CN116999109A

CN116999109A - Surgical instrument

Info

Publication number: CN116999109A
Application number: CN202210476340.6A
Authority: CN
Inventors: 孙宝峰; 刘炳华; 刘向海; 魏海洲
Original assignee: Fengh Medical Co ltd
Current assignee: Fengh Medical Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-11-07
Also published as: WO2023208235A1

Abstract

The invention discloses a surgical instrument, which comprises a first mechanism, a second mechanism and a transmission piece, wherein the first mechanism comprises a clutch assembly and an output piece, the output piece is connected with the transmission piece, the clutch assembly is connected or coupled with the output piece, and in response to the coupling of the first mechanism and the transmission piece, the second mechanism drives the transmission piece to move back to a first initial position, and meanwhile, the transmission piece drives the output piece to return to a second initial position.

Description

Surgical instrument

Technical Field

The invention relates to the technical field of medical instruments, in particular to a surgical instrument.

Background

The anastomat suitable for the surgical operation is a surgical cutting anastomat which can cut off redundant tissues while suturing wounds of patients, and is widely applied to tissue cutting and anastomosis in minimally invasive operations such as abdominal surgery, gynecology, pediatrics, chest surgery and the like. Surgical cutting staplers sever and staple tissue by accessing a patient through a cannula of a penetrator that is precisely positioned at a surgical site, then making a longitudinal incision in the tissue and applying staples on opposite sides of the incision. The anastomat comprises a jaw assembly, wherein the jaw assembly comprises a nail bin seat and a nail propping seat, and the nail bin seat is used for receiving the nail bin assembly; the nail bin assembly comprises a nail bin body and a plurality of staples arranged in the nail bin body, wherein the nail bin body is internally provided with a plurality of staples used for containing the staples, the nail bin body comprises a top end face, and a staple outlet formed by the staples penetrating through the top end face is formed in the top end face.

Once the surgeon determines that the end effector is clamping the target tissue, the surgical cutting stapler can be fired to sever and staple the tissue. When stapling, the top end surface contacts the tissue to be stapled, and a cutting member in the surgical cutting stapler pushes a wedge-shaped staple pushing piece in the staple cartridge to move, so that a staple driver drives staples in the staple cartridge to move upwards from the staple cavities to pierce and staple target tissue (i.e. staples out).

The anastomat is provided with a first mechanism, the first mechanism drives the jaw transmission assembly to drive the jaw assembly to open or close through driving the cutting knife transmission assembly to move to drive the cutting knife assembly to move in the jaw assembly, and the anastomat has a certain sequence of working modes, namely, the first mechanism drives the jaw transmission assembly to enable the jaw assembly to be closed, then drives the transmission piece of the cutting knife transmission assembly to move, enables the transmission piece at a first initial position to move forward to drive the cutting knife assembly to move forward to a far end position, drives the transmission piece to retract to the first initial position, drives the cutting knife assembly to return to the initial position, and finally drives the jaw transmission assembly to enable the jaw assembly to open. However, when the driving transmission member of the existing first mechanism moves towards the first initial position, the driving transmission member cannot be driven to retract to the first initial position, and thus faults such as failure of the surgical instrument are caused. Therefore, improvements are needed.

Disclosure of Invention

In view of the deficiencies of the prior art, the present invention is directed to a surgical instrument.

The invention is realized by the following technical scheme:

a surgical instrument comprising a first mechanism comprising a clutch assembly and an output member, the clutch assembly being engaged or coupled with the output member, the output member being connected with the drive member, the drive member having a first initial position, the output member having a second initial position, the output member being in the second initial position when the drive member is in the first initial position, the clutch assembly being engaged with the output member to drive the drive member to move, the clutch assembly being coupled with the output member to cause the drive member to disengage from actuation of the clutch assembly, the second mechanism driving the drive member back to the first initial position to cause the drive member to drive the output member back to the second initial position in response to the clutch assembly being coupled with the output member; the output member in the second initial position is engaged with the clutch assembly in response to the clutch assembly being driven into engagement with the output member.

Further, the second mechanism comprises a reset piece, a first element, a guide piece and a second element arranged on the transmission piece;

responsive to the clutch mechanism being coupled to the output member and responsive to the first member engaging the second member under the influence of the reset member, the first member is driven by the reset member to perform a second movement to drive the second member and thereby drive the transmission member back to the first initial position;

the guide member guides the first member to perform the second movement in the first preset direction.

Further, in response to the transmission member being driven by the first element to reach the first initial position, the first element abuts against the second element under the action of the reset element so as to limit the transmission member to the first initial position;

responsive to the transmission being driven by the output member to disengage from the first initial position, the first element is driven by the transmission for a third movement to disengage the first element from the second element;

the guide member guides the first member to perform a third movement in the second preset direction.

Further, the first element is a protrusion, and the second element is a groove;

the clutch assembly is coupled with the output member, and the first element partially enters the groove and is abutted with the groove under the action of the reset member, and the reset member drives the protrusion to do the second motion so as to drive the groove, and then the transmission member is driven to return to the first initial position;

in response to the transmission member being driven by the first element to reach the first initial position, the protrusion is abutted against the groove under the action of the reset member so as to limit the transmission member to the first initial position;

in response to the transmission member being driven by the output member to disengage from the first initial position, the protrusion performs a third movement under the drive of the transmission member to disengage the protrusion from the recess.

Further, the guide member includes a receiving cavity in which the first element is at least partially movably disposed, the receiving cavity guiding the first element to perform the second movement in the first preset direction; the accommodating cavity guides the first element to perform the third movement along the second preset direction.

Further, the first preset direction is opposite to the second preset direction.

Further, the first preset direction intersects with the movement direction of the transmission member.

Further, the transmission piece is provided with a guide surface; the output member drives the transmission member to move forwards so that the transmission member is disconnected from the first element, and the guide surface abuts against the first element and drives the first element to move in response to the transmission member being driven to move backwards;

in response to the clutch assembly being coupled to the output member, the first member is driven by the reset member to perform a second motion to drive the second member and thereby drive the transmission member back to the first initial position.

Further, in response to the transmission member being disengaged from the first member, the guide member detents the first member to prevent the first member from disengaging the guide member.

