U.S. patent application number 13/835136 was filed with the patent office on 2014-09-18 for active drive mechanism for simultaneous rotation and translation.
This patent application is currently assigned to Hansen Medical, Inc.. The applicant listed for this patent is Hansen Medical, Inc.. Invention is credited to Arkady Kokish, Francis Macnamara.
Application Number | 20140276936 13/835136 |
Document ID | / |
Family ID | 50277107 |
Filed Date | 2014-09-18 |
United States Patent
Application |
20140276936 |
Kind Code |
A1 |
Kokish; Arkady ; et
al. |
September 18, 2014 |
ACTIVE DRIVE MECHANISM FOR SIMULTANEOUS ROTATION AND
TRANSLATION
Abstract
An exemplary drive apparatus is disclosed having a roller
assembly configured to impart axial motion to the elongate member
along a first continuous surface configured to maintain contact
with the elongate member during axial motion. The drive apparatus
may further include a roller support configured to rotate the
roller assembly, thereby imparting rotational motion to the
elongate member. The roller support may be configured to rotate the
roller assembly about a second continuous surface configured to
maintain contact with the roller support during rotational motion.
Moreover, the roller assembly and roller support may be configured
to impart axial and rotational motion independently of one another,
such that a first one of the roller assembly and the roller support
imparts their associated motion regardless of a presence or absence
of motion by the other of the roller assembly and the roller
support.
Inventors: |
Kokish; Arkady; (Los Gatos,
CA) ; Macnamara; Francis; (Mountain View,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hansen Medical, Inc. |
Mountain View |
CA |
US |
|
|
Assignee: |
Hansen Medical, Inc.
Mountain View
CA
|
Family ID: |
50277107 |
Appl. No.: |
13/835136 |
Filed: |
March 15, 2013 |
Current U.S.
Class: |
606/130 |
Current CPC
Class: |
A61B 34/37 20160201;
A61B 90/37 20160201; A61B 34/35 20160201; A61B 34/30 20160201; A61B
34/70 20160201; A61B 2034/301 20160201 |
Class at
Publication: |
606/130 |
International
Class: |
A61B 19/00 20060101
A61B019/00 |
Claims
1. A drive apparatus for an elongated member, comprising: a roller
assembly configured to impart axial motion to the elongate member;
and a roller support configured to rotate the roller assembly,
thereby imparting rotational motion to the elongate member; wherein
the roller assembly and roller support are configured to impart
axial and rotational motion independently of one another, such that
a first one of the roller assembly and the roller support imparts
their associated motion regardless of a presence or absence of
motion by the other of the roller assembly and the roller
support.
2. The drive apparatus of claim 1, further comprising a first
continuous surface defined by a generally cylindrical roller
included in the roller assembly.
3. The drive apparatus of claim 2, wherein the roller support is
configured to rotate about a second generally continuous
surface.
4. The drive apparatus of claim 1 wherein the roller assembly is
configured to maintain continuous grip of the elongate member in
the axial and rotational direction.
5. The drive apparatus of claim 1, further comprising a pair of
clamps selectively surrounding the roller assembly and the roller
support.
6. The drive apparatus of claim 5, wherein the clamps selectively
open to define a gap along an upper portion of the drive apparatus,
allowing the elongate member to be received through the gap and
within the rollers in a direction parallel to an axis of rotation
of the rollers.
7. The drive apparatus of claim 5, further comprising a driving
roller supported in a support plate defining a channel configured
to receive the elongated member when the elongated member is
disposed in the roller assembly, the driving roller configured to
rotate the clamps.
8. The drive apparatus of claim 5, further comprising a saddle
supporting the roller assembly within a housing defined by the pair
of clamps.
9. The drive apparatus of claim 1, wherein the roller assembly
includes a pair of opposing rollers.
10. The drive apparatus of claim 9, wherein the opposing rollers
are engaged via a plurality of mating teeth, thereby coordinating a
turning of the opposing rollers.
11. The drive apparatus of claim 5, further comprising a drive
pinion engaged with an inner toothed surface.
12. The drive apparatus of claim 11, wherein the drive pinion is
configured to rotate the first continuous surface about a
spindle.
13. The drive apparatus of claim 1, further comprising a drive
mechanism and a disposable portion including the roller assembly
and the roller support.
14. The drive apparatus of claim 13, wherein the drive mechanism
defines at least a portion of a sterile barrier with respect to the
disposable portion.
