A staple cartridge assembly and a surgical stapler

Abstract

The present application provides a kind of staple cartridge assembly and medical anastomat.The staple cartridge assembly includes shell, anvil, staple cartridge frame, staple cartridge, push knife assembly, safety mechanism, the safety mechanism includes installation area, the elastic deformation area that can be elastically deformed, drive area and stop area, the safety mechanism has locking state and unlocking state.The present application is avoided by setting safety mechanism in the case of not installing staple cartridge or in the case of not replacing the staple cartridge that has been fired again firing.The safety mechanism simple structure, easy industrial production, greatly reduce production cost.At the same time, the staple cartridge assembly is highly applicable, and can be applicable to different models of anastomat.

Description

Technical Field

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

[0002] Laparoscopic staplers are commonly used instruments in laparoscopic surgery. The stapler's tip has openable and closable jaws. After the jaws are closed and clamp the tissue, pulling the firing handle advances the cutting blade and firing block. The cutting blade cuts the tissue while the firing block pushes the staples upwards, stabilizing the corresponding tissue. After firing, the staple cartridge can be removed and replaced with a new one for continued use.

[0003] However, during the procedure, the operator may push out the scalpel without replacing the fired staple cartridge or without installing the staple cartridge. In this case, the tissue will be cut, but there are no staples in the staple cartridge to suture the tissue, which can lead to serious problems such as bleeding and leakage of contents.

[0004] Therefore, existing technologies incorporate a safety mechanism to prevent the cutting blade from advancing when the staple cartridge is not installed or when the cartridge has been fired and not replaced, thereby avoiding medical accidents.

[0005] For example, CN213489060U discloses a staple cartridge assembly and a medical stapler having the staple cartridge assembly. By setting a limiting part at the proximal end of the clamp and setting a safety part on the cutter body, when the firing block is located at the proximal end of the staple cartridge assembly, the pusher rod drives the cutter and the firing block to move together towards the distal end of the staple cartridge assembly. When the firing block is located at the distal end of the staple cartridge assembly, the pusher rod drives the cutter to move towards the distal end of the staple cartridge assembly until the limiting part and the safety part abut against each other, thereby restricting the cutter from continuing to move towards the distal end of the staple cartridge assembly, thus preventing doctors from misoperating. However, the safety mechanism of this patent is engaged with the firing block via an inclined plane. Furthermore, when the staple cartridge is installed onto the staple cartridge holder, the firing block is mounted on the travel path of the cutter. During the closing process of the staple cartridge assembly, the pusher rod drives the cutter to move towards the distal end of the staple cartridge assembly, and the safety mechanism of the cutter gradually approaches the safety contact of the firing block. Therefore, under the interaction of the two inclined planes, the cutter will generate a distal force on the firing block, which may cause the firing block to be pushed distally, thereby creating the risk of premature ejection of the staples and the failure of the safety mechanism to unlock properly, resulting in the stapler failing to fire. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a staple cartridge assembly and a medical stapler with different insurance mechanism structures.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] The first object of the present invention is to provide a staple cartridge assembly comprising:

[0009] case;

[0010] An anvil, which is fixedly installed at the distal end of the housing;

[0011] A staple cartridge holder, which is rotatably mounted at the distal end of the housing and can cooperate with the anvil to clamp tissue;

[0012] A staple cartridge, which is detachably installed in the staple cartridge frame, the staple cartridge including a staple cartridge body and a firing block movable within the staple cartridge body;

[0013] A pusher assembly, which is installed inside the housing and is movable along the axial direction of the housing, has a blocking portion;

[0014] The safety mechanism includes a mounting area at a distal end, an elastically deformable area at a proximal end of the mounting area capable of elastic deformation, a drive area at a proximal end of the mounting area, and a stop area at a proximal end capable of cooperating with the blocking part; the mounting area is fixedly connected to the anvil; the safety mechanism has a locked state and an unlocked state; when the safety mechanism is in the locked state, the stop area cooperates with the blocking part to prevent the pusher assembly from moving distally, and the extension direction of the drive area is consistent with the movement direction of the pusher assembly; when the safety mechanism is in the unlocked state, the stop area separates from the blocking part, and the pusher assembly can drive the firing block to move distally together;

[0015] When the firing block is located at the proximal end of the staple cartridge body, and the pusher assembly moves to the distal end to drive the staple cartridge frame to rotate in order to cooperate with the anvil, the firing block cooperates with the drive area, the elastic deformation area deforms, and the safety mechanism switches from the locked state to the unlocked state.