Further, the guide member comprises a first limiting member, the first element comprises a second limiting member, and the first limiting member cooperates with the second limiting member to stop the first element.

Further, the first limiting piece comprises a first abutting surface, the second limiting piece comprises a second abutting surface, and the first abutting surface abuts against the second abutting surface to stop the first element.

Further, the first member has a predetermined position, and the first member is held in the predetermined position in response to the transmission member being driven forward by the output member to disengage from the first initial position.

Further, the reset element is an elastic element, and the elastic element is connected with the first element;

in response to the clutch assembly being coupled to the output member, the first member is driven by the resilient member to perform a second movement to drive the second member and thereby drive the transmission member back to the first initial position.

Further, in response to the clutch assembly being coupled to the output member and in response to the first member being engaged with the second member by the resilient member, the resilient member drives the first member to perform a second movement to drive the second member to move and thereby drive the transmission member back to the first initial position;

responding to the driving part driven by the first element to reach the first initial position, and enabling the first element to prop against the second element under the action of the elastic element so as to limit the driving part at the first initial position;

In response to the transmission being driven by the output member to disengage from the first initial position, the first element is driven by the transmission to a third motion to disengage the first element from the second element.

Further, the second mechanism is a magnetic element, and the transmission piece is made of a magnetic substance;

in response to the clutch assembly being coupled to the output member, the magnetic element drives the transmission member back to the first initial position.

Further, in response to the transmission member reaching the first initial position, the magnetic element restrains the transmission member in the first initial position.

The invention has the beneficial effects that: according to the technical scheme, the transmission part can return to the first initial position each time, the output part can return to the second initial position each time, and the output part in the second initial position is connected with the clutch assembly again, so that the surgical instrument can be ensured to be used normally, and the operation requirement is met.

Drawings

FIG. 1 is a schematic view of the surgical instrument of the present invention;

FIG. 2 is a schematic illustration of a partial internal structure of the surgical instrument illustrated in FIG. 1;

FIG. 3 is a cross-sectional view of a surgical instrument in an embodiment;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a schematic structural view of a second mechanism in the embodiment;

FIG. 6 is a schematic structural view of a second mechanism in another embodiment;

FIG. 7 is a cross-sectional view of the first mechanism in an embodiment;

FIG. 8 is a cross-sectional view of the first mechanism in another embodiment;

FIG. 9 is an exploded view of a partial internal structure of the surgical instrument illustrated in FIG. 1;

FIG. 10 is a schematic structural view of a first clutch member, a second clutch member, and an intermediate member;

FIG. 11 is a state diagram of the second mechanism, the first mechanism, and the drive assembly with the drive member in a first initial position, the output member in a second initial position, and the jaws not closed;

FIG. 12 is a state diagram of the output member, the first clutch member and the intermediate member of FIG. 11;

FIG. 13 is a state diagram of the second mechanism, the first mechanism, and the drive assembly with the drive member in the first initial position, the output member in the second initial position, and the jaws closed;

FIG. 14 is a state diagram of the output member, the first clutch member, and the intermediate member of FIG. 12;

FIG. 15 is a state diagram of the second mechanism, the first mechanism, and the transmission assembly with the transmission member in a first initial position, the output member in a second initial position, and the second operative rotational movement structure of the second clutch member fully disengaged from the drive gear after the jaws are not closed;

FIG. 16 is a state diagram of the output member, first clutch member and intermediate member of FIG. 15;

FIG. 17 is a state diagram of the second mechanism, the first mechanism, and the drive assembly with the drive member in the first initial position, the output member in the second initial position, and the first operative configuration of the first clutch member after the jaws are not closed, and with the output member initially engaged;

FIG. 18 is a state diagram of the output member, first clutch member and intermediate member of FIG. 15;

FIG. 19 is a state diagram of the second mechanism, the first mechanism, and the transmission assembly with the transmission disengaged from the first home position;

FIG. 20 is a state diagram of the output member, the first clutch member, and the intermediate member of FIG. 19;

FIG. 21 is a state diagram of the second mechanism, the first mechanism and the drive assembly when the cutting tool feed is completed;

FIG. 22 is a state diagram of the output member, the first clutch member, and the intermediate member of FIG. 21;

FIG. 23 is a state diagram of the second mechanism, the first mechanism and the transmission assembly with the transmission member moving to the first initial position and the output member engaging the last tooth of the first positive displacement structure of the first clutch member;

FIG. 24 is a state diagram of the output member, the first clutch member, and the intermediate member of FIG. 23;

FIG. 25 is a state diagram of the second mechanism, the first mechanism, and the drive assembly when the first mechanism begins to couple with the drive member;

FIG. 26 is a state diagram of the output member, the first clutch member, and the intermediate member of FIG. 25;

FIG. 27 is a cross-sectional view of FIG. 25;

FIG. 28 is a schematic view of a prior art output member again coupled to a toothed portion of a clutch assembly;

FIG. 29 is a state diagram of the second mechanism, the first mechanism, and the drive assembly with the drive member in the first initial position, the output member in the second initial position, and the jaws unopened;

fig. 30 is a schematic view of the stapler and the reset limiter.

Reference numerals of the above drawings:

1. a surgical instrument; 11. a second mechanism; 111. a reset member; 112. a first element; 113. a second abutment surface; 114. a second element; 115. a guide surface; 116. a guide; 117. a first abutment surface; 118. a main body portion; 119. a protrusion; 12. a magnetic element; 13. a main body;

2. a first mechanism; 21. a drive gear; 211. a drive shaft; 22. a clutch assembly; 23. a first gear; 231. a first toothed portion; 232. a first toothless portion; 24. a second gear; 241. a second end face; 242. a second toothed portion; 243. a second toothless portion; 244. a bump; 25. a third gear; 251. a first end face; 252. an arc groove; 253. a head end; 26. an output assembly; 261. a fourth gear; 262. a connecting rod; 27. a rotation shaft;

3. A transmission assembly; 31. a rack; 32. a slide block;

4. a shaft assembly; 41. a mandrel; 42. a sleeve;

5. an end effector; 51. a staple cartridge holder; 52. a nail supporting seat; 53. a staple cartridge assembly.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be appreciated that the terms "proximal", "rear" and "distal", "front" are used herein with respect to a clinician manipulating a handle of a stapler. The terms "proximal" and "posterior" refer to the portions that are closer to the clinician, and the terms "distal" and "anterior" refer to the portions that are farther from the clinician. I.e., the handle is proximal and the end effector 5 is distal, e.g., the proximal end of a component represents an end relatively close to the handle and the distal end represents an end relatively close to the jaw assembly. The terms "upper" and "lower" refer to the relative positions of the staple abutment 52 and the cartridge seat 51 of the jaw assembly, specifically the staple abutment 52 being "upper" and the cartridge seat 51 being "lower". However, the stapler can be used in many orientations and positions, and thus these terms expressing relative positional relationships are not limiting and absolute.

