown in FIG. 6 and FIG. 7) and the operation
element 5 (not shown in FIG. 6 and FIG. 7) that are described
above, and a plurality of guide roller sets 21, 22 and 23. The
first pulley 11A1 and the second pulley 11A2 are disposed at
predetermined positions in a parallel positional relationship with
each other. The travel paths of the respective bending wires 8u,
8d, 8l and 8r are changed by the plurality of guide roller sets 21,
22 and 23. The plurality of guide roller sets 21, 22 and 23 each
include wire travel path changing members.
[0105] In this connection, a first guide roller set 21 is an
attachment path setting member that includes the above described
guide rollers 21u, 21d, 21l and 21r as first wire travel path
changing members, and is not shown in FIG. 6 and FIG. 7. A second
guide roller set 22 includes second guide rollers 22u, 22d, 22l and
22r, described later, as second wire travel path changing members.
A third guide roller set 23 includes third guide rollers 23u, 23d,
23l and 23r, described later, as third wire travel path changing
members.
[0106] In the present embodiment, the guide rollers 21u, 21d, 21l
and 21r are the first guide rollers 21u, 21d, 21l and 21r.
[0107] Reference numerals 54 and 55 denote pulley shafts, and
reference numerals 56a, 56b, 57a and 57b denote roller shafts.
[0108] In the present embodiment also, a configuration is adopted
so that the center of gravity of the operation portion 3 is
positioned inside the grasping portion 3a.
[0109] In the present embodiment, the first pulley 11A1 is
pivotably attached to a first pulley shaft 54 that is provided
orthogonal to the longitudinal axis of the grasping portion 3a that
is fixed to the partition plate 59. The second pulley 11A2 is
pivotably attached to a second pulley shaft 55 that is provided
orthogonal to the longitudinal axis of the grasping portion 3a that
is fixed to the partition plate 59. Accordingly, in the present
embodiment, the motor shaft 12b of the motor 12 and the pulley
shafts 54 and 55 are set in a perpendicular positional relationship
with each other. Further, the configuration is such that the
driving force of the motor 12 is transmitted to the pulleys 11A1
and 11A2 by the driving force transmitting mechanism portion
30A.
[0110] The driving force transmitting mechanism portion 30A is a
gear train, and in addition to the first bevel gear 31 and the
second bevel gear 32, includes a first spur gear 33, a second spur
gear 34, and a third spur gear 35. The first bevel gear 31 is fixed
to the shaft portion 12a of the motor 12. The second bevel gear 32
and the first spur gear 33 are fixed to predetermined positions of
a gear shaft 36 that is pivotably supported by the partition plate
59. The second bevel gear 32 is fixed to an end portion of the gear
shaft 36, and intermeshes with the first bevel gear 31. The first
spur gear 33 is fixed to a predetermined position on the other end
portion side of the gear shaft 36. The second spur gear 34 is fixed
to the second pulley 11B, and intermeshes with the first spur gear
33. The third spur gear 35 is fixed to the first pulley 11A, and
intermeshes with the second spur gear 34.
[0111] According to this configuration, similarly to the above
described configuration, the single motor 12 and the two pulleys
11A1 and 11A2 can be disposed in different spaces inside the
operation portion 3, in manner that interposes the partition plate
59 therebetween.
[0112] Further, when the motor 12 enters a driving state, rotation
of the shaft portion 12a of the motor 12 is transmitted to the
first bevel gear 31, the second bevel gear 32, the gear shaft 36,
the first spur gear 33, the second spur gear 34 and the third spur
gear 35, and thus the first pulley 11A1 and the second pulley 11A2
rotate in different directions. More specifically, the first pulley
11A1 shown in FIG. 7 rotates clockwise, and the second pulley 11A2
shown in FIG. 7 rotates counterclockwise.
[0113] As shown in FIG. 6, for example, a rotary body for the left
direction (hereunder, referred to as "left rotary body") 9l and a
rotary body for the right direction (hereunder, referred to as
"right rotary body") 9r are disposed at predetermined positions
with a predetermined interval therebetween on the first pulley
11A1. Further, for example, the upward rotary body 9u and a rotary
body for the downward direction (hereunder, referred to as
"downward rotary body") 9d are disposed at predetermined positions
on the second pulley 11A2 with an interval therebetween that is the
same as the interval between the left rotary body 9l and the right
rotary body 9r.
[0114] As shown in FIG. 7, the winding start position 9s of the
left rotary body 9l and the winding start position 9s of the right
rotary body 9r that are disposed on the first pulley 11A1 are set
on the upper side in the drawing. In contrast, the winding start
position 9s of the upward rotary body 9u and the winding start
position 9s of the downward rotary body 9d that are disposed on the
second pulley 11A2 are set on the lower side in the drawing.
Consequently, the winding direction of the bending wires 8u and 8d
and the winding direction of the bending wires 8l and 8r are
opposite directions to each other.
[0115] As shown in FIG. 6 and FIG. 7, the second guide roller set
22 includes a second guide roller set for the upward/downward
directions (hereunder, referred to as "second upward/downward guide
roller set") 22A, and a second guide roller set for the left/right
directions (hereunder, referred to as "second left/right guide
roller set") 22B. The second upward/downward guide roller set 22A
includes a second roller shaft for the upward/downward directions
(hereunder, referred to as "second upward/downward roller shaft)
56a as one first support body, and the second guide rollers 22u and
22d. The second guide rollers 22u and 22d are pivotably disposed on
the second upward/downward roller shaft 56a, respectively.
[0116] The second left/right guide roller set 22B includes a second
roller shaft for the left/right directions 56b as the other first
support body, and the second guide rollers 22l and 22r. The second
guide rollers 22l and 22r are pivotably disposed on the second
roller shaft for the left/right directions 56b, respectively.
[0117] The second guide rollers 22u and 22d of the second
upward/downward guide roller set 22A are disposed so as to
correspond to the winding start positions 9s that are set on the
lower side in the drawings of the upward rotary body 9u and the
downward rotary body 9d that are disposed on the second pulley
11A2. Further, the second guide rollers 22l and 22r of the second
left/right guide roller set 22B are disposed so as to correspond to
the winding start positions 9s that are set on the upper side in
the drawings of the left rotary body 9l and the right rotary body
9r that are disposed on the first pulley 11A1.
[0118] In the present embodiment, the respective second guide
rollers 22u, 22d, 22l and 22r are pulley lead-in members that guide
the respective bending wires 8u, 8d, 8l and 8r to the pulleys 11A1
and 11A2.
[0119] The third guide roller set 23 includes a third guide roller
set for the upward/downward directions (hereunder, referred to as
"third upward/downward guide roller set") 23A and a third guide
roller set for the left/right directions (hereunder, referred to as
"third left/right guide roller set") 23B. The third upward/downward
guide roller set 23A includes a third roller shaft for the
upward/downward directions 57a as one second support body, and the
third guide rollers 23u and 23d. The third guide rollers 23u and
23d are pivotably disposed on the third roller shaft for the
upward/downward directions 57a.
[0120] The third left/right guide roller set 23B includes a third
roller shaft for the left/right directions 57b as the other second
support body, and the third guide rollers 23l and 23r. The third
guide rollers 23l and 23r are pivotably disposed on the third
roller shaft for the left/right directions 57b.
[0121] The third guide rollers 23u and 23d of the third
upward/downward guide roller set 23A are disposed so as to
correspond to the winding end positions 9e that are set on the
lower side in the drawings of the upward rotary body 9u and the
downward rotary body 9d that are disposed on the second pulley
11A2. Further, the third guide rollers 23l and 23r of the third
left/right guide roller set 23B are disposed so as to correspond to
the winding end positions 9e that are set on the upper side in the
drawings of the left rotary body 9l and the right rotary body 9r
that are disposed on the first pulley 11A1.
[0122] In the present embodiment, the respective third guide
rollers 23u, 23d, 23l and 23r are pulley lead-out members that
guide the respective bending wires 8u, 8d, 8l and 8r from the
pulleys 11A1 and 11A2 towards a desired direction.
[0123] The second guide rollers 22u and 22d that correspond to the
bending wires 8u and 8d and the third guide rollers 23l and 23r
that correspond to the bending wires 8l and 8r are disposed at
predetermined positions in a positional relationship such that the
second guide rollers 22u and 22d and the third guide rollers 23l
and 23r are facing in a manner that interposes therebetween a
hypothetical line (see the chain double-dashed line in FIG. 7) that
links together the centers of the pulley shafts 54 and 55 that are
disposed in parallel.
[0124] Further, a distance w6 between the winding start positions
9s of the rotary bodies 9u and 9d and the winding start positions
9s of the rotary bodies 9l and 9r is configured so that the winding
start positions 9s of the rotary bodies 9u and 9d and the winding
start positions 9s of the rotary bodies 9l and 9r are separated by
a maximum distance amount of the rotary bodies 9.
[0125] As shown in FIG. 6, the second guide roller 22r, the right
rotary body 9r, and the third guide roller 23r are disposed in a
straight line, and the second guide roller 21d, the downward rotary
body 9d, and the third guide roller 23d are disposed in a straight
line. Likewise, the second guide roller 22l, the left rotary body
9l, and the third guide roller 23l are disposed in a straight line,
and the second guide roller 22u, the upward rotary body 9u, and the
third guide roller 23u are disposed in a straight line.
[0126] Thus, entanglement between the respective bending wires 8u,
8d, 8l and 8r is prevented.
[0127] According to the above described configuration, the bending
wires 8u and 8d are extended to the lower side in FIG. 7 that is
one side inside the operation portion 3 through the guides 24, and
guided to the second guide rollers 22u and 22d. In contrast, the
bending wires 8l and 8r are extended to the upper side in FIG. 7
that is the other side inside the operation portion 3 through the
guides 24, and guided to the second guide rollers 22l and 22r.
