Staple cartridge assembly and surgical instrument

Abstract

The nail bin assembly comprises a suturing part and an exposed part located on the far side of the suturing part, the suturing part is provided with a plurality of suturing nail grooves containing suturing nails, the exposed part is provided with a U-shaped enveloping surface, the length of the U-shaped enveloping surface in the longitudinal direction is larger than or equal to 2.4 mm and smaller than or equal to 6 mm, and the length of the U-shaped enveloping surface in the longitudinal direction is larger than or equal to 6 mm. The far end of the U-shaped enveloping surface is smoothly arranged, and in the thickness direction, the far end of the U-shaped enveloping surface is located in the middle of the exposed part or located on the upper side of the middle of the exposed part. The whole U-shaped enveloping surface is arranged in a cambered surface mode, the far end of the U-shaped enveloping surface is located in the middle or the upper middle portion of the exposed part, the upper side and the lower side of the exposed part can guide tissue, medical staff can use the nail bin assembly to dissociate the tissue, and due to the fact that the far end of the exposed part is smoothly arranged, the tissue is not prone to being damaged when the nail bin assembly makes contact with the tissue.

Description

Technical Field

[0001] This disclosure relates to the field of surgical instrument technology, and in particular to a staple cartridge assembly and a surgical instrument. Background Technology

[0002] Surgical staplers are commonly used medical instruments that replace manual suturing. Their main working principle is to use a scalpel to sever tissue and titanium staples to anastomose it, similar to a stapler. Depending on the body part they are used for, staplers can be categorized into various types. For surgical staplers, the working principle involves inserting a cannula of a precisely positioned trocar into the patient's body at the surgical site. This creates a longitudinal incision in the tissue, and staples are applied to the opposite sides of the incision, thereby severing and anastomosing the tissue. Summary of the Invention

[0003] This disclosure is achieved through the following technical solution: a staple cartridge assembly includes a suture portion and an exposed portion located distal to the suture portion, wherein the suture portion is provided with a plurality of staple grooves for accommodating staples. The exposed portion has a U-shaped envelope surface. The length of the U-shaped envelope surface in the longitudinal direction is greater than or equal to 2.4 mm and less than or equal to 6 mm. The distal end of the U-shaped envelope surface is smoothly rounded. In the thickness direction, the distal end of the U-shaped envelope surface is located in the middle of the exposed portion or on the upper side of the middle of the exposed portion.

[0004] In one embodiment, the U-shaped envelope includes a first inner surface located at its upper distal end and a first free surface located at its lower distal end, both the first inner surface and the first free surface being arc surfaces.

[0005] In one embodiment, the first inner surface includes a first inclined surface and a first smooth surface connected to the first inclined surface, the first smooth surface being located on the distal side of the first inclined surface; the first free surface includes a second inclined surface and a second smooth surface connected to the second inclined surface, the second smooth surface being located on the distal side of the second inclined surface; the first smooth surface and the second smooth surface are connected to the distal end of the U-shaped envelope surface. In one embodiment, the curvature of both the first smooth surface and the second smooth surface is greater than or equal to 45°.

[0006] In one embodiment, in the thickness direction, the width of the distal end of the U-shaped envelope is smaller than that of the proximal end.

[0007] In one embodiment, the exposed portion further includes two first lateral free surfaces, one of which is located on the left side of the exposed portion and the other on the right side of the exposed portion, both of which intersect with the U-shaped envelope surface.

[0008] In one embodiment, in the lateral direction, the distal end of the U-shaped envelope is located at the middle of the exposed portion.

[0009] This disclosure also provides a surgical instrument including a jaw assembly, the jaw assembly including a staple cartridge seat and an antispin seat pivotally connected to the staple cartridge seat, the surgical instrument further including the staple cartridge assembly as described above; when the staple cartridge assembly is installed in the staple cartridge seat, the suture portion is received in the staple cartridge seat, and the exposed portion is located outside the staple cartridge seat. In one embodiment, the anvil includes a second free surface located on its upper portion, wherein the distal end of the second free surface is lower than the proximal end of the second free surface in the thickness direction.

[0010] In one embodiment, the distal end of the anvil is flush with the distal end of the exposed portion.

[0011] In one embodiment, the distal end of the anvil is located proximal to the distal end of the exposed portion, or the distal end of the anvil is located distal to the distal end of the exposed portion. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a surgical instrument according to one embodiment of the present disclosure; Figure 2 This is a schematic diagram of the jaw assembly in the open state according to an embodiment of the present disclosure; Figure 3 This is an exploded view of the staple cartridge assembly and staple cartridge seat according to one embodiment of this disclosure; Figure 4 This is a schematic diagram of the structure of a staple cartridge assembly in the prior art; Figure 5 This is a schematic diagram of the jaw assembly in a closed state according to an embodiment of the present disclosure; Figure 6 This is a schematic diagram of the structure of a jaw assembly in a closed state before it enters adjacent tissue, according to an embodiment of this disclosure. Figure 7 and Figure 8 This is a schematic diagram of the process by which a clamp assembly in a closed state enters adjacent tissue according to an embodiment of this disclosure; Figure 9 This is a schematic diagram of the exposed portion of an embodiment of the present disclosure; Figure 10 This is a schematic diagram of the end head structure according to one embodiment of the present disclosure; Figure 11 This is a schematic diagram of the jaw assembly according to another embodiment of the present disclosure; Figure 12 This is a schematic diagram of the jaw assembly according to another embodiment of the present disclosure; Figure 13 This is a schematic diagram of the jaw assembly according to another embodiment of the present disclosure; Figure 14 This is a top view of an anvil and staple cartridge assembly according to one embodiment of the present disclosure; Figure 15 is a structural schematic diagram of a staple cartridge assembly according to an embodiment of the present disclosure; Figure 16 and Figure 17 This is a schematic diagram of the closed-loop drive mechanism disclosed in this paper; Figure 18 This is a schematic diagram of the jaw assembly in a closed state according to an embodiment of the present disclosure; Figure 19 This is a schematic diagram of a structure in which an opening is formed between the anvil and the exposed portion according to an embodiment of the present disclosure; Figure 20 This is a schematic diagram of the structure of the first inner surface according to an embodiment of the present disclosure; Figure 21 This is a cross-sectional view of a jaw assembly according to an embodiment of this disclosure; Figure 22 This is a schematic diagram of the structure of the first inner surface according to another embodiment of the present disclosure; Figure 23 and Figure 24 This is a schematic diagram of the structure of a U-shaped envelope surface according to an embodiment of the present disclosure; Figure 25 This is a schematic diagram of the structure of the staple cartridge assembly before it enters adjacent tissue according to one embodiment of the present disclosure; Figure 26 This is a schematic diagram of the process by which the staple cartridge assembly enters adjacent tissue according to one embodiment of this disclosure. in: 100. Jaw assembly; 110. Anvil; 111. Front end portion; 112. Formed portion; 120. Staple cartridge holder; 130. Head end; 140. Rear end portion; 150. Outer sleeve; 160. Opening; 200, staple cartridge assembly; 210, exposed portion; 220, sewn portion; 221, sewn surface; 222, staple groove; 230, staple pusher groove; 240, structural rib; 250, first contact portion; 300, First free surface; 310, Proximal end; 320, Distal end; 330, Guide surface; 340, First portion; 350, Second portion; 360, Second inclined surface; 370, Second smooth surface; 400, Second free surface; 500, First inner surface; 510, First proximal end; 520, First distal end; 530, First guide surface; 540, First inclined surface; 550, First smooth surface; 600, U-shaped envelope surface; 710. Upper part of the structure; 720. Lower part of the structure; 810. First transverse free surface; 820. Second transverse free surface; 900, Closed drive mechanism; 910, Motor drive wheel; 920, Gear; 930, Connecting rod; 940, Push block; X, Longitudinal direction; Z, Thickness direction; Y, Lateral direction. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description, in conjunction with the accompanying drawings and embodiments, is provided. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0014] It is important to understand that the terms "proximal" and "distal" used in this article are relative to the clinician manipulating the stapler's handle. "Proximal" refers to the part closer to the clinician, while "distal" refers to the part farther away. That is, the handle is proximal, and the jaw assembly is distal. For example, the proximal end of a component refers to the end relatively closer to the handle, and the distal end refers to the end relatively closer to the jaw assembly. The terms "upper" and "lower" are relative to the relative positions of the anvil and stapler seat on the jaw assembly; specifically, the anvil is "upper," and the stapler seat is "lower." However, staplers can be used in many orientations and positions, so these terms expressing relative positional relationships are not limited or absolute.

