CN108113722B

CN108113722B - Surgical instrument

Info

Publication number: CN108113722B
Application number: CN201711397071.XA
Authority: CN
Inventors: 张翚; 刘殿臣; 徐荣华
Original assignee: Suzhou IntoCare Medical Technology Co Ltd
Current assignee: Suzhou IntoCare Medical Technology Co Ltd
Priority date: 2017-12-21
Filing date: 2017-12-21
Publication date: 2024-05-28
Anticipated expiration: 2037-12-21
Also published as: CN108113722A

Abstract

The invention relates to a surgical instrument, which is characterized in that a first positioning block and a second positioning block are arranged between a front jaw arm and a tissue contact platform, and the first positioning block and the second positioning block are positioned at two sides of a stitching nail contact area in the height direction of a stitching anvil, so that when the surgical instrument is closed, the stitching anvil, the stitching nail contact area, the first positioning block and the second positioning block are surrounded to form a parallelogram frame, thereby avoiding the problems that the formed stitching nail is a stitching nail size head and a stitching dovetail, and improving stitching effect; the trigger piece is arranged on the nail pushing plate, and the induction device which forms an identification switch with the trigger piece is arranged on the gun body matched with the trigger piece, so that whether the nail bin assembly is fired or not is identified through the position of the induction device induction trigger piece, and medical accidents are avoided.

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 a linear anastomat is a surgical tool of a surgical instrument, which is commonly used for performing a tissue cutting and anastomosis function, and is a device used in medicine instead of manual suturing, and the main working principle is to separate or anastomose tissues by using titanium nails (staples), similar to a stapler. The cartridge assembly in the existing linear anastomat is a disposable part, after the use, since the titanium nails are fired, when the cutting suture is needed to be used again, the old cartridge assembly of the linear anastomat needs to be unloaded and a new cartridge assembly is reinstalled, but because the tension atmosphere of the operation and the naked eyes are difficult to recognize whether the cartridge assembly is fired, the fact that a doctor reinstalls the already fired cartridge assembly to an end effector can happen in the operation process, so that medical accidents are caused.

Disclosure of Invention

The invention aims to provide a surgical instrument, which can identify whether a nail bin assembly is fired or not in a stepping way so as to avoid medical accidents, and can also avoid the problems that formed staples are formed into a large head and a dovetail, and improve the suturing effect.

In order to achieve the above purpose, the present invention provides the following technical solutions: a surgical instrument for suturing and cutting tissue, the surgical instrument comprising a gun body and a nail bin assembly arranged on the gun body, wherein an electric control part is arranged in the gun body, the gun body comprises a closing rod, a firing rod, a nail anvil bracket and a nail anvil, the nail anvil bracket comprises a front jaw arm in a cantilever state, the nail anvil is fixed on the front jaw arm, the nail bin assembly is connected with the firing rod and the closing rod and comprises a bin body, a suturing nail arranged in the bin body, a nail pushing plate used for pushing the suturing nail out of the bin body and a cutting assembly capable of moving relative to the bin body, the bin body is provided with a tissue contact platform, the nail anvil faces the tissue contact platform, the nail anvil is provided with a suturing nail contact area contacted with the suturing nail, and a first positioning block and a second positioning block are arranged between the front jaw arm and the tissue contact platform; when the surgical instrument is closed, the first positioning block and the second positioning block are respectively clamped between the nail anvil bracket and the tissue contact platform of the nail bin; in the height direction of the nail anvil, the first positioning block and the second positioning block are positioned at two sides of the stitching nail contact area; the nail anvil, the stitching nail contact area, the first positioning block and the second positioning block are surrounded to form a parallelogram frame, a trigger piece is arranged on the nail pushing plate, and the control part comprises an induction device which is arranged on the nail anvil bracket to form an identification switch with the trigger piece.

Further, a plurality of suture nail cavities for accommodating suture nails are formed in the bin body, the nail pushing plate comprises a plurality of nail pushing sheets which correspond to the suture nail cavities and are used for pushing out the suture nails from the suture nail cavities, fixing portions for fixing the nail pushing sheets, and clamping blocks formed by downwards protruding from the lower surfaces of the fixing portions, and the triggering pieces are embedded in the clamping blocks.

Further, a visual observation window for displaying the position of the nail pushing plate is formed in the bin body; when the cartridge assembly is unfired, a portion of the ejector plate is exposed by the visual viewing window, and when the ejector plate ejects the staples from within the stapling cavity, the ejector plate is remote from the visual viewing window.

Further, the bin body further comprises two extending guard plates which are formed by extending backwards from the stitching nail installation part and are oppositely arranged, the nail pushing plate is arranged between the two extending guard plates, and a clamping structure used for limiting the fixing part to move relative to the bin body is arranged in front of the extending guard plates and the nail pushing plate.

Further, the clamping structure comprises a guard plate clamping groove formed in the extension guard plate and a positioning clamping block formed on the fixing part; when the staple pushing plate pushes out the staples from the staple cavities, the positioning clamping blocks are clamped in the guard plate clamping grooves.

