Nail cartridge assembly for surgical instrument and surgical instrument

Abstract

The present invention discloses a staple cartridge assembly for a surgical instrument, comprising a staple cartridge and a cutting blade. The staple cartridge comprises a staple, a staple pusher, and a staple cartridge body extending in a longitudinal direction. The staple cartridge body is provided with a staple cavity, in which the staple is received, and the staple pusher is used to push the staple out of the staple cavity. The staple cartridge also comprises a pusher for pushing the staple pusher. The cutting blade comprises a blade portion having a cutting edge. The cutting blade is rotatably connected to the pusher, and in an initial state or a state after cutting, the cutting edge is not exposed above the top surface of the staple cartridge body. In the initial state or the state after cutting, the cutting edge of the cutting blade of the present invention will neither damage tissue nor be damaged by foreign objects.

Description

Technical Field

[0001] The present invention relates to the field of surgical instruments. Background Art

[0002] Surgical instruments are surgical tools used in medical procedures, and suturing instruments are a type of surgical instrument. They are medical devices that replace manual suturing. Their main working principle is to use staples to sever or anastomose tissue, similar to a stapler. A suturing instrument includes a pair of cooperating, elongated jaw members (i.e., end effectors) that can be inserted into a patient's body to suturing and / or cutting tissue. The jaw members can support and accommodate a staple cartridge. Currently, existing staple cartridges generally include a cartridge body and staples disposed within the cartridge body. The cartridge body is provided with a plurality of staple cavities for accommodating staples. The cartridge body is provided with a knife slot extending along the longitudinal axis of the cartridge body, with the staple cavities arranged on both sides of the knife slot along the longitudinal axis. The knife slot allows a cutting knife to move along the knife slot. The cutting knife includes a base and a blade portion extending from the base. The base is located within the knife slot and moves along the knife slot, and the blade portion is located above the knife slot and is used to cut tissue. The staple cartridge body includes an insertion end and a distal end. When cutting tissue, the cutting blade moves from the distal end of the staple cartridge body to the insertion end. Because the front side of the staple cartridge is located at the front end of the jaw member's opening, after tissue cutting, the cutting blade is exposed at the front side of the staple cartridge. This blade can easily damage tissue when the open jaw member is moved within the patient's body or when the doctor removes the jaw member from the patient's body. The doctor can also be easily injured by the blade when replacing the staple cartridge. Summary of the Invention

[0003] The object of the present invention is to provide a nail magazine assembly for surgical instruments and a surgical instrument in which the cutting knife is not likely to damage tissue in an initial (unused) state or a cutting-completed state.

[0004] In order to achieve the above-mentioned object, the present invention is implemented through the following technical solutions: a nail magazine assembly for a surgical instrument, which includes a nail magazine and a cutting knife; the nail magazine includes a suture staple, a nail pusher and a nail magazine body extending along the longitudinal direction, the nail magazine body is provided with a nail cavity, the suture staple is accommodated in the nail cavity, and the nail pusher is used to push the suture staple out of the nail cavity; the nail magazine also includes a pusher for pushing the nail pusher; the cutting knife includes a blade portion, and the blade portion has a cutting edge; the cutting knife is rotatably connected to the pusher, and in the initial state or the cutting completion state, the cutting edge is not exposed above the top surface of the nail magazine body.

[0005] Furthermore, the nail magazine body is provided with a knife slot extending along the longitudinal direction; the pusher includes a limit block and a push portion located on both sides of the limit block, the limit block is located in the knife slot, and the cutting knife is rotatably connected to the limit block.

[0006] Furthermore, the limiting block is provided with a groove depressed downward from its top surface, and in an initial state or a cutting completion state, the cutting edge is located in the groove.

[0007] Furthermore, the nail magazine assembly also includes a rod member arranged on the pusher, the cutting knife is provided with a through slot, and the rod member is passed through the through slot.

[0008] Furthermore, the pusher includes a limit block and a pushing portion located on both sides of the limit block. The limit block is provided with a groove formed by being recessed downward from its top surface. The groove includes two groove walls arranged opposite to each other. The rod is passed through the through groove and its ends are respectively installed on the two groove walls.

