Staple cartridge assembly and medical stapler

Abstract

This invention provides a staple cartridge assembly and a medical stapler. The staple cartridge assembly includes: a staple cartridge frame; a connector disposed on the proximal side of the staple cartridge frame for connecting the staple cartridge assembly to the instrument platform of the medical stapler; a first stop arm connected to the connector on its proximal side, and having a first stop portion and a first drive portion on its distal side; and a cutter including a second stop portion. When the first drive portion is not subjected to external force, and the first stop arm is in a first state, the first stop portion prevents the second stop portion from moving distally. This invention can simply and effectively prevent secondary firing of the stapler without replacing the already fired staple cartridge.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a staple cartridge assembly and a medical stapler. Background Technology

[0002] In the prior art, medical staplers generally include an instrument platform, a firing handle movably connected to the instrument platform, and a staple head mounted on the instrument platform. The staple cartridge assembly can be inserted through a small incision in the body via a trocar to access the surgical site for surgery. The staple head includes a staple cartridge assembly and an anvil arranged opposite each other. The staple cartridge assembly generally includes a staple cartridge, a staple cartridge holder, and a firing block, a cutting blade, and a pusher rod arranged sequentially from the distal to the proximal side of the stapler, with the pusher rod located within a housing. When the stapler is fired, the pusher rod pushes the cutting blade to move distally. During the movement of the cutting blade, the staple cartridge assembly and the anvil close, cutting the tissue located between the staple cartridge assembly and the anvil, and driving the firing block to push the staples out of the staple cartridge and attach them to the tissue.

[0003] After completing the above suturing and cutting actions, the operator needs to reset the stapler and then replace the staple cartridge assembly so that the medical stapler can be used for the next suturing and cutting operation. However, during the operation, there may be situations where the operator fires the stapler again without replacing the already fired staple cartridge, or fires the stapler without installing it, which may lead to adverse consequences.

[0004] In this invention, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical position, is the distal side. Summary of the Invention

[0005] To address the problems in the prior art, the present invention aims to provide a staple cartridge assembly and a medical stapler, which, by setting a first stop arm on the connector and switching the state of the first stop arm, simply and effectively prevents the stapler from firing a second time when the already fired staple cartridge has not been replaced.

[0006] This invention provides a staple cartridge assembly, comprising:

[0007] Stapling rack;

[0008] A connector, located on the proximal side of the staple cartridge frame, is used to connect the staple cartridge assembly to the instrument platform of the medical stapler;

[0009] At least one first stop arm, the proximal end of the first stop arm being connected to the connector, and the distal end of the first stop arm being provided with a first stop portion and a first drive portion, the first stop arm including a first state; and

[0010] A cutting blade, wherein the cutting blade is provided with a second stop;

[0011] When the first drive unit is not subjected to external force, and the first stop arm is in the first state, the first stop unit is at least partially located on the path along which the second stop unit moves from the proximal side to the distal side of the staple cartridge.

[0012] In some embodiments, a firing block is further included, the firing block being provided with a second driving part, and the first stop arm further includes a second state. When the second driving part is located on the proximal side of the staple cartridge frame, the second driving part cooperates with the first driving part to drive the first stop part to move in a direction away from the inner surface of the staple cartridge frame. The first stop arm enters the second state from the first state, and the first stop part disengages from the path of the second stop part moving from the proximal side to the distal side of the staple cartridge frame.

[0013] In some embodiments, when the first stop arm is in the first state, the distance between the lowest point of the first stop portion and the inner surface of the staple cartridge frame is less than the distance between the highest point of the second drive portion and the inner surface of the staple cartridge frame.

[0014] When the first stop arm is in the second state, the distance between the lowest point of the first stop part and the inner surface of the staple cartridge frame is greater than the distance between the highest point of the second drive part and the inner surface of the staple cartridge frame.

[0015] In some embodiments, when the first stop arm is in the first state, the distance between the lowest point of the first drive unit and the inner surface of the staple cartridge is less than the distance between the highest point of the second drive unit and the inner surface of the staple cartridge.

[0016] When the second drive unit is located on the proximal side of the staple cartridge holder, the second drive unit enters between the first drive unit and the inner surface of the staple cartridge holder to drive the distal side of the first stop arm to move away from the inner surface of the staple cartridge holder, thereby increasing the distance between the lowest point of the first stop unit and the inner surface of the staple cartridge holder.

[0017] In some embodiments, when the first stop arm is in the first state, there is a first gap between the lowest point of the first drive portion and the inner surface of the staple cartridge.

[0018] In some embodiments, a first stop surface is provided on the proximal side of the first stop portion, and a second stop surface is provided on the distal side of the second stop portion;

[0019] When the first stop arm is in the first state and the second stop part moves to the proximal side of the first stop part, the second stop surface abuts against the first stop surface.

[0020] In some embodiments, the first stop surface and / or the second stop surface are vertical surfaces.

[0021] In some embodiments, a first stop mating surface is further provided on the proximal side of the first stop surface, and a second stop mating surface is provided on the side of the second stop portion away from the inner surface of the staple cartridge, wherein the first stop mating surface and the second stop mating surface are parallel to the axial direction.

[0022] The first stop surface is perpendicular to the first stop mating surface, and the second stop surface is perpendicular to the second stop mating surface; or;

[0023] An acute angle is formed between the first stop surface and the first stop mating surface, and an acute angle is formed between the second stop surface and the second stop mating surface.

[0024] In some embodiments, a third stop portion is further provided on the distal side of the first stop arm, and at least one fourth stop portion is provided on the inner side of the staple cartridge. When the first stop arm is in the first state, the third stop portion is located on the proximal side of the fourth stop portion, and the third stop portion abuts against the fourth stop portion.

[0025] In some embodiments, a vertical third stop surface is provided on the distal end of the third stop portion, and a vertical fourth stop surface is provided on the proximal end of the fourth stop portion. When the first stop arm is in the first state, the third stop surface and the fourth stop surface abut against each other.

