A surgical instrument, stapler and staple cartridge assembly

Abstract

The application discloses a surgical instrument, an anastomat and a staple cartridge assembly. The surgical instrument comprises a handle assembly, a barrel assembly, a staple cartridge assembly, a buckle and an executor assembly. The barrel assembly comprises a transmission mechanism. The staple cartridge assembly comprises a mounting seat, a pusher and a cutting knife. The mounting seat has a tissue contact surface for contacting with tissue. The pusher is movably arranged on the mounting seat. The cutting knife is movably connected with the mounting seat. The buckle has a connecting end and a free end. The connecting end of the buckle is connected with one of the staple cartridge assembly and the transmission mechanism. The other of the staple cartridge assembly and the transmission mechanism has a clamping portion. The transmission mechanism can drive the pusher and the cutting knife to move between the proximal end and the distal end of the mounting seat. The free end of the buckle can move close to and away from the plane where the tissue contact surface on the mounting seat is located, so as to realize clamping and unclamping with the clamping portion, thereby facilitating the reliability of combination and separation between the staple cartridge assembly and the transmission mechanism.

Description

Technical Field

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

[0002] Currently, minimally invasive surgery occupies an important position in surgical procedures, and the stapler is a commonly used surgical instrument in minimally invasive surgery. The working principle of the stapler is to clamp the jaws of the distal actuator at a specific position near the lesion, remove the tissue with the cutting blade of the distal actuator, and simultaneously suture it with the staple cartridge assembly of the distal actuator.

[0003] In existing staplers, the cutting blade of the distal actuator is usually fixedly connected to the drive unit. Therefore, the cutting blade cannot be replaced when the staple cartridge assembly is replaced. The repeated use of the cutting blade will reduce its sharpness, thereby reducing the quality of the surgery and bringing certain medical risks. Summary of the Invention

[0004] The main technical problem solved by this invention is that existing staplers cannot replace the cutting blade when replacing the staple cartridge assembly. The repeated use of the cutting blade will reduce its sharpness, thereby reducing the quality of surgery.

[0005] In a first aspect, one embodiment provides a surgical instrument, comprising:

[0006] Handle assembly;

[0007] A barrel assembly, the proximal end of which is connected to a handle assembly, the barrel assembly including a transmission mechanism;

[0008] A staple cartridge assembly includes a mounting base, a staple pusher, and a cutting blade. The mounting base has multiple mounting positions for mounting staples and a tissue-contacting surface for contacting tissue. The staple pusher is movably mounted on the mounting base, and the cutting blade is movably connected to the mounting base. The staple pusher and the cutting blade are movable between the proximal and distal ends of the mounting base.

[0009] A fastener having a connecting end and a free end, the connecting end of the fastener being connected to one of a staple cartridge assembly and a transmission mechanism, the other of which has a snap-fit ​​portion;

[0010] The actuator assembly includes a first jaw and a second jaw, the first jaw and the second jaw being movably connected and capable of relative movement to achieve closing and opening; a mounting cavity is formed between the first jaw and the second jaw, the staple cartridge assembly is disposed in the mounting cavity, and the distal end of the transmission mechanism extends into the mounting cavity.

[0011] The transmission mechanism can drive the pusher and the cutting blade to move between the proximal and distal ends of the mounting base; the free end of the latching member can move closer to and further away from the plane containing the tissue interface on the mounting base to achieve engagement and disengagement with the latching part.

[0012] In one embodiment, the connecting end of the buckle is connected to the cutting blade.

[0013] In one embodiment, the cutting blade and the fastener are an integral structure.

[0014] In one embodiment, the connecting end of the snap fastener is connected to the push pin.

[0015] In one embodiment, the push pin and the snap fastener are an integral structure.

[0016] In one embodiment, at least a portion of the latching member is an elastic structure, the first jaw has a latching guide surface, and when the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the distal end of the actuator assembly, the latching guide surface abuts against the latching member, causing the latching member to deform and drive the free end of the latching member to move closer to the plane where the tissue bonding surface is located on the mounting base, so as to achieve latching with the latching part; when the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the proximal end of the actuator assembly, the latching member, under the action of the elastic restoring force of the elastic structure, drives the free end of the latching member to move away from the plane where the tissue bonding surface is located on the mounting base, so as to achieve disengagement from the latching part.

[0017] In one embodiment, the entire fastener is made of an elastic material.

[0018] In one embodiment, the snap-fit ​​portion is configured as a snap-fit ​​groove, the free end of the snap fastener has a fastening portion, the snap-fit ​​groove includes a positioning portion and a guide portion, and the fastening portion is movable along the guide portion to engage or disengage from the positioning portion.

[0019] In one embodiment, the proximal end of the mounting base has a disengagement guide surface. When the transmission mechanism drives the pusher and the cutting blade to move toward the proximal end of the actuator assembly, the disengagement guide surface can abut against the snap-fit ​​member to drive the engaging portion to disengage from the positioning portion.

[0020] In one embodiment, the free end of the fastener moves toward and away from the plane containing the tissue bonding surface in a direction perpendicular to the tissue bonding surface.

[0021] In one embodiment, the mounting base has a movable cavity arranged along its axial direction, and the pusher and the cutter are movably disposed within the movable cavity.

[0022] In one embodiment, the mounting base has a support portion located on the side of the movable cavity opposite to the mounting position, for supporting the pusher and the cutting blade.

[0023] In one embodiment, the proximal end of the mounting base has a limiting portion for preventing the pusher and the cutter from disengaging from the proximal end of the mounting base into the movable cavity.

[0024] In one embodiment, the actuator assembly has a locking portion for locking with the transmission mechanism to prevent the transmission mechanism from moving axially along the actuator assembly; the transmission mechanism has a first unlocking portion, and the staple cartridge assembly has a second unlocking portion; when the staple cartridge assembly is installed in the mounting cavity, the first unlocking portion cooperates with the second unlocking portion to unlock the locking portion from the transmission mechanism; when the locking portion is unlocked from the transmission mechanism, the transmission mechanism can drive the staple pusher and the cutting blade to move from the proximal end to the distal end of the mounting base.

[0025] In one embodiment, the locking part abuts against the distal end of the transmission mechanism to lock with the transmission mechanism; when the staple cartridge assembly is correctly installed in the mounting cavity, the first unlocking part contacts the second unlocking part to drive the distal end of the transmission mechanism away from the locking part, thereby unlocking with the transmission mechanism.

