Surgical anastomosis instrument

Abstract

The invention relates to the technical field of medical instruments, and discloses a surgical anastomosis instrument which comprises an anvil block and a nail bin capable of moving between an opening position and a closing position relative to the anvil block. Wherein the cartridge includes a first inner surface defining a first longitudinal axis, a distal surface connected to the first inner surface and offset from the first longitudinal axis, and a first engagement portion disposed on a first interface between the distal surface and the first inner surface; the anvil includes a second inner surface defining a second longitudinal axis, a distal tip connected to the second inner surface, and a second engagement portion disposed on a second interface between the distal tip and the second inner surface. The distal tip is disposed on, or offset from, the second longitudinal axis; when the staple cartridge is in the closed position, the first joint part is jointed with the second joint part, so that the staple cartridge is aligned with the anvil block, dislocation of the first inner surface and the second inner surface is avoided, and the expected suturing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a surgical anastomosis instrument. Background Art

[0002] An anastomotic device used in surgical procedures is a device that simultaneously closes a patient's wound and removes excess tissue. It is widely used for tissue removal and anastomosis in minimally invasive procedures such as abdominal surgery, gynecology, pediatrics, and thoracic surgery. The anastomotic device enters the human body through a cannula precisely positioned at the surgical site. It then creates a longitudinal incision in the tissue and applies staples on opposite sides of the incision, thereby separating and anastomosing the tissue, similar to a stapler.

[0003] Typically, a stapler includes an actuator, which includes an anvil and a staple magazine. The staple magazine is used to install staples and the staples are arranged toward the anvil. The staple magazine can rotate relative to the anvil to clamp the tissue between the staple magazine and the anvil for suturing. Depending on different needs, typical actuator lengths are 30mm, 45mm, and 60mm. In other designs, the actuator length can also be 80mm, 100mm, or other larger sizes. The longer the actuator is, the more likely it is that spatial misalignment will occur after closing, especially at the distal end of the actuator. The misalignment parallel to the tissue contact surface causes the staple hole and the staple groove to not be properly aligned, which further causes the staple to not be properly formed and the expected effect cannot be achieved. In view of this, it is indeed necessary to propose a surgical stapling instrument to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a surgical anastomosis instrument to solve the technical problem in the related art that the nail hole and the nail groove cannot be correctly aligned, resulting in the suture nail not being correctly formed and the expected effect cannot be achieved.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A surgical stapling instrument comprises: an anvil and a staple cartridge movable relative to the anvil between an open position and a closed position;

[0007] The staple cartridge comprises: a first inner surface defining a first longitudinal axis, a distal surface connected to the first inner surface and offset from the first longitudinal axis, and a first engagement portion disposed on a first interface between the distal surface and the first inner surface;

[0008] The anvil includes: a second inner surface defining a second longitudinal axis, a distal tip connected to the second inner surface, and a second engagement portion disposed at a second interface between the distal tip and the second inner surface;

[0009] The distal tip is disposed on or offset from the second longitudinal axis; when the staple cartridge is in the closed position, the first engaging portion engages with the second engaging portion to align the staple cartridge with the anvil.

[0010] Beneficial effects of the present invention:

[0011] The surgical stapling instrument proposed in the present invention includes an anvil and a nail magazine capable of moving between an open position and a closed position relative to the anvil, the nail magazine including a first inner surface defining a first longitudinal axis, a distal surface connected to the first inner surface and deviating from the first longitudinal axis, and a first engaging portion arranged on a first junction between the distal surface and the first inner surface; the anvil includes a second inner surface defining a second longitudinal axis, a distal end connected to the second inner surface, and a second engaging portion arranged on a second junction between the distal end and the second inner surface, the distal end being arranged on the second longitudinal axis, or deviating from the second longitudinal axis, when the nail magazine is in the closed position, the first engaging portion engages with the second engaging portion to align the nail magazine with the anvil, avoiding misalignment of the first inner surface and the second inner surface, thereby achieving the expected suturing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the surgical anastomosis instrument provided by the present invention;

[0013] Figure 2 is an axonometric diagram of the actuator provided by the present invention;

[0014] Figure 3 is an axonometric view of the actuator provided by the present invention from another angle;

[0015] Figure 4 is a side view of the actuator provided by the present invention;

[0016] Figure 5 is a side cross-sectional view of the distal end of the actuator provided by the present invention;

[0017] Figure 6A yes Figure 5 A transverse cross-sectional view of the distal end of an actuator along line DD is provided;

[0018] Figure 6B yes Figure 5 Another transverse cross-sectional view of the distal end of the actuator along line DD is provided;

[0019] Figure 7 is a schematic diagram of an embodiment of an anvil provided by the present invention;

[0020] Figure 8 This is a partial view of the distal end of an actuator provided by the present invention;

[0021] Figure 9 It is a partial view of the distal end of another actuator provided by the present invention.

