CN107951522B

CN107951522B - Surgical instrument

Info

Publication number: CN107951522B
Application number: CN201711400702.9A
Authority: CN
Inventors: 张翚; 刘殿臣; 杜运峰; 李凡
Original assignee: Suzhou IntoCare Medical Technology Co Ltd
Current assignee: Suzhou IntoCare Medical Technology Co Ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2024-04-09
Anticipated expiration: 2037-12-22
Also published as: CN107951522A

Abstract

The invention relates to a surgical instrument, which comprises an anvil assembly, a nail bin assembly bracket forming a jaw with the anvil assembly and a closing driving assembly driving the jaw to open or close, and also comprises a center bracket, wherein the closing driving assembly comprises a closing shaft arranged on the center bracket and a closing nut in threaded connection with the closing shaft, the closing nut comprises a block part, the nail bin assembly bracket is fixed on the closing nut, a containing cavity is formed in the center bracket, the block part is arranged in the containing cavity, a guide post extending along the longitudinal direction of an end closing shaft is arranged between the containing cavity and the block part, and arc-shaped guide holes matched with the guide post are formed in the containing cavity and the block part.

Description

Surgical instrument

Technical Field

The present invention relates to a surgical instrument.

Background

In general surgical treatment, a surgical instrument is a surgical tool in medical operation, and an anastomat is a surgical tool of a surgical instrument, which is commonly used for completing a cutting and closing function of tissues, and is a device used in medicine instead of manual suturing, and the main working principle is to separate or anastomose the tissues by using titanium nails (suturing nails) similar to a stapler. The prior anastomat comprises a central bracket, an anvil component, a cartridge component bracket forming a jaw with the anvil component and a closing driving component driving the jaw to open or close, wherein the closing driving component drives the cartridge component bracket to move relative to the anvil component so as to realize the opening or closing of the jaw, the cartridge component bracket is generally required to be matched in a containing cavity of the central bracket besides being connected with the closing driving component so as to realize the relative movement between the cartridge components, so that the cartridge component bracket is limited to shake left and right through the containing cavity, in a specific embodiment, a connecting part accommodated in the containing cavity is arranged on the cartridge component bracket and is also connected with the closing driving component, and the connecting part is provided with two extending sheets extending downwards and extending into the containing cavity and contacting with the cavity wall of the containing cavity so as to limit the cartridge component bracket from shaking left and right, but because the extending sheets are in surface contact with the cavity wall, the guiding precision is not high, and the closing is influenced.

Disclosure of Invention

The object of the present invention is to provide a surgical instrument which improves the anastomosis effect.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a surgical instrument, includes the nail anvil subassembly, with nail anvil subassembly forms the nail storehouse subassembly support and the drive of jaw open or closed closure drive assembly, surgical instrument still includes the center support, closure drive assembly is including setting up closure shaft and the threaded connection on the center support are in closure nut on the closure shaft, closure nut includes the cubic portion, nail storehouse subassembly support is fixed on the closure nut, be formed with the accommodation chamber in the center support, the cubic portion sets up the accommodation intracavity, be provided with between accommodation chamber and the cubic portion along the guide post of the lengthwise direction extension of tip closure shaft, all be provided with on accommodation chamber and the cubic portion with guide post complex arc guiding hole.

Further, the guide post is arranged at the corner of the accommodating cavity.

Further, a locking block is formed on the nail anvil component in a protruding mode, the closing nut further comprises a locking piece which extends forwards from the block portion, and a locking hole matched with the locking block is formed in the locking piece.

Further, the locking piece is formed by bending and extending forwards and downwards from the block-shaped part, and the locking hole is a notch formed by bending and extending the locking piece.

In order to achieve the above purpose, the present invention provides the following technical solutions: the surgical instrument comprises a nail anvil assembly, a nail bin assembly bracket and a closing driving assembly, wherein the nail bin assembly bracket and the nail anvil assembly form a jaw, the closing driving assembly drives the jaw to open or close, a containing cavity is formed in the center bracket, a guide column is arranged between the connecting part and the containing cavity, and an arc-shaped guide hole matched with the guide column is formed in the containing cavity and the connecting part.

Further, the nail bin assembly bracket comprises a frame body part used for installing a nail bin assembly and a connecting part formed by extending backwards from the frame body part, the closing driving assembly comprises a closing shaft, the connecting part of the nail bin assembly bracket is movably installed on the closing shaft, and the nail bin assembly bracket moves on the closing shaft along the longitudinal direction of the closing shaft; the nail anvil assembly applies thrust to the frame body of the nail bin assembly bracket, the connecting part of the nail bin assembly bracket can swing along a first direction relative to the closing driving assembly, and the first direction is the direction of force of the nail anvil bracket acting on the nail bin assembly bracket.

Further, the closing drive assembly further comprises a closing nut arranged on the closing shaft, the closing nut is in threaded connection with the closing shaft, the connecting end is provided with a mounting hole, the closing nut is inserted into the mounting hole, and clearance fit is formed between the closing nut and the mounting hole.

Further, the frame body has a leading end disposed away from the connection portion, the leading end being disposed lower than the connection portion.

