U.S. patent application number 14/808889 was filed with the patent office on 2015-11-19 for surgical forceps.
The applicant listed for this patent is COVIDIEN LP. Invention is credited to CHASE COLLINGS, GRANT T. SIMS, JEFFREY R. TOWNSEND.
Application Number | 20150327943 14/808889 |
Document ID | / |
Family ID | 47506858 |
Filed Date | 2015-11-19 |
United States Patent
Application |
20150327943 |
Kind Code |
A1 |
COLLINGS; CHASE ; et
al. |
November 19, 2015 |
SURGICAL FORCEPS
Abstract
A forceps includes a pair of shafts each having a jaw member
disposed at a distal end thereof. One (or both) of the shafts is
moveable relative to the other about a pivot pin between a
spaced-apart position and an approximated position to move the jaw
members between an open position and a closed position. A knife
assembly includes a knife blade mechanically keyed to the pivot pin
and moveable between an initial position, wherein the knife blade
is disposed within one of the jaw members, and an extended
position, wherein the knife blade extends between the jaw members.
An actuator arm(s) is mechanically keyed to the pivot pin and
extends therefrom. The actuator arm(s) is moveable between an
un-actuated position and an actuated position to rotate the pivot
pin relative to the jaw members to move the knife blade between the
initial position and the extended position.
Inventors: |
COLLINGS; CHASE; (HAYDEN,
ID) ; SIMS; GRANT T.; (LITTLETON, CO) ;
TOWNSEND; JEFFREY R.; (LONGMONT, CO) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
COVIDIEN LP |
Mansfield |
MA |
US |
|
|
Family ID: |
47506858 |
Appl. No.: |
14/808889 |
Filed: |
July 24, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14153346 |
Jan 13, 2014 |
9113937 |
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14808889 |
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13180018 |
Jul 11, 2011 |
8628557 |
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14153346 |
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Current U.S.
Class: |
606/207 |
Current CPC
Class: |
A61B 2018/0063 20130101;
A61B 18/085 20130101; A61B 90/06 20160201; A61B 90/02 20160201;
A61B 2018/1452 20130101; A61B 17/282 20130101; A61B 2562/0271
20130101; A61B 2562/0266 20130101; A61B 17/285 20130101; Y10T
29/49826 20150115; A61B 2017/2825 20130101; A61B 18/1442
20130101 |
International
Class: |
A61B 19/00 20060101
A61B019/00; A61B 17/285 20060101 A61B017/285; A61B 17/28 20060101
A61B017/28 |
Claims
1-20. (canceled)
21. A surgical instrument, comprising: an end effector including a
first cavity and a second cavity; a first optical fiber disposed
within the first cavity and configured to provide a first signal; a
second optical fiber disposed within the second cavity and
configured to provide a second signal; and a controller coupled to
the first and second fibers and configured to determine temperature
and strain of the end effector based on the first and second
signals, respectively.
22. The surgical instrument according to claim 21, wherein each of
the first and second optical fibers includes at least one Bragg
grating.
23. The surgical instrument according to claim 21, wherein the
first optical fiber is secured within the first cavity.
24. The surgical instrument according to claim 21, wherein the
second optical fiber is unsecured within the second cavity.
25. The surgical instrument according to claim 21, wherein the
first and second cavities contain a thermally and electrically
conductive material.
26. The surgical instrument according to claim 25, wherein the
electrically conductive material is saline.
27. The surgical instrument according to claim 21, wherein the
first optical fiber is configured to provide a first signal
including a first component corresponding to a temperature
measurement.
28. The surgical instrument according to claim 27, wherein the
second optical fiber is configured to provide a second signal
including a first component corresponding to the temperature
measurement and a second component corresponding to a strain
measurement, and the first component of the first signal is
substantially identical to the first component of the second
signal.
29. The surgical instrument according to claim 28, wherein the
controller is configured to determine the strain measurement by
removing the first component of the first signal from the second
signal.
30. The surgical instrument according to claim 21, wherein the end
effector includes a first jaw member and a second jaw member, at
least one of the first jaw member or the second jaw member
including the first and second cavities, the first and second jaw
members movable relative to one another between a first,
spaced-apart position and a second proximate position to grasp
tissue therebetween.
31. A surgical instrument, comprising: an end effector including a
first cavity and a second cavity; a first optical fiber unsecuredly
mounted within the first cavity and configured to provide a first
signal; a second optical fiber securedly mounted within the second
cavity and configured to provide a second signal; and a controller
coupled to the first and second fibers and configured to determine
temperature and strain of the end effector as a function of the
first and second signals.
32. The surgical instrument according to claim 31, wherein each of
the first and second optical fibers includes at least one Bragg
grating.
33. The surgical instrument according to claim 31, wherein the
first optical fiber is configured to provide a first signal
including a first component corresponding to a temperature
measurement.
34. The surgical instrument according to claim 33, wherein the
second optical fiber is configured to provide a second signal
including a first component corresponding to the temperature
measurement and a second component corresponding to a strain
measurement, and the first component of the first signal is
substantially identical to the first component of the second
signal.
35. The surgical instrument according to claim 34, wherein the
controller is configured to determine the strain measurement by
removing the first component of the first signal from the second
signal.
36. A method for determining temperature and strain of a surgical
end effector, comprising: detecting a first signal from a first
optical fiber unsecuredly mounted within a first cavity of a
surgical end effector; detecting a second signal from a second
optical fiber securedly mounted within a second cavity of the
surgical end effector; determining a temperature of the surgical
end effector based on the first signal; and determining strain of
the surgical end effector based on the first and second
signals.
37. The method according to claim 36, wherein detecting the first
signal includes: detecting a first component of the first signal
corresponding to a temperature measurement; and detecting a first
component of the second signal corresponding to the temperature
measurement and a second component of the second signal
corresponding to a strain measurement, the first component of the
first signal being substantially identical to the first component
of the second signal.
38. The method according to claim 37, further comprising removing
the first component of the first signal from the second signal to
determine the strain of the end effector.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation application of U.S.
patent application Ser. No. 14/153,346, filed on Jan. 13, 2014,
which is a continuation application of U.S. patent application Ser.
No. 13/180,018, filed on Jul. 11, 2011, the entire contents of each
of which are hereby incorporated herein by reference.
BACKGROUND
[0002] The present disclosure relates to a surgical forceps and,
more particularly, to a surgical forceps including replaceable jaw
members.
TECHNICAL FIELD
[0003] A forceps is a plier-like instrument which relies on
mechanical action between its jaws to grasp, clamp and constrict
vessels or tissue. Electrosurgical forceps utilize both mechanical
clamping action and electrical energy to affect hemostasis by
heating tissue and blood vessels to coagulate and/or cauterize
tissue. Certain surgical procedures require more than simply
cauterizing tissue and rely on the unique combination of clamping
pressure, precise electrosurgical energy control and gap distance
(i.e., distance between opposing jaw members when closed about
tissue) to "seal" tissue, vessels and certain vascular bundles.