Further, an installation cavity is formed in the cutting assembly, the firing bar is inserted into the installation cavity, the installation cavity is provided with a side wall, an avoidance groove is formed in the side wall, the firing bar is provided with an insertion end inserted into the installation cavity and a longitudinal part which extends backwards from the insertion end to form and penetrates through the avoidance groove, a protruding block is arranged on the insertion end, and the side wall limits the protruding block to be separated from the installation cavity in the opposite direction of the staple discharging direction.

Further, the frame formed by surrounding the nail anvil, the stitching nail contact area, the first positioning block and the second positioning block is square.

Further, the thickness of the first positioning block is equal to that of the second positioning block.

Further, the nail anvil bracket further comprises a rear jaw arm and a lower jaw arm, the front jaw arm, the rear jaw arm and the lower jaw arm are arranged in a surrounding manner to form the U-shaped clamp oral cavity, a sliding groove extending along the nail outlet direction of the suture nail is formed in the lower jaw arm, the second positioning block is arranged in the sliding groove and slides in the sliding groove, a first spring is further arranged in the sliding groove, and the first spring is compressed or expanded along the sliding direction of the second positioning block; when the pushing force exerted on the second positioning block by the nail bin is removed, the first spring pushes the second positioning block to be far away from the nail anvil.

Further, the upper tissue positioning needle which can move along the stapling direction of the stapling nail and can be inserted into the stapling nail anvil is arranged on the stapling nail bin assembly, the lower tissue positioning needle which can be inserted into the stapling nail bin assembly is arranged on the stapling nail anvil bracket, and the upper tissue positioning needle and the lower tissue positioning needle are positioned at two sides of the stapling nail contact area in the longitudinal direction of the stapling nail anvil.

The invention has the beneficial effects that: the surgical instrument provided by the invention can identify whether the nail bin assembly is fired or not by sensing the position of the trigger piece through the sensing device, and the surgical instrument can be accurately used by arranging the first positioning block and the second positioning block, and the suture effect is improved, so that the surgical instrument is beneficial to improving the operation efficiency and effect.

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

Drawings

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

FIG. 2 is a schematic view of the structure of the cartridge assembly shown in FIG. 1;

FIG. 3 is an exploded view of the cartridge assembly shown in FIG. 2;

FIG. 4 is a schematic view of the surgical instrument of FIG. 1 in a closed configuration;

FIG. 5 is a cross-sectional view of the surgical instrument illustrated in FIG. 4 in an unoccluded state;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is an enlarged view of a portion of the structure of the surgical instrument illustrated in FIG. 1 in a top view;

FIG. 8 is a cross-sectional view of a portion of the structure of FIG. 7 from another perspective (in an unfired state);

FIG. 9 is a cross-sectional view of a portion of the structure of FIG. 7 from another perspective (in a fired state);

FIG. 10 is an enlarged view of circle A of FIG. 8;

fig. 11 is an enlarged view of circle B in fig. 9.

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.