[0016] Preferably, the mounting area and the anvil are fixedly connected by welding or adhesive bonding.

[0017] Preferably, the surface of the firing block that mates with the driving area is planar and extends in the same direction as the extension direction of the staple cartridge body.

[0018] Preferably, the pusher assembly has a groove for the stop area to move, and the blocking part is the sidewall of the proximal end of the groove.

[0019] Preferably, the distal end of the elastic deformation zone is fixedly connected to or integrally formed with the proximal end of the mounting zone, and the proximal end is fixedly connected to or integrally formed with the distal end of the driving zone.

[0020] Preferably, the elastic deformation zone extends obliquely towards the interior of the staple cartridge assembly from the distal end to the proximal end.

[0021] Preferably, one of the staple cartridge body and the firing block has a groove formed on it, and the other has a protrusion that can mate with the groove.

[0022] Preferably, the stop area is rod-shaped and extends along the left-right direction of the staple cartridge assembly, and an upwardly protruding mating part is formed on the housing. When the safety mechanism is in the locked state, the blocking part and the mating part are located at the proximal end and distal end of the stop area, respectively, and are in contact with the stop area.

[0023] More preferably, the mating portions are formed on the left and right sides of the housing, respectively.

[0024] More preferably, the portion of the insurance mechanism that connects to the stop area is located outside the mating portion.

[0025] Preferably, the insurance mechanism further includes a buffer zone disposed between the drive zone and the stop zone, the buffer zone being curved.

[0026] According to some specific and preferred embodiments, the safety mechanism is formed by bending an elastic steel wire.

[0027] According to some other specific and preferred embodiments, the drive area is formed of a plastic part, and other parts of the safety mechanism are formed by bending an elastic steel wire, with the plastic part being fixedly connected to the elastic steel wire.

[0028] Preferably, the safety mechanism has a left-right symmetrical structure and an internal channel through which the pusher assembly can pass.

[0029] A second object of the present invention is to provide a medical stapler comprising the above-described staple cartridge assembly.

[0030] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0031] This invention provides a staple cartridge assembly with a different safety mechanism. By incorporating a safety mechanism, it prevents re-firing even when the staple cartridge is not installed or has not been replaced. This safety mechanism has a simple structure, is easy to industrialize, and significantly reduces production costs. Furthermore, this staple cartridge assembly has high applicability and can be used with different models of staplers. Attached Figure Description

[0032] Figure 1 This is the main view of the pin tray component in the open state according to a specific implementation method;

[0033] Figure 2A perspective view of the staple cartridge assembly in the clamped state according to a specific embodiment;

[0034] Figure 3 A schematic diagram of the structure of an insurance institution according to one specific implementation method;

[0035] Figure 4 A side view of the structure of an insurance institution according to one specific embodiment;

[0036] Figure 5 A schematic diagram illustrating the structure of the insurance mechanism and the pusher assembly in one specific embodiment;

[0037] Figure 6 A schematic diagram of the structure of the firing block, safety mechanism and pusher assembly in one specific embodiment;

[0038] Figure 7 This is a perspective view of the staple cartridge assembly in the open state, partially cut out, according to a specific embodiment (the firing block is not located at the proximal end of the staple cartridge body).

[0039] Figure 8 This is a front view of the staple cartridge assembly in the open state, partially cut out (the firing block is not located at the proximal end of the staple cartridge body).

[0040] Figure 9 This is a perspective view of the staple cartridge assembly in a clamped state, partially cut out, according to a specific embodiment (the firing block is not located at the proximal end of the staple cartridge body).

