Seminiferous duct anastomosis stent

Abstract

The utility model discloses a seminiferous duct anastomosis stent which comprises a pipe frame, a first anti-falling structure and a second anti-falling structure, and a plurality of hollow holes are formed in the pipe frame. The first anti-falling structure and the second anti-falling structure are arranged at the two ends of the pipe frame respectively, and the anti-falling directions of the first anti-falling structure and the second anti-falling structure are opposite. The seminiferous duct anastomosis stent can effectively reduce the operation time, simplify the operation process, reduce the operation difficulty and improve the anastomosis success rate; the disc type anti-falling structure can reduce damage to the pipe wall and mucous membrane of the seminiferous duct, improve the connection firmness with the seminiferous duct and reduce the pressure acting on the pipe wall. The hollow holes can further enhance the connecting effect of the pipe frame and the seminiferous duct while reducing consumables, and particularly for a degradable stent, the hollow holes can enable liquid in the seminiferous duct to be uniformly dispersed everywhere, so that the stent is promoted to be uniformly absorbed, the possibility of secondary obstruction caused by non-uniform degradation is avoided, and the service life of the stent is prolonged. Meanwhile, the inflammatory reaction caused by contact with mucosa is reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a vas deferens anastomosis stent. Background Art

[0002] Vas deferens anastomosis is a common surgical method for reopening the vas deferens after obstruction. This surgery requires experienced senior doctors to perform surgical operations under a microscope using 8-0, 9-0, and 10-0 microsutures. The average duration is about 3-4 hours. It has disadvantages such as high difficulty, high requirements, long cycle, and limited anastomosis success rate. At the same time, it poses a great test to the physical fitness and mental state of the surgeons.

[0003] Currently, although there are related vas deferens anastomosis stents, their designs have certain damages. Specifically, the barbs for preventing detachment are extremely likely to damage the vas deferens mucosa and the vas deferens wall. This kind of damage is irreversible and may even lead to hemospermia, scrotal hematoma, and sperm granuloma, resulting in the failure of vas deferens anastomosis. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a vas deferens anastomosis stent, which is used to simplify the surgical process, reduce the surgical difficulty, and at the same time reduce the damage to the vas deferens during the operation and improve the anastomosis success rate.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A vas deferens anastomosis stent, comprising:

[0007] A tube frame, on which a plurality of hollow holes are provided;

[0008] First and second anti-detachment structures, which are respectively arranged at both ends of the tube frame and have opposite anti-detachment directions.

[0009] In some embodiments, both the first and second anti-detachment structures are elastic disc members.

[0010] In some embodiments, the number of the first anti-detachment structures is multiple and they are spaced apart along a first direction; the number of the second anti-detachment structures is multiple and they are spaced apart along a second direction.

[0011] In some embodiments, the protruding height of the disc member is 0.12 mm - 0.18 mm, and the included angle between the inner side surface of the disc member and the outer peripheral surface of the tube frame is 30° - 60°.

[0012] In some embodiments, the hollow holes are circumferentially spaced between adjacent disc members.

[0013] In some embodiments, an indicating strip is provided in the middle of the tube frame, and the first and second anti-detachment structures are symmetric about the indicating strip.

[0014] In some embodiments, the diameter of the tube holder is not less than 1 mm and the length is not less than 5 mm; the total lengths L1 and L2 of the first and second anti - detachment structures are not less than 2 mm respectively.

[0015] In some embodiments, the tube holder and the first and second anti - detachment structures are integrally formed of a biodegradable material.

[0016] In some embodiments, the wall thickness of the tube holder gradually decreases from the middle to both sides.

[0017] In some embodiments, a structural layer is provided on the surface of the vas deferens anastomosis stent, and the structural layer is a convex pattern or a groove.

[0018] In some embodiments, a drug layer is provided on the surface of the vas deferens anastomosis stent, and the drug layer contains at least one of bacteriostatic, analgesic, and healing - promoting agents.

[0019] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0020] 1. It can effectively reduce the operation time, simplify the operation process, reduce the operation difficulty, and improve the anastomosis success rate.

[0021] 2. The disc - type anti - detachment structure can reduce the damage to the vas deferens wall and mucosa, improve the connection firmness with the vas deferens, and reduce the pressure acting on the wall.