Referring to fig. 1, 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 10 and a cartridge assembly 20 mounted on the gun body 10. Referring to fig. 2 and 3 in combination with fig. 6 and 7, the cartridge assembly 20 includes a cartridge body 11, staples (not shown) and upper tissue positioning needles 12 mounted within the cartridge body 11, a pusher plate 13 for pushing staples out of the cartridge body 11, a cutting assembly 14 movable relative to the cartridge body 11, and a staple guard plate 2 mounted on the cartridge body 11. In this embodiment, the cutting assembly 14 includes a tool holder 141 and a blade 142 fixed to the tool holder 141, and the tool holder 41 is provided with a mounting cavity 143 and a clamping slot 140 for fixing the blade 142, and the clamping slot 140 is opened toward the staple discharging direction. The mounting cavity 143 has a first wall 144, a second wall 145, a third wall 146, a fourth wall 147 and a top wall 148 forming the mounting cavity 143, the first wall 144 and the second wall 145 are located on both sides of the mounting cavity 143 in the staple discharging direction of the staples, the third wall 146 and the fourth wall 147 are located on both sides of the mounting cavity 143 in the thickness direction of the cartridge assembly 20, and the top wall 148 is located above the mounting cavity 143 in the mounting direction of the cartridge assembly 20. The second wall 145 is provided with a relief groove (not numbered). The cartridge body 11 comprises a staple mounting part 111, two extending guard plates 112 which are formed by extending backwards from the staple mounting part 111 (the direction is opposite to the staple discharging direction) and are oppositely arranged, and an upper positioning needle mounting part 113 which is formed by extending backwards from the top of the staple mounting part 111, wherein the upper positioning needle mounting part 113 is positioned above the two extending guard plates 112, and the two extending guard plates 112 are connected and perpendicular to the positioning needle mounting part 113. The staple mounting portion 111 has a tissue contact platform (not shown) contacting the tissue (not shown) to be stapled and cut, and a bottom surface (not shown) opposite to the tissue contact platform, a plurality of staple cavities (not shown) are formed in the staple mounting portion 111, a plurality of staples are mounted in the staple cavities through the tissue contact platform and the bottom surface, one staple is mounted in each staple cavity, each staple is held in the staple cavity by two bending rods, and the staple pushing plate 13 pushes the staples out of the staple cavities when the staples are ejected. The staple mounting portion 111 is provided with a first knife slot (not shown) extending in a longitudinal direction of the staple mounting portion 111 (the longitudinal direction is perpendicular to a staple discharging direction of the staples), the first knife slot penetrates through the tissue contact platform and the bottom surface, and when cutting the tissue, the blade 142 enters the first knife slot and extends out of the first knife slot to complete the cutting of the tissue. A receiving chamber (not numbered) is formed between the two extension shields 112, and a circular bump 114 is formed on the extension shield 112. The upper positioning needle mounting portion 113 is provided with a first channel 115 and a second channel 116 extending along the staple discharging direction of the staples, the first channel 115 is located above the second channel 116, and the upper tissue positioning needle 12 is disposed in the first channel 115 and can move in the first channel 115 along the staple discharging direction and the opposite direction of the staples. The ejector plate 13 includes a plurality of ejector pins 131 disposed corresponding to the staple cavities and configured to eject staples from the staple cavities, a fixing portion 132 configured to fix the plurality of ejector pins 131, and a trigger applying member 133 fixed to the fixing portion 132. The ejector blade 131 may be inserted into the staple cavity to remove the staples from the staple cavity to effect staples. The ejector plate 131 is formed to extend forward (in a direction opposite to the stapling direction) from the front end surface of the fixing portion 132. The upper end of the fixing portion 132 is inserted into the second channel 116, and the fixing portion 132 is inserted into the second channel 116, so that the movement direction of the ejector plate 13 is limited, the ejector plate 13 is provided with a second knife slot 134, the second knife slot 134 is arranged corresponding to the first knife slot, and when cutting tissue, the blade 142 passes through the second knife slot 134 and then enters the first knife slot. The process of the stapling nail discharging is as follows: the blade 142 passes through the second slot 134 and then enters the first slot until the knife rest 41 abuts against the fixing portion 132, and then pushes the fixing portion 132 to move forward until the pushing piece 131 enters the staple cavity to push out the staples. In this embodiment, the nail pushing plate 13 further includes a locking block 135 formed to protrude downward from a lower surface of the fixing portion 132, the trigger applying member 133 is inserted into the locking block 135, and an insertion groove 136 (see fig. 6) for inserting the trigger applying member 133 is provided at a bottom of the locking block 135 for facilitating installation of the trigger applying member 133.

To facilitate the observation of whether the gun body 10 is to be mounted or whether the cartridge assembly 20 mounted on the gun body 10 has been fired, in this embodiment, the cartridge body 11 is provided with a visual observation window 118 for displaying the position of the ejector plate 13; when the cartridge assembly 20 is not fired, a portion of the ejector plate 13 is exposed by the visual viewing window 118, and when the ejector plate 13 ejects the staples from the stapling cavity to complete firing, the ejector plate 13 is spaced away from the visual viewing window 118 so that the ejector plate 13 is not exposed within the visual viewing window 118. To facilitate explanation of the movement of the ejector plate 13, the position of the ejector plate 13 may be defined as a first position before firing of the cartridge assembly 20 and a second position after firing of the cartridge assembly 20, the ejector plate 13 being exposed within the visual inspection window 118 when the ejector plate 13 is in the first position, the visual inspection window 118 being offset from the ejector plate 13 when the ejector plate 13 is in the second position, the ejector plate 13 not being exposed within the visual inspection window 118. The visual inspection window 118 is located on one side of the second channel 116 and exposes a portion of the second channel 116. In this embodiment, in order to visually observe whether the ejector plate 13 is exposed in the visual observation window 118, the color of the ejector plate 13 has a color difference with the color of the second channel 116 and the color of the visual observation window 118. The ejector plate 13 and the cutting assembly 14 are arranged in the receiving cavity, and after stapling, the ejector plate 13 is kept in the second position by friction between the ejector plate 13 and the stapling cavity. In order to ensure that the ejector plate 13 is able to remain in the second position of the ejector plate 13, a snap-fit structure may be provided between the ejector plate 13 and the extension shield 112 to limit movement of the ejector plate 13. Specifically, in this embodiment, the extension guard plate 112 is provided with a guard plate clamping slot 1121, and the fixing portion 132 is provided with a positioning clamping block 137 that is matched with the guard plate clamping slot 1121; the staple pushing plate 13 pushes staples out of the staple cavities, and the guard clamping groove 1121 cooperates with the positioning clamping block 137 to limit the movement of the fixing portion 132 relative to the cartridge body 11. The guard plate clamping groove 1121 and the positioning clamping block 137 form a clamping structure, in other embodiments, the clamping structure may be other structures, or a clamping groove is provided on the fixing portion 132, and a clamping block matched with the clamping groove is provided on the extension guard plate 112. In this embodiment, each of the extension shields 112 includes a first plate body 1122 formed by extending rearward from the staple mounting portion 111 and a second plate body 1123 formed by extending rearward from the first plate body 1122, and the shield engaging groove 1121 is formed in the first plate body 1122. The second plate body 1123 is provided with a guide groove 1124 extending along the staple discharging direction of the staples, the center line of the guard plate clamping groove 1121 and the center line of the guide groove 1124 overlap, the guide groove 1124 and the guard plate clamping groove 1121 are communicated, and the positioning clamping block 137 can move from the inside of the guide groove 1124 to the inside of the guard plate clamping groove 1121. The guide groove 1124 is matched with the positioning clamping block 137 to ensure that the nail pushing plate 13 moves stably relative to the bin 11. In this embodiment, the guide groove 1124 and the guard plate locking groove 1121 are located on one of the extending guard plates 112, and in other embodiments, the guide groove 1124 and the guard plate locking groove 1121 may be provided on both extending guard plates 112. In this embodiment, the tool rest 41 is formed with a protruding guide block 149 that cooperates with the guide slot 1124, and the cooperation of the guide block 149 and the guide slot 1124 can make the tool rest 41 move smoothly.

