Degradable nested anastomosis device

Abstract

The present invention provides a degradable nested anastomosis device. A radially protruding annular ridge is provided on the outside of the inner cylinder. A lock seat is provided on the outside of the inner cylinder on the rear end side of the annular ridge. A first wall section is formed between the front end and the annular ridge on the outside of the inner cylinder. A second wall section is formed between the annular ridge and the lock seat on the outside of the inner cylinder. The outer sleeve is provided with a base sleeve and elastic claws extending rearward from the base sleeve. A lock head is provided at the rear end of the elastic claws. The front end of the base sleeve is provided with a constriction. Among them, the outer sleeve can be nested on the outside of the inner cylinder from the front end to the rear end at the nested position, so that the constriction is axially pressed against the front end of the inner cylinder. The inside of the base sleeve fits the contour of the first wall section of the inner cylinder, and a cavity is formed between the inside of the elastic claws and the second wall section of the inner cylinder. And the outer sleeve can rotate relative to the inner cylinder at the nested position, so as to lock the outer sleeve and the inner cylinder through the lock head and the lock seat. According to the present invention, the anastomosis sealing performance and anastomosis strength between the two vascular stumps are ensured, and at the same time, no secondary surgery is required for removal.

Description

Technical Field

[0001] The present invention relates to the field of vascular surgical medical devices, and particularly to a degradable nested anastomosis device. Background Art

[0002] During vascular anastomosis, instruments are used to keep the two severed ends of blood vessels in close contact and suture them. Generally, a pair of anastomosis rings are used to respectively hang and closely fit the two severed ends of blood vessels, or a nested stapler is used to clamp the two severed ends of blood vessels between an inner and outer nested set. However, the anastomosis ring instrument has high requirements for suture technology, and it is difficult to be used in minimally invasive surgery or surgical scenarios in narrow spaces. Moreover, it is prone to loosening and damage after being impacted by strong external forces. The nested stapler in the prior art is limited by its structure and cannot provide sufficient anastomosis strength. In addition, the nested stapler in the prior art cannot be degraded in the body, which will cause a foreign body sensation in the patient's body, and it is also impossible to avoid a second operation to remove the stapler, causing secondary harm to the patient's body. Summary of the Invention

[0003] The present invention provides a degradable nested anastomosis device.

[0004] Specifically, the present invention is implemented through the following technical solutions:

[0005] An embodiment of the present invention provides a degradable nested anastomosis device, including an inner cylinder and an outer sleeve. A radially protruding annular ridge is provided on the outside of the inner cylinder. A lock seat is provided on the outside of the inner cylinder on the rear side of the annular ridge. A first wall section is formed between the front end and the annular ridge on the outside of the inner cylinder. A second wall section is formed between the annular ridge and the lock seat on the outside of the inner cylinder. The outer sleeve is provided with a base sleeve and elastic claws extending rearward from the base sleeve. A lock head is provided at the rear end of the elastic claws. The front end of the base sleeve is provided with a constriction. Among them, the constriction of the outer sleeve, the inner wall of the base sleeve, the elastic claws, and the lock head respectively match the front end, the first wall section, the second wall section, and the lock seat of the inner cylinder, so as to be suitable for the outer sleeve to be nested on the outside of the inner cylinder from the front end to the rear end of the inner cylinder in a nested position, so that the constriction abuts against the front end of the inner cylinder axially, the inside of the base sleeve fits the contour of the first wall section of the inner cylinder, and a cavity is formed between the inside of the elastic claws and the second wall section of the inner cylinder. In addition, the outer sleeve can rotate relative to the inner cylinder in the nested position, so as to lock the outer sleeve and the inner cylinder through the lock head and the lock seat.

[0006] In some embodiments, the annular ridge is continuously arranged on the outside of the inner cylinder.

[0007] In some embodiments, the lock seat includes a lock seat body extending circumferentially and a lock seat hook extending rearward from the end of the lock seat body. The lock head includes a lock head body extending circumferentially and a lock head hook extending forward from the end of the lock head body.

[0008] In some embodiments, the elastic claw is configured as a claw root and a claw head, the cavity is formed between the inside of the claw root and the second wall segment, and the inside of the lock head is clamped on the outside of the second wall segment under the action of the elastic restoring force.

[0009] In some embodiments, an arc-shaped transition profile is formed between the first wall segment and the annular ridge.

[0010] In some embodiments, the annular ridge and the second wall segment have an acute-angled transition profile.

[0011] In some embodiments, a clamping structure for clamping a tool is disposed on the outer portion of the inner cylinder and / or the outer cylinder.