[0015] In this disclosure, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a movable 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, such as contact. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances. It should be noted that when "connected" or "linked" is preceded by a qualifier, it has the meaning defined by that qualifier, excluding only obviously excluding cases, but not other possible cases. For example, "detachable connection" refers to a detachable connection, excluding an integral part, but movable connections are not excluded.

[0016] This disclosure provides a surgical instrument, which can be a stapler, such as... Figures 1 to 3As shown, the surgical instrument includes a jaw assembly 100, which includes a staple cartridge seat 120 and an anvil seat 110 pivotally connected to the staple cartridge seat 120. The jaw assembly 100 has an open state and a closed state, and the anvil seat 110 pivots relative to the staple cartridge seat 120 to switch the jaw assembly between the open state and the closed state.

[0017] The surgical instrument also includes a staple cartridge assembly 200 detachably mounted to the staple cartridge holder 120. The staple cartridge assembly 200 includes a suture portion 220 and an exposed portion 210. When the staple cartridge assembly 200 is mounted to the staple cartridge holder 120, the suture portion 220 is located inside the staple cartridge holder 120, and the exposed portion 210 is located outside the staple cartridge holder 120.

[0018] During surgical procedures, the jaw assembly 100 enters the human body to clamp the tissue. After entering the puncture cannula, the jaw assembly 100 is generally in an open state. Medical personnel can free the tissue through the anvil 110 or the staple cartridge assembly 200, for example, by inserting the anvil 110 or the staple cartridge assembly 200 between adjacent tissues. By moving the jaw assembly 100, the adjacent tissues can be separated, thereby exposing the target tissue so that it can be clamped by the jaw assembly 100.

[0019] In this disclosure, the longitudinal direction X is defined as the direction from the proximal end to the distal end of the staple cartridge assembly 200, and the thickness direction Z is defined as the direction from the upper surface to the lower surface of the staple cartridge assembly.

[0020] The exposed portion 210 has a length of 2.4mm-6mm in the longitudinal direction X. Figure 4 The staple cartridge assembly 200 in the prior art has an exposed portion 210 with a length greater than or equal to 12 mm. Compared with the staple cartridge assembly 200 in the prior art, the exposed portion 210 of the staple cartridge assembly 200 in this disclosure is shorter in the longitudinal direction X, thereby reducing the length of the staple cartridge assembly 200. In the face of a confined surgical environment, the shorter staple cartridge assembly 200 in this embodiment can move flexibly in a confined space.

[0021] In embodiments of this disclosure, the jaw assembly 100 can free tissue in a closed state (and without clamping tissue), and after freeing the tissue, the jaw assembly 100 can be opened to clamp the target tissue.

[0022] like Figure 5 and Figure 6 As shown, the exposed portion 210 includes a first free surface 300 located at its lower part, and the anvil 110 includes a second free surface 400 located at its upper part. The distance between the first free surface 300 and the second free surface 400 gradually decreases from near to far. In this embodiment, using... Figure 5The direction from the staple cartridge assembly 200 to the anvil 110 is described as upward for illustrative purposes only and is not specifically limited. The exposed portion 210 is located at the distal end of the staple cartridge assembly 200, and the second free surface 400 is disposed at the distal end of the anvil 110.

[0023] The anvil 110 includes a shaped portion 112 and a front end portion 111. When the jaw assembly 100 is in the closed state, the front end portion 111 corresponds to the exposed portion 210 of the staple cartridge assembly 200, and the shaped portion 112 corresponds to the sutured portion 220 of the staple cartridge assembly 200. A second free surface 400 is disposed on the upper part of the front end portion 111 of the anvil 110. The front end portion 111 and the exposed portion 210 form a head portion 130, and the shaped portion 112 and the sutured portion 220 form a rear end portion 140. When the jaw assembly 100 is in the closed state, the head portion 130 is located at the distal end of the jaw assembly 100, and the rear end portion 140 is located proximal to the head portion 130. When the jaw assembly 100 is in the closed state and is freeing tissue, the jaw assembly 100 first enters the space between adjacent tissues through the head portion 130 located at its distal end, and then selectively allows the rear end portion 140 to enter the space between adjacent tissues.

[0024] The first free surface 300 is disposed at the lower part of the exposed portion 210, such that the first free surface 300 constitutes the lower surface of the end head 130; the second free surface 400 is disposed at the upper part of the front end portion 111, such that the second free surface 400 constitutes the upper surface of the end head 130. The first free surface 300 and the second free surface 400 gradually narrow from near to far in the vertical direction, such that the end head 130 has a shape that is wider at the proximal end and narrower at the distal end.