In this embodiment, the cartridge body 11 is provided with a plurality of first anti-slip ribs 119 to facilitate gripping the cartridge body 1. Before the nail bin assembly 20 is fired, the nail protection plate 2 needs to be removed from the nail bin assembly 20, the nail protection plate 2 comprises a clamping part 21 used for clamping the bin body 11 and a pressing part 22 used for driving the clamping part 21 to clamp the bin body 11, and a plurality of second anti-slip protruding ribs 23 are arranged on the pressing part 22.

Referring to fig. 1 and fig. 4 to fig. 6, the gun body 10 includes a handle portion 3 and a working head 4, in this embodiment, the handle portion 3 is a reusable and sterilizable electric handle, a quick connector and a signal transmission port are disposed inside the handle portion 3, a replaceable battery pack for providing electric power is further disposed inside the handle portion 3, and the handle portion 3 is of a prior art structure, so that the details thereof will not be described herein. The handle 3 drives the closing, opening, firing, and other operations of the working head 4. The working head 4 comprises a shell 41, a transmission assembly 45, a closing rod 42, a firing rod 43, an anvil bracket 44, an anvil 46 and a connecting piece 47. The transmission assembly 45 is arranged in the shell 41 and is in butt joint with the handle part 3, the closing rod 42 and the firing rod 43 extend out of the shell 41, the closing rod 42 and the firing rod 43 are connected with the transmission assembly 45 and driven by the transmission assembly 45, the closing rod 42 and the firing rod 43 extend into the nail anvil bracket 44, the nail anvil bracket 44 is fixed on the shell 41 by the connecting piece 47, the connecting piece 47 is two opposite sheet-shaped bodies, and the firing rod 43 and the closing rod 42 are arranged between the two sheet-shaped bodies. The anvil 46 is disposed on the anvil bracket 44. The anvil bracket 44 includes a front jaw arm 441 and a rear jaw arm 442, which are disposed opposite to each other, and a lower jaw arm 443 connecting the front jaw arm 441 and the rear jaw arm 442, wherein one end of the front jaw arm is fixed to the lower jaw arm 443, and the other end is free. The front, rear and lower jaw arms 441, 442, 443 are enclosed to form a U-shaped jaw cavity 445, and the firing bar 43, 42 extends into the U-shaped jaw cavity 445 from the rear of the rear jaw arm 442. The cartridge assembly 20 is disposed within the U-shaped jaw cavity 445.

