Staple head and surgical stapler

Abstract

The present disclosure provides a staple head and a surgical anastomotic instrument. The staple head includes first and second clamps arranged opposite each other, a connecting member connected to the proximal sides of the first and second clamps, a stopper rotatably attached to the connecting member and including a first stopper portion, and a trigger mechanism movable in the axial direction of the anastomotic instrument and including a second stopper portion. When the stopper is in a first state, the first stopper portion is located on the path of distal movement of the second stopper portion, effectively preventing erroneous triggering of the anastomotic instrument. When the stopper is rotated in a first direction relative to the connecting member under external force, moving the first stopper portion away from the axial center of the anastomotic instrument, the stopper transitions to a second state, and the first stopper portion is located away from the path of distal movement of the second stopper portion, allowing the anastomotic instrument to be triggered normally.

Description

[Technical Field]

[0001] The present invention relates to the technical field of medical devices, and more particularly to staple heads and surgical staplers. [Background technology]

[0002] In the prior art, a surgical stapler includes an anastomosis instrument body, an operating handle movably connected to the anastomosis instrument body, and a staple head portion engaged with the body. A transmission mechanism is provided inside the anastomosis instrument body. The staple head portion includes a staple cartridge assembly and a staple anvil assembly provided opposite each other, and a cutter movable within the staple head portion, and a trigger block is provided inside the staple cartridge assembly. During surgery, tissue is placed between the staple anvil assembly and the staple cartridge assembly, and the tissue is gradually clamped by adjusting the distance between the staple anvil assembly and the staple cartridge assembly. Thereafter, the operating handle is gripped and the transmission mechanism is used to drive the cutter to move in a distal direction. The cutter drives the trigger block to move, pushing out anastomotic staples and forming them on the anvil, thereby cutting the tissue and achieving anastomosis and cutting of the tissue.

[0003] In conventional anastomotic instruments, after one trigger, all the anastomotic staples in the staple cartridge are stapled into the tissue, and the staple cartridge must be replaced in order to perform the next trigger. If the surgeon inexperienced or careless re-grasps the operating handle before replacing the staple cartridge, the transmission mechanism will drive the cutter to move distally again, resulting in the tissue being cut without being sutured, resulting in a failed surgery. Therefore, it is necessary to provide a structure that can prevent a second erroneous trigger when the staple cartridge is not replaced after the anastomotic instrument has been triggered once. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the problems in the prior art, the present disclosure aims to provide a staple head and a surgical anastomosis instrument, which when the stopper is transitioned to a first state, prevents the movement of the trigger mechanism in the distal direction, thereby effectively avoiding erroneous triggering of the anastomosis instrument, and when the stopper is transitioned to a second state, does not prevent the movement of the trigger mechanism, thereby allowing the anastomosis instrument to be triggered normally. [Means for solving the problem]

[0005] An embodiment of the present disclosure provides a staple head.

[0006] The staple head is a first clamp and a second clamp provided opposite to each other; a connecting member connected to the proximal side of the first clamp and the second clamp; a stopper rotatably attached to the connecting member and including a first stopper portion; and a trigger mechanism that is movable in the axial direction of the anastomosis instrument and includes a second stop portion; When the stopper is in a first state, the first stopper portion is located on the path of distal movement of the second stopper portion, and when the stopper receives an external force and rotates in a first direction relative to the connecting member, moving the first stopper portion in a direction away from the axis of the anastomosis device, the stopper transitions to a second state, and the first stopper portion moves away from the path of distal movement of the second stopper portion.

[0007] In some embodiments, the distal end of the connecting member is provided with an attachment portion for attaching the stopper, and when the first clamp and the second clamp are in an open state, at least a portion of the attachment portion is provided on the side of the second stopper portion away from the axial center of the anastomosis instrument, and there is a first axial distance between the first stopper portion and the second stopper portion.

[0008] In some embodiments, the stopper further includes a pivot portion, the pivot portion being rotatably attached to the attachment portion via a pin shaft, and when the stopper is in the first state, the first stopper portion protrudes further than the pivot portion in a direction toward the axis of the anastomotic apparatus.

[0009] In some embodiments, the staple head further includes a drive member, the drive member being provided on the first clamp and movable in the axial direction of the anastomosis instrument, and the first clamp being rotatable relative to the connecting member; When the drive member is positioned proximal to the first clamp and rotates until the first clamp is closed relative to the second clamp, the drive member abuts against the stopper and drives the stopper to transition from the first state to the second state.

[0010] In some embodiments, when the stopper transitions from the first state to the second state, the trigger mechanism moves a second distance in a distal direction, and the first distance is greater than or equal to the second distance.

[0011] In some embodiments, a first drive portion is provided on the proximal side of the drive member, and a second drive portion that engages with the first drive portion is provided on the side of the stopper facing the axis of the anastomosis instrument.