[0022] In the picture:

[0023] 10. Surgical stapling instrument; 11. Controller; 20. Instrument body rod; 30. Actuator;

[0024] 31. Nail cartridge; 311. First inner surface; 312. First longitudinal slot; 313. Nail cavity; 314. First engaging portion; 314a. Rectangular raised portion; 314b. Trapezoidal raised portion; 315. Distal surface;

[0025] 32. Anvil; 321. Second inner surface; 322. Second longitudinal slot; 323. Nail groove; 324. Second engaging portion; 324a. Rectangular recess; 324b. Trapezoidal recess; 325. Distal end; 326. Tissue retaining portion; 326a. First protrusion; 326b. Second protrusion; 3261. Third inner surface; 3262. Fourth inner surface;

[0026] 33. Rotating shaft;

[0027] 34. Drive components. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0029] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0032] like Figure 1 As shown, this embodiment provides a surgical stapling instrument 10, which includes a controller 11, a body rod 20 extending distally from the controller 11, and an actuator 30 located at the distal end of the body rod 20. The controller 11 can be driven by a motor or manually to control the actuator 30 to clamp and sew tissue. Similar technologies are publicly available and disclosed in multiple inventions, and will not be described in detail here.

[0033] The actuator 30 includes a pair of correspondingly arranged jaws, which are respectively configured as a nail magazine 31 and an anvil 32. Figure 2-Figure 4 The proximal end of the nail magazine 31 and the proximal end of the anvil 32 are connected by a rotating shaft 33, and the two can be switched between open and closed under the action of the drive assembly 34.

[0034] The staple cartridge 31 includes a first inner surface 311 defining a first longitudinal axis, and the anvil 32 includes a second inner surface 321 defining a second longitudinal axis. The first inner surface 311 and the second inner surface 321 are disposed opposite to each other.

[0035] When the actuator 30 is open, the first inner surface 311 and the second inner surface 321 form an angle, and their farthest ends are far away from each other; when the actuator 30 is closed, the first inner surface 311 and the second inner surface 321 are roughly parallel, and their farthest ends are close to each other.

[0036] The nail magazine 31 includes a first longitudinal slot 312, and on both sides of the first longitudinal slot 312, at least two rows of staggered nail cavities 313 are respectively provided on the first inner surface 311, and the nail cavities 313 contain suture nails; the anvil 32 includes a second longitudinal slot 322, and on both sides of the second longitudinal slot 322, nail grooves 323 corresponding to the nail cavities 313 are respectively provided on the second inner surface 321.

[0037] During operation, the drive assembly 34 passes through the first longitudinal slot 312 to push the suture staples in the staple cartridge 31 out, so that the suture staples are formed in the staple slots 323 of the anvil 32 .

[0038] Depending on different needs, the length of the actuator 30 is typically 30 mm, 45 mm, or 60 mm. In other designs, the length of the actuator 30 can also be 80 mm, 100 mm, or other sizes. It is easy to understand that the longer the actuator 30 is, the more likely it is that spatial misalignment will occur after closing, especially at the distal end of the actuator 30. In particular, the misalignment between the first inner surface 311 and the second inner surface 321 will cause the staple cavity 313 and the staple groove 323 to be misaligned, further resulting in the staple not being properly formed and failing to achieve the desired effect.