Referring to fig. 3 and 7-11, the firing bar 43 is inserted into the mounting cavity 143, and in order to facilitate the docking of the firing bar 43 with the mounting cavity 143, an insertion port (not shown) is disposed on a side of the mounting cavity 143 opposite to the top wall 148, and the firing bar 43 is inserted into the mounting cavity 143 from the insertion port. The firing bar 43 has a mating end 431 that is inserted into the mounting cavity 143 and a longitudinal portion 432 that extends rearward from the mating end 431 and through the relief slot 149, the longitudinal portion 432 extending into the housing 41 for connection with the transmission assembly 45. The plug end 431 is provided with a bump 433. The second wall 145, the third wall 146 and the fourth wall 147 have a missing portion (not numbered), the second wall 145 limits the protrusion 433 from being separated from the mounting cavity 143 in a direction opposite to the staple discharging direction, and the third wall 146 and the fourth wall 147 limit the protrusion 433 from being separated from the mounting cavity 143 in a width direction of the cartridge module 20. The front end surface of the insertion end 431 is arc-shaped, and the front end surface pushes against the first wall 144, so that the cutting assembly 14 moves towards the staple discharging direction. The top wall 148 and the second wall 144 are surrounded with a hook slot 1431, the insertion end 431 is formed with a clamping block portion 434 inserted into the hook slot 1431, and the amplitude of the shake of the cutting assembly 14 on the firing bar 43 is limited by the cooperation of the hook slot 1431 and the clamping block portion 434 (see fig. 10 and 11). Since the firing bar 43 is inserted into the mounting cavity 143 of the cutting assembly 14 and the protrusion 43 is provided on the firing bar 43, a clamping connection is formed between the firing bar 43 and the cutting assembly 14, when the firing bar 43 drives the cutting assembly 14 to fire to cut tissue, the firing bar 43 is retracted to draw the cutting assembly 14 back to the unfired position. Referring to fig. 8 and 9, for convenience in describing the change in position of the push plate 131, a first state position 100 and a second state position 100' are defined in fig. 8 and 9, fig. 8 is a state in which the cartridge assembly 20 is in an unfired state, fig. 9 is a state in which the cartridge assembly 20 is in a fired state, during the firing process, the front end surface of the firing bar 43 pushes against the first wall 144 in the mounting cavity, so that the cutting assembly 14 moves in the staple ejection direction and pushes against the fixing portion 132 of the push plate 13 to move the push plate 13 simultaneously in the staple ejection direction, and when staples are ejected, there is a difference in pressure applied to each staple, therefore, the opposite staples will generate a pushing force to the ejector pin plate 131, after the ejector pin plate 131 receives the pushing force, the pushing force is transmitted to the cutting assembly 14, and because the front end surface of the firing bar 43 is arc-shaped, the cutting assembly 14 can move along the arc direction on the front end surface under the action of the pushing force, when the cutting assembly 14 moves relative to the firing bar 43, the cutting assembly 14 drives the ejector pin plate 13 to move, and the ejector pin plate 131 changes from the first state position 100 to the second state position 100', and the ejector pin plate 131 swings by an angle a. Referring to fig. 10 and 11, when the cutting assembly 14 moves relative to the firing bar 43, the position of the latch portion 434 within the latch slot 1431 changes accordingly. In this embodiment, the front end surface of the firing bar 43 is configured to be arc-shaped, so that the angle of the nail pushing sheet 131 can be adjusted during firing, the consistency of the nail pushing sheet and the nail anvil is ensured, and the nail pushing sheet can adapt to different tissue thicknesses, and the angle is adjusted according to the different tissue thicknesses. Indeed, in other embodiments, the front face may also be tapered, but with a relatively arcuate shape, the taper is prone to rigid impact and the taper has a pointed portion that is prone to damage to the cutting assembly 14. In addition, the front end face of the surgical instrument is arranged into an arc shape or a conical shape, and the nail anvil bracket can be designed without pre-bending, so that the surgical instrument is simpler in design and manufacture.

The closure bar 42 is provided with a circular recess (not numbered) which mates with a circular boss 114 on the extension panel. The anvil 46 is fixed on a front jaw arm 441, the anvil 46 faces the bin 11, the anvil 46 is opposite to the tissue contact platform of the bin 11, the anvil 46 has a staple contact area (not numbered) which contacts with staples in the bin 11 to apply pressure to the staples to bend the staples and is B-shaped, an upper tissue positioning hole 444 is formed on the front jaw arm 441, when the stapler is closed, the upper tissue positioning needle 12 is inserted into the upper tissue positioning hole 444 to fix the stapled and cut tissue, in this embodiment, a deflector 421 is arranged on the closing rod 42, the deflector 421 abuts against the rear side of the upper tissue positioning needle 12, and when the closing rod 42 drives the staple bin assembly 20 to move in the direction of the anvil 46, the deflector 421 drives the upper tissue positioning needle 12 to move in the upward tissue positioning hole 444 in the first channel 115 until being inserted into the upper tissue positioning hole 44, so that the stapled and cut tissue can be positioned and cut later by the upper tissue positioning needle 12. The anvil bracket 44 has a lower tissue positioning needle 47 disposed thereon, the lower tissue positioning needle 47 being insertable into the cartridge assembly 20. The lower tissue positioning needle 47 is fixed to the front jaw arm 441, and the upper tissue positioning needle 12, the lower tissue positioning needle 47 are located on both sides of the staple contact zone in the longitudinal direction of the anvil.

