Surgical stitching instrument

Abstract

The utility model provides a surgical stapler which comprises an anvil portion, the anvil portion comprises a cap portion at one end of an anvil portion body, a retaining pin groove of the anvil portion deviates towards one side relative to a center line, and an extending portion section of the cap portion provides a part of a tissue contact surface of the anvil portion or is used for supporting a widened tissue contact surface. This arrangement allows as much as possible a certain error when firing the retaining pin, even if the retaining pin is not accurately received by the retaining pin recess, the end of the retaining pin abuts against the tissue contact surface of the anvil portion without miss the anvil portion into the tissue. The retaining pin abuts against the enlarged tissue contact surface, resisting actuation of the anvil portion and cartridge toward the closed configuration, which enables an operator to perceive anomalies in actuation of the guide pin. The retention pin abutting against the tissue contact surface of the anvil portion may return to the retention pin recess under subsequent slight shake or similar operations to allow subsequent surgical procedures.

Description

Technical Field

[0001] The utility model relates to the field of surgical instruments, in particular to a surgical stapler / anastomosis device. Background Art

[0002] Surgical staplers / staplers are commonly used to deploy nails into tissues to reduce or eliminate tissue bleeding, such as when tissues are cut, it is necessary to sew up the tissues to promote healing. Surgical staplers / staplers (such as linear staplers / staplers, arc-shaped staplers / staplers) may include an end effector assembly having a staple cartridge and a staple anvil portion, the end effector assembly being capable of fixing the tissue between the staple cartridge and the anvil portion, wherein the staple cartridge includes a staple cartridge configured to be able to removably store surgical staples therein, and the anvil portion includes a staple groove for forming the staples. Such surgical staplers / staplers typically include a closure system that moves one of the staple cartridge and the anvil portion relative to the other.

[0003] As described above, the surgical stapler / stapler can be configured to close the nail magazine and the anvil portion of the end effector assembly to form a closed configuration so that tissue is captured between the nail magazine and the anvil portion. In the closed configuration, the nail magazine and the anvil portion apply a clamping force to the tissue so that the tissue is kept between the anvil portion and the nail magazine. Then, the nail is driven to deform from the nail magazine and against the nail groove of the anvil portion, thereby fixing the tissue layers together. The nail is usually deployed with a number of nail lines or nail rows so that the tissue layers are more reliably fixed together. The end effector assembly may not include a cutting member or include a cutting member that can be advanced between the nail rows to cut the tissue after the tissue layers have been sutured together.

[0004] like Figure 1 The figure shows an existing end effector 16. The U-shaped distal support structure 48 defining the end effector 16 has a staple cartridge mounting portion 52 that removably receives a staple cartridge 160. The end effector 16 is also configured to be able to laterally receive or "reload" tissue within a gap defined between a cartridge housing 162 of a staple cartridge 160 mounted within the end effector 16 and an anvil 210. The end effector 16 also includes a retaining pin 176 that can extend distally from the staple cartridge 160 in the direction of the arrow in the figure for capturing tissue between the anvil 210 and the cartridge housing 162. The retaining pin may be, for example, Figure 1 As shown, the handle end of the surgical stapler is pushed, or the end actuator is pushed by the user, so that the retaining pin is received by the corresponding position of the anvil. However, the retaining pin is easy to deviate from the predetermined target. Once the retaining pin deviates, it will miss the anvil and hit the tissue around the anvil, which will not only fail to achieve the subsequent surgical purpose, but also may cause damage to the tissue.

[0005] Therefore, it is necessary to provide a surgical stapler to at least partially solve the above problems. Utility Model Content

[0006] The utility model provides a surgical stapler, wherein the anvil portion of the surgical stapler includes a cap portion having an extension section. The extension section of the cap portion can be used as an additional tissue contact surface or for supporting a widened tissue contact surface. Such an arrangement allows a certain error as much as possible when firing a retaining pin, for example, even if the retaining pin is not accurately received by a retaining pin groove, the end of the retaining pin will also abut against the tissue contact surface of the anvil portion, and will not miss the anvil portion and enter the tissue. The retaining pin abutting against the tissue contact surface of the anvil portion can return to the retaining pin groove under subsequent slight shaking or similar operations to allow subsequent surgical operations.