[0009] Furthermore, the through slot includes a first part and a second part connected to each other, the first part is an arc-shaped through hole, the second part is an elongated through slot, and the diameter of the first part is greater than the width of the second part.

[0010] Furthermore, the cutting knife also includes a base extending from the blade portion, and the base has an arc-shaped corner; in an initial state, the arc-shaped corner is located outside the nail magazine body.

[0011] Furthermore, the nail magazine body includes an insertion end and a tail end; in an initial state, the cutting knife and the pusher are located at the tail end of the nail magazine body.

[0012] The present invention also provides a surgical instrument, which includes a rod assembly and an end actuator arranged at one end of the rod assembly, the end actuator includes a nail magazine seat and a nail support seat pivotally connected to the nail magazine seat, the nail magazine assembly is detachably installed in the nail magazine seat, the rod assembly includes a pusher member, a part of the pusher member is located in the end actuator, and the nail magazine assembly is a nail magazine assembly as described in any one of the above items.

[0013] Furthermore, the pusher member includes a main body and an additional part extending from the front side surface of the main body, the main body is provided with a first recess formed inwardly from the front side surface, the opening of the first recess is arranged toward the additional part, the inner wall surface of the first recess is a circular arc surface, and the additional part is provided with a second recess formed downwardly recessed from its top surface.

[0014] The beneficial effect of the present invention is that the cutting knife is rotatably connected to the pusher, and in the initial (unused) state or the cutting completed state, the cutting edge of the blade is located in the groove and faces downward, and will not be exposed and will not damage the patient's tissue and the doctor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic structural diagram of the end effector and the blade pusher of the stapler of the present invention;

[0016] Figure 2 yes Figure 1 An exploded perspective view of the end effector and the pusher member;

[0017] Figure 3 yes Figure 2 An enlarged view of the circled portion shown;

[0018] Figure 4 yes Figure 2 A perspective exploded view of the staple cartridge assembly and the pusher member;

[0019] Figure 5 yes Figure 4 An enlarged view of the circled portion shown;

[0020] Figure 6 yes Figure 4 The schematic diagram of the structure of the pusher, cutting knife, rod and pusher member shown;

[0021] Figure 7 yes Figure 6 An enlarged view of the circled portion shown;

[0022] Figure 8 yes Figure 6 An exploded perspective view of the pusher, cutting blade, rod and pusher member shown;

[0023] Figure 9 yes Figure 8 Magnified view of the circled portion shown. DETAILED DESCRIPTION

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described in detail, examples of which are illustrated in the accompanying drawings.

[0025] 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 the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two or three, unless otherwise specifically defined. "Several" means at least one.

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0027] like Figures 1 to 2As shown, the present invention discloses a stapler (not shown), which includes a handle assembly, a shaft assembly extending from the handle assembly, and an end actuator 100 arranged at one end of the shaft assembly. The handle assembly includes a body and a transmission mechanism installed on the body, the transmission mechanism is connected to the shaft assembly, and the transmission mechanism drives the shaft assembly to move forward or backward. The end actuator 100 includes a staple cartridge seat 10 and a staple support 20 pivotally connected to the staple cartridge seat 10, the staple cartridge assembly 30 can be engaged in the staple cartridge seat 10, and can also be removed from the staple cartridge seat 10, that is, the staple cartridge assembly 30 can be detachably installed in the staple cartridge seat 10, and the staple cartridge assembly 30 includes a staple cartridge 40 and a cutting knife 50. The shaft assembly includes a pusher member 60, a portion of which is located in the end actuator 10, and the pusher member 60 is used to drive the cutting knife 50 to move forward or backward. As used herein, the terms "front" and "rear" are relative to the clinician manipulating the handle assembly of the stapler 100. The term "rear" refers to the direction toward the clinician, and the term "front" refers to the direction away from the clinician. As used herein, the term "longitudinal direction" refers to the direction extending from front to back, and the term "transverse direction" refers to the direction perpendicular to the longitudinal direction. As used herein, the terms "upper" and "lower" are relative, i.e., the "anvil 20" is "upper" and the "stapling cartridge holder 10" is "lower." The term "disposed" is used throughout this document to indicate the connection or positional relationship between two components.