15. A drive apparatus for an elongated member, comprising: a roller
assembly configured to impart axial motion to the elongate member
along a first continuous surface configured to maintain contact
with the elongate member during axial motion; a roller support
configured to rotate the roller assembly, thereby imparting
rotational motion to the elongate member, the roller support
configured to rotate the roller assembly about a second continuous
surface configured to maintain contact with the roller support
during rotational motion; and a pair of clamps selectively
surrounding the roller assembly and the roller support; wherein the
roller assembly and roller support are configured to impart axial
and rotational motion independently of one another, such that a
first one of the roller assembly and the roller support imparts
their associated motion regardless of a presence or absence of
motion by the other of the roller assembly and the roller
support.
16. The drive apparatus of claim 15, wherein the first continuous
surface is defined by a generally cylindrical roller included in
the roller assembly.
17. The drive apparatus of claim 15, wherein the clamps selectively
open to define a gap along an upper portion of the drive apparatus,
allowing the elongate member to be received through the gap and
within the rollers in a direction parallel to an axis of rotation
of the rollers.
18. The drive apparatus of claim 15, further comprising a drive
pinion engaged with an inner toothed surface.
19. The drive apparatus of claim 18, wherein the drive pinion is
configured to rotate the first continuous surface about a
spindle.
20. The drive apparatus of claim 15, further comprising a drive
mechanism and a disposable portion including the roller assembly
and the roller support, wherein the drive mechanism defines at
least a portion of a sterile barrier with respect to the disposable
portion.
Description
BACKGROUND
[0001] Robotic interventional systems and devices are well suited
for performing minimally invasive medical procedures as opposed to
conventional techniques wherein the patient's body cavity is open
to permit the surgeon's hands access to internal organs. However,
advances in technology have led to significant changes in the field
of medical surgery such that less invasive surgical procedures, in
particular, minimally invasive surgery (MIS), are increasingly
popular.
[0002] MIS is generally defined as surgery that is performed by
entering the body through the skin, a body cavity, or an anatomical
opening utilizing small incisions rather than large, open incisions
in the body. With MIS, it is possible to achieve less operative
trauma for the patient, reduced hospitalization time, less pain and
scarring, reduced incidence of complications related to surgical
trauma, lower costs, and a speedier recovery.
[0003] Special medical equipment may be used to perform MIS
procedures. Typically, a surgeon inserts small tubes or ports into
a patient and uses endoscopes or laparoscopes having a fiber optic
camera, light source, or miniaturized surgical instruments. Without
a traditional large and invasive incision, the surgeon is not able
to see directly into the patient. Thus, the video camera serves as
the surgeon's eyes. The images of the interior of the body are
transmitted to an external video monitor to allow a surgeon to
analyze the images, make a diagnosis, visually identify internal
features, and perform surgical procedures based on the images
presented on the monitor.
[0004] MIS devices and techniques have advanced to the point where
an insertion and rolling motion of components of an elongated
component such as a catheter instrument, e.g., a catheter sheath
and associated guidewire, are generally controllable by selectively
operating rollers or other mechanisms for generally gripping the
component. Some known mechanisms use gripping devices capable of
infinite motion for translation, e.g., a roller, may require
complex catheter component loading procedures, or may not be
compatible with replaceable components adapted for a sterile
operating environment.
[0005] Accordingly, there is a need in the art for systems and
methods for inserting and rolling catheter components that address
or solve the above problems.
SUMMARY
[0006] An exemplary drive apparatus is disclosed having a roller
assembly configured to impart axial motion to the elongate member
along a first continuous surface configured to maintain contact
with the elongate member during axial motion. The drive apparatus
may further include a roller support configured to rotate the
roller assembly, thereby imparting rotational motion to the
elongate member. The roller support may be configured to rotate the
roller assembly about a second continuous surface configured to
maintain contact with the roller support during rotational motion.
Moreover, the roller assembly and roller support may be configured
to impart axial and rotational motion independently of one another,
such that a first one of the roller assembly and the roller support
imparts their associated motion regardless of a presence or absence
of motion by the other of the roller assembly and the roller
support.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] While the claims are not limited to the illustrated
embodiments, an appreciation of various aspects is best gained
through a discussion of various examples thereof. Referring now to
the drawings, illustrative embodiments are shown in detail.
Although the drawings represent the embodiments, the drawings are
not necessarily to scale and certain features may be exaggerated to
better illustrate and explain an innovative aspect of an
embodiment. Further, the embodiments described herein are not
intended to be exhaustive or otherwise limiting or restricting to
the precise form and configuration shown in the drawings and
disclosed in the following detailed description. Exemplary
embodiments of the present invention are described in detail by
referring to the drawings as follows.
