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 a housing, a pair of clamping members disposed at the distal end of the housing, a push knife assembly and a safety mechanism having a locked state and an unlocked state, the safety mechanism includes a main body portion having elastic deformation ability, a connecting portion connected to the proximal end of the main body portion and mounted at the distal end of the housing, a pressure receiving portion connected to the distal end of the main body portion, and a blocking portion connected to the main body portion, when the safety mechanism is in the locked state, the blocking portion is in the initial position and hinders the distal movement of the push knife assembly; when the safety mechanism is in the unlocked state, the blocking portion deviates from the initial position and allows the distal movement of the push knife assembly. The staple cartridge assembly limits the distal movement of the push knife assembly to the staple cartridge assembly by setting the safety mechanism, effectively prevents the situation of firing again without installing the staple cartridge or without replacing the fired staple cartridge, avoids the occurrence of medical accidents or damage to normal tissues, and has high safety.

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 tip of the laparoscopic stapler has an openable and closable jaw. After the jaw is closed and clamps the tissue, pulling the firing handle will push the cutting blade and firing block forward. The cutting blade cuts the tissue, while the firing block pushes the staples upward and staples the corresponding tissue.

[0003] After completing the above suturing and cutting actions, the operator needs to reset the laparoscopic stapler and then replace it with a new staple cartridge so that the laparoscopic stapler can be used for the next suturing and cutting operation. However, during the operation, there may be a situation where the operator fires the staple cartridge again without replacing the already fired one (i.e., the old staple cartridge). In this case, after the cutter is pushed out, the tissue will be cut, but there are no staples in the cartridge to suture the tissue, which can lead to serious problems such as bleeding and leakage of contents. This risk also exists when no staple cartridge is installed. Therefore, a locking mechanism that can distinguish and lock the laparoscopic stapler with an old staple cartridge installed and one without a staple cartridge must be used to prevent the laparoscopic stapler from being accidentally fired. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a staple cartridge assembly with a safety mechanism and a medical stapler, which can lock the staple cartridge assembly with an old staple cartridge installed and without a staple cartridge installed.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A staple cartridge assembly includes a housing;

[0007] A first clamping member is disposed at the distal end of the housing;

[0008] A second clamping member is rotatably disposed at the distal end of the housing and capable of cooperating with the first clamping member to clamp tissue. The second clamping member includes a staple cartridge seat, a staple cartridge detachably disposed within the staple cartridge seat, and a firing block disposed at the proximal end of the staple cartridge and capable of moving toward the distal end of the staple cartridge.

[0009] The pusher assembly includes a pusher rod disposed within the housing and movable along the axial direction of the housing, and a cutting blade disposed at the distal end of the pusher rod;

[0010] The staple cartridge assembly also includes a safety mechanism with locked and unlocked states. The safety mechanism includes a main body with elastic deformation capability, a connecting part connected to the proximal end of the main body and mounted on the distal end of the housing, a pressure-bearing part connected to the distal end of the main body, and a blocking part connected to the main body. When the safety mechanism is in the locked state, the blocking part is in the initial position and prevents the pusher assembly from moving to the distal end; when the safety mechanism is in the unlocked state, the blocking part deviates from the initial position and allows the pusher assembly to move to the distal end.

[0011] The proximal end of the firing block has an extension that extends outward along its axial direction. When the second clamping member moves from the open state to the clamping state, the extension presses against the pressure portion and drives the main body to undergo elastic deformation, thereby causing the blocking portion to deviate from the initial position to the unlocked position, and switching the safety mechanism from the locked state to the unlocked state.

[0012] Preferably, the pressure-receiving part is located between the main body and the cutting blade. The pressure-receiving part and the extension part cooperate through an inclined guide slope extending upward, so that during the process of the second clamping member moving from the open state to the clamping state, the pressure-receiving part has a tendency to move radially outward along the housing.

[0013] In some embodiments, the pressure-bearing portion and / or the extension portion are provided with the guide ramp.

[0014] In some embodiments, the pressure-bearing portion is integrally formed with the main body portion.

[0015] Preferably, the main body is located on one side of the cutting blade, and the main body includes a first region connected to the pressure-receiving part and the blocking part, a second region connected to the connecting part, and a bending region connected between the first region and the second region.

[0016] In some embodiments, the bending region has one or more inwardly bent and generally U-shaped bending bodies. When there are multiple bending bodies, the bending bodies are arranged sequentially in the vertical direction or sequentially along the axial direction of the housing.