[0022] 3. While reducing the consumables, the hollow holes can further enhance the connection effect between the tube holder and the vas deferens. Especially for the biodegradable stent, the hollow holes can make the liquid in the vas deferens evenly disperse everywhere, promote the uniform absorption of the stent, avoid the possibility of secondary obstruction caused by uneven degradation, and at the same time reduce the inflammatory reaction caused by the contact with the mucosa.

[0023] 4. The indicator band is convenient for the surgeon to judge the implantation depth of the stent, ensure the same traction force on both sides, and reduce the risk of disconnection at the anastomosis.

[0024] 5. The biodegradable biomaterial gradually degrades and is absorbed after anastomosis, without affecting any function of the vas deferens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the vas deferens anastomosis stent of the present utility model.

[0026] Figure 2 is a cross - sectional view of the vas deferens anastomosis stent of the present utility model.

[0027] Figure 3 is an application schematic diagram of the vas deferens anastomosis stent of the present utility model.

[0028] Figure 4 It is a schematic diagram of a vas deferens anastomosis stent with a structural layer on its surface.

[0029] Figure 5 It is a schematic diagram of a vas deferens anastomosis stent with a drug layer on its surface.

[0030] In the figure: 1, tube support; 2, first anti-detachment structure; 3, second anti-detachment structure; 4, hollow hole; 5, indicating strip; 6, structural layer; 7, drug layer; 8, vas deferens. Specific embodiments

[0031] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be more complete and comprehensive, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repeated description will be omitted.

[0032] In this utility model, the words describing the position and direction are illustrated by taking the accompanying drawings as examples, but can be changed according to needs, and all changes made are included within the protection scope of this utility model.

[0033] This utility model discloses a vas deferens anastomosis stent, which is mainly used for vas deferens 8 anastomosis surgery. On the premise of meeting the requirements, it can also be used for some intestinal, vascular, tracheal and other surgeries, and no limitations are made here.

[0034] See Figure 1 and Figure 2 As shown, the vas deferens anastomosis stent includes a tube support 1 and first and second anti-detachment structures 2 and 3.

[0035] Among them, the tube support 1 is in the shape of a circular tube, and its outer diameter is slightly larger than the inner diameter of the vas deferens 8, so as to support the mucosa and muscular layer of the vas deferens 8, making the vas deferens 8 closely fit with the tube support 1. The first and second anti-detachment structures 2 and 3 are respectively arranged at both ends of the tube support 1, and their anti-detachment directions are opposite, so that the vas deferens 8 at both ends are effectively fixed after being sleeved on the tube support 1, thus facilitating subsequent anastomosis surgery operations.

[0036] In this application, the first and second anti-detachment structures 2 and 3 are both disc-shaped parts with certain elasticity. The disc-shaped parts are arranged at an acute angle on the outer periphery of the tube support 1 along the insertion direction. The disc-shaped parts are continuous and smooth in the circumferential direction, which causes very little damage to the vas deferens 8. Compared with the existing barbed anti-detachment design, the damage is almost negligible, and it can effectively avoid problems such as hemospermia, scrotal hematoma, sperm granuloma, etc. caused by damaging the vas deferens 8 wall and mucosa, and reduce the possibility of postoperative complications.

[0037] Moreover, a relatively large conical space is formed between the inner side surface of the disc member and the outer peripheral surface of the pipe support 1. This space will be filled by the pipe wall and mucosa of the vas deferens 8 after the pipe support 1 is implanted into the vas deferens 8. Compared with the existing barbed anti-displacement design, the contact area with the vas deferens 8 is larger and the connection is more secure. At the same time, the pressure distributed on the unit area of the vas deferens 8 is also smaller, which makes the pipe wall and mucosa of the vas deferens 8 not easily torn or cut, and the reliability is better.

[0038] In addition, a number of hollow holes 4 are provided on the pipe support 1. This design, on the one hand, reduces the consumption of materials of the pipe support 1, making the manufacturing cost of the vas deferens anastomosis stent lower. On the other hand, part of the vas deferens 8 may be embedded in the hollow holes 4, further increasing the connection strength with the pipe support 1.

[0039] In particular, for the degradable vas deferens anastomosis stent, the existence of the hollow holes 4 enables the liquid (a part of semen) in the vas deferens 8 to diffuse to all parts of the stent, that is, both the inner and outer sides of the pipe support 1 and the first and second anti-displacement structures 2 and 3 can be in full contact with the liquid, thereby promoting its accelerated decomposition and absorption, avoiding the possibility of secondary obstruction caused by uneven degradation due to liquid isolation on the outer side of the pipe support 1, and at the same time reducing the inflammatory reaction caused by the contact with the mucosa.

