End effector and medical device

Abstract

The present invention relates to an end effector and a medical device for firing staples into a formed state. The staple has a staple body and staple legs provided at both ends of the staple body. It is characterized in that it includes a staple cartridge assembly for accommodating the staple and an anvil assembly docked with the staple cartridge assembly. The staple cartridge assembly has a staple cartridge opening oppositely arranged with the anvil assembly, and the anvil assembly is provided with a staple pit docked with the staple cartridge opening. During firing, the staple pit abuts against the staple leg to cause it to deflect and bend relative to the staple body to form a staple. After forming the staple, the projection of the staple leg on the anvil assembly falls into the staple cartridge opening. This end effector and medical device can cause the staple legs of the staple to be misaligned to form a staple, and ensure that the staple legs of each formed staple are fully bent, resulting in more reliable suturing and better anastomosis effect.

Description

Technical Field

[0001] The present invention relates to an end effector and a medical device, belonging to the field of medical surgical equipment. Background Art

[0002] A stapler is a device used in medicine to replace traditional manual suturing. Its main working principle is to use titanium staples to anastomose tissues, similar to a stapler. According to different application scopes, it can be mainly divided into skin staplers, gastrointestinal tubular staplers, rectal staplers, etc.; on the other hand, according to different functional shapes of the stapler, it can also be divided into linear cutting staplers and circular cutting staplers, etc.

[0003] Among many staplers, tubular staplers and linear staplers are commonly used suturing devices. When operating this type of stapler, staples are loaded in the staple cartridge holes, and the firing component at the back of the instrument is used to push the staples to the corresponding staple pits on the anvil, so that the two ends of the anastomosis needle bend inward under the action of force, thereby enabling the tissue to be sutured.

[0004] However, in the existing staplers, after the staples are fired and formed, the staple legs are in the same plane as the staple body (as shown in Figure 1 ), or the staple legs are misaligned when forming the staple. However, in these two current methods, when the staple legs bend and reach the staple body or the staple cartridge surface, the staple shape cannot be further depressed, and the suturing effect on thin tissues is not good, which may cause problems such as bleeding. Summary of the Invention

[0005] The purpose of the present invention is to provide an end effector and a medical device, which can make the staple legs of the staples misaligned when forming the staple, and ensure that the staple legs of each formed staple are fully bent, so that the suturing is more reliable and the anastomosis effect is better.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An end effector for firing staples to form staples. The staples have a staple body and staple legs provided at both ends of the staple body. It is characterized in that it includes a staple cartridge assembly for accommodating the staples and an anvil assembly docked with the staple cartridge assembly. The staple cartridge assembly has a staple cartridge opening oppositely arranged with the anvil assembly, and the anvil assembly is provided with staple pits docked with the staple cartridge opening; when firing, the staple pits hold the staple legs to make them offset and bend to one side relative to the staple body to form staples; after forming the staples, the projection of the staple legs on the anvil assembly falls into the staple cartridge opening.

[0007] Further, the staple pits include a first concave pit and a second concave pit. When firing, the two staple legs of the staples are respectively held in the first concave pit and the second concave pit, and the first concave pit and the second concave pit respectively make the two staple legs of the staples bend towards the side direction of the staple body.

[0008] Further, the first pit and the second pit are respectively provided with opposite first and second bevel edges. When firing, the first pit and the second pit bend the two legs of the staple, and the two legs are respectively offset and bent into a staple along the first and second bevel edges relative to the staple body to one side.

[0009] Further, define the position where the staple leg exits from the first pit and / or the second pit as the staple exit opening, and the distance between the two staple exit openings of the same staple pit as the staple exit spacing; the staple exit spacing is greater than the diameter of the staple, and the sum of the staple exit spacing and the diameter of the staple is less than the width of the staple cartridge opening.

[0010] Further, the staple exit spacing is greater than the diameter of the staple.

[0011] Further, the staple cartridge assembly has a working surface, and the staple cartridge opening is arranged on the working surface. After forming the staple, the projection of the staple leg falls into the staple cartridge opening.

[0012] Further, at least two groups of the staple pits are provided on the anvil assembly, and corresponding groups of staple cartridge openings are provided on the working surface.

[0013] Further, the anvil assembly includes an anvil head and an anvil rod arranged on the anvil head; an annular elastic locking member is sleeved on the outer circumference of the anvil rod, a locking hole communicating with the insertion cavity is penetrated on the outer circumference of the anvil rod, a clamping block is arranged in the locking hole, one end of the clamping block is fixed or abutted on the elastic locking member, and the other end extends into the insertion cavity.

[0014] Further, the locking hole is frustum-shaped, the opening of the locking hole close to the insertion cavity is smaller than the opening close to the elastic locking member, the clamping block has a first end abutting against the inner wall of the locking member and a second end extending into the insertion cavity, and the cross-sectional area of the first end is larger than that of the second end.

