CN116919502A - End effector and open linear stapler with same - Google Patents

Abstract

An end effector, including a substantially U-shaped fixed jaw located on the distal side and a movable jaw that can move relative to the fixed jaw to clamp tissue between the two, the fixed jaw being in contact with the movable jaw The surface of the jaws opposite to the jaws includes a nail base, the movable jaws can accommodate the nail cartridge, the surface of the nail base opposite to the movable jaw defines a tissue joint surface, the tissue joint surface defines a longitudinal axis and is provided with two holes on both sides of the longitudinal axis. The first pair of staple-forming dimples and the second pair of staple-forming dimples, both of the first pair of staple-forming dimples and the second pair of staple-forming dimples are configured by two staple-forming dimples arranged along the longitudinal axis. The centrally symmetrical structure is formed, and the nail-forming dimples have an asymmetric shape; the corresponding nail-forming dimples in the first pair of peg-forming dimples and the second pair of peg-forming dimples have opposite shape orientations along the transverse direction perpendicular to the longitudinal axis. This end effector can ensure the lateral alignment of the nail cartridge and the nail seat during nail firing and provide a better sealing effect.

Description

End effector and open linear suturing device having the same

Technical field

The present invention relates to an open linear suture, and in particular to an end effector and an open linear suture having the end effector.

Background technique

A stapler is a medical device commonly used in surgical procedures in today's medical community. During a surgical procedure, the stapler can be clamped to one or more tissue layers of the patient, and the staples fired by the stapler seal the tissue layers near the staples together. A typical stapler includes an end effector that is insertable into a patient and positioned relative to the tissue to be sutured. The end effector includes a pair of cooperating elongated jaw members, one of the jaw members including a staple cartridge having at least two rows of staples received therein, and the other jaw member including a A nail seat having nail-forming dimples aligned with the rows of nails in the nail bin. Generally, the stapler may also include a push rod slidable relative to the jaw member to eject staples sequentially or simultaneously from the staple cartridge via a cam surface on a wedge-shaped slider on the push rod. The cam surface can actuate one or more staple drivers carried by the staple cartridge and associated with the staples to urge the staples against the staple seats and form rows of staples in the tissue clamped between the jaw members. The rows of staples may be arranged as linear rows and/or arcuate rows to suture the patient's tissue sequentially or simultaneously in a predetermined pattern. Staplers can be divided into intraluminal staplers and open staplers. The intraluminal stapler is suitable for minimally invasive surgeries, such as endoscopic or laparoscopic surgeries, so the size of its end effector is designed to be smaller. According to the above classification, the present invention relates to an open stapler with a linear arrangement of staple rows, that is, an open linear stapler.

However, during the firing of the existing open linear stapler, a lateral force is generated between the nail and the nail-shaped pit of the nail-butting seat. This lateral force easily generates torque on the nail-butting seat, causing the nail cartridge to be in contact with the nail-butting seat. Cannot be aligned horizontally. Two parallel and lengthwise stapling suture lines formed after suturing. Two gaps with different widths will be generated between the adjacent nails of the suture line, resulting in poor sealing after suturing, which may cause leakage of the patient's sealed tissue during the suturing process.

Therefore, in order to solve the above problems, a new type of open linear stapler is urgently needed. This stapler can balance the force of the nail base during the firing of the nail and avoid the generation of torque, so that the nail base and the nail cartridge can be horizontally aligned. alignment, and can prevent the risk of leakage of the sealed tissue.

Contents of the invention

The present invention provides an end effector and an open linear stapler for a surgical instrument. The specific contents are as follows:

According to one aspect of the present invention, an end effector is provided, including an end effector located distally, wherein: the end effector includes a substantially U-shaped fixed jaw located distally and can be positioned relative to the fixed jaw. A movable jaw that moves to clamp tissue between the two. The fixed jaw includes a nail abutment seat on a surface opposite to the movable jaw. The movable jaw can accommodate a nail cartridge, and the nail abutment seat is connected to the movable jaw. Opposite surfaces of the movable jaw define a tissue engaging surface that defines a longitudinal axis extending along the length of the staple seat and is provided with first staple forming recesses on either side of the longitudinal axis. and a second pair of nail-formed dimples, the first pair of nail-formed dimples and the second pair of nail-formed dimples both constructed as a centrally symmetrical structure consisting of two nail-formed dimples. Arranged along the longitudinal axis and formed, the nail-forming dimples have an asymmetric shape; wherein the first pair of tack-forming dimples and the second pair of tack-forming dimples are mirror symmetrical with respect to the longitudinal axis and offset along said longitudinal axis.