[0128] Thereafter, the respective bending wires 8u, 8d, 8l and 8r
are extended in straight lines to the rotary bodies 9u, 9d, 9l and
9r from the second guide rollers 22u, 22d, 22l and 22r, and are
extended in straight lines to the third guide rollers 23u, 23d, 23l
and 23r from the rotary bodies 9u, 9d, 9l and 9r.
[0129] The respective bending wires 8u, 8d, 8l and 8r that are
extended from the third guide rollers 23u, 23d, 23l and 23r are
guided to the wire attachment portions 13u2, 13d2, 13l2 and 13r2 of
the hanging frame 13 through the aforementioned first guide rollers
21u, 21d, 21l and 21r and fixed thereto.
[0130] According to this configuration, the respective bending
wires 8u, 8d, 8l and 8r are smoothly pulled/slackened by a tilt
operation of the operation element 5.
[0131] When the shaft portion 5a of the operation element 5 is in
an upright state in a state in which the motor 12 is driven and the
first pulley 11A1 and the second pulley 11A2 are rotated, the
bending wires 8l and 8r that are respectively wound around the
rotary bodies 9l and 9r disposed on the first pulley 11A1 enter a
predetermined slackened state, and as a result the rotary bodies 9l
and 9r enter a sliding state with respect to the first pulley
11A1.
[0132] In addition, by the bending wires 8u and 8d that are
respectively wound around the rotary bodies 9u and 9d disposed on
the second pulley 11A2 also entering a predetermined slackened
state, the rotary bodies 9u and 9d enter a sliding state with
respect to the second pulley 11A2.
[0133] As a result, the bending portion 2b is maintained in a
straight state.
[0134] On the other hand, to cause the bending portion 2b to
perform a bending operation, for example, in the upward direction,
the operator tilts the operation element 5 in the arrow Yu
direction in FIG. 1. Thereupon, accompanying the operation to tilt
the operation element 5, the hanging frame 13 inclines, and the
upward bending wire 8u fixed to the upward wire attachment portion
13u2 gradually changes from a slackened state to a tensed state. In
contrast, the other bending wires 8d, 8l and 8r change to a state
in which the bending wires are more slackened.
[0135] At this time, only the upward bending wire 8u that has been
wound in a slackened state around the upward rotary body 9u of the
second pulley 11A2 is pulled. Thereupon, the state between the
upward rotary body 9u and the second pulley 11A2 changes to a
closely contacting state. Further, frictional resistance arises
between the upward rotary body 9u and the second pulley 11A2, and
the upward rotary body 9u is rotated while sliding with respect to
the second pulley 11A2 in the same direction as the second pulley
11A2. As a result, the upward bending wire 8u that is disposed
further on the insertion portion 2 side than the upward rotary body
9u is pulled and moved accompanying rotation of the upward rotary
body 9u, and the bending portion 2b starts a bending movement in
the upward direction.
[0136] In this connection, when the operator continues the
operation to tilt the operation element 5 so as to cause the upward
rotary body 9u to closely contact the pulley 11, the bending
portion 2b bends further in the upward direction as described
above. Further, if the operator continues to maintain the tilt
position of the operation element 5, the tensed state of the upward
bending wire 8u and the slackened state of the bending wires 8d, 8l
and 8r that are described above are maintained, and the bent state
of the bending portion 2b is maintained. Subsequently, if the
operator performs a tilt operation with respect to the operation
element 5 to bend the bending portion 2b further in the same
direction, to bend the bending portion 2b in another direction, or
to return the bending portion 2b to the original state thereof, the
bending portion 2b changes to a state that corresponds to the tilt
operation of the operation element 5.
[0137] Thus, the configuration of the pulling member operation
apparatus 10A includes the two pulleys 11A1 and 11A2 that are
disposed in a perpendicular positional relationship with respect to
the motor shaft 12b, and is provided with the driving force
transmitting mechanism portion 30A that transmits a driving force
of the motor 12 to the two pulleys 11A1 and 11A2.
[0138] According to this configuration, while preventing the
diameter of the operation portion from becoming thick by making the
length of the pulleys 11A1 and 11A2 shorter than the length of the
pulley 11, similarly to the first embodiment, the bending portion
2b can be bent by a tilt operation of the operation element 5 which
is erected vertically on the operation portion 3 that has a
longitudinal axis parallel to the longitudinal axis of the
insertion portion 2, and which intersects with the aforementioned
longitudinal axis.
[0139] Further, the bending wire 8u that is led inside the
operation portion 3 is guided to the first guide roller 21u by the
second guide roller 22u, the rotary body 9u, and the third guide
roller 23u that are disposed in a straight line, and is thereafter
led to the wire attachment portion 13u2 of the hanging frame 13.
The bending wire 8d is guided to the first guide roller 21d by the
second guide roller 22d, the rotary body 9d, and the third guide
roller 23d that are disposed in a straight line, and is thereafter
led to the wire attachment portion 13d2 of the hanging frame 13.
The bending wire 8l is guided to the first guide roller 21l by the
second guide roller 22l, the rotary body 9l, and the third guide
roller 23l that are disposed in a straight line, and is thereafter
led to the wire attachment portion 13l2 of the hanging frame 13.
Similarly, the bending wire 8r is guided to the first guide roller
21r by the second guide roller 22r, the rotary body 9r, and the
third guide roller 23r that are disposed in a straight line, and is
thereafter led to the wire attachment portion 13r2 of the hanging
frame 13. Consequently, the bending wire travel paths can be
simplified and a load applied to the respective bending wires 8u,
8d, 8l and 8r can be reduced.
[0140] Further, the rotary bodies 9l, 9r, 9u and 9d are disposed on
the pulleys 11A1 and 11A2 so that the winding start positions 9s of
the upward rotary body 9u and the downward rotary body 9d disposed
on the second pulley 11A2 and the winding start positions 9s of the
left rotary body 9l and the right rotary body 9r disposed on the
first pulley 11A1 are separated by the maximum amount.
Consequently, it is possible to reliably prevent the wires 8 from
tangling together along the wire travel path.
[0141] In this connection, in the above described embodiment, a
configuration is adopted in which the winding start positions 9s of
the left rotary body 9l and the right rotary body 9r disposed on
the first pulley 11A1 are set on the upper side in the drawings,
and the winding start positions 9s of the upward rotary body 9u and
the downward rotary body 9d disposed on the second pulley 11A2 are
set on the lower side in the drawings.
[0142] However, as shown in a pulling member operation apparatus
10A1 illustrated in FIG. 8, a configuration may also be adopted in
which the winding start positions 9s of the upward rotary body 9u
and the downward rotary body 9d disposed on the second pulley 11A2
and the winding start positions 9s of the left rotary body 9l and
the right rotary body 9r disposed on the first pulley 11A1 are
disposed in the same direction.
[0143] In this case, a configuration is adopted in which a fourth
gear (not shown) is added between the second spur gear 34 and the
third spur gear 35 included in the driving force transmitting
mechanism portion 30A, so that the first pulley 11A1 and the second
pulley 11A2 are rotated in the same direction.
[0144] Further, according to the present embodiment, as shown in
FIG. 9, an interval between the upward rotary body 9u and the
downward rotary body 9d that are disposed on the second pulley 11A2
is set to a wider width than an interval between the left rotary
body 9l and the right rotary body 9r that are disposed on the first
pulley 11A1. The second guide rollers 22u, 22d, 22l and 22r and the
third guide rollers 23u, 23d, 23l and 23r are disposed in a
predetermined positional relationship with respect to the rotary
bodies 9u, 9d, 9l and 9r.
[0145] In this connection, when the thickness of the respective
rotary bodies 9 is taken as t, a relation w7<2t is set between
an interval w7 between the left rotary body 9l and the right rotary
body 9r and the thickness t. Thus, entanglement between the wires 8
along the wire travel path is prevented.
[0146] Note that, although not illustrated in the drawings, for
example, a configuration may also be adopted in which the
diametrical dimensions of the upward rotary body 9u and the
downward rotary body 9d are larger than the diametrical dimensions
of the left rotary body 9l and the right rotary body 9r.
[0147] According to this configuration, entanglement between the
wires 8 along the wire travel path can be prevented and the amount
of pulling force can be increased when pulling the upward bending
wire 8u and the downward bending wire 8d. Consequently, a bending
operation in the vertical direction for which the bending angle is
large in comparison to a bending operation in the lateral direction
can be performed more smoothly.
[0148] A second embodiment of the present invention will now be
described referring to FIG. 10 to FIG. 15.
[0149] FIG. 10 is a view that illustrates another configuration of
a pulling member operation apparatus that contains a motor and a
pulley in an operation portion that includes a grasping portion and
an operation portion body. FIG. 11 is a view that illustrates the
pulling member operation apparatus as viewed from the arrow Y11
direction in FIG. 10. FIG. 12 is a view that illustrates a
configuration example of a second guide roller, a third guide
roller, and a plurality of rotary bodies disposed on a pulley as
viewed from the direction of a line indicated by arrows Y12-Y12 in
FIG. 10. FIG. 13 is a view that illustrates a configuration example
of a plurality of second guide rollers, a plurality of third guide
rollers, and a plurality of rotary bodies disposed on a pulley as
viewed from the direction of a line indicated by arrows Y13-Y13 in
FIG. 10, that is a modification example of the arrangement
positions of guide rollers. FIG. 14 is a view that illustrates a
pulley having a configuration that includes a plurality of shaft
bodies, that is a modification example of a pulley. FIG. 15 is a
view that illustrates the pulley as viewed from the direction of a
line indicated by arrows Y15-Y15 in FIG. 14.
[0150] As shown in FIG. 10, a pulling member operation apparatus
10B that is provided inside an operation portion 3 is mainly
constituted by four bending wires 8, an elongated pulley 11 on
which four rotary bodies 9 are arranged, a motor 12, a hanging
frame 13, an operation element 5, and a plurality of guide roller
sets 21, 22 and 23 that include a plurality of guide rollers that
are wire travel path changing members.
[0151] In the present embodiment also, a configuration is adopted
so that the center of gravity of the operation portion 3 is
positioned inside the grasping portion 3a.