[0015] Further, the elastic locking member has an opening.

[0016] Further, the number of the clamping blocks is one, and the position where the clamping block abuts against the elastic locking member is symmetrically arranged with respect to the axis direction of the opening of the elastic locking member.

[0017] Further, the clamping block is fixedly connected with the inner wall of the elastic locking member.

[0018] Further, the anvil rod includes an injection-molded rod body extending downward from the anvil head and a metal rod body with one end embedded in the injection-molded rod body. The metal rod body has a metal wire-tying portion for tying a suture during surgery. The anvil head and the injection-molded rod body are integrally injection-molded, and the metal wire-tying portion is close to the anvil head.

[0019] Further, an annular groove is concavely formed on the outer circumference of the puncture shaft, and the elastic locking member is disposed in the annular groove.

[0020] The present invention also provides a medical device, which includes a working head, a shaft assembly connecting the working head, and the end effector as described above. The end effector is connected to the shaft assembly, and a driving device for driving the shaft assembly to work is provided in the working head.

[0021] Further, a connecting mechanism is provided in the working head. The connecting mechanism includes a first docking portion, a second docking portion arranged in parallel with the first docking portion, and a switching member sleeved between the first docking portion and the second docking portion. One end of the switching member is meshed with the inside of the second docking portion, and the other end is docked with the first docking portion. The switching member can move relative to the first docking portion on the second docking portion so that the switching member is partially sleeved on the first docking portion or separated from the first docking portion.

[0022] Further, a docking cavity with a circular cross-section is formed in the switching member, and a plurality of docking blocks extending inward from the side wall of the docking cavity are formed. A docking groove is formed between adjacent two of the docking blocks. A plug-in member for being received in at least part of the docking groove is formed on the first docking portion. When the switching member is sleeved on the first docking portion, the plug-in member can be squeezed by the docking block to move radially toward the first docking portion.

[0023] Further, the medical device is a tubular stapler, and two or three groups of staple pits and staple cartridge openings distributed concentrically are respectively provided on the anvil assembly and the staple cartridge assembly.

[0024] Further, the medical device is a linear stapler, and four or six groups of staple pits and staple cartridge openings distributed linearly are respectively provided on the anvil assembly and the staple cartridge assembly.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: By providing staple pits, the legs of the staples of the end effector and the medical device of the present invention are misaligned to form staples, and the legs of the staples are abutted so that their projections fall into the staple cartridge openings, so as to ensure that the legs of each formed staple are fully bent, the suture is more reliable, and the anastomosis effect is better.

[0026] In addition, the anvil assembly provided by the present invention has a delicate structure, with sufficient space for clamping. When clamping the anvil, it will not affect the insertion or separation of the anvil and the puncture shaft. The elastic locking component is not easily deformed by external forces, which will not affect the surgical operation and ensures the efficient progress of the surgery. The anvil head, injection molded rod body and positioning ribs of the provided anvil assembly are integrally injection molded and have a metal wire tying ring, without the need to be prepared in two parts, and the manufacturing process is simple and the cost is low.

[0027] Meanwhile, the medical device of the present invention can be connected without obstacles through the provided connecting mechanism, and can smoothly and reliably connect the two docking parts in any state, without damaging the service life of the components, and can be well maintained in the corresponding position after connection. The structure of the switching part sleeved on the docking part is reasonable, and it can be reliably and firmly docked with the docking part and drive the docking part to rotate.

[0028] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines the accompanying drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 shows the forming situation of the staples of the stapler in the prior art;

[0030] Figures 2 to 5 is a schematic structural diagram of the anvil assembly shown in an embodiment of the present invention;

[0031] Figure 6A and Figure 6B is a schematic structural diagram of the staple pit in the anvil assembly shown in an embodiment of the present invention;

[0032] Figure 7 is a schematic structural diagram of the working surface in the cartridge assembly shown in an embodiment of the present invention;

[0033] Figure 8 is a schematic structural diagram of the cartridge opening shown in an embodiment of the present invention;

[0034] Figure 9 is a schematic structural diagram of the puncture shaft shown in another embodiment of the present invention;

[0035] Figure 10 is a partial schematic structural diagram of the circular stapler shown in another embodiment of the present invention;

[0036] Figure 11 is Figure 10 an enlarged structural diagram of the a area in;

[0037] Figure 12 is for Figure 11 the structural diagram of the connecting mechanism shown in;

[0038] Figure 13 For Figure 12 the structural schematic diagram of the switching member in

[0039] Figure 14 For Figure 12 the structural schematic diagram of the first docking portion in

[0040] Figure 15 For Figure 12 the structural schematic diagram of the second docking portion in Specific Embodiments

[0041] The following further describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0042] It should be noted that: the terms such as "upper", "lower", "left", "right", "inner", "outer", etc. of the present invention are only for explaining the present invention with reference to the accompanying drawings and are not restrictive terms.