In another embodiment, the first pair of staple-forming dimples and the second pair of staple-forming dimples each include a plurality of groups arranged along the longitudinal axis.

In another embodiment, the first pair of staple-forming dimples and the second pair of staple-forming dimples at least partially overlap in a transverse direction perpendicular to the longitudinal axis.

In another embodiment, the staple-forming pocket has a straight edge formed in the tissue-engaging surface and a curved edge opposite the straight edge, the straight edge being parallel to the longitudinal axis, two The nail-forming dimples form the centrally symmetrical structure in such a way that the curved edges face each other.

In another embodiment, the straight edge has first and second opposite ends, and the distance between the straight edge and the curved edge is along a distance from the first end to the second end. direction gradually decreases.

In another embodiment, the staple-forming dimple has a bottom surface, a distance from the bottom surface to the tissue-engaging surface defines a depth of the tack-forming dimple along a path extending from the tack-forming dimple. The depth gradually decreases in the direction from the middle part of the nail-forming recess to the first end, and the depth gradually decreases in the direction from the middle part of the nail-forming recess to the second end.

In another embodiment, the staple-forming pocket includes first and second side walls extending between the tissue engaging surface and the floor, the first side wall forming the linear edge , the second side wall forms the curved edge, wherein at least one of the first side wall and the second side wall is configured to extend in a direction from the bottom surface to the tissue engaging surface. Lateral slope.

In another embodiment, said two tack-shaped dimples forming said centrally symmetrical structure at least partially overlap in a transverse direction perpendicular to said longitudinal axis.

In another embodiment, the movable jaw is provided with a tissue positioning pin, and the nail base of the fixed jaw is provided with a tissue positioning pin hole corresponding to the position of the tissue positioning needle. , the tissue positioning pinhole is positioned at the upper end of the nail base along the longitudinal axis, and is offset in a transverse direction perpendicular to the longitudinal axis.

In another embodiment, the tissue engaging surface (82) is provided with at least two rows of pairs of staple-forming dimples along a transverse direction perpendicular to the longitudinal axis, with two adjacent rows of pairs of staple-forming dimples. define and are separated by the longitudinal axis.

In another embodiment, the number of pairs of nail-forming dimples in the two rows on either side of the longitudinal axis is the same or different.

According to another aspect of the present invention, an open linear suturing device is also provided, the open linear suturing device including the end effector as described above.

The end effector and open linear stapler according to the present invention solve the aforementioned problems existing in the prior art, can ensure the transverse alignment of the nail cartridge and the nail base during nail firing, and can improve the sealing effect on the tissue. .

Description of the drawings

Figure 1 is a schematic diagram of an end effector of a conventional open linear suture device.

Figure 2 is a schematic diagram of the nail-butting seat of the end effector of the existing open linear suture device.

Figure 3 is a schematic diagram of the basic structure of the stapler according to the present invention.

4 is a schematic diagram of the fixed jaw of the end effector of the stapler according to the first embodiment of the present invention.

Figure 5 is a schematic diagram of an end effector of a stapler according to a second embodiment of the present invention.

Fig. 6 is a schematic view of the staple base of the stapler according to the third embodiment of the present invention.

7A-7C are schematic diagrams of a staple base of a suturing device according to another embodiment of the present invention.

8A is a schematic diagram of the arrangement of staple-forming pits in the prior art, and FIG. 8B is a schematic diagram of the arrangement of staple-forming pits of a stapler according to another embodiment of the present invention.

9A-9B are schematic views of the fixing jaw of a stapler according to another embodiment of the present invention.

10A-10B are schematic diagrams of a fixed jaw of a stapler according to another embodiment of the present invention.