[0026] In one embodiment, the first unlocking part is configured as a protrusion extending toward the staple cartridge assembly, and the second unlocking part is configured as an unlocking groove. The protrusion has a first unlocking guide surface, and the unlocking groove has a second unlocking guide surface. When the protrusion is inserted into the unlocking groove, the first unlocking guide surface contacts the second unlocking guide surface to drive the transmission mechanism to disengage from the locking part.

[0027] Secondly, one embodiment provides a stapler, comprising:

[0028] Handle assembly;

[0029] A barrel assembly, the proximal end of which is connected to a handle assembly, the barrel assembly including a transmission mechanism;

[0030] The actuator assembly includes a first jaw and a second jaw, the first jaw and the second jaw being movably connected, the first jaw and the second jaw being capable of relative movement to achieve closing and opening; a mounting cavity for mounting a staple cartridge assembly is formed between the first jaw and the second jaw, and the transmission mechanism extends into the mounting cavity.

[0031] The transmission mechanism is used to drive the staple pusher and the cutting blade of the staple cartridge assembly to move between the proximal and distal ends of the mounting base; the transmission mechanism has a locking part for engaging and disengaging with the latching part of the staple cartridge assembly along the movement path of the plane containing the tissue interface on the mounting base.

[0032] In one embodiment, the snap-fit ​​portion is configured as a snap-fit ​​groove, the snap-fit ​​groove including a positioning portion and a guide portion, the guide portion being used to guide the snap-fit ​​portion of the free end of the snap fastener to engage with or disengage from the positioning portion.

[0033] Thirdly, one embodiment provides a stapling cartridge assembly, including:

[0034] Mounting base, the mounting base having a plurality of mounting positions for mounting suture staples, the mounting base having a tissue-contacting surface for contacting tissue;

[0035] A pusher pin, the pusher pin being movably disposed on the mounting base; and

[0036] A cutting blade connected to the mounting base, the pusher and the cutting blade being movable between the proximal and distal ends of the mounting base; and

[0037] The fastener has a connecting end and a free end. The free end of the fastener can move closer to and further away from the plane where the tissue mating surface is located on the mounting base, so as to achieve engagement and disengagement with the engagement part of the transmission mechanism.

[0038] In one embodiment, the connecting end of the buckle is connected to the cutting blade.

[0039] In one embodiment, the cutting blade and the fastener are an integral structure.

[0040] In one embodiment, the connecting end of the snap fastener is connected to the push pin.

[0041] In one embodiment, the push pin and the snap fastener are an integral structure.

[0042] In one embodiment, at least a portion of the latching member is an elastic structure, and the first jaw has a latching guide surface. When the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the distal end of the actuator assembly, the latching guide surface abuts against the latching member, causing the latching member to deform and move its free end closer to the plane containing the tissue bonding surface on the mounting base, thereby achieving latching with the latching part. When the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the proximal end of the actuator assembly, the latching member recovers its deformation under the elastic restoring force of the elastic structure, and moves its free end away from the plane containing the tissue bonding surface on the mounting base, thereby achieving disengagement from the latching part.

[0043] In one embodiment, the entire fastener is made of an elastic material.

[0044] In one embodiment, the proximal end of the mounting base has a disengagement guide surface, and the end of the latching member facing the transmission mechanism has a fastening portion. When the transmission mechanism drives the pusher and the cutting blade to move toward the proximal end of the actuator assembly, the disengagement guide surface abuts against the latching member, thereby causing the fastening portion to disengage from the latching portion of the transmission mechanism.

[0045] In one embodiment, the free end of the fastener moves toward and away from the plane containing the tissue bonding surface in a direction perpendicular to the tissue bonding surface.

[0046] In one embodiment, the mounting base has a movable cavity arranged along the axial direction, and the pusher and the cutter are movably disposed within the movable cavity.

[0047] In one embodiment, the mounting base has a support portion located on the side of the movable cavity opposite to the mounting position, for supporting the pusher and the cutting blade.

[0048] In one embodiment, the proximal end of the mounting base has a limiting portion for preventing the pusher and the cutter from disengaging from the proximal end of the mounting base into the movable cavity.

[0049] Fourthly, one embodiment provides a stapler, comprising:

[0050] Handle assembly;

[0051] A barrel assembly, the proximal end of which is connected to a handle assembly, the barrel assembly including a transmission mechanism;

[0052] The actuator assembly includes a first jaw and a second jaw, the first jaw and the second jaw being movably connected, and the first jaw and the second jaw being movable relative to each other to achieve closing and opening; a mounting cavity for mounting a staple cartridge assembly is formed between the first jaw and the second jaw, and a transmission mechanism extends into the mounting cavity; the transmission mechanism's staple pusher and cutting blade move between the proximal and distal ends of the mounting base; and

[0053] The fastener has a connecting end and a free end. The connecting end of the fastener is disposed on the transmission mechanism. The free end of the fastener can move closer to and further away from the plane where the tissue mating surface is located on the mounting base, so as to realize the engagement and disengagement with the engagement part of the staple cartridge assembly.

[0054] In one embodiment, the connecting end of the buckle is connected to the far end of the transmission mechanism.

[0055] In one embodiment, the buckle and the transmission mechanism are an integral structure.

[0056] Fifthly, in one embodiment, a staple cartridge assembly is provided, comprising:

[0057] Mounting base, the mounting base having a plurality of mounting positions for mounting suture staples, the mounting base having a tissue-contacting surface for contacting tissue;

[0058] A pusher pin, the pusher pin being movably disposed on the mounting base; and

[0059] A cutting blade connected to the mounting base, the pusher and the cutting blade being movable between the proximal and distal ends of the mounting base; and

[0060] The snap-fit ​​part is disposed on the pusher or the cutter, and the snap-fit ​​part is used to engage and disengage with the snap fastener of the stapler along the movement path of the plane where the tissue interface surface on the mounting base is located, which is close to and far away from the stapler.

[0061] In one embodiment, the snap-fit ​​portion is connected to the cutting blade.

[0062] In one embodiment, the snap-fit ​​portion and the cutting blade are an integral structure.

[0063] In one embodiment, the snap-fit ​​portion is connected to the push pin member.

[0064] In one embodiment, the snap-fit ​​portion and the push pin are an integral structure.