Typically, once a vessel is sealed, the surgeon has to accurately
sever the vessel along the newly formed tissue seal. Accordingly,
many vessel sealing instruments have been designed which
incorporate a knife or blade member which effectively severs the
tissue after forming a tissue seal.
[0004] Generally, surgical instruments, including forceps, can be
classified as single-use instruments, e.g., instruments that are
discarded after a single use, partially-reusable instruments, e.g.,
instruments including both disposable portions and portions that
are sterilizable for reuse, and completely reusable instruments,
e.g., instruments that are completely sterilizable for repeated
use. As can be appreciated, those instruments (or components of
instruments) that can be sterilized and reused help reduce the
costs associated with the particular surgical procedure for which
they are used. However, although reusable surgical instruments are
cost-effective, it is important that these instruments be capable
of performing the same functions as their disposable counterparts
and that any disposable components of these instruments be
efficiently removable and replaceable with new components.
SUMMARY
[0005] In accordance with one embodiment of the present disclosure,
a forceps is provided, the forceps includes a pair of shaft members
each having a jaw member disposed at a distal end thereof. One (or
both) of the shaft members is moveable relative to the other about
a pivot pin between a spaced-apart position and a first
approximated position to move the jaw members between an open
position and a closed position. A knife assembly is also provided.
The knife assembly includes a knife blade and one or more actuator
arms. The knife blade is mechanically keyed to the pivot pin and
moveable between an initial position, wherein the knife blade is
disposed within one of the jaw members, and an extended position,
wherein the knife blade extends between the jaw members. The
actuator arm(s) are likewise mechanically keyed to the pivot pin
and extend therefrom. The actuator arm(s) is moveable between an
un-actuated position and an actuated position to rotate the pivot
pin relative to the jaw members to move the knife blade between the
initial position and the extended position.
[0006] In one embodiment, the actuator arm(s) is coupled to a
spring at an end thereof. The spring is moveable between an at-rest
position and an extended position to move the actuator arm(s)
between the un-actuated position and the actuated position, e.g.,
to move the knife blade between the initial position and the
extended position. More specifically, the spring may be configured
to move from the at-rest position to the extended position upon
movement of the shaft members to a second approximated position.
Further, the spring may be engaged to one of the shaft members at
an end thereof and to the actuator arm(s) at an opposite end
thereof.
[0007] In another embodiment, a first cam slot is defined within
one of the shaft members and a second cam slot is defined within
the actuator arm(s). A cam pin is disposed through each of the
first and second cam slots and is coupled to the distal end of the
spring, such that, upon movement of the shaft members to the second
approximated position, the spring is moved from the at-rest
position to the extended position to translate the cam pin along
the first and second cam slots, thereby moving the actuator arm(s)
to the actuated position, thus moving the knife blade to the
extended position. Further, the forceps may be configured such
that, upon movement of the shaft members to the second approximated
position, one of the shaft members contacts the spring and urges
the spring to move from the at-rest position to the extended
position.
[0008] In yet another embodiment, one (or both) of the jaw members
includes a jaw frame fixedly engaged to the respective shaft member
and a disposable jaw housing releasably engageable with the jaw
frame. Additionally, a seal plate may be releasably engaged to the
jaw housing. The seal plate may include a longitudinally-extending
blade channel defined therethrough. The blade channel is configured
to permit passage of the knife blade therethrough upon movement of
the knife blade from the initial position to the extended position.
Further, the seal plate may be adapted to connect to a source of
electrosurgical energy, e.g., for energizing the seal plate.
[0009] In still another embodiment, the jaw housing includes one or
more engagement features configured to releasably engage a
complementary engagement feature (or features) defined within the
jaw frame.
[0010] In still yet another embodiment, the shaft members, the
pivot pin, and the knife assembly are releasably engaged to one
another, e.g., such that the shaft members, the pivot pin and the
knife assembly may be assembled and disassembled by the user.
[0011] A method of assembling a forceps, e.g., the forceps
according to any of the embodiments discussed above, is also
provided in accordance with the present disclosure. The method
includes providing a pair of shaft members, each shaft member
having a jaw member disposed at a distal end thereof, providing a
pivot pin including first and second mechanical keying features,
and providing a knife assembly. The knife assembly includes a knife
blade having a first complementary mechanical keying feature and
one or more actuator arm(s) having a second complementary
mechanical keying feature. The method further includes pivotably
coupling the pivot pin to the shaft members such that the shaft
members are movable between a spaced-apart position and a first
approximated position to move the jaw members between an open
position and a closed position, engaging the first mechanical
keying feature of the pivot pin with the first complementary
mechanical keying feature of the knife blade, and engaging the
second mechanically keying feature of the pivot pin with the second
complementary mechanical keying feature of the actuator arm(s). As
such, when the forceps is assembled as described above, movement of
the actuator arm(s) from an un-actuated position to an actuated
position may be effected to rotate the pivot pin relative to the
jaw members, thereby moving the knife blade from an initial
position, wherein the knife blade is disposed within one of the jaw
members, to an extended position, wherein the knife blade is
extended between the jaw members.
[0012] In one embodiment, one (or both) of the jaw members includes
a jaw frame fixedly engaged to the respective shaft member and a
disposable jaw housing releasably engageable with the jaw frame. In
such an embodiment, the method may further include releasably
engaging the disposable jaw housing to the jaw frame.
[0013] In another embodiment, the method includes releasably
engaging a seal plate to the jaw housing. Further, the seal plate
may be connected to a source of electrosurgical energy, e.g., via
an electrosurgical cable.
[0014] In yet another embodiment, the method includes coupling a
proximal end of the actuator arm(s) to a proximal end of one of the
shaft members. More specifically, a cam pin may be inserted through
a first cam slot defined within one of the shaft members and
through a second cam slot defined within the actuator arm(s) to
couple the actuator arm(s) to the shaft member. Accordingly, upon
movement of the shaft members to a second approximated position,
the cam pin is translated along the first and second cam slots,
thereby moving the actuator arm(s) from the un-actuated position to
the actuated position, e.g., to move the knife blade from the
initial position to the extended position.
[0015] In still another embodiment, the method includes providing a
spring having a proximal end and a distal end, coupling the cam pin
to the distal end of the spring, and coupling the proximal end of
the spring to a proximal end of one of the shaft members. The
spring is configured for movement from an at-rest position to an
extended position upon movement of the shaft members to the second
approximated position to move the actuator arm(s) from the
un-actuated position to the actuated position, e.g., to move the
blade from the initial position to the extended position.
[0016] A method of assembling a jaw member is also provided in
accordance with the present disclosure. The jaw member to be
assembled may be any of the jaw members discussed above, e.g., a
jaw member including a jaw frame, a jaw housing, an insulator, and
an electrically-conductive seal plate. The method includes
positioning the seal plate about the insulator, slidably
positioning the jaw housing about the seal plate and the insulator
such that the jaw housing, the seal plate, and the insulator are
retained in fixed relation relative to one another, and releasably
engaging the jaw housing to the jaw frame to retain the jaw
housing, the seal plate, the insulator, and the jaw frame in fixed
relation relative to one another.