Each reference number in the figure indicates respectively: 1-handle, 2-connecting rod, 3'/3-end effector, 4-firing trigger, 6-fixed jaw, 7-movable jaw, 8'/8 -Nail base, 81'/81-tissue positioning pinhole, 82-tissue joint surface, 83-first nail forming pit pair, 84-second nail forming pit pair, 85'/85-nail forming pits , 851-straight edge, 852-curved edge, 853-first end, 854-second end, 855-convex curve section, 856-concave curve section, 857-bottom, 858-first side wall, 859- Second side wall, 9-nail bin, 10'/10-tissue positioning pin, 11-internal nail seat splint, 12'/12-external nail seat splint, 121/122-bending part, F-lateral force , T-torque, C-center of symmetry.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings in the form of specific embodiments, but the present invention is not limited to these embodiments. The following description of certain examples of the invention should not be used to limit the scope of the invention. Other examples, features, aspects, embodiments and advantages of the invention will be apparent to those skilled in the art from the following description, which is set out by way of example, the best mode contemplated for carrying out the invention. As will be realized, the invention is capable of other different and obvious aspects, all without departing from the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive.

Additionally, it should be understood that any one or more of the teachings, expressions, embodiments, examples, etc. described herein may be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. described herein. Or a combination of more. Accordingly, the following teachings, expressions, embodiments, examples, etc. should not be considered in isolation from each other. Various suitable ways in which the teachings herein may be combined will be apparent to those of ordinary skill in the art in view of the teachings herein. Such modifications and variations are intended to be included within the scope of the claims.

For clarity of disclosure, the terms "proximal" and "distal" are defined herein with respect to a human or robotic operator of a surgical instrument. The term "proximal" refers to the location of elements of the surgical end effector 3 that are closer to the human or robotic operator of the surgical instrument and further away from the surgical instrument. The term "distal" refers to the location of elements closer to the surgical end effector 3 of the surgical instrument and further away from the human or robotic operator of the surgical instrument. It should also be understood that, for convenience and clarity, spatial terms such as "vertical", "horizontal", "lower", "upper", "front" and "rear" are used herein with reference to the drawings. However, surgical instruments are used in many orientations and positions and these terms are not limiting and/or absolute.

The open linear stapler according to the present invention is described in detail below with reference to Figures 3-6.

First, the basic structure of the suturing device of the present invention will be described with reference to FIG. 3 . The suturing device of the present invention mainly consists of a main body and a firing component. In order from proximal to distal, the main body includes a handle 1, a connecting rod 2, and an end effector 3. The firing component includes a firing trigger 4 and a push rod, wherein the push rod can be designed as a commonly used long push rod or as a short push rod. The end effector 3 is mainly composed of two jaw components: a roughly U-shaped fixed jaw 6 and a movable jaw 7 that can move relative to the fixed jaw. The fixed jaw 6 includes a nail base 8, and the movable jaw 7 The mouth 7 includes a nail bin 9. The movable jaw 7 is provided with a tissue positioning needle 10. The nail base 8 of the fixed jaw 6 is provided with a tissue positioning pin hole 81 corresponding to the position of the tissue positioning needle 10. The connecting rod 2 connects the handle 1 and the end effector 3. Although the present invention is described below based on an example in which the fixed jaw 6 is located on the distal side and the movable jaw 7 is located on the proximal side, those skilled in the art will understand that the present invention can also be applied when the fixed jaw 6 is located on the proximal side and the movable jaw 7 is located on the proximal side. The movable jaw 7 is located on the far side.

For the convenience of description, a three-dimensional coordinate system is shown in Figure 3. The X direction shown in the figure is called the horizontal direction, the Y direction is called the vertical direction, and the Z direction is called the transverse direction. This coordinate system and the above-mentioned three directions are also applicable to other drawings of the present invention.

First embodiment

A first embodiment of the present invention is described below. Fig. 4 is a schematic diagram of the generally U-shaped fixed jaw 6 of the end effector 3 of the stapler according to the first embodiment of the present invention. As shown in Figure 4, the fixed jaw 6 of the present invention includes a hook-shaped component, which is called a hook-shaped component because this component is formed along the bottom of the stapler body (i.e., the lower part in the Y direction in Figure 3). The left distal side extends to the farthest end of the end effector 3 in the horizontal direction, and then extends upward in the vertical direction, looking approximately hook-shaped. The hook-shaped member includes an inner nail seat splint 11 located in the middle and two outer nail seat splints 12 respectively located outside the inner nail seat splint 11 in the transverse direction. The material for manufacturing the inner nail seat splint 11 is preferably a plastic that is approved for medical devices, especially nylon, and more specifically, a medical material such as nylon 66. Of course, the material for manufacturing the internal nail seat splint 11 can also be metal approved for medical devices, such as medical stainless steel. The materials for manufacturing the nail-butting seat 8 and the external nail-holding seat splint 12 are metals approved for medical devices, preferably medical stainless steel.