An electric control part is arranged in the gun body 10 and is connected with the quick connector, the signal transmission port and the replaceable battery pack, and the electric control part controls the closing, opening, firing and other actions of the working head 4. The manner in which the electronic control part controls the closing, opening and firing of the working head 4 is known in the art and will not be described in detail herein, in this embodiment, the electronic control part includes a sensing device 5, and the sensing device 5 and the trigger applying member 133 form a recognition switch. In a specific application, the sensing device 5 and the trigger applying member 133 may be products commonly used in the prior art, for example, the sensing device 5 is a reflective photoelectric switch, the trigger applying member 133 is a reflective member for triggering the reflective photoelectric switch, or the sensing device is a hall switch, and the trigger applying member is a magnet for triggering the hall switch. In this embodiment, the sensing device 5 is arranged on the lower jaw arm 443, and the sensing device 5 is embedded in the lower jaw arm 443 in order to make the structure of the stapler more compact. The lower jaw arm 443 is provided with a sliding groove 446 extending along the staple discharging direction of the staples, when the cartridge assembly 20 is mounted on the working head 4, the clamping block 135 is positioned in the sliding groove 446, and the clamping block 135 can move along the staple discharging direction and direction of the staples in the sliding groove 446.

A first positioning block 61 and a second positioning block 62 are arranged between the front jaw arm 441 and the tissue contact platform; when the surgical instrument is closed, the first and second positioning blocks 61, 62 are clamped between the front jaw arm 441 and the tissue contacting deck of the cartridge body 11, respectively; in the height direction of the anvil 46, the first positioning block 61 and the second positioning block 62 are located at two sides of the contact area of the stitching nail; the anvil 46, staple contact area, first positioning block 61, and second positioning block 62 are enclosed to form a parallelogram frame. In this embodiment, in order to make the staples have a standard B-shape, the frame formed by surrounding the anvil 46, the staple contact area, the first positioning block 61, and the second positioning block 62 is rectangular. In this embodiment, the first positioning block 61 and the second positioning block 62 are specifically clamped between the anvil 46 and the tissue contacting platform, and the thickness of the first positioning block 61 is equal to the thickness of the second positioning block 62. In this embodiment, the first positioning block 61 is disposed on the cartridge assembly 20 above the staple contact zone. The first positioning block 61 is specifically formed by protruding from the tissue contacting surface, and in other embodiments, the first positioning block 61 may be disposed on the anvil 46 or the front jaw arm 441, but if the first positioning block 61 is disposed on the anvil 46 or the front jaw arm 441, the first positioning block 61 may damage the sutured and cut tissue after the working head 4 is inserted into the sutured and cut tissue. In this embodiment, the second positioning block 62 is disposed on the anvil bracket 44, however, in other embodiments, the second positioning block 62 may be disposed directly on the anvil 46 or the cartridge assembly 20, and if the second positioning block 62 is disposed on the anvil 46, the stapled and cut tissue may be damaged; if the second positioning block 62 is disposed on the staple cartridge assembly 20, the structural design is relatively complex, and the original staple cartridge assembly 20 is greatly modified, which is time-consuming and increases the cost. In the present embodiment, the second positioning block 62 is specifically disposed in the lower jaw arm 443, the second positioning block 62 is disposed in the sliding groove 446 and slides in the sliding groove 446, and the second positioning block 62 is moved in a direction in which the second positioning block 62 pushes the anvil 46 through the cartridge assembly 20. In the staple discharging direction, the second positioning block 62 is located at the front side of the clamping block 135. A first spring 63 is further disposed in the sliding groove 446, and the first spring 63 is compressed or expanded along the sliding direction of the second positioning block 62; when the pushing force exerted by the cartridge assembly 20 on the second positioning block 62 is removed, the first spring 63 pushes the second positioning block 62 away from the anvil 46; a stopper 64 for restricting the second positioning block 62 from moving in the reverse direction of the staple discharging direction is provided in the chute 446. The limiting block 64 is disposed opposite to the first spring 63 at two sides of the second positioning block 62. The lower jaw arm 443 is provided with a groove 447, the stopper 64 is disposed in the groove 447 and can move in the groove 447, and the groove 447 is provided with a second spring 65 therein for driving the stopper 64 to move upward in the groove 447. The second spring 65 is configured to, when the fixture block 135 interferes with the stopper 64, cancel the force applied by the fixture block 135 to the stopper 64, and then the second spring 65 pushes the stopper 64 back to the original position again. The second positioning block 62 includes a clamping portion 621 clamped between the tissue contact platform and the anvil 46, and an extension arm 622 extending rearward from the clamping portion 621, and an end of the extension arm 622 is connected to the first spring 63.