[0026] In some embodiments, the third stop is located outside the first stop, and when the first stop arm is in the first state, the first stop and the second stop are aligned axially with the stapler, and the second stop and the fourth stop are aligned axially with the stapler.

[0027] In some embodiments, the distance between the inner side of the fourth stop and the center line of the staple cartridge is greater than the distance between the outer side of the second stop and the center line of the staple cartridge.

[0028] In some embodiments, the first drive unit is located at the distal end of the first stop unit, and the distance between the inner side of the fourth stop unit and the center line of the staple cartridge frame is greater than the distance between the outer side of the first drive unit and the center line of the staple cartridge frame.

[0029] In some embodiments, a first guide surface is provided on the distal side of the first driving portion, and / or a second guide surface is provided on the proximal side of the second driving portion.

[0030] In some embodiments, the first stop arm is at least partially elastic, and the first stop arm undergoes elastic deformation when it transitions from the first state to the second state.

[0031] After the second drive unit moves toward the distal end of the staple cartridge and disengages from the first drive unit, the first stop arm moves from the second state to the first state under the action of the elastic deformation restoring force of the first stop arm.

[0032] In some embodiments, the first stop portion further includes a first connecting segment and an arc-shaped transition segment, the proximal end of the first connecting segment being connected to the distal end of the first connector, the proximal end of the arc-shaped transition segment being connected to the distal end of the first connecting segment, and the distal end of the arc-shaped transition segment being provided with the first driving portion and the first stop portion.

[0033] In some embodiments, the first stop arm is located on the distal side of the connector, and the first stop arm is integrally formed with at least a portion of the connector.

[0034] In some embodiments, the connector includes a first connector and a second connector, the second connector being located below the first connector, and the first connector being integrally formed with the first stop arm.

[0035] In some embodiments, a concave first arc surface is provided at the connection position between the upper surface of the proximal side of the first stop arm and the connector.

[0036] In some embodiments, the device includes two first stop arms, which are symmetrically arranged with respect to the centerline of the staple cartridge assembly. The second stop portion is a protrusion disposed on both sides of the cutter, and the proximal side of the firing block is provided with two second drive portions.

[0037] In some embodiments, the second drive portion is an extension arm extending from the bottom of the firing block toward the proximal side.

[0038] In some embodiments, the staple cartridge assembly further includes a staple cartridge housed in the staple cartridge holder, and the stapler further includes an anvil disposed opposite to the staple cartridge, the anvil having a third state open relative to the staple cartridge assembly and a fourth state closed relative to the staple cartridge assembly;

[0039] The cutter includes a first position and a second position located on the proximal side of the staple cartridge, the first position being located on the proximal side of the second position; when the cutter is in the first position, the anvil is in the third state, and when the cutter moves from the first position to the second position, the cutter drives the anvil into the fourth state;

[0040] When the first stop arm is in the first state and the anvil is in the fourth state, the second stop portion of the cutter abuts against the first stop portion of the first stop arm.

[0041] In some embodiments, the staple cartridge assembly further includes a staple cartridge housed in the staple cartridge frame, wherein a first mating portion is provided on the side of the staple cartridge away from the staple cartridge frame;

[0042] The staple cartridge assembly further includes a second stop arm, which is located on the side of the first stop arm away from the staple cartridge frame. The proximal end of the second stop arm is connected to the connector, and the distal end of the second stop arm is provided with a second mating part. The second mating part is located on the side of the first mating part away from the staple cartridge frame, and the second mating part abuts against the first mating part.

[0043] In some embodiments, the second stop arm is integrally formed with at least a portion of the connector, and the second stop portion is at least partially elastic.

[0044] This invention also provides a medical stapler, including the above-described staple cartridge assembly.

[0045] The staple cartridge assembly and medical stapler provided by this invention have the following advantages:

[0046] This invention provides a staple cartridge assembly for a medical stapler. A first stop arm with switchable state is provided on the connector. After the stapler is fired, the cutter returns to the proximal side of the staple cartridge frame, and the first drive unit is not subjected to external force. At this time, the first stop arm is in the first state. Even if the firing handle is held, the stapler cannot be fired due to the blocking effect of the first stop arm on the cutter, thereby effectively preventing the stapler from firing again without replacing the fired staple cartridge. Attached Figure Description

[0047] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0048] Figure 1 This is a schematic diagram of the structure of the staple cartridge assembly and the staple anvil in accordance with an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the structure of a staple cartridge assembly according to an embodiment of the present invention;

[0050] Figure 3 and Figure 4 This is a schematic diagram of the structure of a connector according to an embodiment of the present invention;

[0051] Figure 5This is a schematic diagram of the firing block according to an embodiment of the present invention;

[0052] Figure 6 This is a schematic diagram of the structure of a cutter according to an embodiment of the present invention;

[0053] Figure 7 This is a schematic diagram of the structure of a staple cartridge frame according to an embodiment of the present invention;

[0054] Figure 8 This is a schematic diagram of the staple cartridge assembly (staple cartridge omitted) when the firing block is on the proximal side according to an embodiment of the present invention;

[0055] Figure 9 This is a partial top view of the staple cartridge assembly (staple cartridge omitted) with the firing block in the proximal position according to an embodiment of the present invention;

[0056] Figure 10 yes Figure 9 A sectional view along the A1-A1 direction;

[0057] Figure 11 yes Figure 9 A sectional view along the A2-A2 direction;

[0058] Figure 12 This is a schematic diagram of the cooperation between the second stop and the fourth stop in an embodiment of the present invention;

[0059] Figure 13 This is a partial structural schematic diagram of the staple cartridge assembly (staple cartridge omitted) when the firing block is on the distal side according to an embodiment of the present invention;

[0060] Figure 14 This is a partial top view of the staple cartridge assembly (staple cartridge omitted) when the firing block is on the distal side according to an embodiment of the present invention;

[0061] Figure 15 yes Figure 14 A sectional view along the A3-A3 direction;

[0062] Figure 16 yes Figure 14 A sectional view along the A4-A4 direction;

[0063] Figure 17 This is a schematic diagram of the structure of a staple cartridge assembly without a staple cartridge frame according to an embodiment of the present invention;

[0064] Figure 18 This is a partial structural diagram of the first connector and the staple cartridge cover in an embodiment of the present invention;

[0065] Figure 19 This is a schematic diagram of the structure of the first connector according to another embodiment of the present invention;

[0066] Figure 20This is a top view of the first connector according to another embodiment of the present invention;

[0067] Figure 21 yes Figure 20 A sectional view along the A5-A5 direction;

[0068] Figure 22 This is a schematic diagram of the structure of the first connector and the cutter in another embodiment of the present invention;

[0069] Figure 23 This is a top view of the first connector and the cutter in cooperation according to another embodiment of the present invention;

[0070] Figure 24 yes Figure 23 A sectional view along the A6-A6 direction.