[0025] For example, such as Figures 6 to 8 As shown, when the jaw assembly 100 is in a closed state and is used to dissect tissue, the jaw assembly 100 first enters the space between adjacent tissues along its length direction. Specifically, the head portion 130 moves distally to enter the space between adjacent tissues, which include an upper tissue portion 710 and a lower tissue portion 720. These upper and lower tissue portions 710 can be human tissue or blood vessels. After the head portion 130 enters the space between the upper and lower tissue portions 710, the rear portion 140 also enters the space between them, positioning the upper tissue portion 710 above the jaw assembly 100 and the lower tissue portion 720 below it. After the jaw assembly 100 enters the space between adjacent tissues, medical personnel can move the jaw assembly 100 to separate the upper and lower tissue portions 710, thereby exposing the target tissue and achieving tissue dissection. The target organization can be the upper organization 710 and the lower organization 720, or it can be located far from the upper organization 710 and the lower organization 720.

[0026] The distance between the first free surface 300 and the second free surface 400 gradually decreases from near to far, making the distal end of the tip 130 narrow and the proximal end wide, which facilitates entry between the upper part of the tissue 710 and the lower part of the tissue 720. At the same time, the first free surface 300 and the second free surface 400 can guide the movement of the tissue, causing the upper part of the tissue 710 and the lower part of the tissue 720 to move away from each other, thereby moving the upper part of the tissue 710 to the upper side of the jaw assembly 100 and the lower part of the tissue 720 to the lower side of the jaw assembly, so as to better free the tissue.

[0027] like Figure 7 and Figure 9 As shown, the first free surface 300 includes a proximal end portion 310, a distal end portion 320, and a guide surface 330 connecting the proximal end portion 310 and the distal end portion 320. The guide surface 330 is, for example, an inclined surface that is not parallel to the longitudinal direction X of the jaw assembly 100. The distal end portion 320 is located above the proximal end portion 310, such that the distal end of the first free surface 300 is higher than the proximal end. When the jaw assembly 100 in the closed state enters between adjacent tissues, the distal end portion 320 first contacts the lower tissue portion 720, and then guides the lower tissue portion 720 through the guide surface 330, causing the lower tissue portion 720 to move downwards, thereby positioning the lower tissue portion 720 below the jaw assembly 100.

[0028] In one embodiment of this disclosure, such as Figure 7 and Figure 10 As shown, the distal end of the second free surface 400 is lower than the proximal end, and the proximal end of the first free surface 300 is lower than the distal end, so that the distance between the first free surface 300 and the second free surface 400 gradually decreases from near to far. The second free surface 400 is, for example, generally an inclined plane. When the jaw assembly 100 is in the closed state, in the thickness direction Z, the second free surface 400 and the first free surface 300 are generally "V" shaped, making it easy for the tip 130 to enter between adjacent tissues. When the jaw assembly 100 in the closed state enters between adjacent tissues, the distal end of the second free surface 400 first contacts the upper tissue 710, guiding the upper tissue 710 through the second free surface 400, causing the upper tissue 710 to move upward along the second free surface 400, thereby positioning the upper tissue 710 on the upper side of the jaw assembly 100.

[0029] For example, the length of the first free surface 300 in the thickness direction Z is greater than or equal to 4.5 mm and less than or equal to 8.5 mm. Figure 10 In the illustrated embodiment, when the jaw assembly 100 is in the closed state, the length of the second free surface 400 in the thickness direction Z is greater than or equal to 1 mm and less than or equal to 3 mm. The length of the second free surface 400 in the longitudinal direction X is greater than or equal to 5 mm and less than or equal to 9 mm.

[0030] In another embodiment, such as Figure 11 As shown, the proximal and distal ends of the second free surface 400 are at the same height. Since the proximal end of the first free surface 300 is lower and the distal end is higher, the distance between the first free surface 300 and the second free surface 400 gradually decreases from near to far. This results in the distal end of the tip 130 being narrower and the proximal end being wider, making it easier for the tip 130 to enter between adjacent tissues.

[0031] In one embodiment, such as Figures 10 to 12 As shown, the guide surface 330 is an arc-shaped bevel, making the proximal end 310 and the distal end 320 smoother, reducing the chance of cutting tissue and protecting human tissue. In another embodiment, the guide surface 330 is a straight bevel.

[0032] In one embodiment, such as Figures 10 to 13 As shown, the proximal end 310 of the first free surface 300 is located at the lower end of the exposed portion 210; the lower end (proximal end 310) of the exposed portion 210 is flush with the lower end of the staple cartridge seat 120, such that the proximal end 310 of the first free surface 300 is flush with the lower end of the staple cartridge seat 120. Being flush means that in the longitudinal direction X of the staple cartridge assembly 200, the proximal end 310 and the lower end of the staple cartridge seat 120 are generally on the same straight line. When the jaw assembly 100 in the closed state peels off tissue, the lower part of the tissue 720 moves towards the proximal end 310 under the guidance of the guide surface 330. Since the proximal end 310 is flush with the lower end of the staple cartridge seat 120, the tissue passing through the proximal end 310 is located on the lower side of the staple cartridge seat 120, that is, on the lower side of the staple cartridge assembly 200. This ensures that when the jaw assembly 100 in the closed state peels off tissue, the tissue moving along the first free surface 300 will not interfere with the staple cartridge seat 120, so that the jaw assembly 100 in the closed state can better enter between adjacent tissues, while avoiding damage to the tissue.

[0033] In one embodiment, such as Figures 10 to 13 As shown, the proximal end 310 of the first free surface 300 is located at the closest end of the exposed portion 210, and the distal end 320 of the first free surface 300 is located at the farthest end of the exposed portion 210. Given that the length of the exposed portion 210 in the longitudinal direction X is shortened, the length of the first free surface 300 in the longitudinal direction X is equal to the longitudinal length of the exposed portion 210, maximizing the length of the first free surface 300 in the longitudinal direction X. When the tip 130 enters between adjacent tissues, the lower tissue 720 moves relative to the tip 130 in the longitudinal direction X. The longer length of the first free surface 300 in the longitudinal direction X can effectively guide the tissue smoothly.

