Jaw assembly for a laparoscopic stapler

Abstract

The application provides a jaw assembly of a laparoscope anastomat, wherein a cartridge base is connected with a driving rod through a joint structure and can swing left and right around a supporting shaft column of the joint structure; a back end of a stopper seat is rotationally connected with a shaft hole of the cartridge base through a rotating pin; the stopper seat is provided with an upper guide slot, a rear end of the upper guide slot is an open structure, and a pressing inclined surface and a horizontal retaining surface are arranged in positions close to an opening of the upper guide slot, a cutting knife can enter the horizontal retaining surface of the upper guide slot from the gap, and a vertical guide pin column and a spring are fixedly connected inside the cartridge base, and the spring abuts against an inner lower surface of the stopper seat. The jaw assembly of the laparoscope anastomat provided by the application is connected between the stopper seat and the cartridge base through a hinged mode, the back end of the stopper seat is open, the cutting knife can be connected with the stopper seat through the opening, and pressure is applied to the pressing inclined surface in the process of forward driving, so that the stopper seat is forced to close downward.

Description

Technical Field

[0001] This invention relates to the field of interventional medical device technology, and in particular to a jaw assembly of a laparoscopic anastomosis device. Background Technology

[0002] like Figure 1-3 As shown, conventional staplers use an anvil that flips open. The anvil has a guide groove in the middle, closed at both ends, and a notch near the rear end of the guide groove. The guide grooves on both sides of the notch are inclined upwards. The cutting blade tip is inserted into the guide groove through the notch. In this structure, the anvil is closed by a drive sleeve pushing the anvil forward, which in turn forces the anvil to close downwards. The disadvantage of this structure is that the connection between the cutting blade and the anvil requires the drive sleeve to press the anvil, causing the anvil to move forward and downward simultaneously, so that the notch fits onto the cutting blade tip. This requires extremely high precision in the entire motion mechanism. At the same time, because the guide grooves on both sides of the anvil notch are inclined upwards, when the anvil is opened, it must be ensured that the cutting blade tip can disengage from the notch of the anvil, separating the cutting blade tip from the anvil. This also requires high operational precision. Furthermore, the anvil seat is currently driven by the drive sleeve, which can only be driven by external force applied to the drive rod. However, external force cannot be applied through the internal motor and transmission mechanism of the stapler (otherwise, the outer wall of the drive rod would need to be opened). Therefore, staplers with this structure are currently operated manually. When the stapler is closed manually, thicker tissues need to be clamped during the operation. This force can only be achieved by the doctor manually, which requires a high level of strength and accuracy from the doctor (the manual operation should not cause shaking due to force).

[0003] Furthermore, in existing stapler technology, the anvil opening action is achieved by the outer sleeve on the drive rod retracting, which in turn drives the anvil's shaft to retract within the inclined groove of the staple cartridge base, thus opening the anvil. This results in significant uncertainty during the anvil opening process. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a jaw assembly for a laparoscopic anastomosis device, thereby solving the problem of the complex cooperation structure between the anvil and the cutting blade during opening and closing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides a jaw assembly for a laparoscopic anastomosis device, including an anvil (10) and a staple cartridge base (20), wherein the staple cartridge base (20) is connected to a drive rod through a joint structure and can swing left and right around the support axis of the joint structure; the rear end of the anvil (10) is rotatably connected to the shaft hole of the staple cartridge base (20) through a rotating pin (91); the anvil (10) is provided with an upper guide groove (11), the rear end of the upper guide groove (11) is an open structure, and near the upper guide groove (11) The opening is set as a downwardly inclined pressing slope (11a) and a horizontal holding surface (11b), and the cutting blade (50) can enter the horizontal holding surface of the upper guide groove (11) from the notch; and a vertical guide pin (23) is fixedly connected inside the nail box base (20) between the rotating shaft and the nail box fixed position. A spring (22) is sleeved on the guide pin (23), and the top of the spring (22) abuts against the inner lower surface of the nail seat (10) and is pressed by the nail seat (10) to form a rebound force.

[0006] The joint structure includes an upper joint block (30) and a lower joint block (40), wherein the lower joint block (40) is installed in the mounting groove of the nail box base (20), the upper joint block (30) and the lower joint block (40) are connected vertically, the blade conductor (31) at the front end of the upper joint block (30) is connected in the nail seat (10) to support the structures on both sides of the upper guide groove (11) of the nail seat (10); the blade conductor (31) is also connected to the rotating pin (91) to fix the blade conductor (31) to the nail box base (20).