[0017] In one embodiment, jaw housing includes a track defined
therein. The seal plate includes a pair of wings configured to
slidably engage the track of the jaw housing to secure the seal
plate, the jaw housing, and the insulator to one another.
[0018] In another embodiment, the insulator is formed partially (or
entirely) from a resiliently compressible material. The insulator
is configured to be compressed from an initial state to a
compressed state upon positioning of the jaw housing about the seal
plate and the insulator. As such, the biasing force acting of the
insulator, e.g., biasing the insulator back toward the initial
state, frictionally retains the jaw housing, the seal plate, and
the insulator in fixed relation relative to one another, once the
jaw member is assembled.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Various embodiments of the subject instrument are described
herein with reference to the drawings wherein:
[0020] FIG. 1 is a front, perspective view of one embodiment of a
forceps provided in accordance with the present disclosure wherein
the forceps is shown in an open position;
[0021] FIG. 2 is a front, perspective view of the forceps of FIG. 1
shown in a closed position;
[0022] FIG. 3 is a greatly-enlarged, perspective view of the end
effector assembly of the forceps of FIG. 1;
[0023] FIG. 4 is a greatly-enlarged, perspective view of the end
effector assembly of the forceps of FIG. 1 showing a disposable
component positioned for engagement with one of the jaw members of
the end effector assembly;
[0024] FIG. 5 is an exploded, perspective view of the disposable
component of one of the jaw members of the forceps of FIG. 1;
[0025] FIG. 6 is a front, perspective view of the disposable
component of FIG. 5, shown as assembled;
[0026] FIG. 7 is an exploded, perspective view of the disposable
component of the other jaw member of the forceps of FIG. 1;
[0027] FIG. 8 is a front, perspective view of the disposable
component of FIG. 7, shown as assembled;
[0028] FIG. 9 is an exploded, perspective view of the forceps of
FIG. 1;
[0029] FIG. 10 is a perspective, longitudinal, cross-sectional view
of the end effector assembly of the forceps of FIG. 1 showing the
knife blade in an initial position;
[0030] FIG. 11 is a side, longitudinal, cross-sectional view of the
end effector assembly of the forceps of FIG. 1 showing the knife
blade in an extended position;
[0031] FIG. 12 is a side view of the forceps of FIG. 1 shown in the
open position;
[0032] FIG. 13A is a side view of the forceps of FIG. 1 shown in
the closed position, wherein the knife blade is in the initial
position;
[0033] FIG. 13B is a transverse, cross-sectional view of the
forceps of FIG. 1 shown in the closed position, wherein the knife
blade is in the initial position;
[0034] FIG. 14A is a side view of the forceps of FIG. 1 shown in
the closed position, wherein the knife blade is in the extended
position; and
[0035] FIG. 14B is a transverse, cross-sectional view of the
forceps of FIG. 1 shown in the closed position, wherein the knife
blade is in the extended position.
DETAILED DESCRIPTION
[0036] Embodiments of the present disclosure are described in
detail with reference to the drawing figures wherein like reference
numerals identify similar or identical elements. As used herein,
the term "distal" refers to the portion that is being described
which is further from a user, while the term "proximal" refers to
the portion that is being described which is closer to a user.
[0037] Referring initially to FIGS. 1 and 2, a forceps 10 is shown
including two elongated shafts 12a and 12b each having a distal end
14a and 14b and a proximal end 16a and 16b, respectively. An end
effector assembly 100 including opposing jaw members 110, 120, is
attached to distal ends 14a and 14b of shafts 12a and 12b,
respectively. Opposing jaw members 110 and 120 are pivotably
connected about a pivot pin 150 and are moveable relative to one
another between an open position (FIG. 1) and a closed position
(FIG. 2), upon movement of shaft members 12a and 12b between a
spaced-apart position (FIG. 1) and a first approximated position
(FIG. 2), for grasping tissue therebetween. Further, each jaw
member 110, 120 includes a disposable component 210, 220,
respectively, that is releasably engaged thereon. Although forceps
10 is shown as an open surgical forceps, jaw members 110, 120
including disposable components 210, 220, respectively, may
similarly be configured for use with an endoscopic surgical forceps
(not shown).
[0038] With continued reference to FIGS. 1 and 2, each shaft 12a
and 12b includes a handle 17a and 17b disposed at the proximal end
16a and 16b thereof. Each handle 17a and 17b defines a finger hole
18a and 18b therethrough for receiving a finger of the user. As can
be appreciated, finger holes 18a and 18b facilitate movement of
shafts 12a and 12b relative to one another which, in turn, pivots
jaw members 110 and 120 between the open position (FIG. 1) and the
closed position (FIG. 2), wherein the jaw members 110 and 120
cooperate to grasp tissue therebetween. Further, as will be
described in greater detail below, shafts 12a, 12b are moveable
between a spaced-apart position (FIG. 1), a first approximated
position for closing jaw members 110, 120 to grasp tissue
therebetween (FIG. 2), and a second approximated position for
advancing knife blade 261 of knife assembly 260 (FIGS. 9-11)
between jaw members 110, 120 to cut tissue grasped therebetween
(FIGS. 14A-14B).
[0039] A ratchet 30 may be included for selectively locking jaw
members 110, 120 relative to one another at various positions
during pivoting. The ratchet 30 may include graduations or other
visual markings that enable the user to easily and quickly
ascertain and control the amount of closure force between the jaw
members 110 and 120.
[0040] Turning now to FIGS. 3-4, in conjunction with FIGS. 1 and 2,
and as mentioned above, forceps 10 includes a pair of jaw members
110, 120. Jaw members 110, 120 each include a disposable component
210, 220 that is releasably engageable with a jaw frame 112, 122,
respectively. Jaw frames 112, 122 of jaw members 110, 120,
respectively, are fixedly engaged to the respective shafts 12a,
12b, e.g., each jaw frame 112, 122 is formed as a single component
with the respective shaft 12a, 12b. Disposable components 210, 220,
are removeable from jaw frames 112, 122, respectively, and are
replaceable with new disposable components 210, 220, e.g.,
disposable components are configured to be discarded and replaced
after a single use (or a single procedure), while shafts 12a, 12b
and their respective jaw frames 112, 122, are formed from a
sterilizable material, e.g., stainless steel, such that they may be
sterilized, e.g., placed in an autoclave, after each procedure for
repeated use. As will be described in greater detail below, forceps
10 further includes a disposable knife assembly 260 (see FIG. 9)
that is releasably engageable therewith (although knife assembly
260 may alternatively be configured as a sterilizable and, thus,
reusable component). As can be appreciated, requiring only a new
set of disposable components 210, 220 and knife assembly 260 (FIG.
9), rather than an entire new surgical instrument, helps reduce the
equipment costs associated with performing a particular surgical
procedure.