[0152] In the present embodiment, the pulley 11 and the motor 12
are disposed at predetermined positions inside the grasping portion
3a so that the longitudinal axis of the pulley 11 and the drive
shaft of the motor 12 are in a parallel positional relationship
with respect to the longitudinal axis of the grasping portion 3a,
respectively. According to this configuration, the pulley 11 is
integrally fixed to a shaft portion 12a of the motor 12, and is
configured to be directly rotated around its axis by the driving
force of the motor 12.
[0153] In this connection, a configuration may also be adopted in
which the longitudinal axis of the pulley 11 and the drive shaft of
the motor 12 are coaxial with respect to the longitudinal axis of
the grasping portion 3a.
[0154] As shown in FIG. 10 and FIG. 11, the first guide roller set
21 is an attachment path setting member that includes the first
guide rollers 21u, 21d, 21l and 21r that are the aforementioned
first wire travel path changing member. The second guide roller set
22 is a pulley lead-in member that includes the second guide
rollers 22u1, 22d1, 22l1 and 22r1 that are second wire travel path
changing members. The third guide roller set 23 is a pulley
lead-out member that includes the third guide rollers 23u1, 23d1,
23l1 and 23r1 that are third wire travel path changing members.
[0155] In the present embodiment, the second guide roller set 22
includes, for example, a cylindrical second roller shaft 22p that
is a support body, and second guide rollers 22u1, 22d1, 22l1 and
22r1 that change wire travel paths. The second guide rollers 22u1,
22d1, 22l1 and 22r1 are pivotably disposed on the second roller
shaft 22p.
[0156] The third guide roller set 23 includes a third roller shaft
23p, and third guide rollers 23u1, 23d1, 23l1 and 23r1 that change
wire travel paths. The third guide rollers 23u1, 23d1, 23l1 and
23r1 are pivotably disposed on the third roller shaft 23p.
[0157] The second roller shaft 22p and the third roller shaft 23p
are disposed at predetermined positions in a parallel positional
relationship with respect to the longitudinal axis of the grasping
portion 3a.
[0158] In this connection, the first roller shaft 21p, the second
roller shaft 22p, and the third roller shaft 23p may be different
members or may be the same member.
[0159] In the present embodiment, with respect to the respective
bending wires 8u, 8d, 8l and 8r that pass through the inside of the
insertion portion 2 and are led into the operation portion 3,
first, the travel paths thereof are changed by the second guide
rollers 22u1, 22d1, 22l1 and 22r1 of the second guide roller set
22, and thereafter the respective bending wires 8u, 8d, 8l and 8r
pass through the winding start positions 9s of the rotary bodies
9u, 9d, 9l and 9r and are wound around the rotary bodies 9u, 9d, 9l
and 9r, respectively.
[0160] Next, after being wound around the rotary bodies 9u, 9d, 9l
and 9r, the travel paths of the respective bending wires 8u, 8d, 8l
and 8r that are led out from the winding end positions 9e are
changed by the third guide rollers 23u1, 23d1, 23l1 and 23r1 of the
third guide roller set 23 so that the respective bending wires 8u,
8d, 8l and 8r travel in the direction of the first guide rollers
21u, 21d, 21l and 21r of the first guide roller set 21.
[0161] Further, the travel paths of the respective bending wires
8u, 8d, 8l and 8r are changed by the first guide rollers 21u, 21d,
21l and 21r as described above so that the bending wires 8u, 8d, 8l
and 8r arrive at the upward wire attachment portion 13u2, the
downward wire attachment portion 13d2, the left wire attachment
portion 13l2, and the right wire attachment portion 13r2 of the
hanging frame 13.
[0162] In this connection, in FIG. 11 also, in order to describe
the positional relation between the respective bending wires 8u,
8d, 8l and 8r and the respective wire attachment portions 13u2,
13d2, 13l2 and 13r2, the position of the hanging frame 13 is
displaced in the right direction in the drawing with respect to the
roller shaft 21p.
[0163] In the present embodiment, the first guide rollers 21u, 21d,
21l and 21r are configured in the same manner as in the above
described embodiment and are disposed on the first roller shaft
21p.
[0164] In contrast, with regard to the second guide rollers 22u1,
22d1, 22l1 and 22r1, the diametrical dimensions thereof are set so
that the diametrical dimensions of the second guide rollers 22u1,
22d1, 22l1 and 22r1 increase in the order of second guide roller
22r1, second guide roller 22d1, second guide roller 22u1 and second
guide roller 22l1. Further, the second roller shaft 22p is disposed
so that the diametrical dimension thereof increases from the
insertion portion 2 side toward the operation element 5 side.
[0165] The diametrical dimensions of the third guide rollers 23u1,
23d1, 23l1 and 23r1 are also different to each other. In the third
guide rollers 23u1, 23d1, 23l1 and 23r1, in the opposite manner to
the second guide rollers 22r1, 22d1, 22u1 and 22l1, the diametrical
dimensions are set so that the diametrical dimensions decrease in
the order of third guide roller 23r1, third guide roller 23d1,
third guide roller 23u1 and third guide roller 23l1. Further, the
third roller shaft 23p is disposed so that the diametrical
dimension thereof decreases from the insertion portion 2 side
toward the operation element 5 side.
[0166] The rotary bodies 9r, 9d, 9u and 9l are disposed on the
pulley 11 from the insertion portion 2 side towards the operation
element 5 side. As shown in FIG. 10 and FIG. 11, the second guide
rollers 22r1, 22d1, 22u1 and 22l1 of the second guide roller set 22
and the guide rollers 23r1, 23d1, 23u1 and 23l1 of the third guide
roller set 23 are disposed at predetermined positions in a
positional relationship in which the second guide rollers 22r1,
22d1, 22u1 and 22l1 and the guide rollers 23r1, 23d1, 23u1 and 23l1
face each other in a manner such that the rotary bodies 9r, 9d, 9u
and 9l of the pulley 11 are interposed therebetween.
[0167] The travel paths inside the operation portion 3 of the
respective bending wires 8u, 8d, 8l and 8r will now be described
referring to FIG. 10, FIG. 11 and FIG. 12.
[0168] As shown in FIG. 11, the respective proximal end portions of
the four bending wires 8u, 8d, 8l and 8r are fixed to the wire
attachment portions 13u2, 13d2, 13l2 and 13r2.
[0169] In contrast, as described above, the distal end portions of
the respective bending wires 8u, 8d, 8l and 8r are fixed at
positions corresponding to upward, downward, left and right of the
distal end bending pieces.
[0170] As shown in FIG. 10, the bending wires 8u, 8d, 8l and 8r
that are fixed to the distal end bending pieces are extended inside
the operation portion 3 through the guides 24. As shown in FIG. 10,
FIG. 11 and FIG. 12, the respective bending wires 8u, 8d, 8l and 8r
are guided to the second guide rollers 22u1, 22d1, 22l1 and 22r1,
and the wire travel paths are changed.
[0171] As described above, the diametrical dimensions of the second
guide rollers 22u1, 22d1, 22l1 and 22r1 are different to each
other, and the second guide rollers 22u1, 22d1, 22l1 and 22r1 are
disposed on the second roller shaft 22p so that the diametrical
dimensions increase from the insertion portion 2 side towards the
operation element 5 side. Consequently, the respective bending
wires 8u, 8d, 8l and 8r enter onto the second guide rollers 22u1,
22d1, 22l1 and 22r1 and thereafter exit therefrom without the wires
interfering with each other. As a result, the travel paths are
changed without the bending wires 8u, 8d, 8l and 8r tangling
together.
[0172] The bending wires 8u, 8d, 8l and 8r whose travel paths have
been changed at the second guide rollers 22u1, 22d1, 22l1 and 22r1
are wound around the rotary bodies 9u, 9d, 9l and 9r that are
disposed in a loosely fitting state on the pulley 11. More
specifically, the respective bending wires 8u, 8d, 8l and 8r are
wound around the rotary bodies 9u, 9d, 9l and 9r, respectively, so
as to be in a predetermined slackened state from the respective
winding start positions 9s. Further, the respective bending wires
8u, 8d, 8l and 8r are led out towards the third guide rollers 23u1,
23d1, 23l1 and 23r1 from the winding end positions 9e of the rotary
bodies 9u, 9d, 9l and 9r.
[0173] As described above, the second guide rollers 22r1, 22d1,
22u1 and 22l1 and the third guide rollers 23r1, 23d1, 23u1 and 23l1
are disposed in a facing positional relationship in a manner that
interposes the rotary bodies 9r, 9d, 9u and 9l therebetween.
Accordingly, the bending wires 8u, 8d, 8l and 8r are led out from
the rotary bodies 9u, 9d, 9l and 9r without the wires tangling
together.
[0174] The respective bending wires 8u, 8d, 8l and 8r that are led
out from the rotary bodies 9u, 9d, 9l and 9r are led into the third
guide rollers 23u1, 23d1, 23l1 and 23r1, and thereafter the wire
travel paths thereof are changed in the direction of the first
guide rollers 21u1, 21d1, 21l1, and 21r1.
[0175] As described above, the diametrical dimensions of the third
guide rollers 23u1, 23d1, 23l1 and 23r1 are different, and the
third guide rollers 23u1, 23d1, 23l1 and 23r1 are disposed on the
third roller shaft 23p so that the diametrical dimensions decrease
from the insertion portion 2 side to the operation element 5 side.
Consequently, the respective bending wires 8u, 8d, 8l and 8r enter
onto the third guide rollers 23u1, 23d1, 23l1 and 23r1 and
thereafter exit therefrom without the wires interfering with each
other. As a result, the travel paths are changed without the
bending wires 8u, 8d, 8l and 8r tangling together.
[0176] The first wires 8u, 8d, 8l and 8r whose travel paths have
been changed at the first guide rollers 21u, 21d, 21l and 21r are
guided to and fixed to the wire attachment portions 13u2, 13d2,
13l2 and 13r2 included in the hanging frame 13 as described
above.
[0177] The remaining configuration is the same as in the above
described embodiment, and the same members are denoted by the same
reference symbols, and a description of such members is
omitted.
