Recyclable medical stent as well as preparation method and recycling system thereof

Abstract

The invention belongs to the technical field of medical instruments, and discloses a recyclable medical stent and a preparation method and a recycling system thereof, the recyclable medical stent comprises a tubular body, the tubular body is provided with a plurality of layers of ring units in the length direction, the ring units are in a closed ring shape, and the ring units are unfolded in the circumferential direction of the ring to form a wavy line structure. Compared with an existing medical stent only made of degradable materials, the medical stent has better circumferential supporting performance and axial flexibility, compared with a superelastic stent only made of nickel-titanium alloy and other materials, the superelastic stent can be easily recycled after intervening in the human body, and the medical stent is convenient to use. The medicine is not left in the human body to influence the recovery of the human body after the treatment purpose is achieved. The technical problem that in the prior art, a traditional Chinese medical stent cannot achieve good circumferential supporting performance and axial flexibility while the stent can be wholly recycled or degraded by a human body is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a recyclable medical stent and a preparation method and a recycling system thereof. Background Art

[0002] In the medical field, stents have been widely used to be implanted in human lumens such as blood vessels, bile ducts, and trachea to maintain, open, or expand the lumens. In order to make the stent have better support performance, the stent is often made of highly elastic materials such as nickel-titanium alloy or cobalt-chromium alloy. Although these materials have good support performance, they cannot be degraded. After achieving the support purpose, the stent will still remain in the human body, which is not conducive to the recovery of the human body. Sometimes it will stimulate the body to have an inflammatory response, and even thrombosis will occur in the stent, which is life-threatening.

[0003] Currently, recyclable medical stents are often made of degradable materials such as magnesium alloys or zinc alloys. These stents have good degradability and will degrade and be absorbed by the human body after completing their supporting tasks, thereby reducing the impact on the human body. However, stents made of such materials usually have poor supporting performance due to their lack of elasticity.

[0004] Therefore, developing a recyclable scaffold with good supporting performance is a current research issue. Summary of the invention

[0005] In view of the above-mentioned defects, the purpose of the present invention is to propose a recyclable medical stent and its preparation method and recycling system. The technical problem that the medical stents in the prior art cannot achieve good circumferential support and axial flexibility while the stent as a whole can be recyclable or degraded by the human body. The proposed recyclable medical stent is easy to recycle and has good supporting performance.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A recyclable medical stent comprises a tubular body, wherein the tubular body is provided with a plurality of layers of ring units along the length direction, wherein the ring units are closed ring-shaped and the ring units are expanded into a wavy line structure along the ring circumference;

[0008] The ring units are provided with crests and troughs along the axial direction, and connecting brackets are provided between the ring units of several layers, and the connecting brackets connect the crests and troughs between two adjacent ring units;

[0009] The ring unit is provided with a first connection point and a second connection point, the first connection point and the second connection point divide the ring unit into a first ring segment and a second ring segment, the first ring segment is made of a material that is not degradable in the human body, and the second ring segment is made of a material that is degradable in the human body and absorbed by the human body;

[0010] The connecting bracket includes a first bracket and a second bracket, the first bracket connects the first connection point and the second connection point of adjacent ring units, the second bracket connects the crest part and the trough part of adjacent ring units excluding the first connection point and the second connection point, the first bracket is made of a material that is not degradable in the human body, and the second bracket is made of a material that is degradable in the human body and can be absorbed by the human body;

[0011] The tubular body is also provided with a recovery ring, and the recovery ring is used for connection with an external traction structure.

[0012] Preferably, the ring unit is composed of a plurality of structural units, the structural unit is V-shaped, the inflection point of the V-shaped structure of the structural unit is provided with an arc transition, the connection between adjacent structural units is provided with an arc transition, the structural units are connected in the same direction in sequence to form a ring-shaped wavy line structure, two adjacent ring units are mirror-imaged about a cross section B perpendicular to the axis A of the bracket, and the connecting bracket is straight.