[0017] In some embodiments, the bending region has a first bending portion and a second bending portion connected together, the first bending portion bending outward and connected to the second region, and the second bending portion bending inward and connected to the first region.

[0018] Preferably, the extension direction of the first region and / or the second region is approximately parallel to the axial direction of the housing.

[0019] In some implementations, the first region and the second region are parallel but not coplanar.

[0020] In some embodiments, the main body is made of stainless steel sheet.

[0021] Preferably, the blocking portion is located at the distal end of the pusher assembly, and the blocking portion and the projection of the cutting blade on a first plane have an overlapping area, the first plane being perpendicular to the axial direction of the housing.

[0022] Furthermore, the blocking part includes a first blocking member and a second blocking member. One end of the first blocking member is connected to the main body and located at the front end of the pressure-bearing part, and the other end is provided with the second blocking member. The middle part of the first blocking member between its two ends extends towards the axis of the housing. The second blocking member extends upward and is higher than the cutting blade. When the safety mechanism is in the locked state, the second blocking member blocks the far end of the crossbeam on the cutting blade.

[0023] In some embodiments, the upper crossbeam of the cutting blade has a groove that mates with the second blocking member, the opening of the groove facing the second blocking member.

[0024] In some embodiments, the main body and the first blocking member are integrally formed.

[0025] In some embodiments, the other end of the first blocking member is formed with a slot, and the second blocking member is engaged in the slot.

[0026] Furthermore, the second blocking element is a blocking pin.

[0027] Preferably, the safety mechanism further includes an elastic element disposed at the lower end of the connecting portion and having elastic deformation capability. When the second clamping member is in the clamping state, the elastic element presses against the second clamping member and causes the second clamping member to have a tendency to rotate toward the opening state.

[0028] A second object of the present invention is to provide a medical stapler comprising the staple cartridge assembly as described above.

[0029] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0030] This invention provides a staple cartridge assembly that, by setting a safety mechanism, restricts the movement of the pusher assembly to the distal end of the staple cartridge assembly, effectively preventing the device from firing again without a staple cartridge installed or without replacing a fired staple cartridge, thus avoiding medical accidents or damage to normal tissues, and ensuring high safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the stapling cartridge assembly in an open state according to one embodiment of the present invention;

[0032] Figure 2 for Figure 1 The diagram shown is an exploded view of the staple cartridge assembly.

[0033] Figure 3 for Figure 1 A bottom view of the staple cartridge assembly shown;

[0034] Figure 4 for Figure 3 A cross-sectional view of the AA plane;

[0035] Figure 5 for Figure 4 Enlarged schematic diagram of part B;

[0036] Figure 6 This is a schematic diagram of the staple cartridge assembly (without showing the anvil cover) in a clamping state according to one embodiment of the present invention;

[0037] Figure 7 for Figure 6 A bottom view of the staple cartridge assembly shown;

[0038] Figure 8 for Figure 7 A sectional view of the C-plane;

[0039] Figure 9 for Figure 8 An enlarged schematic diagram of section D in the middle;

[0040] Figure 10 This is a schematic diagram of the safety mechanism and the cutting blade in one embodiment of the present invention, wherein the blocking part in the safety mechanism is located in the initial position;

[0041] Figure 11 for Figure 10 The front view of the insurance mechanism and the cutting blade is shown.

[0042] Figure 12 for Figure 10 Top view of the safety mechanism and cutting blade shown;

[0043] Figure 13 This is a schematic diagram of the structure of the safety mechanism and the cutting blade in one embodiment of the present invention, wherein the blocking part in the safety mechanism is located in the initial position and blocks the cutting blade from moving to the distal end;

[0044] Figure 14 This is a schematic diagram of the safety mechanism, cutting blade, and firing block in one embodiment of the present invention, wherein the blocking part in the safety mechanism is located in the unlocked position;

[0045] Figure 15 This is a schematic diagram of the structure of a safety mechanism (second blocking member not shown) in one embodiment of the present invention;

[0046] Figure 16 This is a schematic diagram of the structure of the insurance mechanism (second blocking member not shown) in the second embodiment of the present invention;

[0047] Figure 17 This is a schematic diagram of the safety mechanism (second blocking member not shown) in the third embodiment of the present invention;