[0178] Thus, in the configuration in which the pulley 11 and the
motor 12 are disposed inside the operation portion 3 that has a
longitudinal axis that is parallel to the longitudinal axis of the
insertion portion 2 included in the endoscope 1, the longitudinal
axis of the pulley 11 and the drive shaft of the motor 12 are
disposed parallel to the longitudinal axis of the grasping portion
3a.
[0179] In addition, the guide roller sets 22 and 23 having the
roller shafts 22p and 23p that are parallel to the longitudinal
axis of the operation portion 3, and the first guide roller set 21
having the first roller shaft 21p that intersects at right angles
with the longitudinal axis of the operation portion 3 are disposed
at predetermined positions as wire travel path changing
members.
[0180] Further, the travel paths of the respective bending wires
8u, 8d, 8l and 8r that are led into the operation portion 3 and
travel towards the proximal end side of the operation portion 3 are
changed in the direction of the winding start positions 9s of the
rotary bodies 9u, 9d, 9l and 9r that are disposed on the pulley 11
by the second guide rollers 22u1, 22d1, 22l1 and 22r1.
[0181] Furthermore, the travel paths of the respective bending
wires 8u, 8d, 8l and 8r that are led out from the winding end
positions of the rotary bodies 9u, 9d, 9l and 9r are changed in the
direction of the first guide rollers 21u, 21d, 21l and 21r by the
third guide rollers 23u1, 23d1, 23l1 and 23r1.
[0182] Finally, the travel paths of the respective bending wires
8u, 8d, 8l and 8r are changed by the first guide rollers 21u, 21d,
21l and 21r, and the respective bending wires 8u, 8d, 8l and 8r are
led to the wire attachment portions 13u2, 13d2, 13l2 and 13r2 of
the hanging frame 13 are fixed thereto.
[0183] According to the endoscope 1 configured in the above
described manner, in a state in which the motor 12 is driven and
the pulley 11 is rotated, when the shaft portion 5a of the
operation element 5 is in an upright state, similarly to the above
described embodiment, each of the bending wires 8u, 8d, 8l and 8r
that are wound around the rotary bodies 9u, 9d, 9l and 9r disposed
on the pulley 11, respectively, enters a predetermined slackened
state, and the bending portion 2b is maintained in a straight
state.
[0184] On the other hand, in a state in which the operator has
grasped the grasping portion 3a, to cause the bending portion 2b to
perform a bending operation in, for example, the upward direction,
the operator places the ball of the thumb on the finger contact
portion 5b of the operation element 5 and tilts the shaft portion
5a in the direction of the arrow Yu in FIG. 1. Thereupon, similarly
to the above described embodiment, accompanying the operation to
tilt the operation element 5, the hanging frame 13 inclines, and
the upward bending wire 8u that is fixed to the upward wire
attachment portion 13u2 gradually changes from a slackened state to
a tensed state. As a result, among the respective bending wires 8u,
8d, 8l and 8r that have been wound in a slackened state around the
rotary bodies 9u, 9d, 9l and 9r of the pulley 11, only the upward
bending wire 8u is pulled. Thereupon, the gap 9c of the upward
rotary body 9u is narrowed in resistance to the elastic force and
is contracted, and the state changes to one in which the upward
rotary body 9u and the pulley 11 are in a closely contacting state.
As a result, frictional resistance arises between the upward rotary
body 9u and the pulley 11, and the upward rotary body 9u is rotated
while sliding with respect to the pulley 11 in the same direction
as the pulley 11. Consequently, the upward bending wire 8u that is
disposed further on the insertion portion 2 side than the upward
rotary body 9u is pulled and moved accompanying rotation of the
upward rotary body 9u, and the bending portion 2b starts a bending
movement in the upward direction.
[0185] Thereafter, if the operator continues the operation to tilt
the shaft portion 5a in the same direction so as to cause the
upward rotary body 9u to closely contact the pulley 11, the upward
rotary body 9u that is in the closely contacting state is brought
into even closer contact with the pulley 11 and the frictional
force increases further. As a result, the wire for upward bending
8u that is disposed at a position that is further on the insertion
portion 2 side than the upward rotary body 9u is pulled and moved
to a further degree accompanying rotation of the rotary body 9u,
and thus the bending portion 2b bends further in the upward
direction.
[0186] In contrast, if the operator continues to maintain the tilt
position of the operation element 5, the tightness between the
upward rotary body 9u and the pulley 11 is maintained. Thus,
movement stops in a state in which a tensile force has arisen at
the upward bending wire 8u disposed at a position that is further
on the distal end side than the upward rotary body 9u.
[0187] At this time, each of the bending wires 8d, 8l and 8r is in
a slackened state. Accordingly, by continuing to maintain the
operation element 5 in this tilted state, the tensed state of the
upward bending wire 8u and the slackened state of the bending wires
8d, 8l and 8r are maintained, respectively, and the bending portion
2b is maintained in the bent state.
[0188] According to this configuration, by disposing the motor 12
and the pulley 11 on the same axis, the same actions and effects as
described above are obtained while directly driving the pulley 11
by the driving force of the motor 12.
[0189] In this connection, in the above described embodiment a
configuration is adopted in which the second guide roller set 22
that includes the second guide rollers 22u1, 22d1, 22l1 and 22r1
and the third guide roller set 23 that includes the third guide
rollers 23u1, 23d1, 23l1 and 23r1 are disposed in a facing
positional relationship in a manner that interposes the rotary
bodies 9u, 9d, 9l and 9r disposed on the pulley 11 therebetween.
However, a configuration may also be adopted in which, as shown in
FIG. 13, the second guide rollers 22r, 22d, 22u and 22l and the
third guide rollers 23r, 23d, 23u and 23l are not configured as a
guide roller set, but are individually disposed at predetermined
positions.
[0190] As shown in FIG. 13, the diametrical dimensions of the
second guide rollers 22r2, 22d2, 22u2 and 2212 of the present
embodiment and the third guide rollers 23r2, 23d2, 22u2 and 23l2
are the same. In addition, each of the second guide rollers 22r2,
22d2, 22u2 and 2212 and each of the third guide rollers 23r2, 23d2,
23u2 and 23l2 are pivotably provided in an individual manner on a
roller shaft 25. Further, each of the second guide rollers 22r2,
22d2, 22u2 and 2212 and each of the third guide rollers 23r2, 23d2,
23u2 and 23l2 are individually disposed at a predetermined position
by deviating the positions thereof in the circumferential direction
with respect to the outer circumference of the pulley 11 on which
the rotary bodies 9r, 9d, 9u and 9l are disposed. The remaining
configuration of the pulling member operation apparatus 10B1 is the
same as in the above described embodiment.
[0191] According to the above described configuration, the
respective bending wires 8u, 8d, 8l and 8r that are extended into
the operation portion 3 through the guides 24 are guided to the
corresponding second guide rollers 22u2, 22d2, 2212 and 22r2 and
the wire travel paths are changed. The second guide rollers 22u2,
22d2, 2212 and 22r2 are pivotably disposed at predetermined
positions with respect to the rotary bodies 9u, 9d, 9l and 9r.
Consequently, the respective bending wires 8u, 8d, 8l and 8r enter
onto the second guide rollers 22u2, 22d2, 2212 and 22r2 and
thereafter exit therefrom without the wires interfering with each
other. As a result, the travel paths are changed without the
bending wires 8u, 8d, 8l and 8r tangling together.
[0192] Further, the respective bending wires 8u, 8d, 8l and 8r that
are led out from the rotary bodies 9u, 9d, 9l and 9r are led into
the third guide rollers 23u2, 23d2, 23l2 and 23r2, and thereafter
the wire travel paths are changed in the direction of the first
guide rollers 21u, 21d, 21l, and 21r.
[0193] The third guide rollers 23u2, 23d2, 23l2 and 23r2 are
pivotably disposed at predetermined positions with respect to the
rotary bodies 9u, 9d, 9l and 9r. Consequently, the respective
bending wires 8u, 8d, 8l and 8r enter onto the third guide rollers
23u2, 23d2, 23l2 and 23r2 and thereafter exit therefrom without the
wires interfering with each other. As a result, the travel paths
are changed without the bending wires 8u, 8d, 8l and 8r tangling
together.
[0194] Thus, the same actions and effects as in the above described
embodiment can be obtained.
[0195] Further, in the above described second embodiment, a
configuration is adopted in which the four rotary bodies 9u, 9d, 9l
and 9r are disposed on the elongated pulley 11. However, the
configuration of the pulley 11 and the rotary bodies 9u, 9d, 9l and
9r are not limited thereto, and a configuration of a pulley 111 as
shown in FIG. 14 and FIG. 15 may be adopted.
[0196] The pulley 111 in a pulling member operation apparatus 10B2
of the present embodiment that is shown in FIG. 14 and FIG. 15
includes a first shaft body 112 that is fixed to the shaft portion
12a of the motor 12 on which the rotary body 9 is disposed in a
predetermined loosely fitting state, two second shaft bodies 113
and 114 on which the rotary bodies 9 are disposed in a
predetermined loosely fitting state, respectively, and a third
shaft body 115 on which the rotary body 9 is disposed in a
predetermined loosely fitting state.
[0197] The first shaft body 112 includes a fixing section (unshown)
on which the shaft portion 12a of the motor 12 is arranged on one
surface side, and has a geared protrusion 116 on the other surface
side. The second shaft bodies 113 and 114 each have a geared
protrusion 117 on one surface side and have a geared protrusion 118
on the other surface side. The third shaft body 115 has a geared
protrusion 119 on one surface side.
[0198] The geared protrusion 117 of the second shaft body 113
intermeshes with the geared protrusion 116 of the first shaft body
112. The geared protrusion 117 of the second shaft body 114
intermeshes with the geared protrusion 118 of the second shaft body
113. Further, the geared protrusion 119 of the third shaft body 115
intermeshes with the geared protrusion 118 of the second shaft body
114.