[0007] According to one aspect of the utility model, a surgical stapler is provided, the surgical stapler comprising a handle assembly for an operator to hold and an end actuator located at the distal end of the handle assembly in a first direction, the end actuator comprising an anvil portion and a staple cartridge, the anvil portion and the staple cartridge being configured to be movable relative to each other along the first direction between an open configuration and a closed configuration, the anvil portion being formed into a long strip extending along a second direction perpendicular to the first direction, wherein:

[0008] The surgical stapler is configured to fire the surgical staples in the staple cartridge toward the anvil portion;

[0009] The anvil portion has a proximal tissue contact surface formed with a staple groove for receiving and shaping the surgical staple and a retaining pin groove for receiving a retaining pin provided on the staple magazine, and the anvil portion includes an anvil portion body and a cap portion located at the end of the anvil portion body.

[0010] Wherein, the nail forming groove has a center line extending along the second direction, the retaining pin groove deviates to one side relative to the center line, and the cap portion has an extension section extending along the side wall of the anvil portion body on the one side of the anvil portion body.

[0011] In one embodiment, a dimension of the extension section of the cap portion in the second direction is greater than or equal to 5.3 mm.

[0012] In one embodiment, a dimension of the extension section of the cap portion in the second direction is 5.3 mm-5.9 mm.

[0013] In one embodiment, the maximum width of the tissue contacting surface is greater than or equal to 7.0 mm.

[0014] In one embodiment, the maximum width of the tissue contacting surface is 7.0 mm-8.0 mm.

[0015] In one embodiment, the cap portion includes a cap portion body located on one side of the anvil portion body in the second direction, the cap portion body having a width that tapers in a direction away from the nail forming groove, and the size of the cap portion body in the first direction also tapers in a direction away from the nail forming groove.

[0016] In one embodiment, the anvil portion includes a support member, which includes a support body installed in the anvil portion body and the cap portion exposed to the outside, wherein the support member is an elongated support structure made of plastic, and the anvil plate of the anvil portion is a plate-like structure made of stainless steel.

[0017] In one embodiment, a trigger for operably firing the surgical staple is disposed on the handle assembly, and a retaining pin operating component for operably firing the retaining pin is disposed on the end effector.

[0018] In one embodiment, a chamfer feature structure for guiding the retaining pin into the retaining pin groove is formed on the outer periphery of the retaining pin groove.

[0019] In one embodiment, the chamfer feature includes a continuous annular portion surrounding the retaining pin groove.

[0020] In one embodiment, the chamfer feature includes a rectangular portion disposed only on the one side of the retaining pin recess.

[0021] In one embodiment, the extension section and a surface of the anvil portion body facing the staple cartridge jointly constitute the tissue contact surface.

[0022] In one embodiment, the extension section and the anvil portion main body have the same size in the first direction, and respective surfaces of the extension section and the anvil portion main body facing the nail magazine are flush.

[0023] In one embodiment, the cap portion includes a cap portion body located on one side of the anvil portion body in the second direction, and the outer surface of the extension section that is approximately perpendicular to the third direction is formed as an arcuate surface that gradually approaches the side wall of the anvil portion body in a direction away from the cap portion body and terminates at the side wall of the anvil portion body.

[0024] In one embodiment, a surface of the extension section facing the nail cartridge is further away from the nail cartridge than a surface of the anvil portion body facing the nail cartridge.

[0025] In one embodiment, the extension section is a flat plate structure with uniform width.

[0026] In one embodiment, the anvil portion body includes an anvil plate having the staple groove, the anvil plate having a portion extending along a third direction to cover a surface of the extension section facing the staple cartridge, so that the tissue contact surface is completely defined by the anvil plate.

[0027] In one embodiment, the cap portion includes a cap portion body located on one side of the anvil portion body in the second direction, and the outer surface of the extension section that is approximately perpendicular to the third direction is formed as an arcuate surface that gradually approaches the side wall of the anvil portion body in a direction away from the cap portion body and terminates at the side wall of the anvil portion body.

[0028] In one embodiment, a surface of the cap body at a junction with the anvil plate that faces the nail cartridge is flush with a surface of the anvil plate that faces the nail cartridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention and its features and advantages will be better understood by referring to the following description of the exemplary embodiments of the present invention in conjunction with the accompanying drawings. In the following description and drawings, similar parts are marked with similar numbers. The drawings are not necessarily drawn to scale, and for the sake of clarity and brevity, some parts may be omitted, and some drawings may be drawn in an exaggerated or schematic manner.

[0030] Figure 1 An end effector of a conventional surgical stapler is shown;

[0031] Figure 2 A three-dimensional view of a surgical stapler according to an embodiment of the present invention is exemplarily shown;

[0032] Figure 3 for Figure 2 An enlarged view of the end effector portion in FIG.