In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, movably connected, or integrated, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two elements or interaction relationship between the two elements such as abutting. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. It should be noted that, when the terms "connected" and "connected" are used in the meanings defined by the corresponding terms, only the cases where the terms are clearly required are excluded, and other possible cases are not excluded, such as "detachably connected" means detachably connected, not including being integrated, but movable connection and the like are not excluded.

The first initial position is the position of the driving member when the cutter is retracted in place, and the second initial position is the position of the output member when the driving member is in the first initial position, with reference to the driving member in the first initial position and the output member in the second initial position in fig. 11.

Selective connection refers to a joint or coupling. Coupling refers to the termination of a joint due to the lack of structure for the joint due to a change in relative position or state between the interacting components.

In this context, the idle stroke means that the clutch assembly 22 has no motion output, i.e., does not drive the cutting blade drive assembly or the jaw drive assembly, when the clutch assembly 22 has a motion input, i.e., is driven. The idle stroke structure means a structure which is provided in the components of the clutch unit 22 and which can realize an idle stroke. By effective rotation is meant that the clutch assembly 22 has a motion output, i.e., drives the cutter drive assembly or the jaw drive assembly, when the clutch assembly 22 has a motion input, i.e., is driven. The effective transfer structure means a structure which is provided in the components of the clutch assembly 22 and which can realize effective transfer.

Referring to fig. 1, a conventional surgical instrument 1 includes a main body 13, a shaft assembly 4 extending distally from the main body 13, an end effector 5 disposed at a distal end of the shaft assembly 4, and a cutting blade (not shown).

The surgical instrument 1 further comprises a first mechanism 2, a transmission assembly 3, and a power module, the first mechanism 2 being located within the body 13, the transmission assembly 3 being located partially within the body 13, partially within the shaft assembly 4, and partially within the end effector 5; the cutter is located within the end effector 5. The electric module includes a motor. The first mechanism 2 drives the transmission assembly 3 to move, the transmission assembly 3 comprises a transmission member, the first mechanism 2 comprises an input member, a clutch assembly 22 connected with the input member and an output assembly 26, the input member is connected with a motor, and the output assembly 26 comprises an output member and an output element.

The surgical instrument 1 further comprises a second mechanism 11. The first mechanism 2 comprises a clutch assembly 22 and an output member, the clutch assembly 22 being engaged or coupled with the output member, the output member being connected with the transmission member, the transmission member having a first initial position, the output member having a second initial position, when the transmission member is in the first initial position, the output member being in the second initial position, the clutch assembly 22 being engaged with the output member to drive the transmission member into motion, the clutch assembly 22 being coupled with the output member such that the transmission member is disengaged from actuation of the clutch assembly 22, the second mechanism 11 driving the transmission member back to the first initial position to drive the output member back to the second initial position in response to the clutch assembly 22 being coupled with the output member, the output member being in the second initial position being engaged with the clutch assembly 22 in response to the clutch assembly 22 being actuated to connect with the output member.

It can be appreciated that the second mechanism returns to the first initial position through driving the transmission member to enable the output member to return to the second initial position, so that the output member can be engaged with the clutch assembly again, the problem that the first mechanism cannot drive the transmission member to return to the first initial position and then cause the failure of the surgical instrument is effectively prevented, the surgical instrument can be normally used, the service life of the surgical instrument is prolonged, the surgical instrument is more stable, and the surgical risk is reduced.

The above structure will be described in detail using a stapler as an example. In particular, the driving member is a rack 31.

In this embodiment, referring to fig. 2 to 8, the second mechanism 11 includes a reset element 111, a first element 112, a guide element 116, and a second element 114 disposed on the transmission element.

In response to the clutch assembly 22 being coupled to the output member, the first member 112 is driven by the reset member 111 to perform a second motion to drive the second member 114, which in turn drives the transmission member back to the first initial position;

the guide 116 guides the first member 112 for a second movement in a first predetermined direction.

Specifically, the restoring member 111 is an elastic member, and one end of the elastic member is connected to the first element 112.

In response to the clutch assembly 22 being coupled to the output member and in response to the first member 112 being engaged with the second member 114 by the first member being moved by the resilient member, the resilient member drives the first member 112 to move the second member 114 to drive the transmission member back to the first initial position.

In response to the driving member reaching the first initial position, the first member 112 abuts against the second member 114 under the action of the elastic member to limit the driving member to the first initial position.

In response to the transmission member being driven by the output member to disengage the first initial position, the transmission member drives the first member 112 for a third movement to disengage the first member 112 from the second member 114.

The guide 116 guides the first member 112 to perform the first and second movements in the first preset direction, and the guide 116 guides the first member 112 to perform the third movement in the second preset direction.

Specifically, referring to fig. 7 and 8, in the present embodiment, the first element 112 is a protrusion 119, and the second element 114 is a groove.

Referring to fig. 25 to 27, in response to the clutch assembly 22 being coupled to the output member and in response to the protrusion 119 being moved by the reset member 111 for a first movement such that the protrusion 119 partially enters the recess and abuts the recess, the reset member 111 drives the protrusion 119 for a second movement to drive the recess to move, thereby driving the transmission member back to the first initial position.

Referring to fig. 29, in response to the driving member being driven by the first member 112 to reach the first initial position, the protrusion 119 abuts against the recess under the action of the reset member 111 to limit the driving member to the first initial position.

Referring to fig. 19, in response to the transmission member being driven by the output member to disengage from the first initial position, the protrusion 119 is driven by the transmission member to perform a third movement such that the protrusion 119 is separated from the recess.