[0043] Please refer to Figures 2 to 9 , the end effector shown in a preferred embodiment of the present invention includes a staple cartridge assembly 1 for accommodating staples and an anvil assembly 2 docked with the staple cartridge assembly 1. The staple cartridge assembly 1 has a staple cartridge opening 11 disposed opposite to the anvil assembly 2, and the anvil assembly 2 is provided with a staple pit 21 docked with the staple cartridge opening 11; during firing, the staple pit 21 abuts against the staple legs of the staple to cause them to deflect and bend to form a staple relative to the staple body to one side; after forming the staple, the projection of the staple legs on the anvil assembly 2 falls into the staple cartridge opening 11.

[0044] Specifically, in this embodiment, the end effector is annular and is used to be installed on a tubular stapler. The staple pit 21 includes a first pit 211 and a second pit 212. During firing, the two staple legs of the staple respectively abut against the first pit 211 and the second pit 212, and the first pit 211 and the second pit 212 respectively cause the two staple legs of the staple to bend towards the staple body. Moreover, the first pit 211 and the second pit 212 are respectively provided with opposite first inclined sides 213 and second inclined sides 214. During firing, the first pit 211 and the second pit 212 bend the two staple legs of the staple, and the two staple legs respectively deflect and bend to form a staple relative to the staple body along the first inclined side 213 and the second inclined side 214 to one side.

[0045] The stapler opening 11 of this embodiment is located on the working surface 10 of the stapler assembly 1. During the firing process, the staples are pushed out of the stapler opening 11. Preferably, the stapler body and the working surface 10 are located in the same plane. Of course, in other embodiments, the plane where the stapler body is located can be protruding or recessed from the working surface 10. The specific situation is related to the setting position of the staple pusher in the stapler. However, in order to facilitate the staple formation, the situation of this embodiment is preferred. The position where the staple leg is ejected from the first pit 211 and / or the second pit 212 is defined as the stapler opening 210, and the distance between the two stapler openings 210 of the same staple pit 21 is the stapler spacing L. In order to ensure that the staple leg of the staple is fully bent after the staple is formed, the stapler spacing L plus the diameter of the staple is smaller than the width W of the stapler opening 11. In addition, the stapler spacing L needs to be larger than the diameter of the staple to ensure that the staple can be fired from the staple pit 21. The above arrangement ensures that during the firing process, the staple legs are pressed into the staple opening 11 . Since the staple body and the working surface 10 are located in the same plane, the staple legs are fully bent when entering the staple opening 11 .

[0046] In another embodiment, those skilled in the art should know that the stapler pusher, the stapler pusher and the size of the titanium staples used in the end effector of the stapler need to be precisely designed. Considering that large-sized components may cause discomfort to the patient, the stapler foot after the staple is formed can only be located in the same plane as the stapler body, that is, the stapler foot, the stapler body and the working surface are in the same plane. This can ensure that the stapler has a good stapling effect and reduce the size of the device.

[0047] In this embodiment, the nail anvil assembly 2 includes a nail anvil head 22 and a nail anvil rod 23 arranged on the nail anvil head 22, and the nail anvil rod 23 includes an injection molded rod body 24 extending downward from the nail anvil head 1 and a metal rod body 25 with one end embedded in the injection molded rod body 24. The metal rod body 25 has a metal wire-binding portion 26 for tying wires during surgery, a metal clamping portion 27, a plurality of positioning ribs 28 between the metal wire-binding portion 26 and the metal clamping portion 27, an annular elastic locking member 231 sleeved on the outer circumference of the nail anvil rod 23, and an insertion cavity 29 formed in one end away from the nail anvil head 22 for plugging with the puncture shaft 3. The metal wire-binding portion 26, the positioning ribs 28, the metal clamping portion 27 and the elastic locking member 231 are sequentially arranged on the metal rod body 25.

[0048] The metal rod 25 protrudes outward to form a first ring 251 and a second ring 252. Specifically, the first ring 251 and the second ring 252 are formed by extending outward from the outer circumference of the metal rod 25, and the first ring 251 and the second ring 252 have the same diameter. The first ring 251, the second ring 252 and the metal rod 25 surround a metal wire-binding portion 26, and the metal wire-binding portion 26 is close to the anvil head 1.

