CA2846312A1 - Powered stapling apparatus - Google Patents

Powered stapling apparatus Download PDF

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Publication number
CA2846312A1
CA2846312A1 CA2846312A CA2846312A CA2846312A1 CA 2846312 A1 CA2846312 A1 CA 2846312A1 CA 2846312 A CA2846312 A CA 2846312A CA 2846312 A CA2846312 A CA 2846312A CA 2846312 A1 CA2846312 A1 CA 2846312A1
Authority
CA
Canada
Prior art keywords
assembly
resilient member
cartridge assembly
spring
microcontroller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA2846312A
Other languages
French (fr)
Inventor
Patrick Mozdzierz
Christopher Penna
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covidien LP
Original Assignee
Covidien LP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Covidien LP filed Critical Covidien LP
Publication of CA2846312A1 publication Critical patent/CA2846312A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B17/07207—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously the staples being applied sequentially
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/11—Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis
    • A61B17/115—Staplers for performing anastomosis in a single operation
    • A61B17/1155—Circular staplers comprising a plurality of staples
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
    • A61B2017/00398—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like using powered actuators, e.g. stepper motors, solenoids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214—Stapler heads
    • A61B2017/07271—Stapler heads characterised by its cartridge
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/06—Measuring instruments not otherwise provided for
    • A61B2090/064—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/06—Measuring instruments not otherwise provided for
    • A61B2090/064—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension
    • A61B2090/065—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension for measuring contact or contact pressure

Abstract

A stapler is provided. The stapler includes a handle assembly and a shaft extending distally from the handle assembly. A tool assembly is configured to selectively couple to the shaft and includes a cartridge assembly and an anvil assembly. The cartridge assembly includes a staple guide defining a tissue contacting surface. A resilient member operably positioned within the cartridge assembly is configured to bias the staple guide distally to provide a predetermined compressive force against tissue when the cartridge assembly and anvil are approximated toward one another.

Description

POWERED STAPLING APPARATUS
BACKGROUND
Technical Field [0001] The present disclosure relates to a powered stapling apparatus.
More particularly, the present disclosure relates to a powered stapling apparatus including a spring loaded cartridge assembly configured to provide a consistent and specific compressive force for stapling tissue.
Description of Related Art [0002] Powered staplers are known, as are their use in closed procedures, i.e., endoscopic, laparoscopic or through natural body orifices. The powered staplers may include a tool assembly that is configured to operably couple to a distal end of an elongate body that extends from a handle assembly. The handle assembly is reusable and the tool assembly is, typically, disposable. The tool assembly may include an anvil assembly and a cartridge assembly that houses one or more staples therein. In use, the anvil and cartridge assemblies are approximated toward one another and the staple(s) are ejected from the cartridge assembly into the anvil assembly to form the staple(s) in tissue.
[0003] A motor powered by one or more suitable power sources (e.g., battery, outlet, etc.) may be utilized to effectuate ejecting the staple(s). One or more safe guards are typically utilized to ensure that the motor does not draw too much current. For example, prior to ejecting the staple(s), a microcontroller may be provided in the handle assembly and utilized to measure the amount of current that is being drawn from the power source by the motor.
The tnicrocontroller utilizes this current measurement to ensure that the motor does not draw an excessive amount of current which could cause damage to one or more component of the circular stapler.
[0004] As noted above, the handle assembly may be reusable. In this respect, the handle may be sterilized and re-used. As can be appreciated, the handle assembly and/or operative components associated therewith that are operable to effectuate movement of the anvil and cartridge assemblies (e.g., gears, links, etc.) may become worn and/or compromised as a result of the sterilization process and/or prolonged use of the handle assembly; this may result in these components not functioning in a manner as intended.
[0005] Conventional microcontrollers may not be configured to or capable of testing increased or decreased operational efficacy of the handle assembly and/or operative components associated therewith to determine if the handle assembly and/or operative components associated therewith are in proper working order.
SUMMARY
[0006] As can be appreciated, a powered stapling apparatus that includes a spring loaded cartridge assembly configured to provide a consistent and specific compressive force for stapling tissue may prove useful in the surgical arena.
[0007] 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.