[0065] The surgical instruments, stapler, and staple cartridge assembly according to the above embodiments offer several advantages. Firstly, since the cutting blade is mounted on the mounting base of the staple cartridge assembly, the cutting blade is replaced simultaneously with each replacement of the staple cartridge assembly, thus mitigating the medical risks associated with decreased blade sharpness. Secondly, the addition of a locking member and a locking part allows for engagement between the staple cartridge assembly and the transmission mechanism. Moving the locking member towards the plane containing the tissue-interaction surface on the mounting base allows for disengagement from the locking part, thereby disengaging the staple cartridge assembly from the transmission mechanism and improving the reliability of the engagement and disengagement between the staple cartridge assembly and the transmission mechanism. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of the structure of a surgical instrument in one embodiment of this application;

[0067] Figure 2 This is a cross-sectional schematic diagram of the staple cartridge assembly in one embodiment of this application;

[0068] Figure 3 This is a schematic diagram of the stapling cartridge assembly from a stereoscopic perspective in one embodiment of this application;

[0069] Figure 4 This is a schematic diagram of the actuator assembly and drive mechanism in one embodiment of this application;

[0070] Figure 5 This is a schematic diagram of the structure for preparing the transmission mechanism and the cutting blade to cooperate and unlock in one embodiment of this application;

[0071] Figure 6 For this application Figure 5 Enlarged view of point A in the middle;

[0072] Figure 7 This is a schematic diagram of the structure of the transmission mechanism and the cutting blade after unlocking and firing in one embodiment of this application;

[0073] Figure 8 For this application Figure 7 Enlarged view of point B in the middle;

[0074] Figure 9 This is a schematic diagram of the structure of the transmission mechanism and the cutting blade in one embodiment of this application, showing their separation after retraction.

[0075] Figure 10 For this application Figure 9 Enlarged view of point C in the middle;

[0076] Figure 11 This is a schematic diagram of the structure in which the transmission mechanism and the locking part are locked in one embodiment of this application;

[0077] Figure 12 For this application Figure 11 Enlarged view of point D in the middle;

[0078] Figure 13 This is a schematic diagram of the structure of the transmission mechanism continuing to move towards the proximal end after separating from the cutting blade in one embodiment of this application;

[0079] Figure 14 For this application Figure 13 Enlarged view at point E in the middle;

[0080] Figure 15 This application provides a cross-sectional view of the staple cartridge assembly detached from the guide surface in one embodiment of the present application.

[0081] Figure 16 For this application Figure 15 Enlarged view at point F;

[0082] Figure 17 This is a cross-sectional schematic diagram of the latching member of the staple cartridge assembly in one embodiment of this application, showing the state of contact between the latching member and the guide surface.

[0083] Figure 18 For this application Figure 17 Enlarged view of point G in the middle;

[0084] Figure 19 This is a cross-sectional view of the actuator assembly and drive mechanism in another embodiment of this application;

[0085] Figure 20 For this application Figure 19 Enlarged view of section H in the middle;

[0086] Reference numerals: 100, handle assembly; 110, fixed handle; 120, movable handle; 200, barrel assembly; 210, transmission mechanism; 211, first unlocking part; 2111, protrusion; 2112, first unlocking guide surface; 212, mating groove; 213, mating part; 214, driving part; 215, protruding structure; 216, snap-fit ​​part; 2161, snap-fit ​​groove; 2162, positioning part; 2163, guide part; 300, actuator assembly; 310, first... 320. First jaw; 330. Second jaw; 340. Locking part; 400. Locking spring; 410. Attachment cartridge assembly; 411. Mounting base; 412. Snap-fit ​​guide surface; 413. Tissue bonding surface; 414. Movable cavity; 415. Support part; 416. Limiting part; 420. Attachment pusher; 430. Cutting blade; 440. Second unlocking part; 441. Unlocking groove; 442. Second unlocking guide surface; 450. Snap fastener; 451. Snap-fit ​​part. Detailed Implementation

[0087] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0088] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0089] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0090] Anastomosing devices are commonly used surgical instruments in minimally invasive surgery. Please refer to [link / reference]. Figure 1 The stapler typically includes a handle assembly 100, a barrel assembly 200, and an actuator assembly 300. The barrel assembly 200 includes a closing drive chain and a firing drive chain. The handle assembly 100 includes a fixed handle 110 and at least one movable handle 120.

[0091] When operating the stapler, the operator can hold the fixed handle 110 and insert the actuator assembly 300 into the lesion site inside the body through the slender barrel assembly 200. Then, the movable handle 120 triggers the closing drive chain, causing the jaws of the actuator assembly 300 to close and clamp at a specific position near the lesion site. Next, the movable handle 120 triggers the firing drive chain, causing the cutting blade 430 within the actuator assembly 300 to remove tissue, and simultaneously suturing the tissue using the suture staples within the actuator assembly 300.

[0092] In this embodiment, "distal" refers to the end of the surgical instrument furthest from the operator, and "proximal" refers to the end of the surgical instrument closest to the operator. In this embodiment, "axial" refers to the direction of the line connecting the center of the distal end and the center of the proximal end, and "radial" refers to the direction perpendicular to the axial direction.

[0093] This embodiment provides a surgical instrument.

[0094] Please refer to Figure 1-14 The surgical instrument includes a handle assembly 100, a barrel assembly 200, a staple cartridge assembly 400, a locking element 450, and an actuator assembly 300.

[0095] The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The staple cartridge assembly 400 includes a mounting base 410, a staple pusher 420, and a cutting blade 430. The mounting base 410 has multiple mounting positions for mounting staples and a tissue-contacting surface 412 for contact with tissue. The staple pusher 420 is movably mounted on the mounting base 410, and the cutting blade 430 is movably connected to the mounting base 410. The staple pusher 420 and the cutting blade 430 are movable between the proximal and distal ends of the mounting base 410. A locking member 450 has a connecting end and a free end. The connecting end of the locking member 450 is connected to one of the staple cartridge assembly 400 and the transmission mechanism 210, and the other of the staple cartridge assembly 400 and the transmission mechanism 210 has a locking portion 216.

[0096] The distal end of the barrel assembly 200 is connected to the actuator assembly 300, which includes a first jaw 310 and a second jaw 320. The first jaw 310 and the second jaw 320 are movably connected and can move relative to each other to achieve closing and opening. A mounting cavity is formed between the first jaw 310 and the second jaw 320, and the staple cartridge assembly 400 is disposed in the mounting cavity. The distal end of the transmission mechanism 210 extends into the mounting cavity.

[0097] The transmission mechanism 210 can drive the pusher 420 and the cutter 430 to move between the proximal and distal ends of the mounting base 410. The free end of the latch 450 can move closer to and further away from the plane containing the tissue mating surface 412 on the mounting base 410 to achieve engagement and disengagement with the latching part 216.

[0098] It should be noted that the tissue engagement surface 412 of the mounting base 410 refers to the side of the mounting base 410 that contacts the tissue being held when the tissue is clamped. It is understood that during tissue suturing, the suture staples are pushed out from the tissue engagement surface 412 of the mounting base 410 to achieve tissue suturing.