[0033] Figure 4 for Figure 2 A side view of the anvil portion;

[0034] Figure 5 for Figure 4 A partial enlarged view of

[0035] Figure 6 A perspective view of an end effector of a surgical stapler according to another embodiment of the present invention;

[0036] Figure 7 for Figure 6 A partial enlarged view of

[0037] Figure 8 for Figure 6 A side view of the anvil portion;

[0038] Fig. 9 for Figure 8 A partial enlarged view of

[0039] Fig.10 is a perspective view of an end effector according to yet another embodiment of the present invention;

[0040] Fig.11 for Fig.10 A side view of an anvil portion;

[0041] Fig. 12A for Fig.11 A partial enlarged view of

[0042] Fig. 12B for Fig.11 A three-dimensional schematic diagram of a cutting board in FIG.

[0043] Figure 12C-12H for Fig. 12B Six views of the cutting board in Figure 1, where Fig. 12C is the front view of the anvil portion, Fig.12D is a back view of the anvil portion, Fig.12E It is the left side view of the anvil part. Fig.12F It is the right side view of the anvil part. Figure 12G is a top view of the anvil portion, Fig.12H It is a bottom view of the anvil portion. DETAILED DESCRIPTION

[0044] Below, the exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. What is described here is only an exemplary embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the exemplary embodiments, and the other ways also fall within the scope of the present invention.

[0045] Figure 2-12H The following are examples of surgical staplers according to some embodiments of the present invention. First of all, it should be noted that the terms of direction and position involved in the present invention should be understood as relative directions and relative positions, and should not be understood as absolute directions and absolute positions. Figure 2-12A The "first direction D1", "second direction D2" and "third direction D3" mentioned in the present invention are three directions orthogonal in space. Figure 1In the orientation of the surgical stapler shown, the "first direction D1" and the "third direction D3" are generally horizontal directions, the "second direction D2" is generally understood to be a vertical direction, and the "first direction D1" can be understood to be the direction of the distal direction (referring to the direction away from the operator) and the proximal direction (referring to the direction close to the operator). Unless otherwise specified, the "width" mentioned in the present invention refers to the size of the component in the third direction D3.

[0046] Figure 2-Figure 5 An embodiment of the present invention is shown.

[0047] Figure 2 An exemplary right-angle linear surgical stapler configured to be capable of suturing and cutting tissue in various non-endoscopic ("open") surgical procedures, including, for example, colorectal, thoracic, and bariatric surgery, is shown. The surgical stapler 100 (also referred to as a "right-angle linear cutter") generally includes a handle assembly 20, a shaft assembly 24 extending distally from the handle assembly 20, and an end effector 30 located at the distal end of the shaft assembly 24. The end effector 30 is provided with a "right-angle" configuration such that the end effector 30 clamps, suturing, and cutting tissue in a plane extending transversely at right angles to the longitudinal axis defined by the shaft assembly 24.

[0048] The handle assembly 20 includes a housing 21 defining a pistol grip 23, a pair of pivotable triggers 22, which may include a closing trigger and a firing trigger. The closing trigger and the firing trigger are operably coupled to the end effector 30 via the shaft assembly 24, so that the end effector 30 is configured to close and thereby clamp tissue in response to actuation of the closing trigger, and then staple and cut tissue in response to actuation of the firing trigger.

[0049] The end effector 30 includes an anvil portion 32 and a staple cartridge. Figure 2-12G Not shown, but can be referenced Figure 1 1 and 2. The general structure and position of the nail magazine 160 of the end actuator 16 shown in FIG. A support portion 31 for mounting the nail magazine is provided at the distal end of the shaft assembly 24. The anvil portion 32 and the nail magazine are configured to be movable relative to each other along a first direction D1 between an open configuration and a closed configuration, and the anvil portion 32 is formed in an elongated strip shape extending along a second direction D2 perpendicular to the first direction D1.

[0050] The surgical stapler 100 is provided with several actuation systems for operating the end effector 30 via the handle assembly 20 during a surgical procedure on a patient. Specifically, the surgical stapler 100 includes: a retaining pin actuation system, a closing system, and a firing system. The retaining pin actuation system is operable to push the retaining pin distally to initially retain the tissue in the end effector 30. The retaining pin in this embodiment is not shown in the figure, but can be referred to Figure 1 The general structure and position of the retaining pin 176 of the end effector 16 shown in . The closing system is operable to clamp tissue with the end effector 30; the firing system is operable to subsequently suturing and cutting tissue with the end effector 30. Although the teachings of the present invention are shown and described in the context of a "linear" surgical stapler 100 configured to apply linear rows of staples and linear cut lines in tissue, it should be understood that any one or more of the teachings of the present invention may be applied to surgical staplers configured to apply rows of staples and tissue cut lines having non-linear (e.g., curved) configurations, such as surgical staplers of the type disclosed in any one or more of the references incorporated by reference into the present invention.