[0013] Preferably, the number of the structural units in the ring unit is at least 4;

[0014] The first connection point and the second connection point in the same ring unit are located in the same structural unit, the first connection point and the second connection point are adjacent crest portions and trough portions, the second ring segment is the shorter side between the first connection point and the second connection point in the ring unit, and only one first connection point, one second connection point and one second ring segment are provided in each ring unit, and the first connection point, the second connection point and the second ring segment of adjacent ring units are mirror-arranged with respect to a cross section B perpendicular to the axis A of the stent.

[0015] Preferably, two recovery rings are provided, the first connection points of adjacent ring units are connected to the first connection points, and the second connection points of adjacent ring units are connected to the second connection points, and the recovery rings are respectively provided at the first connection points or the second connection points of the ring units at the head and tail ends of the tubular body, which are the outermost parts along the axial direction.

[0016] Preferably, one first bracket and a plurality of second brackets are arranged between two adjacent ring units.

[0017] Preferably, the first ring segment, the first bracket and the recovery ring are made of tungsten, platinum, zirconium, nickel, titanium or their alloys, and the second ring segment and the second bracket are made of iron, zinc, magnesium or their alloys.

[0018] Preferably, the recovery ring is connected to the first connection point of the first ring unit along the length direction of the tubular body, and the recovery ring is provided with an X-ray development marking point, and the material of the X-ray development marking point is gold, platinum or an alloy thereof.

[0019] Preferably, a coating layer is provided on the surface of the tubular body, and the coating layer is formed by coating a degradable polymer material.

[0020] A recovery system for a recyclable medical stent comprises a recovery hook, a sheath tube and the above-mentioned recyclable medical stent, wherein the recovery hook can be movably penetrated into the inner cavity of the sheath tube, the recovery hook is used to hook with the recovery ring of the recyclable medical stent, and the recovery hook is also used to pull the recyclable medical stent after being degraded, the diameter of the recovery hook is smaller than the inner diameter of the recovery ring, the inner diameter of the sheath tube is larger than the outer diameter of the recovery ring, and the diameter of the sheath tube is 1 mm to 3 mm.

[0021] A method for preparing a recyclable medical stent, used for preparing the recyclable medical stent according to any one of claims 1 to 9, comprising the following steps:

[0022] S1. A linear structure consisting of an integrally formed first ring segment, a first bracket and a recovery ring;

[0023] S2. Connecting the second ring segment and the second stent to the corresponding position to obtain a stent;

[0024] S3. Polish the surface of the stent to obtain a recyclable medical stent.

[0025] The technical solution provided by the present invention may include the following beneficial effects:

[0026] The whole forms a stable mesh tube-like structure. Compared with the recyclable medical stent in the prior art whose overall structure is woven, the medical stent of the present invention has better support. After the degradable second ring segment and the second stent are degraded in the human body, only the linear stent structure will remain of the recyclable medical stent, which can be easily hooked by the recovery hook to the recovery ring, and the medical stent can be recovered using the sheath and the recovery hook. Compared with the existing medical stents made only of degradable materials, the present invention has better circumferential support and axial flexibility. Compared with the superelastic stents made only of nickel-titanium alloy and other materials, the present invention can be recovered more easily after intervention in the human body, and will not remain in the human body after achieving the treatment purpose to affect the recovery of the human body. The technical problem that the medical stent in the prior art cannot achieve good circumferential support and axial flexibility while the stent as a whole is recyclable or degraded by the human body is solved.

[0027] The first connection point, the second connection point, the second ring segment and the recovery ring are all arranged near the intersection line C along the length direction on the same side of the tubular body, ensuring the force balance of the tubular body along the circumferential direction, and solving the problem that the recyclable medical stent is prone to twisting, rotation and deformation due to uneven circumferential force during use.

[0028] After the surface of the recyclable medical stent is coated, on the one hand, the mechanical properties of the recyclable medical stent can be increased; on the other hand, it can prevent tissue cells from proliferating inside the stent and thus clogging the recyclable medical stent after the recyclable medical stent is implanted in the human body; thirdly, part of the coating will remain on the recyclable medical stent during degradation, which will provide a certain lubrication effect when the recyclable medical stent is recycled, making recycling easier.