[0099] On the one hand, since the cutting blade 430 is mounted on the mounting base 410 of the staple cartridge assembly 400, the cutting blade 430 is replaced simultaneously each time the staple cartridge assembly 400 is replaced, thus helping to avoid the medical risks caused by the decrease in the sharpness of the cutting blade 430. On the other hand, due to the addition of the latching member 450 and the engaging part 216, the latching member 450 can be moved closer to the plane containing the tissue interface surface 412 on the mounting base 410 to engage with the engaging part 216, thereby achieving the engagement between the staple cartridge assembly 400 and the transmission mechanism 210. By moving the latching member 450 away from the plane containing the tissue interface surface 412 on the mounting base 410, the engagement with the engaging part 216 can be released, thereby achieving the release of the staple cartridge assembly 400 from the transmission mechanism 210, thus improving the reliability of the engagement and disengagement between the staple cartridge assembly 400 and the transmission mechanism 210.

[0100] Please refer to Figure 4-12 In practical applications, after the staple cartridge assembly 400 is installed into the mounting cavity, there is a certain distance between the first unlocking part 211 on the transmission mechanism 210 and the second unlocking part 440 on the cutting blade 430. Please refer to... Figure 6 and 8 After the operator fires, the transmission mechanism 210 moves distally, engaging the first unlocking part 211 with the second unlocking part 440, and engaging the latching part 450 with the engaging part 216. The transmission mechanism 210 then pushes the cutting blade 430 and the pusher 420 distally to complete firing. After firing, the transmission mechanism 210 drives the cutting blade 430 proximally to reach the end of the transmission mechanism. Figure 10 When positioned, the latching member 450 separates from the latching part 216 under its own elastic force, the transmission mechanism 210 separates from the cutting blade 430, and the transmission mechanism 210 continues to move until... Figure 14 The position within. For example... Figure 12 As shown, when the staple cartridge assembly 400 is not installed in the mounting cavity, or when the cutting blade 430 of the staple cartridge assembly 400 is not in its initial position, if the operator performs another firing operation, the transmission mechanism 210 moves to the distal end. Since the first unlocking part 211 and the second unlocking part 440 are not engaged at this time, under the elastic force of the locking spring 340, the transmission mechanism 210 and the locking part 330 come into contact, and the safety is activated.

[0101] It should be noted that the staple cartridge assembly 400 can be considered as part of the actuator assembly 300. For example, the staple cartridge assembly 400 can be fixedly connected to the first jaw 310 or the second jaw 320 or form an integral structure. The staple cartridge assembly 400 can also be considered as a component independent of the actuator assembly 300. For example, the staple cartridge assembly 400 can be detachably installed on the first jaw 310 or the second jaw 320, thereby making the staple cartridge assembly 400 a consumable used in the actuator assembly 300.

[0102] It is understood that when the staple cartridge assembly 400 is regarded as a consumable applied to the actuator assembly 300, and the fastener 450 is located in the staple cartridge assembly 400, this embodiment provides a stapler.

[0103] Please refer to Figure 4-12 The stapler includes a handle assembly 100, a barrel assembly 200, and an actuator assembly 300.

[0104] The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The distal end of the barrel assembly 200 is connected to the actuator assembly 300, which includes a first jaw 310 and a second jaw 320. The first jaw 310 and the second jaw 320 are movably connected and can move relative to each other to achieve closing and opening. A mounting cavity for mounting the staple cartridge assembly 400 is formed between the first jaw 310 and the second jaw 320, and the transmission mechanism 210 extends into the mounting cavity.

[0105] The transmission mechanism 210 is used to drive the staple pusher 420 and the cutting blade 430 of the staple cartridge assembly 400 to move between the proximal and distal ends of the mounting base 410. The transmission mechanism 210 has a locking part 216 for engaging and disengaging with the latching member 450 of the staple cartridge assembly 400 along a movement path close to and away from the plane containing the tissue contact surface 412 on the mounting base 410.

[0106] This embodiment also provides a staple cartridge assembly 400.

[0107] Please refer to Figure 1-3 7 and 8, the staple cartridge assembly 400 includes a mounting base 410, a staple pusher 420, a cutting blade 430, and a snap fastener 450.

[0108] The mounting base 410 has multiple mounting positions for mounting suture staples and a tissue-contacting surface 412 for contacting tissue. The staple pusher 420 is movably mounted on the mounting base 410, and the cutting blade 430 is connected to the mounting base 410. The staple pusher 420 and the cutting blade 430 are movable between the proximal and distal ends of the mounting base 410. The locking member 450 has a connecting end and a free end. The free end of the locking member 450 is movable towards and away from the plane containing the tissue-contacting surface 412 on the mounting base 410 to achieve engagement and disengagement with the locking portion 216 of the transmission mechanism 210.

[0109] Please refer to Figure 1-6 In one embodiment, the connecting end of the snap fastener 450 is connected to the cutting blade 430.

[0110] Since the connecting end of the latching member 450 is connected to the cutting blade 430, when the latching member 450 is engaged with the engaging part 216, the cutting blade 430 and the transmission mechanism 210 can be tightly matched, allowing the transmission mechanism 210 to drive the cutting blade 430 more stably, thereby improving the reliability of the cutting action of the cutting blade 430. When the latching member 450 is disengaged from the engaging part 216, the transmission mechanism 210 can separate from the cutting blade 430 to complete the retraction action of the cutting blade 430. In other embodiments, the connecting end of the latching member 450 can also be connected to the pusher member 420.

[0111] Please refer to Figure 1-6 In one embodiment, the cutting blade 430 and the fastener 450 are an integral structure.

[0112] On the one hand, by designing the cutting blade 430 and the locking member 450 as an integral structure, the assembly steps of the cutting blade 430 and the locking member 450 are reduced, thereby simplifying the assembly process of surgical instruments. On the other hand, it avoids the risk of the locking member 450 detaching from the cutting blade 430 due to insufficient connection between the locking member 450 and the cutting blade 430. In other embodiments, the locking member 450 may also be an integral structure with the pusher member 420.

[0113] Please refer to Figure 7 and 8 In one embodiment, at least a portion of the latching member 450 is an elastic structure. The first jaw 310 has a latching guide surface 411. When the transmission mechanism 210 drives the pusher 420 and the cutter 430 to move along the latching guide surface 411 toward the distal end of the actuator assembly 300, the latching guide surface 411 abuts against the latching member 450, causing the latching member 450 to deform and move its free end toward the plane containing the tissue bonding surface 412 on the mounting base 410, thereby achieving latching with the latching part 216. When the transmission mechanism 210 drives the pusher 420 and the cutter 430 to move along the latching guide surface 411 toward the proximal end of the actuator assembly 300, the latching member 450, under the action of the elastic restoring force of the elastic structure, moves its free end away from the plane containing the tissue bonding surface 412 on the mounting base 410, thereby achieving disengagement from the latching part 216.

