A limiting structure of a linear cutting stapler nail bin assembly of a cavity mirror

Abstract

The utility model relates to a kind of limit structure of endoscope linear cutting anastomat nail bin assembly, including the jaw assembly, outer sleeve and firing assembly sequentially connected along front-back direction;Jaw assembly includes nail seat and nail bin seat, and nail bin seat is equipped with nail bin;Nail bin is equipped with push block;Outer sleeve is equipped with cutting knife, and cutting knife bottom is equipped with cooperation groove;The rear end of push block is equipped with cooperation block;The length of cooperation groove is L1;Two limit structures are equipped in the nail bin seat, the rear end of nail bin is limited cooperation with two limit structures, and when nail bin is connected and fixed to nail bin seat, the distance between the rear end surface of nail bin and limit structure is L5, L5 < L1.Correct installation of nail bin can be ensured without equipping nail bin protective cover, so as to reduce the time cost of learning nail bin protective cover structure and effect, and nail bin can also be installed faster by operator during operation to carry out operation, improve operation efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a limiting structure for the staple cartridge assembly of a laparoscopic linear cutting stapler. Background Technology

[0002] A linear stapler is a medical device used in open surgery and laparoscopic procedures for the transection, resection, and / or anastomosis of digestive tract and lung tissues. The linear stapler uses a mechanical transmission mechanism to drive pre-placed staples arranged in multiple rows of parallel, staggered sections into the tissue to be anastomosed. After passing through the tissue, the staples are resisted by anterior anchors, bending inward to form a staggered "B"-shaped arrangement, permanently suturing the two tissue layers together. Because small blood vessels can pass through the gaps in the "B"-shaped staples, blood supply to the anastomosis site and distal areas is not affected. This type of anastomosis achieves a stable, well-balanced fit, promoting tissue healing.

[0003] Chinese patent CN202221119213.2 discloses a safety device for preventing secondary firing of the staple cartridge assembly in an electric laparoscopic anastomosis device. The device includes a base assembly, a staple cartridge assembly, and a cutting assembly. The staple cartridge seat has guide grooves and limiting pits at the ends of the guide grooves. A limiting post is also provided on the side of the cutting blade. The staple cartridge in this patent is a disposable consumable. During the transection, resection, and / or anastomosis of digestive tract and lung tissues, due to differences in surgical sites (such as stomach, intestines, blood vessels, etc.) and tissue thickness, as well as limitations in the staple cartridge cutting and anastomosis length, it may be necessary to replace the staple cartridge assembly multiple times to adapt to different tissue types and lengths. In practical application, this patent has revealed that some operators unfamiliar with the structure of the staple cartridge and its seat may neglect to install the staple cartridge protective cover onto the staple cartridge and may even insert the staple cartridge straight and upright into the seat. This installation method is defined here as incorrect.

[0004] Combination Figure 9 and Figure 10 With proper installation, first confirm the size of the staple cartridge and select a staple cartridge cover that matches the size. Install the cover on top of the staple cartridge, ensuring the bottom retaining strip of the cover passes through the cartridge and rests against the front of the push block. Then, insert the staple cartridge and cover into the cartridge holder at a certain angle. Finally, align the latching structure of the staple cartridge and cartridge holder at the appropriate position and secure it to fix the cartridge in place, ensuring a good fit between the push block and the cutting blade. Note that the staple cartridge will swing back and forth during this process to align with the latching position. If it moves too far backward, it needs to be pulled back forward.

[0005] Incorrect installation methods result in the push block's front end not being held in place by the limiting strip on the staple cartridge protective cover, pushing the staple cartridge into the cartridge holder. During the alignment process, if the staple cartridge's sliding stroke exceeds the length of the cutting blade's mating groove when adjusting it backward, the push block will be pushed forward by the cutting blade. Pulling the staple cartridge forward again to align it and fix its relative position to the cartridge holder will then prevent the push block from engaging with the mating groove. Finally, during surgery, without the push block's support, once the anastomosis is triggered, the cutting blade, propelled forward, will enter the limiting pit at the end of the guide groove, preventing the firing process from continuing and impacting the surgical progress. This problem not only increases the surgeon's time and the patient's costs but also potentially causes secondary surgical injuries and medical accidents. Utility Model Content

[0006] The purpose of this invention is to provide a limiting structure for the staple cartridge assembly of a laparoscopic linear cutting stapler, which allows the staple cartridge to be directly installed onto the staple cartridge seat without the need for a staple cartridge protective cover. It also prevents the push block from being pushed out by the cutting blade during installation, ensuring more accurate installation of the staple cartridge, effectively reducing the possibility of accidents during surgery, and thus enabling the surgery to be completed more quickly and effectively, reducing the operation time.