[0007] The rear ends of the pin seat (10) are respectively provided with inclined abutment portions (12). When the pin seat (10) is pushed open by the spring (22), the abutment portions (12) abut against the vertical abutment surface (32) at the front end of the upper joint block (30). The abutment part (12) has an inclined surface (12a) at the rear end near the inner side of the cutting blade.

[0008] The front end of the upper joint block (30) is a knife bar conductor (31) with a knife bar guide groove (31a). The knife bar conductor (31) and the side walls of the nail box base (20) on both sides are provided with shaft holes. The rear side walls of the anvil seat (10) are also provided with shaft holes. The rotating pin (91) is inserted into the shaft holes of the anvil seat (10), the nail box base (20) and the knife bar conductor (31) through a rotating pin (91), so that the side walls of the anvil seat (10) are clamped between the knife bar conductor (31) and the side walls of the nail box base on both sides.

[0009] The lower joint block (40) has a protruding structure (41) at its front end. A second gap is formed between the lower part of the protruding structure (41) and the mounting groove of the nail cartridge base (20). The safety spring (92) is clamped in the second gap. A first gap is formed between the lower part of the knife bar conductor (31) and the mounting groove of the nail cartridge base (20). The size of the first gap is larger than the second gap so as to allow the safety spring (92) to undergo elastic deformation in the first gap.

[0010] The cutting blade (50) includes a blade body (51) and a blade shank (52). The blade body (51) includes an upper guide block (51a), a lower guide block (51b), and a safety block (51c). The upper guide block (51a) and the lower guide block (51b) are located at the upper and lower ends of the conductor (51), respectively. The safety block (51c) is located above the lower guide block (51b) and maintains a gap with the lower guide block (51b).

[0011] The nail box base (20) is provided with a lower guide groove (21) parallel to the upper guide groove (11). The upper guide block (51a) is slidably connected to the guide rail at the upper part of the upper guide groove (11), and the lower guide block (51b) is slidably connected to the guide rail at the lower part of the lower guide groove (21). Directly below the position where the pressing slope (11a) connects with the guide rail at the upper part of the upper guide groove (11), a protrusion (21a) is provided at the upper part of the lower guide groove (21). The distance between the upper surface of the protrusion (21a) and the guide rail surface at the lower part of the lower guide groove (21) is less than the distance between the safety block (51c) and the lower guide block (51b). Thus, when the cutting blade (50) is triggered by the safety spring (92) and moves downward, the safety block (51c) abuts against the protrusion (21a).

[0012] Two rotating pins (91) are respectively connected to the knife bar conductor (31) of the upper joint block (30) after passing through the shaft holes of the nail box base (20) and the nail abutment (10) from both sides of the nail box base (20).

[0013] The lower joint block (40) and the upper joint block (30) are respectively provided with flared structures at their rear ends to facilitate the left and right rotation of the jaw assembly. The upper joint block (30) and the lower joint block (40) are connected by vertical connecting pins on both sides of the flared structure, one of which serves as a rotation drive shaft. The protruding structure (41) at the front end of the lower joint block (40) is fixedly connected to the mounting groove of the nail box base (20). The upper joint block (30) is longer than the lower joint block. A recessed knife bar conductor (31) is provided on the upper joint block (30) at the front end of the lower joint block (40). The knife bar conductor (31) is fixedly connected to the nail abutment (10) and the nail box base (20) by a rotating pin.

[0014] The lower center of the tool bar conductor (31) is provided with a tool bar guide groove (31a) to allow the tool bar to pass through; The lower part of the lower joint block (40) and the upper part of the upper joint block (30) are provided with coaxially arranged support shafts: the lower support shaft (42) of the lower joint block (40) and the upper support shaft (33) of the upper joint block (30), which are used to connect with the connecting piece at the end of the drive rod. The two side walls of the blade conductor (31) and the nail box base (20) clamp the side walls on both sides of the rear end of the nail seat (10), so that the nail seat (10) can rotate around the connection position of the nail box base (20).