[0041] With reference now to FIGS. 5-6, disposable component 210 of
jaw member 110 will be described. Disposable component 210
generally includes an insulative jaw housing 211, an insulator 215,
and an electrically-conductive tissue sealing plate 219. Jaw
housing 211 defines a generally horseshoe or U-shaped configuration
forming an elongated aperture 214 extending longitudinally at least
partially therethrough. As will be described in greater detail
below, knife blade 261 of knife assembly 260 (FIGS. 9-10) is
configured for positioning within elongated aperture 214 of jaw
housing 211 when in an initial position. Knife blade 261 (FIGS.
9-10) is moveable from the initial position within jaw housing 211
to an extended position, wherein knife blade 261 extends between
jaw members 110, 120 to cut tissue grasped therebetween. Jaw
housing 211 is further configured to mechanically engage insulator
215 and tissue sealing plate 219, e.g., in slidable snap-fit
engagement therewith, although other mechanisms (not shown) for
releasably securing jaw housing 211 about insulator 215 and tissue
sealing plate 219 may be provided. The assembly of the disposable
components 210, 220 of jaw members 110, 120, respectively, will be
described in greater detail below.
[0042] Continuing with reference to FIGS. 5-6, jaw housing 211
includes one or more engagement features, e.g., flexible, snap-fit
protrusions 212, extending therefrom and configured to releasably
engage jaw housing 211 to jaw frame 112 of jaw member 110 (see FIG.
10). More specifically, flexible, snap-fit protrusions 212 of jaw
housing 211 are configured for insertion through
complementary-shaped apertures 113 defined within jaw frame 112
(see FIG. 10) such that jaw housing 211 may be releasably secured
to jaw frame 112. Further, protrusions 212 disposed on jaw housing
211 may be longitudinally and laterally offset relative to one
another such that tilting, rotating, or other movement of
disposable component 210 relative to jaw frame 112 is substantially
inhibited once disposable component 210 is engaged to jaw frame
112.
[0043] Jaw frame 112, as best shown in FIGS. 13B and 14B, and as
will be described in greater detail below, may include a blade slot
116 defined therein and extending longitudinally therealong. Blade
slot 116 is configured to align with elongated aperture 214 of jaw
housing 211 upon engagement of jaw housing 211 to jaw frame 112 and
is similarly configured to permit positioning of knife blade 261 of
knife assembly 260 therein when knife blade 261 is disposed in the
initial position. Accordingly, when knife blade 261 is moved from
the initial position to the extended position, knife blade 261
extends through blade slot 116 of jaw frame 112 and through
elongated aperture 214 of jaw housing 211 such that knife blade 261
is extended between jaw members 110, 120 to cut tissue grasped
therebetween.
[0044] During assembly, as best shown in FIGS. 5-6 and 10,
flexible, snap-fit protrusions 212 of jaw housing 211 are aligned
with apertures 113 of jaw frame 112. Next, jaw housing 211 and jaw
frame 112 are approximated relative to one another until tabs 213
disposed on the free ends of flexible, snap-fit protrusions 212 of
jaw housing 211 snap into engagement with notches 114 defined
within the interior surfaces of apertures 113 of jaw frame 112. An
audible and/or tactile "snap," or other feedback signal, may be
provided to alert the user that jaw housing 211 has been securely
engaged within jaw frame 112.
[0045] In order to disengage jaw housing 211 from jaw frame 112,
jaw housing 211 and jaw frame 112 are pulled apart from one another
with sufficient force such that tabs 213 of flexible snap-fit
protrusions 212 of jaw housing 211 are disengaged from notches 114
of apertures 113 of jaw frame 112, allowing jaw housing 211 to be
removed from jaw frame 112. Similarly as described above, an
audible and/or tactile "snap," or other feedback signal, may alert
the user that jaw housing 211 has been disengaged from jaw frame
112.
[0046] Referring once again to FIGS. 5-6, insulator 215 is formed
at least partially from an electrically-insulative material and is
configured to electrically isolate tissue sealing plate 219 from
the remaining components of jaw member 110. Insulator 215 is
slidably disposable within jaw housing 211 and is configured to
mechanically engage tissue sealing plate 219 thereon. Similar to
jaw frame 112 and jaw housing 211, insulator 215 also includes a
blade channel 216 extending longitudinally therethrough to permit
passage of knife blade 261 (see FIGS. 13B and 14B). Proximal base
217 of insulator 215 is configured to abut the proximal end of
tissue sealing plate 219 to retain tissue sealing plate 219 in
position within jaw housing 211 once insulator 215 and tissue
sealing plate 219 have been slidably engaged therein. Additionally,
insulator 215 may be formed at least partially from a compressible
material, e.g., silicon, that is compressed upon insertion of
insulator 215 into jaw housing 211 such that insulator 215 and
tissue sealing plate 219 may be frictionally retained within jaw
housing 211.
[0047] Electrically-conductive tissue sealing plate 219, as
mentioned above, is disposed about insulator 215. Tissue sealing
plate 219 includes a lateral flange 231 extending therefrom that is
configured to electrically connect tissue sealing plate 219 to a
source of electrosurgical energy such as an electrosurgical
generator (not shown), e.g., via an electrosurgical cable (not
shown). As will be described in greater detail below, disposable
component 220 of jaw member 120 may similarly include an
electrically-conductive tissue sealing plate 229 (see FIGS. 7-8)
such that electrosurgical energy may be selectively supplied to
either or both of the electrically conductive tissue sealing plates
219, 229 of disposable components 210, 220 of jaw members 110, 120,
respectively, to seal tissue grasped between jaw members 110 and
120. Further, either (or both) of tissue sealing plates 219, 229
may include lateral flanges 231, 233, respectively, configured to
connect tissue sealing plates 219, 229 to a source of energy to
supply energy thereto. Alternatively, other suitable mechanisms
(not shown) for electrically coupling tissue sealing plates 219,
229 to a source of energy may be provided.
[0048] With continued reference to FIGS. 5-6, tissue sealing plate
219 of disposable component 210 of jaw member 110 may include a
longitudinally-extending blade channel 235 defined therein. Blade
channel 235 is configured to align with blade channel 216 defined
within insulator 215, elongated aperture 214 defined within jaw
housing 211, and blade slot 116 defined within jaw frame 112 to
permit passage of knife blade 261 of knife assembly 260 (see FIGS.
13B and 14B) therethrough upon movement of knife blade 261 from the
initial position (FIG. 13A) to the extended position (FIG. 13B).
Blade channel 235 may further be configured to facilitate and/or
enhance cutting of tissue upon extension of knife blade 261
therethrough.
[0049] Continuing with reference to FIGS. 5-6, disposable component
210 of jaw member 110 may come preassembled, e.g., jaw housing 211,
insulator 215 and tissue sealing plate 219 may be engaged to one
another during manufacturing, or may be configured to be assembled
by the user. In either embodiment, disposable component 210 and/or
the sub-components thereof (e.g., jaw housing 211, insulator 215
and/or tissue sealing plate 219) may define various configurations
such that the user may select a particular disposable component 210
(or sub-component thereof) suitable for the particular surgical
procedure to be performed. For example, different disposable
components 210 (or the subcomponents thereof) may be configured to
define various dimensions, may be formed from various materials,
and/or may have various other features to facilitate mechanical,
electrical, or frictional tissue dissection and/or tissue sealing
of a wide range of tissue sizes and compositions. Other variations
are also contemplated. Put more generally, the interchangeability
of different disposable components 210 configured for use with
forceps 10 permits the user to customize forceps 10 for use in a
wide-range of surgical procedures by selecting a particular
disposable component 210 (or subcomponent thereof) suitable for the
particular surgical procedure. As can be appreciated, such a
configuration reduces the overall number of different surgical
instruments needed to perform a wide-range of surgical procedures,
thereby helping to reduce overall equipment costs, which, in turn,
helps reduce the costs associated with each surgical procedure.