[0199] According to this configuration, when the motor 12 enters a
driving state, the first shaft body 112 included in the pulley 111
is rotated by the driving force of the motor 12. Further, the
second shaft body 113, the second shaft body 114 and the third
shaft body 115 included in the pulley 111 are respectively rotated
as the result of the rotation of the first pulley 11 being
transmitted thereto via the geared protrusions 116, 117, 118 and
119.
[0200] As a result, according to the present embodiment, the first
shaft body 112 and the second shaft body 114, for example, rotate
counterclockwise, and the second shaft body 113 and the third shaft
body 115, for example, rotate clockwise.
[0201] In this connection, according to the present embodiment, the
rotary body 9 disposed on the first shaft body 112 acts as the left
rotary body 9l, the rotary body 9 disposed on the second shaft body
113 acts as the downward rotary body 9d, the rotary body 9 disposed
on the second shaft body 114 acts as the upward rotary body 9u, and
the rotary body 9 disposed on the third shaft body 115 acts as the
right rotary body 9r.
[0202] Further, reference symbol 11p1 denotes a first pulley shaft
that pivotably supports the second shaft body 114. The shaft center
of the first pulley shaft 11p1 and the shaft center of the motor
shaft 12b coincide. Reference symbol 11p2 denotes a second pulley
shaft that pivotably supports the second shaft body 113 and the
third shaft body 115.
[0203] As shown in FIG. 15, the axis of the left rotary body 9l and
the axis of the upward rotary body 9u deviate with respect to the
axis of the downward rotary body 9d and the axis of the right
rotary body 9r. Further, the left rotary body 9l and the upward
rotary body 9u are disposed in an opposite direction to the
downward rotary body 9d and the right rotary body 9r.
[0204] As a result, the second guide rollers 22r2 and 22d2 and the
second guide rollers 22u2 and 2212 are disposed at predetermined
positions with respect to the rotary bodies 9u, 9d, 9l and 9r in a
facing positional relationship in a manner that interposes a
dividing line 11d therebetween. The dividing line 11d is orthogonal
to the center of a line segment that joins the shaft center of the
motor shaft 12a and the shaft center of the second pulley shaft
11p2.
[0205] Further, the third guide rollers 23r2 and 23d2 and the third
guide rollers 23u2 and 23l2 are also disposed at predetermined
positions with respect to the rotary bodies 9u, 9d, 9l and 9r in a
facing positional relationship in a manner that interposes the
dividing line 11d therebetween. The remaining configuration is the
same as in the above described embodiment. According to the above
configuration, the respective bending wires 8u, 8d, 8l and 8r that
extend inside the operation portion 3 through the guides 24 are
guided to the second guide rollers 22u2, 22d2, 2212 and 22r2 that
are provided in pairs on either side of the dividing line 11d, and
the wire travel paths are changed. Further, the respective bending
wires 8u, 8d, 8l and 8r that are led out from the rotary bodies 9u,
9d, 9l and 9r are also guided on the third guide rollers 23u2,
23d2, 23l2 and 23r2 that are provided in pairs on either side of
the dividing line 11d, and thereafter the wire travel paths are
changed in the direction of the first guide rollers 21u, 21d, 21l
and 21r.
[0206] Thus, the travel paths of the bending wires 8 are changed by
the second guide rollers 22u2 and 2212 and the second guide rollers
22d2 and 22r2, as well as the third guide rollers 23u2 and 23l2 and
the third guide rollers 23d2 and 23r2 that are provided in pairs on
either side of the dividing line 11d. Consequently, interference
between the bending wires 8u, 8d, 8l and 8r can be reliably
prevented, and the travel paths can be changed without the bending
wires 8u, 8d, 8l and 8r tangling together.
[0207] Thus, the same actions and effects as the above described
embodiment can be obtained.
[0208] FIG. 16 to FIG. 24 relate to a third embodiment of the
present invention. FIG. 16 is a view that illustrates an operation
portion that includes a pulling member operation apparatus in which
a motor having a motor shaft that is disposed so as to be
orthogonal to a longitudinal axis of the operation portion, and a
pulley having a pulley shaft that is disposed so as to be
orthogonal to the longitudinal axis are contained in an operation
portion body. FIG. 17 is a view that illustrates the pulling member
operation apparatus that is provided inside the operation portion
body. FIG. 18 is a perspective view that illustrates the
configuration of the pulling member operation apparatus. FIG. 19 is
a top view of the pulling member operation apparatus illustrated in
FIG. 18. FIG. 20 is a side view of the pulling member operation
apparatus illustrated in FIG. 18. FIG. 21 is a top view of a
pulling member operation apparatus in which the arrangement
positions of the guide rollers are different. FIG. 22 is a side
view of the pulling member operation apparatus illustrated in FIG.
21. FIG. 22 is a top view of a pulling member operation apparatus
in which coil pipes are used as travel path changing members. FIG.
24 is a side view of the pulling member operation apparatus shown
in FIG. 23.
[0209] As shown in FIG. 16 and FIG. 17, an endoscope 1A of the
present embodiment includes an insertion portion 2, an operation
portion 3A, and a universal cord 4. An operation element 5 that is
included in a pulling member operation apparatus 10C is erected
vertically on the operation portion 3A. The insertion portion 2
includes a distal end portion 2a, a bending portion 2b, and a
flexible tube portion 2c that are connected in series in that order
from the distal end side. The operation portion 3A includes a
grasping portion 3a that is connected in series to the insertion
portion 2, and an operation portion body 3b1 that is connected in
series to the grasping portion 3a. The operation element 5 that is
used to perform an operation to cause the bending portion 2b to
carry out a bending operation is provided inside the operation
portion body 3b1.
[0210] In the endoscope 1A of the present embodiment also, the
longitudinal axis of the insertion portion 2 and the longitudinal
axis of the grasping portion 3a included in the operation portion
3A are set so as to be in a parallel positional relationship with
each other. For example, as shown in FIG. 17, the longitudinal axis
of the insertion portion 2 and the longitudinal axis of the
grasping portion 3a are coaxial. Further, in the present
embodiment, an axial line of the shaft portion 5a included in the
operation element 5 and the longitudinal axis of the operation
portion 3 are set in a mutually intersecting positional
relationship.
[0211] In this connection, in addition to the operation element 5,
for example, a switch (unshown) that is operated to input an
instruction to perform various kinds of image pickup operations of
an image pickup apparatus (unshown) that is provided inside the
distal end portion 2a, an air/water supply button 6b1 and a suction
button 6c1 are provided at predetermined positions on the exterior
of the operation portion body 3b1. Further, a channel insertion
port 6d is provided on the exterior of the grasping portion 3a.
[0212] The operation element 5 is provided at a position at which
the operation element 5 is operated by a thumb of the hand of the
operator which grasps the grasping portion 3a of the operation
portion 3A in a case where the operator grasps the grasping portion
3a with the left hand in the same manner as for a conventional
endoscope, and the air/water supply button 6b1 and the suction
button 6c1 are provided at positions at which the air/water supply
button 6b1 and the suction button 6c1 are operated by fingers other
than the thumb of the hand with which the operator grasps the
grasping portion 3a. Reference symbol 3b2 in FIG. 16 denotes an
operation portion body casing that can be detached from a body
portion 3b3 that is shown in FIG. 16 and FIG. 17.
[0213] The remaining configuration is the same as in the endoscope
1 of the above described embodiment, and in the following
description the same members are denoted by the same reference
symbols, and a description of such members is omitted.
[0214] The configuration and action of the pulling member operation
apparatus 10C will now be described referring to FIG. 17 to FIG.
20.
[0215] The pulling member operation apparatus 10C is mainly
constituted by the above described four bending wires 8u, 8d, 8l
and 8r, four rotary bodies 9u, 9d, 9l and 9r, pulley 11, motor 12,
hanging frame 13, and operation element 5, as well as a plurality
of guide roller sets 41, 42, 43, and 44 that change the travel
paths of the four wires 8u, 8d, 8l and 8r inside the operation
portion 3.
[0216] In the present embodiment, the pulley 11 and the motor 12
are disposed at predetermined positions inside the operation
portion body 3b1 so that the longitudinal axis of the pulley 11 and
the drive shaft of the motor 12 are in a perpendicular positional
relationship with respect to the longitudinal axis of the operation
portion 3 (grasping portion 3a), respectively. Further, the pulley
11 and the motor 12 are separate elements, and as shown in FIG. 17,
for example, the pulley 11 and the motor 12 are arranged
side-by-side in the axis direction of the operation element 5.
[0217] A motor-side gear (unshown) is provided on a shaft (unshown)
of the motor 12, and a pulley-side gear (see reference numeral 49
in FIG. 19) is provided at a predetermined position on the pulley
11. The pulley-side gear 49 is arranged so as to intermesh with the
motor-side gear. The pulley 11 configured in this manner rotates
around its axis when rotation of the motor 12 is transmitted to the
pulley 11 through the motor-side gear and the pulley-side gear 49.
That is, the motor-side gear and the pulley-side gear are driving
force transmitting means.
[0218] In this connection, the motor 12 is not shown in FIG. 18 to
FIG. 20, the pulley 11 is not shown in FIG. 18, and the upward
frame 13u and the downward frame 13d of the hanging frame 13 are
represented by a dashed line in FIG. 19. Further, the pulley 11 on
which the four rotary bodies 9u, 9d, 9l and 9r are disposed is
displaced further to the right direction in the drawings relative
to the fourth guide roller set 44 to show the travel paths of the
bending wires 8u, 8d, 8l and 8r.
[0219] The guide roller sets 41, 42, 43 and 44 that are wire travel
path changing members of the present embodiment will now be
described.
[0220] Reference symbols 41A and 41B shown in FIG. 18 and FIG. 19
denote the first guide roller set 41. Reference symbol 41A denotes
a first guide roller set for the upward/downward directions
(hereunder, abbreviated to "upward/downward guide roller set") 41A.
