Anastomat with pre-pressing function

Abstract

The anastomat with the pre-pressing function comprises an actuator, a pre-pressing assembly and a driving assembly, the actuator comprises a nail bin box and a nail anvil, the pre-pressing assembly is connected with the nail bin box, and the pre-pressing assembly is driven by the driving assembly to switch the opening and closing states of a jaw between the nail bin box and the nail anvil; the pre-pressing assembly is of a four-connecting-rod structure. The conversion efficiency of converting the driving force of the driving assembly into the clamping force of the jaw is improved, the conversion efficiency reaches the maximum before the jaw is completely closed, and the problems that an existing front pre-pressing ring is large in resistance in the advancing process, and the jaw cannot be in place are solved.

Description

Technical Field

[0001] The invention relates to an anastomosis device, and in particular to an anastomosis device with a pre-pressing function. Background Art

[0002] The stapler is a medical device that replaces manual suturing. The stapler is generally equipped with an actuator, a cutting knife and other structures. During the operation, the tissue to be stapled is clamped and bitten in the jaws of the actuator (including the staple cartridge assembly and the staple anvil assembly), and the handle of the instrument gun is pressed to drive the cutting knife to cut the tissue. At the same time, the staples set in the staple cartridge assembly are pushed out and formed to staple the tissue.

[0003] During use, the stapler jaws need a certain clamping force to clamp tissues, otherwise the tissues will slip and affect the quality of the anastomosis. In addition, this clamping force can produce a certain pre-compression effect on the tissues to be anastomosed, reduce the pressure between the cutting knife and the jaws, and then reduce the forward resistance of the cutting knife, ensuring the safety and effectiveness of the anastomosis process. As the jaw closing angle decreases, the reaction force of the tissue on the jaws gradually increases, and the resistance becomes more obvious.

[0004] The stapler disclosed in patent CN112617940A has a pre-compression function, but its pre-compression arch is achieved by tightening the jaw angle through the inner diameter of the front pre-compression ring. Fig.10 As shown, the driving force on the front pre-compression ring 103 is F0, and the clamping force on the nail magazine 101 to close to the nail anvil 102 is F=F0×sina, where a is the angle between the nail magazine 101 and the nail anvil 102. As the angle a decreases, the clamping force F value becomes smaller and smaller. In the process of tightening the jaws, the front pre-compression ring 103 is affected by the reaction force of the tightening of the jaws, and the dynamic friction between the front pre-compression ring 103 and the nail anvil 102 and the nail magazine 101 gradually increases, causing the front pre-compression ring 103 to encounter great resistance during the forward movement, which will cause the jaws to be unable to be pre-compressed in place.

[0005] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a pre-pressing structure with a large clamping force to solve the problem that when the jaws are tightened, the front pre-pressing ring encounters great resistance during the forward movement and the jaws cannot be pre-pressed into place.

[0007] To achieve the above-mentioned purpose, the present invention proposes a stapler with a pre-stressing function, comprising: an actuator, a pre-stressing assembly and a driving assembly, wherein the actuator comprises a stapler magazine and a staple anvil, the pre-stressing assembly is connected to the stapler magazine, and the pre-stressing assembly switches the opening and closing state of the jaws between the stapler magazine and the staple anvil under the driving action of the driving assembly; wherein the pre-stressing assembly is a four-bar structure.

[0008] Optionally, the pre-pressing assembly includes a movable rod, a pre-pressing actuator rod, a front pre-pressing ring and a fixed block;

[0009] The first end of the movable rod is rotatably connected to the nail magazine, and the second end of the movable rod is rotatably connected to the pre-pressing execution rod;

[0010] The pre-compression actuator rod is engaged and connected with the front pre-compression ring, and is also rotatably connected with the fixing block;

[0011] The front pre-compression ring is connected to the driving assembly and moves forward and backward under the action of the driving assembly;

[0012] When the front pre-compression ring moves forward under the action of the driving assembly, the pre-compression execution rod rotates counterclockwise around the fixed block, and drives the nail magazine to rotate counterclockwise through the movable rod.