[0114] This allows the operator to automatically engage and disengage the latching member 450 with the latching part 216 simply by moving the pusher member 420 and the cutting blade 430 towards the far and near ends of the actuator assembly 300 via the transmission mechanism 210, without requiring any additional operation from the operator. This simplifies the operator's work. Specifically, the latching member 450 can be made entirely of elastic material.

[0115] In other embodiments, the latching member 450 can also be a rigid structure. For example, the latching member 450 is a rigid rod, with its connecting end rotatably connected to the cutting blade 430. When the latching guide surface 411 abuts against the latching member 450, it drives the free end of the latching member 450 to rotate closer to the plane containing the tissue mating surface 412 on the mounting base 410, thereby achieving latching with the latching part 216. A torsion spring can be provided at the end of the latching member 450 that is rotatably connected to the cutting blade 430. The torsion spring drives the free end of the latching member 450 to rotate away from the plane containing the tissue mating surface 412 on the mounting base 410, thereby achieving disengagement from the latching part 216.

[0116] Please refer to Figure 1-3 In one embodiment, the snap-fit ​​portion 216 is configured as a snap-fit ​​groove 2161, the free end of the snap fastener 450 has a fastening portion 451, the snap-fit ​​groove 2161 includes a positioning portion 2162 and a guide portion 2163, and the fastening portion 451 is movable along the guide portion 2163 to engage or disengage from the positioning portion 2162.

[0117] On the one hand, the engaging part 216 employs an engaging groove 2161, which allows for engagement and disengagement with the fastener 450 through a simple structure. Furthermore, the engaging groove 2161 can be directly mounted on existing components; for example, it can be mounted on the transmission mechanism 210 without requiring additional parts. On the other hand, the guide part 2163 of the engaging groove 2161 guides the engaging part 451 of the fastener 450 to engage with or disengage from the positioning part 2162, improving the reliability of the engagement and disengagement process between the fastener 450 and the engaging groove 2161. In other embodiments, various hole structures and recessed structures can be used to replace the engaging groove 2161.

[0118] Please refer to Figure 15-18 In one embodiment, the proximal end of the mounting base 410 has a disengagement guide surface 416. When the transmission mechanism 210 drives the pusher 420 and the cutter 430 to move toward the proximal end of the actuator assembly 300, the disengagement guide surface 416 can abut against the latching member 450 to drive the free end of the latching member 450 to disengage from the latching portion 216.

[0119] The disengagement guide surface 416 serves as a safety feature for the locking member 450 to disengage from the engaging portion 216. Specifically, when the pusher 420 and the cutter 430 move towards the proximal end of the actuator assembly 300, they first pass through the engaging guide surface 411 and then move to the disengagement guide surface 416. The meaning of "may" the disengagement guide surface 416 abut against the locking member 450 is that when the pusher 420 and the cutter 430 move towards the proximal end of the actuator assembly 300 to the engaging guide surface 411, if the locking member 450 can disengage from the engaging portion 216 under the action of its own elastic restoring force, then the disengagement guide surface 416 will not abut against the locking member 450. If the elastic structure of the fastener 450 fails or the elastic force is insufficient, and the free end of the fastener 450 cannot be disengaged from the locking part 216, then when the pusher 420 and the cutter 430 pass through the disengagement guide surface 416, the disengagement guide surface 416 abuts against the fastener 450, and the free end of the fastener 450 is disengaged from the locking part 216.

[0120] Please refer to Figure 1-3 In one embodiment, the free end of the latching member 450 moves toward and away from the plane containing the tissue bonding surface 412 in a direction perpendicular to the tissue bonding surface 412. Because the direction of movement of the free end of the latching member 450 is perpendicular to the tissue bonding surface 412 on the mounting base 410, the movement of the latching member 450 does not interfere with the movement of the pusher 420 and the cutter 430 between the proximal and distal ends of the mounting base 410.

[0121] Please refer to Figure 1-3 In one embodiment, the mounting base 410 has a movable cavity 413 disposed along its axial direction, within which a pusher 420 and a cutter 430 are movably disposed. The movable cavity 413 defines the direction of movement of the pusher 420 and the cutter 430, ensuring that the pusher and cutter can move between the proximal and distal ends of the mounting base 410 along the axial direction of the mounting base.

[0122] Please refer to Figure 1-3 In one embodiment, the mounting base 410 has a support portion 414 located on the side of the movable cavity 413 opposite to the mounting position, for supporting the pusher 420 and the cutter 430. The support portion 414 prevents the pusher 420 and the cutter 430 from disengaging from the side of the mounting base 410 opposite to the mounting position from the movable cavity 413.

[0123] Please refer to Figure 1-3 In one embodiment, the proximal end of the mounting base 410 has a limiting portion 415 for preventing the pusher 420 and the cutter 430 from disengaging from the proximal end of the mounting base 410 into the movable cavity 413. The limiting portion 415 prevents the pusher and the cutter 430 from disengaging from the proximal end of the mounting base 410 into the movable cavity 413.

[0124] Please refer to Figure 4-6 In one embodiment, as described in 9-14, the actuator assembly 300 has a locking portion 330 for locking with the transmission mechanism 210 to prevent the transmission mechanism 210 from moving axially along the actuator assembly 300. The transmission mechanism 210 has a first unlocking portion 211, and the staple cartridge assembly 400 has a second unlocking portion 440. When the staple cartridge assembly 400 is installed in the mounting cavity, the first unlocking portion 211 engages with the second unlocking portion 440 to unlock the locking portion 330 from the transmission mechanism 210. When the locking portion 330 is unlocked from the transmission mechanism 210, the transmission mechanism 210 can drive the staple pusher 420 and the cutting blade 430 from the proximal end to the distal end of the mounting base 410.

[0125] Since the transmission mechanism 210 is locked by the locking part 330 on the actuator assembly 300 and unlocked by the first unlocking part 211 on the transmission mechanism 210 and the second unlocking part 440 on the staple cartridge assembly 400, the safety function can be achieved by adding features to the existing parts without adding a complex safety card and spring drive structure. This helps to improve the reliability of the safety function and avoids the risk of the safety card falling into the human body after failure.