[0012] In some embodiments, the inner barrel and / or the outer barrel are made of a magnesium-based alloy.

[0013] In some embodiments, the surface of the inner tube and / or the outer tube is provided with a coating containing RGB peptide or heparin.

[0014] According to the embodiment of the present invention, the blood vessel can be compressed with a large area between the base sleeve and the first wall segment by fitting the contour of the inside of the base sleeve, thereby ensuring the sealing of the anastomosis between the two blood vessel ends; the two blood vessel ends can be locally tightened and fixed by the radially raised annular ridge on the outside of the inner tube, thereby improving the firmness of the blood vessel fixation; the cavity formed between the inside of the elastic claw and the second wall segment of the inner tube can accommodate the wrinkled area of the blood vessel ends, thereby avoiding the loosening of the anastomosis caused by the relative displacement between the blood vessel ends caused by the wrinkle extrusion; by setting the locking seat, the locking head and the closing, the locking head and the locking seat can be locked with each other by rotating the outer sleeve and the inner sleeve, and simultaneously act with the closing to lock the inner sleeve and the outer sleeve in a nested state, and the entire anastomosis operation is simple and quick. At the same time, the nested anastomosis device made of degradable materials can be slowly degraded in the body without the need for secondary surgery to remove it.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] Figure 1 is a schematic diagram of a disassembled state of a degradable nested anastomotic device in one embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the anastomotic state of a degradable nested anastomotic device in one embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of a jacket in one embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the inner cylinder in an embodiment of the present invention;

[0021] Figure 5 is a cross-sectional view of the degradable nested anastomosis device in an embodiment of the present invention;

[0022] Figure 6 is Figure 5 a partial enlarged view of part A in

[0023] Reference numerals:

[0024] 10: inner cylinder; 11: annular ridge; 12: first wall segment; 13: second wall segment; 14: lock seat; 141: lock seat body; 142: lock seat hook; 20: outer sleeve; 21: base sleeve; 211: necking; 22: elastic claw; 221: claw root; 222: claw head; 23: lock head; 231: lock head body; 232: lock head hook; 30: cavity. Detailed implementation manners

[0025] The present invention will now be described with reference to several embodiments. It should be understood that the description of these embodiments is only for enabling those of ordinary skill in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0026] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to"; the terms "embodiment" and "an embodiment" are to be construed as "at least one embodiment"; the term "another embodiment" is to be construed as "at least one other embodiment"; the terms "first", "second", etc. may refer to different or the same objects; the term "arranged" is not limited to direct connection or indirect connection, nor to a specific connection manner. There may also be other explicit and implicit definitions hereinafter.

[0027] In the following description, some specific numerical values or numerical ranges may be involved. It should be understood that these numerical values and numerical ranges are only exemplary and may be helpful for putting the idea of the present invention into practice. However, the description of these examples is not intended to limit the scope of the present invention in any way. According to specific application scenarios and requirements, these numerical values or numerical ranges can be set otherwise.

[0028] As described above, due to structural limitations, the nested stapler in the prior art cannot provide higher anastomosis strength for degradable stapler products. The degradable nested anastomosis device proposed by the embodiments of the present invention at least partially solves the above problems. The following will refer to Figures 1 to 6 to describe the structure and working principle of the degradable nested anastomosis device according to the exemplary embodiments of the present invention. As Figures 1 to 6As shown in the figure, the degradable nested anastomosis device of the embodiment of the present invention is composed of an inner cylinder 10 and an outer sleeve 20 nested with each other. At least one of the outer parts of the inner cylinder 10 and the outer sleeve 20 can be provided with a clamping structure for tool clamping operation. That is to say, the degradable nested anastomosis device of the embodiment of the present invention can also include a tool.

[0029] To clearly describe the structure and working principle of the degradable nested anastomosis device of the embodiment of the present invention, as Figure 5 shown, the end where the mouth 211 of the outer sleeve 20 is located and the end where the first wall section 12 of the inner cylinder 10 is located are defined as the "front end", and the other end in the direction opposite to the "front end" is defined as the "rear end".

[0030] The inner cylinder 10 is generally cylindrical in shape, and the inside is hollow for a blood vessel to pass through the hollow. The outer contour of the inner cylinder 10 is formed with a first wall section 12, a circumferential ridge 11 and a second wall section 13. The positions of the first wall section 12, the circumferential ridge 11 and the second wall section 13 are arranged in sequence from the front end to the rear end. There is a transition between the first wall section 12 and the circumferential ridge 11, and there is a transition between the circumferential ridge 11 and the second wall section 13.