[0013] Optionally, a pin is provided at the first end of the movable rod, and two first pin holes are provided on the side surface of the upper rear end of the nail magazine, the pin cooperates with the first pin holes, and the nail magazine is rotatably connected to the two movable rods through the two first pin holes.

[0014] Optionally, two first axial holes are provided on the side of the lower rear end of the nail magazine, and two oppositely arranged second axial holes are provided on the rear end of the anvil. A first rivet is passed through the second axial holes on the anvil and the first axial holes on the nail magazine, so that the nail magazine and the anvil are rotatably connected, and the nail magazine can rotate around the first rivet.

[0015] Optionally, the pre-stressing actuator rod includes a pushing block, an intermediate shaft and a rotating member;

[0016] The intermediate shaft is connected to the movable rod, and the movable rod can rotate around the intermediate shaft;

[0017] The first end of the pushing block is engaged and connected with the front pre-compression ring, and the second end of the pushing block is connected with the two intermediate shafts;

[0018] The first end of the rotating member is also connected to the intermediate shaft, and the second end of the rotating member is rotatably connected to the fixing hole.

[0019] Optionally, the first end of the pushing block has a square protrusion structure, and the second end of the pushing block has two opposite supporting components, and each of the supporting components is connected to one of the intermediate shafts.

[0020] Optionally, a second pin hole is formed at the second end of the movable rod; the intermediate shaft comprises two parts with different diameters, wherein the pushing block and the rotating member are connected to the part with a larger diameter of the intermediate shaft, and the second pin hole of the movable rod is connected to the part with a smaller diameter of the intermediate shaft.

[0021] Optionally, the front pre-compression ring is annular and is provided with a square groove, which matches the raised structure on the push block. The raised structure is inserted into the square groove, and when the front pre-compression ring moves forward and backward, it drives the push block to move forward and backward.

[0022] Optionally, a third axial hole is provided on the second end of each rotating member, the fixed block passes through the front pre-pressure ring, the front end of the fixed block is on the front side of the front pre-pressure ring, and the rear end of the fixed block is on the rear side of the front pre-pressure ring; a fourth axial hole is provided at the front end of the fixed block, and the fourth axial hole matches the third axial hole. The fixed block is connected and fixed to the rotating member by passing a second rivet through the third axial hole and the fourth axial hole, so that the rotating member can rotate around the second rivet.

[0023] Optionally, the stapler further comprises a firing assembly, which is connected to the pre-compression assembly. The firing assembly is driven by a motor or manually to provide power to the driving assembly to move the front pre-compression ring forward and backward.

[0024] Compared with the prior art, the technical solution of the present invention has at least the following advantages and beneficial effects:

[0025] The stapler provided by the present invention adopts a four-link structure as a pre-compression component, which can provide a large closing force, increase the conversion efficiency of the driving force of the driving component into the jaw clamping force, and the conversion efficiency reaches the maximum before the jaws are fully closed, thereby solving the problem that the current front pre-compression ring has large resistance during the forward movement and the jaws cannot be put into place. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a stapler provided by the present invention;

[0027] Figure 2 A schematic diagram of the connection between the pre-pressing assembly and the actuator provided by the present invention;

[0028] Figure 3 A schematic diagram of the movable rod provided by the present invention;

[0029] Figure 4 A schematic diagram of a nail magazine provided by the present invention;

[0030] Figure 5 A schematic diagram of a nail anvil provided by the present invention;

[0031] Figure 6 A schematic diagram of a pre-compression actuator rod provided by the present invention;

[0032] Figure 7 A schematic diagram of the front pre-compression ring provided by the present invention;

[0033] Figure 8 A schematic diagram of a fixing block provided by the present invention;

[0034] Fig. 9 A force analysis diagram of the nail magazine provided by the present invention;

[0035] Fig.10 It is a schematic diagram of the connection and force of the pre-stressing component and the actuator in the background technology.