[0126] Please refer to Figure 4-6 In one embodiment, as described in 9-14, the locking part 330 abuts against the distal end of the transmission mechanism 210 to achieve locking with the transmission mechanism 210. When the staple cartridge assembly 400 is correctly installed in the mounting cavity, the first unlocking part 211 contacts the second unlocking part 440 to drive the distal end of the transmission mechanism 210 away from the locking part 330, thereby unlocking with the transmission mechanism 210.

[0127] Locking or unlocking of the locking part 330 and the transmission mechanism 210 is achieved by the locking part 330 abutting or disengaging from the distal end of the transmission mechanism 210. The advantage of this locking method is its simplicity and directness, allowing for a simpler structural design of the locking part 330 and the transmission mechanism 210, eliminating the need for additional complex components, and thus increasing the reliability of the locking and unlocking process. Of course, in other embodiments, damping locking, electromagnetic locking, or other suitable locking methods can replace the locking method in this embodiment.

[0128] Please refer to Figure 11-14 In one embodiment, the locking portion 330 extends along a direction perpendicular to the line connecting the distal and proximal ends of the actuator assembly 300.

[0129] By moving the transmission mechanism 210 along a direction perpendicular to the line connecting the distal and proximal ends of the actuator assembly 300, it can achieve contact and disengagement with the locking part 330. Since the locking and unlocking directions of the transmission mechanism 210 are perpendicular to the direction of the transmission mechanism 210 firing the cutting blade 430, the locking and unlocking actions of the transmission mechanism 210 will not interfere with the firing action of the transmission mechanism 210.

[0130] Please refer to Figure 5-8 In one embodiment, the actuator assembly 300 further includes a locking spring 340 located on the movement path of the transmission mechanism 210, and the elastic restoring force of the locking spring 340 is used to drive the transmission mechanism 210 to move to lock with the locking part 330.

[0131] When the actuator assembly 300 moves towards the proximal end to the position of the locking part 330, the transmission mechanism 210 can be driven to move and lock with the locking part 330 by the elastic restoring force of the locking spring 340. Specifically, in this embodiment, the elastic restoring force of the locking spring 340 can be set to be perpendicular to the direction of the line connecting the distal and proximal ends of the actuator assembly 300. In other embodiments, a spring, elastic block, or other suitable elastic element can be used to replace the locking spring 340.

[0132] Please refer to Figure 5-8 In one embodiment, the transmission mechanism 210 includes a mating member 213 and a driving member 214. A first unlocking part 211 is located on the side of the mating member 213 facing the staple cartridge assembly 400. The driving member 214 is connected to the mating member 213 and has a protruding structure 215 extending away from the mating member 213. The locking spring 340 can abut against the protruding structure 215.

[0133] The mating member 213 is used to engage with the staple cartridge assembly 400 or the locking part 330. The driving member 214 pushes the mating member 213 from the proximal end to the distal end of the actuator assembly 300. The elastic restoring force of the locking spring 340 acts on the protruding structure 215 to drive the driving member 214, which in turn drives the mating member 213 to abut against the locking part 330. Specifically, in this embodiment, the elastic restoring force of the locking spring 340 can be set to be perpendicular to the line connecting the distal and proximal ends of the actuator assembly 300.

[0134] Please refer to Figure 4-6In one embodiment, the first unlocking part 211 is configured as a protrusion 2111 extending toward the staple cartridge assembly 400, and the second unlocking part 440 is configured as an unlocking groove 441. The protrusion 2111 has a first unlocking guide surface 2112, and the unlocking groove 441 has a second unlocking guide surface 442. When the protrusion 2111 is inserted into the unlocking groove 441, the first unlocking guide surface 2112 contacts the second unlocking guide surface 442, thereby driving the transmission mechanism 210 to disengage from the locking part 330.

[0135] When the user installs the staple cartridge assembly 400 into the mounting cavity, the protrusion 2111 is driven into the unlocking slot 441, and the first unlocking guide surface 2112 contacts the second unlocking guide surface 442, thereby causing the transmission mechanism 210 to disengage from the locking part 330. The protrusion 2111 and the unlocking slot 441 have a simple structure and are easy to integrate with the staple cartridge assembly 400 and the transmission mechanism 210 into a single structure, which helps to reduce the assembly complexity and system risk factor caused by adding extra parts. In other embodiments, the protrusion 2111 and the unlocking slot 441 can also be simply replaced and modified. For example, the positions of the protrusion 2111 and the unlocking slot 441 can be changed, with the protrusion 2111 placed on the staple cartridge assembly 400 and the unlocking slot 441 placed on the transmission mechanism 210.

[0136] In one embodiment, the positions of the latching member 450 and the latching portion 216 can also be simply interchanged, for example, please refer to Figure 19 and 20 When the fastener 450 is located in the transmission mechanism 210, this embodiment provides a stapler.

[0137] The stapler includes a handle assembly 100, a barrel assembly 200, and an actuator assembly 300.

[0138] The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The distal end of the barrel assembly 200 is connected to the actuator assembly 300, which includes a first jaw 310 and a second jaw 320. The first jaw 310 and the second jaw 320 are movably connected and can move relative to each other to achieve closing and opening. A mounting cavity for mounting the staple cartridge assembly 400 is formed between the first jaw 310 and the second jaw 320, and the transmission mechanism 210 extends into the mounting cavity. The transmission mechanism 210 moves between the proximal and distal ends of the mounting base 410, consisting of a staple pusher 420 and a cutting blade 430.

[0139] The fastener 450 has a connecting end and a free end, with the connecting end of the fastener 450 disposed on the transmission mechanism 210. The free end of the fastener 450 can move toward and away from the plane containing the tissue mating surface 412 on the mounting base 410 to achieve engagement and disengagement with the engagement portion 216 of the staple cartridge assembly 400.

[0140] Optionally, the connecting end of the buckle 450 can be connected to the far end of the transmission mechanism 210, or the buckle 450 and the transmission mechanism 210 can be an integral structure.

[0141] Please refer to Figure 19 and 20 When the latching member 450 is located in the transmission mechanism 210, this embodiment also provides a staple cartridge assembly 400.

[0142] The staple cartridge assembly 400 includes a mounting base 410, a staple pusher 420, a cutting blade 430, and a locking part 216.

[0143] The mounting base 410 has multiple mounting positions for mounting suture staples and a tissue-contacting surface 412 for contacting tissue. A pusher 420 is movably mounted on the mounting base 410, and a cutter 430 is connected to the mounting base 410. The pusher 420 and the cutter 430 are movable between the proximal and distal ends of the mounting base 410. A locking portion 216 is disposed on the pusher 420 or the cutter 430, and the locking portion 216 is used to engage and disengage with the stapler's locking member 450 along a movement path approaching and away from the plane containing the tissue-contacting surface 412 on the mounting base 410.