[0049] The metal rod 25 is formed with a third circular ring 253 and a fourth circular ring 254 protruding outward. Specifically, the third circular ring 253 and the fourth circular ring 254 are formed by extending outward from the outer circumference of the metal rod 25, and the third circular ring 253 and the fourth circular ring 254 have the same diameter. The third circular ring 253, the fourth circular ring 254 and the metal rod 25 are surrounded to form a metal clamping portion 27. The metal clamping portion 27 is away from the nail anvil head 22 relative to the metal wire binding portion 26, and the metal clamping portion 24 is located outside the insertion cavity 29.

[0050] The metal rod 25 is provided with a plurality of openings 255, the openings 255 being located between the second circular ring 252 and the third circular ring 253, and the plurality of openings 255 can be arranged at equal intervals in the circumferential direction of the metal rod 25. The plurality of openings 255 are used for forming positioning ribs 28 when the injection molding liquid flows out from the plurality of openings 255. Specifically, the injection molding liquid flows outward from the injection molding rod 24 along the openings 255 and then extends along the longitudinal direction of the metal rod 25 to form a plurality of positioning ribs 28. The nail anvil head 22, the injection molding rod 24 and the positioning ribs 28 are integrally formed by injection molding. Each of the positioning ribs 28 includes a first end 281 and a second end 282 arranged and oppositely disposed along the longitudinal direction of the metal rod 25, the first end 281 being located on the outer circumferential surface of the metal rod 25 and extending to the bottom of the second circular ring 252, and the second end 231 being located on the outer circumferential surface of the metal rod 25 and extending to the top of the third circular ring 253. The diameter of the second circular ring 252 is larger than the diameter of the third circular ring 253. The outer diameter formed by the first end 281 is the same as the diameter of the second circular ring 252. The outer diameter formed by the second end 282 is the same as the diameter of the third circular ring 253. Therefore, the outer diameter formed by the first end 281 is larger than the outer diameter formed by the second end 282. This design is conducive to the smooth docking of the nail anvil assembly with other components. In this embodiment, the number of positioning ribs 28 is 6. In other embodiments, the number of positioning ribs can be set to 4-8.

[0051] The metal rod 25 is inserted into the anvil head 22. The metal rod 25 is provided with a plurality of injection holes 250 at a position where it contacts the anvil head 22. The plurality of injection holes 250 may be arranged at equal intervals in the circumferential direction of the metal rod 25. When the anvil assembly is prepared by injection molding, the injection liquid flows through the injection holes 250 to facilitate the formation of the injection molding rod 24.

[0052] An annular elastic locking member 231 is sleeved on the outer circumference of the anvil rod 23. The anvil rod 23 is penetrated with a locking hole 230 communicating with the insertion cavity 29. The locking hole 230 is frustum-shaped and the opening of the locking hole 230 near the insertion cavity 29 is smaller than the opening near the elastic locking member 231. A clamping block 232 is arranged in the locking hole 230. The clamping block 232 has a first end (not labeled) abutting against the inner wall of the elastic locking member 231 and a second end (not labeled) extending into the insertion cavity 29. The cross-sectional area of the first end is larger than that of the second end. The part of the locking hole 230 near the insertion cavity 29 interferes with the clamping block 232 to limit the clamping block 232 from completely falling into the insertion cavity 29. It should be noted that in this embodiment, the clamping block 232 can also be fixedly connected to the inner wall of the elastic locking member 231 to limit the clamping block 232 from completely falling into the insertion cavity 29.

[0053] In this embodiment, the number of the clamping blocks 232 is one. The elastic locking member 231 has an opening (not shown). The position where the clamping block 232 abuts against the elastic locking member 231 is symmetrically arranged with respect to the axis direction of the opening of the elastic locking member 231. It should be noted that in other embodiments, the number of the clamping blocks 232 can be multiple. The multiple clamping blocks 232 are arranged in the corresponding locking holes 230, and the positions where the clamping blocks 232 abut against the elastic locking member 231 are arranged at equal intervals with respect to the opening.

[0054] It should be noted that as Figure 5 shown in the second embodiment of the present invention, the part of the locking hole 2-2 of the anvil rod 2-1 near the insertion cavity 2-3 does not need to interfere with the clamping block 2-4 to limit the clamping block 2-4 from completely falling into the insertion cavity 2-3. The outer circumference of the anvil rod 2-1 is penetrated with a locking hole 2-2 communicating with the insertion cavity 2-3. A clamping block 2-4 is arranged in the locking hole 2-2. One end of the clamping block 2-4 is fixed on the elastic locking member 2-5, and the other end extends into the insertion cavity. Specifically, the locking hole 2-2 has a cylindrical structure. The clamping block 2-4 has a first end (not labeled) fixed on the inner wall of the locking member and a second end (not labeled) extending into the insertion cavity. The cross-sectional area of the first end is larger than that of the second end.