[0051] The anvil portion 32 includes an anvil portion body, one end of the anvil portion body in the second direction D2 is connected to the support portion 31 via a connecting section 33, and the anvil portion 32, the support portion 31 and the connecting section 33 form a substantially integrated U-shaped member or hook-shaped component. In fact, the surgical stapler includes a left workpiece and a right workpiece docked together along the third direction D3, the left workpiece constituting the common left surface of the anvil portion 32, the connecting section 33 and the support portion 31, and the right workpiece constituting the common right surface of the anvil portion 32, the connecting section 33 and the support portion 31. An anvil plate 321 (anvil plate can also be referred to as an anvil) is provided at a position of the anvil portion body facing the support portion 31, and the anvil plate 321 faces the support portion 31 (i.e., faces the proximal side) and constitutes most of the tissue contact surface of the anvil portion 32.

[0052] A cap portion 322 is provided at the top of the anvil 321, and the cap portion 322 has a cap portion body 3222 located on the top side of the anvil 321 and a section 3221 extending downward along the side wall of the anvil portion body 32. Specifically, the cap portion 322 is actually a part of the support member inside the end effector 30, and the support member includes a hook-shaped support body (not shown in the figure) installed in the anvil portion 32 and the cap portion 322 exposed to the outside. Preferably, the support member is an elongated support structure made of plastic, and the anvil 321 and the side wall of the anvil portion 32 and other components are made of stainless steel. Such a configuration not only ensures the strength of the anvil portion 32, but also reduces the overall weight.

[0053] The cap body 3222 can play a guiding role. In particular, the cap body 3222 has a width that tapers away from the anvil 321 , and the size of the cap body 3222 in the first direction D1 also tapers away from the anvil 321 .

[0054] refer to Figure 3-Figure 5 The tissue contact surface of the anvil portion 32 is formed with a nail forming groove 323 for receiving and shaping the surgical nail and a retaining pin groove 324 for receiving the retaining pin. The nail forming groove 323 and the retaining pin groove 324 are both formed on the anvil plate 321. The nail forming groove 323 has a center line X extending along the second direction D2. In this embodiment, the nail forming grooves 323 are in two rows, each row of nail forming grooves 323 extends along the second direction D2, and the two rows of nail forming grooves 323 are arranged side by side in the third direction D3, then the center line X of this embodiment is located between the two rows of nail forming grooves 323. In other embodiments, more rows of nail forming grooves 323 may be provided, and the center line X is located at the exact center of all rows of nail forming grooves 323 along the third direction D3.

[0055] The retaining pin groove 324 deviates to one side relative to the center line X of the staple groove 323. The retaining pin groove 324 is located on the left side half of the tissue contact surface. In order to allow the anvil portion 32 to abut against the end of the retaining pin when the retaining pin is fired and the retaining pin is not accurately received by the retaining pin groove 324, the cap portion 322 is provided with an extension section 3221 extending along the side wall of the anvil portion body on the left side of the anvil portion body, and the surface of the extension section 3221 facing the staple cartridge also constitutes a part of the tissue contact surface. Specifically, the surface of the extension section 3221 facing the staple cartridge constitutes an additional part of the tissue contact surface, and when the retaining pin is not accurately received in the retaining pin groove 324, the surface of the extension section 3221 facing the staple cartridge can block and abut against the retaining pin, thereby preventing the retaining pin from missing the anvil portion 32 and shooting into the tissue.

[0056] The extension section 3222 of the cap 322 and the anvil 321 together constitute a tissue contact surface. Due to the presence of the extension section 3222, the left half area of ​​the tissue contact surface where the pin groove 324 is located is widened, so that the distance between the pin groove 324 and the left boundary line of the tissue contact surface is also increased. Specifically, the anvil 321 itself is not widened, but the anvil portion 32 is widened by setting the extension section 3221 of the cap 322, especially making the anvil portion 321 have a larger width in the area on the left side where the pin groove 324 is located. However, due to the eccentric setting of the pin groove 324, the size of the pin groove 324 from the left boundary line 325 may still be smaller than the size from the right boundary line 326. For example, the distance S1 between the pin groove 324 and the left boundary line 325 is 1.3mm-1.6mm, and the distance S2 between the pin groove 324 and the right boundary line 326 is 2.8mm-3.1mm. The anvil portion 32 has a uniform width everywhere in the second direction D2 , that is, the anvil portion 32 has the same width at the top and bottom thereof (eg, at one end and the other end in the second direction D2 ).

