CN108113723B

CN108113723B - Surgical instrument

Info

Publication number: CN108113723B
Application number: CN201711398171.4A
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: 2024-02-13
Anticipated expiration: 2037-12-21
Also published as: CN108113723A

Abstract

The utility model relates to a surgical instrument for suturing and cutting tissues, which comprises a gun body and a nail bin assembly arranged on the gun body, wherein the gun body comprises a closing rod, a firing rod, a nail anvil bracket and a nail anvil, the nail bin assembly is connected with the firing rod and the closing rod and comprises a bin body, a nail pushing plate arranged in the bin body, a cutting assembly capable of pushing the nail out of the bin body and moving relative to the bin body, the cutting assembly pushes the nail pushing plate to enable the nail to be moved out of the bin body, the firing rod is provided with a front end face which pushes the cutting assembly, and the front end face is arc-shaped or conical. The surgical instrument can improve the stapling effect of staples, and the front end surface is arranged into an arc shape or a conical shape, so that the anvil bracket can be designed without pre-bending, and the design and the manufacture of the surgical instrument are simpler.

Description

Surgical instrument

Technical Field

The present utility model 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. In order to solve the problem that the upper and lower nails are inconsistent due to large nail forming force of the linear anastomat, the jaw is pre-bent to ensure the upper and lower consistency of the nails, but the mode puts high requirements on the design and the preparation of the linear anastomat, and in actual use, even if the jaw is pre-bent, the problem of forming nails still exists.

Disclosure of Invention

The utility model aims to provide a surgical instrument which can improve the stapling effect of staples.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a surgical instrument for stitch and cut tissue, surgical instrument includes the rifle body and sets up nail storehouse subassembly on the rifle body, the rifle body includes closure bar, firing bar, nail anvil support and nail anvil, nail storehouse subassembly is connected with firing bar, closure bar, nail storehouse subassembly includes the storehouse body, installs the internal staple of storehouse, and be used for with the staple follow the ejector pin board of the internal ejecting of storehouse and can be relative the cutting assembly of storehouse body motion, cutting assembly pushes against the ejector pin board causes the staple is removed from the storehouse body, the firing bar has to push against cutting assembly's preceding terminal surface, preceding terminal surface is arc or toper.

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 second wall, an avoidance groove is formed in the second wall, the firing bar is provided with an insertion end inserted into the installation cavity and a longitudinal portion extending backwards from the insertion end to form and penetrate through the avoidance groove, a protruding block is arranged on the insertion end, and the second wall limits the protruding block to be separated from the installation cavity in the opposite direction of the staple discharging direction.

Further, in the installation direction of the nail bin assembly, an insertion port for inserting the insertion end into the installation cavity is formed in one side of the installation cavity.

Further, the mounting cavity is provided with a top wall, the top wall is located above the mounting cavity in the mounting direction of the nail bin assembly, a clamping hook groove is formed by surrounding the top wall and the second wall, and a clamping block part inserted into the clamping hook groove is formed on the inserting end.

Further, 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 anvil is provided with a suture nail contact area which is in contact with the suture 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 front jaw arm and a tissue contact platform of the nail bin assembly; 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.

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.

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

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

Further, the first positioning block is arranged on the nail bin assembly, and the second positioning block is arranged on the nail anvil or the nail anvil bracket.

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 assembly is removed, the first spring pushes the second positioning block to be away from the nail anvil.

The utility model has the beneficial effects that: according to the surgical instrument disclosed by the utility model, the front end surface of the firing bar is arranged in an arc shape or a cone shape, so that the angle of the nail pushing sheet can be adjusted during firing, the consistency of the nail pushing sheet and the nail anvil is ensured, the surgical instrument can also adapt to different tissue thicknesses, the angle adjustment is completed according to the different tissue thicknesses, in addition, the upper and lower forces of the nail anvil bracket can be compensated, in conclusion, the nail forming effect of a stitching nail can be improved through the surgical instrument disclosed by the utility model, and the nail anvil bracket can be designed without prebending after the front end surface is arranged in the arc shape or the cone shape, so that the design and the manufacture of the surgical instrument are simpler.