[0050] Turning now to FIGS. 7-8, disposable component 220 of jaw
member 120 will be described. Disposable component 220 of jaw
member 120 is similar to disposable component 210 of jaw member 110
and includes an insulative jaw housing 221, an insulator 225, and a
tissue sealing plate 229. Jaw housing 221 is configured to
mechanically engage insulator 225 and tissue sealing plate 229 in
slidable snap-fit engagement therewith, although other mechanisms
(not shown) are contemplated. Similar to jaw housing 211, jaw
housing 221 includes one or more flexible, snap-fit protrusions 222
configured to releasably engage jaw housing 221 to jaw frame 122 of
jaw member 120 (see FIG. 10). An audible and/or tactile "snap," or
other feedback signal, may be provided to alert the user as to the
engagement (or disengagement) of jaw housing 221 and jaw frame
122.
[0051] With continued reference to FIGS. 7-8, insulator 225 is
similar to insulator 215 of disposable component 210 of jaw member
110 (see FIGS. 5-6) and is formed at least partially from an
electrically-insulative material that is configured to electrically
isolate tissue sealing plate 229 from the remaining components of
jaw member 120. Insulator 225 is slidably disposable within jaw
housing 221 and is configured to mechanically engage tissue sealing
plate 229 thereon. When disposable component 220 is assembled,
proximal base 227 of insulator 225 abuts the proximal end of tissue
sealing plate 229 to retain tissue sealing plate 229 in position
within jaw housing 221. Similarly as discussed above with regard to
disposable component 210 (FIGS. 5-6), insulator 225 may be formed
at least partially from a compressible material, e.g., silicon,
such that insulator 225 and tissue sealing plate 229 may be
frictionally retained within jaw housing 221.
[0052] As shown in FIGS. 7-8, tissue sealing plate 229 is
configured to sit atop insulator 225 and to mechanically engage jaw
housing 221. More specifically, with tissue sealing plate 229
disposed about insulator 225, insulator 225 and tissue sealing
plate 229 may be sildably positioned within jaw housing 221. Upon
slidable positioning of insulator 225 and tissue sealing plate 229
within jaw housing 221, proximal base 227 of insulator 225 may be
configured to snap-fittingly engage jaw housing 221 to securely
retain insulator 225 within jaw housing 221, while proximal base
227 of insulator 225 abuts the proximal end of tissue sealing plate
229 to retain tissue sealing plate 229 in position within jaw
housing 221. Additionally, insulator 225 may be formed at least
partially from a compressible material to frictionally engage jaw
housing 221, insulator 225 and tissue sealing plate 229 of
disposable component 220 to one another.
[0053] Tissue sealing plate 229 may further include a
longitudinally-extending blade channel 237 defined at least
partially therethrough that permits extension of knife blade 261 of
knife assembly 260 therethrough (see FIG. 10) upon extension of
knife blade 261 to the extended position. Blade channel 237 may be
configured to facilitate and/or enhance cutting of tissue during
extension of knife blade 261 therethrough (FIG. 10). As discussed
above, tissue sealing plate 229 may also include a lateral flange
233 adapted to connect tissue sealing plate 229 to a source of
electrosurgical energy for energizing tissue sealing plates 219,
229 of jaw members 110, 120, respectively.
[0054] Jaw housing 221, insulator 225, and/or tissue sealing plate
229 may otherwise be configured similarly to jaw housing 211,
insulator 215, and tissue sealing plate 219, respectively, of
disposable component 210 of jaw member 110, discussed above (see
FIGS. 5A-5C). Further, although jaw frame 112 and disposable
component 210 are shown configured to retain knife blade 261 of
knife assembly 260 (FIGS. 9-10) therein when knife blade 261 is
disposed in the initial position, this configuration may be
reversed, e.g., such that jaw frame 122 and disposable component
220 of jaw member 120 are configured to retain knife blade 261 of
knife assembly 260 therein (FIGS. 9-10).
[0055] Similar to disposable component 210, discussed above,
disposable component 220 may come preassembled, e.g., disposable
component 220 may be assembled during manufacturing, or may be
configured to be assembled by the user. In either embodiment,
similarly as discussed above, disposable component 220 and/or the
sub-components thereof (e.g., jaw housing 221, insulator 225 and/or
tissue sealing plate 229) may define various configurations such
that the user may select a particular disposable component 220 (or
sub-component thereof) suitable for the particular surgical
procedure to be performed.
[0056] Turning now to FIGS. 9-11, in conjunction with FIGS. 1 and
2, knife assembly 260 will be described. Knife assembly 260 is
configured for releasable coupling to forceps 10 such that a user
may assemble, disassemble, and reassemble forceps 10, e.g., to
sterilize the reusable portions and replace the disposable portions
of forceps 10 in preparation for reuse of forceps 10. However,
forceps 10, including knife assembly 260, may also be configured as
a fully-assembled instrument, e.g., where forceps 10 is permanently
assembled at the time of manufacturing.
[0057] As best shown in FIG. 9, knife assembly 260 generally
includes a knife blade 261, one or more actuator arms 262, e.g.,
two actuator arms 262, and a spring-cam mechanism 280 (FIGS. 1-2).
As shown in FIG. 9, knife assembly 260 includes two actuator arms
262 positioned on either side of shaft 12a, although only one
actuator arm 262 need be provided. Actuator arms 262 are coupled to
knife blade 261 via pivot pin 150, such that, as will be described
in greater detail below, movement of actuator arms 262 between an
un-actuated position (FIG. 13A) and an actuated position (FIG. 14A)
rotates pivot pin 150 relative to jaw members 110, 120 to move
knife blade 261 between the initial position (FIG. 13B) and the
extended position (FIG. 14B).
[0058] Referring again to FIGS. 9-11, in conjunction with FIGS. 1
and 2, actuator arms 262 extend proximally from pivot pin 150 along
shaft 12a (although actuator arms 262 may alternatively be
configured to extend along shaft 12b). More specifically, each
actuator arm 262 includes a distal aperture 268 defined therein for
engaging pivot pin 150 therethrough. As best shown in FIG. 12,
pivot pin 150 and actuator arms 262 each define complementary
mechanical keying features, e.g., notches 152 and protrusions 269,
respectively, configured to engage one another such that rotation
of actuator arms 262 about pivot pin 150 effects similar rotation
of pivot pin 150 relative to jaw members 110, 120 of end effector
assembly 100. As shown in the Figures, pivot pin 150 includes
notches 152 defined within an outer peripheral surface thereof,
each notch 152 is configured for engaging a complementary-shaped
protrusion 269 of each actuator arm 262, which extend inwardly into
distal apertures 268 of actuator arms 262. However, the number,
size, shape and/or configuration of the complementary mechanical
keying features of pivot pin 150 and actuator arms 262 may be
varied so long as pivot pin 150 and actuator arms 262 are engaged
to one another such that rotation of actuator arms 262 about pivot
pin 150 effects similar rotation of pivot pin 150 relative to jaw
members 110, 120 of end effector assembly 100.