[0031] The circumferential ridge 11 protrudes radially from the outside of the inner cylinder 10. The protruding part has a larger radial dimension and a larger local pressure, so that the blood vessel can be firmly tightened at the circumferential ridge 11 to ensure that there is no displacement between the blood vessel and the inner cylinder 10. In one embodiment, as Figures 1 to 4 shown, the circumferential ridge 11 extends continuously along the circumferential direction of the inner cylinder 10, so that the circumferential ridge 11 can provide a tightening effect on the blood vessel at each position within a 360-degree range. In another embodiment, the circumferential ridge 11 can be arranged to extend intermittently along the circumferential direction of the inner cylinder 10.

[0032] The circumferential ridge 11 is transitionally connected to the first wall section 12 on the front end side. In one embodiment, the transitional connection contour between the circumferential ridge 11 and the first wall section 12 is arc-shaped. As Figure 5 and Figure 6 shown, the arc can be a concave arc, so that during the process of pushing the outer sleeve 20 from the front end to the outside of the inner cylinder 10, the claw head 222 of the elastic claw 22 can be guided by the arc-shaped transitional contour and thus be smoothly expanded and passed over the circumferential ridge 11.

[0033] The circumferential ridge 11 is transitionally connected to the second wall section 13 on the rear end side. In one embodiment, the transitional connection contour between the circumferential ridge 11 and the second wall section 13 is acutely inclined. As Figure 5 and Figure 6 shown, the acute inclination means that the included angle between the wall of the circumferential ridge 11 near the rear end and the second wall section 13 is less than 90 degrees, so that the blood vessel wall can be attached to the acutely inclined wall towards the front end. That is to say, it can ensure that the blood vessel wall is more firmly hooked at the circumferential ridge 11.

[0034] The outer sleeve 20 generally includes an annular base sleeve 21 and elastic claws 22. The elastic claws 22 extend from the base sleeve 21 towards the rear end. Exemplarily, the number of elastic claws 22 can be 2, 3, 4 or more. A reduced-diameter necking 211 is formed at the front end of the outer sleeve 20. The necking 211 can be tightly abutted against the front end of the inner cylinder 10, thereby preventing the front end of the inner cylinder 10 from passing through the necking 211 of the outer sleeve 20.

[0035] The interior of the base sleeve 21 is configured to conform to the contour of the first wall segment 12 of the inner cylinder 10. When the blood vessel wall is clamped between the base sleeve 21 and the first wall segment 12, the compression area between the blood vessel wall, the interior of the base sleeve 21, and the first wall segment 12 is greatly increased, thereby improving the sealing performance of the anastomosis surface of the two blood vessel stumps.

[0036] The elastic claws 22 are configured as a cantilever structure, so they have elasticity and can be radially expanded outward by the annular ridge 11 and are clamped tightly against the second wall segment 13 by the elastic restoring force. In one embodiment, the elastic claws 22 are configured as a claw root 221 and a claw head 222. The claw root 221 is connected to the base sleeve 21. The interior of the claw root 221 is formed as an arch extending radially outward. A cavity 30 is formed between the arch and the second wall segment 13 of the inner cylinder 10, enabling a larger-sized blood vessel wall fold to be accommodated at the cavity 30. If there is no space to accommodate the fold, the squeezing force inside the fold will be transmitted to the blood vessel wall in the surrounding area, thereby causing relative displacement of the blood vessel wall relative to the inner cylinder 10 and the outer sleeve 20.

[0037] A lock seat 14 is provided at a position on the outside of the inner cylinder 10 near the rear end of the second wall segment 13. A lock head 23 is provided on the claw head 222 of the outer sleeve 20. When the outer sleeve 20 and the inner cylinder 10 rotate relative to each other, the lock head 23 can cooperate with the lock seat 14 to lock the inner cylinder 10 and the outer sleeve 20 in the nested position.

[0038] In one embodiment, the lock seat 14 includes a lock seat body 141 extending circumferentially and a lock seat hook 142 extending from the end of the lock seat body 141 towards the rear end. The lock head 23 includes a lock head body 231 extending circumferentially and a lock head hook 232 extending from the end of the lock head body 231 towards the front end. After the inner cylinder 10 and the outer sleeve 20 rotate relative to each other, the lock head hook 232 and the lock seat hook 142 are used to provide a locking function for the relative circumferential movement of the inner cylinder 10 and the outer sleeve 20, and the cooperation between the lock head hook 232 and the lock seat body 141, and between the lock seat hook 142 and the lock head body 231 is used to provide a locking function for the relative axial movement of the inner cylinder 10 and the outer sleeve 20.

