Degradable nested anastomosis device

Abstract

The degradable nested anastomosis device is characterized in that an annular ridge protruding in the radial direction is arranged on the outer portion of an inner cylinder, a lock seat is arranged on the portion, close to the rear end side of the annular ridge, of the outer portion of the inner cylinder, a first wall section is formed between the front end of the outer portion of the inner cylinder and the annular ridge, and a second wall section is formed between the annular ridge and the lock seat; the outer sleeve is provided with a base sleeve and an elastic claw extending from the base sleeve to the rear end, a lock head is arranged at the rear end of the elastic claw, a closing opening is formed in the front end of the base sleeve, and the outer sleeve can be nested in a nesting position outside the inner barrel from the front end of the inner barrel to the rear end, so that the closing opening abuts against the front end of the inner barrel in the axial direction, and the interior of the base sleeve is attached to the outline of the first wall section of the inner barrel; a cavity is formed between the interior of the elastic claw and the second wall section of the inner cylinder, and the outer sleeve can rotate relative to the inner cylinder at the nesting position, so that the outer sleeve and the inner cylinder are locked through the lock head and the lock seat. According to the invention, the anastomosis sealing performance and the anastomosis strength between the broken ends of the two blood vessels are ensured, and secondary operation for taking out is not needed.

Description

Technical Field

[0001] The invention relates to the field of vascular surgical medical instruments, and in particular to a degradable nested anastomotic device. Background Art

[0002] During vascular anastomosis, instruments are used to keep the two blood vessel ends in close contact and suture. The anastomotic instrument generally uses a pair of anastomotic rings to hang the two blood vessel ends separately and then fit them tightly, or uses a nested anastomotic device to clamp the two blood vessel ends between the inner and outer nested parts. However, the anastomotic ring instrument has high requirements for suturing technology, and is difficult to use in minimally invasive surgery or confined space surgery scenarios, and is prone to loosening and damage after being hit by strong external forces. The nested anastomotic devices in the prior art are limited by their structure and cannot provide sufficient anastomotic strength. In addition, the nested anastomotic devices in the prior art cannot be degraded in the body, which will cause a foreign body sensation in the patient's body. It is also impossible to avoid a second operation to remove the anastomotic device, causing secondary damage to the patient's body. Summary of the invention

[0003] The invention provides a degradable nested anastomotic device.

[0004] Specifically, the present invention is achieved through the following technical solutions: The embodiment of the present invention provides a degradable nested anastomosis device, comprising an inner tube and an outer tube, wherein a radially protruding annular ridge is arranged on the outside of the inner tube, a locking seat is arranged on the rear end side of the annular ridge on the outside of the inner tube, a first wall segment is formed on the outside of the inner tube between the front end and the annular ridge, and a second wall segment is formed on the outside of the inner tube between the annular ridge and the locking seat, the outer tube is provided with a base sleeve and an elastic claw extending from the base sleeve to the rear end, a locking head is arranged at the rear end of the elastic claw, and a closing is arranged at the front end of the base sleeve, wherein the closing, the inner wall of the base sleeve, the elastic claw, and the locking head of the outer tube are matched with the front end, the first wall segment, the second wall segment, and the locking seat of the inner tube respectively, so that the outer tube can be nested in the nesting position of the outer tube from the front end to the rear end of the inner tube, so that the closing is tightly pressed against the front end of the inner tube along the axial direction, the inside of the base sleeve is in line with the contour of the first wall segment of the inner tube, and a cavity is formed between the inside of the elastic claw and the second wall segment of the inner tube, and the outer tube can rotate relative to the inner tube at the nesting position, so that the outer tube and the inner tube are locked by the locking head and the locking seat.

[0005] In some embodiments, the annular ridge is provided along a continuous extension on the exterior of the inner barrel.

[0006] In some embodiments, the lock seat includes a lock seat body extending circumferentially and a lock seat hook extending from the end of the lock seat body to the rear end, and the lock head includes a lock head body extending circumferentially and a lock head hook extending from the end of the lock head body to the front end.

[0007] 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.

[0008] In some embodiments, an arc-shaped transition profile is formed between the first wall segment and the annular ridge.

[0009] In some embodiments, the annular ridge and the second wall segment have an acute-angled transition profile.

[0010] 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.

[0011] In some embodiments, the inner barrel and / or the outer barrel are made of a magnesium-based alloy.

[0012] In some embodiments, the surface of the inner tube and / or the outer tube is provided with a coating containing RGB peptide or heparin.

[0013] 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.