Further, a firing bar is arranged in the nail anvil assembly, a cutting assembly which is in threaded connection with the firing bar and can move on the firing bar is arranged on the firing bar, the surgical instrument further comprises a trigger switch and a trigger applying piece for triggering the trigger switch, a fixed plate is arranged on one side of the trigger switch, a first elastic piece is arranged on the fixed plate, and the trigger applying piece is arranged on one side of the first elastic piece; the cutting assembly abuts against the trigger applying piece, and when the cutting assembly is triggered to reset, the cutting assembly pushes the trigger applying piece to move towards the trigger switch and trigger the trigger switch; when the cutting assembly is fired, the first elastic member drives the trigger applying member away from the trigger switch and toward the cutting assembly.

Further, the firing bar is sleeved with a sliding block, the sliding block is in clearance fit with the firing bar, the cutting assembly abuts against the trigger applying piece through the sliding block, and one side of the sliding block is provided with a second elastic piece which drives the sliding piece to move towards the cutting assembly.

The invention has the beneficial effects that: the nail bin assembly bracket and the central bracket of the surgical instrument are matched with each other through the guide post and the guide hole, so that the nail bin assembly bracket moves stably, the moving precision is high, and compared with the prior art, the anastomosis effect is improved.

The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a surgical instrument according to a first embodiment of the present invention;

FIG. 2 is an exploded view of the surgical instrument shown in FIG. 1;

FIG. 3 is an exploded view of the end effector, closure shaft and rigid mount of FIG. 1;

FIG. 4 is an exploded view of the anvil assembly, firing bar, and cutting assembly of FIG. 1;

FIG. 5 is a cross-sectional view of a portion of the anvil assembly, firing bar, and cutting assembly of FIG. 1 after assembly;

FIG. 6 is a cross-sectional view of a portion of the assembled anvil assembly, firing bar, and cutting assembly;

FIG. 7 is an assembled view of the firing nut and blade of FIG. 1;

FIG. 8 is an exploded view of the firing nut and blade shown in FIG. 9;

FIG. 9 is an exploded view of the firing bar, firing nut, and recoil positioning identification device of FIG. 1;

FIG. 10 is an exploded view of the cartridge assembly and first identification switch of FIG. 1;

FIG. 11 is a cross-sectional view of the cartridge assembly of FIG. 10;

FIG. 12 is an assembled view of the cartridge assembly of FIG. 1 with a housing;

FIG. 13 is an enlarged view of circle B of FIG. 5;

FIGS. 14 a-14 c are partially exploded views of three end effectors to achieve two closure heights;

FIG. 15 is an exploded view of a portion of the structure of a surgical instrument according to another embodiment of the present invention;

FIG. 16 is an exploded view of the end effector, cartridge assembly, etc. of a surgical instrument according to another embodiment of the present invention.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention. The positional relationship of the upper, lower, left, right, front and rear described below is referred to with reference to fig. 1, in which the arrow a-a direction is the upper and lower direction, the arrow b-b direction is the front and rear direction, and the arrow c-c direction is the left and right direction in fig. 1.

Referring to fig. 1 and 2, a surgical instrument according to an embodiment of the present invention is an electrically driven stapler (hereinafter referred to as a stapler) for stapling and cutting tissue. The stapler includes a gun body and a cartridge assembly 100 mounted on the gun body. The gun body comprises a handle part (not shown) and a working head 10, in this embodiment, the handle part is a reusable sterilizable electric handle, a quick connector and a signal transmission port are arranged in the handle part, a replaceable battery pack for providing electric power is also arranged in the handle part, and a power input device (not shown) for inputting power is arranged in the handle part and comprises a motor. The manner of connection of the motor to the battery is of conventional design in the art and will not be described in detail here. The handle portion drives the closing, opening, firing, and other operations of the working head 10.

The working head 10 includes a housing 1, a center rest 2, a closure transmission assembly (not numbered), a firing transmission assembly (not numbered), a switching member, and an end effector 3. The center support 2 is fixed in the shell 1, the closing transmission assembly and the firing transmission assembly are sealed in the shell 1, one ends of the closing transmission assembly and the firing transmission assembly are connected with a motor through a power transmission assembly (not shown), and the other ends of the closing transmission assembly and the firing transmission assembly are respectively connected with the end effector 3 and supported through the center support 2. The closing and firing transmission assemblies are connected with the handle portion to transmit power of the handle portion to the end effector 3, so that the closing and firing transmission assemblies drive the end effector 3 to close, fire, reset and open, and are of conventional design in the art, and therefore are not described in detail herein. The switching means comprise a switching lever 12 and a switching button 11 connected to said switching lever 12. The switching lever 12 selectively transmits the power of the power input device to the closing drive assembly through the closing transmission assembly or transmits the power of the power input device to the firing lever through the firing transmission assembly, and the switching button 11 is on the housing. The switching rod 12 is driven to move on the closing transmission assembly and the firing transmission assembly by toggling the switching button 11 to realize switching between two states, and the connection mode of the switching rod 12 and the closing transmission assembly and the firing transmission assembly is conventional in the art, so that the switching rod 12 is not described in detail herein.