[0015] The blade conductor (31) of the upper joint block (30) sinks into the mounting groove of the nail box base (20) and forms a spatial docking relationship with the protruding structure (41) of the lower joint block (40).

[0016] The stapler jaw assembly fixed connection structure includes an anvil (10), a staple cartridge base (20), an upper joint block (30), and a lower joint block (40). The jaw assembly of the laparoscopic anastomosis device provided by this invention has an anvil and a cartridge base connected by a hinge. The rear end opening of the anvil allows the cutting blade to connect to the anvil through the opening and apply pressure to the pressure ramp during forward drive, thereby forcing the anvil to close downward. If there is no cartridge in the cartridge base or it has been fired, the safety spring will trigger the cutting blade, causing the safety block of the cutting blade to abut against the protrusion of the cartridge base, restricting the forward drive of the cutting blade. The anvil structure in the middle is clamped and fixed by the blade conductor and the side walls of the cartridge base on both sides. The blade conductor supports the anvil from the inside, and the cartridge base limits the anvil from the outside.

[0017] This invention provides pivot support from both the top and bottom directions by connecting the upper and lower joint blocks. The lower connecting block is fixedly connected to the nail box base, while the upper connecting block is hinged to the nail seat and the nail box base through the front end of the blade conductor. This creates an exceptionally robust structure between the upper and lower joint blocks and the nail box base, providing stable support for the nail seat and the drive rod connection.

[0018] This invention uses a fixed rotating shaft and spring to spring open the anvil, avoiding the left and right deflection and jamming of the anvil during opening and closing caused by the double-sided inclined slide. It also eliminates the need to design inclined slides for the forward and backward movement of the anvil shaft, which can significantly reduce production costs and improve the performance. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of the stapler anvil in the prior art; Figure 2 This is a schematic diagram of the jaw assembly of a conventional stapler. Figure 3 for Figure 1 A magnified view of a portion of the image; Figure 4 This is a schematic diagram of the jaw assembly (including the drive rod) of the laparoscopic anastomosis device of the present invention. Figure 5 for Figure 5 A magnified view of a portion of the image; Figure 6 This is a schematic diagram of the jaw assembly of the laparoscopic anastomosis device of the present invention; Figure 7 This is an exploded structural diagram of the jaw assembly of the laparoscopic anastomosis device of the present invention; Figure 8 This is a schematic diagram of the cutting blade. Figure 9 This is a schematic diagram of the upper joint block; Figure 10 This is a schematic diagram of the lower joint block; Figure 11 This is a schematic diagram of the connection between the upper and lower joint blocks; Figure 12 This is a cross-sectional view of the jaw assembly; Figure 13 for Figure 12 A magnified view of a portion of the image; Figure 14 This is a schematic diagram of the jaw assembly. Figure 15 for Figure 14 A magnified view of a portion of the image; Figure 16 This is a longitudinal sectional view of the jaw assembly in the open state (the cutting plane is the plane where the spring is located). Figure 17 for Figure 16 A magnified view of a portion of the image; Figure 18 This is a top view of the jaw assembly; Figure 19 for Figure 18 Sectional view of section AA; Figure 20 for Figure 18 Sectional view of section BB.

[0020] In the picture: 10-Anvil seat; 11-Upper guide groove; 11a-Compression slope; 11b-Horizontal retaining surface; 12-Abutting part; 12a-Inclined surface; 20-Nailing box base; 21-Lower guide groove; 21a-Protrusion; 22-Spring; 23-Guide pin; 30 - Upper joint block; 31 - Tool bar conductor; 31a - Tool bar guide groove; 32 - Vertical contact surface; 33 - Upper support shaft column; 40 - Lower joint block; 41 - Protruding structure; 42 - Lower support shaft column; 50-Cutting blade; 51-Blade body; 51a-Upper guide block; 51b-Lower guide block; 51c-Safety block; 52-Blade shank; 60-Drive lever; 91-Rotating pin; 92-Safety spring. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Example like Figure 4-20As shown, the present invention provides a jaw assembly for a laparoscopic anastomosis device, including an anvil 10 and a staple cartridge base 20. The staple cartridge base 20 is connected to a drive rod 60 via a joint structure and can swing left and right around the support shaft of the joint structure. The rear end of the anvil 10 is rotatably connected to the shaft hole of the staple cartridge base 20 via a rotating pin 91. The anvil 10 is provided with an upper guide groove 11. The rear end of the upper guide groove 11 is an open structure. Near the opening of the upper guide groove 11, a downwardly inclined pressing slope 11a and a horizontal holding surface 11b are provided. The cutting blade 50 can enter the horizontal holding surface of the upper guide groove 11 through the notch. A vertical guide pin (23) is fixedly connected inside the staple cartridge base (20) between the rotating shaft and the fixed position of the staple cartridge. A spring (22) is sleeved on the guide pin (23), and the top of the spring (22) abuts against the inner lower surface of the anvil (10) and is pressed by the anvil (10) to form a rebound force.