Referring to fig. 7, in this embodiment, the protrusion 119 includes an arc surface with a convex shape, and the groove may be a wedge with an concave shape. In other embodiments, referring to FIG. 8, the protrusion 119 comprises a convex arcuate surface and the recess comprises a concave arcuate surface.

In this embodiment, referring to fig. 4, the guide 116 includes a receiving cavity in which the first member 112 is at least partially movably disposed, the receiving cavity guiding the first member 112 to perform the second and third movements in the first preset direction; the receiving cavity guides the first member 112 for a third movement in a second predetermined direction.

The inner wall surface of the receiving chamber acts on the first member 112 to make a second movement in a first preset direction or a third movement in a second preset direction. The first element 112 is at least partially accommodated in the accommodating cavity, the accommodating space of the accommodating cavity is slightly larger than the first element 112, and the accommodating space of the accommodating cavity is matched with the shape of the first element 112, so that the inner wall surface of the accommodating cavity can play a role in guiding the first element 112, the first element 112 is prevented from swinging back and forth by a large extent when performing first movement, second movement and third movement, and the effect of driving the rack 31 to return to the first initial position is affected.

Specifically, the first member 112 includes a body portion 118 and a protrusion 119. The guide 116 includes a cavity above and in communication with the through hole for movably receiving the body portion 118 of the first member 112, and a through hole for movably receiving at least a portion of the projection 119 of the first member 112, the first abutment surface 117 being a bottom surface of the cavity. Specifically, the receiving chamber includes a first receiving chamber and/or a second receiving chamber, the first receiving chamber is obtained by setting a shape of the cavity to match a shape of the body portion 118 of the first member 112, setting a size of the cavity to be slightly larger than a size of the body portion 118 to guide movement of the body portion 118, and the second receiving chamber is obtained by setting a shape of the through hole to match a shape of the protrusion 119 of the first member 112, setting a size of the through hole to be slightly larger than a size of the protrusion 119 to guide movement of the protrusion 119, whereby the first receiving chamber guides movement of the body portion 118 of the first member 112, and the second receiving chamber guides movement of the protrusion 119 of the first member 112, and thus the receiving chamber guides movement of the body portion 118 of the first member 112 and/or guides movement of the protrusion 119 of the first member 112.

The first preset direction is opposite to the second preset direction. The first preset direction intersects with the movement direction of the transmission piece. In this embodiment, the first preset direction is perpendicular to the moving direction of the driving member.

The "preset position" of the first element 112 herein refers to a position where the first element 112 is located when the first element 112 is separated from the second element 114, and the first element 112 is located at the rear side of the second element 114 and abuts against the transmission element. In other embodiments, the transmission includes a guide surface 115, and the position where the first element 112 abuts the guide surface 115 is not a "preset position".

Referring to fig. 5 and 21, in the present embodiment, the protrusion 119 is disengaged from the rack 31 in response to the rack 31 being driven to move forward by the output member, so that the protrusion 119 is no longer abutted against the rack 31 during the movement of the rack 31 to eliminate the friction force applied by the rack 31. The rack 31 is also provided with a guide surface 115. After the rack 31 moves forward for a certain stroke, the rack 31 is disengaged from the boss 119, then, in response to the rack 31 being operated to move backward, the guide surface 115 abuts against the boss 119 and drives the boss 119 to move, the rack 31 moves further backward, in response to the clutch assembly 22 being coupled to the output member, and in response to the reset member 111 driving the boss 119 to make a first movement portion into the recess and abut against the recess, the reset member 111 driving the boss 119 to make a second movement and thus driving the rack 31 back to the first initial position.

It will be appreciated that when the protrusion 119 is disengaged from the rack 31, and the rack 31 moves rearward in contact with the protrusion 119, the guide surface 115 can drive the protrusion 119 upward, preventing the protrusion 119 from abutting the rack 31, interfering with the rearward movement of the rack 31.

Referring to fig. 6, in other embodiments, after the rack 31 is driven by the output member to move forward so that the first member 112 is separated from the second member 114, the first member 112 is kept at the preset position when the first member 112 is located at the rear side of the second member 114 and abuts against the transmission member.

Referring to fig. 4 and 21, in response to the transmission member being disengaged from the first member 112, the guide 116 cooperates with the first member 112 to stop the first member 112 to prevent the first member 112 from disengaging the guide 116. The guide 116 further includes a first stop and the first member 112 further includes a second stop. In response to the transmission member being disengaged from the first member 112, the reset member 111 drives the first member 112 in a first predetermined direction such that the second stop member cooperates with the first stop member to stop the first member 112, thereby preventing the first member 112 from disengaging the guide 116.

Specifically, the first stop includes a first abutment surface 117 and the second stop includes a second abutment surface 113. The second abutment surface 113 is provided on the main body portion 118 of the first member 112, the projection 119 is provided on one surface of the main body portion 118, and the second abutment surface 113 is provided on the periphery of the projection 119. The guide 116 further comprises a through hole, which movably accommodates the protrusion 119 of the first stop, and a first abutment surface 117. The first abutment surface 117 is a bottom surface of the cavity, and the through hole extends from the first abutment surface 117 to the outside of the cavity along a first predetermined direction. In response to the transmission member being disengaged from the first member 112, the reset member 111 drives the first member 112 in a first predetermined direction such that the second abutment surface 113 of the first member 112 abuts the first abutment surface 117 of the guide 116, thereby preventing the first member 112 from disengaging from the guide 116.

It will be appreciated that the first abutment surface 117 and the second abutment surface 113 are effective to prevent the first member 112 from backing out of the guide 116 when the transmission is disengaged from the first member 112, thereby interfering with the transmission movement as the transmission moves rearward.

In this embodiment, the body portion 118 and the protrusion 119 are integrally formed as a sphere, the accommodating space of the cavity is cylindrical, the body portion 118 is movably accommodated in the cavity, the body portion 118 moves in the accommodating space of the cavity, the protrusion 119 is at least partially movably inserted into the through hole, and the protrusion 119 can at least partially move in the through hole. Further, by setting the size of the accommodation space formed by the above-described cavity slightly larger than the size of the main body portion 118, so that the above-described cavity becomes a first accommodation chamber, the first accommodation chamber guides the movement of the main body portion 118; the other receiving space formed by the through-hole is sized slightly larger than the size of the protrusion 119 and matches the shape of the protrusion 119 of the first member 112 so that the through-hole becomes a second receiving chamber, which guides the movement of the protrusion 119.