[0055] Please combine Figure 9, a circumferential groove 31 is concavely formed on the outer circumference of the puncture shaft 3. When the anvil assembly is connected to the puncture shaft 3 and the puncture shaft 3 enters the anvil rod 2, the puncture shaft 3 causes the block 232 to move out of the insertion cavity 29, driving the deformation of the elastic locking member 231. When the circumferential groove 31 moves to the position of the block 232, the elastic locking member 231 resumes deformation, driving the block 232 into the insertion cavity 29 and engaging with the circumferential groove 31, thus completing the connection between the anvil assembly and the puncture shaft 3. Conversely, the anvil assembly and the puncture shaft 3 can be easily separated.

[0056] In this embodiment, the number of groups of staple pits 21 and staple cartridge openings 11 is two, and the specific number of staple pits 21 and staple cartridge openings 11 in each group can be selected according to actual needs. The staple pits 21 and the staple cartridge openings 11 are concentrically distributed on the anvil assembly 2 and the staple cartridge assembly 1 respectively.

[0057] Please refer to Figures 10 to 15 , in another embodiment of the present invention, the end effector shown in the previous embodiment is applied to a tubular stapler. The tubular stapler includes a working head, a shaft assembly connected to the working head, and the end effector shown in the previous embodiment. The end effector is connected to the shaft assembly, and a driving device (not shown) for driving the shaft assembly to work is provided in the working head. It should be noted that in other embodiments, the end effector can also be applied to a linear stapler. When applied to a linear stapler, four or six groups of linearly distributed staple pits and staple cartridge openings are respectively provided on the anvil assembly and the staple cartridge assembly.

[0058] Specifically, in this embodiment, the medical device takes an electrically controlled circular stapler 10 as an example. The circular stapler 10 includes a housing 100, a power input device (not shown) for providing power, a staple cartridge assembly 101 provided on the housing 100, an anvil assembly 102 that cooperates with the staple cartridge assembly 101 to complete suturing, a closing drive assembly 103 and a firing drive assembly 104 connected to the staple cartridge assembly 101, and a connection mechanism 105 that connects the power input device to the closing drive assembly 103 and the firing drive assembly 104. The closing drive assembly 103 includes a closing shaft 1031 that drives the closing drive assembly 103. The firing drive assembly 104 includes a firing shaft 1041 that drives the firing drive assembly 104. The power input device includes a power input shaft 106 for delivering power, a first gear 1061 sleeved outside the power input shaft, and a second gear 1062 meshing with the first gear 1061. The power input shaft 106 drives the first gear 1061 to rotate, and the first gear 1061 drives the second gear 1062 to rotate in the opposite direction. This embodiment includes two sets of connection mechanisms 105. The first set of connection mechanism 1051 connects the gear shaft of the first gear 1061 of the power input shaft 106 (i.e., the power input shaft 106) to the firing shaft 1041, and the second set of connection mechanism 1052 connects the gear shaft of the second gear 1062 of the power input shaft 106 to the closing shaft 1031, so as to realize transmitting power to the closing drive assembly 103 or transmitting power to the firing drive assembly 104. The power input device is a motor. The firing shaft 1041 and the closing shaft 1031 are actuating drive shafts. Specifically, when the first set of connection mechanism 1051 connects the gear shaft of the first gear 1061 of the power input shaft 106 to the firing shaft 1041, the power input device drives the power input shaft 106 to rotate, and the power input shaft 106 simultaneously drives the firing shaft 1041 to move to realize the firing of the circular stapler 10. When the second set of connection mechanism 1052 connects the gear shaft of the second gear 1062 of the power input shaft 106 to the closing shaft 1031, since the first gear 1061 and the second gear 1062 are meshed, the rotation of the power input shaft 106 will drive the second gear 1062 to rotate, and then the gear shaft of the second gear 1062 drives the closing shaft 1031 to move, so as to realize the movement of the staple cartridge assembly 101 to close or open the circular stapler 10. It should be noted that the firing and movement of the staple cartridge assembly 101 of the circular stapler 10 will not occur simultaneously, that is, the first set of connection mechanism 1051 connecting the gear shaft of the first gear 1061 to the firing shaft 1041 and the second set of connection mechanism 1051 connecting the gear shaft of the second gear 1062 to the closing shaft 1031 will not be realized simultaneously.