Referring to fig. 1, 3 and 4, the end effector 3 includes an anvil assembly 31, a cartridge assembly holder 32 that moves relative to the anvil assembly 31 to close or open the end effector 3, a closing drive assembly that drives the cartridge assembly holder 32 in a direction toward the anvil assembly 31 to close or open the end effector 3, and a firing bar 37 disposed within the anvil assembly 31, a cutting assembly 33 disposed on the firing bar 37. The closing or opening of the end effector 3 is accomplished by the anvil assembly 31 and cartridge assembly bracket 32, the anvil assembly 31 and cartridge assembly bracket 32 forming jaws, the closing of which is the closing of the end effector 3 and the opening of which is the opening of the end effector 3. The cartridge assembly 100 is mounted to the cartridge assembly housing 32.

Referring to fig. 3 to 6, the anvil assembly 31 includes an anvil bracket 311, an anvil head 312 disposed on an end of the anvil bracket 311, a transparent shield 313 disposed on the anvil bracket 311, and a anvil seat 314 disposed on the anvil bracket 311. The anvil bracket 311 includes a bottom wall 3114 disposed opposite to each other and side walls 3112 extending from both left and right sides of the bottom wall 3114. The side wall 3112 and the bottom wall 3114 define a receiving cavity (not numbered). The front end of the anvil bracket 311 is embedded with a blocking plug 3113. The nail holder 314 is fixed on the bottom wall 3114 and is disposed opposite to the bottom wall 3114. The bottom wall 3114 is provided with an elongated viewing port 315 extending in the longitudinal direction of the anvil assembly 31 (the same direction as the longitudinal direction of the working head 10, the direction a-a in fig. 1), the transparent shielding plate 313 covers the viewing port 315, in this embodiment, a scale area for marking is provided on the bottom wall 3114, and the scale area is located at one side of the viewing port 315. The nail anvil 312 is detachably inserted into the front end of the nail anvil bracket 311, and the nail anvil 312 is detachably inserted into the front end of the nail anvil bracket 311, so that the nail anvil 312 can be conveniently replaced, the maintenance of the end effector 3 is facilitated, and the service life of the end effector 3 is prolonged. In this embodiment, the anvil head 312 is in snap connection with the anvil bracket 311, specifically: the anvil head 312 includes a head 316 and a hook 317 extending rearward from the head 316, and a latch slot 318 matching with the hook 317 is provided in the anvil bracket 311, and the latch slot 318 is formed on the bottom wall 3114. In this embodiment, referring to fig. 5 and 6, the number of the hook portions 317 is one, and the hook portions 317 include a cantilever 3171 extending rearward from the head 316 and a square-shaped latch 3172 protruding upward from the cantilever 3171 along the height direction of the end effector 3. In other embodiments, referring to fig. 6, the number of the hook portions 317' may be two, the two hook portions 317 are disposed opposite to each other along the central axis of the end effector 3, each hook portion 317' has a cantilever 3171' extending backward from the head 316' and a rounded-head-shaped latch 3172' protruding from the cantilever 3171', and in this embodiment, two sidewalls 3112' are concavely formed with latch grooves 318' that cooperate with the rounded-head-shaped latch 3172 '.

Referring to fig. 3, the cartridge assembly bracket 32 has a cantilever structure, and the cartridge assembly bracket 32 includes a frame portion 321 for fixing the cartridge assembly 100 and a connecting portion 322 extending rearward from the frame portion 321. The frame 321 has a front end 323, the front end 323 of the cartridge module bracket 32 is suspended, and the front end 323 is far away from the connecting portion 322. The connecting portion 322 of the cartridge assembly bracket 32 is movably mounted on the closing driving assembly, the anvil assembly 31 applies a pushing force to the frame body 321 of the cartridge assembly bracket 32, and the connecting portion 322 of the cartridge assembly bracket 32 can swing along a first direction (the direction indicated by an arrow d in fig. 3) relative to the closing driving assembly, wherein the first direction is the direction in which the anvil bracket 311 acts on the cartridge assembly bracket 32. The frame 321 is provided with a clamping groove (not numbered) that cooperates with the cartridge module 100. The connection portion 322 includes a connection piece 324 and extension pieces 325 formed to extend downward from left and right sides of the connection piece 324. The connecting piece 324 is provided with a mounting hole 326, and the mounting hole 326 comprises a shaft hole 327 and a avoiding groove 328 formed by tearing the two ends of the shaft hole 327 outwards.