[0036] Reference numerals:

[0037] 1-actuator; 2-preload assembly; 4-firing assembly; 5-center tube assembly; 6-steering mechanism; 7-first rivet; 8-second rivet; 11, 101-nail magazine; 12, 102-nail anvil; 21-movable rod; 22-preload actuator rod; 23, 103-front preload ring; 24-fixed block; 111-first pin hole; 112-first shaft hole; 211-second pin hole; 212-pin shaft; 121-second shaft hole; 221-pushing block; 222-intermediate shaft; 223-rotating member; 2211-support component; 224-third shaft hole; 231-square groove; 241-front end of fixed block; 242-fourth shaft hole; 243-rear end of fixed block DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention Figures 1 to 10 , the technical solutions, structural features, objectives achieved and effects in the embodiments of the present invention are described in detail.

[0039] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0040] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the present invention, "front and back" in terms of positional relationship refers to the distance relative to the operator, "front" refers to the direction away from the operator, and "back" refers to the direction close to the operator.

[0041] As described in the background technology, the pre-compression assembly in the existing stapler applies a clamping force to the stapler magazine through the front pre-compression ring. As the jaw closing angle decreases, the reaction force of the tissue on the jaw gradually increases, and the resistance becomes more obvious, which will cause the jaw to be unable to be pre-compressed into place. In order to solve this technical problem, the present invention proposes a stapler including a pre-compression assembly with a large closing force. The pre-compression assembly is a four-bar structure, which increases the conversion efficiency of the input force of the front pre-compression ring into the jaw clamping force.

[0042] The present invention will be explained in detail below with reference to the accompanying drawings and embodiments.

[0043] like Figure 1 As shown, the present invention discloses a stapler with a large closing force pre-stressing structure, comprising an actuator 1, a pre-stressing component 2, a driving component and a firing component 4. The firing component 4 serves as an input end for operations such as pre-stressing, cutting and anastomosis, and retraction, and transmits the action to the pre-stressing component 2, the driving component, the actuator 1, etc., to control their respective movements.

[0044] The actuator 1 includes a staple magazine 11 and a staple anvil 12. The pre-pressing component 2 is used to switch the opening or closing state of the jaws between the staple magazine 11 and the staple anvil 12 under the driving action of the driving component. After the actuator 1 reaches a suitable position, the jaws between the staple magazine 11 and the staple anvil 12 are closed to facilitate subsequent cutting and stapling operations.

[0045] like Figure 2 As shown, the preloading assembly 2 is a four-link structure, including a movable rod 21, a preloading actuator rod 22, a front preloading ring 23 and a fixed block 24. Figure 2 and Figure 3 As shown, the movable rod 21 is generally elliptical, with a first end (front end) connected to the nail magazine 11, and a second end (rear end) connected to the pre-pressing actuator rod 22. The first end of the movable rod 21 is provided with a pin shaft 212, and the second end is provided with a second pin hole 211. Figure 4As shown, two first pin holes 111 are provided on the side of the upper part of the rear end of the nail magazine 11, and the two first pin holes 111 are respectively arranged on the two sides of the nail magazine 11, or, according to the size of the nail magazine 11 and the pre-pressing assembly 2, the rear end of the nail magazine 11 can be provided with a structure protruding from the end surface, and the two first pin holes 111 are respectively arranged on the side of the structure protruding from the end surface, or, the rear end of the nail magazine 11 is provided with a structure recessed in the end surface, and the two first pin holes 111 are respectively arranged on the side wall of the non-recessed structure. The first pin hole 111 cooperates with the pin shaft 212 on the movable rod 21, and the nail magazine 11 is rotatably connected to the two movable rods 21 through the two first pin holes 111.