[0039] In order to solve the above problems, Figure 2-6B As shown, the surgical stapling instrument 10 includes an anvil 32 and a nail magazine 31 capable of moving between an open position and a closed position relative to the anvil 32; wherein, the nail magazine 31 includes a first inner surface 311 defining a first longitudinal axis, a distal surface 315 connected to the first inner surface 311 and offset from the first longitudinal axis, and a first engaging portion 314 arranged on a first junction between the distal surface 315 and the first inner surface 311; the anvil 32 includes a second inner surface 321 defining a second longitudinal axis, a distal end 325 connected to the second inner surface 321, and a second engaging portion 324 arranged on a second junction between the distal end 325 and the second inner surface 321; the distal end 325 is arranged on the second longitudinal axis, or offset from the second longitudinal axis; when the nail magazine 31 is in the closed position, the first engaging portion 314 engages with the second engaging portion 324 to align the nail magazine 31 with the anvil 32.

[0040] The surgical stapling instrument 10 can align the anvil 32 and the staple cartridge 31 by engaging the first engaging portion 314 and the second engaging portion 324 , thereby avoiding misalignment of the first inner surface 311 and the second inner surface 321 , thereby achieving a desired suturing effect.

[0041] In some embodiments, as Figure 6AAs shown, the first engaging portion 314 includes a rectangular protrusion 314a and a trapezoidal protrusion 314b located on the rectangular protrusion 314a, and the second engaging portion 324 includes a rectangular recessed portion 324a. The transverse width of the trapezoidal protrusion 314b is smaller than the transverse width of the rectangular recessed portion 324a, so that the trapezoidal protrusion 314b is conveniently inserted into the rectangular recessed portion 324a; the transverse width of the rectangular protrusion 314a is adapted to the transverse width of the rectangular recessed portion 324a, that is, the rectangular protrusion 314a is adapted to the transverse width of the rectangular recessed portion 324a, that is, the rectangular protrusion 314a is adapted to the transverse width of the rectangular recessed portion 324a, that is, the rectangular protrusion 314b ... The lateral width of the trapezoidal protrusion 314a is basically equal to the lateral width of the rectangular recess 324a, so as to limit the first joint portion 314. After the rectangular protrusion 314a is inserted into the rectangular recess 324a, the side wall of the rectangular protrusion 314a can contact the side wall of the rectangular recess 324a, thereby preventing the trapezoidal protrusion 314b from moving freely in the rectangular recess 324a, and can play a corrective role when misalignment occurs during the closing process of the nail magazine 31 and the anvil 32.

[0042] In other embodiments, Figure 6B As shown, the first joining portion 314 includes a rectangular protrusion 314a, and the second joining portion 324 includes a rectangular recess 324a and a trapezoidal recess 324b located on the rectangular recess 324a. The lateral width of the rectangular protrusion 314a is smaller than the lateral width of the trapezoidal recess 324b, and the lateral width of the rectangular protrusion 314a is adapted to the lateral width of the rectangular recess 324a, that is, the lateral width of the rectangular protrusion 314a is basically equal to the lateral width of the rectangular recess 324a. The lateral width of the rectangular protrusion 314a is smaller than the lateral width of the trapezoidal recess 324b, so that the rectangular protrusion 314a can extend into the rectangular recess 324a through the trapezoidal recess 324b. The lateral width of the rectangular protrusion 314a is basically equal to the lateral width of the rectangular recess 324a, so as to limit the first joint 314. After the rectangular protrusion 314a is inserted into the rectangular recess 324a, the side wall of the rectangular protrusion 314a can contact the side wall of the rectangular recess 324a, so as to prevent the rectangular protrusion 314a from moving freely in the rectangular recess 324a, and can play a corrective role when misalignment occurs during the closing process of the nail magazine 31 and the anvil 32.

[0043] In some embodiments, the width of the anvil 32 decreases from the proximal end to the distal end. This arrangement facilitates passing through narrow areas in the tissue, such as free vascular structures.

[0044] In some embodiments, as Figure 8 As shown, the distal surface 315 and the first inner surface 311 define a fourth angle θ, and the distal end 325 and the second inner surface 321 define a fifth angle α, which is between 90° and 180° and greater than the fourth angle θ, so that the nail magazine 31 and the anvil 32 can be closed.

[0045] In some embodiments, as Figure 7 and Figure 9 As shown, the anvil 32 also includes a tissue limiting portion 326 protruding from the second junction portion. The tissue limiting portion 326 can enter the gap between tissues, stretch the tissue in the gap, and limit the tissue from falling out through the gap; especially when the instrument moves, it limits the tissue from falling out to a certain extent.