[0071] Figure label:

[0072] 1. Stud cartridge 52. First crossbeam.

[0073] 11. The distal side of the staple cartridge, 53. The second crossbeam.

[0074] 12. Connecting part on the proximal side of the staple cartridge 54

[0075] 13. Feed groove in the feed tube, 55. Cutting edge.

[0076] 14 Nail cartridge body 6 Nail anvil

[0077] 141 Nail cartridge surface 7 First stop arm

[0078] 15. Nail cartridge cover 71. Distal side of the first stop arm

[0079] 151 First mating part 72 Proximal side of the first stop arm

[0080] 1511 First mating surface 721 First circular arc surface

[0081] 2. Stamping Frame 73. First Stop Section

[0082] 21. The distal side of the staple cartridge rack, 731. First stop surface.

[0083] 22 Proximal side of the staple cartridge rack 74 Third stop

[0084] 23. Stud cartridge holder tool track 741. Third stop surface.

[0085] 24 Fourth stop section 75 First drive section

[0086] 241 Fourth stop surface 751 First guide surface

[0087] 25 Connecting pin 76 First connecting section

[0088] 31 First Connector 77 Arc-shaped Transition Section

[0089] 311 Pin hole 78 First stop mating surface

[0090] 32 Second connecting piece 8 Second stop arm

[0091] 4. Firing Block 81, Second Mating Section

[0092] 41 Second drive unit 811 Second mating surface

[0093] 411 Second guide surface 82 Proximal side of the second stop arm

[0094] 5. Cutting blade 821. Second arc surface.

[0095] 51 Second stop section 83 Second connecting section

[0096] 511 Second stop surface 84 Inclined section

[0097] 512 Second stop mating surface Detailed Implementation

[0098] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0099] This invention provides a stapler cartridge assembly for a medical stapler and a medical stapler including the stapler cartridge assembly. The medical stapler includes an instrument platform, a firing handle movably connected to the instrument platform, and a staple head mounted on the instrument platform. The staple head includes a stapler cartridge assembly and a staple anvil disposed opposite each other. The stapler cartridge assembly includes a stapler cartridge frame, a connector, and a cutter. The stapler cartridge frame is used to house the stapler cartridge, and the surface of the stapler cartridge frame facing the bottom of the stapler cartridge is an inner surface. The cutter is movable along the axial direction of the stapler. The connector is located on the proximal side of the stapler cartridge frame and is used to connect the stapler cartridge assembly to the instrument platform of the medical stapler.

[0100] Furthermore, to prevent secondary firing of the stapler without replacing the already fired cartridge, at least one first stop arm is provided on the proximal side of the connector. The proximal side of the first stop arm is connected to the connector, and the distal side of the first stop arm is provided with a first stop portion and a first drive portion. The first stop arm includes a first state. When the first drive portion does not receive external force, the first stop arm is in the first state, and the first stop portion is at least partially located on the path of the second stop portion moving from the proximal side to the distal side of the cartridge holder. At this time, even if the firing handle is held, the cutter cannot move to the distal side of the cartridge holder to fire the stapler, and the stapler is in a safety state.

[0101] Furthermore, in some embodiments, the staple cartridge assembly further includes a firing block, the firing block including a second drive portion, and the first stop arm further including a second state. When the second drive portion is located on the proximal side of the staple cartridge frame, the second drive portion cooperates with the first drive portion to drive the first stop portion to move away from the inner surface of the staple cartridge frame. The first stop arm moves from the first state to the second state, and the first stop portion disengages from the path of the second stop portion moving from the proximal side to the distal side of the staple cartridge frame. At this time, if the firing handle is held, the cutter can move distally to fire the stapler.

[0102] In the initial state, both the firing block and the cutter are located on the proximal side of the staple cartridge holder. The second drive unit cooperates with the first drive unit to drive the first stop part to move away from the inner surface of the staple cartridge holder. The first stop arm moves from the first state to the second state, and the first stop part disengages from the path of the second stop part moving from the proximal side to the distal side of the staple cartridge holder. At this time, the first stop arm does not obstruct the movement of the cutter towards the distal side of the staple cartridge holder. At this time, if the firing handle is held, the cutter can be driven to move towards the distal side of the staple cartridge holder. The cutter drives the firing block to move distally to push the staples outward, while the cutter cuts the tissue, thus firing the stapler.

[0103] After the stapler is fired, the firing block remains on the distal side of the staple cartridge holder, while the cutter returns to the proximal side of the staple cartridge holder under the action of the reset mechanism. At this time, the first drive part of the first stop arm loses the driving action of the second drive part of the firing block and returns to the first state, that is, the first stop part is at least partially located on the path of the second stop part moving from the proximal side to the distal side of the staple cartridge holder. At this time, even if the firing handle is held, the cutter cannot move to the distal side of the staple cartridge holder to fire the stapler, thereby avoiding the situation of firing again without replacing the already fired staple cartridge.

[0104] The structure of the staple cartridge component of various specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the various specific embodiments are not intended to limit the scope of protection of the present invention.