At the proximal end of the fixed jaw 6, the nail-butting seat 8 is fixedly connected to the proximal surface of the distal end of the substantially U-shaped external nail-butting seat splint 12 by welding. Since a large amount of heat will be generated during welding, the nail seat 8 does not directly contact the inner nail seat splint 11, but there is a small gap between the nail seat 8 and the inner nail seat splint 11. During welding, The generated heat will not be directly transferred to the nail seat splint 11, and this tiny gap can be clearly seen in Figure 4.

The welding method between the nail base 8 and the outer nail base splint 12 is preferably laser welding. In addition, gas shielded welding or friction stir welding can also be selected.

Of course, in addition to the above-mentioned welding method, the fixed connection between the nail base 8 and the external nail base splint 12 can also be bonded. The adhesive material used for bonding must be approved for use in medical devices. agent material.

Moreover, from a shape point of view, the nail seat 8 is aligned with the inner nail seat splint 11 and the outer nail seat splint 12 in the transverse and vertical directions, that is, from both sides of the end effector 3 in the transverse direction. Viewed from the side and from the upper side to the lower side in the vertical direction, the surfaces formed by the nail seat 8, the inner nail seat splint 11 and the outer nail seat splint 12 are flat, not uneven. . With this arrangement, in Figure 4, when viewed along the horizontal direction from the firing direction, the hook-shaped member is hidden under the nail base 8 and cannot be seen.

For comparison, refer to the nail-butting seat 8' in the prior art shown in Figure 1, in which the nail-butting seat 8' is U-shaped and is set on the outside of the hook-shaped member. The U-shaped nail-butting seat 8' and The connection between the hook-shaped parts is fixed by rivets. In this connection method, the U-shaped nail base 8' and the hook-shaped member do not form a substantially rigid integrated component. Therefore, when the stapler is in use and the firing trigger (not shown) is triggered, The firing force is first transmitted from the nail base 8' to the rivet pin between the nail base 8' and the outer nail base splint 12', and then to the outer nail base splint 12'. In this process, on the one hand, the transmission process of firing force is longer.

In the nail-button seat 8 using the first embodiment of the present invention, since the nail-button seat 8 is directly welded to the two external nail-button seat splints 12, a substantially rigid connection is formed between the nail-button seat 8 and the hook-shaped member. Therefore, when the stapler is in use, after the firing trigger 4 is triggered, the firing force is directly transmitted from the nail base 8 to the external nail base splint 12 through the force of the push rod. The force transmission process Shorter. The external nail seat splint 12 with this structure of the present invention has a stronger load capacity.

Second embodiment

A second embodiment of the present invention is described below. Referring to Fig. 5, which is a schematic diagram of the end effector 3 of the suturing device according to the second embodiment of the present invention. It can be clearly seen from FIG. 5 that the outer surface of the outer nail seat splint 12 is designed with two bending portions. The bending portion causes the two outer nail seat splints 12 to bend toward each other to reduce the size of the two external nail seats. The distance between the nail seat splints 12. There is a vertically bent portion 121 near the distal end, and a horizontally bent portion 122 at the proximal end. Although not shown in the drawings, those skilled in the art will understand that the other external nail base splint 12 on the other side, which is not visible in FIG. 5 , has the same bending portion arrangement. Due to the arrangement of these two bending parts, the distance between the two external nail base splints 12 can be reduced, thereby reducing the overall size of the end effector 3 in the lateral direction, thereby achieving miniaturization of the stapler. Therefore, the suturing device according to the present invention can be easily inserted into some critical parts of the patient's body, such as the deep abdomen. Although the above description is based on a specific embodiment in which the external nail seat splint 12 has two bending parts, those skilled in the art will understand that the size of the end effector 3 can also be reduced by providing only one bending part. Purpose.