[0014] 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 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. Figure 1 is a schematic diagram of a disassembled state of a degradable nested anastomotic device in one embodiment of the present invention; Figure 2 is a schematic diagram of the anastomotic state of a degradable nested anastomotic device in one embodiment of the present invention; Figure 3 is a schematic diagram of a jacket in one embodiment of the present invention; Figure 4 is a schematic diagram of an inner cylinder in one embodiment of the present invention; Figure 5 is a cross-sectional view of a degradable nested anastomotic device in one embodiment of the present invention; Figure 6 yes Figure 5 A partial enlarged view of point A in the middle.

[0015] Reference numerals: 10: inner tube; 11: annular ridge; 12: first wall section; 13: second wall section; 14: lock seat; 141: lock seat body; 142: lock seat hook; 20: outer sleeve; 21: base sleeve; 211: closing; 22: elastic claw; 221: claw root; 222: claw head; 23: lock head; 231: lock head body; 232: lock head hook; 30: cavity. DETAILED DESCRIPTION

[0016] The present invention will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0017] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to"; the terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment"; the term "another embodiment" is to be interpreted as "at least one other embodiment"; the terms "first", "second", etc. may refer to different or the same objects; the term "setting" is not limited to direct connection or indirect connection, nor is it limited to a specific connection method. Other explicit and implicit definitions may also be included below.

[0018] 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 merely exemplary, and they may be helpful in 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 separately.

[0019] As mentioned above, the nested stapler of the prior art is limited by its structure and cannot provide higher anastomosis strength on the degradable stapler product. The degradable nested stapler proposed in the embodiment of the present invention at least partially solves the above problem. Figures 1 to 6 The structure and working principle of the degradable nested anastomotic device according to an exemplary embodiment of the present invention are described below. Figures 1 to 6 As shown, the degradable nested anastomosis device of the embodiment of the present invention is composed of an inner tube 10 and an outer tube 20 nested with each other. A clamping structure may also be provided on the outside of at least one of the inner tube 10 and the outer tube 20 for tool clamping operation. That is to say, the degradable nested anastomosis device of the embodiment of the present invention may also include tools.

[0020] To clearly describe the structure and working principle of the degradable nested anastomotic device according to the embodiment of the present invention, Figure 5 As shown, one end where the closing opening 211 of the outer sleeve 20 is located and one end where the first wall section 12 of the inner tube 10 is located are defined as the "front end", and the other end opposite to the "front end" is defined as the "rear end".

[0021] The inner tube 10 is cylindrical in shape as a whole, and is hollow inside so that a blood vessel can pass through the hollow. The outer contour of the inner tube 10 is formed with a first wall section 12, an annular ridge 11, and a second wall section 13, which are arranged in sequence from the front end to the rear end, with a transition between the first wall section 12 and the annular ridge 11, and a transition between the annular ridge 11 and the second wall section 13.

[0022] The annular ridge 11 protrudes radially from the outside of the inner tube 10, and the protrusion has a larger radial dimension and a larger local pressure, so that the blood vessel can be firmly supported at the annular ridge 11 to ensure that there is no displacement between the blood vessel and the inner tube 10. In one embodiment, Figures 1 to 4 As shown, the annular ridge 11 extends continuously along the circumference of the inner tube 10, so that the annular ridge 11 can provide a tightening effect on the blood vessel at every position within a 360-degree range. In another embodiment, the annular ridge 11 can be arranged to extend intermittently along the circumference of the inner tube 10.

[0023] The annular ridge 11 is transitionally connected to the first wall segment 12 at the front end side. In one embodiment, the transitional connection profile between the annular ridge 11 and the first wall segment 12 is arc-shaped, such as Figure 5 and Figure 6 As shown, the arc can be a concave arc, so that when the outer sleeve 20 is pushed from the front end to the outside of the inner tube 10, the claw head 222 of the elastic claw 22 can be guided by the arc transition profile and thus smoothly stretched over the annular ridge 11.

[0024] The annular ridge 11 is transitionally connected to the second wall segment 13 at the rear end side. In one embodiment, the transitional connection profile between the annular ridge 11 and the second wall segment 13 is inclined at an acute angle, such as Figure 5 and Figure 6 As shown, the acute angle inclination means that the angle between the wall at the rear end of the annular ridge 11 and the second wall segment 13 is less than 90 degrees, so that the blood vessel wall can fit on the acute angle inclined wall toward the front end, that is, it can ensure that the blood vessel wall is hooked more firmly at the annular ridge 11.

[0025] The outer sleeve 20 as a whole comprises an annular base sleeve 21 and elastic claws 22, the elastic claws 22 extending from the base sleeve 21 toward the rear end, and illustratively, the number of the elastic claws 22 may be 2, 3, 4 or more. The front end of the outer sleeve 20 is formed with a radially reduced closing opening 211, which can be tightly pressed against the front end of the inner cylinder 10, thereby preventing the front end of the inner cylinder 10 from passing through the closing opening 211 of the outer sleeve 20.