[0012] In some embodiments, the first drive portion and the second drive portion are provided with a first guide surface and a second guide surface on opposite sides, respectively.

[0013] In some embodiments, the first stopper portion and the second drive portion are integrally formed, and when the stopper is in the first state, the side of the first stopper portion facing the first clamp is the second guide surface.

[0014] In some embodiments, the trigger mechanism includes a cutter and a cutter push rod, the distal end of the cutter being provided with the second stop portion and the proximal end of the cutter being coupled to the cutter push rod.

[0015] In some embodiments, when the stopper is in the second state and the trigger mechanism moves distally, the stopper is maintained in the second state with at least a portion of the stopper abutting against a side surface of the cutter pusher bar.

[0016] In some embodiments, the staple head further comprises a resilient member configured to apply a biasing force to the stopper to rotate it in a second direction, the second direction being opposite to the first direction.

[0017] In some embodiments, the mounting portion has a mounting groove that opens in a direction toward the axial center of the anastomosis apparatus, and at least a portion of the stopper extends into the mounting groove.

[0018] In some embodiments, the elastic member is a torsion spring provided on the pin shaft, or a compression spring provided between the stopper and the inner wall of the mounting groove.

[0019] In some embodiments, the coupling member includes a first position limiting portion, and the mounting groove is provided with a second position limiting portion, and the first position limiting portion and the second position limiting portion engage to limit the rotation angle of the coupling member in the second direction; and / or The connecting member further includes a third position limiting portion, and the stopper includes a fourth position limiting portion, and the third position limiting portion and the fourth position limiting portion engage with each other to limit the rotation angle of the connecting member in the first direction.

[0020] In some embodiments, a compression spring passage is defined within the mounting groove, the compression spring is movably disposed within the compression spring passage, the compression spring passage is disposed perpendicular to a side wall of the trigger mechanism, and the axial width of the compression spring passage is greater than the axial width of the mounting groove.

[0021] Embodiments of the present disclosure further provide a surgical stapler, the surgical stapler including the staple head described above. [Effects of the Invention]

[0022] The staple head and surgical stapler according to the present disclosure have the following advantages:

[0023] According to the present disclosure, when the anastomosis instrument satisfies the triggering conditions, the stopper transitions to the second state and does not block movement of the trigger mechanism, and the trigger mechanism is driven to move in the distal direction, successfully triggering the anastomosis instrument; when triggering of the anastomosis instrument is complete, the stopper transitions to the first state, and engagement between the first stopper portion and the second stopper portion effectively blocks movement of the trigger mechanism in the distal direction, effectively avoiding a second erroneous triggering of the anastomosis instrument and effectively improving the surgical effect. [Brief explanation of the drawings]

[0024] To make other features, objects, and advantages of the present disclosure more apparent, non-limiting examples will be described in detail with reference to the following drawings. [Figure 1] FIG. 1 is a schematic view showing a staple head portion according to a first embodiment of the present disclosure engaged with a sleeve. [Figure 2] FIG. 1 is a schematic view showing a staple head portion according to a first embodiment of the present disclosure engaged with a sleeve. [Figure 3] 1 is a schematic view showing a staple head portion, with the staple anvil housing omitted, engaged with a sleeve according to the first embodiment of the present disclosure. FIG. [Figure 4] FIG. 2 is a top view of a staple head portion according to the first embodiment of the present disclosure. [Figure 5]FIG. 5 is a cross-sectional view taken along the line AA in FIG. [Figure 6] 10 is a schematic diagram showing a state in which a connecting member according to the first embodiment of the present disclosure is engaged with a stopper. FIG. [Figure 7] 10 is a schematic diagram showing a state in which a connecting member according to the first embodiment of the present disclosure is engaged with a stopper. FIG. [Figure 8] 3A and 3B are structural schematic diagrams of a stopper according to the first embodiment of the present disclosure. [Figure 9] 3A and 3B are structural schematic diagrams of a connecting member according to the first embodiment of the present disclosure. [Figure 10] FIG. 10 is a schematic diagram illustrating a stopper in a first state engaged with a trigger mechanism according to the first embodiment of the present disclosure. [Figure 11] FIG. 10 is a schematic diagram illustrating the stopper engaged with the cutter when in a first state according to the first embodiment of the present disclosure. [Figure 12] FIG. 10 is a schematic view showing the stopper engaging with the trigger mechanism after the anastomotic apparatus has been closed, according to the first embodiment of the present disclosure. [Figure 13] FIG. 2 is a structural schematic diagram of a driving member according to the first embodiment of the present disclosure. [Figure 14] FIG. 10 is a schematic diagram showing a state in which a drive member is engaged with a stopper according to the first embodiment of the present disclosure. [Figure 15] FIG. 10 is a schematic diagram illustrating the stopper engaged with the cutter when in a second state according to the first embodiment of the present disclosure. [Figure 16] FIG. 10 is a schematic diagram showing the stopper engaging with the trigger mechanism during triggering of the anastomotic apparatus in accordance with the first embodiment of the present disclosure. [Figure 17] FIG. 10 is a schematic diagram showing the stopper engaging with the trigger mechanism after triggering of the anastomotic apparatus has been completed, according to the first embodiment of the present disclosure. [Figure 18] FIG. 10 is a schematic diagram showing a state in which a stopper is engaged with a connecting member according to a second embodiment of the present disclosure. [Figure 19] FIG. 10 is a structural schematic diagram of a connecting member according to a second embodiment of the present disclosure. [Figure 20] FIG. 19 is a cross-sectional view taken along the line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments will be described more comprehensively with reference to the drawings. It should be noted that the embodiments may be implemented in various forms and are not limited to the embodiments described herein. On the contrary, providing these embodiments will make the present disclosure comprehensive and complete, and comprehensively convey the concept of the embodiments to those skilled in the art. In the drawings, the same reference numerals represent the same or similar structures, and therefore redundant description will be omitted. In the specification, "or" and "alternative" can also mean "and" or "or." Terms such as "above," "below," and "between" may be used herein to describe different exemplary configurations and elements of the present disclosure. However, these terms are used herein merely for convenience and are based on the orientation of examples shown in the drawings. Nothing herein requires a specific three-dimensional orientation of a structure to fall within the scope of the present disclosure. Although some configurations are referred to herein using terms such as "first" or "second," these terms are merely for the purpose of describing the configurations and are not intended to limit the number or importance of specific configurations.

