Surgical stapler comprising cap having extended section
Patent Information
- Application Number
- CN202410504668.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-10-28
Smart Images
Figure CN120837142A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of surgical instruments, and more specifically, to a surgical suture device / anastomosis device. Background Technology
[0002] Surgical staplers / anastomosers are commonly used to deploy staples into tissue to reduce or eliminate tissue bleeding, such as when tissue is cut and needs to be sutured to promote healing. Surgical staplers / anastomosers (e.g., linear staplers / anastomosers, arc-shaped staplers / anastomosers) may include an end effector assembly having a staple cartridge and an anvil, the end effector assembly being capable of securing tissue between the staple cartridge and the anvil, wherein the staple cartridge includes a cartridge configured to removably store surgical staples therein, and the anvil includes a staple-forming groove for shaping the staples. Such surgical staplers / anastomosers typically include a closure system that allows movement of one of the staple cartridge and the anvil relative to the other.
[0003] As described above, a surgical stapler / anastomosing device can be configured to close the cartridge and anvil portions of the end effector assembly to form a closed configuration for capturing tissue between the cartridge and anvil. In the closed configuration, the cartridge and anvil apply clamping forces to the tissue to hold it between the anvil and cartridge. Staples are then driven to deform from the cartridge and abut against the staple-forming grooves of the anvil, thereby securing the tissue layers together. Staples are typically deployed in several staple threads or rows for more reliable securing of the tissue layers together. The end effector assembly may not include a cutting member or may include a cutting member capable of advancing between staple rows to cut the tissue after the tissue layers have been sutured together.
[0004] like Figure 1 An existing end effector 16 is shown. A U-shaped distal support structure 48 defining the end effector 16 has a cartridge mounting portion 52 that removably receives a cartridge 160. The end effector 16 is also configured to laterally receive or “reload” tissue within the gap between the cartridge housing 162 and the anvil 210 defined within the cartridge 160 mounted within the end effector 16. The end effector 16 also includes a retaining pin 176 that can extend distally from the 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 can be, for example... Figure 1 The manipulator is operated by pushing the pin from the handle end, or by the user pushing it from the end effector, so that the retaining pin is received by the corresponding position on the anvil. However, the retaining pin can easily deviate from its intended target. Once it deviates, it may miss the anvil and penetrate the surrounding tissue, failing to achieve the subsequent surgical purpose and potentially causing tissue damage.
[0005] Therefore, there is a need to provide a surgical suture device that can at least partially solve the above problems. Summary of the Invention
[0006] This invention provides a surgical suture device, the anvil portion of which includes a cap with an extension. The extension of the cap can serve as an additional tissue contact surface or to support a widened tissue contact surface. This arrangement allows for a certain degree of error when firing the retaining pin; for example, even if the retaining pin is not accurately received by the retaining pin groove, the end of the retaining pin will still abut against the tissue contact surface of the anvil portion, without missing the anvil portion and entering the tissue. The retaining pin abutting against the tissue contact surface of the anvil portion can return to the retaining pin groove with subsequent slight shaking or similar operations to allow for subsequent surgical procedures.
[0007] According to one aspect of the invention, a surgical stapler is provided, the surgical stapler comprising a handle assembly for an operator to hold and an end actuator located distal to 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 as an elongated strip extending along a second direction perpendicular to the first direction, wherein:
[0008] The surgical stapler is configured to fire surgical staples from the staple cartridge toward the anvil.
[0009] The anvil portion has a proximal tissue contact surface with a staple-forming groove for receiving and shaping the surgical staple, and a retaining pin groove for receiving a retaining pin disposed on the staple cartridge. The anvil portion includes an anvil portion body and a cap portion located at the end of the anvil portion body.
[0010] The pin-forming groove has a center line extending along the second direction, the retaining pin groove is offset to one side relative to the center line, and the cap has an extension section extending along the side wall of the anvil body on the same side of the anvil body.