[0040] See Figure 3 As shown, when the above vas deferens anastomosis stent is used, one end of the pipe support 1 is placed in one section of the vas deferens 8, and the other end of the pipe support 1 is placed in another section of the vas deferens 8. After the sleeving is completed, the two ends of the vas deferens 8 will not displace under the restriction of the first and second anti-displacement structures 2 and 3 respectively. After that, only the outermost layer of the vas deferens 8 needs to be simply fixed to complete the anastomosis operation. Using this stent to assist the surgical operation can help the surgeon quickly anastomose, reduce the operation time, simplify the surgical procedure, lower the surgical difficulty, and improve the anastomosis success rate.

[0041] Still as Figure 1 and 2 As shown, in some embodiments, the number of the first anti-displacement structures 2 is multiple, and they are spaced apart along the first direction, for example, the left direction, so as to improve the connection effect between the first anti-displacement structure 2 and the vas deferens 8. Correspondingly, the number of the second anti-displacement structures 3 is multiple, and they are spaced apart along the second direction, for example, the right direction, so as to improve the connection effect between the second anti-displacement structure 3 and the vas deferens 8.

[0042] In some embodiments, the protruding height of the disc is 0.2mm-0.3mm, and the angle between the inner side of the disc and the outer peripheral surface of the tube rack 1 is 30°-60°. If the height of the disc is less than 0.2mm and the angle is less than 30°, its anti-slip effect decreases, affecting the firmness of the connection with the vas deferens 8; if the height of the disc is higher than 0.3mm and the angle is greater than 60°, it may form a bulge after being implanted in the vas deferens 8, affecting the comfort after surgery. When the disc is within the above-mentioned limited range, it can be guaranteed to have a good anti-slip and connection effect, and reduce postoperative discomfort. Preferably, in this application, the protruding height of the disc is 0.24mm-0.26mm, and the angle between the inner side of the disc and the outer peripheral surface of the tube rack 1 is 35°-50°. More preferably, the protruding height of the disc is 0.25mm, and the angle between the inner side of the disc and the outer peripheral surface of the tube rack 1 is 40°-45°.

[0043] In some embodiments, the hollow holes 4 are arranged at intervals between adjacent discs in the circumferential direction to improve the uniformity of the position distribution. While the force on the tube rack 1 is balanced, the liquid in the vas deferens 8 can be more evenly diffused to various positions of the rack, accelerating its uniform degradation. In the present application, the hollow holes 4 can be square, circular, elliptical, etc., and there is no specific limitation, as long as the structural strength of the tube rack 1 is not affected.

[0044] See also Figure 1 and Figure 3 As shown, in some embodiments, an indicator band 5 is provided in the middle of the tube holder 1, and the first and second anti-slip structures 2 and 3 are symmetrical about the indicator band 5. During the operation, the operator can use the indicator band 5 to identify whether the implantation depth meets the requirements. Compared with the existing stent without the indicator band 5, the present application relies on visual indication to ensure that the tube holder 1 is symmetrically implanted at both ends of the insemination section, so that the pulling force received by both ends is close to the same, reducing the risk of disconnection at the anastomosis. Preferably, the indicator band 5 is a white zebra-patterned indicator band 5 for easy identification.

[0045] In some embodiments, the diameter of the tube rack 1 is not less than 1 mm, and the length is not less than 5 mm; the total length of the first and second anti-slip structures 2 and 3 is not less than 2 mm. Because the inner diameter of the vas deferens 8 of adult Chinese men under natural conditions is 0.2 mm-0.85 mm, the diameter of the tube rack 1 is not less than 1 mm, which is sufficient to provide support to the wall of the vas deferens 8 and facilitate the support of the bracket tube disc on the mucosa and muscle layer of the vas deferens 8. In addition, the length of the tube rack 1 is not less than 5 mm, and the total lengths L1 and L2 of the first and second anti-slip structures 2 and 3 are not less than 2 mm, so as to ensure that the two ends of the tube rack 1 are in full contact with the vas deferens 8 and ensure the reliability of the connection. Among them, L1 refers to the sum of the lengths of multiple first anti-slip structures 2 along the first direction, and L2 refers to the sum of the lengths of multiple second anti-slip structures 3 along the second direction.