[0008] FIG. 1 is an illustration of a robotically controlled
surgical system, according to one exemplary illustration;
[0009] FIG. 2 is an illustration of an exemplary catheter assembly
of the surgical system of FIG. 1;
[0010] FIG. 3 is another exemplary illustration of an exemplary
catheter assembly of the surgical system of FIG. 1;
[0011] FIG. 4 is a rear perspective view of an exemplary drive
apparatus for an elongated member, e.g., a guidewire for a
catheter;
[0012] FIG. 5 is a front perspective view of the exemplary drive
apparatus of FIG. 4;
[0013] FIG. 6 is a rear perspective view of the exemplary drive
apparatus of FIG. 4, with a support plate removed;
[0014] FIG. 7 is a rear perspective view of a disposable device for
the exemplary drive apparatus of FIG. 4, with the disposable device
in an open position;
[0015] FIG. 8 is a rear perspective view of the split clamp
assembly of FIG. 7, with the disposable device in a closed
position;
[0016] FIG. 9 is a front perspective view of the disposable device
of FIG. 7, with the disposable device in an open position and shown
without a split housing;
[0017] FIG. 10 is a rear perspective view of a drive mechanism for
the exemplary drive apparatus of FIG. 4;
[0018] FIG. 11 is a section view of the exemplary drive mechanism
taken through line 11-11 in FIG. 10;
[0019] FIG. 12A is a perspective view of another roller assembly
with an elongated member, according to an exemplary illustration;
and
[0020] FIG. 12B is a front perspective view of the exemplary roller
assembly of FIG. 12A.
DETAILED DESCRIPTION
[0021] Referring now to the drawings, illustrative embodiments are
shown in detail. Although the drawings represent the embodiments,
the drawings are not necessarily to scale and certain features may
be exaggerated to better illustrate and explain an innovative
aspect of an embodiment. Further, the embodiments described herein
are not intended to be exhaustive or otherwise limit or restrict
the invention to the precise form and configuration shown in the
drawings and disclosed in the following detailed description.
[0022] Referring to FIG. 1, a robotically controlled surgical
system 100 is illustrated in which an apparatus, a system, and/or
method may be implemented according to various exemplary
illustrations. System 100 may include a robotic catheter assembly
102 having a robotic or first or outer steerable complement,
otherwise referred to as a sheath instrument 104 (generally
referred to as "sheath" or "sheath instrument") and/or a second or
inner steerable component, otherwise referred to as a robotic
catheter or guide or catheter instrument 106 (generally referred to
as "catheter" or "catheter instrument"). Catheter assembly 102 is
controllable using a robotic instrument driver 108 (generally
referred to as "instrument driver"). During use, a patient is
positioned on an operating table or surgical bed 110 (generally
referred to as "operating table") to which robotic instrument
driver 108 may be coupled or mounted. In the illustrated example,
system 100 includes an operator workstation 112, an electronics
rack 114 and associated bedside electronics box (not shown), a
setup joint mounting brace 116, and instrument driver 108. A
surgeon is seated at operator workstation 112 and can monitor the
surgical procedure, patient vitals, and control one or more
catheter devices. Operator workstation 112 may include a computer
monitor to display a three dimensional object, such as a catheter
instrument or component thereof, e.g., a guidewire, catheter
sheath. Moreover, catheter instrument 502 may be displayed within
or relative to a three dimensional space, such as a body cavity or
organ, e.g., a chamber of a patient's heart. In one example, an
operator uses a computer mouse to move a control point around the
display to control the position of catheter instrument.
[0023] System components may be coupled together via a plurality of
cables or other suitable connectors 118 to provide for data
communication, or one or more components may be equipped with
wireless communication components to reduce or eliminate cables
118. Communication between components may also be implemented over
a network or over the interne. In this manner, a surgeon or other
operator may control a surgical instrument while being located away
from or remotely from radiation sources, thereby decreasing
radiation exposure. Because of the option for wireless or networked
operation, the surgeon may even be located remotely from the
patient in a different room or building.
[0024] Referring now to FIG. 2, an exemplary instrument assembly
200 is shown, including sheath instrument 104 and the associated
guide or catheter instrument 106 mounted to mounting plates 202,
204 on a top portion of instrument driver 108. During use, catheter
instrument 106 is inserted within a central lumen of sheath
instrument 104 such that instruments 104, 106 are arranged in a
coaxial manner. Although instruments 104, 106 are arranged
coaxially, movement of each instrument 104, 106 can be controlled
and manipulated independently. For this purpose, motors within
instrument driver 108 are controlled such that carriages coupled to
each of the instruments 104, 160 may allow the instruments 104, 106
to be driven forwards and backwards along the driver 108, e.g.,
with mounting plates securing the instruments to the driver 108 on
bearings. As a result, a catheter 300 coupled to guide catheter
instrument 106 and sheath instrument 104 can be controllably
manipulated while inserted into the patient, as will be further
illustrated. Additional instrument driver 108 motors (not shown in
FIG. 2) may be activated to control bending of the catheter as well
as the orientation of the distal tips thereof, including tools
mounted at the distal tip. Sheath catheter instrument 106 is
configured to move forward and backward for effecting an axial
motion of the catheter, e.g., to insert and withdraw the catheter
from a patient, respectively.