[0048] Figure 18 This is a schematic diagram of the structure of the insurance mechanism (second blocking member not shown) in the fourth embodiment of the present invention;

[0049] Figure 19 This is a schematic diagram of the structure of the insurance mechanism (second blocking member not shown) in the fifth embodiment of the present invention;

[0050] Figure 20 This is a schematic diagram of the firing block in one embodiment of the present invention;

[0051] Figure 21 This is a schematic diagram of the staple cartridge assembly in a clamping state according to one embodiment of the present invention, wherein the staple cartridge has been fired;

[0052] Figure 22 This is a schematic diagram of the staple cartridge assembly in a clamping state according to one embodiment of the present invention, wherein the staple cartridge is not installed;

[0053] Among them, 1. Shell;

[0054] 2. First clamping component; 21. Anvil cover; 22. Anvil; 221. First tool path groove;

[0055] 3. Second clamping member; 31. Pin cartridge seat; 311. Third tool path groove; 32. Pin cartridge; 321. Second tool path groove; 33. Firing block; 331. Extension; 3311. First guide ramp;

[0056] 4. Pusher assembly; 41. Pusher rod; 42. Cutting blade; 421. Upper crossbeam; 422. Cutting blade body; 423. Lower crossbeam; 424. Groove;

[0057] 5. Insurance mechanism; 51. Main body; 511. Bending area; 5111. Bending body; 5112. First bending part; 5113. Second bending part; 512. First area; 513. Second area; 52. Connecting part; 53. Pressure-bearing part; 531. Second guide slope; 54. Blocking part; 541. First blocking member; 5411. Slot; 542. Second blocking member; 55. Elastic member. 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 staple cartridge assembly involved in the following embodiments can be replaced and used in 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: Figure 1 and Figure 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] The staple cartridge assembly includes a housing 1 and a pair of clamping members disposed at the distal end of the housing 1, namely a first clamping member 2 and a second clamping member 3, which have a clamping state capable of closing relative to each other to clamp the tissue to be cut in between (e.g., Figure 6 (as shown) and the open state that can be opened relative to each other (such as Figure 1 (As shown).

[0068] Specifically, see Figures 1 to 8 The first clamping member 2 is fixedly installed at the distal end of the housing 1, and includes an anvil cover 21 and an anvil 22. The second clamping member 3 is rotatably disposed at the distal end of the housing 1, and includes a staple cartridge seat 31 disposed opposite to the anvil 22, a staple cartridge 32 detachably disposed within the staple cartridge seat 31, and a firing block 33 disposed within the staple cartridge 32. The staple cartridge 32 can store staples (not shown in the figures of this invention) for staple insertion, and the firing block 33 can move along the axial direction of the staple cartridge 32 from the proximal end of the staple cartridge 32 to the distal end of the staple cartridge 32. In the initial state, the firing block 33 is located at the proximal end of the staple cartridge 32 and its proximal end has an extension 331 extending outward along its axial direction.

[0069] Furthermore, the anvil 22, the staple cartridge 32, and the staple cartridge seat 31 are respectively formed with a first guide groove 221, a second guide groove 321, and a third guide groove 311, which extend along the axial direction of the anvil 22, the staple cartridge 32, and the staple cartridge seat 31.

[0070] The staple cartridge assembly also includes a pusher assembly 4, which includes a pusher rod 41 and a cutting blade 42. The pusher rod 41 is disposed inside the housing 1 and can move axially along the housing 1. The pusher rod 41 is operatively connected to an actuation source such as the handle of a medical stapler. The cutting blade 42 is fixedly connected to or formed at the distal end of the pusher rod 41. Under the action of the pusher rod 41, the cutting blade 42 can push the firing block 33 to move distally and push the staples out of the staple cartridge 32 in sequence, and then fix them to the tissue with the cooperation of the anvil 22.

[0071] Furthermore, the cutting blade 42 includes an upper crossbeam 421, a cutting blade body 422, and a lower crossbeam 423 arranged sequentially from top to bottom. The cutting blade for cutting tissue is fixedly mounted or formed on the cutting blade body 422. The upper crossbeam 421 mates with the opposite side of the anvil 22 of the anvil 22, and the lower crossbeam 423 mates with the side of the staple cartridge seat 31 away from the anvil 22. As the cutting blade 42 moves distally under the action of the pusher rod 41, the lower crossbeam 423 drives the staple cartridge seat 31 to rotate, thereby closing the staple cartridge assembly to clamp the target tissue. When the staple cartridge assembly is in the closed state, the pusher assembly 4 can move axially along the housing 1 in the aforementioned first cutting groove 221, second cutting groove 321, and third cutting groove 311.