[0046] In some embodiments, when the staple cartridge 31 is in the closed position, the tissue stop 326 is separated from the distal surface 315 or the first inner surface 311 to enable the staple cartridge 31 and the anvil 32 to be closed.

[0047] In some embodiments, the first engaging portion 314 is convex on the first junction portion, the second engaging portion 324 is concave on the second junction portion, and the first engaging portion 314 or the second engaging portion 324 is laterally offset from the tissue limiting portion 326. The structure of the first engaging portion 314 and the second engaging portion 324 is simple, and the first engaging portion 314 or the second engaging portion 324 is laterally offset from the tissue limiting portion 326 to prevent the tissue limiting portion 326 from interfering with the engagement of the first engaging portion 314 and the second engaging portion 324, thereby enabling the staple cartridge 31 and the anvil 32 to be closed.

[0048] like Figure 7 As shown, the tissue stopper 326 includes a first protrusion 326a and a second protrusion 326b that are spaced apart, and the first engaging portion 314 and the second engaging portion 324 can engage between the first protrusion 326a and the second protrusion 326b. The first protrusion 326a and the second protrusion 326b laterally limit the position of the first engaging portion 314, so that the first engaging portion 314 and the second engaging portion 324 can engage between the first protrusion 326a and the second protrusion 326b.

[0049] In some embodiments, the tissue limiting portion 326 includes a third inner surface 3261 and a fourth inner surface 3262 that are interconnected and define a first angle. The first angle is between 0° and 225°, thereby preventing sharp angles from damaging tissue.

[0050] In some embodiments, the third inner surface 3261 is connected to the distal end 325 and defines a second angle, and the fourth inner surface 3262 is connected to the second inner surface 321 and defines a third angle β, and the second angle or the third angle β is between 135° and 160°. The above setting is conducive to entering the gaps between tissues and passing through the gaps.

[0051] In some embodiments, the distal surface 315 and the first inner surface 311 define a fourth angle θ, and the distal end 325 and the second inner surface 321 define a fifth angle α, which is between 90° and 180° and greater than the fourth angle θ, so that the nail magazine 31 and the anvil 32 can be closed.

[0052] like Figure 1 As shown, this embodiment provides a surgical stapling instrument 10, which includes a controller 11, a body rod 20 extending distally from the controller 11, and an actuator 30 located at the distal end of the body rod 20. The controller 11 can be driven by a motor or manually to control the actuator 30 to clamp and sew tissue. Similar technologies are publicly available and disclosed in multiple inventions, and will not be described in detail here.

[0053] The actuator 30 includes a pair of correspondingly arranged jaws, each configured as a staple cartridge 31 and an anvil 32. In this embodiment, the anvil 32 is fixed, and the staple cartridge 31 is movable relative to the anvil 32 between an open position and a closed position. In other embodiments, the staple cartridge 31 may be relatively fixed, and the anvil 32 may be movable relative to the staple cartridge 31 between an open and closed position.

[0054] refer to Figure 2-Figure 4 The proximal end of the nail magazine 31 and the proximal end of the anvil 32 are connected by a rotating shaft 33, and the two can be switched between open and closed under the action of the drive assembly 34.

[0055] The staple cartridge 31 includes a first inner surface 311 defining a first longitudinal axis, and the anvil 32 includes a second inner surface 321 defining a second longitudinal axis. The first inner surface 311 and the second inner surface 321 are disposed opposite each other. When the actuator 30 is open, the first inner surface 311 and the second inner surface 321 are angled, with their distal ends facing away from each other. When the actuator 30 is closed, the first inner surface 311 and the second inner surface 321 are substantially parallel, with their distal ends approaching each other.

[0056] The nail magazine 31 includes a first longitudinal slot 312, and on both sides of the first longitudinal slot 312, at least two rows of staggered nail cavities 313 are respectively provided on the first inner surface 311, and the nail cavities 313 contain suture nails; the anvil 32 includes a second longitudinal slot 322, and on both sides of the second longitudinal slot 322, nail grooves 323 corresponding to the nail cavities 313 are respectively provided on the second inner surface 321.