[0025] The anvil provided in this embodiment differs significantly from the anvil structure in the prior art, and the connection and working mode of the cutting blade are also different. In the prior art, the anvil closure is achieved through an external sleeve structure, while in this invention, the anvil closure is achieved by the cutting blade pressing against the pressure ramp 11a. In the prior art, the cutting blade needs to enter the notch of the anvil during the anvil closure process, while in this invention, the cutting blade enters through the opening structure at the rear end of the upper guide groove 11. Even if the anvil flips upwards and opens, the cutting blade and the upper guide groove will not completely disengage as in the prior art; instead, the cutting blade limits the pressure ramp 11a. In this invention, the anvil is hinged to the nail cartridge base via a rotating pin, while in the prior art, the anvil is connected via an inclined sliding groove structure. The prior art lacks a spring structure design, relying solely on the external sleeve to drive the locking block at the rear end of the anvil to flip and open. This invention uses a spring structure, which automatically springs open the anvil after the external pressure is released.

[0026] Compared with the jaw structure of the prior art, the jaw assembly of the laparoscopic anastomosis device of the present invention has an anvil and a clip base connected by a hinge. The rear end opening of the anvil allows the cutting blade to connect to the anvil through the opening and apply pressure to the pressure ramp during forward drive, thereby forcing the anvil to close downward. If there is no clip in the clip base or it has been fired, the safety spring will trigger the cutting blade, causing the safety block of the cutting blade to abut against the protrusion of the clip base, restricting the forward drive of the cutting blade. The anvil structure in the middle is clamped and fixed by the blade conductor and the side walls of the clip base on both sides. The blade conductor supports the anvil from the inside, and the clip base limits the anvil from the outside.

[0027] The joint structure includes an upper joint block 30 and a lower joint block 40. The lower joint block 40 is installed in the mounting groove of the nail cartridge base 20. The upper joint block 30 and the lower joint block 40 are connected vertically. The blade conductor 31 at the front end of the upper joint block 30 is connected to the nail abutment 10 to support the structures on both sides of the upper guide groove 11 of the nail abutment 10. The blade conductor 31 is also connected to the rotating pin 91 to fix the blade conductor 31 to the nail cartridge base 20.

[0028] The lower joint block 40 has a protruding structure 41 at its front end. A second gap is formed between the lower part of the protruding structure 41 and the mounting groove of the nail cartridge base 20. The safety spring 92 is clamped in the second gap. A first gap is formed between the lower part of the knife bar conductor 31 and the mounting groove of the nail cartridge base 20. The size of the first gap is larger than the second gap, so as to allow the safety spring 92 to undergo elastic deformation in the first gap.

[0029] The cutting blade 50 includes a blade body 51 and a blade shank 52. The blade body 51 includes an upper guide block 51a, a lower guide block 51b, and a safety block 51c. The upper guide block 51a and the lower guide block 51b are located at the upper and lower ends of the conductor 51, respectively. The safety block 51c is located above the lower guide block 51b and maintains a distance from the lower guide block 51b.

[0030] The nail box base 20 is provided with a lower guide groove 21 parallel to the upper guide groove 11. The upper guide block 51a is slidably connected to the guide rail at the upper part of the upper guide groove 11, and the lower guide block 51b is slidably connected to the guide rail at the lower part of the lower guide groove 21. Directly below the position where the pressing slope 11a connects with the guide rail at the upper part of the upper guide groove 11, a protrusion 21a is provided at the upper part of the lower guide groove 21. The distance between the upper surface of the protrusion 21a and the guide rail surface at the lower part of the lower guide groove 21 is less than the distance between the safety block 51c and the lower guide block 51b. Thus, when the cutting blade 50 is triggered by the safety spring 92 and moves downward, the safety block 51c abuts against the protrusion 21a.