100081 An embodiment of the instant disclosure provides a circular stapler. The circular stapler can include a handle assembly. A shaft may extend distally from the handle assembly. A
tool assembly may be configured to selectively couple to the shaft and includes a cartridge assembly and an anvil assembly. The cartridge assembly may include a staple guide defining a tissue contacting surface. A resilient member may be operably positioned within the cartridge assembly and configured to bias the staple guide distally; this provides a predetermined compressive force against tissue when the cartridge assembly and anvil are approximated toward one another.
100091 The resilient member may couple to an underside of the tissue contacting surface of the staple guide. The resilient member may be a wave spring or a compression spring. The resilient member may be shaped to complement the tissue contacting surface of the staple guide.
The staple guide may be movable with respect the tool assembly along a longitudinal axis defined therethrough.
100101 A microcontroller may be configured to operably communicate with a motor, for example in the handle assembly (or shaft) and a power source that is configured to energize the motor. The microcontroller may be in operable communication with the cartridge assembly and configured to test a spring constant of the resilient member.
100111 The cartridge assembly may be configured to move through a test stroke for testing the spring constant of the resilient member. In this instance, the microcontroller may be configured to compare a tested spring constant with known spring constants compiled in a data look-up table that is stored in memory and accessible to the microcontroller.
Moreover, the microcontroller may control an amount of current that is supplied to the motor based on the tested spring constant of the spring.

[0012] An embodiment of the instant disclosure provides a tool assembly that is adapted to selectively couple to handle assembly. The tool assembly includes a cartridge assembly and an anvil assembly. The cartridge assembly includes a staple guide defining a tissue contacting surface and a plurality of staple retaining slots therein. A resilient member operably positioned within the cartridge assembly is configured to bias the staple guide distally;
this provides a predetermined compressive force against tissue when the cartridge assembly and anvil are approximated toward one another via the handle assembly.
[0013] The resilient member may couple to an underside of the tissue contacting surface of the staple guide. The resilient member may be a wave spring or a compression spring. The resilient member may be shaped to complement the tissue contacting surface of the guide. The staple guide may be movable with respect the tool assembly along a longitudinal axis defined therethrough.
[0014] An embodiment of the instant disclosure provides a method for stapling tissue. A
handle assembly and a tool assembly are provided. The tool assembly is configured to operably couple to the handle assembly and includes a cartridge assembly, an anvil assembly and a resilient member. A wave spring or compression spring may be utilized for the resilient member. The resilient member is operably positioned within the cartridge assembly and configured to bias a staple guide of the cartridge assembly distally to provide a predetermined compressive force against tissue. The tool assembly is coupled to the handle assembly. A test stroke for testing a spring constant of the resilient member is then performed. In this instance, an amount of current that is supplied to a motor of the handle assembly is adjusted based on the tested spring constant of the spring. The cartridge assembly and anvil are then approximated toward one another and tissue is stapled.

[0015] The handle assembly may be provided with a microcontroller that is configured to operably communicate with a motor, for example in the handle assembly and a power source may be configured to energize the motor. A tested spring constant may be compared with known spring constants compiled in a data look-up table that is stored in a memory and is accessible to the microcontroller. When the spring constant is above a predetermined threshold, the amount of current that is supplied to the motor may be increased. And, when the spring constant is below a predetermined threshold, the amount of current to the motor may be decreased.
BRIEF DESCRIPTION OF THE DRAWING
100161 The foregoing features of the invention will be more readily understood by reference to the following detailed description, taken with reference to the accompanying drawings, in which:
[0017] Fig. 1 is a perspective view of a handle assembly coupled to a circular tool assembly configured to perform circular anastomosis in accordance with an embodiment of the invention;
[0018] Fig. 2 is a partial, perspective view of a distal end of the circular tool assembly of Fig. 1 with parts separated in accordance with an embodiment of the invention;
and [0019] Fig. 3 is a partial, cut-away view of the distal end of the circular tool assembly in accordance with an embodiment of the invention.