[0011] In one embodiment, the extension of the cap portion has a dimension of 5.3 mm or greater in the second direction.
[0012] In one embodiment, the extension of the cap portion has a dimension of 5.3mm-5.9mm in the second direction.
[0013] In one embodiment, the maximum width of the tissue contact surface is greater than or equal to 7.0 mm.
[0014] In one embodiment, the maximum width of the tissue contact surface is 7.0 mm to 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 away from the snagging groove, and the size of the cap portion body in the first direction also tapers away from the snagging groove.
[0016] In one embodiment, the anvil portion includes a support member comprising a support body installed within the anvil portion body and the exposed cap portion, wherein the support member is made of plastic and the portion of the anvil portion other than the support member is made of stainless steel.
[0017] In one embodiment, a trigger for operably firing the surgical nail is disposed on the shank assembly, and a retaining pin operating component for operably firing the retaining pin is disposed on the end effector.
[0018] In one embodiment, the outer periphery of the retaining pin groove is formed with a chamfered feature structure for guiding the retaining pin into the retaining pin groove.
[0019] In one embodiment, the chamfered feature includes a continuous annular portion surrounding the retaining pin groove.
[0020] In one embodiment, the chamfered feature structure includes a rectangular portion disposed only on one side of the retaining pin groove.
[0021] In one embodiment, the surfaces of the extension section and the anvil body facing the staple cartridge together constitute the tissue contact surface.
[0022] In one embodiment, the extension segment and the anvil body are dimensionally identical in the first direction, and the respective surfaces of the extension segment and the anvil body facing the staple cartridge 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 portion, which is generally perpendicular to the third direction, is formed as an arcuate surface that gradually approaches the sidewall of the anvil portion body in a direction away from the cap portion body and terminates at the sidewall of the anvil portion body.
[0024] In one embodiment, the surfaces of the extension section and the staple cartridge are further away from the staple cartridge than the surfaces of the anvil body and the staple cartridge.
[0025] In one embodiment, the extension segment is a flat plate structure with uniform width.
[0026] In one embodiment, the anvil body includes an anvil plate having the staple-forming groove, the anvil plate having a portion extending in a third direction to cover the surface of the extension section facing the staple cartridge, such 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 portion, which is generally perpendicular to the third direction, is formed as an arcuate surface that gradually approaches the sidewall of the anvil portion body in a direction away from the cap portion body and terminates at the sidewall of the anvil portion body.
[0028] In one embodiment, the surface of the cap body that joins the anvil and faces the nail cartridge is flush with the surface of the anvil that faces the nail cartridge. Attached Figure Description
[0029] The invention, its features and advantages, will be better understood through the following description, taken in conjunction with the accompanying drawings and exemplary embodiments. In the following description and drawings, similar parts are labeled with similar numbers. The drawings are not necessarily drawn to scale, and for clarity and brevity, some parts may be omitted, and some drawings may be drawn in an exaggerated or simplified manner.
[0030] Figure 1 An end effector of a conventional surgical suture is shown;
[0031] Figure 2 An exemplary perspective view of a surgical suture device according to one embodiment of the present invention is shown;
[0032] Figure 3 for Figure 2 An enlarged view of the end effector section;
[0033] Figure 4 for Figure 2 Side view of the anvil portion;
[0034] Figure 5 for Figure 4 A magnified view of a portion of the image;
[0035] Figure 6 A perspective view of the end effector of a surgical suture device according to another embodiment of the present invention;
[0036] Figure 7 for Figure 6 A magnified view of a portion of the image;
[0037] Figure 8 for Figure 6 Side view of the anvil portion;
[0038] Figure 9 for Figure 8 A magnified view of a portion of the image;
[0039] Figure 10 A perspective view of an end effector according to yet another embodiment of the present invention;
[0040] Figure 11 for Figure 10 Side view of the anvil portion;
[0041] Figure 12A for Figure 11 A magnified view of a portion of the image;
[0042] Figure 12B for Figure 11 A three-dimensional diagram of the cutting board in the image;
[0043] Figures 12C-12H for Figure 12B The six views of the cutting board in the image, where, Figure 12C This is the front view of the anvil. Figure 12D This is a rear view of the anvil. Figure 12E This is a left view of the anvil. Figure 12F This is a right view of the anvil. Figure 12G This is a top view of the anvil. Figure 12H This is a bottom view of the anvil. Detailed Implementation
[0044] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely exemplary embodiments of the present invention, and those skilled in the art can conceive of other ways to implement the present invention based on these exemplary embodiments, and such other ways also fall within the scope of the present invention.