[0059] Please refer to Figure 12, in the first set of connection mechanisms 1051 and the second set of connection mechanisms 1052 in the electric circular stapler 10 shown in an embodiment of the present invention, the structures are the same. Hereinafter, the second set of connection mechanisms 1052 (hereinafter referred to as the connection mechanism) will be described in detail. The connection mechanism 1052 includes a first docking portion 1, a second docking portion 2 disposed parallel to the first docking portion 1, and a switching member 3 sleeved between the first docking portion 1 and the second docking portion 2. One end of the switching member 3 is internally engaged with the second docking portion 2, and the other end is docked with the first docking portion 1. The switching member 3 can move relative to the first docking portion 1 on the second docking portion 2 so that a part of the switching member 3 is sleeved on the first docking portion 1 or separated from the first docking portion 1. It should be noted that the switching member 3, the first docking portion 1, and the second docking portion 2 are coaxial. In this embodiment, the first docking portion 1 of the second set of connection mechanisms 1052 is connected to the second gear 1062, and the second docking portion 2 is connected to the closing shaft 1031.

[0060] Please refer to Figure 13 , the switching member 3 is a hollow cylinder. A docking cavity 31 with a circular cross-section is formed inside the switching member 3, and a plurality of docking blocks 32 extending inward from the side wall of the docking cavity 31 are formed. A docking groove 33 is formed between adjacent two of the docking blocks 32. The docking blocks 32 are an odd number arranged at equal intervals. In this embodiment, the docking blocks 32 are 3 arranged at equal intervals. This setting is the best solution. At this time, the thickness of the docking blocks 32 is appropriate, the structure of the switching member 3 is reasonable, and the switching member 3 can reliably and firmly drive the first docking portion 1 to rotate after being sleeved and docked with the first docking portion 1.

[0061] Please refer to Figure 14 , the first docking portion 1 includes a second cylinder 11, a convex column 12 protruding axially outward from the front end face of the second cylinder 11, and a plug-in member 13 disposed on the second cylinder 11. In this embodiment, a through hole 14 is formed on the side wall of the second cylinder 11, and the through hole 14 penetrates the first docking portion 1 in the radial direction. The plug-in member 13 is generally in an isosceles trapezoid shape. The plug-in member 13 is inserted into the through hole 14, and the plug-in member 13 protrudes out of the through hole 14, that is, the width of the plug-in member 13 is greater than the depth of the through hole 14, and the depth of the through hole 14 is the diameter of the second cylinder 11. The plug-in member 13 can move in the through hole 14 in the radial direction of the second cylinder 11. In order to prevent the plug-in member 13 from falling off, a long hole 15 extending in the radial direction of the first docking portion 1 is formed on the plug-in member 13, and a limiting block 16 inserted into the long hole 15 is disposed in the through hole 14. In this embodiment, the limiting block 16 is a rod perpendicular to the through hole 14, and both ends of the rod are inserted into the second cylinder 11.

[0062] The plug-in member 13 can be received in a partial docking groove 33. When the switching member 3 is sleeved on the first docking portion 1, the plug-in member 13 can be squeezed by the docking block 32 to move radially towards the first docking portion 1. Specifically, when the switching member 3 cooperates with the first docking portion 1, both the upper and lower ends of the plug-in member 13 enter the docking groove 33, or one end of the plug-in member 13 enters the docking groove 33 and the other end touches the docking block 32. At this time, the plug-in member 13 is squeezed by the docking block 32 to move the plug-in member 13 radially along the first docking portion 1 towards the docking groove 33 where the plug-in member 13 is docked, so that the switching member 3 can be smoothly sleeved in the first docking portion 1. In order to make the cooperation between the plug-in member 13 and the switching member 3 tight, in this embodiment, the width of the plug-in member 13 is greater than the inner circle diameter formed by the plurality of docking blocks 32, and the distance from the point where the maximum displacement of the plug-in member 13 is located to the axis of the first docking portion 1 is less than the inner circle radius formed by the plurality of docking grooves 33. In this embodiment, a first guiding surface 131 facing the switching member 3 is formed on the plug-in member 13, and a second guiding surface 321 matching the first guiding surface is formed on the docking block 32. The cooperation between the first guiding surface 131 and the second guiding surface 321 facilitates the docking of the plug-in member 13 and the switching member 3. In other embodiments, only the first guiding surface 131 or the second guiding surface 321 may be provided.

[0063] The specific docking process is as follows: In this embodiment, since there are 3 docking blocks 32 arranged at equal intervals, when not docked, both ends of the plug-in member 13 protrude from the first docking portion 1. When the switching member 3 is moved towards the first docking portion 1 on the second docking portion 2, one end of the plug-in member 13 faces one of the docking grooves 33 (for the convenience of subsequent description, this end is called the first end), and the other end faces the docking block 32 (for the convenience of subsequent description, this end is called the second end). At this time, the first end will be received in the corresponding docking groove 33, and since the second end interferes with the docking block 32, when the switching member 3 is sleeved on the first docking portion 1, the docking block 32 generates a force on the second end, causing the plug-in member 13 to move towards the first end, and the second end moves into the long hole 15, thus completing the docking of the switching member 3 and the first docking portion 1. At this time, since the first end is received in the docking groove 33, the side wall of the first end interferes with the side wall of the docking block 32 adjacent to the docking groove 33 that receives it, realizing meshing. Therefore, when the first docking portion 1 rotates, it can drive the switching member 3 to rotate.