DETAILED DESCRIPTION
[0020] Detailed embodiments of the present disclosure are disclosed herein; however, the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
[0021] In accordance with an embodiment of the invention, Fig. 1 illustrates a powered circular stapling apparatus, i.e., a stapler, shown generally as reference numeral 2. , Stapler 2 includes a housing or handle assembly 4 having an actuator 6 and an elongated member, e.g., a shaft 8, extending from handle assembly 4. A tool assembly 10 (e.g., a multi-use loading unit, "MULU") is configured to operably couple to a distal end of elongated member 8 and includes an end effector 12 at a distal en thereof. End effector 12 includes a shell assembly 14 that is configured to support a cartridge assembly 16 (Figs. 1 and 2). Cartridge assembly 16 includes a plurality of fasteners (not shown) and a corresponding plurality of pusher members (not shown) that are operatively coupled to the fastener(s). End effector 12 includes an anvil assembly 18 that is configured to releasably couple to tool assembly 10 and includes a plurality of staple forming pockets or depressions (not shown) that are configured to receive the corresponding fastener(s) therein when the fastener(s) are deployed from cartridge assembly 16.
[0022] Reference is made to U.S. Patent Application Serial No. 61/774,071, filed on March 7, 2013, entitled "CIRCULAR STAPLING DEVICE INCLUDING BUTTRESS
RELEASE MECHANISM;" U.S. Patent Application Serial No. 13/739,246, filed on January 11, 2013, entitled "Circular Stapling Instrument;" and U.S. Patent Application Serial No.