[0045] Figures 2-12H Exemplary surgical suture devices according to some embodiments of the present invention are illustrated. It should first be noted that the directional and positional terms involved in this invention should be understood as relative directions and relative positions, and not as absolute directions and absolute positions. The directional and positional terms involved in this invention can be referenced... Figures 2-12A This invention relates to the orientation of surgical suture devices. The "first direction D1," "second direction D2," and "third direction D3" mentioned in this invention refer to three orthogonal directions in space. Among them, in... Figure 1In the orientation of the surgical suture device shown, "first direction D1" and "third direction D3" are approximately horizontal, "second direction D2" is generally understood to be vertical, and "first direction D1" can be understood as the direction containing the distal direction (referring to the direction away from the operator) and the proximal direction (referring to the direction closer to the operator). Unless otherwise specified, the "width" mentioned in this invention refers to the dimension of the component in the third direction D3.
[0046] Figures 2-5 An embodiment of the present invention is shown.
[0047] Figure 2 An exemplary right-angle linear surgical stapler configured to suture and cut tissue in a variety of non-endoscopic (“open”) surgical procedures, including, for example, colorectal, thoracic, and bariatric surgeries. This 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 configured in a “right-angle” configuration such that it clamps, sutures, and cuts tissue in a plane extending laterally 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 and a pair of pivotable triggers 22, which may include a closing trigger and a firing trigger. The closing trigger and the firing trigger are operatively coupled to an end effector 30 via a shaft assembly 24, such that the end effector 30 is configured to close and thereby clamp tissue in response to actuation of the closing trigger, and subsequently suture and cut the tissue in response to actuation of the firing trigger.
[0049] The end effector 30 includes an anvil portion 32 and a staple cartridge. In this embodiment, the staple cartridge is... Figures 2-12H Not shown in the image, but can be referenced. Figure 1 The diagram shows the general structure and location of the staple cartridge 160 of the end effector 16. A support portion 31 for mounting the staple cartridge is provided at the distal end of the shaft assembly 24. The anvil portion 32 and the staple cartridge are configured to move relative to each other along a first direction D1 between an open configuration and a closed configuration. The anvil portion 32 is formed as an elongated strip 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 surgical procedures on a patient. Specifically, the surgical stapler 100 includes a retaining pin actuation system, a closure system, and a firing system. The retaining pin actuation system is operable to push the retaining pin distally to initially retain tissue within the end effector 30. The retaining pin in this embodiment is not shown in the figures but can be referenced. Figure 1 The approximate structure and location of the retaining pin 176 of the end effector 16 are shown. The closure system is operable to clamp tissue with the end effector 30; the firing system is operable to subsequently suture and cut tissue with the end effector 30. Although the teachings of the invention are shown and described in the context of a “linear” surgical suture 100 configured to apply linear staples and linear cutting lines in tissue, it should be understood that any one or more of the teachings of the invention can be applied to surgical sutures configured to apply staples and tissue cutting lines with a non-linear (e.g., curved) configuration, such as surgical sutures of the type disclosed in any one or more of the references incorporated herein by reference.
