Magnetic response telescopic lymph-vein drainage anastomosis bridging device

Abstract

The invention relates to the technical field of medical instruments, and discloses a magnetic response telescopic lymph-vein drainage anastomosis bridging device which comprises an outer tube and an inner tube, a tube cavity is formed by a gap between the inner wall of the outer tube and the outer wall of the inner tube, a three-dimensional spiral telescopic structure is arranged in the tube cavity, and the three-dimensional spiral telescopic structure is arranged around the outer wall of the inner tube. The three-dimensional spiral telescopic structure comprises an absorbable suture line and a magnetic line, line harnesses woven by the absorbable suture line and the magnetic line are mutually wound to form a spiral line, the spiral line enables a lumen gap to form a spiral gap, and the spiral gap is used for guiding lymph liquid to flow to a vein; under the control and adjustment of the magnetic field, the magnetic line deformation drives the absorbable suture to deform and then drives the contraction and expansion deformation of the outer tube and the inner tube structure, the cross section area in the device is changed, so that the spiral gap is changed, and after the control and adjustment of the magnetic field are completed, the deformed shape can be kept unchanged within a quite long time; the aim of controlling the flow direction, the flow speed and the flow quantity of lymph and blood flowing through the device is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a magnetoresponsive telescopic lymphatic-venous drainage anastomosis bridging device. Background Art

[0002] Lymphatic-venous drainage is a precise anastomosis of lymphatic vessels and veins. As a surgical technique, it is used to improve lymphatic circulation, promote the return of lymphatic fluid, drain the lymphatic fluid that has nowhere to go into the veins, and enable the smooth return of lymphatic fluid, thereby achieving the purpose of eliminating swelling. In the prior art, after the establishment of lymphatic-venous drainage anastomosis, the flow rate and flow volume of lymphatic fluid at the anastomosis site cannot be precisely adjusted, resulting in the inability to precisely control the drainage effect. When lymphatic-venous pressure inversion occurs, there is a lack of means to promptly detect the pressure inversion and effective measures to prevent the backflow of venous blood into the lymphatics. Therefore, there is an urgent need for an adjustable bridging device for lymphatic-venous drainage anastomosis to effectively solve the problems of adjusting the drainage flow rate and flow volume after the establishment of lymphatic-venous drainage anastomosis. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a magnetoresponsive telescopic lymphatic-venous drainage anastomosis bridging device. The magnetoresponsive telescopic lymphatic-venous drainage anastomosis bridging device of the present invention is formed by the mutual winding of a bundle of absorbable sutures and magnetic wires to form a helix. Under the control and regulation of a magnetic field, the deformation of the magnetic wire drives the deformation of the absorbable suture, and then drives the contraction and expansion deformation of the outer tube and inner tube structures, changing the cross-sectional area inside the device to cause a change in the helical gap. It can facilitate the subsequent adjustment of the contraction and expansion of the inner wall lumen of the device using an external magnetic field generator. After the control and regulation of the three-dimensional helical telescopic structure by the magnetic field are completed, it can maintain the deformed shape without change for a quite long period of time, thereby achieving the purpose of controlling the flow direction, flow rate, and flow volume of lymph and blood flowing through the device.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A venous-lymphatic fistula bridging device includes an outer tube and an inner tube. The gap between the inner wall of the outer tube and the outer wall of the inner tube forms a lumen. A support structure is provided inside the lumen. The support structure adopts a three-dimensional helical telescopic structure. The three-dimensional helical telescopic structure is arranged around the outer wall of the inner tube. The three-dimensional helical telescopic structure includes absorbable sutures and magnetic wires. The bundle of absorbable sutures and magnetic wires is wound around each other to form a helix. The helix forms a helical gap in the lumen gap, and the helical gap is used to guide the flow of lymphatic fluid to the vein. Under the control and regulation of a magnetic field, the deformation of the magnetic wire drives the deformation of the absorbable suture, and then drives the contraction and expansion deformation of the outer tube and inner tube structures, changing the cross-sectional area inside the device to cause a change in the helical gap, so as to achieve the purpose of regulating the flow volume of lymph and blood flowing through the device.

[0005] A plurality of absorbable sutures are provided, and one magnetic wire is provided.

[0006] Three absorbable sutures are provided.

[0007] The absorbable suture is made of polycaprolactone material, and the magnetic wire is made of a medical-grade magnetic alloy material.

[0008] The outer tube and the inner tube are made of poly(lactic-co-glycolic acid) material.

[0009] An anticoagulant coating is provided on the surfaces of the outer tube, the inner tube, and the support structure.