[0105] Figures 1-18 This is a schematic diagram of a staple cartridge assembly according to an embodiment of the present invention. In this embodiment, a staple cartridge assembly for a medical stapler and a medical stapler including the assembly are provided. The medical stapler includes an instrument platform (not shown in the figure), a firing handle (not shown in the figure) movably connected to the instrument platform, and a staple head mounted on the instrument platform. Figure 1 As shown, the staple head includes a staple cartridge assembly and a staple anvil 6 disposed opposite to each other. The staple cartridge assembly includes a staple cartridge 1 for receiving an anastomosis staple and a staple cartridge holder 2 for receiving the staple cartridge 1. The proximal side of the staple anvil 6 is rotatably connected to the proximal side of the staple cartridge assembly, such that the staple anvil 6 has a third state of being open relative to the staple cartridge assembly and a fourth state of being closed relative to the staple cartridge assembly. When the staple anvil 6 is in the fourth state, tissue is clamped between the staple anvil 6 and the staple cartridge assembly. Figure 1 The image shows the fourth state of the anvil 6. For example... Figure 2 As shown, the staple cartridge assembly includes a staple cartridge frame 2, a staple cartridge 1 housed within the staple cartridge frame 2, and a cutter 5. The surface of the staple cartridge frame 2 facing the staple cartridge 1 is the inner surface of the staple cartridge frame 2, that is, the surface of the staple cartridge frame 2 opposite to the bottom surface of the staple cartridge 1. The staple cartridge 1 is used to hold staples, and the upper surface of the staple cartridge 1 is a staple cartridge surface 141, on which multiple staple holes are provided. Figure 8 As shown, the staple cartridge assembly also includes a firing block 4, used to eject the staples from the staple cartridge 1 when the stapler is fired. Figure 2 As shown, the staple cartridge holder 2 is provided with a staple cartridge holder knife groove 23 extending along the axial direction of the stapler. The cutter 5 at least partially enters the staple cartridge holder knife groove 23 and can move along the extending direction of the staple cartridge holder knife groove 23. The initial position of the firing block 4 and the initial position of the cutter 5 are both located on the proximal side of the staple cartridge holder 2. The cutter 5 includes a first position and a second position located on the proximal side of the staple cartridge holder 2. The first position is located on the proximal side of the second position, and both the first position and the second position are located on the proximal side of the initial position of the firing block 4. In the initial state, the anvil 6 is in a third state open relative to the staple cartridge assembly, the firing block 4 is located on the proximal side of the staple cartridge holder 2, and the cutter 5 is located in the first position. When the cutter 5 moves from the first position to the second position, the cutter 5 will drive the anvil 6 from the third state to the fourth state, so that the anvil 6 is closed relative to the staple cartridge assembly.

[0106] In this invention, the distal and proximal sides are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, i.e., closer to the surgical position, is the distal side. The direction along the axis of the stapler is the axial direction, i.e., the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in Figure 2 From the perspective of the staple cartridge 2, its distal side 21 is the left side, and its proximal side 22 is the right side. For the staple cartridge 1, its distal side 11 is the left side, and its proximal side 12 is the right side. Definitions Figure 2 In this context, the S1 direction is the direction from the distal end to the proximal end of the stapler. The S1 direction, or the direction opposite to S1, is defined as the axis of the stapler. Figure 9 In this context, S2 represents the horizontal direction, i.e., the width direction. (Definition) Figure 10 In this invention, the S3 direction is the longitudinal direction, i.e., the height direction. For a given component, the inner and outer sides are relative to the axis of the anastomosis device; the side closer to the axis is the inner side, and the side farther from the axis is the outer side.

[0107] like Figure 2 As shown, the staple cartridge assembly also includes a connector located on the proximal side of the staple cartridge holder 2. In this embodiment, the connector includes a first connector 31 located above and a second connector 32 located below. The connector is used to connect the staple cartridge assembly to the instrument body. Figure 2 and Figure 3 As shown, the proximal side 12 of the staple cartridge 1 is connected to the first connector 31 via a connecting pin 25, and the side wall of the first connector 31 is provided with a pin hole 311 corresponding to the connecting pin 25. Figure 3 and Figure 4 As shown, a first stop arm 7 is provided on the distal end of the first connector 31. The first stop arm 7 is an elastic arm that is at least partially elastic. In this embodiment, the first stop arm 7 and the first connector 31 are integrally formed. There are two first stop arms 7, which are respectively located on the left and right sides of the staple cartridge holder's tool path groove 23, and are symmetrically arranged with respect to the center line of the staple cartridge assembly. In another alternative embodiment, the first stop arm 7 and the first connector 31 can also be separately provided, with the proximal end 72 of the first stop arm 7 fixed to the first connector 31 by welding or other fixing methods. In yet another alternative embodiment, the number of first stop arms 7 may not be two, but one or another number.

[0108] like Figure 3 and Figure 4As shown, the distal end 71 of the first stop arm 7 is provided with a first stop portion 73 and a first drive portion 75. The first stop arm 7 also includes a first connecting section 76 and an arc-shaped transition section 77. The proximal end of the first connecting section 76 is connected to the distal end of the first connector 31, and the proximal end of the arc-shaped transition section 77 is connected to the distal end of the first connecting section 76. The distal end of the arc-shaped transition section 77 is provided with the first drive portion 75 and the first stop portion 73. The arc-shaped transition section 77 can provide better elastic deformation capability for the first stop arm 7. The first drive portion 75 is located on the distal end of the first stop portion 73. The distal end of the first drive portion 75 has a first guide surface 751. The proximal end of the first stop portion 73 has a first stop surface 731.

[0109] like Figure 5 As shown, a second driving part 41 is provided on the proximal side of the firing block 4. In this embodiment, the second driving part 41 is an extension arm extending from the bottom of the firing block 4 towards the proximal side, and the proximal side of the second driving part 41 of the firing block 4 has a second guide surface 411. Figure 6 As shown, the cutter 5 is an I-shaped cutter 5, including a first crossbeam 52, a second crossbeam 53, and a connecting part 54. The connecting part 54 connects the first crossbeam 52 and the second crossbeam 53. The distal end of the connecting part 54 is provided with a cutting edge 55 for cutting tissue. A second stop part 51 is provided on each side of the connecting part 54. The second stop part 51 is a protrusion protruding from the side wall of the connecting part 54, and the distal end of the second stop part 51 has a second stop surface 511. In an embodiment where only one first stop arm 7 is provided on the first connecting member 31, correspondingly, the number of second driving parts 41 is also one, and the number of second stop parts 51 is also one.