[0041] Figure 10 This is a front view of the staple cartridge assembly in the clamped state, partially cut out (the firing block is not located at the proximal end of the staple cartridge body).

[0042] Figure 11 This is a top view of the staple cartridge assembly in the clamped state, partially cut out (the firing block is not located at the proximal end of the staple cartridge body).

[0043] Figure 12 This is a perspective view of the staple cartridge assembly in the open state, partially cut out (the firing block is located at the proximal end of the staple cartridge body).

[0044] Figure 13 This is a front view of the staple cartridge assembly in the open state, partially cut out (the firing block is located at the near end of the staple cartridge body);

[0045] Figure 14 This is a perspective view of the staple cartridge assembly in a clamped state, partially cut out (the firing block is located at the proximal end of the staple cartridge body).

[0046] Figure 15This is a front view of the staple cartridge assembly in the clamped state, partially cut out (the firing block is located at the proximal end of the staple cartridge body).

[0047] Figure 16 A 3D view of the firing block;

[0048] Figure 17 A 3D view of the staple cartridge itself;

[0049] Figure 18 A top view showing the firing block located at the near end of the staple cartridge body;

[0050] Figure 19 A schematic diagram of the structure of an insurance institution as another specific implementation;

[0051] Figure 20 A side view of the structure of an insurance institution according to another specific embodiment;

[0052] Among them, 1. shell; 11. mating parts;

[0053] 2. Anvil;

[0054] 3. Stapling rack;

[0055] 4. Spike cartridge; 41. Spike cartridge body; 411. Protrusion; 412. Clearance groove; 42. Firing block; 421. Groove;

[0056] 5. Pusher assembly; 51. Pusher rod; 521. First crossbeam; 522. Second crossbeam; 523. Cutter body; 53. Slide groove; 531. Blocking part;

[0057] 6. Insurance institution; 61. Installation area; 62. Elastic deformation area; 63. Drive area; 64. Stop area; 65. Buffer zone; 66. Channel. Detailed Implementation

[0058] The present invention will be further described below with reference to embodiments. However, the present invention is not limited to the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to different requirements of specific applications, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0059] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0060] In the description of this invention, it should be understood that "distal end" refers to the end of the instrument or component away from the operator, and "proximal end" refers to the end of the instrument or component closer to the operator; "axial direction" refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the instrument or component; "inner" and "outer" are positions defined by distance relative to the center of the instrument or component, where "inner" is the position closer to the center of the instrument or component, and "outer" is the position away from the center of the instrument or component; "upper" and "lower" refer to the orientation of the instrument in its actual use or working state. The above description of directional terms is only for the convenience of describing the embodiments of this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention according to the specific circumstances.

[0063] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0064] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0065] In this embodiment, the medical stapler of the present invention is specifically explained using a laparoscopic stapler as an example. However, it should be noted that the technical spirit involved in the following embodiments can be applied to other types of staplers.

[0066] The medical stapler includes an instrument platform (not shown in the figures of this invention), a handle (not shown in the figures of this invention) movably connected to the instrument platform, and a staple cartridge assembly detachably connected to the distal end of the instrument platform, wherein the staple cartridge assembly is as follows: Figures 1 to 2 As shown. The instrument platform and handle can adopt structures commonly used in the prior art, which will not be described in detail in this invention.

[0067] like Figures 1 to 15 As shown, the staple cartridge assembly includes a housing 1, an anvil 2 fixedly mounted at the distal end of the housing 1, a staple cartridge holder 3 rotatably mounted at the distal end of the housing 1, a staple cartridge 4 detachably mounted within the staple cartridge holder 3, a pusher assembly 5 mounted within the housing 1 and movable along the axial direction of the housing 1, and a safety mechanism 6 fixedly connected to the proximal end of the anvil 2, wherein the staple cartridge holder 3 can cooperate with the anvil 2 to clamp tissue. The staple cartridge assembly has the following characteristics: Figure 1 The open state shown and as Figure 2 The closed state is shown.