[0025] Referring now to FIG. 3, another exemplary instrument 109 is
illustrated mounted on theexemplary instrument driver 108. The
instrument 109 includes a cover 111 and a drive apparatus 400
partially extending out of the cover, as will be described further
in regard to FIGS. 4-11. More specifically, as will be described
further, the drive apparatus 400 may include a disposable portion
402 which extends out of the housing 111, while an associated drive
mechanism (not seen in FIG. 3) remains within the housing 111.
Accordingly, the drive mechanism (not shown in FIG. 3) may
generally be reused for surgical procedures, while the disposable
portion 402 may part of a sterile environment associated with a
surgical procedure and may be disposed of afterwards. Moreover, as
will be described further below the disposable portion 402 may be
formed of relatively cost-effective materials and may be of a
generally small relative size, minimizing a length of the elongate
member that must be allowed for the drive mechanism 400 to properly
"grip" the elongate member, and increasing cost-effectiveness of
the system 100 overall.
[0026] During use the instrument 109 may be used to manipulate an
elongate member included in the catheter assembly 102, e.g., a
catheter guidewire (not shown in FIG. 3). Alternatively, the
instrument 109 may be employed to manipulate a catheter sheath (not
shown in FIG. 3). Although a single instrument 109 is illustrated
in FIG. 3, in another exemplary illustration two instruments 109
may be employed in which a first instrument 109 is used to insert
and roll a guidewire, which guidewire is inserted within a central
lumen of a second instrument 109 (not shown in FIG. 3) such that
the two instruments 109 are arranged in a coaxial manner,
substantially as described above regarding the instruments 104,
106. Additionally, the instruments 109 may generally insert and
rotate the associated elongate member, i.e., the guidewire and
catheter sheath, independently, as described above regarding the
instruments 104, 106. Accordingly, while the exemplary
illustrations herein may generally focus on the insertion and
rotation of a guidewire for a catheter, the instrument 109 may be
used for insertion and rotation of any elongate member that is
convenient.
[0027] Turning now to FIGS. 4-11, exemplary drive apparatus 400 is
illustrated in further detail. As noted above, the drive apparatus
400 may include a disposable mechanism 402 for contacting and
driving an elongate member, e.g., a guidewire or catheter. An
associated drive mechanism 404 may generally be configured to be
kept separate from the disposable mechanism 402, at least to an
extent allowing the drive mechanism 404 to be kept out of a sterile
environment associated with the elongate member and surgical
procedure. As best seen in FIGS. 4-6, the disposable mechanism 402
may be supported between two idle rollers 421, 423, and a driving
roller 425 which is configured to rotate the disposable mechanism
402 to impart rotational motion to the elongate member, as will be
described further below. Moreover, the idle roller 421 may include
a driving gear 422 for selectively imparting axial motion, i.e.,
insertion or retraction, of an elongate member, as will also be
further described below.
[0028] The disposable portion 402 may include a roller assembly,
e.g., comprising one or more rollers 483 that are configured to
impart axial motion to the elongate member along a first continuous
surface. For example, as best seen in FIG. 9, a roller 483a and a
second roller 483b each define generally cylindrical surfaces 485a,
485b that are configured to maintain contact with the elongate
member during axial motion, i.e., caused by rotation of the rollers
483. The drive apparatus 400 may further include a roller support
configured to rotate the roller assembly, i.e., at least one of the
rollers 483, thereby imparting rotational motion to the elongate
member. For example, as will be described further below, the
rollers 483 may generally be supported within the clamps 401, 403
of the disposable portion, e.g., via a saddle 474 or by the clamps
401, 403 themselves, such that the rollers 483 may be rotated about
an axis defined by the elongate member. Moreover, the roller
support may be configured to rotate the roller assembly about a
second continuous surface configured to maintain contact with the
roller support during rotational motion, thereby permitting
generally any magnitude of rotational motion. Moreover, the roller
assembly and roller support may be configured to impart axial and
rotational motion independently of one another, such that a first
one of the roller assembly and the roller support imparts their
associated motion regardless of a presence or absence of motion by
the other of the roller assembly and the roller support. More
specifically, as will be described further below the rollers 483
may generally rotate about their respective spindles to provide
axial motion, regardless of whether the spindles themselves are
being rotated about the axis of the elongate member. It should be
noted that while one set of rollers 483 is shown, multiple sets of
rollers could be incorporated, e.g., in series, to provide
additional traction on the elongate member for axial and rotational
movement thereof.