[0028] Combine Figures 3 to 5 As shown, the staple cartridge 40 includes staples (not shown) and a staple pusher (not shown), a staple cartridge body 41 extending in the longitudinal direction, a pusher 42 and a bracket 43 mounted on the staple cartridge body 41, and the bracket 43 movably mounts the pusher 42 to the staple cartridge body 41. The cutting blade 50 is rotatably connected to the pusher 42. The staple cartridge body 41 is provided with a plurality of staple cavities (not numbered), in which a portion of the staple pusher and the staples are disposed. The pusher 42 drives the staple pusher to move, and the staple pusher pushes the staples out. When the staple cartridge 40 is not in use, a cover (not shown) is provided on the staple cartridge 40 to prevent dust and the like from entering the staple cartridge 40. The staple cartridge body 41 is provided with a knife slot 410 in the longitudinal direction, in which the cutting blade 50 moves. The staple cartridge body 41 includes an insertion end 411 and a distal end 412. In the initial state, the cutter 50 and pusher 42 are both located at the distal end 412 of the staple cartridge body 41. The cutter pusher 60 is used to push against the cutter 50 and pusher 42, which in turn pushes against the staple pusher, which pushes the staples out of the staple cavities. The initial state refers to when the staple cartridge assembly 30 is not installed in the end effector 100.

[0029] Combine Figures 6 to 9As shown, the cutting knife 50 includes a blade portion 51 and a base portion 52 extending from the blade portion 51. The blade portion 51 has a cutting edge 510 for cutting tissue, and the base portion 52 has an arc-shaped corner portion 521. In the initial state or after the tissue is cut, the cutting edge 510 is located in the blade slot 410 and faces downward. The cutting edge 510 is not located above (i.e., not exposed to) the top surface of the staple magazine body 41. In the initial state, the base portion 52 exceeds the rear end surface of the staple magazine body 41, i.e., the arc-shaped corner portion 521 is located outside the staple magazine body 41. The blade portion 51 is provided with a through slot 53. The through slot 53 includes a first portion 54 and a second portion 55 connected to each other. The first portion 54 is an arc-shaped through hole, and the second portion 55 is an elongated through slot. The diameter of the first portion 54 is greater than the width of the second portion 55. The pusher 42 includes a limit block 421 and a push portion 422 located on both sides of the limit block 421. The limit block 421 is located in the knife slot 410. The limit block 421 has a groove 423 formed by a downward depression from its top surface. Each push portion 422 includes two parallel push blocks 426. The push blocks 426 are used to push the nail pusher. In the initial state or the cutting completion state, a portion of the blade portion 51 is located in the groove 423, that is, the cutting edge 510 is located in the groove 423 and faces the bottom of the groove 423. In this way, Figure 5 、 Figure 6 As shown, the cutting edge 510 faces downward and is not exposed, thereby preventing tissue damage. The groove 423 has two groove walls 424 arranged opposite each other, each of which is provided with a receiving hole 425. The staple cartridge assembly 30 also includes a rod 70. The rod 70 is inserted into the first portion 54 of the through groove 53, and its ends are respectively installed in the receiving holes 425 of the two groove walls 424. When the rod 70 is located in the first portion 54 of the through groove 53, the cutting blade 50 can rotate about the rod 70 in a first direction or a second direction, the first direction being opposite to the second direction. The pusher member 60 includes a main body 61 and an additional portion 62 extending from the front side of the main body 61. The main body 61 is provided with a first recess 63 formed inwardly from its front side. The opening of the first recess 63 is arranged toward the additional portion 62. The inner wall surface of the first recess 63 is a circular arc surface. The additional portion 62 is provided with a second recess 64 formed downwardly from its top surface.