[0144] Optionally, the snap-fit ​​portion 216 can be connected to the cutting blade 430, or the snap-fit ​​portion 216 can be integrally formed with the cutting blade 430. The snap-fit ​​portion 216 can be connected to the pusher 420, or the snap-fit ​​portion 216 can be integrally formed with the pusher 420.

[0145] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A surgical instrument, characterized in that, include: Handle assembly; A barrel assembly, the proximal end of which is connected to a handle assembly, the barrel assembly including a transmission mechanism; A staple cartridge assembly includes a mounting base, a staple pusher, and a cutting blade. The mounting base has multiple mounting positions for mounting staples and a tissue-contacting surface for contacting tissue. The staple pusher is movably mounted on the mounting base, and the cutting blade is movably connected to the mounting base. The staple pusher and the cutting blade are movable between the proximal and distal ends of the mounting base. A fastener having a connecting end and a free end, the connecting end of the fastener being connected to one of a staple cartridge assembly and a transmission mechanism, the other of which has a snap-fit ​​portion; The actuator assembly includes a first jaw and a second jaw, the first jaw and the second jaw being movably connected and capable of relative movement to achieve closing and opening; a mounting cavity is formed between the first jaw and the second jaw, the staple cartridge assembly is disposed in the mounting cavity, and the distal end of the transmission mechanism extends into the mounting cavity. The transmission mechanism can drive the pusher and the cutting blade to move between the proximal and distal ends of the mounting base; the free end of the latch can move closer to and further away from the plane containing the tissue interface on the mounting base to achieve engagement and disengagement with the latching part. The actuator assembly has a locking part for locking with the transmission mechanism to prevent the transmission mechanism from moving axially along the actuator assembly; when the locking part is unlocked from the transmission mechanism, the transmission mechanism can drive the pusher and the cutting blade to move from the proximal end to the distal end of the mounting base. The transmission mechanism can move close to the plane where the tissue interface is located to unlock the locking part from the transmission mechanism. After the locking part is unlocked from the transmission mechanism, the free end of the buckle can engage with the snap-fit ​​part.

2. The surgical instrument as described in claim 1, characterized in that, The connecting end of the buckle is connected to the cutting blade.

3. The surgical instrument as described in claim 1, characterized in that, The cutting blade and the fastener are an integral structure.

4. The surgical instrument as described in claim 1, characterized in that, The connecting end of the buckle is connected to the push pin.

5. The surgical instrument as described in claim 1, characterized in that, The push pin and the fastener are an integral structure.

6. The surgical instrument as described in claim 1, characterized in that, At least a portion of the latching member is an elastic structure. The first jaw has a latching guide surface. When the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the distal end of the actuator assembly, the latching guide surface abuts against the latching member, causing the latching member to deform and move its free end closer to the plane containing the tissue bonding surface on the mounting base, thereby achieving latching with the latching part. When the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the proximal end of the actuator assembly, the latching member, under the elastic restoring force of the elastic structure, moves its free end away from the plane containing the tissue bonding surface on the mounting base, thereby achieving disengagement from the latching part.

7. The surgical instrument as described in claim 6, characterized in that, The entire fastener is made of elastic material.

8. The surgical instrument as described in claim 1, characterized in that, The snap-fit ​​part is configured as a snap-fit ​​groove, and the free end of the snap fastener has a fastening part. The snap-fit ​​groove includes a positioning part and a guide part. The fastening part can move along the guide part to be inserted into or disengaged from the positioning part.

9. The surgical instrument as described in claim 1, characterized in that, The proximal end of the mounting base has a disengagement guide surface. When the transmission mechanism drives the pusher and the cutting blade to move toward the proximal end of the actuator assembly, the disengagement guide surface can abut against the latching member, thereby causing the free end of the latching member to disengage from the latching portion.

10. The surgical instrument as claimed in claim 1, characterized in that, The free end of the fastener moves toward and away from the plane containing the tissue bonding surface in a direction perpendicular to the tissue bonding surface.

11. The surgical instrument as claimed in claim 1, characterized in that, The mounting base has a movable cavity arranged along its axial direction, and the pusher and the cutter are movably disposed within the movable cavity.

12. The surgical instrument as claimed in claim 11, characterized in that, The mounting base has a support portion located on the side of the movable cavity opposite to the mounting position, for supporting the pusher and the cutting blade.

13. The surgical instrument as claimed in claim 11, characterized in that, The proximal end of the mounting base has a limiting portion for preventing the pusher and the cutter from disengaging from the proximal end of the mounting base into the movable cavity.

14. The surgical instrument according to any one of claims 1-13, characterized in that, The transmission mechanism has a first unlocking part, and the staple cartridge assembly has a second unlocking part. When the staple cartridge assembly is installed in the mounting cavity, the first unlocking part cooperates with the second unlocking part to unlock the locking part from the transmission mechanism.

15. The surgical instrument as described in claim 14, characterized in that, The locking part abuts against the distal end of the transmission mechanism to lock with the transmission mechanism; when the staple cartridge assembly is correctly installed in the mounting cavity, the first unlocking part contacts the second unlocking part to drive the distal end of the transmission mechanism to disengage from the locking part, thereby unlocking with the transmission mechanism.

16. The surgical instrument as claimed in claim 14, characterized in that, The first unlocking part is configured as a protrusion extending toward the staple cartridge assembly, and the second unlocking part is configured as an unlocking groove. The protrusion has a first unlocking guide surface, and the unlocking groove has a second unlocking guide surface. When the protrusion is inserted into the unlocking groove, the first unlocking guide surface contacts the second unlocking guide surface to drive the transmission mechanism to disengage from the locking part.

17. A stapler, characterized in that, include: Handle assembly; A barrel assembly, the proximal end of which is connected to a handle assembly, the barrel assembly including a transmission mechanism; The actuator assembly includes a first jaw and a second jaw, the first jaw and the second jaw being movably connected, the first jaw and the second jaw being capable of relative movement to achieve closing and opening; a mounting cavity for mounting a staple cartridge assembly is formed between the first jaw and the second jaw, and the transmission mechanism extends into the mounting cavity. The transmission mechanism is used to drive the staple pusher and the cutting blade of the staple cartridge assembly to move between the proximal and distal ends of the mounting base; the transmission mechanism has a locking part for engaging and disengaging with the latching part of the staple cartridge assembly along the movement path of the plane containing the tissue interface on the mounting base. The actuator assembly has a locking part for locking with the transmission mechanism to prevent the transmission mechanism from moving axially along the actuator assembly; when the locking part is unlocked from the transmission mechanism, the transmission mechanism can drive the pusher and the cutting blade to move from the proximal end to the distal end of the mounting base. The transmission mechanism can move close to the plane where the tissue interface is located to unlock the locking part from the transmission mechanism. After the locking part is unlocked from the transmission mechanism, the free end of the buckle can engage with the snap-fit ​​part.