[0029] Turning now to FIG. 7, the disposable drive mechanism 402
may include a left clamp 401 and a right clamp 403, as best seen in
FIG. 7. The left and right clamps 401, 403 may be connected to each
other with a compliant member 482 configured to maintain the left
and right clamps 401, 403 together in an open position as
illustrated in FIG. 7. More specifically, in the open position the
left and right clamps 401, 403 are held together along a lower
portion and are spaced apart by a gap G along an upper portion of
the clamps 401, 403. In one exemplary illustration, the compliant
member 482 includes first and second memory wires 482a, 482b, e.g.,
nitinol wires, which generally act similar to a spring in holding
the clamps together in the open configuration shown in FIG. 7. The
memory wires 482a, 482b may generally provide a locating feature
for the roller assembly, thereby generally positioning the rollers
483a, 483b within the clamps 401, 403, as best seen in FIG. 9.
[0030] Referring now to FIG. 9, the disposable mechanism 402 is
illustrated with the left and right clamps 401, 403 (not shown in
FIG. 9) removed. The disposable drive mechanism 402 includes a
roller assembly, e.g., having one or more rollers 483a, 483b for
imparting axial motion to the elongate member. As shown in FIG. 9,
two rollers 483a, 483b may be configured to receive an elongate
member (not shown in FIG. 9) therebetween. More specifically, the
rollers 483 may each rotate about corresponding spindles 484a,
484b. Moreover, as will be described further below the rollers
483a, 483b may each have a plurality of geared teeth 478a, 478b
which are meshingly engaged such that the rotation of the rollers
483a, 483b is generally coordinated. The rollers 483a, 483b may
each be generally round, thereby defining respective continuous
surfaces 485a, 485b about the generally cylindrical rollers 483 for
engaging the elongate member. More specifically, an axial movement
of any distance may be applied by the rollers 483a, 483b, since the
rollers 483a, 483b may continuously turn about the spindles 484
without limitation. Accordingly, axial motion of the elongate
member is not limited by any range of motion of any component of
the drive apparatus 400, allowing the drive apparatus 400 to
provide an axial movement in either direction of any magnitude
while maintaining constant contact with the elongate member, i.e.,
by way of the generally looped or continuous surfaces 485a, 485b of
the rollers 483a, 483b.
[0031] The roller assembly may be supported in a roller support
configured to rotate the rollers about an axis perpendicular to the
spindles 484 of the rollers 483. For example, the spindle 484a of
the roller 483a may be supported in a saddle 474 that is engaged
with an interior surface of one of the clamps 401, 403 (not shown
in FIG. 9) by way of a plurality of springs 473. Radially inward
movement of the saddle 474 away from the interior surface may be
limited by stop pins 475, which may engage an interior side of the
saddle 474 to generally limit radially inward movement of the
saddle 474 and the roller 483a, thereby limiting force applied by
the roller 483a to the elongate member when the elongate member is
positioned between the rollers 483a, 483b. The spindle 484b of the
other roller 483b may be supported in the corresponding one of the
clamps 401, 403 (not shown in FIG. 9). Accordingly, the spindle
484b may be generally fixed within the clamps 401, 403 while the
spindle 484a may be movable by way of the springs 473 to provide a
clamping force upon the elongate member.
[0032] The disposable device 402 may further comprise gear halves
426a, 426b which define an inner toothed surface 489 engaging a
drive pinion 477 (see FIGS. 7 and 8). The drive pinion 477 may be
engaged with a worm gear 479 by way of worm 480, wherein the worm
480 is fixed for rotation with the drive pinion 477. A location
shaft 481 may be provided to assist with locating the above
components within the clamps 401, 403, as will be described further
below. Additionally, a compliant element 482 may be provided which
generally provides a spring force urging the clamps 401, 403 toward
an open position, e.g., as seen in FIG. 7.
[0033] The driving mechanism 404, as best seen in FIGS. 10 and 11,
may include a front plate 451 having a channel 490 through which an
elongate member may be received during operation. The driving
mechanism may further include a right idle roll rotational assembly
452 which corresponds to right idle roller 423 (see FIGS. 4-6).
Additionally, a lever 453 is located on the front plate 451 by way
of a pivot shaft 460, about which the lever 453 may be pivoted by
way of a threaded member 454, which may be a driving screw. The
driving mechanism 404 may include driving shafts 455 and 456, which
may be received within corresponding drive mechanisms (not shown)
associated with the instrument driver 108 supporting the instrument
109 (see FIG. 3). A driving roll rotational assembly 457 supports
bevel gears 458 and 459, which are engaged to transfer rotational
motion of the driving shaft 456 to driving roller 425 (see FIGS. 4
and 5). A left idle roll bushing 461 and driving gear bushing 463
may be supported in a housing 462 mounted to the support plate 451,
as will be described further below.