[0030] When the staple cartridge assembly 30 is in use, the cover on the staple cartridge 40 is first removed, and then the staple cartridge assembly 30 in its initial state is installed into the staple cartridge seat 10. Specifically, the staple cartridge assembly 30 is installed into the staple cartridge seat 10 in an oblique downward direction, with the rear end of the staple cartridge assembly 30 first, and then the remaining portion of the staple cartridge assembly 30 is pivotally installed into the staple cartridge seat 10 with the rear end of the staple cartridge assembly 30 as the pivot axis. When the staple cartridge assembly 30 is installed into the staple cartridge seat 10, the arcuate corner portion 521 of the base portion 52 of the cutting blade 50 abuts against the first recess 63 of the main body portion 61 of the blade pusher 60. During the pivoting process, the arcuate corner portion 521 slides on the inner wall surface of the first recess 63. Under the guidance of the first recess 63, the arcuate corner portion 521 slides from the upper end of the first recess 63 to the lower end of the first recess 63. During this process, the cutting blade 50 rotates around the rod 70 in the first direction. After rotating 90°, the cutting edge 510 of the blade portion 51 is located above the knife slot 410 and the cutting edge 510 is facing the insertion end 411 of the nail magazine body 41, and the base 52 of the cutting knife 50 falls into the second recess 64. At this time, the main body 61 of the pushing member 60 pushes the base 52 of the cutting knife 50 forward, causing the cutting knife 50 to move forward. In the process of the cutting knife 50 moving forward, the position of the rod 70 moves from the first end 531 of the through slot 53 to the second end 532. When the rod 70 moves from the first end 531 of the through slot 53 to the second end 532, the main portion 61 of the pusher member 60 abuts the base 52 of the cutting blade 50 and the stopper 421 of the pusher 42. The additional portion 62 of the pusher member 60 also abuts the pusher 42. At this point, the main portion 61 of the pusher member 60 continues to push forward against the base 52 of the cutting blade 50 and the stopper 421 of the pusher 42, while the additional portion 62 pushes forward against the pusher 42. The pusher 42 and the cutting blade 50 move forward simultaneously, and the cutting edge 510 of the blade portion 51 cuts tissue as it moves forward. When the cutting blade 50 moves from the end 412 of the staple cartridge body 41 to the insertion end 411 of the staple cartridge body 41, tissue cutting is complete. Due to the friction between the pusher 42 and the staple cartridge body 41, a sufficiently large force must be applied to the pusher 42 to move the pusher 42. When the tissue cutting is completed, the pusher member 60 is moved backward. Since the base 52 of the cutting knife 50 is located in the second recess 64 of the additional portion 62 of the pusher member 60, the additional portion 62 drives the cutting knife 50 to move backward. During the backward movement of the cutting knife 50, the position of the rod member 70 returns from the second end 532 of the through slot 53 to the first end 531, that is, the rod member 70 returns to the first part 54 of the through slot 53.The pusher member 60 continues to move backward, and the pusher member 60 applies a backward force to the cutting knife 50, and the cutting knife 50 applies a backward force to the pusher 42. Due to the friction between the pusher 42 and the nail magazine body 41, this force cannot drag the pusher 42 backward, and this force causes the arc-shaped corner 521 of the base 52 of the cutting knife 50 to slide from the lower end of the first recess 63 to the upper end of the first recess 63. During this process, the cutting knife 50 rotates 90° around the rod 70 in the second direction, which is opposite to the first direction. After the rotation is completed, the cutting edge 510 is located in the groove 423 and faces the bottom of the groove 423. At this time, the base 52 of the cutting knife 50 is separated from the second recess 64 of the additional part 62. During the process of continuing to move backward, the pusher member 60 will not drive the cutting knife 50 and the pusher 42 to move backward, that is, the cutting knife 50 and the pusher 42 remain at the insertion end 411 of the nail magazine body 41.

[0031] To sum up, when the nail magazine assembly 30 is in the initial (unused) state, the cutting edge 510 of the blade portion 51 of the cutting knife 50 is located in the groove 423 of the limit block 421 of the pusher 42 and faces the bottom of the groove 423, and the cutting edge 510 of the blade portion 51 will not be damaged by foreign objects; when the nail magazine assembly 30 is installed in the nail magazine seat 10, the cutting edge 510 of the blade portion 51 rotates relative to the limit block 421 to above the knife slot 410; in the process of the cutting knife 50 moving in the knife slot 410, the cutting edge 510 of the blade portion 51 cuts the tissue; when the tissue cutting is completed, the blade portion 51 rotates relative to the limit block 421 until the cutting edge 510 of the blade portion 51 is located in the groove 423 of the limit block 421 and faces the bottom of the groove 423. In the present invention, regardless of whether the cutting knife 50 is in the initial (unused) state or the cutting-completed state, the cutting edge 510 of the blade portion 51 will neither damage the patient's tissue nor be damaged by foreign objects, nor will it injure the doctor when the doctor replaces the staple cartridge.