[0051] The anvil portion 32 includes an anvil portion body, one end of which is connected to the support portion 31 via a connecting section 33 in the second direction D2. The anvil portion 32, the support portion 31, and the connecting section 33 form a generally integral U-shaped component or hook-shaped part. In fact, the surgical suture device includes a left-side workpiece and a right-side workpiece mated together along a third direction D3. The left-side workpiece forms the common left-side surface of the anvil portion 32, the connecting section 33, and the support portion 31, while the right-side workpiece forms the common right-side surface of the anvil portion 32, the connecting section 33, and the support portion 31. An anvil plate 321 (which can also be referred to as an anvil) is positioned facing the support portion 31 on the anvil portion body. The anvil plate 321 faces the support portion 31 (i.e., faces proximally) and constitutes most of the tissue contact surface of the anvil portion 32.
[0052] A cap 322 is provided at the top of the cutting board 321. The cap 322 has a cap body 3222 located on the top side of the cutting board 321 and a section 3221 extending downward along the side wall of the anvil body 32. Specifically, the cap 322 is actually part of a support member inside the end effector 30. The support member includes a hook-shaped support body (not shown in the figure) installed inside the anvil body 32 and the exposed cap 322. Preferably, the support member is made of plastic, while components such as the cutting board 321 and the side wall of the anvil body 32 are made of stainless steel. This arrangement ensures the strength of the anvil body 32 while reducing the overall weight.
[0053] The cap body 3222 can serve as a guide. 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 Figures 3-5 The anvil portion 32 has a staple-forming groove 323 for receiving and shaping surgical staples, and a retaining pin groove 324 for receiving retaining pins, formed in the tissue contact surface. Both the staple-forming groove 323 and the retaining pin groove 324 are formed on the anvil plate 321. The staple-forming groove 323 has a center line X extending along the second direction D2. In this embodiment, the staple-forming grooves 323 are arranged in two rows, each row extending along the second direction D2, with the two rows arranged side-by-side in the third direction D3. In this embodiment, the center line X is located between the two rows of staple-forming grooves 323. In other embodiments, more rows of staple-forming grooves 323 may be provided, with the center line X located at the exact center of all rows of staple-forming grooves 323 along the third direction D3.
[0055] The retaining pin groove 324 is offset to one side relative to the centerline X of the stud groove 323. The retaining pin groove 324 is located on the left 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 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. The surface of the extension section 3221 facing the stud cartridge also constitutes part of the tissue contact surface. Specifically, the surface of the extension section 3221 facing the stud cartridge constitutes an additional part of the tissue contact surface. When the retaining pin is not accurately received in the retaining pin groove 324, the surface of the extension section 3221 facing the stud cartridge can block and abut against the retaining pin, preventing the retaining pin from missing the anvil portion 32 and entering the tissue.
[0056] The extension 3222 of the cap 322 and the anvil 321 together constitute the tissue contact surface. Due to the presence of the extension 3222, the left half of the tissue contact surface where the retaining pin groove 324 is located is widened, thus increasing the distance between the retaining pin groove 324 and the left boundary line of the tissue contact surface. Specifically, the anvil 321 itself is not widened; instead, the anvil portion 32 is widened by providing the extension 3221 of the cap 322, especially giving the anvil portion 321 a greater width in the area to the left of the retaining pin groove 324. However, because the retaining pin groove 324 is eccentrically positioned, the distance between the retaining pin groove 324 and the left boundary line 325 may still be smaller than its distance from the right boundary line 326. For example, the distance S1 between the retaining pin groove 324 and the left boundary line 325 is 1.3mm-1.6mm, and the distance S2 between the retaining pin groove 324 and the right boundary line 326 is 2.8mm-3.1mm. The anvil portion 32 has a uniform width at all points along the second direction D2, that is, the anvil portion 32 has the same width at its top and bottom (e.g., at one end and the other end along the second direction D2).