The upward/downward guide roller set 41A includes a first roller
shaft for the upward/downward directions 41p as a first support
body, and two first guide rollers 41u and 41d. The two first guide
rollers 41u and 41d are wire travel path changing members, and are
pivotably disposed on the first roller shaft for the
upward/downward directions 41p.
[0221] Reference symbol 41B denotes a first guide roller set for
the left/right directions (hereunder, abbreviated to "left/right
guide roller set") 41B. The left/right guide roller set 41B
includes a first roller shaft for the left/right directions 41p as
a first support body, and two first guide rollers 41l and 41r. The
two first guide rollers 41l and 41r are wire travel path changing
members, and are pivotably disposed on the first roller shaft for
the left/right directions 41p.
[0222] The second guide roller set 42 includes a second roller
shaft 42p, and second guide rollers 42u, 42d, 42l and 42r and guide
rollers 21u, 21d, 21l and 21r. In the present embodiment, the two
kinds of guide rollers, namely the second guide rollers 42u, 42d,
42l and 42r and the guide rollers 21u, 21d, 21l and 21r are
pivotably disposed in a collective manner on the second roller
shaft 42p. The second guide rollers 42u, 42d, 42l and 42r are wire
travel path changing members, and are wire delivery members. The
guide rollers 21u, 21d, 21l and 21r are attachment path setting
member that are described above.
[0223] The third guide roller set 43 includes a third roller shaft
43p and third guide rollers 43u, 43d, 43l and 43r. The third guide
rollers 43u, 43d, 43l and 43r are pivotably disposed on the third
roller shaft 43p and change the wire travel paths. In the present
embodiment, the third guide rollers 43u, 43d, 43l and 43r are
pulley lead-in members.
[0224] The fourth guide roller set 44 includes a fourth roller
shaft 44p and fourth guide rollers 44u, 44d, 44l and 44r. The
fourth guide rollers 44u, 44d, 44l and 44r are pivotably disposed
on the fourth roller shaft 43p and change the wire travel paths. In
the present embodiment, the fourth guide rollers 44u, 44d, 44l and
44r are pulley lead-out members.
[0225] In the present embodiment, all of the roller shafts 41p,
42p, 43p and 44p are disposed at predetermined positions in an
intersecting positional relationship with respect to the
longitudinal axis of the operation portion 3. The second roller
shaft 42p is disposed directly below the shaft portion 5a, and the
center of the second roller shaft 42p is positioned on the central
axis of the shaft portion 5a in an upright state.
[0226] The upward/downward guide roller set 41A and the left/right
guide roller set 41B are disposed, for example, in a stacked
arrangement in the axis direction of the operation element 5 inside
the grasping portion 3a. Further, the upward/downward guide roller
set 41A and the left/right guide roller set 41B are disposed at
positions that are further to the distal end side than the
operation element 5, in other words, at positions that are further
to the distal end side than the second guide roller set 42.
[0227] The third guide roller set 43 and the fourth guide roller
set 44 are disposed at positions that are further to the proximal
end side than the operation element 5, in other words, at positions
that are further to the proximal end side than the second guide
roller set 42. The pulley 11 is disposed at a position that is
furthest on the proximal end side. Specifically, the third guide
roller set 43, the fourth guide roller set 44 and the pulley 11 are
disposed in that order on the proximal end side from the operation
element 5 side.
[0228] First guide rollers 41d and 41u are disposed in that order
in the arrow Y19 direction on the first roller shaft for the
upward/downward directions 41p of the upward/downward guide roller
set 41A. Further, first guide rollers 41r and 41l are disposed in
that order in the arrow Y19 direction on the first roller shaft for
the left/right directions 41p of the left/right guide roller set
41B.
[0229] The third guide rollers 43r, 43d, 43u and 44l are disposed
in that order in the arrow Y19 direction on the third roller shaft
43p. The fourth guide rollers 44r, 44d, 44u and 44l are disposed in
that order in the arrow Y19 direction on the fourth roller shaft
44p. The rotary bodies 9r, 9d, 9u and 9l are disposed in that order
in the arrow Y19 direction on the pulley 11.
[0230] The second guide rollers 42u, 42d, 42l and 42r and the guide
rollers 21u, 21d, 21l and 21r are disposed in the following order
in the arrow Y19 direction on the second roller shaft 42p of the
second guide roller set 42.
[0231] Specifically, the order is guide roller for right 21r,
second guide roller for right 42r, second guide roller for downward
42d, guide roller for downward 21d, guide roller for upward 21u,
second guide roller for upward 42u, second guide roller for left
42l, and guide roller for left 21l.
[0232] In the present embodiment, the respective width dimensions
and diameters of the guide roller for right 21r and the guide
roller for left 21l that are disposed at the two ends are set to
predetermined width dimensions and predetermined diameters that are
wider than and larger than, respectively, the respective width
dimensions and diameters of the other guide rollers 42u, 42d, 42l,
42r, 21u, and 21d that are disposed between the guide roller for
right 21r and the guide roller for left 21l.
[0233] When the maximum external diameter of the guide roller for
right 21r and the guide roller for left 21l is taken as w8, a
relation between the maximum external diameter w8 and an interval
w10 between the guide roller for right 21r and the guide roller for
left 21l is set so that w10>w8.
[0234] Further, an interval between the guide roller for upward 21u
and the guide roller for downward 21d is set to the interval w1
between the upward wire attachment portion 13u2 and the downward
wire attachment portion 13d2 that is described above.
[0235] In addition, a relation between the interval w4 between the
left wire attachment portion 13l2 and the right wire attachment
portion 13r2 and the interval w10 between the outer end of the
guide roller for right 21r and the outer end of the guide roller
for left 21l that are disposed on the second roller shaft 42p is
set so that w4>w10.
[0236] The wire travel paths within the operation portion 3 of the
bending wires 8u, 8d, 8l and 8r will now be described referring to
FIG. 18 to FIG. 20.
[0237] The respective bending wires 8u, 8d, 8l and 8r that are
fixed to distal end bending pieces are extended inside the grasping
portion 3a through guides (unshown). The bending wires 8u, 8d, 8l
and 8r are guided to the first guide rollers 41u and 41d, of the
upward/downward guide roller set 41A and the first guide rollers
41l and 41r of the left/right guide roller set 41B that are
disposed in the grasping portion 3a, and the wire travel paths
thereof are changed.
[0238] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the first guide rollers 41u, 41d, 41l
and 41r are guided to the second guide rollers 42u, 42d, 42l and
42r of the second guide roller set 42, and the wire travel paths
thereof are changed.
[0239] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the second guide rollers 42u, 42d, 42l
and 42r are guided to the third guide rollers 43u, 43d, 43l and 43r
of the third guide roller set 43, and the wire travel paths thereof
are changed.
[0240] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the third guide rollers 43u, 43d, 43l
and 43r are guided to the winding start positions 9s of the
respective rotary bodies 9u, 9d, 9l and 9r that are disposed in a
slackened state on the pulley 11.
[0241] The bending wires 8u, 8d, 8l, and 8r that have been guided
to the winding start positions 9s of the respective rotary bodies
9u, 9d, 9l and 9r are wound around the respective rotary bodies 9u,
9d, 9l and 9r in a predetermined slackened state, and are extended
from the respective winding end positions 9e.
[0242] The respective bending wires 8u, 8d, 8l and 8r that have
been extended from the winding end positions 9e of the respective
rotary bodies 9u, 9d, 9l and 9r are guided to the fourth guide
rollers 44u, 44d, 44l and 44r of the fourth guide roller set 44,
and the wire travel paths thereof are changed.
[0243] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the fourth guide rollers 44u, 44d, 44l
and 44r are guided to the guide rollers 21u, 21d, 21l and 21r of
the second guide roller set 42, and the wire travel paths are
changed to guide the respective bending wires 8u, 8d, 8l and 8r to
the wire attachment portions 13u2, 13d2, 13l2 and 13r2, and the
respective bending wires 8u, 8d, 8l and 8r are fixed thereto.
[0244] In this connection, according to the present embodiment, the
third guide rollers 43u, 43d, 43l and 43r are disposed facing the
rotary bodies 9u, 9d, 9l and 9r in a manner that takes into
consideration the winding start positions 9s of the rotary bodies
9u, 9d, 9l and 9r. As a result, the respective bending wires 8u,
8d, 8l and 8r are smoothly wound around the respective rotary
bodies 9u, 9d, 9l and 9r.
[0245] In contrast, the fourth guide rollers 44u, 44d, 44l and 44r
are disposed in a manner that takes into consideration the winding
end positions 9e of the rotary bodies 9u, 9d, 9l and 9r and the
positions of the guide rollers 21u, 21d, 21l and 21r. As a result,
the travel paths of the bending wires 8u, 8d, 8l and 8r that are
extended from the winding end positions 9e can be smoothly changed
at the third guide rollers 43u, 43d, 43l and 43r towards the guide
rollers 21u, 21d, 21l and 21r of the second guide roller set
42.
[0246] Further, when the shaft portion 5a of the operation element
5 is in an upright state, the bending wires 8u, 8d, 8l and 8r that
extend from the guide rollers 21u, 21d, 21l and 21r towards the
hanging frame 13 are all in a predetermined slackened state. In
this connection, a configuration may also be adopted in which
partition members 48 that are shown in FIG. 12 are provided between
adjacent bending wires 8 to prevent the bending wires 8 from
tangling together.
[0247] Thus, in the configuration in which the pulley 11 and the
motor 12 are disposed at positions that are furthest on the
proximal end side of the operation portion 3 that includes the
grasping portion 3a that has a longitudinal axis that is parallel
to the longitudinal axis of the insertion portion 2 included in the
endoscope 1A, the longitudinal axis of the pulley 11 and the drive
shaft of the motor 12 are disposed in a perpendicular positional
relationship with respect to the longitudinal axis of the operation
portion 3. In addition, the guide roller sets 41, 42, 43 and 44 are
disposed at predetermined positions as wire travel path changing
members.