[0010] The outer diameter of the outer tube is 3 - 5 mm, and correspondingly, the inner diameter of the inner tube is 1 - 4 mm.

[0011] The spiral angle of the spiral wire in the initial state is 45°.

[0012] The beneficial effects of the present invention are as follows: 1. The magnetic-responsive telescopic lymphatic-venous drainage anastomosis bridging device of the present invention includes an outer tube and an inner tube. The gap between the inner wall of the outer tube and the outer wall of the inner tube forms a lumen. The three-dimensional spiral telescopic structure includes absorbable sutures and magnetic wires. The wire bundles formed by braiding the absorbable sutures and the magnetic wires are wound around each other to form a spiral wire. The spiral wire forms a spiral gap in the lumen gap. The spiral gap is used to guide the flow of lymphatic fluid to the vein. Since the three-dimensional spiral telescopic structure is composed of absorbable sutures and magnetic wires, under the control and regulation of the magnetic field, the deformation of the magnetic wire drives the deformation of the absorbable sutures, and then drives the contraction and expansion deformation of the outer tube and inner tube structures, so as to change the cross-sectional area inside the device and make the spiral gap change. It is convenient to use an external magnetic field generator to adjust the contraction and expansion of the inner lumen of the device wall in the later stage, so as to achieve the purpose of regulating the lymphatic and blood flow rates flowing through the device. And because the three-dimensional spiral telescopic structure can maintain the deformed shape without changing for a quite long time after the control and regulation of the magnetic field, the purpose of controlling the flow direction, flow rate, and flow volume of lymph and blood flowing through the device is achieved.

[0013] 2. The materials and structures of the double-layer lumen of the present invention have excellent mechanical properties, which can meet the requirements of repeated contraction and expansion. The magnetic induction characteristics of the magnetic wire are beneficial to magnetic field response, forming the chemical stability of the lumen structure material, which can ensure long-term use safety. Moreover, the corrosion resistance and anticoagulant characteristics of the lumen structure material ensure stability in the lymphatic and blood environment.

[0014] 3. A plurality of absorbable sutures are provided, and the wire bundles braided therefrom can reach and maintain a torsion of 1 - 2 Newtons, and can meet the tensile force requirements of the double-layer lumen structure deformation.

[0015] 4. The spiral angle of the spiral structure in the initial state is 45°, which can meet the shape requirements of the double-layer lumen structure deformation.

[0016] 5. An anticoagulant coating is provided on the surface of the support body, which can prevent the possibility of thrombus formation during the operation of the bridging device.

[0017] 6. The outer diameter of the outer tube is 3 - 5 mm, and the inner diameter of the inner tube is 1 - 4 mm. Both ends of the bridging device are respectively connected to the venous end and the lymphatic end, and can adapt to the lumen sizes of most lymphatic - venous bridging sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present invention in conjunction with the drawings and embodiments: Figure 1 It is a schematic cross - sectional structure diagram of an embodiment in the present invention.

[0019] In the figure, outer tube 1, inner tube 2, lumen 3, support structure 4, absorbable suture 41, magnetic wire 42. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to facilitate those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0021] As Figure 1 shown, a magnetically responsive telescopic lymphatic - venous drainage anastomosis bridging device includes an outer tube 1 and an inner tube 2. The gap between the inner wall of the outer tube and the outer wall of the inner tube forms a lumen 3. A support structure 4 is provided in the lumen. The support structure adopts a three - dimensional spiral telescopic structure, and the three - dimensional spiral telescopic structure is arranged around the outer wall of the inner tube. The three - dimensional spiral telescopic structure includes an absorbable suture 41 and a magnetic wire 42. The wire bundles formed by the intertwining of the absorbable suture 41 and the magnetic wire 42 are wound around each other to form a spiral wire. The spiral wire forms a spiral gap in the lumen gap, and the spiral gap is used to guide the lymph fluid to flow towards the vein.

[0022] Since the three - dimensional spiral telescopic structure is composed of the absorbable suture 41 and the magnetic wire 42, under the control and regulation of the magnetic field, the deformation of the magnetic wire 42 drives the deformation of the absorbable suture 41, and then drives the contraction and expansion deformation of the structures of the outer tube 1 and the inner tube 2, thereby changing the cross - sectional area inside the device and causing the spiral gap to change, so as to achieve the purpose of regulating the lymph and blood flow rates through the device. And because the three - dimensional spiral telescopic structure can maintain the deformed shape without changing for a quite long period of time after the control and regulation by the magnetic field, the purpose of controlling the lymph and blood flow directions, flow rates, and flow volumes through the device can be achieved.