Third embodiment

A third embodiment of the present invention is described below. Refer to Figure 6, which is a schematic diagram of the staple base 8 of the stapler according to the third embodiment of the present invention. At the upper end of the nail base 8 along the vertical direction, a tissue positioning pin hole 81 is eccentrically provided in the transverse direction for cooperating with the tissue positioning needle 10 so that the movable jaw 7 and the fixed jaw 6 are positioned during suturing. , in other words, when performing suturing, the staple bin 9 and the staple base 8 are accurately positioned, thereby ensuring that the staples emitted from the staple cartridge 9 and the nail-shaped pits on the staple base 8 are aligned with each other.

In contrast to the third embodiment of the present invention, see Figures 1 and 2 showing the nail base 8' of the end effector 3' of the existing open linear suture device. Although the tissue positioning pinhole 81' is also provided At the upper end of the nail base 8' along the vertical direction, it is positioned at the center of the nail base' 8 in the transverse direction, so that the nail forming pit cannot be set at this position, and therefore it cannot be set accordingly. Corresponding staples, so that when suturing the patient's tissue, one staple is missing at this location. The inventor found in the experiment that during the suturing process, the patient's tissue is prone to leakage caused by loose suturing at the distal end of the nail base 8' and close to the tissue positioning needle 10'.

The present invention adopts an eccentric arrangement for the tissue positioning pinhole 81, so that an additional nail forming pit can be provided at the upper end of the nail base 8 in the vertical direction adjacent to the tissue positioning pinhole 81. Although only one more nail-forming pit is provided, the inventor found in experiments that compared with the above-mentioned prior art in which the tissue positioning pinhole 81 is centrally arranged, the present invention has an eccentrically arranged tissue positioning pinhole. The occurrence of lax suturing at the end of the 81 nail base 8 has been reduced by 20%-30%, resulting in a better suturing effect, such as better hemostasis.

In the case of the third embodiment of the present invention, since the tissue positioning pinhole 81 is eccentrically arranged on the nail base 8, and according to manufacturing requirements, the gap between the edge of the tissue positioning pinhole 81 and the edge of the nail base pit needs to be greater than 0.010 inches, the width of the nail seat is required to ensure that the distance between the edge of the tissue positioning pin hole 81 and the edge of the nail seat plate is sufficient. Then, if the U-shaped nail seat 8 in the prior art is set on the outside of the hook-shaped member In such a design, the fixed jaw 6 of the end effector 3 will become very thick in the transverse direction, which is not conducive to the insertion of the stapler into the patient's body. However, as described in the first embodiment of the present invention, the nail base 8 is used to be fixedly connected to the proximal end of the outer nail base splint 12 by welding, so the end effector 3 of the stapler is Dimensions are thinned in the transverse direction, for example, in this design, the thickness of the distal end of the abutment system is 0.251 inches.

In addition, in order to prevent the roughly U-shaped external nail-butting seat splint from hooking up with the tissue during operation, a coating can be coated on the outer surface of the generally U-shaped nail-butting seat, thereby improving the smoothness of the nail-holding seat.

Through the above description, those skilled in the art should have a clear understanding of the inventive concept and specific technical means of the present invention. According to the open linear suture device of the present invention, the lateral thickness of the hook-shaped component system is reduced, thereby making it easier to insert into the patient's body during surgery, and the manufacturing process of the nail base is simpler. During the firing process, the load-bearing capacity of the outer nail base splint is stronger. There is no gap between the nail base and the outer nail base splint. The nail base will not move relative to the external nail base splint during use. Furthermore, the additional spikes added next to the eccentrically placed dowel holes can reduce the risk of leakage of the tissue to be sealed around the dowel holes.

Those skilled in the art should understand that the above three embodiments of the present invention can be implemented independently of each other or in combination with each other.

In addition, the present invention also provides the following improved embodiments.

Referring to Figures 7A-7C, a nail-butting seat 8 in a first modified embodiment of the present invention is shown. The main part of the nail-resisting seat 8 is U-shaped. The surface of the nail-resisting seat is provided with nail-shaped pits. The top of the nail-resisting seat has a different shape from the main part. It is not U-shaped, but a straight plate. This can be It is clear from the picture. The purpose of this arrangement is to minimize the width of the chopping board, so only the main part of the nail base 8 is designed to be U-shaped. The upper end of the nail base 8 is a plate placed on the outer nail base splint 12, and the The plate protrudes from the outer nail seat splint 12 in the Z direction, that is, transversely, so that there is enough space to set the eccentric tissue positioning pinhole 81 on the plate. The nail base 8 according to this improved embodiment has a larger space for the eccentric pin hole 81, which facilitates processing. The outer nail base splint 12 wrapped by the nail base 8 can play a supporting role during use. The main body of the nail base 8 is designed to be U-shaped, which can provide good force-bearing performance for the nail base 8. The end plate of the nail base 8 can provide more space for the end of the nail base 8, which is particularly suitable for For setting the eccentric tissue positioning pinhole 81.