It will be appreciated that in other embodiments, the receiving space of the cavity may be other shapes, as may the shape of the body portion 118. The protrusion 119 may have other shapes, and the through hole may have a shape matching the shape of the protrusion 119.

The shaft assembly 4 includes a spindle 41 and a sleeve 42 fitted over the spindle 41, and the spindle 41 is connected to the rack 31. The end effector 5 includes a jaw assembly 53 including a cartridge housing 51 and a staple cartridge abutment 52 pivotally coupled to the cartridge housing 51, the cartridge housing 51 being operable to support the cartridge assembly 53 therein, the staple cartridge abutment 52 being selectively movable between an open position and a closed position to cooperate with the cartridge housing 51 and the cartridge assembly 53 to unclamp or clamp tissue. The cutter is located within the end effector 5. The cartridge assembly 53 is provided with a feed slot in which a cutting knife moves, the cutting knife cuts tissue during distal movement within the feed slot, and staples housed in the cartridge assembly 53 are pushed out to staple the tissue.

The stapler further comprises a first mechanism 2, a transmission assembly 3 and an electric module, the first mechanism 2 being located in the main body 13, the transmission assembly 3 being located partly in the main body 13, partly in the shaft assembly 4 and partly in the end effector 5.

The electric module includes a motor. The first mechanism 2 includes an input member, a clutch assembly 22 coupled to the input member, and an output assembly 26. The input member is a drive gear 21, and is connected to the motor.

The output assembly 26 includes an output member, which is a fourth gear 261, and an output member, which is a link 262.

The clutch assembly 22 includes a first clutch member including a first active range feature and a first idle range feature, an intermediate member, and a second clutch member. The intermediate member includes a first clutch structure. The second clutch member includes a second effective transfer structure and a second idle transfer structure, and the second clutch member further includes a second clutch structure. The intermediate piece is connected with the first clutch piece and rotates synchronously, the driving gear 21 is connected with the intermediate piece, the driving gear is sleeved on the driving shaft 211, and the driving shaft 211 is connected with the motor. The clutch assembly 22 further includes a rotating shaft 27, the intermediate member and the second clutch member are rotatably sleeved on the rotating shaft 27, when the first clutch structure of the intermediate member is connected with the second clutch structure of the second clutch member, the intermediate member drives the second clutch member to move, and when the first clutch structure of the intermediate member is separated from the second clutch structure of the second clutch member, the second clutch member is separated from the driving of the intermediate member.

In the present embodiment, referring to fig. 9 and 10, the first clutch member is a first gear 23, the first gear 23 has a first toothed portion 231 and a first non-toothed portion 232, the first toothed portion 231 is a first effective rotation structure, and the first non-toothed portion 232 is a first idle rotation structure. The second clutch member is a second gear 24, the second gear 24 has a second toothed portion 242 and a second toothless portion 243, the second toothed portion 242 is a second effective rotation path structure, and the second toothless portion 243 is a second idle rotation path structure.

The middle piece is a third gear 25 and comprises a first clutch structure, the first clutch structure is an arc groove 252, the arc groove 252 is arranged on a first end face 251 of the third gear 25, and the third gear 25 is connected with the driving gear 21; the second gear 24 includes a second clutch structure, the second clutch structure is a bump 244, the bump 244 is disposed on the second end face 241 of the second gear 24, the first end face 251 of the intermediate member is adjacent to the second end face 241 of the second clutch member, the bump 244 at least partially extends into the circular arc groove 252, the center of the circular arc groove 252 is located on the rotation axis of the component where the circular arc groove 252 is located, and the bump 244 can slide in the circular arc groove 252.

On the one hand, the engagement of the projection 244 with the circular arc groove 252 may cause the third gear 25 and the second gear 24 to overlap; on the other hand, when the third gear 25 drives the fourth gear 261 via the first gear 23, the protrusion 244 can slide in the circular arc groove 252, and the second gear 24 does not rotate with the third gear 25, and at this time, the second toothless portion 243 is coupled with the driving gear 21, so that when the first mechanism 2 drives the cutter assembly to move, the second gear 24 does not drive the end effector 5 to close or open.

Specifically, as shown in fig. 29, when the boss 244 abuts against the head end 253 of the circular arc groove 252, as the driving gear 21 drives the third gear 25 to rotate clockwise, the third gear 25 rotates such that the head end 253 of the circular arc groove 252 drives the boss 244 abutting against it to rotate, thereby driving the second gear 24 to rotate, so that the second gear 24 and the driving gear 21 are switched from the coupled state, i.e., the second toothless portion 243 is coupled with the driving gear 21, to the engaged state, i.e., the second toothed portion 242 is engaged with the driving gear 21. That is, the connection of the protrusion 119 with the circular arc groove 252 enables the coupling of the driving gear 21 with the second toothless portion 243 to be converted into the engagement of the driving gear 21 with the second toothed portion 242, thereby realizing the conversion of the second gear 24 to the link 262 from the non-driving state to the driving state.

Specifically, referring to fig. 23 and 25, in the process of moving the rack 31 to the first initial position, the third gear 25 drives the first gear 23 to rotate clockwise, the first toothed portion 231 of the first gear 23 is disengaged from the fourth gear 261, the fourth gear 261 is coupled with the first toothless portion 232 (see fig. 25), the third gear 25 continues to rotate by one tooth under the driving of the driving gear 21, so that the bump 244 abuts against the head end 253 of the circular arc groove 252 (see fig. 29), and further, the teeth of the second toothed portion 242 of the second gear 24 are aligned up and down with the teeth of the third gear 25, but the second toothed portion 242 is not yet meshed with the driving gear 21, at this time, if the motor rotates, the driving gear 21 continues to drive the third gear 25 to rotate, and the head end 253 of the circular arc groove 252 drives the bump 244 to rotate synchronously, so that the second toothed portion 242 starts to mesh with the driving gear 21, so that the second gear 24 and the third gear 25 can mesh with the driving gear 21 synchronously, so as to ensure that the subsequent end effector 5 is opened smoothly and the tissue is released.

Referring to fig. 2, the drive assembly 3 includes a cutting blade drive assembly for driving a cutting blade in the end effector 5 and a jaw drive assembly for driving the opening or closing of the jaw assemblies of the end effector 5.

