Anastomosis mechanism of a laparoscopic cutting anastomosis purse string device

Abstract

The application discloses a kind of anastomosis mechanisms of endoscopic cutting anastomosis purse device, it includes upper clamp part and lower clamp part;The proximal end of upper clamp part and lower clamp part is hinged to each other;Cutting knife guide slot extending in the direction of far and near is equipped on the anastomosis surface of upper clamp part or / and lower clamp part;Wherein, upper clamp part and lower clamp part are divided into left and right two parts by cutting knife guide slot, the structure of one part is anastomosis component for realizing anastomosis nail anastomosis, the structure of another part is purse suture component for realizing purse anastomosis;The nail pit of the anastomosis component resistance nail seat is ∞ type nail pit with certain width in middle part.The beneficial effects of the application are that the specific parameters of anastomosis nail nail pit are optimized, it is ensured that anastomosis nail is in completed B type after forming, and the anastomosis effect is improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to an anastomosis mechanism for a laparoscopic cutting and anastomosis purse-string device. Background Technology

[0002] The anastomosis mechanism of the laparoscopic cutting and anastomosis purse-string anastomosis device is a technology disclosed in publication number CN213156149. It is an anastomosis device that achieves anastomosis with staples on one side and purse-string anastomosis on the other side.

[0003] After the product was manufactured, some defects were discovered, specifically:

[0004] Regarding the anastomosis part of the staples, the current rectangular staple pit forming effect has a high defect rate. During the staple forming process, it is not possible to guide the titanium staples well, and dovetail staples and other defective staples often appear after staple forming.

[0005] In the purse-string anastomosis section, after being squeezed by tissue, the purse-string staples are prone to returning to the staple cartridge, causing the staples to lose support and spring back, resulting in an untight purse-string anastomosis.

[0006] In addition, there are some unsatisfactory aspects in some details, such as the distance between the nail holes. Summary of the Invention

[0007] The purpose of this invention is to provide an anastomosis mechanism for a laparoscopic anastomosis purse-string device, which is a localized optimization of the existing anastomosis mechanism of the laparoscopic anastomosis purse-string device, thereby improving the anastomosis effect.

[0008] This invention is achieved through the following technical solution:

[0009] An anastomosis mechanism for a laparoscopic cutting and anastomosis purse-string device includes an upper clamp 1 and a lower clamp 2; the proximal ends of the upper clamp 1 and the lower clamp 2 are hinged to each other; a cutting blade guide groove extending in the proximal direction is provided on the anastomosis surface of the upper clamp 1 and / or the lower clamp 2; wherein the upper clamp 1 and the lower clamp 2 are divided into left and right parts by the cutting blade guide groove, one part of which is an anastomosis component for achieving anastomosis staples, and the other part of which is a purse-string suture component for achieving purse-string anastomosis;

[0010] The nail pit of the anvil in the matching component is an ∞-shaped nail pit with a certain width in the middle.

[0011] Compared with previous technologies, the beneficial effects of the present invention are as follows:

[0012] 1. The specific parameters of the staple pits have been optimized to ensure that the staples form a complete B-shape after molding, thus improving the anastomosis effect.

[0013] 2. Adding an elastic snap-fit ​​structure to the purse-string suture component can prevent the purse-string staples from being squeezed back into the staple cartridge by the tissue after molding, causing the purse-string staples to lose support and spring back, resulting in an untight purse-string opening.

[0014] 3. The distance between the purse-string rivet holes and the anastomosis rivet holes has been optimized to ensure the best anastomosis effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a top view of the nail pit of the staple;

[0017] Figure 3 A cross-sectional view of the central axis of the nail pit of the stapler;

[0018] Figure 4 This is a schematic diagram before the staples are formed;

[0019] Figure 5 This is a schematic diagram of the anastomotic staple after it has been formed;

[0020] Figure 6 This is a cross-sectional view of the matching mechanism;

[0021] Figure 7 for Figure 6 Enlarged view of the seam components of the purse-shaped bag;

[0022] Figure 8 This is a structural diagram of the staple cartridge.

[0023] Figure 9 Side view of the matching mechanism;

[0024] Figure 10 Comparison of conventional staples and staples of the present invention after molding.

[0025] Labeling explanation: 1-Upper clamp, 2-Lower clamp, 3-Anastomosis component, 4-Purple purse-string suture component, 51-Line segment A, 52-Line segment B, 53-Line segment C, 61-Base, 62-Limiting post, 63-Elastic post, 64-Limiting hole, 65-Limiting protrusion. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings:

[0027] like Figure 1-9As shown: An anastomosis mechanism for a laparoscopic cutting and anastomosis purse-string device includes an upper clamp 1 and a lower clamp 2; the proximal ends of the upper clamp 1 and the lower clamp 2 are hinged to each other; a cutting blade guide groove extending in the proximal direction is provided on the anastomosis surface of the upper clamp 1 and / or the lower clamp 2; wherein, the upper clamp 1 and the lower clamp 2 are divided into left and right parts by the cutting blade guide groove, one part of which is an anastomosis component 3 for realizing anastomosis staples, and the other part of which is a purse-string suture component 4 for realizing purse-string anastomosis;

[0028] The specific structure and usage of the anastomosis mechanism of the above-mentioned laparoscopic cutting and anastomosis purse-string device are all existing technologies and have been disclosed in publication number 213156149. Therefore, this invention will not repeat them.

[0029] The nail pit of the anvil in the matching component is an ∞-shaped nail pit with a certain width in the middle.

[0030] Here, the parameters of the ∞-shaped nail hole are optimized to ensure the nail formation effect. The specific parameters to be adjusted are as follows:

[0031] The specific parameters of the ∞-shaped nail pit are as follows:

[0032] The width at its widest point is 0.59 units of length;

[0033] The narrowest point has a width of 0.22 units.