Referring to fig. 1 and fig. 4 to 6, the above-mentioned anastomat works in the following manner: when the cartridge module 20 needs to be mounted on the working head 4, the visual observation window 118 can be used for checking whether the nail pushing plate 13 can be seen, if not, the cartridge module 20 can be judged to be unfired (as a new cartridge module), otherwise, the cartridge module 20 can be unfired (as an old cartridge module), and the mounting and use can be avoided. After the nail bin assembly 20 is mounted on the working head 4, the sensing device 5 senses the trigger applying piece 133, if the sensing device 5 senses the trigger applying piece 133, the nail bin assembly 20 is further confirmed to be unfired, at the moment, the electric control part makes ready for closing and firing the nail anastomat, and if the sensing device 5 does not sense the trigger applying piece 133, the electric control part is closed. After the cartridge module 20 is mounted on the working head 4, the nail protection plate 2 of the cartridge module 20 needs to be removed first. After the nail guard 2 is removed, the working head 4 of the surgical instrument is inserted into the tissue to be sutured and cut so that the sutured and cut tissue is positioned in the U-shaped jaw cavity 445, then the electric control part starts a closing procedure, and controls the battery power supply to drive the transmission assembly 45 to drive the closing rod 42 and the firing rod 43 to move towards the direction of the nail anvil 46 (the direction is the same as the nail discharging direction of the staples), and because the nail cartridge assembly 20 is fixed on the closing rod 42 and the firing rod 43, at the moment, the closing rod 42 and the firing rod 43 push the nail cartridge assembly 20 to move together towards the direction of the nail anvil 46 until the tissue contact platform and the nail anvil 46 clamp the sutured and cut tissue; when the cartridge assembly 20 cannot move towards the anvil 46 any more, the closing rod 42 stops moving, the electric control part starts the firing program, the firing rod 43 is controlled to still move towards the anvil 46, the firing rod 43 pushes the cutting assembly 14 in the cartridge assembly 20 to move towards the anvil 46 continuously, the cutting assembly 14 pushes the nail pushing plate 13 to move towards the anvil 46 in the moving process, at this time, the nail pushing plate 13 moves from the first position towards the second position, the trigger applying member 133 is misplaced with the sensing device 5, the sensing device 5 cannot sense the trigger applying member 133, and at the same time, the nail pushing plate 13 gradually disappears from the visual observation window 118, the ejector pin piece 131 of the ejector pin plate 13 enters the stitching pin cavity to gradually push out stitching pins in the stitching pin cavity from the stitching pin cavity, the stitching pins move towards the direction of the stitching anvil 46, the stitching pins are driven into the stitched and cut tissues so as to achieve stitching, and when stitching is completed, the blade 142 cuts the stitched tissues. When the stitching and cutting is completed, the ejector pin plate 13 is moved to the second position, and the positioning clamping blocks 137 on the ejector pin plate 13 enter the guard plate clamping grooves 1121 to realize clamping. When the suturing and cutting is completed, the electric control part starts a reset program, the excitation rod is controlled to be pulled back first, the cutting assembly 14 fixedly connected with the excitation rod is driven to be pulled back when the excitation rod is pulled back, and when the excitation rod is pulled back to the same position as the closing rod 42, the excitation rod and the closing rod 42 are pulled back simultaneously, and the closing rod 42 drives the whole nail bin assembly 20 to be pulled back to the original position. After the cartridge module 20 returns to its original position, the sensing device 5 will still not sense the trigger applying member 133 and the ejector plate 13 will not be exposed in the visual inspection window 118 because the positioning block 137 is in clamping engagement with the retainer plate slot 1121 and the ejector plate 13 remains in the second position. The cartridge assembly 20 and surgical instrument can be used to identify whether the cartridge assembly 20 is fired in two ways: 1. control program implements identification of cartridge assembly 20 (which may be referred to as electronic fool proofing): the nail bin assembly 20 and the surgical instrument are provided with the trigger applying piece 133 on the nail pushing plate 13, and the gun body 10 matched with the trigger applying piece 133 is provided with the sensing device 5 forming a recognition switch with the trigger applying piece 133, so that whether the nail bin assembly 20 is fired or not is recognized by sensing the position of the trigger applying piece 133 through the sensing device 5; 2. identification of cartridge assembly 20 is accomplished by visual inspection of the mechanical structure transformations: the cartridge module 20 and the surgical instrument determine whether the ejector plate 13 is fired by determining whether the ejector plate 13 is exposed by the visual observation window 118 by providing the cartridge body 11 with the visual observation window 118 for displaying the position of the ejector plate 13. Because the nail bin assembly 20 and the surgical instrument can identify the nail bin assembly 20 in a multiple mode through a control program and a visual observation mechanical mechanism, the accuracy of identifying the nail bin assembly 20 is improved, double insurance is realized, and medical accidents are avoided.

What should be stated here is also: when the cartridge assembly 20 is moved toward the anvil 46 by the pushing of the closure bar 42, the tissue contacting deck will contact the second positioning block 62 and push the second positioning block 62 toward the anvil 46, the first spring 63 being compressed; when the second positioning block 62 contacts the anvil 46, the first positioning block 61 also contacts the anvil 46, so that the two forces applied to the anvil 46 by the cartridge assembly 20 are the same, the same clamping thickness of the stapled and cut tissue (the cartridge assembly 20 is parallel to the anvil 46) is ensured, and the problem that the formed staples are formed into staple heads and dovetails can be avoided, thereby improving the stapling effect. After stapling and cutting are completed, the cartridge assembly 20 is retracted, at which time the force on the second positioning block 62 is removed and the second positioning block 62 is reset under the action of the first spring 63 to meet the next closure and firing. When the closing lever 42 pushes the cartridge assembly 20 to move toward the anvil 46, the driving lever 421 on the closing lever 42 simultaneously pushes the upper tissue positioning needle 12 to move toward the anvil 46 until the upper tissue positioning needle 12 is inserted into the upper tissue positioning hole 444, and the lower tissue positioning needle 47 is passively inserted into the cartridge body 11 during the movement of the cartridge assembly 20 toward the anvil 46, thereby positioning the stapled and cut tissue in the staple jaw cavity 445 in an up-down position for facilitating the subsequent stapling and cutting. By using the upper and lower tissue positioning needles 12 and 47, the tissue to be sutured and cut is ensured to be completely anastomosed, and leakage is prevented.