[0072] The stapling cartridge assembly also includes a safety mechanism 5 with locked and unlocked states. See also Figures 9 to 19 The safety mechanism 5 includes a main body 51 and a connecting part 52, a pressure-receiving part 53, and a blocking part 54 respectively connected to the main body 51. The connecting part 52 is located near the proximal end of the main body 51 and mounted at the distal end of the housing 1, while the pressure-receiving part 53 is located at the distal end of the main body 51. The main body 51 has elastic deformation capability. When the safety mechanism 5 is in the locked state, the blocking part 54 is in its initial position and prevents the pusher assembly 4 from moving to the distal end; when the safety mechanism 5 is in the unlocked state, the blocking part 54 deviates from its initial position and allows the pusher assembly 4 to move to the distal end. When the second clamping member 3 moves from the open state to the clamping state, the extension 331 of the firing block 33 presses against the pressure-receiving part 53 and drives the main body 51 to undergo elastic deformation, causing the blocking part 54 to deviate from its initial position to the unlocked position, thus switching the safety mechanism 5 from the locked state to the unlocked state.

[0073] Since the firing block 33 in the already fired cartridge 32 (i.e., the old cartridge 32) has moved to the far end of the cartridge 32, when the second clamping member 3 with the old cartridge 32 is in the clamping state, the pressure part 53 will not be pressed down, and therefore the blocking part 54 remains in the initial position (e.g., Figure 10 and 13 As shown, this prevents the pusher assembly 4 from moving distally. Similarly, when the second clamping member 3 without the staple cartridge 32 is in the clamping state, the pressure portion 53 will not be pressed due to the absence of the firing block 33. In this way, staple cartridge assemblies with and without the staple cartridge 32 can be locked, avoiding medical accidents such as surgical failure due to misoperation and reducing clinical risks.

[0074] Specifically, the pressure-bearing part 53 is located between the main body part 51 and the cutting blade 42. The pressure-bearing part 53 and the extension part 331 cooperate through the inclined upward guide slope. During the process of the second clamping member 3 moving from the open state to the clamping state, the pressure-bearing part 53 has a tendency to move outward along the radial direction of the housing 1.

[0075] Furthermore, the pressure-bearing portion 53 and / or the extension portion 331 are provided with guide ramps. In this embodiment, see... Figure 20 The upper part of the extension 331 is provided with a first guide slope 3311, see [reference]. Figures 15 to 19 The pressure-bearing part 53 is provided with a second guide slope 531. Through the cooperation of the first guide slope 3311 and the second guide slope 531, during the process of the second clamping member 3 moving from the open state to the clamping state, the pressure-bearing part 53 is squeezed by the extension part 331 and has a tendency to move outward along the radial direction of the shell 1.

[0076] Preferably, the pressure-bearing portion 53 is integrally formed with the main body portion 51. Further, the pressure-bearing portion 53 can be formed by bending a first sheet metal structure integrally formed with the main body portion 51. Even further, the free end of the sheet structure is bent toward the main body portion 51 and preferably contacts the main body portion 51.

[0077] The main body 51 is located on one side of the cutting blade 42. The main body 51 includes a first region 512 connected to a pressure-bearing part 53 and a blocking part 54, a second region 513 connected to a connecting part 52, and a bending region 511 connecting the first region 512 and the second region 513. By providing the bending region 511, irreversible plastic deformation of the main body 51 can be avoided.

[0078] In some embodiments, the bending region 511 has an inwardly bent and generally U-shaped bending body 5111, the bending body 5111 having a (see Figure 15 ) or more (see Figures 16 to 18When there are multiple bent bodies 5111, the bent bodies 5111 are arranged sequentially in the vertical direction (see details). Figure 16 and Figure 17 (The bent bodies 5111 have gaps between them) or are arranged sequentially along the axial direction of the shell (see details). Figure 18 In other embodiments, see Figure 19 The bending region 511 has a first bending portion 5112 and a second bending portion 5113 connected to each other. The first bending portion 5112 bends outward and connects to the second region 513, and the second bending portion 5113 bends inward and connects to the first region 512, such that the first region 512 and the second region 513 are not coplanar.