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 utility model;

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;

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 utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

Referring to fig. 1, a surgical instrument according to an embodiment of the present utility model 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, 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 includes a staple mounting portion 111, two extension shields 112 extending rearward from the staple mounting portion 111 (in a direction opposite to a staple discharging direction) and disposed opposite to each other, an upper positioning needle mounting portion 113 extending rearward from a top of the staple mounting portion 111, and a pressing block 117 extending downward from a lower side of the staple mounting portion 111. The shield plate 2 serves to shield the tissue contacting platform. The upper positioning needle mounting portion 113 is located above the two extending guard plates 112, and the two extending guard plates 112 are engaged and perpendicular to the positioning needle mounting portion 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 moving direction of the ejector plate 13 is restricted because the fixing portion 132 is inserted into the second channel 116. When the anastomat is triggered, the knife rest 41 abuts against the fixing part 132. 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 the blade 142 passes through the second knife slot 134 before entering the first knife slot before cutting the tissue. 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. In the staple discharging direction, the pressing block 117 is located at the front side of the clamping block 135.

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 grasping the cartridge assembly 20. 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 a U-shaped jaw cavity 445 is formed around the front jaw arm 441, the rear jaw arm 442, and the lower jaw arm 443, the firing bar 43 and the closing bar 42 extend into the U-shaped jaw cavity 445 from the rear of the rear jaw arm 442, and the cartridge assembly 20 is disposed in 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, in order to describe 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 that the cartridge assembly 20 is in an unfired state, fig. 9 is that 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 along 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 the staples are ejected, due to the difference in pressure applied by each staple, the opposite staples will generate a pushing force to the push plate 131, and after the pushing force is applied to the push plate 131, the pushing force is transferred to the cutting assembly 14, and as the front end surface of the pushing rod 43 is in an arc shape, the cutting assembly 14 can move along the arc direction thereof under the pushing force, and when the cutting assembly 14 moves relative to the firing bar 43, the cutting assembly 14 will drive the push plate 13 to move from the first state 100 to the second state, and the opposite staples will swing from the first state position 131 to the second state 100. 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 end surface may be tapered, but, in contrast to an arc shape, the taper is prone to rigid impact, and the taper has a pointed portion, which is prone to damage to the cutting assembly 14, and in combination, the stapling effect of the staples may be improved by the surgical instrument, and the anvil holder may not be pre-bent after the front end surface is configured to be curved or tapered, thereby making the design and fabrication of the surgical instrument simpler.

The closure bar 42 is provided with a circular recess (not numbered) which mates with a circular boss 114 on the extension shield 112. The anvil 46 is fixed on the front jaw arm 441, the anvil 46 faces the cartridge assembly 20, the anvil 46 is opposite to the tissue contacting platform of the cartridge assembly 20, the anvil 46 has a staple contacting area (not numbered) which contacts with staples in the cartridge assembly 20 to apply pressure to the staples to bend the staples and form a B shape, the front jaw arm 441 is provided with an upper tissue positioning hole 444, 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, the closing lever 42 is provided with a deflector 421 which is abutted against the rear side of the upper tissue positioning needle 12, and when the closing lever 42 drives the cartridge 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 direction of the upper tissue positioning hole 444 until being inserted into the upper tissue positioning hole 44, thereby positioning the stapled and the cut tissue can be positioned 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 bracket of 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. A sliding groove 446 extending along the staple discharging direction of the staples is formed in the lower jaw arm 443, when the staple cartridge assembly 20 is mounted on the working head 4, the clamping block 135 and the pressing block 117 are located in the sliding groove 446, the clamping block 135 and the pressing block 117 can move along the staple discharging direction and the staple discharging direction in the sliding groove 446, and a stop step 447 is arranged on one side of the sliding groove 446. The stop step 447 is located on the front side of the abutment block 117 in the staple ejection direction to limit the forward movement of the abutment block 117.