[0034] In one embodiment, such as Figure 13As shown, the distal end 320 is flush with the upper end of the exposed portion 210. "Flush" means that in the longitudinal direction X of the staple cartridge assembly 200, the distal end 320 and the upper surface of the staple cartridge assembly 200 are roughly on the same straight line. Furthermore, the proximal end 310 is located at the lower end of the exposed portion 210, such that the length of the first free surface 300 in the thickness direction Z is equal to the length of the exposed portion 210 in the thickness direction Z, maximizing the length of the first free surface 300 in the thickness direction Z. This allows the first free surface 300 to guide more tissue movement to the underside of the jaw assembly 100 when the tip 130 enters between adjacent tissues in the longitudinal direction X.

[0035] In one embodiment, such as Figures 10 to 12 As shown, the distal end portion 320 is located in the middle of the exposed portion 210 or above the middle of the exposed portion 210. The distal end portion 320 being located in the middle of the exposed portion 210 or above the middle means that, in the thickness direction Z, the distal end portion 320 is located in the middle of the exposed portion 210 or above the middle.

[0036] like Figure 14 and Figure 15a As shown, the suture portion 220 of the staple cartridge assembly 200 has a suture surface 221 with multiple staple grooves 222. Each staple groove 222 contains a staple (not shown). The surgical instruments include a cutting blade assembly and a staple pusher plate (not shown) connected to the cutting blade assembly. After the jaw assembly 100 clamps the target tissue, in response to the operation of the medical personnel, the cutting blade assembly moves distally, simultaneously driving the staple pusher plate distally. The distally moving staple pusher plate fires the staple in the staple groove 222, causing the staple to move upwards. The upward-moving staple passes through the clamped tissue via its legs, which are then held and bent by the staple holder 110. Multiple rows of staple grooves 222 are formed, each row arranged along the longitudinal direction X to suture the incision made by the cutting blade. The distance between the proximal end of the nearest staple groove and the distal end of the farthest staple groove is the suture length L3 of the staple cartridge assembly 200. In one example, the stitch length L3 of the staple cartridge assembly 200 is greater than or equal to 250 mm and less than or equal to 350 mm. In other embodiments, the stitch length of the staple cartridge assembly 200 may also be 450 mm or 600 mm.

[0037] Compared to embodiments where the stitch length of the staple cartridge assembly 200 is 450mm or 600mm, in embodiments where the stitch length L3 of the staple cartridge assembly 200 is greater than or equal to 250mm and less than or equal to 350mm, to accommodate the shorter staple cartridge assembly 200, the lengths of the staple cartridge seat 120 and the anvil seat 110 are also shorter. Therefore, when the jaw assembly 100 is in the open state, the distance between the distal end of the anvil seat 110 and the distal end of the exposed portion 210 is smaller. Figure 15bAs shown, when facing adjacent and large tissues, the distal end of the anvil 110 may easily come into contact with the tissue when using the staple cartridge assembly 200 alone, making it difficult for the staple cartridge assembly 200 to enter the adjacent tissues. Similarly, when using the anvil 110 alone, the staple cartridge assembly 2001 may come into contact with the tissue, making it difficult for the anvil 110 to enter the adjacent tissues. Using the jaw assembly 100 in a closed state to enter the adjacent tissues can avoid the above problems. When facing adjacent and small tissues, medical personnel can keep the jaw assembly 100 in an open state and use either the staple cartridge assembly 200 or the anvil 110 alone to dissect the tissue. In the embodiments of this disclosure, medical personnel can choose to use either the staple cartridge assembly 200 or the anvil 110 alone to enter the adjacent tissue to dissect the tissue, or they can use the jaw assembly 100 in a closed state to enter the adjacent tissue to dissect the tissue.

[0038] For example, the staple cartridge assembly 200 also includes a plurality of staple pusher slots 230, which are formed in the lower part of the staple cartridge assembly 200, extend along the longitudinal direction X of the staple cartridge assembly 200 and penetrate the exposed portion 210. The lower part of the exposed portion 210 includes a structural rib 240, which is used to separate adjacent staple pusher slots 230. The first free surface 300 includes a first part 340 and a second part 350. The first part 340 is located on the upper side of the structural rib 240 and connected to the structural rib 240. The second part 350 is formed by the outer surface of the structural rib 240.

[0039] In one embodiment, such as Figures 10 to 13 As shown, when the jaw assembly 100 is in the closed state, the distal end of the anvil 110 is flush with the distal end of the exposed portion 210. "Flush" means that, in the thickness direction Z, the distal end of the anvil 110 and the distal end of the staple cartridge assembly 200 are substantially on the same straight line. The flush alignment of the distal ends of the anvil 110 and the staple cartridge assembly 200 allows the first free surface 300 and the second free surface 400 to contact the tissue substantially simultaneously when the tip 130 enters adjacent tissue. For example, when the distal end of the first free surface 300 contacts the lower portion of tissue 720, the distal end of the second free surface 400 also contacts the upper portion of tissue 710. This allows the first free surface 300 and the second free surface 400 to guide the tissue almost simultaneously when the tip 130 enters adjacent tissue, making it easier for the tip 130 and the jaw assembly 100 to enter between adjacent tissues.

[0040] In another embodiment, when the jaw assembly 100 is in the closed state, the distal end of the anvil 110 is located distal to the distal end of the staple cartridge assembly 200, such that the distal end of the tip 130 is the distal end of the anvil 110, resulting in a thinner distal end of the tip 130, making it easier for the tip 130 to enter between adjacent tissues. In another embodiment, the distal end of the anvil 110 is located proximal to the distal end of the staple cartridge assembly 200, such that the distal end of the tip 130 is the distal end of the exposed portion 210, resulting in a thinner distal end of the tip 130, making it easier for the tip 130 to enter between adjacent tissues.

[0041] In one embodiment, such as Figure 14 As shown, the exposed portion 210 also includes two first lateral free surfaces 810, which are disposed on both sides of the exposed portion 210 in the lateral direction Y. The direction perpendicular to the longitudinal direction X on the upper surface of the staple cartridge assembly 200 is the lateral direction Y. The distal end of the anvil 110 also includes a second lateral free surface 820, which is disposed at the distal end of the anvil 110. When the jaw assembly 100 in the closed state is dislodging tissue, in the lateral direction Y, the two first lateral free surfaces 810 make the exposed portion 210 narrower at the distal end and wider at the proximal end, and the second lateral free surface 820 makes the distal side of the anvil 110 narrower and the proximal side wider. This makes it easier for the tip 130 to enter between adjacent tissues.