[0023] A plurality of absorbable sutures 41 are provided, and one magnetic wire 42 is provided.

[0024] Three absorbable sutures 41 are provided. Multiple absorbable sutures are provided, and the wire harness woven by them can reach and maintain a torque of 1-2 Newtons and can meet the tensile force requirements of the deformation of the double-layer lumen structure.

[0025] The absorbable suture is made of polycaprolactone material, and the magnetic wire is made of medical-grade magnetic alloy material.

[0026] The outer tube 1 and the inner tube 2 are made of poly lactic acid-glycolic acid material.

[0027] The surfaces of the outer tube 1, the inner tube 2, and the support structure are provided with anticoagulant coatings. The anticoagulant coating provided on the surface of the support can prevent the possibility of thrombosis during the operation of the bridging device.

[0028] The outer diameter of the outer tube is 3-5 mm. Correspondingly, the inner diameter of the inner tube is 1-4 mm. The two ends of the bridging device are respectively connected to the venous end and the lymphatic end, and can adapt to the lumen sizes of most lymphatic-venous bridging sites.

[0029] The spiral angle of the spiral wire in the initial state is 45°. The spiral angle of 45° of the spiral structure in the initial state can meet the shape requirements of the deformation of the double-layer lumen structure.

[0030] The outer tube 1, the inner tube 2, and the three-dimensional spiral telescopic structure of the present invention have excellent mechanical properties, can reliably meet the requirements of repeated contraction and expansion. The magnetic induction characteristics of the magnetic wire are beneficial to magnetic field response, can reliably complete the action of structural deformation and can maintain the deformed shape without change for a quite long period of time. The chemical stability of the materials of the device of the present invention ensures long-term use safety, and at the same time, the corrosion resistance and anticoagulant characteristics ensure stability in the blood environment.

[0031] In the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for describing the present invention rather than requiring the present invention to be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The "connected" and "connected" in the present invention should be understood in a broad sense. For example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0032] The above is the preferred embodiment of the present invention, and the description of the specific embodiments is only for better understanding the idea of the present invention. For those of ordinary skill in the art in this technical field, several improvements or equivalent substitutions can also be made according to the principle of the present invention, and these improvements or equivalent substitutions are also regarded as falling within the protection scope of the present invention.

Claims

1. A magnetic response telescopic lymphatic-venous drainage anastomotic bridging device, characterized in that It includes an outer tube and an inner tube. A gap between the inner wall of the outer tube and the outer wall of the inner tube forms a lumen. A support structure is provided in the lumen. The support structure adopts a three-dimensional spiral telescopic structure. The three-dimensional spiral telescopic structure is arranged around the outer wall of the inner tube. The three-dimensional spiral telescopic structure includes absorbable sutures and magnetic wires. The wire bundles woven by the absorbable sutures and the magnetic wires are wound around each other to form a spiral line. The spiral line forms a spiral gap in the lumen gap. The spiral gap is used to guide the flow of lymphatic fluid to the vein. Under the control and regulation of a magnetic field, the deformation of the magnetic wire drives the deformation of the absorbable suture, and then drives the contraction and expansion deformation of the outer tube and inner tube structures, changing the cross-sectional area inside the device so that the spiral gap changes, realizing the regulation of the lymph and blood flow rates flowing through the drainage anastomosis bridging device.

2. The magnetoresponsive telescopic lymphatic-venous drainage anastomotic bridging device according to claim 1, wherein There are multiple absorbable sutures and one magnetic wire.

3. The magnetoresponsive telescopic lymphatic-venous drainage anastomotic bridging device according to claim 2, characterized in that, There are three absorbable sutures.

4. The magnetic response telescopic lymphatic-venous drainage anastomotic bridging device according to claim 1, characterized in that, The absorbable suture is made of polycaprolactone material, and the magnetic wire is made of a medical-grade magnetic alloy material.

5. The magnetic response telescopic lymphatic-venous drainage anastomotic bridging device according to claim 1, wherein The outer tube and the inner tube are made of poly lactic acid-glycolic acid material.

6. The magnetic response telescopic lymphatic-venous drainage anastomotic bridging device according to claim 1, characterized in that, The surfaces of the outer tube, the inner tube, and the support structure are provided with anticoagulant coatings.

7. The magnetoresponsive telescopic lymphatic-venous drainage anastomotic bridging device according to claim 1, characterized in that, The outer diameter of the outer tube is 3-5 mm. Correspondingly, the inner diameter of the inner tube is 1-4 mm.

8. The magnetic response telescopic lymphatic-venous drainage anastomotic bridging device according to claim 1, characterized in that The spiral angle of the spiral line in the initial state is 45°.

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