[0046] In some embodiments, the pipe support 1 and the first and second anti - detachment structures 2, 3 are integrally formed of a biodegradable material. For example, the vas deferens anastomosis stent is rapidly formed by using nano 3D printing technology.

[0047] Among them, the biodegradable material is at least one natural biodegradable biomaterial such as sodium alginate, chitosan, or collagen, or at least one synthetic biodegradable biomaterial such as poly - L - lactide, poly (lactic - co - glycolic acid), or polydioxanone. These materials can be gradually degraded and absorbed by the semen flowing through the lumen within 7 - 14 days after the operation. After half a month of anastomosis, both ends of the vas deferens wall have grown well, the vas deferens are re - connected together, and semen can pass through without affecting any function of the vas deferens.

[0048] Furthermore, as Figure 2 shown, the wall thickness of the pipe support 1 gradually decreases from the middle to both sides. This makes the two ends of the pipe support 1 more easily decomposed than the middle part, ensuring that the middle part of the pipe support 1 is not affected during the healing stage of the vas deferens 8, and always being able to support and tighten the anastomosis position of the vas deferens 8. Along with the re - growth of the vas deferens 8 at the anastomosis site, the middle part of the pipe support 1 is also completely degraded.

[0049] See Figure 4 shown, in some embodiments, a structural layer 6 is provided on the surface of the vas deferens anastomosis stent. The structural layer 6 is a convex pattern or a groove, and it can be located on the pipe support 1 and / or the first and second anti - detachment structures 2, 3, thereby further enhancing the connection effect with the vas deferens 8.

[0050] See Figure 5 shown, in some embodiments, a drug layer 7 is provided on the surface of the vas deferens anastomosis stent. It can be located on the pipe support 1 and / or the first and second anti - detachment structures 2, 3. The drug layer 7 contains at least one of antibacterial, analgesic, and wound - promoting agents. The specific types are not limited, and a stent with a suitable drug layer 7 can be selected according to the actual situation of the patient. By combining specific drugs for adjuvant treatment of the anastomosis site of the vas deferens 8, problems such as postoperative inflammation and infection can be further reduced, the healing cycle can be shortened, and the anastomosis success rate can be improved.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above - mentioned embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principle and purpose of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above - mentioned embodiments within the scope of the present invention. All these changes should fall within the protection scope of the claims of the present invention.

Claims

1. A vas deferens anastomosis stent, characterized in that, Including: A pipe support (1) provided with a plurality of hollow holes (4) thereon; First and second anti - detachment structures (2, 3) respectively arranged at two ends of the pipe support (1) and having opposite anti - detachment directions.

2. The vas deferens anastomosis stent according to claim 1, characterized in that, The first and second anti - detachment structures (2, 3) are both elastic disc - shaped members.

3. The vas deferens anastomosis stent according to claim 2, characterized in that, The number of the first anti - detachment structures (2) is multiple and they are spaced along a first direction; the number of the second anti - detachment structures (3) is multiple and they are spaced along a second direction.

4. The vas deferens anastomosis stent according to claim 2, wherein The protruding height of the disc - shaped member is 0.2 mm - 0.3 mm, and the included angle between the inner side surface of the disc - shaped member and the outer peripheral surface of the pipe support (1) is 30° - 60°.

5. The vas deferens anastomosis stent according to claim 2, characterized in that, The hollow holes (4) are circumferentially spaced between adjacent disc - shaped members.

6. The vas deferens anastomosis stent according to claim 1, characterized in that, An indicating strip (5) is arranged in the middle of the pipe support (1), and the first and second anti - detachment structures (2, 3) are symmetric about the indicating strip (5).

7. The vas deferens anastomosis stent according to claim 1, wherein The diameter of the pipe support (1) is not less than 1 mm and the length is not less than 5 mm; The total lengths L1 and L2 of the first and second anti - detachment structures (2, 3) are not less than 2 mm respectively.

8. The vas deferens anastomosis stent according to claim 1, characterized in that, The pipe support (1) and the first and second anti - detachment structures (2, 3) are integrally formed by a biodegradable material.

9. The vas deferens anastomosis stent according to claim 1, characterized in that, A structural layer is provided on the surface of the vas deferens anastomosis stent, and the structural layer is a convex pattern or a groove.

10. The vas deferens anastomosis stent according to claim 1, wherein A drug layer (6) is provided on the surface of the vas deferens anastomosis stent, and the drug layer (6) contains at least one of bacteriostatic, analgesic, and wound - promoting agents.

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