[0068] Specifically, such as Figure 5 and Figure 6 As shown, the pusher assembly 5 includes a pusher rod 51 and a cutter. The cutter is fixedly connected to or formed at the distal end of the pusher rod 51. Under the action of the pusher rod 51, the cutter can push the firing block 42 to move to the distal end and push the suture staples out of the staple cartridge 4 in sequence, and then fix them to the tissue with the cooperation of the anvil 2.

[0069] like Figure 5 and Figure 6 As shown, the cutter includes a first crossbeam 521, a second crossbeam 522 disposed opposite to each other, and a cutter body 523 located between the first crossbeam 521 and the second crossbeam 522. A cutting blade for cutting tissue is fixedly disposed or formed on the cutter body 523. Figure 7 As shown, the first crossbeam 521 mates with the opposite side of the anvil surface of the anvil 2, and the second crossbeam 522 mates with the side of the staple cartridge frame 3 that is away from the anvil 2. During the closing process of the staple cartridge assembly, as the cutter moves to the distal end under the action of the push rod 51, the second crossbeam 522 will drive the staple cartridge frame 3 to rotate, so that the staple cartridge assembly closes to clamp the target tissue.

[0070] The staple cartridge 3, staple cartridge 4, and staple anvil 2 are respectively provided with a first cutting groove, a second cutting groove, and a third cutting groove. When the staple cartridge assembly is in the closed state, the first cutting groove, the second cutting groove, and the third cutting groove extend along the axial direction of the housing 1 to allow the pusher assembly 5 to move.

[0071] like Figure 7 As shown, the staple cartridge 4 is used to accommodate suture staples, and includes a staple cartridge body 41. The anvil surface of the staple cartridge body 41 near the anvil 2 has multiple staple holes for the suture staples to pass through during tissue suturing. Figure 12As shown, the staple cartridge 4 also includes a firing block 42, which is located inside the staple cartridge body 41 and can move along the distal-proximal direction within the staple cartridge body 41 under the push of the pusher assembly 5 to fire the suture staples.

[0072] like Figures 3 to 15 The diagram shows a safety mechanism 6 according to one embodiment. The safety mechanism 6 has a left-right symmetrical structure and includes a mounting area 61 located at the distal end, an elastic deformation area 62 located at the proximal end of the mounting area 61 and capable of elastic deformation, a drive area 63 located at the proximal end of the mounting area 61, a stop area 64 located at the proximal end and capable of cooperating with the blocking part 531 on the pusher assembly 5, and a channel 66 through which the pusher assembly 5 can pass. The safety mechanism 6 has a locked state and an unlocked state. When the firing block 42 in the staple cartridge 4 has been fired (i.e., the staple cartridge 4 is an old staple cartridge) or the staple cartridge 4 is not installed in the staple cartridge frame 3, since no firing block 42 exerts force on the drive area 63 of the safety mechanism 6 during the transition of the staple cartridge assembly from the open state to the closed state, the elastic deformation area 62 deforms, thereby causing the stop area 64 to move upward. Therefore, the safety mechanism 6 is in the locked state. When the staple cartridge 4 is a new staple cartridge and is installed in the staple cartridge frame 3, during the transition of the staple cartridge assembly from the open state to the closed state, the firing block 42 is located below the drive area 63 and can push the drive area 63 upward, causing the elastic deformation area 62 to deform. This causes the stop area 64 to move upward until it separates from the blocking part 531. The safety mechanism 6 is in the unlocked state. At this time, the pusher assembly 5 can move to the distal end to push the firing block 42 to the distal end, thereby completing the suturing and cutting of the tissue.

[0073] Specifically, the mounting area 61 is fixedly connected to the lower surface of the anvil 2. Preferably, the proximal end of the mounting area 61 is fixedly connected to the distal end of the elastic deformation area 62 or integrally formed by welding.