[0057] Continue to refer to Figure 5 The portion of the tissue contact surface located on the left side of the staple groove 323 has a first width W1 (the first width W1 is the minimum distance between the staple 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 staple groove 323 has a second width W2 (the second width W2 is the minimum distance between the staple groove 323 and the right boundary line 326 of the tissue contact surface). The first width W1 can be greater than or equal to the second width W2.
[0058] Specifically, 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 rivet groove 323 is located at the exact center of the anvil 321, such that the first width W1 is equal to the second width W2. It should be noted that the edge of the rivet groove 232 may have a chamfer, and 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 rivet groove 232. However, since the chamfer size is small, 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 rivet groove.
[0059] Preferably, the dimension S4 of the extension segment 3221 of the cap portion 322 in the second direction D2 is greater than or equal to 5.3 mm, and more preferably 5.3 mm to 5.9 mm. The maximum width S3 of the tissue contact surface is greater than or equal to 1.0 mm, and more preferably 7.0 mm to 8.0 mm. The area of the tissue contact surface with the maximum width is jointly defined by the extension segment 3221 and the anvil 321.
[0060] Continue to refer to 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 can be, for example, a continuous annulus surrounding the retaining pin groove 324, such that the end of the retaining pin can be guided into the retaining pin groove 324 by the chamfered feature structure 3241 at any position around the retaining pin groove 324. In this embodiment, the measurement of distances S1 and S2 can both start from the outer contour line of the chamfered feature structure 3241. However, since the size of the chamfered feature structure 3241 is small, in some embodiments, the measurement of distances S1 and S2 can 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 provided with transition surfaces or chamfered cut surfaces. The left boundary line 325 and right boundary line 326 mentioned in this embodiment refer to the transition surfaces or chamfered cut surfaces near the proximal side (i.e., near the center line X, see center line X). Figure 4 The measurements of the edge lines, dimensions W1, W2, S1, and S2, are all based on this. Since the dimensions of the transition surface or chamfered section are relatively small, other embodiments may also have other definitions of the left and right boundary lines. Embodiments where the corresponding dimensions are obtained through measurements under other definitions also fall within the scope of protection of this invention.
[0062] Turn back Figure 3 The extension segment 3221 and the anvil body have the same dimensions in the first direction D1, and the respective surfaces of the extension segment 3221 and the anvil body facing the staple cartridge are flush. That is, the tissue contact surface formed by the extension segment 3221 and the anvil 321 is a flat plane. Preferably, the outer surface 3221a of the extension segment 3221, which is approximately perpendicular to the third direction D3, is formed as an arcuate surface that gradually approaches the sidewall of the anvil body in a direction away from the cap body 3222 and terminates at the sidewall of the anvil body. It should be noted that the term "approximately perpendicular" is used to describe an arcuate surface (generally, a surface perpendicular to one aspect is a plane), and its specific meaning is clear and unambiguous.
[0063] Turn back Figures 2-3 At the two sides of the anvil portion 32 perpendicular to the third direction D3, the sidewall of the connecting section 33 protrudes from the sidewall of the anvil portion 32, so that the connection position 324 between the connecting section 33 and the anvil portion 32 forms a stepped portion.
[0064] In other alternative embodiments, on the right side of the anvil portion 32 perpendicular to the third direction D3, the sidewalls of the connection area between the anvil portion 32 and the connecting section 33, the sidewalls of the anvil portion 32, and the sidewalls of the connecting section 33 may also be in the same plane. Specifically, in some embodiments not shown, since the retaining pin groove is offset to the left relative to the center line, the integral left surface of the left workpiece is planar, and the integral right surface of the right workpiece opposite to the left workpiece is non-planar. If the retaining pin groove is offset to the right relative to the center line, then preferably the integral right surface of the right workpiece is planar, and the integral left surface of the left workpiece opposite to it can be non-planar.