[0034] The overall length is 2.59 units.

[0035] With the transverse central axis of the ∞-shaped nail pit as the cross-sectional line, the bottom contour of the ∞-shaped nail pit satisfies the following conditions:

[0036] Establish a cross coordinate system:

[0037] A first circle is formed with 0.048 as the center and 0.71 as the diameter;

[0038] Two second circles are formed with 0.81, -0.35 and -0.81, -0.35 as centers and 1.6 as diameter;

[0039] Two third circles are formed with 0.845, -1 and -0.845, -1 as centers and 2.9 as diameter;

[0040] The line segment 51 on the third circle, which is the intersection of the X-axis and the third circle, and the intersection of the second circle and the third circle;

[0041] The B segment 52 is taken from the intersection of the second circle and the third circle, and from the intersection of the second circle and the first circle.

[0042] The C-segment 53 is the line segment 53 on the first circle between the intersection of the second circle and the first circle and the intersection of the Y-axis and the first circle;

[0043] Line segments A, B, and C connect to form the bottom outline of the ∞-shaped nail pit.

[0044] Through the above design, due to its arc shape and the characteristic of shrinking in the middle section, the titanium nail can be better guided during the nail forming process, and the final nail is B-shaped.

[0045] The purse-sewing component has an elastic buckle structure on the purse-pin pusher piece. The elastic buckle structure includes a base 61, a limiting post 62, and an elastic post 63. The limiting post and the elastic post are installed on the base. There are two limiting posts, which are respectively located on both sides of the limiting post.

[0046] The outer side of the limiting post is provided with a limiting hole 64; a limiting protrusion 65 that cooperates with the limiting groove is provided at the outlet of the purse nail hole corresponding to the purse nail pusher.

[0047] During the dispensing of the purse-string tack, the elastic locking structure moves forward synchronously. Due to the small size of the purse-string tack hole outlet, the elastic post bends towards the limiting post. After the limiting hole 64 and the limiting protrusion 65 engage, the elastic locking structure cannot retract into the purse-string tack hole, ensuring that the purse-string tack is not squeezed back into the purse-string tack hole by the tissue.

[0048] Along the extension direction of the anvil, the distance between any two adjacent purse-string pin holes is 4.2-4.4 mm; the distance between any two adjacent purse-string pin holes is 3.9-4.1 mm. Let the total length of the purse-string pins be L1, and the total length of the purse-string pins be L2, where a is the distance between two purse-string pin holes and b is the distance between two purse-string pin holes. Various suturing mechanisms with different L1 / L2 specifications can be designed by changing the values ​​of n1 and n2, such as 45mm, 60mm, 75mm, and 90mm suturing mechanisms, all composed of different combinations of n1 and n2. Multiple tests and pressure resistance data show that the combined suturing mechanism exhibits the best pressure resistance / suturing / purse-string effect when a=4mm and b=4.3mm.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anastomosis mechanism for a laparoscopic cutting and anastomosis purse-string device, comprising an upper clamp (1) and a lower clamp (2); the proximal ends of the upper clamp (1) and the lower clamp (2) are hinged to each other; a cutting blade guide groove extending in the proximal direction is provided on the anastomosis surface of the upper clamp (1) and / or the lower clamp (2); wherein, The upper clamp (1) and lower clamp (2) are divided into left and right parts by the cutting blade guide groove. One part is a stapler (3) that realizes staple anastomosis, and the other part is a purse-string suturer (4) that realizes purse-string anastomosis. Its characteristic is that the nail pit of the anvil in the matching member is an ∞-shaped nail pit with a certain width in the middle; The specific parameters of the ∞-shaped nail pit are as follows: The width at its widest point is 0.59 units of length; The narrowest point has a width of 0.22 units. The overall length is 2.59 units. With the transverse central axis of the ∞-shaped nail pit as the cross-sectional line, the bottom contour of the ∞-shaped nail pit satisfies the following conditions: Establish a cross coordinate system: A first circle is formed with (0.0.48) as the center and 0.71 as the diameter; Two second circles are formed with (0.81, -0.35) and (-0.81, -0.35) as centers and 1.6 as diameter; Two third circles are formed with (0.845, -1) and (-0.845, -1) as centers and 2.9 as diameter; The line segment A on the third circle between the intersection of the X-axis and the third circle and the intersection of the second circle and the third circle (51). The B line segment (52) on the second circle between the intersection of the second circle and the third circle and between the intersection of the second circle and the first circle. The C-line segment (53) on the first circle is intercepted between the intersection of the second circle and the first circle and the intersection of the Y-axis and the first circle. Line segments A, B, and C connect to form the bottom outline of the ∞-shaped nail pit.

2. The anastomosis mechanism of the laparoscopic cutting and anastomosis purse-string device according to claim 1, characterized in that: The purse sewing component has an elastic buckle structure on the purse nail pusher, the elastic buckle structure includes a base (61), a limiting post (62) and an elastic post (63); the limiting post and the elastic post are installed on the base, and there are two limiting posts, which are respectively located on both sides of the limiting post. The outer side of the limiting post is provided with a limiting hole (64); a limiting protrusion (65) that cooperates with the limiting groove is provided at the outlet of the purse nail hole corresponding to the purse nail pusher.

3. The anastomosis mechanism of the laparoscopic cutting and anastomosis purse-string device according to claim 1, characterized in that: Along the extending direction of the anvil, the distance between any two adjacent purse pin holes is 4.2-4.4 mm; the distance between any two adjacent matching pin holes is 3.9-4.1 mm.

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