[0074] The elastic deformation zone 62 extends obliquely towards the interior of the staple cartridge assembly from the distal end to the proximal end. The distal end of the drive zone 63 is fixedly connected to or integrally formed with the proximal end of the elastic deformation zone 62. The safety mechanism 6 also includes a buffer zone 65, the distal end of which is fixedly connected to or integrally formed with the drive zone 63. In this embodiment, a portion of the buffer zone 65 is curved. Since there is a gap between the stop zone 64 and the mating part 11 (described in detail below) in the initial state, and without the firing block 42 at the proximal end of the staple cartridge body 41, when the pusher assembly 5 moves towards the distal end until the blocking part 531 abuts against the stop zone 64, the safety mechanism 6 is subjected to an axial thrust. The buffer zone 65 can absorb this thrust so that the stop zone 64 can smoothly contact the mating part 11 without damaging the safety mechanism 6. The proximal end of the buffer zone 65 is fixedly connected to or integrally formed with the stop zone 64. The stop zone 64 is rod-shaped and extends along the left and right direction of the pin cartridge assembly. The part of the safety mechanism 6 connected to the stop zone 64 (i.e. the part of the buffer zone 65) is located outside the mating part 11 on the housing 1.

[0075] like Figure 5 and Figure 6 As shown, a groove 53 is formed on the distal end of the pusher rod 51 of the pusher assembly 5 to facilitate the movement of the stop area 64 during the process of the pusher assembly 5 moving distally to change the staple cartridge assembly from an open state to a closed state. The length of the groove 53 is greater than or equal to the distance the pusher rod 51 moves distally when the staple cartridge holder 3 and the anvil 2 change from an open state to a closed state. Preferably, the distal sidewall of the groove 53 is an arc surface so that the cutter accommodates the stop area 64 of the safety mechanism 6 in the initial state. The pusher assembly 5 is also provided with the aforementioned blocking part 531, which is the proximal sidewall of the groove 53.

[0076] Preferably, such as Figure 9 As shown, a protruding mating portion 11 is formed on the housing 1. When the safety mechanism 6 is in the locked state, the blocking portion 531 and the mating portion 11 formed on the housing 1 are located at the proximal end and distal end of the stop area 64, respectively, and are in contact with the stop area 64. The blocking portion 531 and the mating portion 11 cooperate to better hold the stop area 64 between the blocking portion 531 and the mating portion 11 to prevent the pusher assembly 5 from moving further to the distal end, and to better prevent the stop area 64 from being pushed and deformed by the pusher rod 51 in the locked state. More preferably, as Figure 9 , Figure 11 and Figure 14As shown, a mating part 11 is formed on each of the left and right sides of the housing 1. The blocking part 531 is located on the axis of symmetry of the two mating parts 11. Thus, when the locking mechanism 6 is in the locked state, the two mating parts 11 and the blocking part 531 contact the stop area 64 through three points, thereby further improving the stability of the locking and further preventing deformation of the stop area 64. Furthermore, the housing 1 includes a body with an internal cavity and lower fixing blocks fixedly disposed on the front and rear sides of the body. The mating parts 11 are formed on the upper surface of the lower fixing blocks and extend upward.

[0077] like Figure 14 and Figure 15 As shown, the safety mechanism 6 is in the unlocked state. At this time, the firing block 42 and the drive area 63 cooperate through the avoidance groove 412 on the nail cartridge body 41. Under the action of the firing block 42, the elastic deformation area 62 deforms, causing the stop area 64 to move upward until the stop area 64 disengages from the blocking part 531, and the pusher assembly 5 can move further to the far end.

[0078] Specifically, such as Figure 17 and Figure 18 As shown, a symmetrical clearance groove 412 is formed on the proximal side of the staple cartridge body 41, near the anvil surface of the anvil 2. During the closing process of the staple cartridge assembly or when it is in the closed state, the drive area 63 enters the clearance groove 412 and is thus pushed upward by the firing block 42, causing the elastic deformation area 62 to deform, and the safety mechanism 6 changes from the locked state to the unlocked state. Preferably, the proximal end of the clearance groove 412 is open.