[0059] With continued reference to FIGS. 9-11, and in particular to
FIG. 9, knife blade 261 of knife assembly 260 likewise includes a
mechanical keying feature, e.g., protrusion 264, extending into a
proximal aperture 263 thereof for engaging a complementary
mechanical keying feature, e.g., notch 154, of pivot pin 150 upon
insertion of pivot pin 150 through proximal aperture 263 of knife
blade 261. Similarly as discussed above, due to the
mechanically-keyed engagement between protrusion 264 of knife blade
261 and notch 154 of pivot pin 150, rotation of pivot pin 150
relative to jaw members 110, 120 effects similar rotation of knife
blade 261 about pivot pin 150. As such, with actuator arms 262 and
pivot pin 150 mechanically-keyed to one another, and with pivot pin
150 and knife blade 261 mechanically-keyed to one another, actuator
arms 262 may be rotated about pivot pin 150, e.g., between the
un-actuated position (FIG. 13A) and the actuated position (FIG.
14A), to rotate knife blade 261 about pivot pin 150 and relative to
jaw members 110, 120, e.g., between the initial position (FIG. 13B)
and the extended position (FIG. 14B). As will be described in
greater detail below, during assembly, actuator arms 262 and knife
blade 261 are configured to be engaged to pivot pin 150 such that
the initial position of knife blade 261, e.g., wherein knife blade
261 is disposed within jaw member 110, corresponds to the
un-actuated position of actuator arms 262.
[0060] Referring momentarily to FIGS. 1-2, although pivot pin 150
is configured to engage knife blade 261 and actuator arms 262 of
knife assembly 260 in mechanically-keyed engagement, pivot pin 150
need not be mechanically-keyed to shafts 12a, 12b. In other words,
shafts 12a and 12b are free to pivot relative to one another about
and relative to pivot pin 150 between the spaced-apart position and
the first approximated position for moving jaw members 110, 120
between the open and closed positions for grasping tissue
therebetween, while knife blade 261 and actuator arms 262 of knife
assembly 260 remain disposed in the initial and un-actuated
positions, respectively. As will be described in greater detail
below, shafts 12a, 12b may then be moved to the second approximated
position to move actuator arms 262 to the actuated position to
rotate pivot pin 150 relative to jaw members 110, 120 and to
thereby move knife blade 261 from the initial position to the
extended position to cut tissue grasped between jaw members 110,
120. Alternatively, pivot pin 150 may be mechanically-keyed to one
or both of jaw members 110, 120 such that moving shafts 12a, 12b
between the spaced-apart and approximated positions closes jaw
members 110, 120 to grasp tissue and, thereafter, extends knife
blade 261 therebetween to cut tissue.
[0061] Turning once again to FIGS. 9-11, in conjunction with FIGS.
1-2, actuator arms 262 of knife assembly 260 each define an angled
proximal portion 265 that includes an angled cam slot 266 defined
therein and extending therealong. Further, one of the shafts, e.g.,
shaft 12a, includes a pair of substantially parallel cam slots 13a
defined therein and extending longitudinally therealong adjacent to
cam slots 266 of actuator arms 262. More particularly, cam slots
13a of shaft 12a are mis-aligned, or angled relative to cam slots
266 of actuator arms 262 such that the respective cam slots 13a,
266 intersect one another at an intersection position 285 (see
FIGS. 13A and 14A).
[0062] Continuing with reference to FIGS. 1-2 and 9-11, knife
assembly 260 further includes a leaf spring 281, or other biasing
member, defining an arch-shaped configuration when at-rest.
Proximal end 283 of leaf spring 281 is engaged to shaft 12a and
arches therefrom toward shaft 12b before arching back toward shaft
12a to distal end 282 of leaf spring 281. Distal end 282 of leaf
spring 281 is coupled to a cam pin 284 that is removably engageable
within cam slots 13a, 266, of shaft 12a and actuator arms 262,
respectively. As can be appreciated, with cam pin 284 disposed
through both cam slots 13a of shaft 12a and cam slots 266 of
actuator arms 262, the position of cam pin 284 corresponds to the
intersection position 285 of shaft 12a and actuator arms 262.
[0063] Initially, as shown in FIGS. 1-2 and FIG. 13A, cam pin 284
is retained at proximal ends 15a, 267 of cam slots 13a, 266,
respectively, under the bias of leaf spring 281. In this position,
actuator arms 262 are disposed in the un-actuated position. As will
be described in greater detail below, as leaf spring 281 is urged
from the arched-configuration toward a relatively linear
configuration, e.g., upon movement of shafts 12a, 12b to the second
approximated position (FIG. 14A), distal end 282 of leaf spring 281
is urged distally along shaft 12a such that cam pin 284 is
translated along cam slots 13a, 266 of shaft 12a and actuator arms
262, respectively. As such, due to the angled configuration of cam
slot 266 of actuator arms 262 relative to cam slots 13a of shaft
12a, translation of cam pin 284 along cam slots 13a, 266, of shaft
12a and actuator arms 262, respectively, urges actuator arms 262 to
rotate about pivot pin 150 and relative to shaft member 12a from
the un-actuated position toward the actuated position (see FIG.
14A).
[0064] Referring now to FIGS. 1-11, the assembly of forceps 10 will
be described. As mentioned above, forceps 10 may be configured to
be assembled, disassembled, and reassembled by the user. More
particularly, forceps 10 may be configured such that shafts 12a,
12b are sterilizable and reusable, while the remaining components
of forceps 10 are disposable after a single use (although some of
these components may also be configured as reusable components).
Accordingly, since the user is required to discard the old
components, sterilize or otherwise prepare the reusable components
for reuse, and reload forceps 10 with new disposable components,
forceps 10 is configured to be readily assembled and disassembled
by a user, as will become more apparent in view of the following.
Further, although the follow description by necessity recites the
assembly steps of forceps 10 in a particular order, it is
envisioned that the following assembly steps of forceps 10 be
performed in any suitable order.
[0065] With continued reference to FIGS. 1-11, and with reference
to FIG. 9 in particular, in order to assemble forceps 10, proximal
end 283 of leaf spring 281 is engaged with shaft 12a toward
proximal end 16a thereof. More particularly, proximal end 283 of
leaf spring 281 may be frictionally engaged within a recess (not
explicitly shown) defined between proximal end 16a of shaft 12a and
handle 17a or may be secured to shaft 12a in any other suitable
fashion such that proximal end 283 of leaf spring 281 is releasably
engageable in a fixed position relative to shaft 12a.