[0110] The first stop arm 7 has a first state and a second state. When the first stop arm 7 is in the first state, the first stop part 73 is at least partially located on the path of the second stop part 51 moving from the proximal side 22 to the distal side 21 of the staple cartridge 2. At this time, even if the firing handle is held, the cutter 5 cannot move to the distal side 21 of the staple cartridge 2 to fire the stapler, and the stapler is in a safe state. When the second drive unit 41 is located on the proximal side 22 of the staple cartridge 2, the second drive unit 41 cooperates with the first drive unit 75 to drive the first stop 73 to move away from the inner surface of the staple cartridge 2. The first stop arm 7 moves from the first state to the second state. At this time, the distal side 71 of the first stop arm 7 moves away from the staple cartridge 2, that is, moves upward, causing the first stop arm 7 to elastically deform. The first stop 73 moves away from the staple cartridge 2 and disengages from the path of the second stop 51 moving from the proximal side to the distal side of the staple cartridge 2. At this time, if the firing handle is held, the cutter 5 can move to the distal side and fire the stapler. Figure 3 As shown, in this embodiment, a concave first arc surface 721 is provided at the connection position between the upper surface of the proximal side 72 of the first stop arm 7 and the first connector 31. When the distal side 71 of the first stop arm 7 moves upward under the force of the firing block 4, the first arc surface 721 does not easily buffer the relative action between the proximal side 72 of the first stop arm 7 and the distal side of the first connector 31, thus preventing the first stop arm 7 from breaking at the proximal side. After the firing block 4 moves to the distal side and disengages from the first drive part 75, the first drive part 75 loses the driving force of the second drive part 41. Under the action of the elastic deformation recovery force of the first stop arm 7, the distal side 71 of the first stop arm 7 moves again towards the staple cartridge 2, and the first stop arm 7 returns to the first state.

[0111] Furthermore, to improve the stability of the stopping action of the first stop arm 7 on the cutter 5 in the first state, and to prevent the distal end 71 of the first stop arm 7 from being pushed upward by the force of the cutter 5, thus causing the safety to fail, as follows: Figure 3 and Figure 4 As shown, the first stop arm 7 is also provided with a third stop portion 74, and the distal end of the third stop portion 74 has a third stop surface 741. Figure 7 As shown, the inner side of the staple cartridge 2 is provided with at least one fourth stop 24. The fourth stop 24 is a protrusion protruding from the inner side of the staple cartridge 2, and the proximal end of the fourth stop 24 has a fourth stop surface 241 (in... Figure 10(As shown in the diagram). In this embodiment, the third stop surface 741 and the fourth stop surface 241 are vertical surfaces perpendicular to the inner surface of the staple cartridge 2. In other alternative embodiments, the third stop surface 741 and the fourth stop surface 241 may also be inclined surfaces forming a certain angle with the inner surface of the staple cartridge 2. When the first stop arm 7 is in the first state, the third stop portion 74 is located on the proximal side of the fourth stop portion 24, and the third stop portion 74 abuts against the fourth stop portion 24. Thus, when the first stop arm 7 is in the first state, even if the cutter 5 moves to the proximal side of the first stop portion 73, the second stop portion 51 exerts a force on the first stop portion 73 in the distal direction. Under the obstruction of the third stop portion 74 by the fourth stop portion 24, the distal side 71 of the first stop arm 7 will not be pushed and move in the distal direction, and therefore no upward movement component will be generated, resulting in safety failure.

[0112] In this embodiment, the first stop 73 is located on the path along which the second stop 51 moves from the proximal side 22 to the distal side 21 of the staple cartridge holder 2. This means that when the first stop arm 7 is in the first state, the distance between the lowest point of the first stop 73 and the inner surface of the staple cartridge holder 2 is less than the distance between the highest point of the second drive part 41 and the inner surface of the staple cartridge holder 2. When the second stop 51 of the cutter 5 moves to the position of the first stop 73, it will be blocked and unable to continue moving towards the distal side 21 of the staple cartridge holder 2. The first stop 73 moving away from the path along which the second stop 51 moves towards the distal side 21 of the staple cartridge holder 2 means that when the first stop arm 7 is in the second state, the distance between the lowest point of the first stop 73 and the inner surface of the staple cartridge holder 2 is greater than the distance between the highest point of the second drive part 41 and the inner surface of the staple cartridge holder 2. When the second stop 51 of the cutter 5 moves to the position of the first stop 73, it can pass through the gap between the lowest point of the first stop 73 and the inner surface of the staple cartridge 2, and continue to move toward the distal end 21 of the staple cartridge 2.

[0113] The following is combined with Figures 8-12 Describe in detail the structure of the stapling cartridge assembly in its initial state. For example... Figure 8 As shown, in the initial state, both the firing block 4 and the cutter 5 are located on the proximal side of the staple cartridge 2, and the cutter 5 is located in the first position. (This is defined here.) Figure 10 and Figure 11 From the perspective of S3, the above and below are what are described below as above and below. For example... Figure 10 and Figure 11As shown, at this time, the second driving part 41 on the proximal side of the firing block 4 enters between the first driving part 75 and the inner surface of the staple cartridge holder 2, driving the distal side 71 of the first stop arm 7 to move away from the inner surface of the staple cartridge holder 2, increasing the distance between the lowest point of the first stop part 73 and the inner surface of the staple cartridge holder 2, making the distance between the lowest point of the first stop part 73 and the inner surface of the staple cartridge holder 2 greater than the distance between the highest point of the second driving part 41 and the inner surface of the staple cartridge holder 2, and the first stop arm 7 is in the second state. The distal side of the first guide surface 751 is inclined upward compared to the proximal side, and the distal side of the second guide surface 411 is inclined upward compared to the proximal side. Through the cooperation of the first guide surface 751 and the second guide surface 411, the second driving part 41 of the firing block 4 can more easily enter between the first driving part 75 and the inner surface of the staple cartridge holder 2. Figure 10 As shown, when the first stop arm 7 is in the second state, the third stop portion 74 of the first stop arm 7 is also separated from the fourth stop portion 24 of the staple cartridge 2.