[0031] Two rotating pins 91 are respectively connected to the knife rod conductor 31 of the upper joint block 30 after passing through the shaft holes of the nail box base 20 and the nail abutment 10 from both sides of the nail box base 20 inward.

[0032] The lower joint block 40 and the upper joint block 30 are respectively provided with flared structures at their rear ends to facilitate the left and right rotation of the jaw assembly. The upper joint block 30 and the lower joint block 40 are connected by vertical connecting pins on both sides of the flared structure. One of the connecting pins serves as the rotation drive shaft. In this embodiment, during the connection process of the two connecting pins of the upper and lower joint blocks, the upper and lower connecting blocks at the position of one connecting pin directly form a mating surface, while a gap is maintained between the upper and lower joint blocks of the other connecting pin to allow the drive piece to connect to the connecting pin. Specifically, the corresponding position of the lower connecting block is set as a concave notch, and an arc-shaped edge is formed around the notch. The protruding structure 41 at the front end of the lower joint block 40 is fixedly connected to the mounting groove of the nail cartridge base 20. The upper joint block 30 is longer than the lower joint block 40. A recessed blade conductor 31 is provided at the front end of the upper joint block 30 of the lower joint block 40. The blade conductor 31 is fixedly connected to the nail abutment 10 and the nail cartridge base 20 by a rotating pin.

[0033] This invention provides pivot support from both the top and bottom directions by connecting the upper and lower joint blocks. The lower connecting block is fixedly connected to the nail box base, while the upper connecting block is hinged to the nail seat and the nail box base through the front end of the blade conductor. This creates an exceptionally robust structure between the upper and lower joint blocks and the nail box base, providing stable support for the nail seat and the drive rod connection.

[0034] The lower center of the tool bar conductor 31 is provided with a tool bar guide groove 31a, which allows the tool bar to pass through. The tool bar guide groove 31a can guide the movement of the tool bar and limit the two sides of the tool bar, thereby enabling the tool bar to move forward in a straight line.

[0035] The lower part of the lower joint block 40 and the upper part of the upper joint block 30 are provided with coaxially arranged support shafts: the lower support shaft 42 of the lower joint block 40 and the upper support shaft 33 of the upper joint block 30, which are used to connect with the connecting piece at the end of the drive rod. The specific connection method is pin connection, which is a conventional connection method.

[0036] The two side walls of the blade conductor 31 and the nail box base 20 clamp the side walls on both sides of the rear end of the nail holder 10, so that the nail holder 10 can rotate around the connection position of the nail box base 20.

[0037] The protruding structure 41 has a slot in the middle to allow the tool holder to pass through.

[0038] The blade conductor 31 of the upper joint block 30 sinks into the mounting groove of the nail box base 20 and forms a spatial docking relationship with the protruding structure 41 of the lower joint block 40.

[0039] It also includes safety spring 92; A first gap is formed between the lower part of the blade conductor 31 and the bottom surface of the mounting groove of the nail box base 20, and a second gap is formed between the lower part of the protruding structure 41 and the bottom surface of the mounting groove of the nail box base 20; wherein, the size of the first gap is larger than the size of the second gap; The root of the safety spring 92 is held in a second gap by the protruding structure 41 and the nail box base 20 to allow it to undergo elastic deformation in the first gap.

[0040] The lower joint block 40 is connected to the rear end of the nail cartridge base 20, the upper joint block 30 is connected to the lower joint block 40, the rear end of the nail abutment 10 is rotatably connected to the shaft hole of the nail cartridge base 20 through a rotating shaft; and a vertical guide pin 23 is fixedly connected inside the nail cartridge base 20 between the rotating shaft and the nail cartridge fixed position, a spring 22 is sleeved on the guide pin 23, and the spring 22 is compressed by the nail abutment 10 to form a rebound force.

[0041] The anvil 10 is flipped open relative to the nail box base 20 via a rotating shaft and opened by the elastic force of the spring 22. The structure is simple and easy to process and manufacture, and the requirements for processing accuracy are greatly reduced compared with the existing technology. The rotating shaft itself does not move, so there is no need to cut the cylindrical surface of the rotating shaft to form a plane, and there is no need to perform precision processing on the inclined slide structure, thus controlling the overall production cost. The reduction in production cost also makes the product more competitive.