[0248] Further, the travel paths of the respective bending wires
8u, 8d, 8l and 8r that are led into the operation portion 3 and
travel towards the proximal end side of the operation portion 3 are
changed by the first guide rollers 41u, 41d, 41l and 41r, the
second guide rollers 42u2, 42d2, 42l2 and 42r2, and the third guide
rollers 43u, 43d, 43l and 43r so that the travel paths change in
the direction of the winding start positions 9s of the rotary
bodies 9u, 9d, 9l and 9r that are disposed on the pulley 11.
[0249] Next, the travel paths of the respective bending wires 8u,
8d, 8l and 8r that are led out from the respective winding end
positions after being wound around the rotary bodies 9u, 9d, 9l and
9r are changed by the fourth guide rollers 44u, 44d, 44l and 44r
and the guide rollers 21u, 21d, 21l and 21r and led and fixed to
the wire attachment portions 13u2, 13d2, 13l2 and 13r2 of the
hanging frame 13 that is fixed to the shaft portion 5a of the
operation element 5.
[0250] According to the endoscope 1A configured in the above
manner, in a state in which the motor 12 is driven and the pulley
11 is rotated, when the shaft portion 5a of the operation element 5
is in an upright state each of the bending wires 8u, 8d, 8l and 8r
that are wound around the rotary bodies 9u, 9d, 9l and 9r disposed
on the pulley 11, respectively, enters a predetermined slackened
state. As a result, similarly to the case described above, the
bending portion 2b is maintained in a straight state.
[0251] On the other hand, in a state in which the operator has
grasped the grasping portion 3a, to cause the bending portion 2b to
perform a bending operation in, for example, the upward direction,
the operator tilts the operation element 5 in the direction of the
arrow Yu in FIG. 16. Thereupon, accompanying the operation to tilt
the operation element 5, the hanging frame 13 inclines, and the
upward bending wire 8u that is fixed to the upward wire attachment
portion 13u2 as described above gradually changes from a slackened
state to a tensed state and the bending portion 2b bends in the
upward direction.
[0252] In contrast, if the operator continues to maintain the tilt
position of the operation element 5, as described above, the tensed
state of the upward bending wire 8u and the slackened state of the
bending wires 8d, 8l and 8r are maintained and thus the bent state
of the bending portion 2b is maintained. Subsequently, if the
operator performs a tilt operation with respect to the operation
element 5 to bend the bending portion 2b further in the same
direction, to bend the bending portion 2b in another direction, or
to return the bending portion 2b to the original state thereof, the
bending wires 8u, 8d, 8l and 8r are pulled or slackened in
accordance with the tilt operation, and the bending portion 2b
changes to a state that corresponds to the tilt operation of the
operation element 5.
[0253] According to this configuration, by using the first guide
rollers 41u, 41d, 41l and 41r, the second guide rollers 42u, 42d,
42l and 42r, the third guide rollers 43u, 43d, 43l and 43r, the
fourth guide rollers 44u, 44d, 44l and 44r, and the guide rollers
21u, 21d, 21l and 21r to change the wire travel paths of the
bending wires 8u, 8d, 8l and 8r that are led into the operation
portion 3, the end portions of the bending wires 8u, 8d, 8l and 8r
can be fixed to the wire attachment portions 13u2, 13d2, 13l2 and
13r2 of the hanging frame 13 that is fixed to the shaft portion 5a
of the operation element 5 having an axis line that intersects with
the longitudinal axis of the operation portion 3, and the bending
wires 8u, 8d, 8l and 8r can be smoothly pulled/slackened by a tilt
operation of the operation element 5.
[0254] Further, according to the endoscope 1A, in a state in which
the operator has grasped the operation portion 3A, that is, during
endoscopy, the operator can easily operate not just the operation
element 5, but also the air/water supply button 6b, the suction
button 6c and the switch 6a.
[0255] In this connection, in the above described embodiment, the
second guide rollers 42u, 42d, 42l and 42r and the guide rollers
21u, 21d, 21l and 21r are disposed on the second roller shaft 42p
of the second guide roller set 42.
[0256] However, as shown in FIG. 21 and FIG. 22, a configuration
may also be adopted in which, instead of the second guide roller
set 42 on which two kinds of guide rollers are disposed, a second
guide roller set 42A on which only the second guide rollers 42u,
42d, 42l and 42r are disposed and a guide roller set 21 on which
only the guide rollers 21u, 21d, 21l and 21r are disposed are
arranged as separate elements at predetermined positions.
[0257] Further, instead of adopting a configuration that changes
the wire travel paths by providing a plurality of guide rollers, a
configuration may be adopted that changes the wire travel paths by
disposing a plurality of coils pipes in the manner shown in FIG. 23
and FIG. 24.
[0258] In the embodiment shown in FIG. 21 and FIG. 22, the second
guide roller set 42 is divided into the second guide roller set 42A
in which the second guide rollers 42u, 42d, 42l and 42r are
disposed at predetermined positions on the second roller shaft
42p1, and the guide roller set 21 in which the guide rollers 21u,
21d, 21l and 21r are disposed at predetermined position on the
roller shaft 21p.
[0259] Further, as shown in FIG. 22, the second guide roller set
42A is disposed directly below the guide roller set 21. In this
arrangement state, as shown by the arrow Y21 in FIG. 21, the guide
rollers 21u, 21d, 21l and 21r and the second guide rollers 42u,
42d, 42l and 42r are disposed in the order of guide roller for
right 21r, second guide roller for right 42r, second guide roller
for downward 42d, guide roller for downward 21d, guide roller for
upward 21u, second guide roller for upward 42u, second guide roller
for left 42l, and guide roller for left 21l.
[0260] According to this configuration, instead of providing the
third guide roller set 43 and the fourth guide roller set 44, the
fourth guide roller set 44 is disposed at a predetermined position
with respect to the rotary bodies 9u, 9d, 9l and 9r of the pulley
11 as a single dual-purpose guide roller set that is used as both
the third guide roller set 43 and the fourth guide roller set 44.
That is, the third guide rollers 43u, 43d, 43l and 43r of the third
guide roller set 43 are removed, and the fourth guide rollers 44u,
44d, 44l and 44r are used both as pulley lead-in members and pulley
lead-out members.
[0261] Therefore, the fourth guide rollers 44 of the fourth guide
roller set 44 are disposed in a manner that takes into
consideration the winding start positions 9s of the rotary bodies
9u, 9d, 9l and 9r, and are also disposed in a manner that takes
into consideration the winding end positions 9e of the winding end
positions 9e of the rotary bodies 9u, 9d, 9l and 9r and the
position of the guide roller set 21. As a result, the respective
bending wires 8u, 8d, 8l and 8r are smoothly wound around the
rotary bodies 9u, 9d, 9l and 9r, and the travel paths of the
respective bending wires 8u, 8d, 8l and 8r that are extended from
the winding end positions 9e of the respective rotary bodies 9u,
9d, 9l and 9r can be smoothly changed in the direction of the guide
rollers 21u, 21d, 21l and 21r of the guide roller set 21.
[0262] The wire travel paths inside the operation portion 3 of the
bending wires 8u, 8d, 8l and 8r will now be described referring to
FIG. 21 and FIG. 22.
[0263] In the present embodiment also, the bending wires 8u, 8d, 8l
and 8r are extended within the grasping portion 3a through guides
(unshown). Further, the bending wires 8u, 8d, 8l and 8r are guided
to the first guide rollers 41u and 41d of the upward/downward guide
roller set 41A and the first guide rollers 41l and 41r of the
left/right guide roller set 41B that are disposed in the grasping
portion 3a, and the wire travel paths are changed.
[0264] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the first guide rollers 41u, 41d, 41l
and 41r are guided to the second guide rollers 42u, 42d, 42l and
42r of the second guide roller set 42A, and the wire travel paths
are changed.
[0265] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the second guide rollers 42u, 42d, 42l
and 42r are guided to the fourth guide rollers 44u, 44d, 44l and
44r of the fourth guide roller set 44, and the wire travel paths
are changed.
[0266] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the fourth guide rollers 44u, 44d, 44l
and 44r are guided to the winding start positions 9s of the rotary
bodies 9u, 9d, 9l and 9r that are disposed in a slackened state on
the pulley 11.
[0267] The respective bending wires 8u, 8d, 8l and 8r that have
been guided to the winding start positions 9s of the rotary bodies
9u, 9d, 9l and 9r are wound around the respective rotary bodies 9u,
9d, 9l and 9r so as to enter a predetermined slackened state, and
are extended from the respective winding end positions 9e.
[0268] The respective bending wires 8u, 8d, 8l and 8r that have
been extended from the winding end positions 9e of the respective
rotary bodies 9u, 9d, 9l and 9r are again guided to the fourth
guide rollers 44u, 44d, 44l and 44r of the fourth guide roller set
44, and the wire travel paths are changed.
[0269] The respective bending wires 8u, 8d, 8l and 8r whose travel
paths have been changed at the fourth guide rollers 44u, 44d, 44l
and 44r are guided to the guide rollers 21u, 21d, 21l and 21r of
the guide roller set 21, at which the wire travel paths are
changed, and are then guided and fixed to the wire attachment
portions 13u2, 13d2, 13l2 and 13r2.
[0270] In the present embodiment, by eliminating the third guide
roller set 43 and causing the fourth guide roller set 44 to have
the above described travel path changing function of the third
guide roller set 43 in addition to the travel path changing
function of the fourth guide roller set 44, the number of
components can be decreased and the size of the operation portion
body can be reduced. The other actions and effects are the same as
in the above described third embodiment.
[0271] In the embodiment shown in FIG. 23 and FIG. 24, instead of
providing a plurality of guide roller sets to change the travel
paths of the bending wires 8, the travel paths of the bending wires
8 are changed by providing the first guide roller set 41, a
plurality of coil pipes 45a, 45b, 45c, 45d, and 45e, and a
plurality of coil pipe brackets 46a and 46b.
[0272] In this case, the coil pipes 45a, 45b, 45c, 45d and 45e are
travel path changing members and, for example, are made of metal.