Referring to fig. 2 and 3, the closure driving assembly includes a closure shaft 34 mounted on the center bracket 2 and a closure nut 35 provided on the closure shaft 34. A conical transmission gear set is arranged between the closing shaft 34 and the closing transmission assembly, the conical transmission gear set comprises a first bevel gear 41 arranged on the closing transmission assembly and a second bevel gear 42 arranged on the support of the center support 2, and one end of the closing shaft 34 is inserted into the second bevel gear 42 and connected through a flat square structure. The closing shaft 34 is screwed with a closing nut 35 provided thereon, the closing nut 35 converting a rotational movement of the closing shaft 34 into a linear movement so that the closing nut 35 can be linearly moved on the closing shaft 34 in a longitudinal direction of the closing shaft 34. The closing nut 35 is inserted into the mounting hole 326, the closing nut 35 is in clearance fit with the mounting hole 326, and the closing nut 35 drives the cartridge assembly bracket 32 to move on the closing shaft 34 along the longitudinal direction of the closing shaft 34. The closure nut 35 includes a pressing portion 351, a shaft portion 352 extending downward from the pressing portion 351, and a lateral projection 353 projecting outward from the shaft portion 352, the shaft portion 352 being inserted into the shaft hole 327 such that the shaft portion 352 is fitted into the shaft hole 327 with a clearance fit between the mounting portion and the shaft hole 327. When the closing nut 35 is assembled with the cartridge component support 32, the lateral projection 353 is aligned with the avoidance groove 328, so that the closing nut 35 is sleeved on the cartridge component support 32, then, the closing nut 35 is rotated to enable the lateral projection 353 to be dislocated with the avoidance groove 328, at this time, the connecting portion 322 of the cartridge component 100 is clamped between the abutting portion 351 and the lateral projection 353, so as to prevent the cartridge component support 32 from being separated from the closing nut 35, and meanwhile, since the cartridge component support 32 is sleeved with the closing nut 35, the shaft portion 352 is a polished rod, and the mounting hole 326 is a light hole, and therefore the cartridge component support 32 and the closing nut 35 can swing relatively slightly. In this embodiment, in order to prevent the cartridge module holder 32 from rotating relative to the closure nut 35, a fixing member 36 is fixed on the cartridge module holder 32, a clamping groove 361 matched with the protrusion 353 is provided on the fixing member 36, the protrusion 353 is located in the clamping groove 361, and the fixing member 36 is located below the connecting portion 322, and in this embodiment, the fixing member 36 is welded with the cartridge module holder 32. The fasteners 36 are received within the cartridge assembly housing 32. The center support 2 has a receiving cavity 21 for receiving the second bevel gear 42 and the closing shaft 34, cavity walls 211 are oppositely arranged on the left side and the right side of the receiving cavity 21, the connecting portion 322 is received in the receiving cavity 21, the connecting portion 322 is adapted in the receiving cavity 21, and the connecting portion 322 can move in the receiving cavity 21 along the longitudinal direction of the closing shaft 34. The two extending pieces 325 of the connecting portion 322 are disposed corresponding to the two cavity walls 211, respectively, and the extending pieces 325 are attached to the cavity walls 211 to limit the cartridge module holder 32 from swinging in the left-right direction of the cartridge module holder 32. In other embodiments, in order to mention the movement precision, a guide post is disposed between the connecting portion 322 and the accommodating cavity 21, and arc-shaped guide holes matched with the guide post are disposed on the accommodating cavity 21 and the connecting portion 322, so that the surface contact is avoided, and the movement precision is improved. The arc-shaped guide hole is provided on the extension piece 325, and indeed, the extension piece 325 may not be provided, and the arc-shaped guide hole is directly formed on the connection piece 324.

The nail cartridge assembly bracket 32 is provided with a pre-bending spring piece 37, the pre-bending spring piece 37 is clamped between the nail cartridge assembly bracket 32 and the housing 1, the pre-bending spring piece 37 comprises a first sheet body portion 371 positioned above the connecting sheet 324, a second sheet body portion 372 arranged above the frame body portion 321, and a folding portion 373 formed by downwards folding the second sheet body portion 372, the folding portion 373 is positioned below the second sheet body portion 372, the folding portion 373 is arranged close to the connecting sheet 324, and the folding portion 373 abuts against the frame body portion 321. A crease is provided between the first sheet portion 371 and the second sheet portion 372. By providing the pre-bent spring 37 between the cartridge module holder 32 and the housing 1, not only can rigid impact be prevented from occurring between the cartridge module holder 32 and the housing 1, but also deflection occurring during closing and opening of the end effector 3 is reduced, which is beneficial to obtaining a better staple formation.

The end effector 3 closing process is as follows: when the closure drive assembly drives the closure shaft 34 through the bevel drive gear in a first rotational direction (which may be clockwise), the closure nut 35 moves downwardly over the closure shaft 34, at which point the closure nut 35 drives the cartridge assembly bracket 32 in the direction of the anvil assembly 31 until the end effector 3 is closed. Since the cartridge module holder 32 has a cantilever structure, in order to ensure the anastomosis effect of the end effector 3, the front end 323 of the cartridge module holder 32 is generally disposed lower than the connecting portion 322, and the purpose of the design is that: if the leading end 323 is flush with the connecting portion 322, the leading end of the cartridge module 100 (the portion of the cartridge module 100 located at the leading end 323 of the cartridge module holder 32) will first contact the stapled and severed tissue during the closing of the end effector 3, at which time the end effector 3 is still fully closed, and if the firing motion is initiated, the stapling effect is poor. Thus, the cartridge assembly carriage 32 must be moved further in the direction of the anvil assembly 31 to effect complete closure of the jaws. In this process, the front end 323 of the cartridge assembly bracket 32 will be slightly lifted upwards by the relative force applied by the front end of the cartridge assembly 100 on the sutured and cut tissue, so that the cartridge assembly bracket 32 swings slightly in the first direction as a whole, and since the cartridge assembly 100 is movably mounted on the closure nut 35, the cartridge assembly bracket 32 can swing in the first direction relative to the closure nut 35, the connecting portion 322 is a weak stress portion, and the weak stress portion is reinforced by setting the front end 323 to be lower than the connecting portion 322, so that the cartridge assembly bracket 32 can be prevented from bending, fatigue damage of the cartridge assembly 100 is reduced, and the service life of the cartridge assembly 100 is prolonged.