[0079] In this design, the surface where the firing block 42 and the drive area 63 cooperate is a plane, and its extension direction is consistent with the extension direction of the staple cartridge body 41. When the safety mechanism 6 is in the locked state, the extension direction of the drive area 63 is consistent with the axis of the housing 1. Furthermore, when the staple cartridge assembly is in the open state, the firing block 42 is located below the drive area 63. When the pusher assembly 5 drives the staple cartridge holder 3 to rotate and close the staple cartridge assembly, the firing block 42 comes into contact with the drive area 63, and the firing block 42 exerts an upward and slightly proximal force on the drive area 63. Therefore, the drive area 63 exerts a downward and slightly distal reaction force on the firing block 42. Consequently, the distal component of this reaction force is weaker. Compared to the prior art where the interaction of two inclined surfaces results in a larger distal component force on the firing block, this application significantly reduces the risk of the firing block being pushed distally, thus prematurely ejecting the staples.

[0080] To further reduce the risk of premature ejection of the firing block 42, a groove 421 is formed on one of the cartridge body 41 and the firing block 42, and a protrusion 411 that mates with the groove 421 is formed on the other. In this embodiment, as shown... Figure 16 As shown, a groove 421 is formed on the firing block 42, as... Figure 17 As shown, a protrusion 411 is formed on the staple cartridge body 41.

[0081] When the staple cartridge 4 is installed on the staple cartridge holder 3, the cutter is in the initial position near the end of the staple cartridge holder 3, the firing block 42 is in the near end of the staple cartridge body 41, and the staple cartridge holder 3 and the anvil 2 are in the open state. Figures 12 to 13 As shown. When the cutter is driven by the pusher rod 51, the pusher assembly 5 moves from its initial position to the distal end. The second crossbeam 522 then drives the staple cartridge 3 to rotate, cooperating with the anvil 2 to change the staple cartridge 3 and the anvil 2 from an open state to a closed state, during which the target tissue can be clamped. During the closing process, the firing block 42 exerts an upward force on the safety mechanism 6, causing the stop area 64 to move upward until it disengages from the blocking part 531. At this time, the stop area 64 avoids the blocking part 531 and the pusher rod 51. Through the firing handle, the pusher rod 51 can continue to push the cutter and the firing block 42 to the distal end.

[0082] After the cutting and stitching is completed, the pusher assembly 5 and the safety mechanism 6 are reset. However, if the staple cartridge assembly is fired again without replacing the staple cartridge 4, the pusher rod 51 will drive the cutter to move to the far end of the staple cartridge assembly. At this time, the stop area 64 of the reset safety mechanism 6 cooperates with the blocking part 531 to prevent the pusher assembly 5 from continuing to move to the far end, thus preventing misoperation.

[0083] To further improve the service life of the safety mechanism 6 and enable it to switch between the locked and unlocked states more frequently, the stop zone 64 moves upward by approximately 2 mm when transitioning from the locked to the unlocked state, for example, 1 to 3 mm; the difference between the angle between the elastic deformation zone 62 and the anvil surface of the anvil 2 when the elastic deformation zone 62 is not deformed and the angle between the elastic deformation zone 62 and the anvil surface of the anvil 2 when the elastic deformation zone 62 undergoes maximum deformation is approximately 5°, for example, 3 to 7°; the steel wire is made of 304 stainless steel.

[0084] In this embodiment, the safety mechanism 6 is formed by bending an elastic steel wire. Furthermore, to increase the contact area between the firing block 42 and the drive area 63 and to prevent wear or even damage to the firing block 42, the safety mechanism 6 in this invention is not limited to the steel wire structure and shape of this embodiment. In another embodiment, such as... Figures 19 to 20 The drive area 63 of the safety mechanism 6 is formed of a plastic part, while the other parts of the safety mechanism 6 retain their original shape and are formed by bending elastic steel wire. The plastic part is fixedly connected to the elastic steel wire. Furthermore, in this invention, the safety mechanism 6 may not include a buffer zone 65.