a 12/946,082, filed November 15, 2010, entitled "Adapters for Use Between Surgical Handle Assembly and Surgical End Effector."
[0023] Making reference to Fig. 2, cartridge assembly 16 includes a staple guide 17 defining a tissue contacting surface 22 and a plurality of slots 19, formed in tissue contacting surface 22, that are aligned with the fastener(s) and pusher(s) thereof. Slots 19 are aligned with the staple forming pockets on anvil assembly 18 and are configured to allow the fastener(s) to deploy from cartridge assembly 16 through tissue and into the staple forming pockets of anvil assembly 18.
[0024] As the fastener(s) engage the staple-forming pockets of anvil assembly 18, the fastener(s) is/are formed and fasten tissue closed or to adjacent tissue. In an embodiment of the invention, staple guide 17 is movable with respect tool assembly 10 along a longitudinal axis "A-A" defined through tool assembly 10.
[0025] As seen in Figs. 2 and 3, a circular lip or flange 23 may be provided on a bottom circumferential wall 29 provided beneath tissue contacting surface 22 and is configured to engage a circular lip or flange 25 that extends along an inner wall 27 of shell assembly 14. In the illustrated embodiment, staple guide 17 is non-removably coupled to shell assembly 14. In an embodiment, staple guide 17 may be configured to removably couple to shell assembly 14. In an . embodiment, flange 23 may be replaced with one or more relatively resilient fingers (not shown) that are configured to flex radially inwardly so as to allow a user to couple and uncouple staple guide 17 from shell assembly 14. In this coupled configuration, the resilient finger(s) may be accessible to a user such that a user may press the finger(s) inwardly to release cartridge assembly 16 from shell 14. In an embodiment, flange 23 may be replaced with one or more tabs or projections (not shown) extending radially outward from circumferential wall 29. In an =
embodiment, circular lip or flange 25 may be replaced with one or more tabs or projections (not shown) extending inwardly from inner wall 27 of shell assembly 14.
[0026] With continued reference to Figs. 2-3, cartridge assembly 16 includes a resilient member 20, e.g., a wave, compression, or coil, spring 21 (hereinafter spring 21). It is also envisioned that resilient member 20 may be any material capable of deforming under pressure or force and subsequently regaining its shape or part of its shape. Specifically, spring 21 is configured to bias tissue staple guide 17 of cartridge assembly 16 outwardly or distally so as to provide a predetermined compressive force against tissue when cartridge assembly 16 and anvil assembly 18 are approximated toward one another.
[0027] Prior to use, the handle assembly 4 and tool assembly 10 perform an empty calibration clamp stroke (e.g., with no tissue positioned between the cartridge assembly 16 and anvil assembly 18) to establish a needed clamping stroke of the cartridge assembly 16 and anvil assembly 18 (e.g., with tissue positioned between the cartridge assembly 16 and anvil assembly 18). In accordance with the instant disclosure, this calibration clamp stroke fully compress the spring 21, enabling the handle assembly 4 to correctly associate current to force regardless of the age or number of cycles of the components (e.g., adapters, gears, motor, etc) on the stapler 2 and utilized to fire the stapler 2. Upon clamping the stapler 2 on tissue, the spring 21 may be compressed partially or completely if the compressive forces exceed the spring force of the spring 21. In either instance, the stapler 2 would be capable of measuring the correct target compression of captured tissues to deliver a staple crimped to contain the optimally compressed tissue.
[0028] In an embodiment, spring 21 is seated around circumferential wall 29 and positioned between an underside 34 of tissue contacting surface 22 and a distal face 22 of shell 14. In an assembled configuration, spring 21 rests against underside 34 and distal face 22, as best seen in Fig. 3. In an embodiment, spring 21 extends entirely around circumferential wall 29.
In an embodiment, spring 21 extends only partially around circumferential wall 29. In an embodiment, spring 21 may be shaped (e.g., with a generally circular or curved configuration) to complement the circular configuration of tissue contacting surface 22 and circumferential wall 29 of cartridge assembly 16.
[0029] The spring 21 may disposed on or contained within other components that are configured to establish a compressive load on the tissue. For example, while the spring 21 has been described herein as being disposed within the cartridge assembly 16, the spring 21 may disposed on or contained in the anvil assembly 18, the handle assembly 4, tool assembly 10 and/or adapters (not shown) configured for use with the stapler 2.
[0030] With reference again to Fig. 1, a microcontroller 30 (shown in phantom) is configured to operably communicate with a motor 31 (shown in phantom) of handle assembly 4 and a power source 33 that is configured to energize motor 31. In embodiments, such as the illustrated embodiment, the microcontroller 30 may be housed within the handle assembly 4. In embodiments, the microcontroller 30 may be housed in the elongated member 8.
Power source 33 may be any suitable power source including but not limited to a battery (rechargeable and/or non-rechargeable) or AC wall outlet.
[0031] The gearing and/or motors in the handle assembly 4 and tool assembly 10 translate the motor's 31 power into torque. As noted above, with conventional staplers, many cycles of use, and the gearing and/or motors in the handle assembly and tool assembly may "wear in" resulting in increased efficiency of current to torque. As cycling continues one or more of the gearing and/or motors, may start to degrade in their performance showing a loss of efficiency. If the efficiency of the gearing changes, the current to pressure relationship, control of pressure may also change.