[0026] The interior of the base sleeve 21 is configured to fit the contour of the first wall segment 12 of the inner tube 10. When the blood vessel wall is clamped by the base sleeve 21 and the first wall segment 12, the compression area between the blood vessel wall and the interior of the base sleeve 21 and the first wall segment 12 is greatly increased, thereby improving the sealing of the anastomotic surfaces of the two blood vessel ends.

[0027] The elastic claw 22 is configured as a cantilever structure, so it is elastic and can be stretched radially outward by the annular ridge 11, and squeezed tightly with the second wall segment 13 by elastic restoring force. In one embodiment, the elastic claw 22 is configured as a claw root 221 and a claw head 222, the claw root 221 is connected to the base sleeve 21, and the inside of the claw root 221 is formed into an arch radially outward, and a cavity 30 is formed between the arch and the second wall segment 13 of the inner tube 10, so that the cavity 30 can accommodate larger vascular wall wrinkles. If there is no space to accommodate the wrinkles, the squeezing force inside the wrinkles will be transmitted to the vascular wall in the surrounding area, thereby causing the vascular wall to be relatively displaced relative to the inner tube 10 and the outer sleeve 20.

[0028] A lock seat 14 is provided on the outside of the inner cylinder 10 near the rear end of the second wall section 13, and a lock head 23 is provided on the claw head 222 of the outer sleeve 20, so that the outer sleeve 20 and the inner cylinder 10 can rotate relative to each other. The lock head 23 can cooperate with the lock seat 14, thereby locking the inner cylinder 10 and the outer sleeve 20 in the nested position.

[0029] In one embodiment, the lock base 14 includes a lock base body 141 extending in the circumferential direction and a lock base hook 142 extending from the end of the lock base body 141 to the rear end, and the lock head 23 includes a lock head body 231 extending in the circumferential direction and a lock head hook 232 extending from the end of the lock head body 231 to the front end. When the inner cylinder 10 and the outer shell 20 rotate relative to each other, the lock head hook 232 and the lock base hook 142 are used to provide a locking effect of the inner cylinder 10 and the outer shell 20 moving relative to each other in the circumferential direction, and the lock head hook 232 cooperates with the lock base body 141, and the lock base hook 142 and the lock body 231 to provide a locking effect of the inner cylinder 10 and the outer shell 20 moving relative to each other in the axial direction.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 anastomotic device, characterized in that: The lock assembly comprises an inner tube and an outer tube, the outer tube is provided with a radially raised annular ridge on the outside of the inner tube, a locking seat is provided on the outer tube at the rear end side of the annular ridge, a first wall section is formed on the outer tube between the front end and the annular ridge, and a second wall section is formed on the outer tube between the annular ridge and the locking seat, the outer tube is provided with a base sleeve and an elastic claw extending from the base sleeve to the rear end, a locking head is provided at the rear end of the elastic claw, and a closing is provided at the front end of the base sleeve, wherein the closing, the inner wall of the base sleeve, the elastic claw and the locking head are respectively matched with the front end, the first wall section, the second wall section and the locking seat of the inner tube, so that the outer tube can be nested in the nesting position of the outer tube from the front end to the rear end of the inner tube, so that the closing is axially pressed against the front end of the inner tube, the inside of the base sleeve is fitted with the contour of the first wall section of the inner tube, and a cavity is formed between the inside of the elastic claw and the second wall section of the inner tube, and the outer tube can rotate relative to the inner tube at the nesting position, so that the outer tube and the inner tube are locked by the locking head and the locking seat.

2. The degradable nested anastomotic device according to claim 1, characterized in that: The annular ridge is arranged along a continuous extension on the outside of the inner cylinder.

3. The degradable nested anastomotic device according to claim 1, characterized in that: The lock seat comprises a lock seat body extending in the circumferential direction and a lock seat hook extending from the end of the lock seat body to the rear end, and the lock head comprises a lock head body extending in the circumferential direction and a lock head hook extending from the end of the lock head body to the front end.

4. The degradable nested anastomotic device according to claim 1, characterized in that: 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.

5. The degradable nested anastomotic device according to claim 1, characterized in that: An arc-shaped transition profile is formed between the first wall segment and the annular ridge.

6. The degradable nested anastomotic device according to claim 1, characterized in that: There is an acute-angled transition profile between the annular ridge and the second wall segment.

7. The degradable nested anastomotic device according to claim 1, characterized in that: A clamping structure for clamping a tool is arranged outside the inner cylinder and / or the outer sleeve.

8. The degradable nested anastomotic device according to claim 1, characterized in that: The inner cylinder and / or the outer cylinder are made of a magnesium-based alloy.

9. The degradable nested anastomotic device according to claim 1, characterized in that: The surface of the inner tube and / or the outer tube is provided with a coating containing RGB peptide or heparin.

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