[0066] Next, cam pin 284 is coupled to distal end 282 of leaf
spring 281, e.g., cam pin 284 is inserted through an aperture 286
defined within distal end 282 of leaf spring 281, and is inserted
through cam slots 13a, 266, of shaft 12a and actuator arms 262,
respectively. Any suitable engagement mechanism (not shown) for
securing cam pin 284 within aperture 286 and cam slots 13a, 266 may
be provided, e.g., end caps (not shown) may be releasably
positioned on opposite ends of cam pin 284.
[0067] Next, pivot pin 150 is inserted into position. In order to
pivotably engage pivot pin 150 within apertures 19a, 19b, of shafts
12a, 12b, respectively, and to mechanically-key pivot pin 150 in
engagement with actuator arms 262 and knife blade 261, distal
apertures 268 of actuator arms 262, proximal aperture 262 of knife
blade 261 and apertures 19a, 19b of shafts 12a, 12b, respectively,
are aligned with one another with knife blade 261 of knife assembly
260 disposed within jaw member 110 in the initial position, as
discussed above. Next, pivot pin 150 is inserted through the
aligned apertures.
[0068] More specifically, pivot pin 150 is first inserted through
aperture 19b of shaft 12b. Next, pivot pin 150 is inserted through
proximal aperture 263 of knife blade 261 such that the
complementary mechanical keying features thereof engage one
another. Pivot pin 150 is thereafter advanced through aperture 19a
of shaft 12a. Finally, actuator arms 262 are positioned about pivot
pin 150 on opposite sides thereof such that actuator arms 262 and
pivot pin 150 are engaged in a mechanically-keyed relation relative
to one another, as discussed above.
[0069] The different mechanical keying features of pivot pin 150
corresponding to knife blade 261 and actuator arms 262 are
positioned relative to one another such that, upon assembly of
forceps 10, knife blade 261 is initially disposed in the initial
position, and such that actuator arms 262 are initially disposed in
the un-actuated position, both under the bias of leaf spring 281
(which is disposed in the at-rest, or arched position). Visual
markings or other indicia (not shown) may be provided to ensure the
proper orientation and/or position of knife blade 261 and actuator
arms 262 relative to pivot pin 150 and relative to each other such
that this initial position is achieved upon assembly of forceps 10.
Alternatively, or additionally, the mechanical keying features of
actuator arms 262, knife blade 261, and/or pivot pin 150 may be
configured such that pivot pin 150 may only be engaged with knife
blade 261 and/or actuator arms 262 in the proper initial
orientation and position, thereby helping to ensure proper assembly
of forceps 10.
[0070] With reference to FIGS. 5-6, the assembly of disposable
component 210 of jaw member 110 will be described. As discussed
above, disposable component 210 generally includes insulative jaw
housing 211, insulator 215, and electrically-conductive tissue
sealing plate 219. First, as best shown in FIG. 5, tissue sealing
plate 219 is positioned on insulator 215. More particularly, tissue
sealing plate 219 is positioned on top of insulator 215
longitudinally between proximal base 217 of insulator 215 and
distal lip 218 of insulator 215 and such that lateral wings 232 of
tissue sealing plate 219 surround the longitudinal sides of
insulator 215. As such, tissue sealing plate 219 and insulator 215
are retained in fixed longitudinal position relative to one another
via proximal base 217 and distal lip 218 and are retained in fixed
lateral position relative to one another via lateral wings 232 of
tissue sealing plate 219.
[0071] With tissue sealing plate 219 disposed about insulator 215,
as described above, tissue sealing plate 219 and insulator 215 are
slidably engaged within jaw housing 211. More particularly, tissue
sealing plate 219 and insulator 215 are slid distally into
engagement with track 238 defined within jaw housing 211 from the
proximal end of jaw housing 211 to the distal end of jaw housing
211 until tissue sealing plate 219 and insulator 215 are
substantially fully disposed within jaw housing 211. Upon insertion
of tissue sealing plate 219 and insulator 215, distal lip 218 of
insulator 215 may be configured to engage an interior surface of
track 238, while proximal base 217, as mentioned above, may be
configured to snap-fittingly engage jaw housing 211. Further, in
this configuration, tissue sealing plate 219 is inhibited from
being lifted, or disengaged from jaw housing 211 via the engagement
of lateral wings 232 within track 238 of jaw housing 211. In other
words, jaw housing 211 secures insulator 215 and tissue sealing
plate 219 therein. Additionally, or alternatively, as mentioned
above, insulator 215 may be formed from a resiliently compressible
material that is compressed, e.g., from an initial state to a
compressed state, in order to allow insulator 215 and tissue
sealing plate 219 to be slidably inserted through track 238 of jaw
housing 211. Accordingly, once insulator 215 and tissue sealing
plate 219 are disposed within jaw housing 211, insulator 215,
tissue sealing plate 219, and jaw housing 211 are frictionally
secured to one another under the bias of insulator 215, e.g., as
insulator 215 attempts to resiliently returned to the initial,
non-compressed state.
[0072] Referring now to FIGS. 7-8, disposable component 220 of jaw
member 120 is assembled similarly to disposable component 210 of
jaw member 110. More particularly, tissue sealing plate 229 is
first positioned on top of insulator 225 between proximal base 227
and distal lip 228 of insulator 225 and such that lateral wings 236
of tissue sealing plate 229 surround the longitudinal sides of
insulator 225. Next, tissue sealing plate 229 and insulator 225 are
slid distally into engagement with track 239 defined within jaw
housing 221 until tissue sealing plate 229 and insulator 225 are
disposed within jaw housing 221. Once positioned within jaw housing
221, distal lip 228 of insulator 225 may be configured to engage an
interior surface of track 239 and/or proximal base 227 of insulator
225 may be configured to snap-fittingly engage jaw housing 221,
while lateral wings 236 of tissue sealing plate 229 are engaged
within track 239 of jaw housing 221. Additionally, or
alternatively, as mentioned above, insulator 225 may be formed from
a resiliently compressible material to further secure the
components of disposable component 220 to one another.
[0073] As can be appreciated, the above-described configuration of
disposable components 210, 220 of jaw members 110, 120,
respectively, obviates the need to overmold, machine, or otherwise
form the components of jaw members 110, 120 to one another, thus
allowing an end user to assemble and disassemble jaw members 110,
120 without the need for specialized equipment.
[0074] With disposable components 210, 220 of jaw members 110, 120
fully assembled, as described above, disposable components 210, 220
may be snap-fittingly engaged to their respective jaw frames 112,
122, to complete the assembly of forceps 10. Alternatively, either
(or both) of the jaw housings 211, 221 may be configured for
slidable positioning about the respective insulator 215, 225 and
tissue sealing plate 219, 229, as well as the respective jaw frame
112, 122, to secure the respective disposable component 210, 220 to
the corresponding jaw frame 112, 122 (as opposed to the
snap-fitting arrangement discussed above). In other words, the
insulators 215, 225 and tissue seal plates 219, 229 may first be
positioned on the jaw frames 112, 122, respectively, with the
respective jaw housing 211, 221 subsequently slide-fit thereabout
to secure the respective insulators 215, 225, tissue sealing plates
219, 229, and jaw frames 112, 122 of each jaw member 110, 120 to
one another.