[0032] As can be appreciated, it may prove advantageous to monitor and control pressure at the tissue when tissue is being stapled. In accordance therewith, the spring 21 exhibits a constant and unchanging force curve regardless of the number of cycles.
Specifically, the handle assembly 4 monitors and controls current input into the motor 31. Thus, by calibrating the cartridge assembly 16 and anvil assembly 18 against the spring 21, the microcontroller 30 may set to a value of current that corresponds to a force of a spring constant to be the assigned value of the spring 21. Thus, when the stapler 2 is cycled through a clamping and stapling stroke, the current that the microcontroller is reading, monitoring, and controlling can be controlled for in terms of force as opposed to current.
[0033] Microcontroller 30 may be in operable communication with cartridge assembly 16 and configured to test a spring constant of spring 21. Specifically, microcontroller 30 may be configured to compare a tested spring constant with known spring constants that are compiled in one or more data look-up tables 36 and stored in memory 35 (shown in phantom) that is accessible by microcontroller 30. The known spring constants may be acquired through measurement of a range of different resilient members that may be utilized with cartridge assembly 16.
[0034] In embodiments, application software that is executable by the microcontroller 30 may be utilized to calculate a desired force. In such an embodiment, tool assembly 10 may include an identification chip or electrically erasable programmable read-only memory device (EEPROM) which will communicate with the microcontroller 30. Information on the tool assembly 10 may include, for example, staple sizes, tool assembly type, etc., and the spring =
type/load can be communicated to the handle assembly 4 to enable the application software to establish running parameters of current to actual forces. Additionally or alternatively, a separate spring loaded device (not explicitly shown) may be used to interpose between the anvil assembly 18 and a staple guide of the tool assembly 10 to establish the necessary force to current relationship.
[0035] In an embodiment, memory 35 may be a module or component of microcontroller 30. Memory 35 may be any suitable computer readable medium and may include both volatile and/or nonvolatile memory and data storage components. Memory 35 may include, for example, random access memory (RAM) and/or read-only memory (ROM). The RAM may include, for example, static random access memory (SRAM), dynamic random access memory (DRAM), or magnetic random access memory (MRAM) and other such devices. The ROM may include, for example, a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an EEPROM, and other like memory device.
[0036] One or more sensors 37 (or other suitable device(s)) may be operably coupled to spring 21 and are configured to measure a spring constant of spring 21 (Fig.
2). Sensor(s) 37 may be a force transducer, accelerometer, or other suitable sensor. In an embodiment, cable 39 (wire or the like) may extend through tool assembly 10 and may be configured to couple to a corresponding cable 41 (Fig. 1). Cable 41 extends through elongated shaft 8 and couples to microcontroller 30 for communication therewith.
[0037] In an embodiment, cartridge assembly 16 is configured to move through a test or calibration stroke for testing a spring constant of spring 21. Specifically, microcontroller 30 controls an amount of current that is supplied to motor 31 based on the tested spring constant of spring 21. More specifically, microcontroller 30 provides more current to motor 31 when the spring constant is above a predetermined threshold and provides less current to motor 31 when the spring constant is below a predetermined threshold.
[0038] In use, tool assembly 10 may be coupled to elongated shaft 8.
Thereafter, a test stroke for testing a spring constant of spring 21 may be performed. During the test stroke, anvil 18 is approximated a predetermined distance towards cartridge assembly 16 against the bias of spring 21. Subsequently, microcontroller 30 may utilize one or more suitable control algorithms to determine the spring constant of spring 21.
[0039] Thereafter, microcontroller 30 accesses data look-up table 36 in memory 33 and compares the determined spring constant with the known spring constants of data look-up table 36. Microcontroller 30 provides more current to motor 31 if the spring constant is above a predetermined threshold and provides less current to motor 31 if the spring constant is below a predetermined threshold.
[0040] As can be appreciated, utilization of microcontroller 30 and sensor 37 to determine a spring constant of spring 21 that is coupled to cartridge assembly 16 overcomes the aforementioned drawbacks that may be associated with conventional circular anastomosis staplers. Specifically, microcontroller 30, through the test or calibration stroke, can detect degradation of handle assembly 4 and/or operative components associated therewith. As can be appreciated, this may extend the operable shelf life of stapler 2 and/or tool assembly 10.
[0041] Thereafter, tissue can be positioned between the tissue contacting surface 22 of the cartridge assembly 16 and the anvil assembly 18 and then the anvil assembly 18 may be approximated towards the tissue contacting surface 22 of the cartridge assembly 16. Actuator 6 may then be actuated to staple the tissue.