[0046] The side surface of the lower part of the rear end of the nail magazine 11 is provided with a first shaft hole 112, and two first shaft holes 112 are respectively provided on two sides of the nail magazine 11, and the nail magazine 11 is rotatably connected to the nail anvil 12 through the first shaft holes 112. Figure 5 As shown, the rear end of the anvil 12 is provided with two oppositely arranged protruding pieces, with a accommodating space between the two protruding pieces, and each protruding piece is provided with a second axial hole 121 matching the first axial hole 112. The first rivet 7 is passed through the second axial hole 121 on the anvil 12 and the first axial hole 112 on the nail magazine 11, so that the anvil 12 can be rotatably connected with the nail magazine 11, wherein the nail magazine 11 can rotate around the first rivet 7, thereby changing the opening and closing state of the jaws between the nail magazine 11 and the nail anvil 12.

[0047] The movable rod 21 is rotatably connected to the preload actuator rod 22 via the second pin hole 211 at the second end thereof. Figure 6 As shown, the pre-stressing actuator rod 22 includes a push block 221, an intermediate shaft 222 and a rotating member 223. The pre-stressing actuator rod 22 is generally a scissor-shaped structure. The first end (upper end) of the push block 221 has a square protrusion structure, and the second end (lower end) has two opposite support parts 2211. Each support part 2211 is connected to an intermediate shaft 222, and the axial direction of the intermediate shaft 222 is perpendicular to the length direction of the stapler. The intermediate shaft 222 is also connected to the first end (upper end) of the rotating member 223, and the two intermediate shafts 222 are respectively connected to a rotating member 223. A third shaft hole 224 is opened on the second end (lower end) of each rotating member 223, and the rotating member 223 is rotatably connected to the fixed block 24 through the third shaft hole 224, so that the intermediate shaft 222 and the push block 221 can rotate around the second end of the rotating member 223.

[0048] The movable rod 21 is connected to the intermediate shaft 222 of the preload actuator rod 22 and can rotate around the intermediate shaft 222. In this embodiment, the intermediate shaft 222 includes two parts with different diameters, wherein the push block 221 and the rotating member 223 are connected to the part with a larger diameter of the intermediate shaft 222, and the second pin hole 211 of the movable rod 21 is connected to the part with a smaller diameter of the intermediate shaft 222, so that the preload actuator rod 22 is connected to the two movable rods 21. When the rotating member 223 rotates around the third shaft hole 224, the front and rear positions of the intermediate shaft 222 change, thereby driving the movable rod 21 to move forward and backward, and then driving the nail magazine 11 to rotate around the first rivet 7.

[0049] It should be noted that the relative position relationship of “up and down” in this embodiment is limited to the situation where the nail magazine 11 is above the nail anvil 12 .

[0050] The preload actuator 22 is connected to the front preload ring 23 through the push block 221, and is connected to the fixed block 24 through the third shaft hole 224 on the rotating member 223. Figure 7 As shown, the front pre-compression ring 23 is annular and has a square groove 231 thereon. The square groove 231 matches the square protrusion structure on the push block 221. The push block 221 is inserted into the square groove 231, so that when the front pre-compression ring 23 moves forward and backward, the push block 221 moves forward and backward accordingly. The fixing block 24 passes through the front pre-compression ring 23, as shown in FIG. Figure 2 and Figure 8 As shown, the front end 241 of the fixed block 24 is at the front side of the front pre-compression ring 23, and the rear end 243 of the fixed block 24 is at the rear side of the front pre-compression ring 23. A fourth axial hole 242 is provided on the front end 241, and the fourth axial hole 242 matches the third axial hole 224 on the pre-compression actuator 22. The fixed block 24 is connected and fixed to the rotating member 223 of the pre-compression actuator 22 by passing the second rivet 8 through the two third axial holes 224 and the fourth axial hole 242, so that the rotating member 223 can rotate around the second rivet 8. The position of the fixed block 8 is fixed, for example, it is fixedly connected to the fixed assembly of the stapler by screws, so that the second end position of the rotating member 223 is fixed, and the rotating member 223 only generates a rotational motion, and does not generate a translational motion.