[0034] The drive apparatus 400 may generally integrate a plurality
of actuating mechanisms together. The drive apparatus 400 may
include a mechanism for opening and closing to facilitate loading
and unloading of an elongate member, e.g., a guidewire or a
catheter. As will be described further below, the clamps 401, 403
may generally be opened to allow top loading of an elongate member,
and may thereby facilitate loading of the elongate member without
requiring threading the elongate member axially through the drive
apparatus 400. The drive apparatus may also include a mechanism for
inserting and retracting the elongate member, i.e., in an axial
direction. Moreover, the drive apparatus 400 also includes a
mechanism for imparting rotational motion to the elongate member.
Additionally, as will be described further below, the drive
apparatus 400 may provide axial motion and rotational motion
simultaneously, and in an "infinite" manner. More specifically, as
will be seen below the insertion and rotational motion is provided
by continuous drive surfaces, e.g., the generally round or looped
roller surfaces 485a, 485b and the toothed gear engagement between
the drive pinion 477 and gear halves 426a, 426b. Accordingly, a
generally continuous axial or rotational motion may be provided
without releasing the elongate member during the motion. In other
words, the rotational and insertion motions are not limited by any
range of motion of the drive apparatus 400 or components thereof.
Moreover, the rotational and axial motion may be provided
independent of the other, i.e., one of or both of the rotational
and axial motion may be applied to the elongate member at any given
time.
[0035] Referring now to FIGS. 6 and 7, the use and operation of the
drive apparatus 400 will be described in further detail. Initially
the drive apparatus 400 may be in the open position, i.e., where
the disposable portion 402 defines a gap G between the clamps 401,
403 as best seen in FIG. 7. While the disposable portion 402 is in
the open position, the elongate member, e.g., a guidewire or
catheter (not shown in FIG. 6 or 7), may be placed between the
rollers 483a, 483b supported from below by the compliant members
482. An end portion 425a of driving roller 425 (see FIG. 6), may be
located in the driving roll assembly 457 and can be moved up and
down by rotation of the lever 453, which rotates about the pivot
shaft 460, as best seen in FIG. 7. The lever 453 may be actuated by
threaded member 454. Accordingly, the driving roller 425 may
selectively open and close the disposable portion 402. More
specifically, when the driving roller 425 is in an upper position
as defined by the pivoting of the lever 453, the disposable portion
402 will be closed, as seen in FIG. 8. When the driving roller 425
is moved downward to a lower position, the driving roller 425
generally allows the compliant element 482 to urge the clamps 401,
403 apart at the upper portion, defining the gap G as best seen in
FIG. 7. Upon movement of the driving roller 425 upward, the
disposable portion 402 is forced to close. For example, an
engagement portion 425b of the driving roller 425 may come into
contact with one or both clamps 401, 403, thereby forcing the
clamps 401, 403 together at the upper portion, closing the gap G as
seen in FIG. 8.
[0036] Upon closure of the disposable portion 402, the elongate
member may be held between the rollers 483a, 483b with a force that
is generally limited by springs 473, as best seen in FIG. 9. More
specifically, the springs 483 may generally act upon an inner
surface of one of the clamps 401, 403 (not shown in FIG. 9), urging
the roller 483a which is supported in the saddle 474 toward the
other roller 483b. Accordingly, a desired force of the rollers
483a, 483b may be adjusted based upon the spring force imparted by
the springs 473.
[0037] Turning now to FIGS. 6 and 10, a rotational motion imparted
by the drive apparatus 400 to an elongate member will be described
in further detail. The roller 425 may be rotated via the shaft 456,
e.g., though bevel gears 458 and 459, as best seen in FIG. 10.
Rotation of the driving roller 425 in turn rotates the disposable
portion 402 via friction between the engagement portion 425b of the
roller 425 and an outer surface 402a of the disposable portion 402,
as best seen in FIG. 6. Motion may be imparted to the disposable
portion via other mechanisms as well. Merely as an example, motion
may be transferred from the roller 425 to the disposable portion
402 with a using corresponding toothed surfaces on the roller 425
and the disposable portion 402, similar to a geared
arrangement.