[0026] The present disclosure provides a staple head for use in a surgical anastomosis instrument and a surgical anastomosis instrument including the same. The surgical anastomosis instrument includes an anastomosis instrument body, an operating handle, and a staple head provided at the distal end of the anastomosis instrument body. When a trigger condition of the anastomosis instrument is met, the trigger handle is gripped and a driving force is transmitted to the staple head via a transmission mechanism inside the anastomosis instrument body, causing the staple head to complete the tissue suturing and cutting operation. The staple head includes first and second clamps provided opposite each other, a connecting member, a stopper, and a trigger mechanism. The connecting member is connected to the proximal sides of the first and second clamps. The stopper is rotatably attached to the connecting member and includes a first stopper portion. The trigger mechanism is movable in the axial direction of the anastomosis instrument and includes a second stopper portion.

[0027] When the stopper is in the first state, the first stopper portion is located in the path of distal movement of the second stopper portion, blocking distal movement of the trigger mechanism and preventing the anastomotic apparatus from being triggered, effectively preventing erroneous triggering of the anastomotic apparatus. When the stopper is subjected to an external force and rotates in a first direction relative to the connecting member, moving the first stopper portion in a direction away from the axis of the anastomotic apparatus, the stopper transitions to the second state, and the first stopper portion moves away from the path of distal movement of the second stopper portion. In this case, the trigger mechanism can be driven to move in the distal direction, allowing the anastomotic apparatus to be normally triggered.

[0028] Hereinafter, the structure of the staple head according to each specific embodiment of the present disclosure will be described in detail with reference to the drawings, but each specific embodiment does not limit the scope of protection of the present disclosure.

[0029] 1 to 17 show the structure of a staple head according to a first embodiment of the present disclosure. As shown in FIGS. 1 to 5, the staple head includes first and second clamps arranged opposite each other and a connecting member, and the staple head is provided at the distal end of a sleeve 9 of the anastomosis instrument body. Jaws are formed between the first and second clamps, and the first and second clamps are normally in a relatively open or relatively closed state, with one clamp in a fixed state and the other clamp in a fixed state. In this embodiment, by way of example, the second clamp is a fixed clamp, the first clamp is movable, the first clamp is provided with a staple cartridge assembly 1, and the second clamp is provided with a staple anvil assembly 2. The staple cartridge assembly 1 includes a staple cartridge holder 12 and a staple cartridge 11 in which staples are housed. The staple anvil assembly 2 includes a staple anvil housing 22 and a staple anvil body 21. The staple cartridge assembly 1 and the staple anvil assembly 2 are connected at their proximal sides to the connecting member 3, and the staple cartridge assembly 1 is rotatable relative to the connecting member 3, whereby the staple cartridge assembly 1 has an open state and a closed state relative to the staple anvil assembly 2, i.e., the staple head portion has a jaw open state and a jaw closed state.