[0042] After the jaw assembly 100 frees the tissue and exposes the target tissue, in response to the operation of the medical staff, the jaw assembly 100 switches to the open state, forming a clamping space between the staple cartridge assembly 200 and the anvil 110. The medical staff controls the jaw assembly 100 to move, allowing the target tissue to enter the clamping space, and then controls the jaw assembly 100 to switch from the open state to the closed state, thereby clamping the target tissue.

[0043] After clamping the target tissue, in response to the actions of the medical staff, the cutting blade assembly moves distally to cut the clamped target tissue, while suture staples suture the incision. When the cutting blade assembly reaches its limit position, the target tissue is completely cut, and in response to the actions of the medical staff, the cutting blade assembly moves proximally back to its initial position. After the cutting blade assembly returns to its initial position, the medical staff opens the jaw assembly 100 and removes the surgical instruments from the body.

[0044] like Figure 1 , Figure 16 and Figure 17As shown, the surgical instrument includes a closure drive mechanism 900, which includes a motor (not shown), a motor drive wheel 910 connected to the motor, a gear 920 meshing with the motor drive wheel 910, a connecting rod 930 connected to the gear 920, a pusher 940 connected to the connecting rod 930, and an outer sleeve 150 connected to the pusher 940. The outer sleeve 150 is connected to the anvil 110 of the jaw assembly 100. In response to distal or proximal movement of the outer sleeve 150, the anvil 110 rotates relative to the staple cartridge seat 120.

[0045] When the jaw assembly 100 is in the open state, in response to the operation of medical personnel, the motor drives the motor drive wheel 910 to rotate in the first rotation direction. The motor drive wheel 910 drives the gear 920 to rotate, and the rotating gear 920 drives the connecting rod 930 to move distally. The connecting rod 930 drives the outer sleeve 150 to move distally through the push block 940. The distally moving outer sleeve 150 drives the pin holder 110 to rotate toward the staple cartridge assembly 200, thereby switching the jaw assembly 100 from the open state to the closed state. At this time, the motor stops moving, and the connecting rod 930 is parallel to the longitudinal direction X and is in the dead position. The connecting rod 930 can self-lock in the dead position, preventing the push block 940 and the outer sleeve 150 from moving proximally, thereby keeping the jaw assembly 100 in the closed state.

[0046] When the jaw assembly 100 is in the closed state, in response to the operation of medical personnel, the motor drives the motor drive wheel 910 to rotate in the second rotation direction, which is opposite to the first rotation direction. The motor drive wheel 910 drives the gear 920 to rotate, and the rotating gear 920 drives the connecting rod 930 to move proximally. The connecting rod 930 drives the outer sleeve 150 to move proximally through the push block 940. The proximally moving outer sleeve 150 drives the pin holder 110 to rotate toward the staple cartridge assembly 200, thereby switching the jaw assembly 100 from the closed state to the open state.

[0047] like Figure 6 , Figure 7 and Figure 18 As shown, when a medical professional uses the clamp assembly 100 in a closed state to dissect tissue, the tip 130 first contacts the tissue. In one embodiment, the distal end of the anvil 110 is separated from the distal end of the exposed portion 210 by a certain distance in a first direction, which is the thickness direction Z. This forms an opening 160 between the exposed portion 210 and the anvil 110.

[0048] When the jaw assembly 100 is in the closed state and is freeing tissue, the tip 130 moves distally to enter between adjacent tissues. When the tip 130 separates the adjacent upper tissue 710 and lower tissue 720, tissue from the upper tissue 710 or lower tissue 720 may enter the opening 160. In the prior art, the opening 160 formed between the front end portion 111 of the anvil 110 and the exposed portion 210 is relatively large and can accommodate a large amount of tissue. When the jaw assembly 100 is in the closed state and is freeing tissue, tissue located distal to the jaw assembly 100 (upper tissue 710 or lower tissue 720) is likely to enter the large opening 160. This can easily cause the tissue entering the opening 160 to be stuck by the front end portion 111 or the exposed portion 210 of the anvil 110, resulting in the upper tissue 710 being unable to move smoothly to the upper side of the jaw assembly 100, or the lower tissue 720 being unable to move smoothly to the lower side of the jaw assembly 100.

[0049] To reduce the likelihood of the above situation occurring, in one embodiment of this disclosure, the length of the exposed portion 210 in the longitudinal direction X is greater than or equal to 2.4 mm and less than or equal to 6 mm, and the distance between the distal end of the exposed portion 210 and the distal end of the anvil 110 in the thickness direction Z is D1, where D1 is greater than or equal to 2 mm and less than or equal to 6.5 mm. D1 is the width of the farthest end of the opening 160. Compared to existing technologies, the exposed portion 210 is shorter in the longitudinal direction X, which reduces the length of the opening 160 in the longitudinal direction; and the distance between the distal end of the exposed portion 210 and the distal end of the anvil 110 is smaller, which reduces the width of the distal end of the opening 160 (length in the thickness direction Z); the reduced length of the opening 160 in both the longitudinal direction X and the thickness direction Z results in a smaller volume of the opening 160, which means that when the jaw assembly 100 is in a closed state and frees tissue, less tissue enters the opening 160, reducing the probability that the tissue entering the opening 160 will be stuck by the anvil 110 or the exposed portion 210. This allows the upper tissue 710 to move smoothly to the upper side of the jaw assembly 100, and the lower tissue 720 to move smoothly to the lower side of the jaw assembly 100.

[0050] like Figure 19As shown, the staple cartridge assembly 200 includes a first inner surface 500 located on its upper portion, extending from the distal end of the exposed portion 210 towards the suture surface 221. For example, the first inner surface 500 is a slope, higher at the proximal end and lower at the distal end, and generally slopes downward in the proximal-to-distal direction. The front end portion 111 includes a first lower surface 1111 located on its lower portion. When the jaw assembly 100 is in the closed state, the first lower surface 1111 faces the first inner surface 500, and the opening 160 is located between the first inner surface 500 and the first lower surface 1111 of the front end portion 111. Figure 2 When the jaw assembly 100 is in the open state, a clamping space for receiving tissue is formed between the anvil 110 and the cartridge assembly 200. The clamping space is enclosed by the lower surface of the anvil 110 and the upper surface of the cartridge assembly 200. The first inner surface 500 is located at the distal end of the upper surface of the cartridge assembly 200. When the target tissue enters the clamping space from far to near, the target tissue moving towards the proximal side moves upward under the guidance of the first inner surface 500 and enters the clamping space when it contacts the first inner surface 500. The first inner surface 500 makes it easy for the target tissue to enter the clamping space.