To facilitate the fixing of the closing shaft 34, one end of the closing shaft 34 is fixed to the housing 1 and the other end is fixed to the center bracket 2. In this embodiment, the closure shaft 34 is fixed to the housing 1 by a rigid bracket 51. The rigid support 51 is concavely formed with a fixing groove (not shown) which is abutted with the closing shaft, and in this embodiment, a bearing 52 is provided between the rigid support 51 and the closing shaft 34, and the bearing 52 is provided in the fixing groove. The rigid support 51 includes a base plate 511 and an extension arm 512 extending upward from the base plate 511, the extension arm 512 is fastened to the central support 2, and the fixing slot is disposed on the base plate 511. Because the closing shaft 34 is fixed on the shell 1 through the rigid support 51, the problems of damage to the shell 1 and offset of the closing shaft 34 along the axis caused by direct fixation of the closing shaft 34 on the shell 1 in the prior art are solved, the service life of the shell 1 is prolonged, and the closing accuracy is improved.

Referring to fig. 4 and 8, the cutting assembly 33 includes a firing nut 331 threadedly coupled to the firing bar 37 and a blade 332 disposed on the firing nut 331. The extending direction of the firing bar 37 is the same as the longitudinal extending direction of the anvil assembly 31, the blade 332 has a blade surface and a back (not numbered) opposite to the blade surface (not numbered), the back is provided with a concave notch 333 extending from the back toward the blade surface, and the blade 332 forms a buffer backwards when cutting due to the concave notch on the blade surface, which is helpful for prolonging the service life of the blade 332. The blade 332 may be integrally formed with the firing nut 331. In this embodiment, the blade 332 is separately disposed from the firing nut 331, the blade 332 is fixed on the firing nut 331, and the blade 332 and the firing nut 331 may be connected by welding or riveting or by a pin. The firing nut 331 is located in the storage cavity of the cartridge holder 311, the firing nut 331 is exposed in the observation port 315, and the position of the firing nut 331 can be observed through the observation port 315, so that the real-time position of the firing and firing nut 331 is known. In order to visually recognize the position of the firing nut 331, a color difference exists between the firing nut 331 and the anvil assembly 31 and the transparent shield 313.

Referring to fig. 1 and 2, an electric control part is disposed in the gun body, and the electric control part includes a tool withdrawal in-place recognition device, a trigger inductive switch 83 and a closing height recognition device.

Referring to fig. 2 and 9, the retracting-in-place recognition device includes a trigger switch 81 and a trigger applying member 82, which are disposed on the housing 1, the trigger switch 81 may be a photoelectric switch, the trigger applying member 82 is a positioning needle, when the positioning needle 82 is inserted into the photoelectric switch, the trigger switch 81 is triggered, and the electronic control part of the surgical instrument obtains information that the firing nut 331 is retracted to the original position, and the electronic control part can inform the operator of the information by voice control or photoelectric means. A fixing plate 14 is disposed on one side of the trigger switch 81, the fixing plate 14 is fixed on the housing 1, and a first elastic member 15 is disposed on the fixing plate 14. The positioning needle 82 is disposed at one side of the first elastic member 15. The firing nut 331 abuts against the positioning needle 82, and when the firing nut 331 is in firing reset, the firing nut 331 pushes the positioning needle 82 to move towards the trigger switch 81 and triggers the trigger switch 81; when the firing nut 331 fires, the first elastic member 15 drives the positioning needle 82 away from the trigger switch 81 and close to the cutting assembly 33. In specific use, the first elastic member 15 applies a first force on the positioning needle 82, the first force separates the positioning needle 82 from the trigger switch 81 so that the trigger switch 81 is not triggered, the firing nut 331 applies a second force on the positioning needle 82, the second force pushes the positioning needle 82 to move toward the trigger switch 81 so as to trigger the trigger switch 81, the second force is greater than the first force, the first firing position (the position of the firing nut 33 is realized in fig. 4) of the firing nut 331 when the firing rod 37 is defined to be unfired, when the firing nut 331 is located at the first firing position, the firing nut 331 applies a second force to the positioning needle 82, when the firing nut 331 is not located at the first firing position, the second force is withdrawn from the positioning needle 82, and the first force pushes the positioning needle 82 to be separated from the trigger switch 81. In this embodiment, the first elastic member 15 is a spring sleeved on the positioning needle 82, and the positioning needle 82 is provided with a pressing ring 821 for pressing the first elastic member 15. The firing bar 37 is sleeved with a sliding block 16, the sliding block 16 is in clearance fit with the firing bar 37, the firing nut 331 is propped against the positioning needle 82 through the sliding block 16, one side of the sliding block 16 is provided with a second elastic piece 17 for driving the sliding block 16 to move towards the direction of the firing nut 331, and the second elastic piece is specifically: the firing bar 37 includes a thread section 371 in threaded engagement with the firing nut 331 and a polish rod portion 372 extending from the thread section 371 in a longitudinal direction, and the polish rod portion 372 is sleeved with the sliding block 16. The firing nut 331 abuts against the sliding block 16 and pushes the sliding block 16 away from the first firing position, and the firing nut 331 and the second elastic member 17 are disposed at two sides of the sliding block 16. The second elastic member 17 is a spring. Through setting up this tool withdrawal identification means in place can make this surgical instrument can learn whether this firing nut 331 is retreated in place through automatically controlled mode, compares with prior art, can avoid the problem that firing nut 331 retreated in place when this surgical operation is many times fired and is retreated, need not to realize retreating location through calculating driving motor's number of turns, helps improving the quality of operation.