[0065] The anvil portion 32 configuration of the above embodiment is particularly suitable for surgical staplers 100 that operate the retaining pin distally. Specifically, a trigger for operably firing the surgical staple is provided on the handle assembly 20, while a retaining pin operating member for operably firing the retaining pin is provided on the end actuator 30. Operating the retaining pin distally can easily cause retaining pin misalignment, and the cap with an extended section provided in the above embodiment can compensate for this deficiency.
[0066] Figures 6-9 Another embodiment according to the invention is shown. In this embodiment, a step is formed between the extension segment 4221 of the cap 422 and the anvil 421, and the surface of the extension segment 4221 facing the staple cartridge (not shown) and the surface of the anvil 421 facing the staple cartridge are not flush. Specifically, the surface of the extension segment 4221 facing the staple cartridge mounted on the mounting portion 41 is further away from the staple cartridge than the surface of the anvil body facing the staple cartridge, resulting in a gap between the surface of the extension segment 4221 facing the mounting portion 41 and the surface of the anvil 421 facing the mounting portion 41. This gap is particularly beneficial for the machining of the end effector, such as facilitating 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 form a tissue contact surface, which is not a flat plane. The left half of the tissue contact surface where the retaining pin groove 424 is located is widened, thus increasing the distance between the retaining pin groove 424 and the left boundary line of the tissue contact surface. Specifically, the anvil 421 itself is not widened, but the anvil portion 42 is widened by providing an extension 4221 of the cap 422, especially making the anvil portion 421 have a larger width in the area to the left of the retaining pin groove 424. However, due to the eccentric arrangement of the retaining pin groove 424, the distance between the retaining pin groove 424 and the left boundary line 425 may still be smaller than its distance from the right boundary line 426. For example, the distance S2 between the retaining pin groove 424 and the left boundary line 425 is 1.3mm-1.6mm, and the distance S2 between the retaining pin groove 424 and the right boundary line 426 is 2.8mm-3.1mm. The anvil portion 42 has a uniform width at all points in the second direction D2, that is, the anvil portion 42 has the same width at its top and bottom (e.g., at one end and the other end in the second direction D2).
[0068] Continue to refer to Figure 9 The portion of the tissue contact surface located to the left 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 to the right 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), wherein the first width W1 is greater than or equal to the second width W2. Specifically, 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 extension segment 4221 of the cap portion 422 has a dimension greater than or equal to 5.3 mm in the second direction D2, 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.
[0069] In this embodiment, the connection area 44 between the anvil portion 42 and the connecting section 43 is also formed as a protrusion or a step.
[0070] Unless otherwise stated, Figures 2-5 The description of the embodiments shown also applies to... Figures 6-9 The implementation method will not be described in detail for the sake of simplicity.
[0071] Figures 10-12HAnother embodiment according to the invention is shown. The cap 522 has a cap body located on top of the anvil 521 and an extension segment 5221 extending downward from the cap body. The anvil 521 has a portion 5211 extending in a third direction to cover the surface of the extension segment 5221 facing the mounting portion 51 on which a staple cartridge is mounted, such that the tissue contact surface is completely defined by the anvil 521. Similar to... Figure 3 In the embodiment shown, the outer surface of the extension segment 5221, which is generally perpendicular to the third direction D3, is formed as an arcuate surface that gradually approaches the side wall 527 of the anvil body in a direction away from the cap body and terminates at the side wall 527 of the anvil body.
[0072] The cutting board 521 constitutes the tissue contact surface on its own, and the extension 5221 of the cap serves to support the tissue contact surface. The left half of the tissue contact surface where the retaining pin groove 524 is located is widened, thereby increasing the distance between the retaining pin groove 524 and the left boundary line 525 of the tissue contact surface. Specifically, the cutting board 521 itself is widened, and this widened portion is supported by the extension 5221 of the cap 522, especially making the anvil portion 521 have a larger width in the area to the left of the retaining pin groove 524. However, due to the eccentric arrangement of the retaining pin groove 524, the distance between the retaining pin groove 524 and the left boundary line 525 may still be smaller than its distance from the right boundary line 526. For example, the distance S1 between the retaining pin groove 524 and the left boundary line 525 is 1.3mm-1.6mm, and the distance S2 between the retaining pin groove 524 and the right boundary line 526 is 2.8mm-3.1mm. The surface of the cap body that joins the anvil 521 and faces the nail cartridge is flush with the surface of the anvil 521 that faces the nail cartridge.