[0042] Two guide pins 23 and two springs 22 are provided, located on both sides of the cutting blade bar. The guide pins 23 are arranged symmetrically on both sides. The height of the guide pins 23 should be higher than half the height of the spring 22 after compression to prevent the spring from popping out and falling.

[0043] When the anvil 10 is closed with the nail box base 20, the height of the guide pin 23 does not exceed the height of the anvil 10 at the position where it is abutted by the spring 22, thereby avoiding interference between the guide pin 23 and the anvil 10.

[0044] The rear ends of the anvil 10 are provided with inclined abutment portions 12 on both sides. When the anvil 10 is opened by the spring 22, the abutment portions 12 abut against the vertical abutment surface 32 at the front end of the upper joint block 30. The abutment portions 12 are supported by the vertical abutment surface 32 through surface contact, so that after the abutment portions 12 reach the vertical abutment surface 32, the opening angle of the anvil 10 reaches the maximum and is limited and fixed by the vertical abutment surface 32.

[0045] The rear end of the abutment part 12 near the inner side of the cutting blade is provided with an inclined surface 12a. The inclined surface 12a can reserve space for the installation of the upper joint block 30. The inclined surface itself also has a guiding function. A V-angle shape is formed between the two inclined surfaces 12a, thereby avoiding sharp edges.

[0046] The front end of the upper joint block 30 is a knife bar conductor 31 with a knife bar guide groove 31a. The knife bar conductor 31 and the side walls of the nail box base 20 on both sides are respectively provided with shaft holes. The rear side walls of the nail seat 10 are also respectively provided with shaft holes. The rotating pin 91 is inserted into the shaft holes of the nail seat 10, the nail box base 20 and the knife bar conductor 31, so that the side walls of the nail seat 10 are clamped between the knife bar conductor 31 and the side walls of the nail box base on both sides.

[0047] In this embodiment, the rear end of the anvil 10 is clamped and fixed by the knife bar conductor 31 and the nail box base 20, so that the anvil 10 will not move laterally, but can only be flipped open around the pivot.

[0048] This invention uses a fixed rotating shaft and spring to spring open the anvil, avoiding the left and right deflection and jamming of the anvil during opening and closing caused by the double-sided inclined slide. It also eliminates the need to design inclined slides for the forward and backward movement of the anvil shaft, which can significantly reduce production costs and improve the performance.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A jaw assembly of a laparoscopic stapler, comprising an anvil (10) and a staple cartridge base (20), wherein the staple cartridge base (20) is connected to a drive rod via a joint structure, characterized in that, It can swing left and right around the support shaft of the joint structure; the rear end of the anvil (10) is rotatably connected to the shaft hole of the nail box base (20) through the rotating pin (91); the anvil (10) is provided with an upper guide groove (11), the rear end of the upper guide groove (11) is an open structure, and a downwardly inclined pressing slope (11a) and a horizontal holding surface (11b) are provided near the opening of the upper guide groove (11), and the cutting blade (50) can enter the horizontal holding surface of the upper guide groove (11) from the notch; and a vertical guide pin (23) is fixedly connected inside the nail box base (20) between the rotating shaft and the nail box fixed position, and a spring (22) is sleeved on the guide pin (23), and the top of the spring (22) abuts against the inner lower surface of the anvil (10) and is pressed by the anvil (10) to form a rebound force.

2. The jaw assembly of the laparoscopic anastomosis device according to claim 1, characterized in that, The joint structure includes an upper joint block (30) and a lower joint block (40), wherein the lower joint block (40) is installed in the mounting groove of the nail box base (20), the upper joint block (30) and the lower joint block (40) are connected vertically, the blade conductor (31) at the front end of the upper joint block (30) is connected in the nail seat (10) to support the structures on both sides of the upper guide groove (11) of the nail seat (10); the blade conductor (31) is also connected to the rotating pin (91) to fix the blade conductor (31) to the nail box base (20).

3. The jaw assembly of the laparoscopic anastomosis device according to claim 2, characterized in that, The rear ends of the pin seat (10) are respectively provided with inclined abutment portions (12). When the pin seat (10) is pushed open by the spring (22), the abutment portions (12) abut against the vertical abutment surface (32) at the front end of the upper joint block (30). The abutment part (12) has an inclined surface (12a) at the rear end near the inner side of the cutting blade.