[0030] In this disclosure, the distal side and proximal side are defined relative to the operator, with the side closer to the operator being the proximal side and the side farther from the operator, i.e., the side closer to the surgical position, being the distal side. The direction along the axis of the anastomotic instrument is the axial direction, i.e., the direction from the distal side to the proximal side of the anastomotic instrument, or the direction from the proximal side to the distal side of the anastomotic instrument. The S1 direction in Figure 1 is the direction from the distal side to the proximal side of the anastomotic instrument, and the S1 direction or the direction opposite to the S1 direction is defined as the axial direction. The S3 direction in Figure 5 is the vertical direction, i.e., the height direction. The S2 direction in Figure 11 is the horizontal direction, i.e., the width direction. In Figure 1, the S0 direction is the direction of the axial center of the anastomotic instrument. For each component, the side closer to the axis of the anastomotic instrument is the inner side, and the side away from the axis of the anastomotic instrument is the outer side.

[0031] The staple head further includes a trigger mechanism, which includes a cutter 6 and a cutter pusher rod 7, the distal end of which is connected to the proximal side of the cutter 6, and the cutter pusher rod 7 is drivable to move the cutter 6 in the axial direction of the anastomosis instrument. The cutter 6 includes a first cross beam 61, a connecting portion 62, and a second cross beam 63, which are provided in this order from top to bottom, and the upper portion of the distal end of the connecting portion 62 is a cutting edge for cutting tissue. The connecting portion 62 is inserted into the first cutter guide groove 211 of the staple anvil body 21 and the second cutter guide groove 121 of the staple cartridge holder 12, respectively, and the first cross beam 61 and the second cross beam 63 engage with the staple anvil body 21 and the staple cartridge holder 12, respectively. As shown in FIG. 5 , the cutter 6 has three positions 6a, 6b, and 6c when located on the proximal side. When the staple cartridge assembly 1 is released relative to the staple anvil assembly 2, the cutter 6 is located at a proximal position 6a of the staple cartridge assembly 1. When the operating handle is grasped and the cutter 6 is driven to move distally to a position 6b, the staple cartridge assembly 1 is gradually closed relative to the staple anvil assembly 2. After the jaws of the staple head are closed, the cutter 6 is driven by the cutter push rod 7 and moves distally to the distal end of the staple cartridge assembly 1, completing the triggering of the anastomosis instrument.

[0032] As shown in FIGS. 6 to 11 , the staple head portion further includes a stopper 5, the stopper 5 including a first stopper portion 51, and a corresponding second stopper portion 621 is provided at the distal end of the cutter 6. An attachment portion 30 for attaching the stopper 5 is provided at the distal end of the connecting member 3. When the staple cartridge assembly 1 is opened relative to the staple anvil assembly 2, at least a portion of the attachment portion 30 is located on the side of the second stopper portion 621 away from the axis of the anastomotic instrument, and at least a portion of the attachment portion 30 is located on one lateral side of the second stopper portion 621. An attachment groove 31 that opens in a direction away from the axis of the anastomotic instrument is provided in the attachment portion 30, and at least a portion of the stopper 5 enters the attachment groove 31. A mounting hole 34 is provided inside the mounting portion 30, and a pivot portion 54 is provided on the stopper 5, and the pivot portion 54 is rotatably attached to the mounting hole 34 of the mounting portion 30 via a pin shaft 36.

[0033] The stopper 5 has a first state and a second state. Figures 10 and 11 show the engagement between the stopper 5 and the cutter 6 in the first state, and Figure 15 shows the engagement between the stopper 5 and the cutter 6 in the second state. As shown in Figures 10 and 11, when the stopper 5 is in the first state, the first stopper portion 51 is located in the path of distal movement of the second stopper portion 621, blocking the distal movement of the cutter 6. This prevents the anastomotic instrument from being triggered, effectively preventing erroneous triggering of the anastomotic instrument. As shown in Figure 15, when the stopper 5 receives an external force and rotates in a first direction relative to the connecting member 3, moving the first stopper portion 51 away from the axis of the anastomotic instrument, the stopper 5 transitions to the second state, and the first stopper portion 51 moves away from the path of distal movement of the second stopper portion 621. In this case, the cutter 6 can be driven to move in the distal direction, allowing the anastomotic instrument to be triggered normally. From the viewing angle of FIG. 11, the first direction is clockwise.

[0034] An elastic member is provided within the mounting groove 31. The elastic member is configured to apply a biasing force to the stopper 5 to rotate it in a second direction, which is opposite to the first direction and, from the perspective of FIG. 11 , is the counterclockwise direction. Therefore, when an external force to rotate the stopper 5 in the first direction is not applied to the stopper 5, the stopper 5 is maintained in the first state by the action of the elastic member. As shown in FIG. 6 , in this embodiment, the elastic member is a torsion spring 81 fitted onto the pin shaft 36. When the stopper 5 is rotated in the first direction by an external force and transitions to the second state, the torsion spring 81 is elastically deformed. When the external force on the stopper 5 is removed, the elastic restoring force of the torsion spring 81 causes the stopper 5 to rotate in the second direction and return from the second state to the first state.