[0007] This utility model is achieved through the following technical solution:

[0008] A limiting structure for a stapler cartridge assembly of a laparoscopic linear cutting stapler, the main body of which is a linear cutting stapler. The linear cutting stapler includes a jaw assembly, an outer sleeve, and a firing assembly connected sequentially in the front-to-back direction. The jaw assembly includes a staple seat and a staple cartridge seat that are hinged to each other at their rear ends. A staple cartridge is installed inside the staple cartridge seat, and the staple cartridge and the staple cartridge seat are fixedly connected by a snap-fit ​​structure.

[0009] The staple cartridge contains a push block; the outer sleeve contains a cutting blade, the front end of which extends into the staple cartridge and is located behind the push block, and the bottom of the front side of the cutting blade has a mating groove; the rear end of the push block has a mating block for supporting the bottom mating groove of the cutting blade; the length of the mating groove is L1.

[0010] The staple cartridge holder has two limiting structures, which are symmetrically located on the left and right sides of the rear of the staple cartridge holder. The rear end of the staple cartridge is limited and engaged with the two limiting structures. When the staple cartridge is snapped into place and fixed to the staple cartridge holder, the distance between the rear end face of the staple cartridge and the limiting structure is L5, where L5 < L1.

[0011] Compared with previous technologies, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model can ensure the correct installation of the staple cartridge without the need for a staple cartridge protective cover, thereby reducing the time cost of learning the structure and function of the staple cartridge protective cover. It also allows the surgeon to install the staple cartridge more quickly during surgery, improving surgical efficiency and safety.

[0013] 2. This utility model enables the surgery to be completed more quickly and effectively during the operation, reducing the operation time to a certain extent, reducing unnecessary harm to the patient, and preventing the need for a second operation if the operation fails. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the staple cartridge holder of this utility model when a staple cartridge is installed;

[0015] Figure 2 A schematic diagram of the mating structure between the rear end of the push block and the front end of the cutting blade.

[0016] Figure 3 This is a schematic diagram of the structure of the nail cartridge holder of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of a nail cartridge holder in the prior art;

[0018] Figure 5 This is a schematic diagram of the linear cutting anastomosis device of this utility model;

[0019] Figure 6 A schematic diagram to match the length L1 of the groove structure;

[0020] Figure 7 A schematic diagram showing the length L2 of the staple cartridge structure and the length L3 of the staple cartridge seat structure in the prior art;

[0021] Figure 8 A schematic diagram showing the length L2 of the staple cartridge structure and the length L4 of the staple cartridge seat structure of this utility model;

[0022] Figure 9 This is a schematic diagram of the existing technology showing the fit between the staple cartridge assembly and the staple cartridge protective cover.

[0023] Figure 10 This image shows a comparison of the correct and incorrect methods for replacing the staple cartridge component using existing technology.

[0024] Labeling Explanation: 1. Anchor Seat, 2. Staple Cart Seat, 21. Limiting Structure, 22. Staple Cart, 3. Joint Head, 4. Outer Tube, 5. Clip, 6. Rotary Knob, 7. Manual Retract Button, 8. Main Housing Base, 9. Jaw Release Button, 10. Fixed Handle, 11. Closed Handle, 12. Firing Handle, 13. Cutting Blade, 131. Mating Groove, 14. Push Block, 141. Mating Block, 15. Staple Cart Protective Cover, 151. Limiting Strip. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description:

[0026] like Figures 1 to 9 As shown, a limiting structure for a staple cartridge assembly of a laparoscopic linear cutting stapler is provided. The main body is a linear cutting stapler, which includes a jaw assembly, an outer sleeve 4, and a firing assembly connected sequentially in the front-to-back direction. The jaw assembly includes a staple seat 1 and a staple cartridge seat 2 that are hinged to each other at their rear ends. A staple cartridge 22 is installed inside the staple cartridge seat 2, and the staple cartridge 22 and the staple cartridge seat 2 are fixedly connected by a snap-fit ​​structure.