[0073] Continue to refer to Figure 12A The portion of the tissue contact surface located on the left side of the staple groove 523 has a first width W1 (the first width W1 is the minimum distance between the staple 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 staple groove 523 has a second width W2 (the second width W2 is the minimum distance between the staple 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] Specifically, in some embodiments, the first width W1 is 2.0mm-3.0mm, and the second width W2 is 1.5mm-2.5mm. The extension segment 5221 of the cap portion 522 has a dimension greater than or equal to 5.3mm in the second direction D2, 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. The specific shape of the anvil portion 521 is described in... Figures 12B-12H Shown in.
[0075] Continue to refer to Figure 12A The chamfered feature structure 5241 of the outer periphery of the pin groove 524 is similar to... Figure 5 In addition to the annular portion shown, the chamfered feature structure 5241 also has a rectangular portion located near the left side of the retaining pin groove 524 (i.e., the side where the anvil 521 is widened). The widened anvil 521 and the chamfered feature structure 5241 with the rectangular portion can work together to improve the tolerance of the retaining pin orientation, facilitating the guidance of the retaining pin biased on the left side of the retaining pin groove 524 into the retaining pin groove 524.
[0076] Unless otherwise stated, Figures 2-5 The description of the embodiments shown also applies to... Figures 10-12H The implementation method will not be described in detail for the sake of simplicity.
[0077] The surgical stapler provided by this invention allows for minimal positional deviation during the firing of the retaining pin. 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 an additional area of the tissue contact surface of the anvil, without missing the anvil and entering the tissue. This additional area of the tissue contact surface can be formed by or supported by an extension of the cap. The retaining pin abuts against the enlarged tissue contact surface, thereby applying a distally resisting pushing force to the anvil. The movement of the anvil and staple cartridge toward the closed configuration is hindered, or the anvil and staple cartridge cannot be actuated to the closed configuration. This allows the operator to perceive any abnormality in the guide pin actuation. Furthermore, the retaining pin abutting against the tissue contact surface of the anvil can return to the retaining pin groove with subsequent slight shaking or similar operations, allowing for subsequent surgical procedures.
[0078] The scope of protection of this invention is defined only by the claims. The terms "various embodiments," "some embodiments," "one embodiment," or "embodiment" used in this specification mean that a specific feature, structure, or characteristic described in connection with an embodiment is 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. Furthermore, in one or more embodiments, specific features, structures, or characteristics can be combined in any suitable manner. Therefore, unless otherwise specified, a specific feature, structure, or characteristic shown or described in connection with one embodiment may be combined in whole or in part with features, structures, or characteristics of one or more other embodiments, and the resulting modifications and variations also fall within the scope of this invention.
Claims
1. A surgical suture device (100) comprising a handle assembly (20) for an operator to hold and an end effector (30) located distal to the handle assembly in a first direction (D1), the end effector 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 in the first direction between an open configuration and a closed configuration, the anvil portion (32) being formed as an elongated strip extending in a second direction (D2) perpendicular to the first direction (D1), wherein: The surgical stapler is configured to fire surgical staples from the staple cartridge toward the anvil (32); The anvil portion (32) has a screeding groove (323) for receiving and shaping the surgical staples and a retaining pin groove (324) for receiving retaining pins disposed on the staple cartridge in its proximal tissue contact surface. The anvil portion (32) includes an anvil portion body and a cap portion (322) located at the end of the anvil portion body. The pin-forming groove (323) has a center line (X) extending along the second direction, the retaining pin groove (324) is offset to one side relative to the center line, and the cap (322) has an extension section (3221) extending along the side wall of the anvil body on the side of the anvil body.