[0057] During operation, the user operates the controller 11 to close the jaws to clamp the target tissue, and then uses the drive assembly 34 to push out the multiple rows of suture staples in the staple cartridge 31 and form them in the staple grooves 323 of the anvil 32 to suture the tissue. In some surgical stapling instruments 10, a cutting knife is also installed to cut the sutured tissue between the multiple rows of staples.

[0058] Depending on different needs, the length of the actuator 30 is typically 30 mm, 45 mm, or 60 mm. In other designs, the length of the actuator 30 can also be 80 mm, 100 mm, or other sizes. It is easy to understand that the longer the actuator 30 is, the more likely it is that spatial misalignment will occur after closing, especially at the distal end of the actuator 30. In particular, the misalignment between the first inner surface 311 and the second inner surface 321 will cause the staple cavity 313 and the staple groove 323 to be misaligned, further resulting in the staple not being properly formed and failing to achieve the desired effect.

[0059] In order to solve the above problems, the nail magazine 31 includes a first inner surface 311 defining a first longitudinal axis, a distal surface 315 connected to the first inner surface 311 and deviated from the first longitudinal axis, and a first coupling portion 314 arranged on the first junction between the distal surface 315 and the first inner surface 311; the anvil 32 includes a second inner surface 321 defining a second longitudinal axis, a distal end 325 connected to the second inner surface 321, and a second coupling portion 324 arranged on the second junction between the distal end 325 and the second inner surface 321; the distal end 325 is arranged on the second longitudinal axis, or deviated from the second longitudinal axis; when the nail magazine 31 is in a closed position, the first coupling portion 314 engages with the second coupling portion 324.

[0060] In order to ensure that the nail cavity 313 is aligned with the nail groove 323, the surgical stapling instrument 10 is connected by the first connecting portion 314 and the second connecting portion 324, so as to align the anvil 32 and the nail magazine 31 to avoid misalignment of the first inner surface 311 and the second inner surface 321, thereby achieving the expected suturing effect.

[0061] In some embodiments, as Figure 6A As shown, the first engaging portion 314 includes a rectangular protrusion 314a and a trapezoidal protrusion 314b located on the rectangular protrusion 314a, and the second engaging portion 324 includes a rectangular recessed portion 324a. The transverse width of the trapezoidal protrusion 314b is smaller than the transverse width of the rectangular recessed portion 324a, so that the trapezoidal protrusion 314b is conveniently inserted into the rectangular recessed portion 324a; the transverse width of the rectangular protrusion 314a is adapted to the transverse width of the rectangular recessed portion 324a, that is, the rectangular protrusion 314a is adapted to the transverse width of the rectangular recessed portion 324a, that is, the rectangular protrusion 314a is adapted to the transverse width of the rectangular recessed portion 324a, that is, the rectangular protrusion 314b ... The lateral width of the trapezoidal protrusion 314a is basically equal to the lateral width of the rectangular recess 324a, so as to limit the first joint portion 314. After the rectangular protrusion 314a is inserted into the rectangular recess 324a, the side wall of the rectangular protrusion 314a can contact the side wall of the rectangular recess 324a, thereby preventing the trapezoidal protrusion 314b from moving freely in the rectangular recess 324a, and can play a corrective role when misalignment occurs during the closing process of the nail magazine 31 and the anvil 32.

[0062] In other embodiments, Figure 6BAs shown, the first joining portion 314 includes a rectangular protrusion 314a, and the second joining portion 324 includes a rectangular recess 324a and a trapezoidal recess 324b located on the rectangular recess 324a. The lateral width of the rectangular protrusion 314a is smaller than the lateral width of the trapezoidal recess 324b, and the lateral width of the rectangular protrusion 314a is adapted to the lateral width of the rectangular recess 324a, that is, the lateral width of the rectangular protrusion 314a is basically equal to the lateral width of the rectangular recess 324a. The lateral width of the rectangular protrusion 314a is smaller than the lateral width of the trapezoidal recess 324b, so that the rectangular protrusion 314a can extend into the rectangular recess 324a through the trapezoidal recess 324b. The lateral width of the rectangular protrusion 314a is basically equal to the lateral width of the rectangular recess 324a, so as to limit the first joint 314. After the rectangular protrusion 314a is inserted into the rectangular recess 324a, the side wall of the rectangular protrusion 314a can contact the side wall of the rectangular recess 324a, so as to prevent the rectangular protrusion 314a from moving freely in the rectangular recess 324a, and can play a corrective role when misalignment occurs during the closing process of the nail magazine 31 and the anvil 32.