[0051] When the jaw assembly 100 is in the closed state and is freeing tissue, the exposed portion 210 and the front end portion 111 of the anvil 110 form the aforementioned end head 130, with the front end portion 111 located above the exposed portion 210. In this embodiment, since the upper part of the staple cartridge assembly 200 is provided with a first inner surface 500, and the first inner surface 500 is inclined downward in the direction from proximal to distal (inclined away from the front end portion 111), there is a certain distance between the distal end of the exposed portion 210 and the distal end of the anvil 110 in the first direction, thereby forming the aforementioned opening 160 between the exposed portion 210 and the anvil 110. Since the distal end of the first inner surface 500 is lower and the proximal end is higher, the distance between the first inner surface 500 and the front end portion 111 gradually decreases in the direction from proximal to distal. Therefore, the distal end of the opening 160 has the largest width, and the width of the opening 160 gradually narrows in the direction from proximal to distal.

[0052] like Figure 20 As shown, the first inner surface 500 includes a first proximal end portion 510, a first distal end portion 520, and a first guide surface 530 connecting the first proximal end portion 510 and the first distal end portion 520. The first distal end portion 520 is lower than the first proximal end portion 510, so that the distal end of the first guide surface 530 is lower and the proximal end is higher.

[0053] In one embodiment, a first distal end portion 520 is disposed at the distal end of the exposed portion 210. The first distal end portion 520 is located in the middle or upper middle part of the exposed portion 210, that is, in the thickness direction Z of the exposed portion 210, the first distal end portion 520 is located in the middle or upper middle side. The location of the first distal end portion 520 in the middle or upper middle part of the exposed portion 210 maintains the guiding effect of the first inner surface 500 on the tissue while reducing the distance between the distal end of the exposed portion 210 and the distal end of the anvil 110, thereby reducing the width of the distal end of the opening 160 and thus reducing the volume of tissue entering the opening 160, thereby reducing the probability that the tissue entering the opening 160 will be stuck by the anvil 110 or the exposed portion 210.

[0054] In one embodiment, such as Figure 5 As shown, the first lower surface 1111 of the front end portion 111 is generally planar. When the first lower surface 1111 of the front end portion 111 is planar, the distal end of the first lower surface 1111 is closer to the distal end of the exposed portion 210, making the distance between the distal end of the front end portion 111 and the distal end of the exposed portion 210 smaller. This results in a smaller width (length in the thickness direction Z) of the distal end of the opening 160, thereby reducing the volume of tissue entering the opening 160 and decreasing the probability of tissue entering the opening 160 being stuck by the anvil 110 or the exposed portion 210.

[0055] In another embodiment, such as Figure 12 As shown, the lower surface of the formed portion 112 of the anvil 110 is generally flat. The distal end of the first lower surface 1111 of the front end portion 111 of the anvil 110 includes a slope 1112, which is higher than its proximal end. When the jaw assembly 100 is in the open state, medical personnel can dissect tissue independently through the anvil 110. Because the distal end of the first lower surface 1111 of the front end portion 111 is a slope 1112, the slope 1112 makes the distal end of the anvil 110 thinner than its proximal end, thus making it easier for the front end of the anvil 110 to be inserted between adjacent tissues for tissue dissection. At the same time, when the jaw assembly 100 is in the open state and intended to clamp tissue, the slope 1112 can guide the human tissue into the clamping space.

[0056] It is worth noting that the closed state includes a fully closed state and a partially closed state. When the jaw assembly 100 switches from the open state to the closed state and no tissue is being held, the jaw assembly 100 is in the fully closed state, in which the anvil 110 and the staple cartridge assembly 200 are partially abutted. When the jaw assembly 100 switches from the open state to the closed state and tissue is being held, the jaw assembly 100 is in the partially closed state, in which tissue exists between the anvil 100 and the staple cartridge assembly 200, causing the anvil 110 to separate from the staple cartridge assembly 200. The process of the closing drive mechanism 900 switching the jaw assembly 100 from the open state to the fully closed state and the partially closed state is described below.

[0057] When the jaw assembly 100 is not holding tissue, medical personnel can use the jaw assembly 100 in its fully closed state to free the tissue, such as... Figure 21 As shown, in the fully closed state, the anvil 110 is tilted overall, with its proximal end higher and its distal end lower, tilting downwards from near to far, i.e., tilting towards the direction of the staple cartridge assembly 200. The stitching portion 220 of the staple cartridge assembly 200 extends along the longitudinal direction X. The tilt of the anvil 110 causes the forming portion 112 and the stitching portion 220 to form an angle with each other. There is a certain distance between the distal end of the forming portion 112 and the distal end of the stitching portion 220. In the direction from near to far, because the anvil 110 is tilted towards the staple cartridge assembly 200, the distance between the forming portion 112 and the stitching portion 220 gradually decreases. On the distal side of the forming portion 112, the forming portion 112 and the stitching portion 220 are in contact or substantially in contact, forming a first contact portion 250.

[0058] The first inner surface 500 is located distal to the first contact portion 250, and the front end portion 111 of the anvil 110 is located distal to the first contact portion 250. Because the first inner surface 500 slopes downwards in a proximal direction (away from the front end portion 111), the first inner surface 500 separates from the lower surface of the front end portion 111, forming the aforementioned opening 160. The first contact portion 250 is located proximal to the opening 160, closing the proximal end of the opening 160, preventing tissue entering the opening 160 from continuing to move proximally, thereby reducing the volume of tissue entering the opening 160 and decreasing the probability of tissue entering the opening 160 being stuck by the anvil 110 or the exposed portion 210.

[0059] In one embodiment, such as Figure 20 and Figure 21As shown, the first proximal end portion 510 of the first inner surface 500 is disposed on the suture surface 221, that is, the first distal end portion 520 is disposed on the exposed portion 210, and the first proximal end portion 510 is disposed on the suture portion 220. For example, the first proximal end portion 510 coincides with the distal end of the first contact portion 250, and the opening 160 is partly located between the exposed portion 210 and the front end portion 111, and partly located between the suture portion 220 and the forming portion 112.

[0060] In another embodiment, such as Figure 22 As shown, the first distal end portion 520 is disposed at the distal end of the exposed portion 210, and the first proximal end portion 510 is disposed at the proximal end of the exposed portion 210, that is, the first inner surface 500 is disposed at the exposed portion 210. For example, the first proximal end portion 510 coincides with the distal end of the first contact portion 250 to form the proximal end of the opening 160, which is located between the exposed portion 210 and the front end portion 111.