The cutter drive assembly includes a rack 31 and a spindle 41 connected to the distal end of the rack 31, the distal end of the spindle 41 being connected to the cutter. When the first toothed portion 231 of the first gear 23 is engaged with the fourth gear 261, the first gear 23 drives the fourth gear 261 to rotate, the fourth gear 261 drives the rack 31 to move, the rack 31 drives the mandrel 41 to move, and the mandrel 41 drives the cutter to move in the end effector 5; when the first toothless portion 232 of the first gear 23 is coupled with the fourth gear 261, the fourth gear 261 is disengaged from the drive of the drive gear 21, the rack 31 is coupled with the first mechanism 2, and the rack 31 is disengaged from the drive of the first mechanism 2.

The jaw transmission assembly comprises a sliding block 32 connected with a connecting rod 262 and a sleeve 42 connected with the sliding block 32, the connecting rod 262 is connected with the second gear 24, when a second toothed part 242 of the second gear 24 is engaged with the driving gear 21, the driving gear 21 drives the second gear 24 to rotate, the second gear 24 drives the connecting rod 262 to move, the connecting rod 262 drives the sliding block 32 and the sleeve 42 to move, and the sleeve 42 drives the jaw assembly to open and close; when the second toothless portion 243 of the second gear 24 is coupled with the driving gear 21, the second gear 24 is disengaged from the driving of the driving gear 21, and the link 262 is coupled with the first mechanism 2.

One end of the connecting rod 262 is rotatably arranged on the second end face 241 of the second gear 24, the second gear 24 drives the connecting rod 262 to move, and the connecting rod 262 moves to drive the jaw transmission assembly to move so as to drive the jaw assembly to open or close. The position of the first gear 23 corresponds to the position of the fourth gear 261 such that the first gear 23 is selectively connected with the fourth gear 261, the fourth gear 261 is engaged with the rack 31, and when the first toothed portion 231 of the first gear 23 is engaged with the fourth gear 261, the fourth gear 261 drives the rack 31 to advance or retreat, and the rack 31 drives the cutter to advance or retreat through the spindle 41.

The movement of the stapler during operation is described in detail below.

Referring to fig. 11 and 12, the rack 31 is in the first initial position, the fourth gear 261 is in the second initial position, the end effector 5 is in the open state, and the protrusion 244 is at the head end 253 of the circular arc groove 252. The operator activates the motor, which rotates the drive gear 21 in a forward direction, which in turn drives the drive gear 21 in a clockwise direction, the drive gear 21 is meshed with the first toothed portion 231 of the first gear 23, the second toothed portion 242 of the second gear 24, and the third gear 25, the first toothless portion 232 of the first gear 23 is coupled with the fourth gear 261, the tab 244 of the second gear 24 is positioned at the head end 253 of the circular slot 252 of the third gear 25, the drive gear 21 drives the first gear 23, the second gear 24, and the third gear 25 to rotate in a synchronous counterclockwise direction, the tab 244 is held at the head end 253 of the circular slot 252, the second gear 24 rotates to drive the link 262 to move, the link 262 in turn drives the slider 32, the slider 32 drives the sleeve 42 to move forward, the jaw assembly of the end effector 5 is closed, the first toothless portion 232 of the first gear 23 is coupled with the fourth gear 261, the fourth gear 261 is held at the second initial position, and the rack 31 is held at the first initial position.

Referring to fig. 13 and 14, the jaw assembly is closed to the bottom, and the second toothed portion 242 of the drive gear 21 and the second gear 24 are about to disengage.

Referring to fig. 15 and 16, the driving gear 21 is completely disengaged from the second toothed portion 242 of the second gear 24, at this time, the second toothless portion 243 is coupled with the driving gear 21, the driving gear 21 is kept engaged with the third gear 25, and the first gear 23 rotates synchronously with the third gear 25. In response to the second toothless portion 243 being coupled to the drive gear 21, the third gear 25 continues to rotate, and the tab 244 slides from the head end 253 of the circular arc groove 252 to the tip end.

Referring to fig. 15 to 20, the motor continues to rotate in the forward direction, the motor drives the driving gear 21 to rotate in the forward direction, the driving gear 21 drives the first gear 23 to rotate through the third gear 25, so that the first toothed portion 231 of the first gear 23 is engaged with the fourth gear 261 in the second initial position, the fourth gear 261 starts to rotate from the second initial position to drive the rack 31 to move forward from the first initial position, the rack 31 drives the protrusion 119 to move in the third direction to separate the protrusion 119 from the groove in response to the rack 31 being operated to move forward to separate from the first initial position, the protrusion 119 is guided to move in the third direction in the second preset direction, further the protrusion 119 is ensured to release the limit of the transmission member, the protrusion 119 is prevented from moving forward under the action of the friction force of the rack 31 in the third movement, and the limit of the transmission member cannot be released quickly and accurately, even the movement of the rack 31 is interfered. The inner wall surface of the receiving cavity acts on the protrusion 119 to make a third movement thereof in a second preset direction.

It will be appreciated that referring to fig. 15 to 20, "the first toothed portion 231 of the first gear 23 is engaged with the fourth gear 261 in the second initial position" means that the teeth 6 of the first gear 23 push against the teeth 13 of the fourth gear 261, thereby causing the teeth 12 of the fourth gear 261 to enter between the teeth 6 and 5 of the first gear 23, such that the first toothed portion 231 of the first gear 23 is engaged with the fourth gear 261.

The rack 31 drives the spindle 41 to move and thus the cutter to move in the end effector 5, and referring to fig. 4, 5 and 21, in response to the rack 31 moving forward to disengage from the protrusion 119, the reset member 111 drives the second element 114 to move in a first preset direction, so that the second abutment surface 113 moves and thus the second abutment surface 113 moves to abut against the first abutment surface 117, thereby stopping the second element 114.

In other embodiments, referring to fig. 6, the first member 112 is maintained at a predetermined position during the driving movement of the rack 31 by the first mechanism 2.