A second modified embodiment of the present invention will be described below with reference to FIGS. 8A-8B. This improved embodiment relates to the pattern arrangement of 3D nail forming pits on the nail base.

The existing 3D nail forming pits on the nail base are composed of two small pits 85', that is, each two small nail forming pits 85' form a large 3D nail forming pit pair. As shown in Figure 8A, two nail-forming pit pairs are arranged in the transverse direction (Z direction), and further arranged in multiple groups along the vertical direction (Y direction) in the manner shown in Figures 6 and 7A, forming Two roughly parallel staple suture lines. The two staple sutures are formed in exactly the same manner, except that the corresponding pairs of staple-forming dimples are vertically staggered. During firing, due to the shape of the dimple 85', the nail exerts a lateral force F perpendicular to the straight long side of the dimple 85'. The existing arrangement makes it impossible to balance the lateral forces F acting on the corresponding pairs of staple-forming dimples of the two staple sutures, thus creating a torque T. This torque T increases exponentially as the staple suture line extends in the vertical direction, so that the staple cartridge and the staple base cannot be laterally aligned during firing. In addition, since the two staple suture lines are staggered in the vertical direction, two gaps with different widths will be generated between the adjacent nail feet of the staple suture line, resulting in poor sealing and weakened leakage resistance after suturing.

The present invention provides an improved pattern arrangement of nail-forming dimples. It can be understood that, as shown in FIGS. 3 and 4 , the surface of the nail base 8 facing the movable jaw 7 is clamped on one or more tissue layers of the patient during suturing, so this surface defines the tissue joint surface 82 . Referring again to FIG. 8B , the tissue joint surface 82 defines a longitudinal axis AX extending along the length direction (that is, the vertical direction, or Y direction) of the nail seat 8 , and two nails are provided on both sides of the longitudinal axis AX. The formed dimples 85 constitute a first pair 83 and a second pair 84 of nail-formed dimples.

Nail-forming dimples 85 have an asymmetrical shape. Taking the first pair of nail-forming dimples 83 as an example, two identical nail-forming dimples 85 are arranged along the longitudinal axis AX and are centrally symmetrical with respect to the point C between them, and together constitute the first pair of nail-forming dimples. 83. The point C may also be referred to as the center of symmetry C of the first pair of nail-shaped dimples 83 . The arrangement of the second nail-forming dimple pair 84 is substantially the same as that of the first nail-forming dimple pair 83 . The difference is that they are arranged in a substantially mirror-symmetrical manner relative to the longitudinal axis AX, instead of as shown in FIG. 8A Shown is formed by copy and paste.

In the illustrated embodiment, staple-forming dimples 85 have a straight edge 851 formed on the tissue engaging surface 82 and an opposing curved edge 852 . This straight edge 851 is parallel to the longitudinal axis AX. The two nail-forming dimples 85 form a centrally symmetrical structure with curved edges 852 facing each other. The straight edge 851 of the staple-forming pocket 85 has opposing first and second ends 853, 854. Along the direction from the first end 853 to the second end 854, the distance between the straight edge 851 and the curved edge 852 gradually decreases. The center of symmetry C is farther from the first end 853 than from the second end 854 . In other words, the first end 853 faces the outside of the centrally symmetrical structure, while the second end 854 faces the inside of the centrally symmetrical structure.

Further, the curved edge 852 has a convex curve segment 855 and a concave curve segment 856. The convex curve segment 855 is closer to the first end 853 than the concave curve segment 856 is to the first end 853 . The change in the distance between the straight edge 851 and the curved edge 852 is formed by the convexity and concavity of the curve.