[0035] As shown in FIGS. 7 to 10 , the connecting member 3 includes a first position limiting portion 32 and a third position limiting portion 33, and the stopper 5 is provided with a second position limiting portion 52 and a fourth position limiting portion 53. The positions of the second position limiting portion 52 and the fourth position limiting portion 53 are adapted to the first position limiting portion 32 and the third position limiting portion 33, respectively. The second position limiting portion 52 and the fourth position limiting portion 53 are located on both longitudinal sides of the pivoting portion 54, i.e., located above and below the pivoting portion 54, respectively. The second position limiting portion 52 protrudes in a direction away from the axis of the anastomotic apparatus beyond the pivoting portion 54. The second position limiting portion 52 serves to strengthen the structural strength of the entire stopper 5. The first position limiting portion 32 is a stepped portion that fits the shape of the second position limiting portion 52, and the extending direction of the upper surface of the stepped portion intersects with the extending direction of the third position limiting portion 33. The first position limiting portion 32 and the second position limiting portion 52 engage to limit the rotation angle of the connecting member 3 in the second direction. When the stopper 5 rotates in the second direction due to the action of the torsion spring 81, the first position limiting portion 32 limits the rotation stroke of the second position limiting portion 52, preventing the rotation angle of the stopper 5 from becoming too large. The fourth position limiting portion 53 is a side wall of the stopper 5 on the side away from the axial direction of the anastomotic instrument, and the third position limiting portion 33 is an inner wall of the mounting groove 31 on the side away from the axial direction of the anastomotic instrument. In this embodiment, the opposing surfaces of the first position limiting portion 32 and the second position limiting portion 52 are substantially perpendicular to the vertical direction, and the extension direction of the third position limiting portion 33 is substantially parallel to the vertical direction. The third position limiting portion 33 and the fourth position limiting portion 53 engage to limit the rotation angle of the stopper 5 in the first direction. When the stopper 5 receives an external force and rotates in a first direction, the third position limiting portion 33 limits the rotation stroke of the fourth position limiting portion 53 to prevent the rotation angle of the stopper 5 from becoming too large. In another alternative embodiment, the stopper 5 may be rotatably mounted directly on the side surface or distal end surface of the mounting portion 30 of the connecting member 3 without providing the mounting groove 31 in the mounting portion 30, which is also within the scope of protection of the present disclosure.

[0036] In this embodiment, the stopper 5 transitions from the first state to the second state by a drive member 4. The drive member 4 is a trigger block provided on the staple cartridge assembly 1. A first drive unit 41 is provided on the proximal side of the drive member 4, and a second drive unit 55 that engages with the first drive unit 41 is provided on the side of the stopper 5 facing the axis of the anastomosis instrument. A first guide surface 411 and a second guide surface 551 are provided on opposing sides of the first drive unit 41 and the second drive unit 55, respectively. The first guide surface 411 is an inclined surface located above the first drive unit 41. In this embodiment, the first stopper unit 51 and the second drive unit 55 are provided integrally; that is, as shown in FIG. 11 , a bump protruding toward the cutter 6 functions as the first stopper unit 51 and the first drive unit 41. When the stopper 5 is in the first state, the side of the first stopper portion 51 facing the staple cartridge assembly 1 is the second guide surface 551, and in this case, the second guide surface 551 is inclined in both the vertical and axial directions.

[0037] 5 and 12 to 15, when the staple cartridge assembly 1 is released relative to the staple anvil assembly 2, the drive member 4 is located on the proximal side of the staple cartridge assembly 1. However, because the staple cartridge assembly 1 is located away from the staple anvil assembly 2, the drive member 4 is located at position 4a in FIG. 5 and does not contact the stopper 5, and the stopper 5 is in a first state due to the action of the torsion spring 81. The cutter 6 is located at position 6a on the proximal side of the stopper 5, and there is a first axial distance between the second stopper portion 621 and the first stopper portion 51 of the stopper 5. When the cutter 6 moves a second distance in the distal direction to position 6b, the staple cartridge assembly 1 gradually approaches the staple anvil assembly 2 to close the jaws, and the drive member 4 moves along with the staple cartridge assembly 1 to position 4b. Because the first distance is greater than the second distance, there is a third axial distance between the proximal side of the drive member 4 and the distal side of the cutter 6, the third distance being the distance between positions 4b and 6b and approximately equal to the difference between the first and second distances. In another embodiment, the second distance may be equal to the first distance, in which case the proximal side of the drive member 4 abuts against the distal side of the cutter 6. When the drive member 4 moves from position 4a to position 4b, the first drive portion 41 of the drive member 4 moves toward the stopper 5 until it abuts against the second drive portion 55, driving the stopper 5 to rotate in the first direction, and the first stopper portion 51 moves in a direction away from the axis of the anastomosis instrument, transitioning the stopper 5 to the second state.

[0038] Hereinafter, the operating principle of the stopper 5 in different states will be specifically explained with reference to FIG. 5 and FIGS.