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. A surgical instrument for stapling and cutting tissue, the surgical instrument comprising a gun body and a staple cartridge assembly arranged on the gun body, wherein an electric control part is arranged in the gun body, the gun body comprises a closing rod, a firing rod, a staple anvil bracket and a staple anvil, the staple anvil bracket comprises a front jaw arm in a cantilever state, the staple anvil is fixed on the front jaw arm, the staple cartridge assembly is connected with the firing rod and the closing rod, the staple cartridge assembly comprises a cartridge body, staples arranged in the cartridge body, a staple pushing plate used for pushing the staples out of the cartridge body and a cutting assembly capable of moving relative to the cartridge body, the cartridge body is provided with a tissue contact platform, the staple anvil faces the tissue contact platform, and the staple anvil is provided with a staple contact area contacted with the staples; when the surgical instrument is closed, the first positioning block and the second positioning block are respectively clamped between the nail anvil bracket and the tissue contact platform of the nail bin; in the height direction of the nail anvil, the first positioning block and the second positioning block are positioned at two sides of the stitching nail contact area; the nail anvil, the stitching nail contact area, the first positioning block and the second positioning block are arranged in a surrounding mode to form a parallelogram frame, a trigger piece is arranged on the nail pushing plate, and the electric control part comprises an induction device which is arranged on the nail anvil bracket and forms an identification switch with the trigger piece;

The nail anvil bracket further comprises a rear jaw arm and a lower jaw arm, wherein a U-shaped jaw cavity is formed by surrounding the front jaw arm, the rear jaw arm and the lower jaw arm, a chute extending along the nail outlet direction of the nail is formed in the lower jaw arm, the second positioning block is arranged in the chute and slides in the chute, a first spring is further arranged in the chute, and the first spring is compressed or expanded along the sliding direction of the second positioning block; when the pushing force exerted on the second positioning block by the nail bin assembly is removed, the first spring pushes the second positioning block to be away from the nail anvil.

2. The surgical instrument of claim 1, wherein the cartridge body defines a plurality of staple cavities for receiving staples therein, the staple pusher plate includes a plurality of staple pusher plates disposed in correspondence with the staple cavities for pushing the staples out of the staple cavities, a securing portion for securing the plurality of staple pusher plates, and a latch block formed to protrude downward from a lower surface of the securing portion, the trigger member being embedded in the latch block.

3. The surgical instrument of claim 1, wherein the cartridge body defines a visual viewing window for displaying the position of the ejector plate; when the cartridge assembly is unfired, a portion of the ejector plate is exposed by the visual viewing window, and when the ejector plate ejects the staples from within the stapling cavity, the ejector plate is remote from the visual viewing window.

4. The surgical instrument of claim 2, wherein the cartridge body further comprises two extension shields extending rearward from the staple mounting portion and disposed opposite each other, the ejector plate being disposed between the two extension shields, the extension shields and ejector plate being preceded by a snap-in structure for limiting movement of the securing portion relative to the cartridge body.

5. The surgical instrument of claim 4, wherein the fastening structure comprises a shield clip slot formed in the extension shield and a detent clip formed in the securing portion; when the staple pushing plate pushes out the staples from the staple cavities, the positioning clamping blocks are clamped in the guard plate clamping grooves.

6. The surgical instrument of claim 1, wherein the cutting assembly has a mounting cavity formed therein, the firing bar is inserted into the mounting cavity, the mounting cavity has a side wall having a relief slot formed therein, the firing bar has a mating end inserted into the mounting cavity and a longitudinal portion extending rearward from the mating end and passing through the relief slot, the mating end has a tab formed thereon, and the side wall limits the tab from exiting the mounting cavity in a direction opposite the staple exiting direction.

7. The surgical instrument of claim 1, wherein the anvil, staple contact area, first positioning block, second positioning block are enclosed to form a square frame.

8. The surgical instrument of claim 1, wherein the first locating block has a thickness equal to a thickness of the second locating block.

9. The surgical instrument of claim 1 wherein said cartridge assembly is provided with an upper tissue positioning needle movable in a stapling direction relative to said cartridge assembly and insertable into said anvil, said anvil bracket being provided with a lower tissue positioning needle insertable into said cartridge assembly, said upper and lower tissue positioning needles being located on opposite sides of said staple contact zone in a longitudinal direction of the anvil.