[0061] The distance between the distal end of the first contact portion 250 and the distal end of the exposed portion 210 is the length of the opening 160. For example, the distance between the distal end of the first contact portion 250 and the exposed portion 210 is greater than or equal to 4.4 mm and less than or equal to 8 mm, which further reduces the volume of tissue entering the opening 160, thereby reducing the probability that the tissue entering the opening 160 will be stuck by the anvil 110 or the exposed portion 210.

[0062] In one embodiment, the anvil 110 is flush with the staple cartridge assembly 200, meaning that the distal end of the anvil 110 and the distal end of the staple cartridge assembly 200 are substantially on the same straight line in the thickness direction Z. This makes the longitudinal lengths of the two ends of the distal side of the opening 160 the same, and the opening 160 is generally V-shaped.

[0063] In another embodiment, the distal end of the anvil 110 is located distal to the distal end of the staple cartridge assembly 200, or the distal end of the anvil 110 is located proximal to the distal end of the staple cartridge assembly 200. This results in the two ends of the distal end of the opening 160 having different longitudinal lengths.

[0064] The following describes the process by which the closing drive mechanism 900 switches the jaw assembly 100 from an open state to a fully closed state and a partially closed state: The pusher block 940 of the closing drive mechanism 900 has a certain elasticity. When the jaw assembly 100 is in the open state and there is no tissue between the anvil 110 and the staple cartridge assembly 200, in response to the operation of medical personnel, the motor drives the gear 920 to rotate. The gear 920 drives the connecting rod 930 to move distally. The pusher block 940 drives the outer sleeve 150 to move distally, causing the anvil 110 to rotate toward the staple cartridge assembly 200. When the connecting rod 930 is at its dead point position, the connecting rod 930 moves a first distance. The connecting rod 930 drives the outer sleeve 150 through the pusher block 940, causing the outer sleeve 150 to move distally a first distance, so that the outer sleeve 150 is at its farthest position, closing the jaw assembly 100. The connecting rod 930 assembly at the dead point position self-locks, keeping the outer sleeve 150 at its farthest position, keeping the jaw assembly 100 closed. The anvil 110 rotates to its limit position, thus making the jaw assembly fully closed.

[0065] When the jaw assembly 100 is in the open state and there is tissue between the anvil 110 and the staple cartridge assembly 200, in response to the operation of medical personnel, the motor drives the gear 920 to rotate, the gear 920 drives the connecting rod 930 to move distally, and the pusher 940 drives the outer sleeve 150 to move distally, causing the anvil 110 to rotate toward the staple cartridge assembly 200. When the connecting rod 930 is in the dead position, both the connecting rod 930 and the pusher 940 move distally a first distance, intending to drive the outer sleeve 150 to move distally a first distance, so that the anvil 110 contacts the staple cartridge assembly 200.

[0066] However, due to the presence of tissue between the anvil 110 and the staple cartridge assembly 200, the anvil 110 and the staple cartridge assembly 200 are positioned on the upper and lower sides of the tissue, respectively, clamping the tissue. The anvil 110 cannot fit into the staple cartridge assembly 200. That is, due to the tissue between the anvil 110 and the staple cartridge assembly 200, the anvil 110 cannot rotate to its limit position, so the outer tube 150 cannot move a first distance to the distal side. For example, the outer tube 150 can only move a second distance to the distal side, and the second distance is less than the first distance.

[0067] After the connecting rod 930 moves a second distance to the distal side, the outer sleeve 150 also moves a second distance to the distal side, leaving the jaw assembly in a partially closed state. At this point, the connecting rod needs to continue moving to the distal side to the dead position, while the outer sleeve cannot continue moving to the distal side. During the process of the connecting rod 930 moving from the second distance to the first distance, the push block 940 undergoes elastic deformation, allowing the connecting rod 930 to move smoothly to the distal side to reach the dead position, while the outer sleeve 150 does not need to continue moving to the distal side. The connecting rod 930 assembly at the dead position self-locks, preventing the outer sleeve 150 from moving to the proximal side, thereby keeping the jaw assembly 100 in a partially closed state.

[0068] In existing technologies, such as Figure 4As shown, the exposed portion 210 of the staple cartridge assembly 200 forms a tip on the distal side. The upper side of the tip is an arc-shaped surface, and the lower side is a flat surface. When using the staple cartridge assembly 200 to dissipate tissue, it enters between adjacent tissues through the tip of the exposed portion 210. However, the distal end of the tip is relatively narrow, making the tip quite sharp. When facing thin or fragile tissues, the tip is likely to puncture the tissue upon contact, causing injury to the patient.

[0069] In response to the aforementioned technical problems, the embodiments of this disclosure, such as Figure 23 As shown, the exposed portion 210 has a U-shaped envelope surface 600, the distal end of which is rounded. In the thickness direction Z of the staple cartridge assembly 200, the distal end of the U-shaped envelope surface 600 is located in the middle or upper middle part of the exposed portion 210. The U-shaped envelope surface 600 extends along the thickness direction Z and surrounds the exposed portion 210 in the thickness direction Z. The U-shaped envelope surface 600 is generally arc-shaped. Because the distal end of the U-shaped envelope surface 600 is located in the middle or upper middle part of the exposed portion 210, tissue can be guided on both the upper and lower sides of the exposed portion 210, allowing medical personnel to use the staple cartridge assembly 200 to free tissue. Due to the rounded distal end of the exposed portion 210, it is less likely to cause tissue damage upon contact.

[0070] The U-shaped envelope 600 includes a first inner surface 500 located at its upper distal end and a first free surface 300 located at its lower distal end. The first inner surface 500 and the first free surface 300 are, for example, curved surfaces, so that the upper and lower sides of the distal end of the exposed portion 210 are curved surfaces, making the distal end of the U-shaped envelope smoother and less likely to puncture tissue.

[0071] The first distal end 520 of the first inner surface 500 coincides with the distal end 320 of the first free surface 300, both located at the distal end of the exposed portion 210. The proximal end of the first inner surface 500 is located above the proximal end 310 of the first free surface 300. This results in the U-shaped envelope 600 being narrow at the distal end and wide at the proximal end. Simultaneously, the distal end of the first free surface 300 is located at the distal end of the exposed portion 210, and the distal end of the first inner surface 500 is also located at the distal end of the exposed portion 210; that is, the distal end of the first free surface 300 coincides with the distal end of the first inner surface 500, and the first inner surface 500 and the first free surface 300 form a U-shaped envelope 600.