[0064] It should be noted that in this embodiment, the width of the docking groove 33 is adapted to the thickness of the plug-in member 13. Therefore, when the plug-in member 13 is inserted into the docking groove 33, the plug-in member 13 will not move relative to the docking groove 33 under the drive of the power input shaft 106. However, if the width of the docking groove 33 is greater than the thickness of the plug-in member 13, when the power input shaft 106 drives the second gear 1062 to rotate initially, the plug-in member 13 will move a certain distance within the docking groove 33, but it will not affect the cooperation between the first docking portion 1 and the switching member 3.

[0065] In addition to this embodiment, in other embodiments, the setting method of the plug-in member can also be as follows:

[0066] The first setting method: An opening for receiving the plug-in member may be provided on the side wall of the first docking portion. An elastic member for pushing the plug-in member outward from the first docking portion is provided in the opening. The elastic member can be a spring. One end of the spring is fixed on the plug-in member, and the other end is fixed on the side wall of the opening. In order to prevent the plug-in member from completely moving out of the opening, one end of the plug-in member can be hinged to the first docking portion, or the spring force can be set so that the force exerted on the plug-in member by the spring cannot push the plug-in member completely out of the opening. When the switching member is sleeved on the first docking portion, the plug-in member can be squeezed by the docking block, and the elastic member connected to the plug-in member contracts, so that the switching member can be sleeved on the first docking portion without obstruction. The number of the plug-in members can be one or more. The distance from each plug-in member to the center of the first docking portion is between the inner circle radius formed by the plurality of docking blocks and the inner circle radius formed by the plurality of docking grooves.

[0067] The second setting method: A spring piece is provided on the side wall of the first docking portion. One end of the spring piece is fixed on the side wall of the first docking portion, and the other end of the spring piece is bent, and the bending direction extends away from the switching member. When the switching member is sleeved on the first docking portion, the spring piece is flattened, so that the switching member can be sleeved on the first docking portion without obstruction. The number of the spring pieces can be set to one or more. The distance from the spring piece to the center of the first docking portion is between the inner circle radius formed by the plurality of docking blocks and the inner circle radius formed by the plurality of docking grooves.

[0068] In the above two setting methods, the arrangement of the docking block and the plug-in part can be the same as that of this embodiment; or, only one plug-in part is provided. If set in this way, since the plug-in part has an elastic part or is a spring piece itself, when the plug-in part is not squeezed by the docking block, it always protrudes from the second cylinder. Therefore, no matter what the docking position is between the first docking part and the switching part at the beginning, the plug-in part will eventually be received in one of the docking grooves; or more than two plug-in parts are provided. Similarly, since the plug-in part has an elastic part or is a spring piece itself, when the plug-in part is not squeezed by the docking block, it always protrudes from the second cylinder. Therefore, no matter what the docking position is between the first docking part and the switching part at the beginning, one of the plug-in parts will eventually be received in one of the docking grooves.

[0069] Please refer to Figure 13 and Figure 15 , in this embodiment, the docking cavity 31 extends along the axial direction of the switching part 3 and penetrates the switching part 3. The docking block 32 and the docking groove 33 extend from one end of the docking cavity 31 towards the first end and penetrate the docking cavity 31. The second docking part 2 includes a first cylinder 21, an engaging part 22 provided on the outer circumferential surface of the first cylinder 21, and a cylindrical hole 23 recessed from the front end surface of the first cylinder 21. The convex column 12 is inserted into the cylindrical hole 23, and there is a clearance fit between the convex column 12 and the cylindrical hole 23. The convex column 12 can rotate in the cylindrical hole 23. Through the cooperation of the convex column 12 and the cylindrical hole 23, the first docking part 1 is connected to the second docking part 2, which helps to make the axis of the first docking part 1 overlap with the axis of the second docking part 2 and helps the docking of the switching part 3 and the first docking part 1. In this embodiment, the engaging part 22 is formed by several convex strips 221 protruding radially outward from the outer circumference of the first cylinder 21. The number of the convex strips 221 is the same as the number of the docking blocks 32, both being 3. When the switching part 3 is internally engaged with the second docking part 2, each convex strip 221 is correspondingly inserted into one docking groove 33. Through this setting, the structure of the switching part 3 is simplified, the docking structures of the switching part 3 with the first docking part 1 and the second docking part 2 are the same, and it also helps to reduce the overall volume.