[0057] Continue to refer Figure 5 The portion of the tissue contact surface located on the left side of the nail groove 323 has a first width W1 (the first width W1 is the minimum distance between the nail groove 323 and the left boundary line 325 of the tissue contact surface), and the portion of the tissue contact surface located on the right side of the nail groove 323 has a second width W2 (the second width W2 is the minimum distance between the nail groove 323 and the right boundary line 326 of the tissue contact surface), and the first width W1 can be greater than or equal to the second width W2.

[0058] In particular, in some embodiments, the first width W1 is 2.5mm-3.0mm, and the second width W2 is 1.5mm-2mm. In this embodiment, the center line X of the nail groove 323 is located at the center of the anvil 321, so that the first width W1 is equal to the second width W2. It should be noted that the edge of the nail groove 232 may have a chamfer. In this embodiment, the measurement of the first width W1 and the second width W2 can both start from the outer contour line of the chamfer of the nail groove 232. However, due to the small size of the chamfer, in some embodiments, the measurement of the first width and the second width can also start from the inner contour line of the chamfer of the nail groove.

[0059] Preferably, the dimension S4 of the extension section 3221 of the cap portion 322 in the second direction D2 is greater than or equal to 5.3 mm, preferably 5.3 mm-5.9 mm. The maximum width S3 of the tissue contact surface is greater than or equal to 1.0 mm, preferably 7.0 mm-8.0 mm, and the area of ​​the tissue contact surface with the maximum width is defined by the extension section 3221 and the anvil 321.

[0060] Continue to refer Figure 5 Preferably, the outer periphery of the retaining pin groove 324 is formed with a chamfered feature structure 3241 for guiding the retaining pin into the retaining pin groove 324. The chamfered feature structure 3241 may be, for example, a continuous ring around the retaining pin groove 324, so that when the end of the retaining pin abuts against any position around the retaining pin groove 324, it can be guided by the chamfered feature structure 3241 to enter the retaining pin groove 324. In this embodiment, the measurement of the distance S1 and the distance S2 may both start from the outer contour line of the chamfered feature structure 3241. However, due to the small size of the chamfered feature structure 3241, in some embodiments, the measurement of the distance S1 and the distance S2 may also start from the inner contour line of the chamfered feature structure.

[0061] In this embodiment, the left and right edges of the tissue contact surface of the anvil portion 32 are both provided with transition surfaces or chamfered cut surfaces. The left boundary line 325 and the right boundary line 326 mentioned in this embodiment refer to the proximal side of the transition surface or the chamfered cut surface (i.e., close to the center line X, the center line X is shown in FIG. Figure 4 ) edge line, and the measurements of dimensions W1, W2, S1, and S2 are all performed on this basis. Since the dimensions of the transition surface or chamfered cut surface are relatively small, other definitions of the left boundary line and the right boundary line may also be used in other embodiments, and the implementation methods of obtaining corresponding dimensions by measurement under other definition methods also fall within the protection scope of the present utility model.

[0062] Transfer back Figure 3 , the extension section 3221 and the anvil portion main body have the same size in the first direction D1, and the respective surfaces of the extension section 3221 and the anvil portion main body facing the nail magazine are flush, that is, the tissue contact surface jointly formed by the extension section 3221 and the anvil plate 321 is a flat plane. Preferably, the outer surface 3221a of the extension section 3221, which is substantially perpendicular to the third direction D3, is formed as an arcuate surface that gradually approaches the side wall of the anvil portion main body in a direction away from the cap portion main body 3222 and terminates at the side wall of the anvil portion main body. It should be noted that the "substantially perpendicular" mentioned here is an expression used to describe an arc surface (usually, a surface perpendicular to one aspect will be a plane), and its specific meaning can be clearly and unambiguously known.

[0063] Transfer back Figure 2-Figure 3 At two side surfaces of the anvil portion 32 perpendicular to the third direction D3, the side walls of the connecting section 33 protrude from the side walls of the anvil portion 32, so that a connecting position 324 of the connecting section 33 and the anvil portion 32 forms a step portion.

[0064] In other optional embodiments, at the right side surface of the anvil portion 32 perpendicular to the third direction D3, the side wall of the connection area between the anvil portion 32 and the connecting section 33, the side wall of the anvil portion 32, and the side wall of the connecting section 33 may also be in the same plane. Specifically, in some embodiments not shown, since the retaining pin groove is biased to the left relative to the center line, the left side surface of the one-piece formed by the left workpiece is a plane, and the right side surface of the one-piece formed by the right workpiece opposite to the left workpiece is a non-plane. If the retaining pin groove is biased to the right relative to the center line, then preferably the right side surface of the one-piece formed by the right workpiece is a plane, and the left side surface of the one-piece formed by the left workpiece opposite thereto may be a non-plane.