[0042] Current stapling is done based upon experienced surgeons choosing a cartridge with a set staple height. Incorrect estimation of tissue thickness versus cartridge selection can lead to either: tissue insufficiently compressed leading to bleeding and/or dehiscence and leakages or over compressed tissue which may damage serosal/mucosal membranes and even potentials results in ischemic tissue.
[0043] In accordance with the instant disclosure, however, a predetermined clamping force is established to increase/decrease the clamping force of the cartridge assembly 16 and anvil assembly 18 that are holding tissue in place before staples are fired to maintain a specific clamping force. As can be appreciated, to be able to provide a surgeon with clamping information and suggested ranges, will enable the surgeon to use that information and, if need be, tweak compression between the cartridge assembly 16 and anvil assembly 18 prior to stapling tissue.
[0044] 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. For example, while the microcontroller 30, spring 21 and sensor 37 have been described herein configured for use with a circular stapler 2, the rnicrocontroller 30, spring 21 and sensor 37 may be configured for use with other types of staplers, e.g., linear stapling devices, etc.
[0045] 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.

Claims (22)

1. A stapler, comprising:
a handle assembly;
a shaft extending distally from the handle assembly;
a tool assembly configured to selectively couple to the shaft and including a cartridge assembly and an anvil assembly, the cartridge assembly including a staple guide defining a tissue contacting surface and a plurality of staple retaining slots therein; and a resilient member operably positioned within the cartridge assembly and configured to bias the staple guide distally to provide a predetermined compressive force against tissue when the cartridge assembly and anvil are approximated toward one another.
2. The stapler according to claim 1, wherein the resilient member couples to an underside of the tissue contacting surface of the staple guide.
3. The stapler according to claim 1 or 2 wherein the resilient member is one of a wave spring and a compression spring.
4. The stapler according to claim 1, 2 or 3 wherein the resilient member is shaped to complement the tissue contacting surface of the staple guide.
5. The stapler according to any one of claims 1 to 4, wherein at least one of the cartridge assembly and anvil assembly is circular.
6. The stapler according to any one of claims 1 to 5, wherein the staple guide is movable with respect the tool assembly along a longitudinal axis defined therethrough.
7. The stapler according to any one of claims 1 to 6, further including a microcontroller that is configured to operably communicate with a motor and a power source configured to energize the motor.
8. The stapler according to claim 7, wherein the microcontroller is operably positioned within at least one of the handle assembly and shaft.
9. The stapler according to claim 7 or 8, wherein the microcontroller is in operable communication with the cartridge assembly and configured to test a spring constant of the resilient member.
10. The stapler according to claim 9, wherein the cartridge assembly is configured to move through a test stroke for testing the spring constant of the resilient member.
11. The stapler according to any one of claims 7 to 10, wherein the microcontroller is configured to compare a tested spring constant with known spring constants that are stored in memory that is accessible to the microcontroller.
12. The stapler according to claim 11, wherein the microcontroller controls an amount of current that is supplied to the motor based on the tested spring constant of the resilient member.
13. A tool assembly adapted to selectively couple to a handle assembly, the tool assembly comprising:
a cartridge assembly and an anvil assembly, the cartridge assembly including a staple guide defining a tissue contacting surface and a plurality of staple retaining slots therein; and a resilient member operably positioned within the cartridge assembly and configured to bias the staple guide distally to provide a predetermined compressive force against tissue when the cartridge assembly and anvil are approximated toward one another via the handle assembly.
14. The tool assembly according to claim 13, wherein the resilient member couples to an underside of the tissue contacting surface of the staple guide.
15. The tool assembly according to claim 13 or 14, wherein the resilient member is one of a wave spring and a compression spring.
16 16. The tool assembly according to claim 13, 14 or 15, wherein the resilient member is shaped to complement the tissue contacting surface of the staple guide.
17. The tool assembly according to any one of claims 13 to 16, wherein the staple guide is movable with respect the tool assembly along a longitudinal axis defined therethrough.
18. A method for stapling tissue, the method comprising the steps of:
providing a handle assembly;
providing a tool assembly configured to operably couple to the handle assembly and including a cartridge assembly, an anvil assembly and a resilient member, the resilient member operably positioned within the cartridge assembly and configured to bias a staple guide of the cartridge assembly distally to provide a predetermined compressive force against tissue;
coupling the tool assembly to the handle assembly;
performing a test stroke for testing a spring constant of the resilient member;
adjusting an amount of current that is supplied to a motor of the handle assembly based on the tested spring constant of the spring;
approximating the cartridge assembly and anvil toward one another; and stapling tissue.
19. The method according to claim 18, including utilizing at least one of a wave spring and a compression spring for the resilient member.
20. The method according to claim 18 or 19, including the step of providing the handle assembly with a microcontroller that is configured to operably communicate with the motor and a power source configured to energize the motor.
21. The method according to claim 20, including the step of comparing a tested spring constant with known spring constants that are stored in a memory and accessible by the microcontroller.
22. The method according to claim 21, including the step of providing more current to the motor when the spring constant is above a predetermined threshold and providing less current to the motor when the spring constant is below a predetermined threshold.
CA2846312A 2013-03-14 2014-03-13 Powered stapling apparatus Abandoned CA2846312A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201361781487P 2013-03-14 2013-03-14
US61/781,487 2013-03-14
US14/197,817 2014-03-05
US14/197,817 US9592056B2 (en) 2013-03-14 2014-03-05 Powered stapling apparatus

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CA2846312A1 true CA2846312A1 (en) 2014-09-14

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CA2846312A Abandoned CA2846312A1 (en) 2013-03-14 2014-03-13 Powered stapling apparatus

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US (2) US9592056B2 (en)
EP (2) EP2792316B1 (en)
JP (1) JP6306380B2 (en)
CN (1) CN104042293B (en)
AU (1) AU2014201345B2 (en)
CA (1) CA2846312A1 (en)

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US20170135697A1 (en) 2017-05-18
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US9592056B2 (en) 2017-03-14

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