As shown in fig. 19 and 20, in the state of the clutch assembly 22 at some point during the forward movement of the cutting blade, the second toothless portion 243 is coupled to the drive gear 21, the second gear 24 does not rotate, and the drive gear 21 cannot drive the end effector 5, i.e., the jaw assembly remains in the closed state. The first toothed portion 231 is meshed with the fourth gear 261, the driving gear 21 drives the third gear 25 to rotate anticlockwise so as to drive the first gear 23 to rotate, the first gear 23 drives the fourth gear 261 to rotate, the circular arc groove 252 of the first gear 23 rotates anticlockwise along with the first gear 23, and then the convex block 244 originally positioned at the head end 253 of the circular arc groove 252 slides towards the tail end until reaching the position shown in fig. 16. At this time, the cutter feeding process is completed.

In the position shown in fig. 21 and 22, the cutting blade completes the tissue cut. At this time, the operator operates the motor to rotate reversely, the motor drives the driving gear 21 to rotate counterclockwise, the driving gear 21 drives the first gear 23 and the third gear 25 to rotate clockwise, the first toothed portion 231 of the first gear 23 drives the fourth gear 261 to rotate counterclockwise, and the fourth gear 261 drives the rack 31 to move toward the first initial position.

In this embodiment, referring to fig. 5, 21 and 22, the rack 31 is provided with a guide surface 115. The rack 31 moves forward to disengage the rack 31 from the boss 119, and in response to the rack 31 moving rearward, the guide surface 115 abuts the boss 119 and drives the boss 119 to move to bring the boss 119 to a preset position.

Referring to fig. 23, the transmission member continues to move toward the first initial position, and the output member is engaged with the last tooth 6 of the first toothed portion 231 of the first gear 23.

Referring to fig. 25, 26 and 29, in the present embodiment, before the first mechanism 2 starts to be coupled with the rack 31, the reset member 111 drives the protrusion 119 at the preset position to perform the first movement along the first preset direction, so that the protrusion 119 partially enters the groove and abuts against the groove.

In other embodiments, after the first mechanism 2 starts to be coupled with the rack 31, the reset member 111 drives the protrusion 119 at the preset position to perform the first movement along the first preset direction, so that the protrusion 119 partially enters the groove and abuts against the groove.

The guide 116 guides the protrusion 119 to perform a first movement in a first predetermined direction, ensuring that the protrusion 119 partially enters the groove along the first predetermined direction and abuts against the groove, thereby ensuring that the subsequent protrusion 119 drives the groove.

It will be appreciated that referring to fig. 25 and 26, the first mechanism 2 begins to couple with the rack 31 and the fourth gear 261 does not return to the second initial position. If the fourth gear 261 is held in this position, the first tooth 6 of the first toothed portion 231 of the first gear 23 may abut against the tooth 12 of the fourth gear 261, resulting in tooth striking, leading to failure of the first mechanism 2, when the first tooth 6 is again connected with the fourth gear 261.

In this process, the second toothless portion 243 is coupled to the driving gear 21, the second gear 24 does not rotate, the driving gear 21 cannot drive the end effector 5 to move, that is, the jaw assembly is kept in the closed state, and the circular arc groove 252 of the first gear 23 rotates along with the first gear 23, so that the protruding block 244 originally located at the end of the circular arc groove 252 slides toward the head end 253. In response to the protrusion 119 in the preset position being subjected to a first movement by the reset member 111 such that the protrusion 119 is at least partially moved into the recess away from the preset position, and in response to the first toothless portion 232 of the first gear 23 being coupled with the fourth gear 261, the reset member 111 drives the protrusion 119 to perform a second movement to drive the recess movement and thus the rack 31 back to the first initial position. The inner wall surface of the receiving cavity of the guide 116 acts on the protrusion 119 to make it perform a second movement in the first preset direction, ensuring that the protrusion 119 can abut against the inner wall surface of the groove to perform a second movement and thus drive the groove to move toward the first initial position.

Referring to fig. 25 and 26, in response to the first toothless portion 232 of the first gear 23 being coupled with the fourth gear 261, the rack 31 is disengaged from the driving of the first mechanism 2, and the protrusion 119 at least partially disposed in the recess starts to perform the second movement under the action of the reset member 111 to drive the recess to move toward the first initial position so that the rack 31 moves toward the first initial position, and the rack 31 moving toward the first initial position drives the fourth gear 261 to move toward the second initial position.

Specifically, referring to fig. 25 to 27, at this time, the output member and the clutch assembly 22 begin to be coupled, if the second mechanism 11 is not used to drive the transmission member back to the first initial position, the output member cannot return to the second initial position, and the clutch assembly 22 continues to rotate, so that the toothed portion of the clutch assembly 22 is connected to the output member again. Referring to fig. 28, the clutch assembly 22 continues to move until the toothed portion of the clutch assembly is connected with the teeth of the output member again, and the teeth 6 of the gear of the output member are abutted with the teeth 6 of the toothed portion of the clutch assembly 22 because the output member is not in the second initial position, so that the motor is overloaded and the motor or the circuit board is disabled; or the teeth of the output piece and/or the teeth of the clutch component are damaged, and the tooth scraps fall off, so that the anastomat is in fault; or the teeth of the output piece and/or the teeth of the clutch component are damaged, so that the teeth are lacked, the stroke of the rack is shortened, and the cutting knife cannot cut in place.

Referring to fig. 5 and 29, in response to the rack 31 being driven to move backward to reach the first initial position, the protrusion 119 abuts against the groove under the action of the reset element 111 to limit the rack 31 at the first initial position, further limit the fourth gear 261 at the second initial position, prevent the rack returning to the first initial position from moving forward under the action of gravity, further drive the fourth gear 261 to depart from the second initial position, and ensure that the fourth gear 261 can be engaged with the first toothed portion 231 when being connected with the first gear 23 next time.

As the first toothless portion 232 of the first gear 23 is coupled with the fourth gear 261, the motor continues to rotate reversely, the third gear 25 continues to rotate, so that the protruding block 244 abuts against the head end 253 of the circular arc groove 252, and further, the teeth of the second toothed portion 242 of the second gear 24 are aligned up and down with the teeth of the third gear 25, but the second toothed portion 242 is not meshed with the driving gear 21, at this time, the motor rotates, the driving gear 21 drives the third gear 25 to rotate, and when the third gear 25 rotates, the head end 253 of the circular arc groove 252 drives the protruding block 244 to synchronously rotate, so that the second toothed portion 242 starts to mesh with the driving gear 21, the driving gear 21 drives the second gear 24 to rotate, and the second gear 24 drives the end effector 5 to open.