Nail-forming pocket 85 has a bottom surface 857 . The distance between the bottom surface 857 and the tissue engaging surface 82 defines the depth of the staple forming pocket 85 . Among them, along the longitudinal axis AX, the depth of the nail-forming recess 85 is greatest at the middle position, and along the direction from the middle to the first end 853 and along the direction from the middle to the second end 854, the depth of the nail-forming recess 85 is greatest. The depth gradually decreases. In addition, staple forming pocket 85 also includes first and second side walls 858 and 859 extending between bottom surface 857 and tissue engaging surface 82 . The first side wall 858 intersects with the tissue engaging surface 82 to form a straight edge 851 , and the second side wall 859 intersects with the tissue engaging surface 82 to form a curved edge 852 . Preferably, at least one of the first side wall 858 and the second side wall 859 is configured as a sloped side wall. Here, "inclined" means that the side wall gradually inclines outward along the direction from the bottom surface 857 to the tissue engaging surface 82 to form a flared structure.

Although FIG. 8B only shows a corresponding set of first nail-forming dimple pairs 83 and second nail-forming dimple pairs 84 . Those skilled in the art will appreciate that both the first pair of staple-forming dimples 83 and the second pair of staple-forming dimples 84 may be arranged in multiple groups along the longitudinal axis AX to form two generally parallel staple suture lines.

Preferably, the first pair of staple-forming dimples 83 and the second pair of staple-forming dimples 84 are arranged staggered along the longitudinal axis AX. Those skilled in the art will understand that the staggered arrangement should ensure that at least a portion of the corresponding nail-forming dimples 85 of the first nail-forming dimple pair 83 and the second nail-forming dimple pair 84 overlap in the transverse direction. . In this arrangement, the force generated on each element is balanced, thus providing a better stitching effect. In addition, the two nail-forming dimples 85 forming the first pair 83 and the second pair 84 of nail-forming dimples also at least partially overlap laterally. Among them, the suture staples can be made of titanium.

The above-mentioned improved pattern arrangement of the nail forming pits can also make the gap between the adjacent nail feet of the two nail suture lines formed after sewing have a uniform width, which is beneficial to maintaining good sealing.

In addition, although not shown in the drawings, those skilled in the art will understand that in some embodiments, more than two rows of pairs of nail-forming pits may be provided on the tissue engaging surface of the nail base along the transverse direction perpendicular to the longitudinal axis. , such as three or more rows. Wherein, a longitudinal axis is defined between every two rows of pairs of nail-forming dimples. That is, the tissue interface now defines more than one longitudinal axis. In addition, the number of nail-forming pit pairs in the two rows on both sides of the longitudinal axis may be the same or different (for example, one row may have an even number, the other row may have an odd number, etc.).

A third modified embodiment of the present invention is described below. As shown in FIGS. 9A and 9B , in this embodiment, the two outer nail seat splints 12 are not flat-shaped members, but are bent in horizontal cross-section. If measured in the Z direction, that is, in the transverse direction, the distance formed by the two external nail seat splints 12 is smaller at the proximal side, and the distance formed at the distal side is larger. The U-shaped nail seats 8 respectively cover the proximal ends of the two external nail seat splints 12, and the proximal surfaces of the two external nail seat splints 12 support the back of the nail seat 8, while the outer nail seats At the distal end of the splint 12, a plastic component is provided between the two outer nail-butting splints 12 to fill the gap between the two outer nail-butting splints 12. Laterally extending pins are used to secure the anvil 8 to the outer anvil clamp 12 . The thickness of the fixed jaw of the surgical stapler according to this embodiment is smaller, the width of the nail seat 8 is also smaller, and the curved shape of the external nail seat splint 12 can increase the overall rigidity of the nail seat system.

A fourth modified embodiment of the present invention is described below. As shown in FIGS. 10A and 10B , when viewed in horizontal cross-section, the main body of the nail-button seat 8 is U-shaped and covers the inner nail-button seat splint 11 . The inner nail-butting seat splint 11 is T-shaped, and is nested with the main body of the nail-butting seat 8 . Two outer nail-butting seat splints 12 cover both sides of the nail-butting seat 8 and the inner nail-butting seat splint 11 . The top end of the nail base 8 is plate-like and covers the outside of the external nail base splint 12 so that there is enough space to set the eccentric tissue positioning pinhole 81 on the top plate of the nail base 8 (see Figure 7A). As shown in Figure 10B, in the The difference provides the surgeon with the cutting site for the knife to cut tissue.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Without departing from the spirit of the present invention, those skilled in the technical field to which the present invention belongs may make various modifications, supplements or substitutions to the described specific embodiments, and all of these modifications, supplements or substitutions may fall within The scope of protection of the present invention is defined by the appended claims.