[0029] Recyclable medical stents can be prepared by laser engraving, lathe cutting and 3D printing technology, and the preparation method is easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a recyclable medical stent before degradation according to an embodiment of the present invention.

[0031] Figure 2 The figure is a schematic diagram of the structure of a recyclable medical stent after degradation according to an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the unfolded structure of a recyclable medical stent before degradation according to an embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the unfolded structure of a recyclable medical stent after degradation according to one embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the unfolded structure of a recyclable medical stent before degradation according to another embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the unfolded structure of a recyclable medical stent after degradation according to another embodiment of the present invention.

[0036] Figure 7 A schematic diagram of the use of a recovery system according to an embodiment of the present invention.

[0037] Among them: ring unit 1, structural unit 10, crest part 11, trough part 12, connecting bracket 2, first bracket 21, second bracket 22, first connecting point 31, second connecting point 32, first ring segment 41, second ring segment 42, recovery ring 5, recovery hook 61, sheath 62, bracket axis A, cross section B, intersection line C. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance.

[0040] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0043] A recyclable medical stent comprises a tubular body, wherein the tubular body is provided with a plurality of layers of ring units 1 along the length direction, wherein the ring units 1 are closed ring-shaped and the ring units 1 are expanded into a wavy line structure along the ring circumference;

[0044] The ring unit 1 is provided with a crest portion 11 and a trough portion 12 along the axial direction, and a connecting bracket 2 is provided between several layers of the ring units 1, and the connecting bracket 2 connects the crest portion 11 and the trough portion 12 between two adjacent ring units 1;

[0045] The ring unit 1 is provided with a first connection point 31 and a second connection point 32, the first connection point 31 and the second connection point 32 divide the ring unit 1 into a first ring segment 41 and a second ring segment 42, the first ring segment 41 is made of a material that is not degradable in the human body, and the second ring segment 42 is made of a material that is degradable in the human body and absorbed by the human body;

[0046] The connecting bracket 2 includes a first bracket 21 and a second bracket 22, the first bracket 21 connects the first connection point 31 and the second connection point 32 of the adjacent ring unit 1, the second bracket 22 connects the crest part 11 and the trough part 12 of the adjacent ring unit 1 excluding the first connection point 31 and the second connection point 32, the first bracket 21 is made of a material that is not degradable in the human body, and the second bracket 22 is made of a material that is degradable in the human body and can be absorbed by the human body;

[0047] The tubular body is also provided with a recovery ring 5, and the recovery ring 5 is used for connection with an external traction structure.

[0048] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, with this structure, the peaks 11 and troughs 12 between the multi-layer ring units 1 are opposite to each other and fixedly connected by the connecting bracket 2, forming a stable mesh tube structure as a whole. Compared with the recyclable medical stent in the prior art whose overall structure is woven, the medical stent of the present invention has better support. After the degradable second ring segment 42 and the second bracket 22 are degraded in the human body, the recyclable medical stent will only have a linear stent structure, which can be easily hooked by the recovery hook 61 to hook the recovery ring 5, and the medical stent can be recovered by the sheath and the recovery hook 61. Compared with the existing medical stent made of only degradable materials, the present invention has better circumferential support and axial flexibility. Compared with the superelastic stent made of only nickel-titanium alloy and other materials, the present invention can be easily recovered after intervening in the human body, and will not remain in the human body after achieving the treatment purpose to affect the recovery of the human body. The technical problem that the medical stent in the prior art cannot achieve good circumferential support and axial flexibility while the stent as a whole is recyclable or degraded by the human body is solved.

[0049] Preferably, the ring unit 1 is composed of a plurality of structural units 10, the structural unit 10 is V-shaped, the inflection point of the V-shaped structure of the structural unit 10 is provided with an arc transition, the connection between adjacent structural units 10 is provided with an arc transition, the structural units 10 are connected in the same direction in sequence to form a ring-shaped wavy line structure, two adjacent ring units 1 are mirror-imaged about a cross section B perpendicular to the axis A of the bracket, and the connecting bracket 2 is straight.