[0027] The staple cartridge 22 is provided with a push block 14; the outer sleeve 4 is provided with a cutting blade 13, the front end of the cutting blade 13 extends into the staple cartridge 22 and is located on the rear side of the push block 14, and the bottom of the front side of the cutting blade 13 is provided with a mating groove 131; the rear end of the push block 14 is provided with a mating block 141 for supporting the bottom mating groove 131 of the cutting blade 13; the length of the mating groove 131 is L1;

[0028] The staple cartridge seat 2 is provided with two limiting structures 21. The two limiting structures 21 are symmetrically arranged on the left and right sides of the rear part of the staple cartridge seat 2. The rear end of the staple cartridge 22 is limited and matched with the two limiting structures 21. When the staple cartridge 22 is snapped and fixed to the staple cartridge seat 2, the distance between the rear end face of the staple cartridge 22 and the limiting structure 21 is L5, where L5 < L1.

[0029] It should be noted that, during the process of installing the staple cartridge 22 into the staple cartridge seat 2, if the staple cartridge 22 slides backward within the staple cartridge seat 2, this invention allows the rear end of the staple cartridge 22 to abut against the limiting structure 21, so that the maximum backward sliding stroke of the staple cartridge 22 during the adjustment of the buckle structure is L5, and L5 is less than the length L1 of the mating groove 131; this structural design greatly reduces the sliding stroke of the staple cartridge 22, preventing the cutting blade 13 from pushing the pushing block 14 out of the mating groove 131 during the process of installing the staple cartridge 22 into the staple cartridge seat 2.

[0030] Furthermore, the limiting structure 21 consists of protrusions on the left and right side walls inside the nail chamber seat 2, and the front side of the protrusions is a concave arc-shaped surface.

[0031] like Figure 7 As shown, in the prior art, the length of the staple cartridge 22 itself is L2, and the length of the staple cartridge 22 installed in the staple cartridge seat 2 is L3. Actual measurement shows L3-L2=2.7±0.1mm; and the mating groove 131 in front of the cutting blade 13 is as follows... Figure 6As shown, the actual measured length of the mating groove 131 is L1 = 1.27 ± 0.1 mm. Under incorrect installation methods, i.e. without the staple cartridge protective cover, if the user pushes the staple cartridge 22 too far backward during the process of installing it onto the staple cartridge seat 2 and aligning the snap-fit ​​structure, the pushing block 14 inside the staple cartridge 22 will be pushed forward by the relatively fixed cutting blade 13 with a sliding stroke of 2.7 ± 0.1 mm. This sliding stroke is greater than the length L1 of the mating groove. Finally, during surgical use, the mating groove 131 of the cutting blade 13 is not supported by the rear mating block 141 of the pushing block 14. Once the anastomosis is triggered, the cutting blade 13, moved forward by the trigger, will enter the limiting pit at the end of the guide groove, causing the triggering process to be unable to continue and affecting the surgical progress.

[0032] It should be noted that, as Figure 8 As shown, in the improved version of this utility model, the length of the staple cartridge 22 used for installation within the staple cartridge holder 2 with the limiting structure 21 is reduced from L3 to L4, while the length of the staple cartridge 22 itself remains L2. Actual measurements show that L4-L2=0.8±0.1mm<L1. This utility model utilizes the limiting structure 21 to physically block the staple cartridge 22 during installation. This structural design allows the linear stapler of this utility model to ensure correct installation of the staple cartridge 22 without the need for a staple cartridge protective cover. This reduces the learning cost for users of the staple cartridge protective cover's structure and function, and allows surgeons to install the staple cartridge 22 more quickly during surgery, improving surgical efficiency and safety.

[0033] Furthermore, the main body of the firing assembly is the main shell base 8, and the front end of the main shell base 8 is connected to a buckle 5 for connecting with the outer tube 4. The main shell base 8 is provided with a control assembly for controlling the movement or retraction of the cutting blade 13.