[0051] The front preloading ring 23 is movable and connected to the driving assembly, and moves forward and backward under the driving force provided by the driving assembly. When the front preloading ring 23 moves forward under the action of the driving assembly, the square groove 231 also moves forward, pushing the pushing block 221, so that the rotating member 223 rotates counterclockwise around the second rivet 8. Since the intermediate shaft 222 is connected to the rotating member 223, the intermediate shaft 222 also rotates counterclockwise, thereby driving the movable rod 21 to move forward, thereby driving the nail magazine 11 to rotate counterclockwise along the first rivet 7 through the pin 212, thereby achieving the closing of the jaws. Conversely, when the front preloading ring 23 moves backward under the action of the driving assembly, the square groove 231 moves backward, driving the pushing block 221, thereby causing the rotating member 223 to rotate clockwise around the second rivet 8, driving the movable rod 21 to move backward, thereby driving the nail magazine 11 to rotate clockwise along the first rivet 7 through the pin 212, thereby achieving the opening of the jaws.

[0052] In this embodiment, when the front pre-compression ring 23 moves forward under the action of the driving assembly, the force analysis of the staple cartridge 11 is as follows: Fig. 9 As shown, the forward thrust exerted by the front pre-compression ring 23 on the push block 221 is F0, and the forward force on the intermediate shaft 222 is F1. According to the moment balance principle, the moment balance formula at the second rivet 8 is F0×L3=F3×L4, where F3=F1×cosb, b is the angle between the tangent direction and the horizontal direction of the intermediate shaft 222, and because the moment balance formula at the first rivet 7 is F×L2=F1×L1, the clamping force on the nail magazine 11 is

[0053]

[0054] According to the above formula, it can be seen that as the angle a between the nail magazine 11 and the nail anvil 12 becomes smaller, the angle b gradually increases, and the size of F gradually increases, that is, the conversion efficiency of the force input by the front pre-compression ring 23 into the jaw clamping force gradually increases. When the angle b is close to 90°, the F value can reach infinity. Therefore, the pre-compression component of the present scheme increases the conversion efficiency of the driving force of the driving component into the jaw clamping force, and solves the problem that the current front pre-compression ring has large resistance during the forward movement and the jaw cannot be in place.

[0055] Furthermore, the stapler may further include a limiting component to fix the position of the front pre-compression ring 23, thereby limiting the angle between the staple cartridge 11 and the staple anvil 12 and limiting the deflection angle of the actuator 1. The limiting component may be disposed on the front pre-compression ring 23 or on the drive assembly. In this embodiment, the specific structure of the limiting component is not limited, and for example, a protrusion and a groove may be used, or any other positionable form may be used.

[0056] In this embodiment, the firing assembly 4 is driven by a motor, and the firing assembly 4 provides power to the driving assembly through electric drive, so that the front preload ring 23 is moved forward and backward. In other embodiments, the firing assembly 4 can also be manually driven, and power is provided to the driving assembly through manual operation, so that the front preload ring 23 is moved forward and backward. The specific structural form of the firing assembly 4 is not the focus of the present invention, so it will not be described in detail here.

[0057] The stapler may also include a central tube assembly 5, a steering mechanism 6, and a cutting knife assembly, etc. The steering mechanism 6 provides a steering force and applies it to the driving assembly. The driving assembly is connected to the steering mechanism 5 and is driven by the steering mechanism 6 to turn, and the turning may include rotation and deflection; the cutting knife assembly is used to cut tissue, is arranged in the driving assembly, and deflects with the deflection of the driving assembly. The structures such as the driving assembly, the central tube assembly 5, the steering mechanism 6, and the cutting knife assembly are conventional structural forms of the stapler, and are not described in detail in this embodiment.