[0038] Turning now to FIGS. 9-11, the axial motion of the drive
apparatus 400 is described in further detail. FIG. 11 illustrates a
cross section of the holders for left idle roller 423 and driving
gear 422 (see FIG. 3). More specifically, left idle roll 423 is
located by bushing 461 and driving gear 422 is located by bushing
463. The bushing 463 may have a driving mechanism (not shown) for
selectively rotating the driving gear 422. Rotation of the driving
gear 422 (see FIG. 3), which is engaged with an outer toothed
surface of gear halves426a, 426b, will thereby rotate the gear
halves 426a, 426b. The gear halves 426a, 426b when in the closed
position (i.e., as in FIG. 8) may form a gear that rotates in
response to the driving gear 422 (see FIG. 6). The gear halves
426a, 426b in turnactuates gear 477 as best seen in FIGS. 7 and 8.
The gear 477 is located on the worm 480, as illustrated in FIG. 9.
Rotation of the worm 480 in turn drives worm gear 479. The worm
gear 479 actuates one of the rollers 483b. The other roller 483a
rotates in response to the roller 483b, as they are connected with
the corresponding gears478a, 478b. The surfaces485a, 485b of the
rollers 483a, 483b may generally be designed to ensure
substantially slipless contact with the elongate member, such that
the turning of the rollers 483a, 483b imparts axial motion directly
to the elongate member.
[0039] To enact simultaneous axial and rotational motion of the
elongate member, shaft 456 (see FIG. 10) and drive gear 422 (see
FIG. 6) may be driven simultaneously. Moreover, the instrument 109
may include interfaces for the shaft 456 and drive gear 422 that
allow for selective rotation of each, facilitating independent
axial and rotational motion. Rotational speeds of the components of
the drive apparatus 400 can be optimized as needed to suit any
given application, e.g., by altering the interfaces between the
various rotational parts, e.g., by adjusting the geared
arrangements to ensure reasonable rotational speeds of the
components based upon typical axial and rotational movement for the
given application.
[0040] Turning now to FIGS. 12A and 12B, another set of exemplary
rollers 783a, 783b is illustrated with an elongate member 999,
e.g., a guidewire. The rollers 783a, 783b may each define generally
cylindrical continuous surfaces 785a, 785b, and may rotate about
spindles 784a, 784b, e.g., similar to rollers 483a, 483b. Moreover,
the rollers 783a, 783b may each define a plurality of upper teeth
799a, 799b, as well as a plurality of lower teeth 789a, 798b. The
upper teeth 799a of the roller 783a may generally mesh with the
upper teeth 799b of the roller 783b, and the lower teeth 798a of
the roller 783a may generally mesh with the lower teeth 798b of the
roller 783b, thereby generally preventing an elongate member
received between the rollers 783a, 783b, e.g., guidewire 999, from
slipping out between the rollers 783a, 783b. Moreover, the upper
and lower teeth 799, 798 may still allow for top loading of an
elongate member such as the guidewire 999. For example, at least
one of the rollers 783a, 783b may be supported in a saddle, e.g.,
as described above regarding roller 483a, which allows enough
lateral displacement of the roller 783a or 783b to be moved to
temporarily open a gap between the upper teeth 799 through which
the elongate member can be laid between the rollers 783a, 783b.
[0041] Operator workstation 112, electronics rack 114 and/or drive
apparatus 400 may include a computer or a computer readable storage
medium implementing the operation of drive and implementing the
various methods and processes described herein, e.g., process 1300.
In general, computing systems and/or devices, such as the processor
and the user input device, may employ any of a number of computer
operating systems, including, but by no means limited to, versions
and/or varieties of the Microsoft Windows.RTM. operating system,
the Unix operating system (e.g., the Solaris.RTM. operating system
distributed by Oracle Corporation of Redwood Shores, Calif.), the
AIX UNIX operating system distributed by International Business
Machines of Armonk, N.Y., the Linux operating system, the Mac OS X
and iOS operating systems distributed by Apple Inc. of Cupertino,
Calif., and the Android operating system developed by the Open
Handset Alliance.
[0042] Computing devices generally include computer-executable
instructions, where the instructions may be executable by one or
more computing devices such as those listed above.
Computer-executable instructions may be compiled or interpreted
from computer programs created using a variety of programming
languages and/or technologies, including, without limitation, and
either alone or in combination, Java.TM., C, C++, Visual Basic,
Java Script, Perl, etc. In general, a processor (e.g., a
microprocessor) receives instructions, e.g., from a memory, a
computer-readable medium, etc., and executes these instructions,
thereby performing one or more processes, including one or more of
the processes described herein. Such instructions and other data
may be stored and transmitted using a variety of computer-readable
media.