Each of the coil pipes 45a, 45b, 45c, 45d and 45e has a
through-hole through which the bending wire 8 can be inserted so as
to freely advance and retract.
[0273] The first coil pipe bracket 46a is a rectangular
parallelepiped shape, and is disposed directly below the operation
element 5. A plurality of pipe connection ports (unshown) are
provided in a first face 46a1, a second face 46a2, and a third face
46a3 of the first coil pipe bracket 46a. Predetermined pipe
connection ports communicate with each other through communicating
holes 45ah1 and 45ah2.
[0274] The second coil pipe bracket 46b is a rectangular
parallelepiped shape, and is disposed in the vicinity of the pulley
11. Eight pipe connection ports (unshown) are provided on a first
face 46b1 and a second face 46b2 of the second coil pipe bracket
46b, respectively. Predetermined pipe connection ports communicate
with each other through communicating holes 46bh1 and 46bh2.
[0275] The first coil pipes 45a guide the bending wires 8 to a
first communicating hole 46ah1 of the first coil pipe bracket 46a.
The first coil pipes 45a are disposed between the first guide
roller set 41 and the first coil pipe bracket 46a. The distal end
portions of the first coil pipes 45a are provided in the vicinity
of the first guide rollers 41u and 41d of the upward/downward guide
roller set 41A and the vicinity of the first guide rollers 41l and
41r of the left/right guide roller set 41B. The proximal end
portions of the first coil pipes 45a are fixed to pipe connection
ports provided in the first face 46a1 of the first coil pipe
bracket 46a.
[0276] The second coil pipes 45b guide the bending wires 8 from the
first communicating hole 46ah1 of the first coil pipe bracket 46a
to a first communicating hole 46bh1 of the second coil pipe bracket
46b. The distal end portions of the second coil pipes 45b are fixed
to pipe connection ports provided in the second face 46a2 of the
first coil pipe bracket 46a. The proximal end portions of the
second coil pipes 45b are fixed to pipe connection ports provided
in the first face 46b1 of the second coil pipe brackets 46b.
[0277] The third coil pipes 45c guide the bending wires 8 to
winding start positions 9s of the rotary bodies 9 disposed on the
pulley 11. The distal end portions of the third coil pipe 45c are
fixed to pipe connection ports provided in the second face 46b2 of
the second coil pipe bracket 46b. Openings of the proximal end
portions of the third coil pipes 45c are disposed at predetermined
positions facing the winding start positions 9s of the rotary
bodies 9u, 9d, 9l and 9r. The third coil pipes 45c are pulley
lead-in members.
[0278] The fourth coil pipes 45d guide the bending wires 8 that are
extended from the winding end positions 9e of the rotary bodies 9
to a second communicating hole 46bh2 of the second coil pipe
bracket 46b. The distal end portions of the fourth coil pipes 45d
are fixed to pipe connection ports provided in the second face 46b2
of the second coil pipe bracket 46b. Openings of the proximal end
portions of the fourth coil pipes 45d are disposed at predetermined
positions facing the winding end positions 9e of the rotary bodies
9u, 9d, 9l and 9r. The fourth coil pipes 45d are pulley lead-out
members.
[0279] The fifth coil pipes 45e guide the bending wires 8 from the
second communicating hole 46bh2 of the second coil pipe bracket 46b
to the second communicating hole 46ah2 of the first coil pipe
bracket 46a. The distal end portions of the fifth coil pipes 45e
are fixed to pipe connection ports provided in the second face 46a2
of the first coil pipe bracket 46a. The proximal end portions of
the fifth coil pipes 45e are fixed to pipe connection ports
provided in the first face 46b1 of the second coil pipe bracket
46b.
[0280] The sixth coil pipes 45f guide the bending wires 8 that are
extended from the second communicating hole 46ah2 of the first coil
pipe bracket 46a to the wire attachment portions 13u2, 13d2, 13l2
and 13r2 of the hanging frame 13. The proximal end portions of the
sixth coil pipes 45f are fixed to pipe connection ports provided in
the third face 46a3 of the first coil pipe bracket 46a. Openings of
the distal end portions of the sixth coil pipes 45f are disposed at
predetermined positions facing the wire attachment portions 13u2,
13d2, 13l2 and 13r2. The sixth coil pipes 45f are attachment path
setting members.
[0281] The wire travel paths of the bending wires 8 inside the
operation portion 3 will now be described referring to FIG. 23 and
FIG. 24.
[0282] According to the present embodiment also, the respective
bending wires 8u, 8d, 8l and 8r are extended inside the grasping
portion 3a through guides (unshown). The bending wires 8u, 8d, 8l
and 8r are guided to the first guide rollers 41u and 41d of the
upward/downward guide roller set 41A and the first guide rollers
41l and 41r of the left/right guide roller set 41B that are
disposed in the grasping portion 3a, at which the wire travel paths
are changed.
[0283] For example, after the travel path of the upward bending
wire 8u has been changed at the first guide roller 41u, the upward
bending wire 8u is led into a through-hole of a first coil pipe for
the upward direction 45au. Thereafter, the upward bending wire 8u
passes through the first communicating hole 46ah1 of the first coil
pipe bracket 46a, a through-hole of a second coil pipe for the
upward direction 45bu, the first communicating hole 46bh1 of the
second coil pipe bracket 46b, and a through-hole of a third coil
pipe for the upward direction 45cu, and is guided to the winding
start position 9s of the upward rotary body 9u that is disposed in
a slackened state on the pulley 11.
[0284] Thereafter, the upward bending wire 8u that has been guided
to the winding start position 9s of the upward rotary body 9u is
wound around the upward rotary body 9u so as to be in a
predetermined slackened state, and is extended from the winding end
position 9e.
[0285] The upward bending wire 8u that is extended from the winding
end position 9e of the upward rotary body 9u is led into a
through-hole of a fourth coil pipe for the upward direction 45du.
Thereafter, the upward bending wire 8u passes through the second
communicating hole 46bh2 of the second coil pipe bracket 46b, a
through-hole of a fifth coil pipe for the upward direction 45eu,
the second communicating hole 46ah2 of the first coil pipe bracket
46a, and a through-hole of a sixth coil pipe for the upward
direction 45fu, and arrives at the vicinity of the wire attachment
portion 13u2 to be fixed thereto.
[0286] With respect to the other bending wires 8d, 8l and 8r also,
similarly to the upward bending wire 8u, after the travel paths
have been changed at the respective first guide rollers 41d, 41l
and 41r, the bending wires 8d, 8l and 8r are led into through-holes
of the respective first coil pipes 45a, and pass through
through-holes of the third coil pipes 45cu and are wound around the
respective rotary bodies 9u, 9d, 9l and 9r. Thereafter, the bending
wires 8d, 8l and 8r are led into through-holes of the respective
fourth coil pipes 45d, and pass through through-holes of the sixth
coil pipes 45fu and arrive at the vicinity of the wire attachment
portions 13d2, 13l2 and 13r2 and are fixed to the respective wire
attachment portions 13d2, 13l2 and 13r2.
[0287] According to this configuration, after the travel paths of
the bending wires 8u, 8d, 8l and 8r are changed at the first guide
rollers 41d, 41l and 41r of the first guide roller set 41, the
bending wires 8u, 8d, 8l and 8r are led into through-holes of the
first coil pipes 45a that correspond to the respective bending
wires 8, and are wound around the respective rotary bodies 9u, 9d,
9l and 9r. Next, the bending wires 8u, 8d, 8l and 8r are led into
through-holes of the respective fourth coil pipes 45d, and
thereafter fixed to the wire attachment portions 13d2, 13l2 and
13r2, respectively.
[0288] As a result, entanglement between the bending wires 8 whose
wire travel paths are changed inside the operation portion 3 can be
reliably prevented.
[0289] In this connection, a configuration may also be adopted in
which the first guide rollers 41u, 41d, 41l and 41r are not
provided and the first coil pipes 45a are extended to the distal
end side of the insertion portion 2. The other actions and effects
are the same as the above described third embodiment.
[0290] In the above described embodiment, the pulley 11 and the
motor 12 are disposed inside the operation portion 3. However, the
arrangement positions of the pulley 11 and the motor 12 are not
limited to the inside of the operation portion 3, and as shown in
FIG. 25, a configuration may also be adopted in which the pulley 11
and the motor (unshown) are arranged inside a connector 4c that is
provided at a proximal end portion of the universal cord 4.
[0291] According to this configuration, the bending wire 8 is
extended into the grasping portion 3a through a guide (unshown),
the wire travel path thereof is changed by a plurality of guide
roller sets 61, 62, 63 and the like that are disposed in the
grasping portion 3a to thereby guide the bending wire 8 into the
universal cord 4. Thereafter, the bending wire 8 passes through a
first coil pipe 64 disposed inside the universal cord 4, and the
travel path is then changed by a guide roller set 65 so that the
bending wire 8 is guided to the winding start position 9s of the
rotary body 9 disposed in a slackened state on the pulley 11.
[0292] Further, the bending wire 8 that has been guided to the
winding start position 9s of the rotary body 9 is wound around the
rotary body 9 so as to be in a predetermined slackened state, and
is extended from the winding end position 9e.
[0293] The travel path of the bending wire 8 that has been extended
from the winding end position 9e of the rotary body 9 is changed by
the guide roller set 66 so that the bending wire 8 is guided into
the operation portion 3 through a second coil pipe 67 disposed
inside the universal cord 4. Thereafter, the wire travel path of
the bending wire 8 is changed by a plurality of guide roller sets
68, 69 and the like, and the bending wire 8 arrives at the vicinity
of the wire attachment portion 13u2 and is fixed thereto.
[0294] According to this configuration, the weight of the operation
portion 3 can be reduced by disposing the pulley 11 and the motor
12 that were disposed inside the operation portion 3 in the above
configuration, inside the connector 4c. The other actions and
effects are the same as in the above described third
embodiment.
[0295] It should be understood that the present invention is not
limited to only the above described embodiments, and various
changes and modifications thereof can be made without departing
from the spirit or scope of the invention.
* * * * *