[0114] exist Figures 8-11 In the second state of the first stop arm 7 shown, when the firing handle is held, the cutter 5 can be driven to move to the distal end. The second stop part 51 of the cutter 5 passes through the gap in the height direction (S3 direction) formed between the lowest point of the first stop part 73 and the inner surface of the staple cartridge 2, and can move to the distal end of the staple cartridge 2. The cutter 5 drives the firing block 4 to move to the distal end to push out the staples, and the cutter 5 cuts the tissue to realize the firing of the stapler.

[0115] like Figures 9-11 As shown, the third stop portion 74 is located outside the first stop portion 73. Figure 12 As shown, to prevent the fourth stop portion 24 of the staple cartridge frame 2 from affecting the movement of the cutter 5 toward the distal end 21 of the staple cartridge frame 2 when the first stop arm 7 is in the second state, in this embodiment, the distance between the inner side of the fourth stop portion 24 (the side near the staple cartridge frame's tool path groove 23) and the centerline S4 of the staple cartridge frame 2 is greater than the distance between the outer side of the second stop portion 51 (the side away from the staple cartridge frame's tool path groove 23) and the centerline S4 of the staple cartridge frame 2. Figure 12 From the perspective of the second stop 51, it can move toward the far end of the staple cartridge 2 by passing through the lateral (along the S2 direction) gap between the fourth stop 24 and the center line S4 of the staple cartridge 2.

[0116] Furthermore, such as Figure 12As shown, to prevent the fourth stop 24 from obstructing the second drive portion 41 of the firing block 4, in this embodiment, the distance between the inner side of the fourth stop 24 and the center line S4 of the staple cartridge frame 2 is greater than the distance between the outer side of the first drive portion 75 and the center line S4 of the staple cartridge frame 2. Figure 12 From this perspective, the second drive unit 41 can pass through the lateral (along the S2 direction) gap between the fourth stop unit 24 and the center line S4 of the staple cartridge 2 and enter between the first drive unit 75 and the inner surface of the staple cartridge 2.

[0117] The following is combined with Figures 13-16 This section describes the structure of the stapler cartridge assembly when the fired stapler cartridge 1 has not been replaced after firing. For example... Figure 13 As shown, after the stapler is fired, the firing block 4 remains on the distal side of the stapler cartridge 2. The second drive unit 41 no longer acts on the first drive unit 75. After losing the lifting force of the second drive unit 41, the distal side 71 of the first stop arm 7 moves towards the stapler cartridge 2 under the action of the elastic deformation restoring force, causing the first stop arm 7 to return to the first state. At this time, the first stop part 73 and the second stop part 51 are aligned axially with the stapler.

[0118] like Figure 15 As shown, when the first stop arm 7 is in the first state, the second stop portion 51 and the fourth stop portion 24 are aligned axially with the stapler. The third stop surface 741 abuts against the fourth stop surface 241 to prevent the safety mechanism from failing if the second stop portion 51 moves to the first stop portion 73, causing an upward movement of the distal end 71 of the first stop arm 7. Figure 16 As shown, in this embodiment, the first stop surface 731 and the second stop surface 511 are vertical surfaces (perpendicular to the inner surface of the staple cartridge 2), which can obtain a stable mutual abutment structure.

[0119] like Figure 16As shown, when the first stop arm 7 is in the first state, there is a first gap between the lowest point of the first drive part 75 and the inner surface of the staple cartridge 2. However, the height of this first gap is less than the distance between the highest point of the second drive part 41 and the inner surface of the staple cartridge 2. That is, the distance between the lowest point of the first drive part 75 and the inner surface of the staple cartridge 2 is less than the distance between the highest point of the second drive part 41 and the inner surface of the staple cartridge 2. When the cutter 5 moves to the second position, the anvil 6 is in the fourth state, and the second stop part 51 of the cutter 5 abuts against the first stop part 73 of the first stop arm 7, preventing the cutter 5 from passing through the first gap. Specifically, the second stop surface 511 abuts against the first stop surface 731 to prevent the cutter 5 from moving towards the distal end 21 of the staple cartridge 2, thus preventing the stapler from being fired. In this embodiment, the first stop surface 731 and the second stop surface 511 are both vertical surfaces (perpendicular to the inner surface of the staple cartridge 2), which can provide a stable mutual abutment structure. A first stop mating surface 78 is also provided on the proximal side of the first stop surface 731, and the upper surface of the second stop portion 51 is a second stop mating surface 512. The first stop mating surface 78 and the second stop mating surface 512 are parallel to the axial direction. The first stop surface 731 is perpendicular to the first stop mating surface 78, and the second stop surface 51 is perpendicular to the second stop mating surface 512. When the first stop surface 731 abuts against the second stop surface 51, the first stop mating surface 78 can also abut against the second stop mating surface 512, or there can be a height gap between them.