18. The stapler as claimed in claim 17, characterized in that, The snap-fit ​​part is configured as a snap-fit ​​groove, which includes a positioning part and a guide part. The guide part is used to guide the snap-fit ​​part of the free end of the snap fastener to be inserted into or disengaged from the positioning part.

19. A staple cartridge assembly, characterized in that, include: Mounting base, the mounting base having a plurality of mounting positions for mounting suture staples, the mounting base having a tissue-contacting surface for contacting tissue; A pusher pin, which is movably mounted on the mounting base; as well as A cutting blade connected to the mounting base, wherein the pusher and the cutting blade are movable between the proximal and distal ends of the mounting base; as well as The fastener has a connecting end and a free end. The free end of the fastener can move closer to and further away from the plane where the tissue mating surface is located on the mounting base, so as to achieve engagement and disengagement with the engagement part of the transmission mechanism. The free end of the fastener can move closer to the plane where the tissue mating surface is located in the transmission mechanism of the surgical instrument, so as to achieve engagement with the engagement part after the transmission mechanism is unlocked from the locking part.

20. The staple cartridge assembly as described in claim 19, characterized in that, The connecting end of the buckle is connected to the cutting blade.

21. The staple cartridge assembly as described in claim 19, characterized in that, The cutting blade and the fastener are an integral structure.

22. The staple cartridge assembly as described in claim 19, characterized in that, The connecting end of the buckle is connected to the push pin.

23. The staple cartridge assembly as described in claim 19, characterized in that, The push pin and the fastener are an integral structure.

24. The staple cartridge assembly as described in claim 19, characterized in that, At least a portion of the latching member is an elastic structure. The first jaw has a latching guide surface. When the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the distal end of the actuator assembly, the latching guide surface abuts against the latching member, causing the latching member to deform and move its free end closer to the plane containing the tissue bonding surface on the mounting base, thereby achieving latching with the latching part. When the transmission mechanism drives the pusher and the cutting blade to move along the latching guide surface towards the proximal end of the actuator assembly, the latching member recovers its deformation under the elastic restoring force of the elastic structure, and moves its free end away from the plane containing the tissue bonding surface on the mounting base, thereby achieving disengagement from the latching part.

25. The staple cartridge assembly as described in claim 24, characterized in that, The entire fastener is made of elastic material.

26. The staple cartridge assembly as described in claim 19, characterized in that, The mounting base has a disengagement guide surface at its proximal end, and the latching member has a fastening portion at one end facing the transmission mechanism. When the transmission mechanism drives the pusher and the cutting blade to move toward the proximal end of the actuator assembly, the disengagement guide surface abuts against the latching member, thereby causing the fastening portion to disengage from the latching portion of the transmission mechanism.

27. The staple cartridge assembly as described in claim 19, characterized in that, The free end of the fastener moves toward and away from the plane containing the tissue bonding surface in a direction perpendicular to the tissue bonding surface.

28. The staple cartridge assembly as described in claim 19, characterized in that, The mounting base has a movable cavity arranged along the axial direction, and the pusher and the cutter are movably disposed in the movable cavity.

29. The staple cartridge assembly as described in claim 28, characterized in that, The mounting base has a support portion located on the side of the movable cavity opposite to the mounting position, for supporting the pusher and the cutting blade.

30. The staple cartridge assembly as described in claim 28, characterized in that, The proximal end of the mounting base has a limiting portion for preventing the pusher and the cutter from disengaging from the proximal end of the mounting base into the movable cavity.

31. A stapler, characterized in that, include: Handle assembly; A barrel assembly, the proximal end of which is connected to a handle assembly, the barrel assembly including a transmission mechanism; The actuator assembly includes a first jaw and a second jaw, the first jaw and the second jaw being movably connected, the first jaw and the second jaw being capable of relative movement to achieve closing and opening; a mounting cavity for mounting a staple cartridge assembly is formed between the first jaw and the second jaw, and the transmission mechanism extends into the mounting cavity. The transmission mechanism pusher and cutter move between the proximal and distal ends of the mounting base; and The fastener has a connecting end and a free end. The connecting end of the fastener is disposed on the transmission mechanism. The free end of the fastener can move closer to and further away from the plane where the tissue mating surface is located on the mounting base, so as to realize the engagement and disengagement with the engagement part of the staple cartridge assembly. The actuator assembly has a locking part for locking with the transmission mechanism to prevent the transmission mechanism from moving axially along the actuator assembly; when the locking part is unlocked from the transmission mechanism, the transmission mechanism can drive the pusher and the cutting blade to move from the proximal end to the distal end of the mounting base. The transmission mechanism can move close to the plane where the tissue interface is located to unlock the locking part from the transmission mechanism. After the locking part is unlocked from the transmission mechanism, the free end of the buckle can engage with the snap-fit ​​part.

32. The stapler as claimed in claim 31, characterized in that, The connecting end of the buckle is connected to the far end of the transmission mechanism.

33. The stapler as claimed in claim 31, characterized in that, The buckle and the transmission mechanism are an integral structure.

34. A staple cartridge assembly, characterized in that, include: Mounting base, the mounting base having a plurality of mounting positions for mounting suture staples, the mounting base having a tissue-contacting surface for contacting tissue; A pusher pin, which is movably mounted on the mounting base; as well as A cutting blade connected to the mounting base, wherein the pusher and the cutting blade are movable between the proximal and distal ends of the mounting base; as well as The snap-fit ​​part is disposed on the pusher or the cutter, and is used to snap and release the snap-fit ​​part with the snap-fit ​​part of the stapler along the movement path of the plane where the tissue interface surface on the mounting base is located and away from it. The free end of the latching member can move near the plane where the tissue interface is located in the transmission mechanism of the surgical instrument, so as to achieve the locking of the transmission mechanism and the locking part after the locking part is unlocked.

35. The staple cartridge assembly as described in claim 34, characterized in that, The snap-fit ​​part is connected to the cutting blade.

36. The staple cartridge assembly as described in claim 34, characterized in that, The snap-fit ​​part and the cutting blade are an integral structure.

37. The staple cartridge assembly as described in claim 34, characterized in that, The snap-fit ​​part is connected to the push pin.

38. The staple cartridge assembly as described in claim 34, characterized in that, The snap-fit ​​part and the push pin are an integral structure.

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