[0039] In one embodiment, the inner tube 10 and the outer sleeve 20 are made of a magnesium-based alloy, so that the anastomosis device is gradually degraded in the body. Exemplarily, the magnesium-based alloy is Mg-1Zn-0.5Mn (wt%), and the degradation rate can reach 0.5-1.0 mm / year. As the inner tube 10 and the outer sleeve 20 are gradually degraded in the body, the first wall segment 12 and the base sleeve 21 can still maintain a sufficiently large fitting area to ensure the sealing between the anastomotic blood vessels. At the same time, the annular ridge 11 can still maintain a sufficiently large tightening force on the blood vessels to ensure the firmness between the blood vessels and the anastomosis device, and the mechanical locking structure has a large wall thickness to ensure that the locking function does not fail.

[0040] In one embodiment, the surfaces of the inner tube 10 and the outer tube 20 are provided with a coating containing RGB peptide or heparin, which can promote endothelial cell adhesion and inhibit thrombosis through surface modification.

[0041] When using the degradable nested anastomosis device of the embodiment of the present invention, one broken end of the blood vessel is passed through the hollow of the inner tube 10 from the rear end and hooked on the annular ridge 11 from the front end, and the other broken end of the blood vessel is passed through the outer sleeve 20 from the front end to the rear end and hooked on the annular ridge 11. At this time, the two broken ends of the blood vessels are hooked on the annular ridge 11 at the same time. After that, the outer sleeve 20 is pushed from the front end to the outside of the inner tube 10 and continues to be pushed to the rear end, the claw head 222 passes over the annular ridge 11 and clamps the blood vessel at the position of the second wall section 13 until the closing 211 is pressed against the front end of the inner tube 10, and the outer sleeve 20 is rotated to lock the lock seat 14 and the lock head 23 with each other, completing the blood vessel anastomosis operation. The entire operation process is convenient and efficient.

[0042] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A degradable nested anastomosis device, characterized in that, Comprising an inner cylinder and an outer sleeve, the outer part of the inner cylinder is provided with a radially protruding annular ridge. A lock seat is arranged on the outer part of the inner cylinder on the rear end side of the annular ridge. A first wall section is formed between the front end and the annular ridge on the outer part of the inner cylinder. A second wall section is formed between the annular ridge and the lock seat on the outer part of the inner cylinder. The outer sleeve is provided with a base sleeve and elastic claws extending rearward from the base sleeve. A lock head is arranged at the rear end of the elastic claws. The front end of the base sleeve is provided with a constriction. Among them, the constriction of the outer sleeve, the inner wall of the base sleeve, the elastic claws, and the lock head respectively match with the front end, the first wall section, the second wall section, and the lock seat of the inner cylinder, so as to be suitable for the outer sleeve to be nested on the outer part of the inner cylinder from the front end to the rear end of the inner cylinder at the nested position, so that the constriction is axially pressed against the front end of the inner cylinder. The inside of the base sleeve fits the contour of the first wall section of the inner cylinder. When the blood vessel wall is clamped by the base sleeve and the first wall section, a pressing area is formed between the blood vessel wall and the inside of the base sleeve and the first wall section. And a cavity is formed between the inside of the elastic claws and the second wall section of the inner cylinder, so that the cavity can accommodate the blood vessel wall folds. And the outer sleeve can rotate relative to the inner cylinder at the nested position, so as to lock the outer sleeve and the inner cylinder through the lock head and the lock seat; Among them, an arc-shaped transition contour is formed between the first wall section and the annular ridge, and an acute-angle inclined transition contour is formed between the annular ridge and the second wall section.

2. The degradable nested anastomosis device according to claim 1, wherein The annular ridge is continuously extended and arranged on the outer part of the inner cylinder.

3. The degradable nested anastomosis device according to claim 1, wherein, The lock seat includes a lock seat body extending circumferentially and a lock seat hook extending rearward from the end of the lock seat body. The lock head includes a lock head body extending circumferentially and a lock head hook extending forward from the end of the lock head body.

4. The degradable nested anastomosis device according to claim 1, wherein The elastic claws are arranged as a claw root and a claw head. A cavity is formed between the inside of the claw root and the second wall section. The inside of the lock head is clamped outside the second wall section under the action of elastic restoring force.

5. The degradable nested anastomosis device according to claim 1, characterized in that, A clamping structure for tool clamping is arranged on the outer part of the inner cylinder and / or the outer sleeve.

6. The degradable nested anastomosis device according to claim 1, wherein The inner cylinder and / or the outer sleeve is made of a magnesium-based alloy.

7. The degradable nested anastomosis device according to claim 1, wherein, A coating containing RGB peptide or heparin is arranged on the surface of the inner cylinder and / or the outer sleeve.

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