4. The jaw assembly of the laparoscopic anastomosis device according to claim 3, characterized in that, The front end of the upper joint block (30) is a knife bar conductor (31) with a knife bar guide groove (31a). The knife bar conductor (31) and the side walls of the nail box base (20) on both sides are provided with shaft holes. The rear side walls of the anvil seat (10) are also provided with shaft holes. The rotating pin (91) is inserted into the shaft holes of the anvil seat (10), the nail box base (20) and the knife bar conductor (31) through a rotating pin (91), so that the side walls of the anvil seat (10) are clamped between the knife bar conductor (31) and the side walls of the nail box base on both sides.

5. The jaw assembly of the laparoscopic anastomosis device according to claim 2, characterized in that, The lower joint block (40) has a protruding structure (41) at its front end. A second gap is formed between the lower part of the protruding structure (41) and the mounting groove of the nail cartridge base (20). The safety spring (92) is clamped in the second gap. A first gap is formed between the lower part of the knife bar conductor (31) and the mounting groove of the nail cartridge base (20). The size of the first gap is larger than the second gap so as to allow the safety spring (92) to undergo elastic deformation in the first gap.

6. The jaw assembly of the laparoscopic anastomosis device according to claim 2, characterized in that, The cutting blade (50) includes a blade body (51) and a blade shank (52). The blade body (51) includes an upper guide block (51a), a lower guide block (51b), and a safety block (51c). The upper guide block (51a) and the lower guide block (51b) are located at the upper and lower ends of the conductor (51), respectively. The safety block (51c) is located above the lower guide block (51b) and maintains a gap with the lower guide block (51b).

7. The jaw assembly of the laparoscopic anastomosis device according to claim 6, characterized in that, The nail box base (20) is provided with a lower guide groove (21) parallel to the upper guide groove (11). The upper guide block (51a) is slidably connected to the guide rail at the upper part of the upper guide groove (11), and the lower guide block (51b) is slidably connected to the guide rail at the lower part of the lower guide groove (21). Directly below the position where the pressing slope (11a) connects with the guide rail at the upper part of the upper guide groove (11), a protrusion (21a) is provided at the upper part of the lower guide groove (21). The distance between the upper surface of the protrusion (21a) and the guide rail surface at the lower part of the lower guide groove (21) is less than the distance between the safety block (51c) and the lower guide block (51b). Thus, when the cutting blade (50) is triggered by the safety spring (92) and moves downward, the safety block (51c) abuts against the protrusion (21a).

8. The jaw assembly of the laparoscopic anastomosis device according to claim 2, characterized in that, The lower joint block (40) and the upper joint block (30) are respectively provided with flared structures at their rear ends to facilitate the left and right rotation of the jaw assembly. The upper joint block (30) and the lower joint block (40) are connected by vertical connecting pins on both sides of the flared structure, one of which serves as a rotation drive shaft. The protruding structure (41) at the front end of the lower joint block (40) is fixedly connected to the mounting groove of the nail box base (20). The upper joint block (30) is longer than the lower joint block. A recessed knife bar conductor (31) is provided on the upper joint block (30) at the front end of the lower joint block (40). The knife bar conductor (31) is fixedly connected to the nail abutment (10) and the nail box base (20) by a rotating pin.

9. The jaw assembly of the laparoscopic anastomosis device according to claim 8, characterized in that, The lower center of the tool bar conductor (31) is provided with a tool bar guide groove (31a) to allow the tool bar to pass through; The lower part of the lower joint block (40) and the upper part of the upper joint block (30) are provided with coaxially arranged support shafts: the lower support shaft (42) of the lower joint block (40) and the upper support shaft (33) of the upper joint block (30), which are used to connect with the connecting piece at the end of the drive rod. The two side walls of the blade conductor (31) and the nail box base (20) clamp the side walls on both sides of the rear end of the nail seat (10), so that the nail seat (10) can rotate around the connection position of the nail box base (20).

10. The jaw assembly of the laparoscopic anastomosis device according to claim 2, characterized in that, The blade conductor (31) of the upper joint block (30) sinks into the mounting groove of the nail box base (20) and forms a spatial docking relationship with the protruding structure (41) of the lower joint block (40).

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