[0034] The control components include a closing handle 11, a firing handle 12, a manual return button 7, and a jaw release button 9;

[0035] The closing handle 11 and the firing handle 12 are hinged to the bottom of the main housing base 8, and the manual return button 7 and the jaw release button 9 are located on the surface of the main housing base 8.

[0036] Furthermore, the bottom of the main housing base 8 is also provided with a fixed handle 10, which is located behind the closing handle 11 and the firing handle 12.

[0037] It should be noted that the overall structure of the firing assembly uses conventional technology, so it will not be described in detail.

[0038] Furthermore, the front end of the main housing base 8 is rotatably connected to a rotary knob 6 for rotating the outer sleeve 4, and the front end of the rotary knob 6 is fixedly connected to the buckle 5.

[0039] It should be noted that rotating the knob 6 can drive the entire outer sleeve and jaw assembly to rotate together, thereby adjusting the engagement angle between the nail seat 1 and the nail cartridge seat 2.

[0040] Furthermore, the front end of the outer sleeve 4 is provided with a joint head 3, which is hinged to the pin seat 1 and the pin cartridge seat 2 respectively. The design of the joint head 3 is a conventional technical means, so it will not be described in detail.

[0041] Although this utility model has been illustrated and described using specific embodiments and alternative methods, it should be understood that various changes and modifications are permitted as long as they do not depart from the spirit and scope of this utility model. Therefore, it should be understood that this utility model is not limited in any sense except by the appended claims and their equivalents.

Claims

1. A limiting structure for a staple cartridge assembly of a laparoscopic linear cutting stapler, the main body of which is a linear cutting stapler, the linear cutting stapler including a jaw assembly, an outer sleeve (4) and a firing assembly connected sequentially in the front-back direction; the jaw assembly includes a staple seat (1) and a staple cartridge seat (2) hinged to each other at their rear ends, a staple cartridge (22) is installed inside the staple cartridge seat (2), and the staple cartridge (22) and the staple cartridge seat (2) are fixedly connected by a snap-fit ​​structure; A push block (14) is provided inside the staple cartridge (22); a cutter (13) is provided inside the outer tube (4), the front end of the cutter (13) extends into the staple cartridge (22) and is located on the rear side of the push block (14), and a mating groove (131) is provided at the bottom of the front side of the cutter (13); a mating block (141) for supporting the bottom mating groove (131) of the cutter (13) is provided at the rear end of the push block (14); the length of the mating groove (131) is L1; Its features are: The staple cartridge seat (2) is provided with two limiting structures (21). The two limiting structures (21) are symmetrically located on the left and right sides of the rear part of the staple cartridge seat (2). The rear end of the staple cartridge (22) is limited and matched with the two limiting structures (21). When the staple cartridge (22) is snapped and fixed to the staple cartridge seat (2), the distance between the rear end face of the staple cartridge (22) and the limiting structure (21) is L5, where L5 < L1.

2. The limiting structure of the staple cartridge assembly of a laparoscopic linear cutting stapler according to claim 1, characterized in that: The limiting structure (21) is a protrusion provided on the left and right side walls inside the nail chamber seat (2), and the front side of the protrusion is an arc-shaped surface that is concave to the rear.

3. The limiting structure of the staple cartridge assembly of a laparoscopic linear cutting stapler according to claim 1, characterized in that: The main body of the firing assembly is the main shell base (8), and the front end of the main shell base (8) is connected to a buckle (5) for cooperating with the outer tube (4). The main shell base (8) is provided with a control assembly for controlling the movement or retraction of the cutting blade (13). The control components include a closing handle (11), a firing handle (12), a manual return button (7), and a jaw release button (9). The closing handle (11) and firing handle (12) are hinged to the bottom of the main housing base (8), and the manual return button (7) and jaw release button (9) are located on the surface of the main housing base (8).

4. The limiting structure of the staple cartridge assembly of a laparoscopic linear cutting stapler according to claim 3, characterized in that: The bottom of the main housing base (8) is also provided with a fixed handle (10), which is located behind the closing handle (11) and the firing handle (12).

5. The limiting structure of the staple cartridge assembly of a laparoscopic linear cutting stapler according to claim 3, characterized in that: The front end of the main housing base (8) is rotatably connected to a rotary knob (6) for rotating the outer sleeve (4), and the front end of the rotary knob (6) is fixedly connected to a buckle (5).

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