2. The surgical suture device according to claim 1, characterized in that, The dimension (S4) of the extended section of the cap in the second direction is greater than or equal to 5.3 mm.
3. The surgical suture device according to claim 2, characterized in that, The dimension (S4) of the extended section of the cap in the second direction is 5.3mm-5.9mm.
4. The surgical suture device 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 suture device according to claim 4, characterized in that, The maximum width (S3) of the tissue contact surface is 7.0 mm to 8.0 mm.
6. The surgical suture device according to claim 1, characterized in that, The cap portion (322) includes a cap portion body (3222) located on one side of the anvil portion body in the second direction, the cap portion body having a width that tapers away from the snagging groove, and the size of the cap portion body in the first direction also tapers away from the snagging groove.
7. The surgical suture device according to claim 1, characterized in that, The anvil portion (32) includes a support member, which includes a support body installed within the main body of the anvil portion and the exposed cap portion (322), wherein the support member is made of plastic and the portion of the anvil portion other than the support member is made of stainless steel.
8. The surgical suture device according to claim 1, characterized in that, A trigger for operably firing the surgical nail is disposed on the shank assembly (20), and a retaining pin operating component for operably firing the retaining pin is disposed on the end actuator (30).
9. The surgical suture device according to claim 1, characterized in that, The retaining pin groove is surrounded by a chamfered feature structure for guiding the retaining pin into the retaining pin groove.
10. The surgical suture device according to claim 9, characterized in that, The chamfered feature includes a continuous annular portion surrounding the retaining pin groove.
11. The surgical suture device according to claim 9, characterized in that, The chamfered feature includes a rectangular portion located only on one side of the retaining pin groove.
12. The surgical suture device according to claim 1, characterized in that, The extension section (3221) and the surface of the anvil body facing the staple cartridge together constitute the tissue contact surface.
13. The surgical suture device according to any one of claims 1-12, characterized in that, The extension section (3221) and the anvil body have the same dimensions in the first direction, and the respective surfaces of the extension section (3221) and the anvil body facing the staple cartridge are flush.
14. The surgical suture device according to claim 13, characterized in that, The cap (322) includes a cap body (3222) located on one side of the anvil body in the second direction (D2), and the outer surface (3221a) of the extension segment (3221) which is generally perpendicular to the third direction is formed as an arcuate surface that gradually approaches the sidewall of the anvil body in a direction away from the cap body and terminates at the sidewall of the anvil body.
15. The surgical suture device according to any one of claims 1-12, characterized in that, The surface of the extension section (4221) and the surface facing the staple cartridge are further away from the staple cartridge than the surface of the anvil body and the surface facing the staple cartridge.
16. The surgical suture device according to claim 15, characterized in that, The extension section (4221) is a flat plate structure with uniform width.
17. The surgical suture device according to any one of claims 1-11, characterized in that, The anvil body includes an anvil (521) having the staple-forming groove, the anvil (521) having a portion extending in a third direction (D3) to cover the surface of the extension section (5221) facing the staple cartridge, such that the tissue contact surface is completely defined by the anvil (521).
18. The surgical suture device according to claim 17, characterized in that, The cap (522) includes a cap body (5222) located on one side of the anvil body in the second direction (D2), and the outer surface of the extension segment (5221) which is generally perpendicular to the third direction is formed as an arcuate surface that gradually approaches the sidewall of the anvil body in a direction away from the cap body and terminates at the sidewall of the anvil body.
19. The surgical suture device according to claim 18, characterized in that, The surface of the cap body (5222) facing the nail cartridge at the junction with the anvil (521) is flush with the surface of the anvil (521) facing the nail cartridge.