Claims (12)

1. An end effector for a surgical instrument, the end effector (3) comprising a fixed jaw (6) of substantially U-shape located distally and a movable jaw (7) movable relative to the fixed jaw (6) for clamping tissue therebetween, the fixed jaw (6) comprising, at a surface opposite the movable jaw (7), a staple abutment (8), the movable jaw (7) being configured to receive a staple cartridge (9),

the surface of the abutment (8) opposite the movable jaw (7) defines a tissue engagement surface (82), the tissue engagement surface (82) defining a longitudinal Axis (AX) extending in the longitudinal direction of the abutment (8) and being provided with a first pair of staple forming pockets (83) and a second pair of staple forming pockets (84) located on either side of the longitudinal Axis (AX), both the first pair of staple forming pockets (83) and the second pair of staple forming pockets (84) being configured as a central symmetrical structure formed by two staple forming pockets (85) arranged along the longitudinal Axis (AX), the staple forming pockets (85) having an asymmetric shape, wherein the first pair of staple forming pockets (83) and the second pair of staple forming pockets (84) are mirror symmetrical with respect to the longitudinal axis and are staggered along the longitudinal axis.

2. The end effector as set forth in claim 1, wherein the first pair of staple forming pockets (83) and the second pair of staple forming pockets (84) each include a plurality of sets arranged along the longitudinal Axis (AX).

3. The end effector as claimed in claim 1 or 2, characterized in that the first pair of staple forming pockets (83) and the second pair of staple forming pockets (84) at least partially overlap in a transverse direction perpendicular to the longitudinal axis.

4. The end effector as set forth in claim 1 wherein said staple forming pockets (85) have a straight edge (851) formed in said tissue engaging surface (82) and a curvilinear edge (852) opposite said straight edge (851), said straight edge (851) being parallel to said longitudinal axis, two staple forming pockets (85) forming said centrally symmetrical structure in a manner opposite said curvilinear edge (852).

5. The end effector as set forth in claim 4 wherein said straight edge (851) has opposite first (853) and second (854) ends, a distance between said straight edge (851) and said curved edge (852) tapering in a direction from said first end (853) to said second end (854).

6. The end effector as set forth in claim 5 wherein the staple forming pocket (85) has a bottom surface (857), a distance of the bottom surface (857) from the tissue engaging surface (82) defining a depth of the staple forming pocket (85) that tapers in a direction from a middle of the staple forming pocket (85) to the first end (853) and that tapers in a direction from the middle of the staple forming pocket (85) to the second end (854).

7. The end effector as set forth in claim 6 wherein the staple forming pocket (85) includes first and second side walls (858, 859) extending between the tissue engaging surface (82) and the bottom surface (857), the first side wall (858) forming the straight edge (851) and the second side wall (859) forming the curved edge (852), wherein at least one of the first and second side walls (858, 859) is configured to be inclined outwardly in a direction from the bottom surface (857) to the tissue engaging surface (82).

8. The end effector according to any one of claims 4 to 7, wherein the two staple forming pockets (85) forming the centrosymmetric structure at least partially overlap in a transverse direction perpendicular to the longitudinal axis.

9. The end effector as claimed in claim 1, wherein a tissue positioning needle (10) is provided on the movable jaw (7), a tissue positioning needle hole (81) corresponding to the position of the tissue positioning needle (10) is provided on the staple holder (8) of the fixed jaw (6), the tissue positioning needle hole (81) being positioned at an upper end of the staple holder (8) along the longitudinal axis and being offset in a lateral direction perpendicular to the longitudinal axis.

10. The end effector as set forth in claim 1 wherein said tissue-engaging surface (82) is provided with at least two rows of pairs of staple forming pockets along a transverse direction perpendicular to said longitudinal axis, adjacent two rows of said pairs of staple forming pockets defining said longitudinal axis therebetween and being separated by said longitudinal axis.

11. The end effector as claimed in claim 1 or 10, wherein the number of pairs of said staple forming pockets of two rows on either side of said longitudinal axis is the same or different.

12. An open linear stapler, characterized in that it comprises an end effector according to any one of claims 1 to 11.