Referring to fig. 1, 2 and 10-13, the staple cartridge assembly 100 includes a cartridge body 91, a plurality of staples (not shown) disposed in the cartridge body 91, a staple pusher (not shown) for driving the staples to move relative to the cartridge body 91, an actuator 92 for driving the staple pusher to move relative to the cartridge body 91, a bracket 93 fastened on the cartridge body 91, a top guard 90 disposed on the cartridge body 91, and a sliding trigger 99 disposed in the cartridge body 91. The trigger switch 83 is used to trigger the trigger switch 83. A plurality of suture needle cavities 94 for accommodating the suture needles are arranged in the bin body 91, the bin body 91 comprises a tissue contact platform 95 and bin body side walls 96, and the suture needle cavities 94 penetrate through the tissue contact platform 95. The slide trigger 99 is disposed in the cartridge body 91, and the slide trigger 99 is pushed by the actuator 92 to change the position in the cartridge body 91. The bin 91 is internally provided with a sliding cavity 97 for accommodating the sliding trigger piece 99, the sliding trigger piece 99 can move in the sliding cavity 97 to change the position of the sliding trigger piece 99, and the sliding trigger piece 99 is pushed to move in the sliding cavity 97 by the actuator 92. In this embodiment, the actuator 92 is generally identical in construction to the prior art actuator, except that: the actuator 92 in this embodiment is provided with a pushing portion 921 for driving the sliding trigger member 99 to move. In order to make the structure of the pushing portion 921 compact, a recess 922 is formed in the actuator 92, and the pushing portion 921 is located behind the recess 922 to form a rear wall of the recess 922. The slip trigger 99 is mounted within the recess 922. A first position and a second position are defined in the cartridge body 91 (in fig. four, the position where the solid-line slide trigger 99 is located is the first position, and the position where the broken-line slide trigger 99 is located is the second position), and the actuator 92 pushes the slide trigger 99 to move from the first position to the second position. The trigger sensitive switch 83 is triggered by the slide trigger 99 being located in the first position. When the actuator 92 pushes the sliding trigger 99 to leave the first position, the sliding trigger 99 is separated from the actuator 92 and enters the second position, and at this time, the sliding trigger 99 located at the second position is dislocated from the trigger sensor 83, and the sliding trigger 99 located at the second position cannot trigger the trigger sensor 83. In this embodiment, the trigger switch 83 is located on the housing 1. The bottom of the sliding cavity 97 has a channel 971 that is inclined outwards, and the sliding trigger 99 is located in the channel 971 and moves along the direction of the channel 971. A third elastic member 98 is further disposed in the bin 91, and the actuator 92 pushes the sliding trigger 99 to move from the first position to the second position, and when the sliding trigger 99 moves to the second position, the third elastic member 98 interferes with the sliding trigger 99 to keep the sliding trigger 99 in the second position. The third elastic member 98 may be a spring. In this embodiment, when the sliding trigger 99 is at the first position, the elastic piece 98 abuts against the bin sidewall 96 of the sliding trigger 99 to prevent the sliding trigger 99 from being separated from the recess 922, and when the sliding trigger 99 is moved to the second position under the driving of the actuator 92, the elastic piece 98 is deformed and moves from the 1 st position to the 2 nd position in fig. 13, at this time, the elastic piece 98 abuts against the rear of the sliding trigger 99, and interference is formed between the elastic piece 98 and the sliding trigger 99 to fix the sliding trigger 99 at the second position. For ease of sensing, a sensing window (not numbered) is provided in cartridge assembly 100 that specifically views sidewall 3112 and bracket 93, and exposes slide trigger 99 when slide trigger 99 is in the first position. In the present embodiment, the elastic piece 98 is formed on the bracket 93. In specific use, the trigger inductive switch 83 is a hall switch, and the sliding trigger piece 99 is a magnet for triggering the hall switch; alternatively, the trigger sensing switch 83 is a reflective photoelectric switch, and the sliding trigger 99 is a reflective member for triggering the reflective photoelectric switch. In a specific implementation, since the sliding trigger piece 99 pushed by the actuator 92 to change the position in the bin body 91 is arranged in the bin body 91, whether the nail bin assembly 100 is used or not can be judged according to the position of the sliding trigger piece 99, and when the surgical operation instrument is used, the electric control part is provided with the trigger piece triggered by the sliding trigger piece 99, so that whether the nail bin assembly 100 is fired or not can be identified through electric control, and medical accidents can be avoided.