[0039] When the staple cartridge assembly 1 is released relative to the staple anvil assembly 2, the drive member 4 is located at a position 4a on the proximal side of the staple cartridge assembly 1 and is not in contact with the stopper 5. The cutter 6 is located at a position 6a on the proximal side of the staple cartridge assembly 1. As shown in FIGS. 10 and 11 , the stopper 5 is not subjected to the biasing force of the drive member 4, and the stopper 5 is maintained in the first state by the action of the torsion spring 81, with the first stopper portion 51 located in the path toward the distal side of the second stopper portion 621. The cutter 6 is located on the proximal side of the stopper 5, and there is a first axial distance between the second stopper portion 621 and the first stopper portion 51 of the stopper 5.

[0040] When the staple head portion is brought into the surgical position, it is necessary to close the jaws to clamp the tissue. In this case, when the operating handle is grasped and the transmission mechanism is driven to move the cutter pushing rod 7 and the cutter 6 in the distal direction by a second distance to reach position 6b, the staple cartridge assembly 1 gradually approaches the staple anvil assembly 2 to close the jaws, and the drive member 4 moves along with the staple cartridge assembly 1 to position 4b, where there is a third distance between the proximal side of the drive member 4 and the distal end of the cutter 6. As shown in Figures 12 and 14, during the jaw closing process, the first drive portion 41 of the drive member 4 abuts against the second drive portion 55 of the stopper 5, rotating the stopper 5 in a first direction, moving the first stopper portion 51 away from the axial direction of the anastomosis instrument, i.e., moving it outward from the cutter 6, and the stopper 5 moves until it reaches the second state shown in Figure 15, the torsion spring 81 is compressed and elastically deformed, and the first stopper portion 5 moves away from the path along which the second stopper portion 621 moves in the distal direction.

[0041] When closure of the staple head portion is complete and the stopper 5 has transitioned to the second state, the operating handle is gripped again, and the transmission mechanism is used to drive the cutter pushing rod 7 and the cutter 6 so that they move further in the distal direction. The cutter 6 first moves to position 6c and abuts against the proximal side of the drive member 4, which then drives the drive member 4, which is located at position 4b, in the distal direction to reach position 4c, pushing out the staples to suture the tissue, and the cutter 6 cuts the tissue, successfully triggering the anastomosis instrument. During the triggering process of the anastomosis instrument, the drive member 4 moves distally, separating the first drive part 41 and the second drive part 55, and the first stopper part 51 of the stopper 5 abuts against the side wall of the connecting part 62 of the cutter 6, maintaining it in the second state. After the cutter 6 has completely moved to the distal side of the stopper 5, as shown in FIG. 16 , the first stopper part 51 of the stopper 5 abuts against the side surface of the cutter pushing rod 7, maintaining the stopper 5 in the second state, and the torsion spring 81 is maintained in a state where it has an elastic deformation amount.

[0042] After the triggering of the anastomosis instrument is completed, the stopper 5 is still in the second state due to the maintaining action of the cutter pusher rod 7, and in this case, the return mechanism drives the cutter 6 and the cutter pusher rod 7 to return in the proximal direction, and the drive member 4 remains at position 4c and does not return to the proximal side of the staple cartridge assembly 1. In the process of the cutter 6 returning from the distal end to the proximal side, the first stopper portion 51 of the stopper 5 still abuts against the side wall of the cutter pusher rod 7, and when the cutter 6 moves at the position of the stopper 5, the first stopper portion 51 abuts against the side wall of the connecting portion 62 of the cutter 6 until the cutter 6 has completely returned to the proximal side of the first stopper portion 51. When fully returned, the first stopper portion 51 does not come into contact with the cutter 6 or cutter pushing rod 7, and there is no contact driving action of the drive member 4, so the elastic deformation restoring force of the torsion spring 81 causes the stopper 5 to rotate in the second direction, and the first stopper portion 51 moves in a direction approaching the axis of the anastomosis instrument, i.e., inward, causing the first stopper portion 51 to again enter the path along which the second stopper portion 621 moves in the distal direction, and the stopper 5 transitions to the first state. In this case, when the operating handle is gripped to move the cutter 6 in the distal direction to the closed position of the staple head portion, the stopper 5 remains in the first state because there is no drive member 4 on the proximal side of the staple cartridge assembly 1, and even if the operating handle is gripped to drive the cutter 6 in the distal direction, as shown in Fig. 17, the second stopper portion 621 of the cutter 6 is blocked by the first stopper portion 51 of the stopper 5, so the cutter 6 cannot continue to move in the distal direction and the anastomosis instrument cannot be triggered. This effectively prevents a second erroneous triggering when the staple cartridge 11 has not been replaced.