[0072] The U-shaped envelope 600 is narrow at its distal end and wide at its proximal end. When medical personnel use the staple cartridge assembly 200 to dissect tissue, they move the staple cartridge assembly 200 distally to enter between adjacent tissues. Then, they move the staple cartridge assembly 200 to separate non-target tissues, exposing the portion 210 at its distal end. When entering between adjacent tissues, the exposed portion 210 enters first, contacting the tissue through the U-shaped envelope 600. The U-shaped envelope 600, narrow at its distal end and wide at its proximal end, easily enters the gap between adjacent tissues, separating the adjacent tissues into an upper tissue portion 710 and a lower tissue portion 720. The upper tissue portion 710 is positioned above the staple cartridge assembly 200, and the lower tissue portion 720 is positioned below the staple cartridge base 120.

[0073] For example, such as Figure 24 As shown, the first inner surface 500 includes a first inclined surface 540 and a first smooth surface 550 connected to the first inclined surface 540. The first smooth surface 550 is located distal to the first inclined surface 540, and its distal end is located distal to the exposed portion 210. The first free surface 300 includes a second inclined surface 360 ​​and a second smooth surface 370 connected to the second inclined surface 360. The second smooth surface 370 is located distal to the second inclined surface 360, and its distal end is located distal to the exposed portion 210. The first smooth surface 550 and the second smooth surface 370 are connected to the distal side of the U-shaped envelope surface 600 and are located on the upper and lower sides of the distal end of the exposed portion 210. The first smooth surface 550 and the second smooth surface 370 constitute the distal arc surface of the U-shaped envelope surface 600, and the distal arc surface is configured to support tissue. For example, the curvature of the first smooth surface 550 and the second smooth surface 370 is greater than or equal to 45°, so that the curvature of the distal arc surface of the U-shaped envelope surface 600 is greater than or equal to 90°, making the distal end of the U-shaped envelope surface 600 smoother and less likely to puncture tissue.

[0074] When using the staple cartridge holder 120 and the staple cartridge assembly 200 installed within the staple cartridge holder 120 to dissect tissue, as the staple cartridge assembly 200 moves distally into the space between adjacent tissues, it first contacts the tissue through the distal end of the U-shaped envelope surface 600. The U-shaped envelope surface 600 is smoothly designed to minimize tissue damage. The U-shaped envelope surface 600 guides the upper portion of the tissue 710 to the upper side of the staple cartridge assembly 200 via the first inner surface 500, and guides the lower portion of the tissue 720 to the lower side of the staple cartridge holder 120 via the first dissipation surface 300, thus allowing the staple cartridge holder 120, in which the staple cartridge assembly 200 is installed, to enter the space between adjacent tissues. Medical personnel can then move the jaw assembly 100 to separate non-target tissues, achieving tissue dissipation.

[0075] In one embodiment, such as Figure 14As shown, the exposed portion 210 also includes two first lateral free surfaces 810, one of which is located on the left side of the exposed portion 210, and the other on the right side. These left and right sides are located in the lateral direction Y. When the staple cartridge assembly 200 is used to free tissue, in the lateral direction Y, the two first lateral free surfaces 810 make the exposed portion 210 narrower at the distal end and wider at the proximal end, thus making it easier for the exposed portion 210 to enter between adjacent tissues. Both first lateral free surfaces 810 intersect with the U-shaped envelope surface, and the first lateral free surfaces 810 are curved surfaces, making the surface of the U-shaped envelope surface smoother.

[0076] In the lateral direction, for example, the distal end of the U-shaped envelope is located in the middle of the exposed portion, so that the two first lateral free surfaces 810 are symmetrically arranged with respect to the distal end of the exposed portion 210, thereby improving the guiding effect of the two first lateral free surfaces 810.

[0077] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0078] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this disclosure and are not intended to limit the scope of protection of this disclosure. All equivalent implementations or modifications made without departing from the spirit of the art of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A staple cartridge assembly includes a suture portion and an exposed portion located distal to the suture portion, the suture portion being provided with a plurality of staple slots for receiving staples. The exposed portion has a U-shaped envelope surface. The length of the U-shaped envelope surface in the longitudinal direction is greater than or equal to 2.4 mm and less than or equal to 6 mm. The distal end of the U-shaped envelope surface is smoothly rounded. In the thickness direction, the distal end of the U-shaped envelope surface is located in the middle of the exposed portion or on the upper side of the middle of the exposed portion.

2. The staple cartridge assembly according to claim 1, characterized in that, The U-shaped envelope includes a first inner surface located at its upper distal end and a first free surface located at its lower distal end, both of which are curved surfaces.

3. The staple cartridge assembly according to claim 2, characterized in that, The first inner surface includes a first inclined surface and a first smooth surface connected to the first inclined surface, the first smooth surface being located on the far side of the first inclined surface; the first free surface includes a second inclined surface and a second smooth surface connected to the second inclined surface, the second smooth surface being located on the far side of the second inclined surface; the first smooth surface and the second smooth surface are connected to the far end of the U-shaped envelope surface.

4. The staple cartridge assembly according to claim 3, characterized in that, The curvature of both the first and second smooth surfaces is greater than or equal to 45°.

5. The staple cartridge assembly according to claim 1, characterized in that, In the thickness direction, the width of the distal end of the U-shaped envelope is smaller than that of the proximal end.

6. The staple cartridge assembly according to claim 1 or 5, characterized in that, The exposed portion further includes two first lateral free surfaces, one of which is located on the left side of the exposed portion and the other is located on the right side of the exposed portion. Both first lateral free surfaces intersect with the U-shaped envelope surface.

7. The staple cartridge assembly according to claim 1 or 5, characterized in that, In the lateral direction, the distal end of the U-shaped envelope is located at the middle of the exposed portion.

8. A surgical instrument, characterized in that, The instrument includes a jaw assembly comprising a staple cartridge seat and an antispin seat pivotally connected to the staple cartridge seat. The surgical instrument further includes a staple cartridge assembly as described in any one of claims 1-7. When the staple cartridge assembly is mounted on the staple cartridge seat, the suture portion is received within the staple cartridge seat, and the exposed portion is located outside the staple cartridge seat.

9. The surgical instrument according to claim 8, characterized in that, The anvil includes a second free surface located on its upper part, wherein the distal end of the second free surface is lower than the proximal end of the second free surface in the thickness direction.

10. The surgical instrument according to claim 8, characterized in that, The distal end of the anvil is flush with the distal end of the exposed portion.

11. The surgical instrument according to claim 8, characterized in that, The distal end of the anvil is located proximal to the distal end of the exposed portion, or the distal end of the anvil is located distal to the distal end of the exposed portion.

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