[0085] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A staple cartridge assembly, characterized in that: It includes Shell (1); Anvil (2), which is fixedly installed at the far end of the housing (1); The staple cartridge (3) is rotatably mounted at the distal end of the housing (1) and is able to cooperate with the anvil (2) to clamp tissue; The staple cartridge (4) is detachably installed in the staple cartridge frame (3), the staple cartridge (4) including a staple cartridge body (41) and a firing block (42) movable within the staple cartridge body (41); A pusher assembly (5) is installed inside the housing (1) and is movable along the axial direction of the housing (1). The pusher assembly (5) has a blocking part (531). The safety mechanism (6) includes a mounting area (61) at the distal end, an elastic deformation area (62) at the proximal end of the mounting area (61) capable of elastic deformation, a drive area (63) at the proximal end of the mounting area (61), and a stop area (64) at the proximal end capable of cooperating with the blocking part (531); the mounting area (61) is fixedly connected to the anvil (2); the safety mechanism (6) has a locked state and an unlocked state. When the safety mechanism (6) is in the locked state, the stop area (64) cooperates with the blocking part (531) to prevent the pusher assembly (5) from moving to the distal end, and the extension direction of the drive area (63) is consistent with the movement direction of the pusher assembly (5); when the safety mechanism (6) is in the unlocked state, the stop area (64) separates from the blocking part (531), and the pusher assembly (5) can drive the firing block (42) to move to the distal end together; When the firing block (42) is located at the near end of the staple cartridge body (41), and the pusher assembly (5) moves to the far end to drive the staple cartridge frame (3) to rotate to cooperate with the anvil (2), the firing block (42) cooperates with the drive area (63), the elastic deformation area (62) deforms, and the safety mechanism (6) changes from the locked state to the unlocked state; The stop area (64) is rod-shaped and extends along the left and right direction of the staple cartridge assembly. The housing (1) has an upwardly protruding mating part (11). When the safety mechanism (6) is in the locked state, the blocking part (531) and the mating part (11) are located at the proximal end and distal end of the stop area (64) respectively and are in contact with the stop area (64).

2. The staple cartridge assembly according to claim 1, characterized in that: The firing block (42) has a planar surface that mates with the drive area (63) and extends in the same direction as the extension direction of the staple cartridge body (41); and / or, the pusher assembly (5) has a groove (53) formed on it for the stop area (64) to move, and the blocking part (531) is the side wall of the proximal end of the groove (53).

3. The staple cartridge assembly according to claim 1, characterized in that: The distal end of the elastic deformation zone (62) is fixedly connected to or integrally formed with the proximal end of the mounting zone (61), and the proximal end is fixedly connected to or integrally formed with the distal end of the driving zone (63); and / or, the elastic deformation zone (62) extends inclinedly from the distal end to the proximal end toward the interior of the staple cartridge assembly.

4. The staple cartridge assembly according to claim 1, characterized in that: One of the staple cartridge body (41) and the firing block (42) has a groove (421) formed on it, and the other has a protrusion (411) that can engage with the groove (421).

5. The staple cartridge assembly according to claim 1, characterized in that: The mating portions (11) are formed on the left and right sides of the housing (1); and / or, the portion of the safety mechanism (6) connected to the stop area (64) is located outside the mating portion (11).

6. The staple cartridge assembly according to claim 1, characterized in that: The insurance mechanism (6) also includes a buffer zone (65) disposed between the drive zone (63) and the stop zone (64), the buffer zone (65) being curved.

7. The staple cartridge assembly according to claim 1, characterized in that: The safety mechanism (6) is formed by bending an elastic steel wire, or the drive area (63) is formed by a plastic part, and other parts of the safety mechanism (6) are formed by bending an elastic steel wire, with the plastic part being fixedly connected to the elastic steel wire.

8. The staple cartridge assembly according to any one of claims 1 to 7, characterized in that: The insurance mechanism (6) has a left-right symmetrical structure and has a channel (66) inside that allows the pusher assembly (5) to pass through.

9. A medical stapler, characterized in that: It includes the staple cartridge assembly as described in any one of claims 1 to 8.

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