[0065] The anvil portion 32 configuration of the above embodiment is particularly suitable for a surgical stapler 100 that operates a retaining pin at the distal end. Specifically, a trigger for operably firing a surgical staple is provided on the handle assembly 20, and a retaining pin operating component for operably firing a retaining pin is provided on the end effector 30. Operating the retaining pin at the distal end is prone to retaining pin deviation, and the cap portion with an extension section provided in the above embodiment can compensate for this defect.

[0066] Figure 6-Figure 9 Another embodiment according to the utility model is shown. Therein, a step is formed between the extension section 4221 of the cap 422 and the anvil 421, and the surface of the extension section 4221 of the cap 422 facing the nail magazine (not shown) and the surface of the anvil 421 facing the nail magazine are not flush. Specifically, the surface of the extension section 4221 facing the nail magazine mounted on the mounting portion 41 is farther away from the nail magazine relative to the surface of the anvil portion main body facing the nail magazine, so that a gap appears between the surface of the extension section 4221 of the cap 422 facing the mounting portion 41 and the surface of the anvil 421 facing the mounting portion 41. This gap is particularly beneficial to the processing of the end actuator, for example, to facilitate injection molding, welding, demolding and other operations. Reference Figure 7 The extension section 4221 is a flat plate structure with uniform width (or thickness).

[0067] The cap 422 and the anvil 421 together constitute a tissue contact surface, which is not a flat plane. The left half area of ​​the tissue contact surface where the pin groove 424 is located is widened, so that the distance between the pin groove 424 and the left boundary line of the tissue contact surface is also increased. Specifically, the anvil 421 itself is not widened, but the anvil portion 42 is widened by setting the extension section 4221 of the cap 422, especially making the anvil portion 421 have a larger width in the area on the left side where the pin groove 424 is located. However, due to the eccentric setting of the pin groove 424, the size of the pin groove 424 from the left boundary line 425 may still be smaller than the size of the pin groove 424 from the right boundary line 426. For example, the distance S2 between the pin groove 424 and the left boundary line 425 is 1.3mm-1.6mm, and the distance S2 between the pin groove 424 and the right boundary line 426 is 2.8mm-3.1mm. The anvil portion 42 has a uniform width everywhere in the second direction D2 , that is, the anvil portion 42 has the same width at the top and bottom thereof (eg, at one end and the other end in the second direction D2 ).

[0068] Continue to refer Fig. 9 , the portion of the tissue contact surface located on the left side of the staple groove 423 has a first width W1 (the first width W1 is the minimum distance between the staple groove 423 and the left boundary line 425 of the tissue contact surface), and the portion of the tissue contact surface located on the right side of the staple groove 423 has a second width W2 (the second width W2 is the minimum distance between the staple groove 423 and the right boundary line 426 of the tissue contact surface), and the first width W1 is greater than or equal to the second width W2. In particular, in some embodiments, the first width W1 is 2.0mm-3.0mm, and the second width W2 is 1.5mm-2.5mm. The dimension of the extension section 4221 of the cap portion 422 in the second direction D2 is greater than or equal to 5.3mm, preferably 5.3mm-5.9mm. The maximum width of the tissue contact surface is greater than or equal to 7.0mm, preferably 7.0mm-8.0mm.

[0069] In the present embodiment, the connection area 44 between the anvil portion 42 and the connection section 43 is also formed as a protrusion or a step.

[0070] Unless otherwise stated, Figure 2-Figure 5 The description of the illustrated embodiment also applies to Figure 6-Figure 9 The implementation method is not described in detail for the sake of brevity.

[0071] Figure 10-12GAnother embodiment of the present invention is shown. The cap 522 has a cap body located on the top side of the anvil 521 and an extension section 5221 extending downward from the cap body. The anvil 521 has a portion 5211 extending along the third direction to cover the surface of the extension section 5221 facing the staple cartridge installed on the mounting portion 51, so that the tissue contact surface is completely defined by the anvil 521. Figure 3 In the embodiment shown in , the outer surface of the extension section 5221 that is substantially perpendicular to the third direction D3 is formed as an arcuate surface that gradually approaches the side wall 527 of the anvil portion body in a direction away from the cap portion body and terminates at the side wall 527 of the anvil portion body.