Referring to fig. 14a, the closing height identifying means includes a first sensing means 85 and a second sensing means 86 disposed along the moving direction of the cartridge module 100 rack 32 and used for sensing the cartridge module 100 rack 32; the first sensing device 85 and the second sensing device 86 are disposed at different heights corresponding to the closing height of the jaws in the closing direction of the jaws. The first sensing means 85 and the second sensing means 86 sense the extension piece 325, and the photoelectric switch may be disposed on the center support 2. The first sensing device 85 and the second sensing device 86 are disposed on the same side of the cartridge assembly housing 32 as the cartridge assembly housing 32. Referring to fig. 14b, in other embodiments, the first sensing device 85 and the second sensing device 86 can also be disposed on opposite sides of the cartridge assembly housing 32 relative to the cartridge assembly housing 32. In fig. 14a and 14b, the first sensing device 85 and the second sensing device 86 are all photoelectric switches, and when the end effector 3 is closed, the photoelectric switches located at different height positions are respectively blocked by the extension piece 325, so as to identify two different closing heights of the end effector 3, and complete the closing height of the electrically controlled feedback end effector 3. Indeed, the first sensing device and the second sensing device may be hall switches, and at this time, a magnet for triggering the first sensing device and the second sensing device needs to be disposed on the anvil assembly.

In other embodiments, when the anvil assembly 31 is a moving member, the closing driving assembly drives the anvil assembly 31 to move toward the cartridge assembly bracket 32 to close or open the jaws, and at this time, the first sensing device 85 and the second sensing device 86 are disposed along the moving direction of the anvil assembly 31 and are used for sensing the anvil assembly 31; the first sensing device 85 and the second sensing device 86 are disposed at different heights corresponding to the closing height of the jaws in the closing direction of the jaws. The first sensing device 85 and the second sensing device 86 may also be photoelectric switches. Similarly, the first sensing device 85 and the second sensing device 86 may also be hall switches, so magnets for triggering the first sensing device 85 and the second sensing device 86 need to be disposed on the anvil assembly 31. The number of the induction devices can be more than two according to actual requirements.

In addition, referring to fig. 14c, the closing height identifying device may also be a photoelectric switch disposed in the moving direction of the cartridge module bracket 32, and the extending piece 325 is provided with an opening matching with the photoelectric switch, so that the photoelectric switch is blocked or transparent, and thus the photoelectric switch obtains two different working states to identify two different closing heights of the end effector 3. In this embodiment, the cartridge assembly mount 32 translates along the longitudinal direction of the closure shaft 34. This embodiment can also be changed to: an electro-optical switch is disposed in the moving direction of the anvil assembly 31, the anvil assembly 31 has an extension piece 325 extending toward the cartridge assembly holder 32, and an opening 329 is formed on the extension piece 325 to be matched with the electro-optical switch.

The second cartridge component identifying switch is provided with two or more sensing devices for sensing the cartridge component support 32 in the moving direction of the cartridge component support, or is provided with two or more sensing devices for sensing the anvil component 31 in the moving direction of the anvil component 31, or is provided with a photoelectric switch in the moving direction of the cartridge component support 32 or the anvil component 31, and then is provided with an opening 329 matched with the photoelectric switch in the corresponding anvil component 31 or the cartridge component support 32, so that two different closing heights of the end effector 3 are identified, and tissues with different thicknesses can be sutured by only one surgical instrument, thereby having wide applicability.