[0043] A computer-readable medium (also referred to as a
processor-readable medium) includes any non-transitory (e.g.,
tangible) medium that participates in providing data (e.g.,
instructions) that may be read by a computer (e.g., by a processor
of a computer). Such a medium may take many forms, including, but
not limited to, non-volatile media and volatile media. Non-volatile
media may include, for example, optical or magnetic disks and other
persistent memory. Volatile media may include, for example, dynamic
random access memory (DRAM), which typically constitutes a main
memory. Such instructions may be transmitted by one or more
transmission media, including coaxial cables, copper wire and fiber
optics, including the wires that comprise a system bus coupled to a
processor of a computer. Common forms of computer-readable media
include, for example, a floppy disk, a flexible disk, hard disk,
magnetic tape, any other magnetic medium, a CD-ROM, DVD, any other
optical medium, punch cards, paper tape, any other physical medium
with patterns of holes, a RAM, a PROM, an EPROM, a FLASH-EEPROM,
any other memory chip or cartridge, or any other medium from which
a computer can read.
[0044] Databases, data repositories or other data stores described
herein may include various kinds of mechanisms for storing,
accessing, and retrieving various kinds of data, including a
hierarchical database, a set of files in a file system, an
application database in a proprietary format, a relational database
management system (RDBMS), etc. Each such data store is generally
included within a computing device employing a computer operating
system such as one of those mentioned above, and are accessed via a
network in any one or more of a variety of manners. A file system
may be accessible from a computer operating system, and may include
files stored in various formats. An RDBMS generally employs the
Structured Query Language (SQL) in addition to a language for
creating, storing, editing, and executing stored procedures, such
as the PL/SQL language mentioned above.
[0045] In some examples, system elements may be implemented as
computer-readable instructions (e.g., software) on one or more
computing devices (e.g., servers, personal computers, etc.), stored
on computer readable media associated therewith (e.g., disks,
memories, etc.). A computer program product may comprise such
instructions stored on computer readable media for carrying out the
functions described herein.
[0046] The drive apparatus 400 may advantageously use disposable
materials in the construction of the disposable mechanism 402,
e.g., an injection molded plastic material. Additionally, the
disposable mechanism is relatively short in an axial direction
associated with the elongate member, minimizing wasted length,
i.e., the portion of the elongate member that must be gripped or
held by the drive apparatus 400 during operation. The minimal
length of the drive apparatus 400 may generally be due in part to
the containment of the driving mechanisms of the disposable portion
402 within the clamps 401, 403. Additionally, the drive apparatus
employs separate driving mechanisms, e.g., rollers 483a, 483b and
the toothed gear engagement between the drive pinion 477 and gear
halves 426a, 426b, that allow for independent control of the axial
motion and rotational motion. Moreover, the drive apparatus
mechanism 400 provides generally "infinite" motion due to the
looped or round surfaces of the rollers 483a, 483b and the toothed
gear engagement between the drive pinion 477 and gear halves 426a,
426b, thereby allowing for application of any magnitude of axial or
rotational motion without having to release the elongate member.
Accordingly, axial and rotational motion of the elongate member are
not limited by any range of motion of the drive apparatus 400.
Finally, the split clamps 401, 403 of the disposable portion allows
for top loading of the elongate member, such that the elongate
member need not be threaded through the drive mechanism during
installation of the elongate member.
[0047] The exemplary illustrations are not limited to the
previously described examples. Rather, a plurality of variants and
modifications are possible, which also make use of the ideas of the
exemplary illustrations and therefore fall within the protective
scope. Accordingly, it is to be understood that the above
description is intended to be illustrative and not restrictive.
[0048] With regard to the processes, systems, methods, heuristics,
etc. described herein, it should be understood that, although the
steps of such processes, etc. have been described as occurring
according to a certain ordered sequence, such processes could be
practiced with the described steps performed in an order other than
the order described herein. It further should be understood that
certain steps could be performed simultaneously, that other steps
could be added, or that certain steps described herein could be
omitted. In other words, the descriptions of processes herein are
provided for the purpose of illustrating certain embodiments, and
should in no way be construed so as to limit the claimed
invention.
[0049] Accordingly, it is to be understood that the above
description is intended to be illustrative and not restrictive.
Many embodiments and applications other than the examples provided
would be upon reading the above description. The scope of the
invention should be determined, not with reference to the above
description, but should instead be determined with reference to the
appended claims, along with the full scope of equivalents to which
such claims are entitled. It is anticipated and intended that
future developments will occur in the arts discussed herein, and
that the disclosed systems and methods will be incorporated into
such future embodiments. In sum, it should be understood that the
invention is capable of modification and variation and is limited
only by the following claims.
[0050] All terms used in the claims are intended to be given their
broadest reasonable constructions and their ordinary meanings as
understood by those skilled in the art unless an explicit
indication to the contrary in made herein. In particular, use of
the singular articles such as "a," "the," "the," etc. should be
read to recite one or more of the indicated elements unless a claim
recites an explicit limitation to the contrary.
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