[0120] like Figure 17 and Figure 18As shown, in this embodiment, the upper surface of the staple cartridge 1 is the staple cartridge surface 141. The staple cartridge 1 includes a staple cartridge body 14 and a staple cartridge cover 15 located outside the staple cartridge body 14. A first mating part 151 is provided on the side of the staple cartridge cover 15 away from the staple cartridge frame 2. The staple cartridge assembly also includes a second stop arm 8, which is located on the side of the first stop arm 7 away from the staple cartridge frame 2. The proximal end 82 of the second stop arm 8 is connected to the first connector 31, and a second mating part 81 is provided on the distal end of the second stop arm 8. The second mating part 81 is located on the side of the first mating part 151 away from the staple cartridge frame 2, and the second mating part 81 abuts against the first mating part 151. In this embodiment, there are two second stop arms 8, located on both sides of the staple cartridge feed groove 13 of the staple cartridge 1. Correspondingly, there are two first mating parts 151, which are formed by bending the two side walls of the staple cartridge cover 15 inward. The second stop arm 8 can provide a limiting function for the staple cartridge 1, preventing the staple cartridge 1 from falling out of the staple cartridge frame 2. Therefore, in this embodiment, two second stop arms 8 are provided on the upper part of the distal side of the first connector 31, and two first stop arms 7 are provided on the lower part. This can make good use of the space on the distal side of the first connector 31. Preferably, both the second stop arm 8 and the first stop arm 7 are integrally formed with the first connector 31, reducing the number of parts in the staple cartridge assembly and making the structure simpler and more effective. In an alternative embodiment, the second stop arm 8 can also be separately provided from the first connector 31, with the proximal side 82 of the second stop arm 8 fixed to the distal side of the first connector 31 by welding or other means.

[0121] like Figure 18 As shown, in this embodiment, the second stop arm 8 is at least partially elastic, facilitating the assembly of the staple cartridge 1 into the staple cartridge holder 2. The second stop arm 8 also includes an inclined section 84 and a second connecting section 83 located on the proximal side of the second mating portion 81. A second arcuate surface 821 is provided at the connection point between the proximal side of the second connecting section 83 and the first connecting member 31, preventing the second connecting section 83 from breaking at the proximal side. The distal side of the inclined section 84 is inclined upwards compared to the proximal side, so that the second mating portion 81 is located above the first mating portion 151. The upper surface of the first mating portion 151 has a first mating surface 1511, and the lower surface of the second mating portion 81 has a second mating surface 811. The first mating surface 1511 and the second mating surface 811 are preferably parallel to the plane of the staple cartridge surface 141.

[0122] like Figures 19-21The diagram shown is a structural schematic of the first connector 31 according to another embodiment of the present invention. The difference between this embodiment and the first embodiment is that the first stop arm 7 is only provided on the distal end of the first connector 31, and the second stop arm is not provided. The structure of the first stop arm 7 in this embodiment can adopt the structure described above. Figure 3 and Figure 4 The structure of the first stop arm 7 shown is a modified structure within the scope of this invention. The structures of the other components in the staple cartridge assembly (staple cartridge frame 2, cutter 5, firing block 4, staple cartridge 1) in this embodiment can adopt the structures described above. Figures 1-18 The structure shown, or a modified structure within the scope of this invention.

[0123] like Figures 22-24 The diagram shown is a structural schematic of the engagement of the first connector 31 and the cutter 5 in a staple cartridge assembly according to another embodiment of the present invention. This embodiment is similar to... Figures 1-18 The difference in the illustrated embodiment is that the first stop surface 731 and the second stop surface 511 form a certain angle with the axial direction. Specifically, an acute angle is formed between the first stop surface 731 and the first stop mating surface 78, and an acute angle is formed between the second stop surface 511 and the second stop mating surface 512. When the first stop surface 731 and the second stop surface 511 abut against each other, and the cutter 5 is driven by the push rod to exert a force on the first stop arm 7 in the distal direction, the first stop surface 731 is an inclined working surface, and its lower side is inclined towards the proximal direction compared to its upper side, making it less likely to be driven to move in the distal direction, thereby maintaining a more stable safety structure. The structures of other components, other structures of the cutter, and other structures of the first connector in this embodiment are similar to those in the previous embodiment. Figures 1-18 The embodiments shown are the same and will not be described again here.

[0124] Figures 1-24 In the illustrated embodiment, the connectors are each divided into a first connector 31 and a second connector 32, and the first stop arm 7 is disposed on the distal end of the first connector 31. In another alternative embodiment, the size of the second connector can be increased, the size of the first connector can be reduced, and the first stop arm can be disposed on the distal end of the second connector. In yet another alternative embodiment, the connectors can be configured as a single integral connector block, and the first stop arm 7 can be disposed on the distal end of this integral connector block. All of the above fall within the protection scope of this invention.

[0125] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A staple cartridge assembly, characterized in that, For use in medical staplers, the staple cartridge assembly includes: A staple cartridge rack and a staple cartridge housed within the staple cartridge rack; A connector, located on the proximal side of the staple cartridge frame, is used to connect the staple cartridge assembly to the instrument platform of the medical stapler; At least one first stop arm, the proximal end of the first stop arm being connected to the connector, and the distal end of the first stop arm being provided with a first stop portion and a first drive portion, the first stop arm including a first state and a second state; and A cutting blade, wherein the cutting blade is provided with a second stop; When the first drive unit is not subjected to external force, the first stop arm is in the first state, and the first stop part is at least partially located on the path of the second stop part moving from the proximal side to the distal side of the staple cartridge frame; when the first drive unit is driven to move the first stop part in the height direction away from the inner surface of the staple cartridge frame, the first stop arm enters the second state from the first state, and the second stop part can move towards the distal side of the staple cartridge frame through the height direction gap formed between the lowest point of the first stop part and the inner surface of the staple cartridge frame, and the side surface of the staple cartridge frame facing the bottom surface of the staple cartridge is the inner surface.

2. The staple cartridge assembly according to claim 1, characterized in that, It also includes a firing block, which is provided with a second driving part. When the second driving part is located on the proximal side of the staple cartridge frame, the second driving part cooperates with the first driving part to drive the first stop part to move away from the inner surface of the staple cartridge frame, and the first stop arm enters the second state from the first state.

3. The staple cartridge assembly according to claim 2, characterized in that, When the first stop arm is in the first state, the distance between the lowest point of the first stop part and the inner surface of the staple cartridge frame is less than the distance between the highest point of the second drive part and the inner surface of the staple cartridge frame. When the first stop arm is in the second state, the distance between the lowest point of the first stop part and the inner surface of the staple cartridge frame is greater than the distance between the highest point of the second drive part and the inner surface of the staple cartridge frame.