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 staple protecting plate 2 is removed, the working head 4 of the surgical instrument is inserted into the tissue to be stapled and cut so that the stapled and cut tissue is positioned in the U-shaped jaw cavity 445, then the electronic control part starts a closing procedure, 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 staple anvil 46 (the direction is the same as the staple discharging direction of the staples), because the staple 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 staple cartridge assembly 20 together towards the direction of the staple anvil 46 until the tissue contact platform and the staple anvil 46 clamp the stapled and cut tissue, at the moment, the pressing block 117 and the stopping block 447 mutually abut against each other, the stopping block 447 limits the pressing block 117 to move forwards again, the staple cartridge assembly 20 cannot move towards the direction of the staple anvil 46 any more, so that the tissue contact platform and the nail anvil 46 can not excessively squeeze clamped and cut tissues, when the nail bin assembly 20 can not move towards the direction of the nail 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 direction of the nail anvil 46, the firing rod 43 pushes the cutting assembly 14 in the nail bin assembly 20 to continuously move towards the direction of the nail anvil 46, the cutting assembly 14 pushes the nail pushing plate 13 to move towards the direction of the nail anvil 46 in the moving process, at the moment, the nail pushing plate 13 moves from the first position towards the second position, the trigger applying part 133 is misplaced with the sensing device 5, the sensing device 5 can not sense the trigger applying part 133, at the same time, the nail pushing plate 13 gradually disappears from the visual observation window 118, the nail pushing plate 131 of the nail pushing plate 13 enters into the nail cavity to gradually push out the nail in the nail cavity from the nail cavity, the staples are moved in the direction of anvil 46 and the staples are driven into the tissue being stapled and severed to effect stapling, and upon completion of stapling, blade 142 severs the stapled tissue. 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, controls the firing bar 43 to retract first, drives the cutting assembly 14 fixedly connected with the firing bar 43 to retract when the firing bar 43 is retracted, and simultaneously retracts the firing bar 43 and the closing bar 42 back when the firing bar 43 is retracted to the same position as the closing bar 42, and the closing bar 42 drives the whole staple cartridge assembly 20 to retract 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 closing rod 42 pushes the cartridge assembly 20 to move towards the anvil 46, the deflector rod 421 on the closing rod 42 simultaneously pushes the upper tissue positioning needle 12 to move towards 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 process of moving the cartridge assembly 20 towards the anvil 46, so that the sutured and cut tissue in the U-shaped forceps cavity 445 is positioned at the upper and lower positions, and the sutured and cut tissue is positioned through the lower tissue positioning needle 47 and the upper tissue positioning hole 444, so that the subsequent suturing and cutting are facilitated.

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 utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. 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 utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model 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 nail cartridge assembly arranged on the gun body, the gun body comprising a closing rod, a firing rod, a nail anvil bracket and a nail anvil, the nail cartridge assembly being connected with the firing rod and the closing rod, the nail cartridge assembly comprising a cartridge body, a nail pushing plate arranged in the cartridge body, a cutting assembly capable of pushing the nail out of the cartridge body and moving relative to the cartridge body, the cutting assembly pushing the nail pushing plate to move the nail out of the cartridge body, the surgical instrument being characterized in that the firing rod is provided with a front end surface pushing the cutting assembly, the front end surface being outwards protruding arc-shaped or conical; the front end face is abutted against the nail pushing piece, and the nail pushing piece can swing along an arc-shaped or conical direction relative to the front end face.

2. 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 second 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 second wall limits the tab from exiting the mounting cavity in a direction opposite the staple exiting direction.

3. The surgical instrument of claim 2, wherein one side of the mounting cavity is provided with an insertion port for insertion of the insertion end into the mounting cavity in a mounting direction of the cartridge assembly.

4. The surgical instrument of claim 2, wherein the mounting cavity has a top wall, the top wall being positioned above the mounting cavity in a mounting direction of the cartridge assembly, the top wall and the second wall being defined with a hook slot, the insertion end having a clip portion formed thereon for insertion into the hook slot.

5. The surgical instrument of claim 1, wherein the anvil bracket includes a cantilevered front jaw arm, the anvil being secured to the front jaw arm, the anvil having a staple contact area in contact with the staples, a first positioning block and a second positioning block being disposed 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 front jaw arm and a tissue contact platform of the nail bin assembly; 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.

6. The surgical instrument of claim 5 wherein said cartridge assembly is provided with upper tissue positioning pins movable in a stapling direction relative to said cartridge assembly and insertable into said anvil, said anvil bracket being provided with lower tissue positioning pins insertable into said cartridge assembly, said upper and lower tissue positioning pins being located on opposite sides of said staple contact zone in a longitudinal direction of the anvil.

7. The surgical instrument of claim 5, wherein the anvil, staple contact area, first positioning block, second positioning block are enclosed to form a rectangular frame.

8. The surgical instrument of claim 5, wherein the first locating block has a thickness equal to a thickness of the second locating block.

9. The surgical instrument of claim 5, wherein the first positioning block is disposed on the cartridge assembly and the second positioning block is disposed on the anvil or anvil bracket.

10. The surgical instrument of claim 9, wherein the anvil bracket further comprises a rear jaw arm and a lower jaw arm, wherein the front jaw arm, the rear jaw arm and the lower jaw arm are enclosed to form a U-shaped jaw cavity, a chute extending along the staple discharging direction of the staples 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.