[0058] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A stapler with a pre-compression function, characterized in that: include: An actuator, a pre-pressing assembly and a driving assembly, wherein the actuator includes a nail magazine and a nail anvil, the pre-pressing assembly is connected to the nail magazine, and the pre-pressing assembly switches the opening and closing state of the jaws between the nail magazine and the nail anvil under the driving action of the driving assembly; wherein the pre-pressing assembly is a four-bar structure.

2. The stapler according to claim 1, characterized in that: The preloading assembly includes a movable rod, a preloading actuator rod, a front preloading ring and a fixed block; The first end of the movable rod is rotatably connected to the nail magazine, and the second end of the movable rod is rotatably connected to the pre-pressing execution rod; The pre-compression actuator rod is engaged and connected with the front pre-compression ring, and is also rotatably connected with the fixing block; The front pre-compression ring is connected to the driving assembly and moves forward and backward under the action of the driving assembly; When the front pre-compression ring moves forward under the action of the driving assembly, the pre-compression execution rod rotates counterclockwise around the fixed block, and drives the nail magazine to rotate counterclockwise through the movable rod.

3. The stapler according to claim 2, characterized in that: A pin is provided at the first end of the movable rod, and two first pin holes are provided on the side surface of the upper rear end of the nail magazine. The pin cooperates with the first pin holes, and the nail magazine is rotatably connected to the two movable rods through the two first pin holes.

4. The stapler according to claim 2, characterized in that: Two first axial holes are provided on the side surface of the lower rear end of the nail magazine, and two second axial holes are provided on the rear end of the nail anvil, which are arranged opposite to each other. A first rivet is passed through the second axial holes on the nail anvil and the first axial holes on the nail magazine, so that the nail magazine and the nail anvil are rotatably connected, and the nail magazine can rotate around the first rivet.

5. The stapler according to claim 2, characterized in that: The pre-stressing actuator rod comprises a pushing block, an intermediate shaft and a rotating member; The intermediate shaft is connected to the movable rod, and the movable rod can rotate around the intermediate shaft; The first end of the pushing block is engaged and connected with the front pre-compression ring, and the second end of the pushing block is connected with the two intermediate shafts; The first end of the rotating member is also connected to the intermediate shaft, and the second end of the rotating member is rotatably connected to the fixing hole.

6. The stapler according to claim 5, characterized in that: The first end of the pushing block has a square protrusion structure, and the second end of the pushing block has two opposite supporting components, and each of the supporting components is connected to one of the intermediate shafts.

7. The stapler according to claim 5, characterized in that: The second end of the movable rod is provided with a second pin hole; the intermediate shaft comprises two parts with different diameters, wherein the pushing block and the rotating member are connected to the part with a larger diameter of the intermediate shaft, and the second pin hole of the movable rod is connected to the part with a smaller diameter of the intermediate shaft.

8. The stapler according to claim 6, characterized in that: The front pre-compression ring is annular and is provided with a square groove, which matches the protruding structure on the pushing block. The protruding structure is inserted into the square groove. When the front pre-compression ring moves forward and backward, it drives the pushing block to move forward and backward.

9. The stapler according to claim 5, characterized in that: A third axial hole is provided on the second end of each rotating member, the fixed block passes through the front pre-compression ring, the front end of the fixed block is on the front side of the front pre-compression ring, and the rear end of the fixed block is on the rear side of the front pre-compression ring; a fourth axial hole is provided at the front end of the fixed block, and the fourth axial hole matches the third axial hole. The fixed block is connected and fixed to the rotating member by passing a second rivet through the third axial hole and the fourth axial hole, so that the rotating member can rotate around the second rivet.

10. The stapler according to claim 2, characterized in that: The stapler also includes a firing assembly, which is connected to the pre-compression assembly. The firing assembly is driven by a motor or manually, and provides power to the driving assembly to move the front pre-compression ring forward and backward.

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