[0063] In this embodiment, two rows of staggered staple cavities 313 are provided on both sides of the first longitudinal slot 312 of the staple cartridge 31, and two rows of staple grooves 323 corresponding to the staple cavities 313 are provided on both sides of the second longitudinal slot 322 of the anvil 32. The design of two rows of staple lines can significantly reduce the outer dimensions of the actuator 30, especially the width of the actuator 30. Specifically, Figure 7 An embodiment of anvil 32 is shown. Anvil 32 has a first width W1 at its proximal end, a second width W2 at its midsection, and a third width W3 at its distal end. The widths of anvil 32 decrease progressively from the proximal end to the distal end. In other words, first width W1 is greater than second width W2, which in turn is greater than third width W3. The transitions between the three widths are connected by flat or curved surfaces, ensuring continuity and avoiding sharp corners that could damage patient tissue.

[0064] Optionally, the distal end of the anvil 32 is configured to have a wedge-shaped distal tip 325 to facilitate passage of the anvil 32 through narrow tissue locations, such as free vascular structures. Generally, the distal end of the distal tip 325 is longer than the distal end of the staple cartridge 31. As will be readily understood, the width of the wedge-shaped distal tip 325 gradually decreases from the proximal end to the distal end of the distal tip 325. The distal end of the distal tip 325 is configured to have an arc shape to enhance guidance and prevent injury to the patient.

[0065] In one embodiment, Figure 8As shown, the distal end 325 is configured to have a curved shape, and the distal end 325 is bent toward the direction of the nail magazine 31. The distal end 325 can be integrally configured with the anvil 32, or fixedly connected to the anvil 32 by welding, bonding, or the like.

[0066] In some embodiments, as Figure 8 As shown, the distal surface 315 and the first inner surface 311 define a fourth angle θ, and the distal end 325 and the second inner surface 321 define a fifth angle α, which is between 90° and 180° and greater than the fourth angle θ, so that the nail magazine 31 and the anvil 32 can be closed.

[0067] like Figure 9 As shown, the anvil 32 further includes a tissue stopper 326 protruding from the second interface portion. The tissue stopper 326 can enter the gap between tissues, stretch the tissue in the gap, and limit tissue from coming out through the gap; in particular, when the instrument moves, it limits tissue from coming out to a certain extent.

[0068] Optionally, when the staple cartridge 31 is in the closed position, the tissue stop 326 is separated from the distal surface 315 or the first inner surface 311 so that the staple cartridge 31 and the anvil 32 can be closed.

[0069] Optionally, the first engaging portion 314 is convex on the first junction portion, the second engaging portion 324 is concave on the second junction portion, and the first engaging portion 314 or the second engaging portion 324 is laterally offset from the tissue limiting portion 326. The structure of the first engaging portion 314 and the second engaging portion 324 is simple, and the first engaging portion 314 or the second engaging portion 324 is laterally offset from the tissue limiting portion 326 to prevent the tissue limiting portion 326 from interfering with the engagement of the first engaging portion 314 and the second engaging portion 324, thereby enabling the staple cartridge 31 and the anvil 32 to be closed.

[0070] like Figure 7 As shown, the tissue stopper 326 includes a first protrusion 326a and a second protrusion 326b that are spaced apart, and the first engaging portion 314 and the second engaging portion 324 can engage between the first protrusion 326a and the second protrusion 326b. The first protrusion 326a and the second protrusion 326b laterally limit the position of the first engaging portion 314, so that the first engaging portion 314 and the second engaging portion 324 can engage between the first protrusion 326a and the second protrusion 326b.

[0071] Optionally, the tissue limiting portion 326 includes a third inner surface 3261 and a fourth inner surface 3262 that are interconnected and define a first angle, and the first angle is between 0° and 225°, thereby preventing sharp angles from damaging tissue.

[0072] Optionally, the third inner surface 3261 is connected to the distal end 325 and defines a second angle, and the fourth inner surface 3262 is connected to the second inner surface 321 and defines a third angle β, and the second angle or the third angle β is between 135° and 160°. The above setting is conducive to entering the gaps between tissues and passing through the gaps.