[0072] The anvil 521 constitutes the tissue contact surface alone, and the extension section 5221 of the cap is used to support part of the tissue contact surface. The left half area of ​​the tissue contact surface where the pin groove 524 is located is widened, so that the distance between the pin groove 524 and the left boundary line 525 of the tissue contact surface is also increased. Specifically, the anvil 521 itself is widened, and the extension section 5221 of the cap 522 is provided to support the widened portion, especially to make the anvil portion 521 have a larger width in the area on the left side where the pin groove 524 is located. However, due to the eccentric arrangement of the pin groove 524, the size of the pin groove 524 from the left boundary line 525 may still be smaller than the size from the right boundary line 526. For example, the distance S1 between the pin groove 524 and the left boundary line 525 is 1.3mm-1.6mm, and the distance S2 between the pin groove 524 and the right boundary line 526 is 2.8mm-3.1mm. The surface of the joint between the cap body and the anvil plate 521 facing the nail magazine is flush with the surface of the anvil plate 521 facing the nail magazine.

[0073] Continue to refer Fig. 12A The portion of the tissue contact surface located on the left side of the nail groove 523 has a first width W1 (the first width W1 is the minimum distance between the nail groove 523 and the left boundary line 525 of the tissue contact surface), and the portion of the tissue contact surface located on the right side of the nail groove 523 has a second width W2 (the second width W2 is the minimum distance between the nail groove 523 and the right boundary line 526 of the tissue contact surface), and the first width W1 is greater than or equal to the second width W2.

[0074] In particular, in some embodiments, the first width W1 is 2.0 mm to 3.0 mm, and the second width W2 is 1.5 mm to 2.5 mm. The dimension of the extension section 5221 of the cap portion 522 in the second direction D2 is greater than or equal to 5.3 mm, preferably 5.3 mm to 5.9 mm. The maximum width of the tissue contact surface is greater than or equal to 7.0 mm, preferably 7.0 mm to 8.0 mm. The specific shape of the anvil portion 521 is Figure 12B-12H Shown in.

[0075] Continue to refer Fig. 12A , the chamfered feature structure 5241 of the outer periphery of the retaining pin groove 524, in addition to being similar to Figure 5 In addition to the annular portion shown in the figure, the chamfered feature structure 5241 also has a rectangular portion disposed proximate to the left side of the retaining pin groove 524 (i.e., the widened side of the anvil plate 521). The widened anvil plate 521 and the chamfered feature structure 5241 having a rectangular portion can be used together to improve the tolerance of the retaining pin orientation, facilitating the guide of the retaining pin offset to the left side of the retaining pin groove 524 into the retaining pin groove 524.

[0076] Unless otherwise stated, Figure 2-Figure 5 The description of the illustrated embodiment also applies to Figure 10-12H The implementation method is not described in detail for the sake of brevity.

[0077] The surgical stapler provided by the utility model can allow the positional deviation generated when firing the retaining pin as much as possible, for example, even if the retaining pin is not accurately received by the retaining pin groove, the end of the retaining pin will abut against the additional area of ​​the tissue contact surface of the anvil portion, and will not miss the anvil portion and enter the tissue, and the additional area of ​​the tissue contact surface can be formed by the extension section of the cap portion or supported by the extension section. The retaining pin abuts against the increased tissue contact surface, thereby applying a resisting driving force toward the far side to the anvil, and the movement of the anvil portion and the staple cartridge toward the closed configuration actuation is blocked, or the anvil portion and the staple cartridge cannot be actuated to the closed configuration, which can enable the operator to perceive the abnormality of the guide pin actuation. In addition, the retaining pin abutting against the tissue contact surface of the anvil portion can return to the retaining pin groove under subsequent slight shaking or similar operations to allow subsequent surgical operations.

[0078] The scope of protection of the present utility model is limited only by the claims. The "various embodiments", "some embodiments", "one embodiment" or "embodiment" mentioned in this specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment. Therefore, the phrases "in various embodiments", "in some embodiments", "in one embodiment" or "in an embodiment" appearing in this specification do not necessarily refer to the same embodiment. In addition, in one or more embodiments, specific features, structures or characteristics may be combined in any suitable manner. Therefore, in the absence of conflict, the specific features, structures or characteristics shown or described in conjunction with one embodiment may be combined in whole or in part with the features, structures or characteristics of one or more other embodiments, and the resulting modifications and variations also fall within the scope of the present utility model.