[0079] Furthermore, the extending directions of the first region 512 and / or the second region 513 are approximately parallel to the axial direction of the housing 1. In this embodiment, the first region 512 and the second region 513 are parallel to each other and their extending directions are respectively parallel to the axial direction of the housing 1.

[0080] Furthermore, the main body 51 is manufactured from stainless steel sheet, specifically through sheet metal bending. The stainless steel main body 51 is strong, not easily deformed, and can automatically recover its shape. Of course, other suitable metals, plastics, and other materials are also applicable.

[0081] The blocking part 54 is located at the far end of the pusher assembly 4. The blocking part 54 and the cutting blade 42 have an overlapping area on the projection of the first plane, which makes the pusher assembly 4 move towards the far end blocked. The first plane is perpendicular to the axial direction of the housing 1.

[0082] Specifically, the blocking part 54 includes a first blocking member 541 and a second blocking member 542. One end of the first blocking member 541 is connected to the main body 51 and located at the front end of the pressure-bearing part 53, while the other end is provided with the second blocking member 542. The first blocking member 541 extends towards the axis of the housing 1 from the middle portion between its two ends, and the second blocking member 542 extends upward and is higher than the cutting blade 42, blocking the distal end of the upper crossbeam 421 of the cutting blade 42. More specifically, the upper crossbeam 421 of the cutting blade 42 has a groove 424 that mates with the second blocking member 542. The groove 424 is located at the distal end of the upper crossbeam 421 and its opening faces the second blocking member 542. When the safety mechanism 5 is in the locked state and the cutting blade 42 moves to the distal end, the upper crossbeam 421 of the cutting blade 42 is blocked by the second blocking member 542, and the second blocking member 542 enters the groove 424, preventing the cutting blade 42 from continuing to move to the distal end. When the safety mechanism 5 is in the unlocked state, the second blocking member 542 deviates from its initial position, thus avoiding the cutting blade 42, and the cutting blade 42 can move to the far end.

[0083] Furthermore, the first blocking member 541 is located on the upper part of the distal end of the main body 51, and the first blocking member 541 is integrally formed with the main body 51. For example, the first blocking member 541 can be formed by bending a second sheet-like structural member integrally formed with the main body 51. Furthermore, the free end of the first blocking member 541 is bent toward the main body 51 to form a groove 5411, and the second blocking member 542 is engaged in the groove 5411.

[0084] Preferably, the second blocking element 542 is a blocking pin.

[0085] The connecting portion 52 is connected to one side of the main body 51, preferably the side adjacent to the cutting blade 42. Preferably, the connecting portion 52 is integrally formed with the main body 51, for example, it can be formed by bending a third sheet metal structure integrally formed with the main body 51.

[0086] The safety mechanism 5 also includes an elastic element 55 disposed at the lower end of the connecting portion 52 and having elastic deformation capability. When the second clamping member 3 is in the clamping state, the elastic element 55 presses against the second clamping member 3, causing the second clamping member 3 to tend to rotate towards the opening state. This safety mechanism 5 also integrates an open spring structure, which is simple in structure and easy to manufacture.

[0087] Specifically, the elastic member 55 extends obliquely downward. When the second clamping member 3 is in the clamping state, the distal end of the elastic member 55 presses against the inner surface of the staple cartridge seat 31. The elastic member 55 is preferably integrally formed with the main body 51, for example, it can be formed by bending a fourth sheet metal structure integrally formed with the main body 51.

[0088] Working principle:

[0089] Install the nail cartridge 32, operate the handle to rotate the second clamping member 3 upward until it reaches the clamping state. During this process, since the firing block 33 is located near the nail cartridge 32, through the cooperation of the guide ramp, the extension 331 of the firing block 33 moves upward and can squeeze the pressure part 53, so that the pressure part 53 has a tendency to move outward along the radial direction of the housing 1, thereby causing the main body 51 to undergo elastic deformation and move outward. The blocking part 54 moves outward under the drive of the main body 51, and then deviates from the initial position to the unlocked position. The blocking part 54 avoids the cutting blade 42. Through the firing handle, the pusher rod 41 can continue to push the cutting blade 42 and the firing block 33 to the far end.