[0073] Optionally, the distal surface 315 and the first inner surface 311 define a fourth angle θ, and the distal end 325 and the second inner surface 321 define a fifth angle α, and the fifth angle α is between 90° and 180° and is greater than the fourth angle θ, so that the nail magazine 31 and the anvil 32 can be closed. When the actuator 30 is closed, the gap between the distal surface 315 and the distal end 325 expands from the proximal end to the distal end.

[0074] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A surgical anastomosis instrument, characterized in that: include: an anvil (32) and a staple cartridge (31) movable between an open position and a closed position relative to the anvil (32); The nail magazine (31) includes: a first inner surface (311) defining a first longitudinal axis, a distal surface (315) connected to the first inner surface (311) and deviated from the first longitudinal axis, and a first engaging portion (314) provided on a first interface between the distal surface (315) and the first inner surface (311); The anvil (32) includes: a second inner surface (321) defining a second longitudinal axis, a distal end (325) connected to the second inner surface (321), and a second engagement portion (324) disposed on a second interface between the distal end (325) and the second inner surface (321); The distal end (325) is arranged on the second longitudinal axis or offset from the second longitudinal axis; when the nail magazine (31) is in the closed position, the first engaging portion (314) engages with the second engaging portion (324) to align the nail magazine (31) with the anvil (32).

2. The surgical anastomosis instrument according to claim 1, characterized in that: The first joining portion (314) includes a rectangular protrusion (314a) and a trapezoidal protrusion (314b) located on the rectangular protrusion (314a); the second joining portion (324) includes a rectangular recessed portion (324a); the lateral width of the trapezoidal protrusion (314b) is smaller than the lateral width of the rectangular recessed portion (324a); and the lateral width of the rectangular protrusion (314a) is adapted to the lateral width of the rectangular recessed portion (324a).

3. The surgical stapling instrument according to claim 1, wherein: The first engaging portion (314) includes a rectangular protrusion (314a), and the second engaging portion (324) includes a rectangular recess (324a) and a trapezoidal recess (324b) located on the rectangular recess (324a). The transverse width of the rectangular protrusion (314a) is smaller than the transverse width of the trapezoidal recess (324b) and matches the transverse width of the rectangular recess (324a).

4. The surgical anastomosis instrument according to claim 1, characterized in that: The anvil (32) further includes a tissue stop (326) protruding from the second interface portion.

5. The surgical anastomosis instrument according to claim 4, characterized in that: When the staple cartridge (31) is in the closed position, the tissue limiting portion (326) is separated from the distal surface (315) or the first inner surface (311).

6. The surgical anastomosis instrument according to claim 4, characterized in that: The first engaging portion (314) is convex on the first boundary portion, the second engaging portion (324) is concave on the second boundary portion, and the first engaging portion (314) or the second engaging portion (324) deviates laterally from the tissue limiting portion (326).

7. The surgical stapling instrument according to claim 6, characterized in that: The tissue limiting portion (326) includes a first protrusion (326a) and a second protrusion (326b) that are spaced apart, and the first engaging portion (314) and the second engaging portion (324) are capable of engaging between the first protrusion (326a) and the second protrusion (326b).

8. The surgical anastomosis instrument according to claim 4, characterized in that: The tissue limiting portion (326) includes a third inner surface (3261) and a fourth inner surface (3262) connected to each other and defining a first angle, wherein the first angle is between 200° and 225°.

9. The surgical stapling instrument according to claim 8, characterized in that: The third inner surface (3261) is connected to the distal end (325) and defines a second angle, and the fourth inner surface (3262) is connected to the second inner surface (321) and defines a third angle, and the second angle or the third angle is between 135° and 160°.

10. The surgical stapling instrument according to claim 1, characterized in that: The distal surface (315) defines a fourth angle with the first inner surface (311), and the distal tip (325) defines a fifth angle with the second inner surface (321), wherein the fifth angle is between 90° and 180° and is greater than the fourth angle.

11. The surgical stapling instrument according to claim 1, characterized in that: The width of the anvil (32) decreases from the proximal end to the distal end.

12. The surgical stapling instrument according to claim 1, wherein: The nail magazine (31) further comprises a first longitudinal slot (312) and at least two rows of nail cavities (313) located on either side of the first longitudinal slot (312).

Images