4. The staple cartridge assembly according to claim 3, characterized in that, When the first stop arm is in the first state, the distance between the lowest point of the first drive unit and the inner surface of the staple cartridge frame is less than the distance between the highest point of the second drive unit and the inner surface of the staple cartridge frame. When the second drive unit is located on the proximal side of the staple cartridge holder, the second drive unit enters between the first drive unit and the inner surface of the staple cartridge holder to drive the distal side of the first stop arm to move away from the inner surface of the staple cartridge holder.

5. The staple cartridge assembly according to claim 4, characterized in that, When the first stop arm is in the first state, there is a first gap between the lowest point of the first drive unit and the inner surface of the staple cartridge.

6. The staple cartridge assembly according to claim 3, characterized in that, The first stop portion has a first stop surface on its proximal side, and the second stop portion has a second stop surface on its distal side. When the first stop arm is in the first state and the second stop part moves to the proximal side of the first stop part, the second stop surface abuts against the first stop surface.

7. The staple cartridge assembly according to claim 6, characterized in that, The first stop surface and / or the second stop surface are vertical surfaces.

8. The staple cartridge assembly according to claim 6, characterized in that, The first stop surface is further provided with a first stop mating surface on its proximal side, and the second stop part is provided with a second stop mating surface on the side away from the inner surface of the staple cartridge. The first stop mating surface and the second stop mating surface are parallel to the axial direction. The first stop surface is perpendicular to the first stop mating surface, and the second stop surface is perpendicular to the second stop mating surface; or; An acute angle is formed between the first stop surface and the first stop mating surface, and an acute angle is formed between the second stop surface and the second stop mating surface.

9. The staple cartridge assembly according to claim 3, characterized in that, The distal end of the first stop arm is provided with a third stop portion, and the inner side of the staple cartridge is provided with at least one fourth stop portion. When the first stop arm is in the first state, the third stop portion is located on the proximal end of the fourth stop portion, and the third stop portion abuts against the fourth stop portion.

10. The staple cartridge assembly according to claim 9, characterized in that, The third stop portion has a vertical third stop surface at its distal end, and the fourth stop portion has a vertical fourth stop surface at its proximal end. When the first stop arm is in the first state, the third stop surface and the fourth stop surface abut against each other.

11. The staple cartridge assembly according to claim 9, characterized in that, The third stop is located outside the first stop. When the first stop arm is in the first state, the first stop and the second stop are aligned axially with the stapler, and the second stop and the fourth stop are aligned axially with the stapler.

12. The staple cartridge assembly according to claim 11, characterized in that, The distance between the inner side of the fourth stop and the center line of the staple cartridge frame is greater than the distance between the outer side of the second stop and the center line of the staple cartridge frame.

13. The staple cartridge assembly according to claim 11, characterized in that, The first drive unit is located at the far end of the first stop unit, and the distance between the inner side of the fourth stop unit and the center line of the staple cartridge frame is greater than the distance between the outer side of the first drive unit and the center line of the staple cartridge frame.

14. The staple cartridge assembly according to claim 2, characterized in that, The first driving unit has a first guide surface at its distal end, and / or the second driving unit has a second guide surface at its proximal end.

15. The staple cartridge assembly according to claim 2, characterized in that, The first stop arm is at least partially elastic, and when the first stop arm moves from the first state to the second state, the first stop arm undergoes elastic deformation. After the second drive unit moves toward the distal end of the staple cartridge and disengages from the first drive unit, the first stop arm moves from the second state to the first state under the action of the elastic deformation restoring force of the first stop arm.

16. The staple cartridge assembly according to claim 15, characterized in that, The first stop portion further includes a first connecting section and an arc-shaped transition section. The proximal end of the first connecting section is connected to the distal end of the connector, and the proximal end of the arc-shaped transition section is connected to the distal end of the first connecting section. The distal end of the arc-shaped transition section is provided with the first driving portion and the first stop portion.

17. The staple cartridge assembly according to claim 1, characterized in that, The first stop arm is located on the distal end of the connector, and the first stop arm is integrally formed with at least a portion of the connector.

18. The staple cartridge assembly according to claim 1, characterized in that, The connector includes a first connector and a second connector, the second connector being located below the first connector, and the first connector being integrally formed with the first stop arm.

19. The staple cartridge assembly according to claim 1, characterized in that, The upper surface of the proximal side of the first stop arm is provided with a concave first arc surface at the connection position with the connector.

20. The staple cartridge assembly according to claim 2, characterized in that, It includes two first stop arms, which are symmetrically arranged with respect to the center line of the staple cartridge assembly. The second stop portion is a protrusion provided on both sides of the cutter. Two second drive portions are provided on the proximal side of the firing block.

21. The staple cartridge assembly according to claim 2, characterized in that, The second drive unit is an extension arm that extends from the bottom of the firing block toward the proximal side.

22. The staple cartridge assembly according to claim 1, characterized in that, The stapler also includes an anvil disposed opposite the staple cartridge, the anvil having a third state open relative to the staple cartridge assembly and a fourth state closed relative to the staple cartridge assembly; The cutter includes a first position and a second position located on the proximal side of the staple cartridge, the first position being located on the proximal side of the second position; When the cutter is in the first position, the anvil is in the third state; when the cutter moves from the first position to the second position, the cutter drives the anvil into the fourth state. When the first stop arm is in the first state and the anvil is in the fourth state, the second stop portion of the cutter abuts against the first stop portion of the first stop arm.

23. The staple cartridge assembly according to claim 1, characterized in that, The staple cartridge is provided with a first mating part on the side away from the staple cartridge frame; The staple cartridge assembly further includes a second stop arm, which is located on the side of the first stop arm away from the staple cartridge frame. The proximal end of the second stop arm is connected to the connector, and the distal end of the second stop arm is provided with a second mating part. The second mating part is located on the side of the first mating part away from the staple cartridge frame, and the second mating part abuts against the first mating part.

24. The staple cartridge assembly according to claim 23, characterized in that, The second stop arm is integrally formed with at least a portion of the connecting member, and the second stop portion is at least partially elastic.

25. A medical stapler, characterized in that, Includes the staple cartridge assembly as described in any one of claims 1 to 24.

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