Claims

1. A surgical stapler (100), comprising a handle assembly (20) for an operator to hold and an end actuator (30) located at the distal end of the handle assembly in a first direction (D1), the end actuator comprising an anvil portion (32) and a staple cartridge, the anvil portion (32) and the staple cartridge being configured to be movable relative to each other along the first direction between an open configuration and a closed configuration, the anvil portion (32) being formed into a long strip extending along a second direction (D2) perpendicular to the first direction (D1), wherein: The surgical stapler is configured to fire the surgical staples in the staple cartridge toward the anvil portion (32); The anvil portion (32) has a proximal tissue contact surface formed with a staple groove (323) for receiving and shaping the surgical staple and a retaining pin groove (324) for receiving a retaining pin provided on the staple magazine, and the anvil portion (32) includes an anvil portion body and a cap portion located at the end of the anvil portion body. Wherein, the nail forming groove (323) has a center line (X) extending along the second direction, the retaining pin groove (324) deviates to one side relative to the center line, and the cap portion has an extension section extending along the side wall of the anvil portion body on the one side of the anvil portion body.

2. The surgical stapler according to claim 1, characterized in that: A dimension (S4) of the extending section of the cap portion in the second direction is greater than or equal to 5.3 mm.

3. The surgical stapler according to claim 2, characterized in that: A dimension (S4) of the extending section of the cap portion in the second direction is 5.3 mm-5.9 mm.

4. The surgical stapler according to claim 1, characterized in that: The maximum width (S3) of the tissue contact surface is greater than or equal to 7.0 mm.

5. The surgical stapler according to claim 4, characterized in that: The maximum width (S3) of the tissue contact surface is 7.0 mm-8.0 mm.

6. The surgical stapler according to claim 1, characterized in that: The cap portion includes a cap portion body located on one side of the anvil portion body in the second direction, the cap portion body having a width that tapers in the direction away from the nail forming groove, and the size of the cap portion body in the first direction also tapers in the direction away from the nail forming groove.

7. The surgical stapler according to claim 1, characterized in that: The anvil portion (32) includes a support member, which includes a support body installed in the anvil portion body and the cap portion exposed to the outside, wherein the support member is an elongated support structure made of plastic, and the anvil plate of the anvil portion is a plate-like structure made of stainless steel.

8. The surgical stapler according to claim 1, characterized in that: A trigger for operably firing the surgical nail is disposed on the handle assembly (20), and a retaining pin operating component for operably firing the retaining pin is disposed on the end actuator (30).

9. The surgical stapler according to claim 1, characterized in that: A chamfered feature structure is formed around the retaining pin groove for guiding the retaining pin into the retaining pin groove.

10. The surgical stapler according to claim 9, characterized in that: The chamfer feature includes a continuous annular portion surrounding the retaining pin groove.

11. The surgical stapler according to claim 9, characterized in that: The chamfer feature includes a rectangular portion disposed only on the one side of the retaining pin recess.

12. The surgical stapler according to claim 1, characterized in that: The extension section and a surface of the anvil portion body that faces the staple cartridge together constitute the tissue contact surface.

13. The surgical stapler according to any one of claims 1 to 12, characterized in that: The extension section and the anvil portion main body have the same dimensions in the first direction, and respective surfaces of the extension section and the anvil portion main body facing the nail magazine are flush.

14. The surgical stapler according to claim 13, characterized in that: The cap portion includes a cap portion body located on one side of the anvil portion body in the second direction (D2), and the outer surface (3221a) of the extension section which is substantially perpendicular to the third direction is formed as an arcuate surface which gradually approaches the side wall of the anvil portion body in a direction away from the cap portion body and terminates at the side wall of the anvil portion body.

15. The surgical stapler according to any one of claims 1 to 12, characterized in that: A surface of the extension section facing the staple cartridge is further away from the staple cartridge than a surface of the anvil portion body facing the staple cartridge.

16. The surgical stapler according to claim 15, characterized in that: The extension section is a flat plate structure with uniform width.

17. The surgical stapler according to any one of claims 1 to 11, characterized in that: The anvil portion body includes an anvil plate (521) having the staple groove, and the anvil plate (521) has a portion extending along a third direction (D3) to cover the surface of the extension section facing the staple magazine, so that the tissue contact surface is completely defined by the anvil plate (521).

18. The surgical stapler according to claim 17, characterized in that: The cap portion includes a cap portion body located on one side of the anvil portion body in the second direction (D2), and the outer surface of the extension section approximately perpendicular to the third direction is formed as an arcuate surface that gradually approaches the side wall of the anvil portion body in a direction away from the cap portion body and terminates at the side wall of the anvil portion body.

19. The surgical stapler according to claim 18, characterized in that: The surface of the joint between the cap body and the anvil plate (521) facing the nail magazine is flush with the surface of the anvil plate (521) facing the nail magazine.

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