[0070] In summary: By providing nail pits, the end effector and medical device of the present invention misalign the nail feet of the anastomosis nails and hold the nail feet of the anastomosis nails so that their projections fall into the nail magazine opening, so as to ensure that the nail feet of each formed anastomosis nail are fully bent, the suture is more reliable, and the anastomosis effect is better.

[0071] In addition, the anvil assembly provided by the present invention has a delicate structure, with sufficient space for clamping. When clamping the anvil, it will not affect the insertion or separation of the anvil and the puncture shaft. The elastic locking component is not easily deformed by external forces, which will not affect the surgical operation, ensuring the efficient progress of the surgery. The anvil head, injection-molded rod body and positioning ribs of the provided anvil assembly are integrally injection-molded and have a metal wire tie ring, which does not need to be prepared in two parts, with a simple manufacturing process and low cost.

[0072] Meanwhile, the medical device of the present invention can be connected without obstacles through the provided connecting mechanism. It can smoothly and reliably connect two docking parts in any state, without damaging the service life of the components, and can be well maintained in the corresponding position after connection. The structure of the switching piece sleeved on the docking part is reasonable, which can be reliably and firmly docked with the docking part and drive the docking part to rotate.

[0073] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0074] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A medical device for firing and forming anastomosis staples, characterized in that, It includes a working head, a shaft assembly connecting the working head, and an end effector. The staple has a staple body and staple legs provided at both ends of the staple body. It is characterized in that it includes a cartridge assembly for accommodating the staple and an anvil assembly docked with the cartridge assembly. The cartridge assembly has a cartridge opening oppositely arranged with the anvil assembly, and the anvil assembly is provided with a staple pit docked with the cartridge opening. When firing, the staple pit abuts against the staple legs to cause them to deflect and bend to form a staple relative to the staple body. After forming the staple, the projection of the staple legs on the anvil assembly falls into the cartridge opening. The end effector connects the shaft assembly, and a driving device for driving the shaft assembly to work is provided in the working head. A connecting mechanism is provided in the working head. The connecting mechanism includes a first docking portion, a second docking portion arranged parallel to the first docking portion, and a switching member sleeved between the first docking portion and the second docking portion. One end of the switching member is meshed inside the second docking portion, and the other end is docked with the first docking portion. The switching member can move relative to the first docking portion on the second docking portion so that the switching member is partially sleeved on the first docking portion or separated from the first docking portion. Wherein, a docking cavity with a circular cross-section is formed in the switching member, and a plurality of docking blocks extending inwards from the side wall of the docking cavity are formed. A docking groove is formed between two adjacent docking blocks. An inserting member for accommodating in at least part of the docking groove is formed on the first docking portion. When the switching member is sleeved on the first docking portion, the inserting member can be squeezed by the docking blocks to move radially towards the first docking portion. A through hole for accommodating the inserting member is opened on the side wall of the first docking portion. The through hole penetrates the first docking portion radially, and the inserting member protrudes out of the through hole.

2. The medical device according to claim 1, characterized in that The staple pit includes a first pit and a second pit. When firing, the two staple legs of the staple respectively abut against the first pit and the second pit, and the first pit and the second pit respectively bend the two staple legs of the staple towards the side direction of the staple body.

3. The medical device according to claim 2, wherein, The first pit and the second pit are respectively provided with opposite first inclined sides and second inclined sides. When firing, the first pit and the second pit bend the two staple legs of the staple, and the two staple legs respectively deflect and bend to form a staple relative to the staple body along the first inclined side and the second inclined side.

4. The medical device according to claim 3, characterized in that, Define the position where the staple legs exit the first pit and / or the second pit as the staple exit opening, and the distance between the two staple exit openings of the same staple pit as the staple exit spacing. The staple exit spacing is greater than the diameter of the staple, and the sum of the staple exit spacing and the diameter of the staple is less than the width of the cartridge opening.

5. The medical device according to any one of claims 1 to 4, characterized in that, The cartridge assembly has a working surface, and the cartridge opening is arranged on the working surface. After forming the staple, the projection of the staple legs falls into the cartridge opening.

6. The medical device according to claim 1, characterized in that, The anvil assembly includes an anvil head and an anvil rod provided on the anvil head; an annular elastic locking member is sleeved on the outer circumference of the anvil rod, a locking hole communicating with the insertion cavity penetrates through the outer circumference of the anvil rod, a clamping block is arranged in the locking hole, one end of the clamping block is fixed or abutted on the elastic locking member, and the other end extends into the insertion cavity.

7. The medical device according to claim 6, wherein, The anvil rod includes an injection molded rod body extending downward from the anvil head and a metal rod body with one end embedded in the injection molded rod body. The metal rod body has a metal wire tying portion for tying a wire during surgery. The anvil head and the injection molded rod body are integrally injection molded, and the metal wire tying portion is close to the anvil head.

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