[0043] 18 to 20 show a structure in which a stopper 5 according to a second embodiment of the present disclosure is engaged with a connecting member 3. This embodiment differs from the first embodiment in the structure in which the connecting member 3 engages with the stopper 5 and the structure in which an elastic member engages with the stopper 5. In this embodiment, the elastic member is a compression spring 82, and a compression spring passage 35 that accommodates the compression spring 82 is provided inside the mounting groove 31. The compression spring 82 is movably provided in the compression spring passage 35, which is perpendicular to the side wall of the cutter 6, and the axial width of the compression spring passage 35 is greater than the axial width of the mounting groove 31, thereby preventing the compression spring 82 from falling out from below the mounting groove 31. Both ends of the compression spring 82 abut against the bottom wall of the compression spring passage 35 and the outer surface of the stopper 5, respectively. The second position limiting portion 52 is a protrusion located above the pivot portion 54 and protruding inward relative to the pivot portion 54, and the first position limiting portion 32 is a stepped portion located on the bottom wall of the mounting groove 31 and shaped to match the second position limiting portion 52, limiting the rotation angle of the stopper 5 in the second direction, with the upper surface of the stepped portion being substantially perpendicular to the vertical direction and intersecting the extension direction of the third position limiting portion 33. The second position limiting portion 52 can also enhance the structural strength of the entire stopper 5. The third position limiting portion 33 is an inner wall located below the compression spring passage 35, and the fourth position limiting portion 53 is a side wall of the mounting groove 31 located below the pivot portion 54 and outside the stopper 5. When the stopper 5 receives an external force and rotates in the first direction to transition to the second state, the stopper 5 compresses the compression spring 82 to elastically deform it, and the third position limiting portion 33 and the fourth position limiting portion 53 engage to limit the rotation angle in the first direction. After the external force received by the stopper 5 is removed, the elastic deformation restoring force of the compression spring 82 causes the stopper 5 to rotate in the second direction and transition to the first state. The other configurations of the second embodiment are the same as the corresponding configurations of the first embodiment, and therefore will not be described here.The structure of the second embodiment may be combined with that of the first embodiment. For example, the torsion spring 81 provided in the mounting groove 31 in the first embodiment may be replaced with a compression spring 82, leaving the structure of the stopper 5 unchanged. Alternatively, the engagement structure between the mounting groove 31 and the stopper 5 in the first embodiment may be replaced with the structure in the second embodiment, leaving the torsion spring 81 as the elastic member. In this embodiment, the torsion spring 81 in the first embodiment is replaced with a compression spring 82, reducing the gap between the stopper 5 and the connecting member 3 and increasing the connecting strength, thereby preventing the stopper 5 from yawing during use.

[0044] In the above embodiment, the first clamp is described as a staple cartridge assembly and the second clamp is described as a staple anvil assembly, the staple anvil assembly is fixed to the connecting member, the staple cartridge assembly is rotatable relative to the connecting member, and the drive member is provided on the staple cartridge assembly. In another alternative embodiment, the first clamp may be a staple anvil assembly, the second clamp may be a staple cartridge assembly, the drive member is provided on the staple anvil assembly, the staple cartridge assembly is fixed to the connecting member, and the staple anvil assembly is rotatable relative to the connecting member. Before the staple head portion is closed, the drive member of the staple anvil assembly is away from the stopper and does not abut against the second drive portion, and after the staple head portion is closed, when the drive member is on the proximal side of the staple anvil assembly, the drive member abuts against the second drive portion and can drive the stopper to transition to the second state.

[0045] In the above embodiments, the first stopper portion and the second drive portion are integrally provided. In other alternative embodiments, the first stopper portion and the second drive portion may be two separate members, for example, provided as two bumps on the inside of the stopper, and the second drive portion is located below the first stopper portion. When the staple cartridge assembly rotates to gradually close the jaws, the first drive portion first abuts against the second drive portion and drives the stopper to rotate in the first direction.

[0046] In the above embodiment, two elastic members, a torsion spring and a compression spring, are shown as examples. However, in other alternative embodiments, the elastic member may have a different structure. For example, the compression spring in the second embodiment may be replaced with an elastic plate, an elastic pad, or the like, or the elastic member may be a tension spring connected between the inside of the stopper and a position of the staple cartridge holder close to the second direction, and in the first state, the biasing force applied by the tension spring to the stopper is a force that pulls the first stopper portion inward.