[0090] After the cutting and suturing are completed, the pusher assembly 4 and the safety mechanism 5 are reset, but without replacing the staple cartridge 32 (as shown in the image). Figure 21 (as shown) or without the staple cartridge 32 (as shown) Figure 22In the case shown, if the staple cartridge assembly fires again, the pusher rod 41 drives the cutting blade 42 to move to the far end of the staple cartridge 32. At this time, the blocking part 54 of the reset safety mechanism 5 blocks the far end of the upper crossbeam 421 of the cutting blade 42, preventing the pusher assembly 4 from continuing to move to the far end, thus preventing misoperation.

[0091] 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, comprising a housing; A first clamping member is disposed at the distal end of the housing; A second clamping member is rotatably disposed at the distal end of the housing and capable of cooperating with the first clamping member to clamp tissue. The second clamping member includes a staple cartridge seat, a staple cartridge detachably disposed within the staple cartridge seat, and a firing block disposed at the proximal end of the staple cartridge and capable of moving toward the distal end of the staple cartridge. The pusher assembly includes a pusher rod disposed within the housing and movable along the axial direction of the housing, and a cutting blade disposed at the distal end of the pusher rod; Its features are: The staple cartridge assembly further includes a safety mechanism with locked and unlocked states. The safety mechanism includes a main body with elastic deformation capability, a connecting portion connected to the proximal end of the main body and mounted on the distal end of the housing, a pressure-bearing portion connected to the distal end of the main body, and a blocking portion connected to the main body. The main body is located on one side of the cutting blade. The main body includes a first region connecting the pressure-bearing portion and the blocking portion, a second region connecting the connecting portion, and a bending region connecting the first and second regions. The pressure-bearing portion is located between the main body and the cutting blade. The blocking portion is located on the pusher blade. At the distal end of the component, the blocking portion and the projection of the cutting blade on a first plane overlap. The first plane is perpendicular to the axial direction of the housing. The blocking portion includes a first blocking member and a second blocking member. One end of the first blocking member is connected to the main body and located at the front end of the pressure-bearing portion, and the other end is provided with the second blocking member. The middle portion of the first blocking member between its two ends extends towards the axis of the housing. The second blocking member extends upward and is higher than the cutting blade. The distal end of the upper crossbeam of the cutting blade is provided with a groove that mates with the second blocking member. The opening of the groove faces the second blocking member. When the safety mechanism is locked, the blocking part is in the initial position; when the safety mechanism is locked and the cutting blade moves to the distal end, the upper crossbeam of the cutting blade is blocked by the second blocking member, which can enter the groove to prevent the pusher assembly from moving to the distal end; when the safety mechanism is unlocked, the blocking part deviates from the initial position and allows the pusher assembly to move to the distal end. The proximal end of the firing block has an extension that extends outward along its axial direction. When the second clamping member moves from the open state to the clamping state, the extension presses against the pressure portion and drives the main body to undergo elastic deformation, thereby causing the blocking portion to deviate from the initial position to the unlocked position, and switching the safety mechanism from the locked state to the unlocked state. The safety mechanism further includes an elastic element disposed at the lower end of the connecting portion and having elastic deformation capability. When the second clamping member is in the clamping state, the elastic element presses against the second clamping member and causes the second clamping member to have a tendency to rotate toward the opening state.

2. The staple cartridge assembly according to claim 1, characterized in that: The pressure-bearing part and the extension part cooperate through an inclined upward guide slope, so that during the process of the second clamping member moving from the open state to the clamping state, the pressure-bearing part has a tendency to move radially outward along the shell.

3. The staple cartridge assembly according to claim 2, characterized in that: The pressure-bearing portion and / or the extension portion are provided with the guide slope; and / or The pressure-bearing part is integrally formed with the main body.

4. The staple cartridge assembly according to claim 1, characterized in that... The bending region has one or more inwardly bent U-shaped bending bodies. When there are multiple bending bodies, the bending bodies are arranged sequentially in the vertical direction or sequentially along the axial direction of the shell; or, the bending region has a first bending portion and a second bending portion connected together, the first bending portion bending outward and connected to the second region, and the second bending portion bending inward and connected to the first region; and / or, The extension direction of the first region and / or the second region is parallel to the axial direction of the housing; and / or, The main body is made of stainless steel sheet.

5. The staple cartridge assembly according to claim 1, characterized in that: The main body and the first blocking member are integrally formed; and / or, The second blocking element is a blocking pin; and / or, The other end of the first blocking member has a groove, and the second blocking member is engaged in the groove.

6. A medical stapler, characterized in that: It includes the staple cartridge assembly as described in any one of claims 1 to 5.

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