Referring to fig. 15 and 16, the stapler according to another embodiment of the present invention has substantially the same structure as the stapler according to the first embodiment, but has three important differences as follows: 1. the closed transmission assembly and the firing transmission assembly form a switching module, the structure of the second end effector, the structure of the third lock nut and the central bracket 2'. A switch box 20' is arranged in the shell 1', the closing transmission assembly, the firing transmission assembly and the switch rod 12' are arranged in the switch box 20', and a connection opening (not numbered) for the switch rod 12' to extend out to be connected with the switch button 11' is formed in the switch box 20 '. The closed transmission assembly and the firing transmission assembly are arranged in the switching box, so that a modularized structure is realized, and the assembly is convenient. The end effector includes an anvil assembly, a cartridge assembly support 32 that moves relative to the anvil assembly to complete the end effector closing or opening, a closing drive assembly that drives the cartridge assembly support 32' in a direction toward the anvil assembly to close or open the end effector, and a cutting assembly disposed on the anvil assembly. The structure of the cutting assembly and the anvil assembly is the same as that of the first embodiment, and the anvil bracket 311' includes a locking block 318' protruding from the side wall 3112', which will not be described again. The cartridge module bracket 32 'includes a top plate 321' and extension arms 322 'extending downward from left and right sides of the top plate 321', the top plate 321 'and the extension arms 322' enclose a cartridge chamber (shown in the figure) for mounting the cartridge module 100, and an axle hole 327 'is formed at one end of the top plate 321'. The closure driving assembly comprises a closure shaft 34 'provided on the central bracket 2' and a closure nut 35 'screw-coupled with the closure shaft 34'. The closure drive assembly is also connected to the closure drive assembly by a conical drive gear set. The closing nut 35' includes a block portion 351', a locking piece 352' is formed by extending forward from the block portion 351', a locking hole 353' is formed in the locking piece 352' and cooperates with the locking piece 318', in this embodiment, the locking piece 352' is formed by bending and extending forward and downward from the block portion 351', and the locking hole 353' is a notch formed by bending and extending the locking piece 352 '. The block 351 'has a screw hole 354' formed therethrough, which is screw-fitted with the closing shaft 34', and the closing shaft 34' is inserted into the shaft hole 327 'of the cartridge module holder 32' through the screw hole 354', and the cartridge module holder 32' and the closing shaft 34 'are fixed by the bearing 52'. The block 351 'is disposed in the accommodating cavity 21', a guide post (not shown) extending along the closing direction of the end effector is disposed between the accommodating cavity 21 'and the block 351', and arc-shaped guide holes 22 'matched with the guide posts are disposed on the accommodating cavity 21' and the block 351', in this embodiment, the guide posts are disposed at corners of the accommodating cavity 21'. Through setting up nail storehouse subassembly support 32' on closure nut 35', set up closure nut 35' again in holding chamber 21', through setting up the guide post in cubic portion 351', holding chamber 21' and the cubic portion 351' on all be provided with guide post complex arc guiding hole 22' to can restrict nail storehouse subassembly support and swing along fore-and-aft direction, compared with prior art, the removal of nail storehouse subassembly support 32' is more steady, improves the anastomotic effect of end effector.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The surgical instrument comprises an anvil assembly, a cartridge assembly bracket forming a jaw with the anvil assembly and a closing driving assembly driving the jaw to open or close, and is characterized by further comprising a center bracket, wherein the closing driving assembly comprises a closing shaft arranged on the center bracket and a closing nut in threaded connection with the closing shaft, the closing nut comprises a block part, the cartridge assembly bracket is fixed on the closing nut, a containing cavity is formed in the center bracket, the block part is arranged in the containing cavity, a guide post extending along the longitudinal direction of an end closing shaft is arranged between the containing cavity and the block part, and arc-shaped guide holes matched with the guide post are formed in the containing cavity and the block part; the nail bin assembly bracket comprises a bracket body part used for installing a nail bin assembly and a connecting part formed by extending backwards from the bracket body part, wherein the nail anvil assembly is used for applying thrust to the bracket body part of the nail bin assembly bracket, the connecting part of the nail bin assembly bracket can swing along a first direction relative to the closing driving assembly, and the first direction is the direction of force of the nail anvil assembly acting on the nail bin assembly bracket.

2. The surgical instrument of claim 1, wherein the guide post is disposed at a corner of the receiving cavity.

3. The surgical instrument of claim 2, wherein the anvil assembly has a locking tab formed thereon and the closure nut further comprises a locking tab extending forwardly from the block portion, the locking tab having a locking aperture formed thereon that mates with the locking tab.

4. A surgical instrument according to claim 3, wherein the locking tab is formed from the block portion by a bending extension forwardly and downwardly, and the locking aperture is a notch formed by the bending extension of the locking tab.

5. A surgical instrument comprising an anvil assembly, a cartridge assembly bracket forming a jaw with the anvil assembly and a closure drive assembly driving the jaw to open or close, characterized in that the surgical instrument further comprises a center bracket, the cartridge assembly bracket comprises a frame body part for installing a cartridge assembly and a connecting part formed by extending backwards from the frame body part, the closure drive assembly comprises a closure shaft arranged on the center bracket, the connecting part of the cartridge assembly bracket is movably arranged on the closure shaft, and the cartridge assembly bracket moves on the closure shaft along the longitudinal direction of the closure shaft; the method comprises the steps that pushing force is applied to a frame body of the nail bin assembly bracket by the nail anvil assembly, the connecting part of the nail bin assembly bracket can swing along a first direction relative to the closing driving assembly, and the first direction is the direction of force of the nail anvil assembly acting on the nail bin assembly bracket; the center support is internally provided with a containing cavity, a guide column is arranged between the connecting part and the containing cavity, and arc-shaped guide holes matched with the guide column are formed in the containing cavity and the connecting part.

6. The surgical instrument of claim 5, wherein the closure drive assembly further comprises a closure nut disposed on the closure shaft, the closure nut threadably coupled to the closure shaft, the coupling portion having a mounting hole into which the closure nut is inserted, the closure nut being a clearance fit with the mounting hole.

7. The surgical instrument of claim 1 or 5, wherein the frame portion has a leading end disposed away from the connecting portion, the leading end being disposed below the connecting portion.

8. The surgical instrument of claim 1 or 5, wherein a firing bar is disposed within the anvil assembly, a cutting assembly is disposed on the firing bar that is threadably coupled to the firing bar and is movable on the firing bar, the surgical instrument further comprising a trigger switch and a trigger applicator that triggers the trigger switch, one side of the trigger switch being provided with a fixed plate, the fixed plate being provided with a first elastic member, the trigger applicator being disposed on one side of the first elastic member; the cutting assembly abuts against the trigger applying piece, and when the cutting assembly is triggered to reset, the cutting assembly pushes the trigger applying piece to move towards the trigger switch and trigger the trigger switch; when the cutting assembly is fired, the first elastic member drives the trigger applying member away from the trigger switch and toward the cutting assembly.

9. The surgical instrument of claim 8, wherein the firing bar is sleeved with a glide block that is in clearance fit with the firing bar, the cutting assembly is held against the trigger applicator by the glide block, and a second elastic member is disposed on one side of the glide block that drives the glide block to move in the direction of the cutting assembly.