[0047] The above is a detailed description of the present disclosure with reference to preferred embodiments, and the specific implementation of the present disclosure is not limited to these descriptions. Those skilled in the art may make some simple modifications or substitutions without departing from the concept of the present disclosure, all of which fall within the scope of protection of the present disclosure. [Explanation of symbols]

[0048] 1 Staple Cartridge Assembly 11 Staple cartridge 12 Staple cartridge holder 121 Second cutter guide groove 2 Staple Anvil Assembly 21 Staple anvil body 211 First cutter guide groove 22 Staple anvil housing 3 Connecting members 30 Mounting part 31 Mounting groove 32 First position limiting section 33 Third position limiting section 34 Mounting hole 35 compression spring passage 36 pin shaft 4 Driving member 41 First drive unit 411 First Information Desk 5 Stopper 51 First stopper part 52 Second position limiting section 53 Fourth position limiter 54 Pivot 55 Second drive unit 551 Second Information Desk 6 cutter 61 1st crossbeam 62 Connecting part 621 Second stopper part 63 2nd crossbeam 7 Cutter pressing rod 81 Torsion spring 82 Compression spring 9 Sleeve

Claims

1. A staple head portion for use in a surgical anastomosis instrument, a first clamp and a second clamp provided opposite to each other; a connecting member connected to a proximal side of the first clamp and the second clamp; a stopper rotatably attached to the connecting member and including a first stopper portion; and a trigger mechanism that is movable in the axial direction of the anastomosis instrument and includes a second stop portion; When the stopper is in a first state, the first stopper portion is located on the path along which the second stopper portion moves in the distal direction, and when the stopper receives an external force and rotates in a first direction relative to the connecting member, moving the first stopper portion in a direction away from the axis of the anastomotic instrument, the stopper transitions to a second state, and the first stopper portion moves away from the path along which the second stopper portion moves in the distal direction. A staple head portion characterized by:

2. an attachment portion for attaching the stopper is provided at the distal end of the connecting member, and when the first clamp and the second clamp are in an open state, at least a portion of the attachment portion is provided on the side of the second stopper portion away from the axial center of the anastomotic instrument, and there is a first distance in the axial direction between the first stopper portion and the second stopper portion; The staple head according to claim 1 .

3. the stopper further includes a pivot portion, the pivot portion being rotatably attached to the attachment portion via a pin shaft, and when the stopper is in the first state, the first stopper portion protrudes further than the pivot portion in a direction toward the axial center of the anastomotic instrument. The staple head according to claim 2 .

4. the staple head portion further includes a drive member, the drive member being provided on the first clamp and movable in the axial direction of the anastomosis instrument, and the first clamp being rotatable relative to the connecting member; When the drive member is located proximal to the first clamp and rotates until the first clamp is closed relative to the second clamp, the drive member abuts against the stopper and drives the stopper to transition from the first state to the second state. The staple head according to claim 2 .

5. When the stopper transitions from the first state to the second state, the trigger mechanism moves a second distance in a distal direction, the first distance being equal to or greater than the second distance.

5. The staple head according to claim 4.

6. a first drive portion is provided on the proximal side of the drive member, and a second drive portion that engages with the first drive portion is provided on the side of the stopper facing the axial center of the anastomotic instrument; 5. The staple head according to claim 4.

7. The first driving portion and the second driving portion are provided with a first guide surface and a second guide surface on opposite sides, respectively. The staple head according to claim 6 .

8. the first stopper portion and the second drive portion are integrally provided, and when the stopper is in the first state, the side of the first stopper portion facing the first clamp is the second guide surface; The staple head according to claim 7 .

9. the trigger mechanism includes a cutter and a cutter pushing rod, the second stopper portion is provided at a distal end of the cutter, and the proximal end of the cutter is connected to the cutter pushing rod; The staple head according to claim 1 .

10. When the stopper is in the second state and the trigger mechanism moves in a distal direction, at least a portion of the stopper abuts against a side surface of the cutter pushing rod and is maintained in the second state. The staple head according to claim 9 .

11. the staple head portion further includes an elastic member configured to apply a biasing force to the stopper to rotate it in a second direction, the second direction being opposite to the first direction; The staple head according to claim 3 .

12. an attachment groove that opens in a direction toward the axial center of the anastomotic instrument is provided in the attachment portion, and at least a portion of the stopper enters the attachment groove; The staple head according to claim 11 .

13. The elastic member is a torsion spring provided on the pin shaft, or a compression spring provided between the stopper and the inner wall of the mounting groove. The staple head according to claim 12 .

14. the coupling member includes a first position limiting portion, the mounting groove is provided with a second position limiting portion, and the first position limiting portion and the second position limiting portion are engaged to limit the rotation angle of the coupling member in the second direction; and / or the connecting member further includes a third position limiting portion, the stopper includes a fourth position limiting portion, and the third position limiting portion and the fourth position limiting portion engage with each other to limit a rotation angle of the connecting member in a first direction; The staple head according to claim 12 .

15. a compression spring passage defined within the mounting groove, the compression spring being movably disposed within the compression spring passage, the compression spring passage being perpendicular to a side wall of the trigger mechanism, and the axial width of the compression spring passage being greater than the axial width of the mounting groove; The staple head according to claim 13 .

16. A staple head portion according to any one of claims 1 to 15. A surgical anastomosis instrument characterized by:

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