[0075] Turning now to FIGS. 12-14B, the use and operation of
forceps 10 will be described. Initially, the reusable portion(s) of
forceps 10, e.g., shafts 12a, 12b, are sterilized and/or otherwise
prepared for use (or reuse). Next, forceps 10 is assembled as
described above. At this point (or prior to), an electrosurgical
energy source (not shown) may be coupled to tissue sealing plate
219 and/or tissue sealing plate 229 of jaw members 110, 120,
respectively, e.g., via an electrosurgical cable (not shown)
coupled at a first end to the energy source (not shown) and at a
second end to lateral flange 231 and/or lateral flange 233 of
tissue sealing plates 219, 229, respectively (see FIGS. 5-8).
However, the electrical connection(s) may alternatively be
configured to run through either of shafts 12a, 12b, or may
otherwise be configured to supply energy to tissue sealing plates
219, 229 via any other suitable mechanism. With forceps 10 fully
assembled (and with the electrical connections intact), forceps 10
is ready for use.
[0076] Referring to FIG. 12, shafts 12a and 12b are moved to the
spaced-apart position such that jaw members 110, 120, disposed at
distal ends 14a, 14b, of shafts 12a and 12b, respectively, are
moved to the open position. At this point, leaf spring 281 is
disposed in the at-rest position, cam pin 284 is disposed at the
proximal ends 15a, 267 of cam slots 13a, 266, respectively,
actuator arms 262 are disposed in the un-actuated position, and
knife blade 261 is disposed in the initial position. With jaw
members 110, 120 disposed in the open position, as shown in FIG.
12, forceps 10 may be manipulated into position such that tissue to
be grasped, sealed and/or divided is disposed between jaw members
110, 120.
[0077] Once tissue is positioned as desired, shafts 12a and 12b may
be moved toward one another, e.g., to the first approximated
position, to pivot jaw members 110, 120 about pivot pin 150 toward
the closed position to grasp tissue between tissue sealing plates
219, 229 of disposable components 210, 220, of jaw members 110, 120
respectively, as shown in FIG. 13A. Shafts 12a and 12b may be
approximated relative to one another to selectively engage ratchet
30 such that the user may control the closure force applied to
tissue grasped between jaw members 110, 120. Next, the user may
selectively apply electrosurgical energy to electrically-conductive
tissue sealing plates 219 and 229 of jaw members 110 and 120,
respectively, to seal tissue grasped between jaw members 110,
120.
[0078] Referring now to FIGS. 13A-13B, although shafts 12a, 12b
have been moved to the first approximated position to move jaw
members 110, 120 to the closed position to grasp tissue between
sealing plates 219, 229, respectively, thereof, at this point, leaf
spring 281 remains disposed in the at-rest position, cam pin 284
remains disposed at the proximal ends 15a, 267 of cam slots 13a,
266, actuator arms 262 remain disposed in the un-actuated position,
and knife blade 261 remains disposed in the initial position.
[0079] When it is desired to cut tissue grasped between jaw members
110, 120, shafts 12a, 12b are moved closer to one another, e.g.,
toward the second approximated position. As shafts 12a, 12b are
moved toward the second approximated position, the ratchet 30 is
moved to an over-extended position wherein the teeth of ratchet 30
no longer engage one another, e.g., such that shaft members 12a,
12b are thereafter continuously movable to the second approximated
position. Eventually, upon translation of shafts 12a, 12b toward
the second approximated position, shaft 12b contacts the
arch-shaped leaf spring 281. Upon further approximation of shafts
12a, 12b, shaft 12b urges leaf spring 281 from the arch-shaped
configuration to a relatively linear-shaped configuration. In other
words, shaft 12b urges the apex of arch-shaped leaf spring 281
toward shaft 12a such that the distal end 282 of leaf spring 281
and, thus, cam pin 284 which is coupled thereto, are urged
distally.
[0080] As cam pin 284 is urged distally through cam slots 13a, 266,
of shaft 12a and actuator arms 262, respectively, actuator arms 262
are rotated about pivot pin 150 relative to shaft 12a and end
effector assembly 100 from the un-actuated position (FIG. 13A) to
the actuated position (FIG. 14A), due to the angled, or mis-aligned
positioning of cam slots 266 of actuator arms 262 relative to cam
slots 13a of shaft 12a. As shown in FIGS. 14A-14B, as actuator arms
262 are rotated about pivot pin 150 to the actuated position, pivot
pin 150 is rotated due to the mechanical-keying engagement
therebetween and, in turn, knife blade 261 is rotated due to the
mechanical-keying engagement between knife blade 261 and pivot pin
150. More specifically, as best shown in FIG. 14B, knife blade 261
is rotated from the initial position within jaw member 110 to the
extended position, wherein knife blade 261 extends between jaw
members 110, 120, e.g., through blade slot 116 defined within jaw
frame 112, elongated aperture 214 defined within jaw housing 211,
blade channel 216 defined within insulator 215, and blade channel
235 of tissue sealing plate 219, to cut tissue grasped
therebetween. Ultimately, once shafts 12a, 12b reach the second
approximated position, knife blade 261 may be configured to extend
completely through tissue and into blade channel 237 defined within
tissue sealing plate 229 of jaw member 120.
[0081] Once tissue has been grasped, sealed and/or divided, jaw
members 110, 120 may be returned to the open position, e.g., via
moving shafts 12a, 12b back to the spaced-apart position, to
release the sealed and divided tissue. As shafts 12a, 12b are
returned to the spaced-apart position, shaft 12b is moved apart
from leaf spring 281, allowing leaf spring 281 to return to its
at-rest position. As leaf spring 281 is returned to its at-rest
position, cam pin 284 is translated proximally such that actuator
arms 262 are rotated back to the un-actuated position and such that
knife blade 261 is returned to the initial position. Once jaw
members 110, 120 have been moved to the open position to release
tissue, forceps 10 may be removed from the surgical site.
[0082] At the completion of the surgical procedure, disposable
components 210, 220 may be removed from jaw frames 112, 122 of jaw
members 110, 120, respectively, and discarded. Additionally,
forceps 10 may be further disassembled, e.g., knife assembly 260
may be removed and discarded, such that the remaining components of
forceps 10 may be sterilized for reuse. Thereafter, forceps 10 may
be reassembled with new disposable components 210, 220 and a new
knife assembly 260 for subsequent use.
[0083] From the foregoing and with reference to the various figure
drawings, those skilled in the art will appreciate that certain
modifications can also be made to the present disclosure without
departing from the scope of the same. While several embodiments of
the disclosure have been shown in the drawings, it is not intended
that the disclosure be limited thereto, as it is intended that the
disclosure be as broad in scope as the art will allow and that the
specification be read likewise. Therefore, the above description
should not be construed as limiting, but merely as exemplifications
of particular embodiments. Those skilled in the art will envision
other modifications within the scope and spirit of the claims
appended hereto.
* * * * *