In other embodiments, referring to fig. 30, the second mechanism 11 is a magnetic element 12, and the material of the transmission member is a ferromagnetic material.

In response to clutch assembly 22 being coupled to the output member, magnetic element 12 drives the transmission member back to the first initial position, and in response to the transmission member reaching the first initial position, magnetic element 12 restrains the transmission member in the first initial position.

Specifically, the first mechanism 2 drives the rack 31 to move towards the first initial position, in response to the coupling of the clutch assembly 22 and the output member, the magnetic element 12 attracts the rack 31 to return to the first initial position through magnetic force so that the rack 31 drives the fourth gear 261 to return to the second initial position, in response to the magnetic element 12 reaching the first initial position, the magnetic element 12 attracts the rack 31 through magnetic force so as to limit the rack 31 at the first initial position, and further limit the fourth gear 261 at the second initial position, so that the input member is ensured to be engaged when being connected with the first toothed portion 231 of the first gear 23 again, and the input member is prevented from being toothed with the first toothed portion 231 of the first gear 23, so that the first mechanism 2 is disabled.

In this embodiment, the magnetic element 12 is disposed at a proximal end of the first initial position, and when the transmission member is in the first initial position, the transmission member is attracted by the magnetic force of the magnetic element 12 so that the transmission member is in contact with the magnetic element 12.

In summary, the present invention utilizes the second mechanism 11 to drive the transmission member back to the first initial position, and further drive the output member back to the second initial position, so as to ensure that the output member can engage with the first toothed portion 231 when being connected with the first toothed portion 231 of the clutch assembly 22 next time, and prevent the output member not in the second initial position from abutting against and striking teeth when being connected with the first toothed portion 231, thereby causing the failure of the surgical instrument. The second mechanism 11 of the present invention is simple in structure and convenient to install. The reset element 111 drives the first element 112 to perform a second motion, so that the first element 112 drives the second element 114, and further drives the transmission element to move towards the first initial position, and the first element 112 abuts against the second element 114 to limit the transmission element at the first initial position, and further limit the output element at the second initial position. The rack 31 moving toward the first initial position drives the output member to move toward the second initial position, and the transmission member limited at the first initial position limits the output member at the second initial position, so as to prevent the output member from abutting against and tooth-striking when being connected with the first effective transfer structure of the clutch assembly 22 again, thereby causing faults such as failure of the surgical instrument.

It should be noted that, although the surgical instrument 1 is described by taking the stapler as an example in this embodiment, the technical solution in this embodiment may be applied to other surgical instruments 1 having components such as an end effector 5, a cutting knife, a transmission member, a driving member, etc., and may drive the transmission member back to the first initial position so as to stably limit the transmission member at the first initial position, so that the output member returns to and is limited at the second initial position, thereby ensuring that the output member is engaged with the effective conversion structure of the clutch assembly 22 again, preventing the output member from being toothed with the clutch assembly 22, and further causing faults such as failure of the surgical instrument.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.

Claims

1. A surgical instrument comprising a first mechanism, a transmission member, and a second mechanism, the first mechanism comprising a clutch assembly and an output member, the clutch assembly being engaged or coupled with the output member, the output member being connected with the transmission member, the transmission member having a first initial position, the output member having a second initial position, the output member being in the second initial position when the transmission member is in the first initial position, the clutch assembly being engaged with the output member to drive the transmission member to move, the clutch assembly being coupled with the output member to cause the transmission member to disengage actuation of the clutch assembly, the second mechanism driving the transmission member back to the first initial position to cause the transmission member to drive the output member back to the second initial position in response to the clutch assembly being coupled with the output member; the output member in the second initial position is engaged with the clutch assembly in response to the clutch assembly being driven into engagement with the output member.

2. The surgical instrument of claim 1, wherein the second mechanism comprises a reset member, a first element, a guide member, and a second element disposed on the transmission member;

3. The surgical instrument of claim 2, wherein in response to the transmission member being driven by the first element to reach the first initial position, the first element is held against the second element by the reset member to limit the transmission member to the first initial position;

4. A surgical instrument as recited in claim 3, wherein the first element is a protrusion and the second element is a recess;

5. A surgical instrument as recited in claim 3, wherein the guide includes a receiving cavity within which the first element is at least partially movably disposed, the receiving cavity guiding the first element for the second movement in the first predetermined direction; the accommodating cavity guides the first element to perform the third movement along the second preset direction.

6. The surgical instrument of claim 5, wherein the first predetermined direction is opposite the second predetermined direction.

7. The surgical instrument of claim 2, wherein the first predetermined direction intersects a direction of movement of the transmission.

8. A surgical instrument according to claim 2, wherein the transmission member is provided with a guide surface;

the output member drives the transmission member to move forwards so that the transmission member is disconnected from the first element, and the guide surface abuts against the first element and drives the first element to move in response to the transmission member being driven to move backwards;

9. The surgical instrument of claim 8, wherein in response to the transmission being disengaged from the first element, the guide member detents the first element to prevent the first element from disengaging the guide member.

10. The surgical instrument of claim 9, wherein the guide comprises a first stop and the first element comprises a second stop, the first stop cooperating with the second stop to stop the first element.

11. The surgical instrument of claim 10, wherein the first stop comprises a first abutment surface and the second stop comprises a second abutment surface, the first abutment surface abutting the second abutment surface to stop the first element.

12. The surgical instrument of claim 2, wherein the first member has a preset position, the first member being maintained in the preset position in response to the transmission member being driven forward by the output member to disengage from the first initial position.

13. The surgical instrument of claim 2, wherein the restoring member is a resilient member coupled to the first member;

14. The surgical instrument of claim 13, wherein in response to the clutch assembly being coupled to the output member and in response to the first member engaging the second member under the influence of the resilient member, the resilient member drives the first member in a second motion to drive the second member in motion to drive the transmission member back to the first initial position;

15. The surgical instrument of claim 1, wherein the second mechanism is a magnetic element and the transmission member is a magnetic substance;

16. The surgical instrument of claim 15, wherein the magnetic element restrains the transmission member in the first initial position in response to the transmission member reaching the first initial position.