[0032] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention, and the technical solutions after such changes, modifications, replacements and modifications are all within the scope of protection of the present invention.

Claims

1. A staple cartridge assembly for a surgical instrument, the surgical instrument comprising a staple cartridge seat and a blade pusher, the blade pusher having a first recessed portion formed inwardly from a front side thereof; the staple cartridge assembly comprising a staple cartridge and a cutting blade; the staple cartridge comprising a staple, a staple pusher, and a staple cartridge body extending in a longitudinal direction, the staple cartridge body being provided with a staple cavity, the staple being received in the staple cavity, the staple pusher being used to push the staple out of the staple cavity; the staple cartridge further comprising a pusher for pushing the staple pusher; The cutting knife includes a blade portion having a cutting edge; the cutting knife is characterized in that: The cutting blade is rotatably connected to the pusher, and in an initial state or a cutting-completed state, the cutting edge is not exposed above the top surface of the staple cartridge body; the cutting blade further includes a base portion extending from the blade portion, the base portion having an arc-shaped corner portion, and in an initial state, the arc-shaped corner portion is located outside the staple cartridge body; In response to the nail magazine assembly being installed into the nail magazine seat, the arc-shaped corner of the cutting knife slides along the inner wall surface of the first recess, so that the cutting knife rotates relative to the pusher to expose the cutting edge above the top surface of the nail magazine body.

2. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The nail magazine body is provided with a knife slot extending along the longitudinal direction; the pusher includes a limit block and a push portion located on both sides of the limit block, the limit block is located in the knife slot, and the cutting knife is rotatably connected to the limit block.

3. The staple cartridge assembly for a surgical instrument according to claim 2, wherein: The limiting block is provided with a groove which is recessed downward from the top surface thereof. In an initial state or a cutting completion state, the cutting edge is located in the groove.

4. The staple cartridge assembly for a surgical instrument according to any one of claims 1 to 3, characterized in that: The nail magazine assembly further includes a rod member arranged on the pusher, the cutting knife is provided with a through slot, and the rod member is passed through the through slot.

5. The staple cartridge assembly for a surgical instrument according to claim 4, wherein: The pusher includes a limit block and push parts located on both sides of the limit block. The limit block is provided with a groove formed by being recessed downward from its top surface. The groove includes two groove walls arranged opposite to each other. The rod is passed through the through groove and its ends are respectively installed on the two groove walls.

6. The staple cartridge assembly for a surgical instrument according to claim 4, wherein: The through slot includes a first part and a second part connected to each other, the first part is an arc-shaped through hole, the second part is an elongated through slot, and the diameter of the first part is greater than the width of the second part.

7. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The pusher member also has a second recess; in response to the nail magazine assembly being installed in the nail magazine seat, the arc-shaped corner of the cutting knife slides along the inner wall surface of the first recess until it falls into the second recess.

8. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The staple cartridge body includes an insertion end and a tail end; in an initial state, the cutting knife and the pusher are located at the tail end of the staple cartridge body.

9. A surgical instrument comprising a shaft assembly and an end effector disposed at one end of the shaft assembly, the end effector comprising a staple cartridge seat and an anvil pivotally connected to the staple cartridge seat, the staple cartridge seat having a staple cartridge assembly detachably mounted therein, the shaft assembly comprising a blade pusher, a portion of which is located within the end effector, characterized in that: The staple cartridge assembly is the staple cartridge assembly according to any one of claims 1 to 8.

10. The surgical instrument according to claim 9, wherein: The pusher member includes a main body and an additional part extending from the front side of the main body. The main body is provided with a first recessed portion formed inwardly from the front side. The opening of the first recess is arranged toward the additional part. The inner wall surface of the first recess is an arc surface. The additional part is provided with a second recessed portion formed downwardly from its top surface.

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