[0050] like Figure 3 As shown, in a specific embodiment, the connecting bracket 2 is short rod-shaped, the structural units 10 in the same layer of ring units 1 are arranged in the same direction in a V shape, and the V shapes of the structural units 10 in two adjacent layers of ring units 1 are arranged in opposite directions, and the connecting bracket 2 connects the tops of the V shapes of the structural units 10 in two adjacent layers of ring units 1 to form a mesh-like rhombus-shaped net tube. With this structure, the bracket as a whole has good circumferential support and axial flexibility.

[0051] Preferably, the number of the structural units 10 in the ring unit 1 is at least 4;

[0052] The first connection point 31 and the second connection point 32 in the same ring unit 1 are located in the same structural unit 10, the first connection point 31 and the second connection point 32 are adjacent the crest portion 11 and the trough portion 12, the second ring segment 42 is the shorter side between the first connection point 31 and the second connection point 32 in the ring unit 1, and only one first connection point 31, one second connection point 32 and one second ring segment 42 are provided in each ring unit 1, and the first connection point 31, the second connection point 32 and the second ring segment 42 of adjacent ring units 1 are mirror-arranged about the cross section B perpendicular to the axis A of the bracket.

[0053] Preferably, two recovery rings 5 ​​are provided, the first connection points 31 of adjacent ring units 1 are connected to the first connection points 31, and the second connection points 32 of adjacent ring units 1 are connected to the second connection points 32, and the recovery rings 5 ​​are respectively provided at the first connection points 31 or the second connection points 32 of the ring units 1 at the head and tail ends of the tubular body, which are the outermost parts along the axial direction.

[0054] like Figure 3 As shown, with this structure, the first connection point 31, the second connection point 32, the second ring segment 42 and the recovery ring 5 are all arranged near the intersection line C along the length direction on the same side of the tubular body, ensuring the circumferential force balance of the tubular body and solving the problem of the overall twisting and rotational deformation of the stent due to uneven circumferential force during use.

[0055] like Figure 6 As shown, by adopting the structure of two recovery rings 5 ​​at the head and the tail, the medical stent can be recovered from a better direction according to the actual situation.

[0056] Preferably, one first bracket 21 and a plurality of second brackets 22 are disposed between two adjacent ring units 1 .

[0057] With this structure, after the degradable second ring segment 42 and the second stent 22 in the tubular body are completely degraded, the remaining first ring segment 41 and the first stent 21 are connected to form a circuitous curve structure, and the recovery ring 5 is located at the two end points of the curve. The recovery hook 61 is passed through the sheath to hook one of the recovery rings 5, and a pulling force is applied to deform the curved structure of the stent into a structure closer to a straight line, and then pulled into the sheath for easy recovery.

[0058] like Figure 3 As shown, in one embodiment, the number of the second brackets 22 between adjacent ring units 1 is five.

[0059] like Figure 5 As shown, in a more preferred embodiment, the number of second brackets 22 between adjacent ring units 1 is two, which can greatly reduce the workload during bracket welding.

[0060] Preferably, the first ring segment 41, the first bracket 21 and the recovery ring 5 are made of tungsten, platinum, zirconium, nickel, titanium or their alloys, and the second ring segment 42 and the second bracket 22 are made of iron, zinc, magnesium or their alloys.

[0061] With this structure, most of the supporting structures in the stent, including the first ring segment 41, the first bracket 21 and the recovery ring 5, are made of non-degradable metals such as tungsten, platinum, zirconium, nickel and titanium or their alloys with good elasticity, and the second ring segment 42 and the second bracket 22 are made of iron, zinc, magnesium or their alloys that can be degraded in the human body. Before degradation, the stent as a whole has better circumferential support and axial flexibility.

[0062] Preferably, the first ring segment 41 and the second ring segment 42, and the first ring segment 41 and the second bracket 22 are connected by welding.

[0063] In a specific embodiment, after the recovery ring 5, the first ring segment 41 and the first bracket 21 are integrally formed, the second ring segment 42 and the second bracket 22 are welded by gas arc welding to form a mesh tube structure. As a simple alternative, ion welding, laser welding and electron beam welding can be used for connection and fixing.

[0064] Preferably, the welding material used for welding is iron, zinc, magnesium, gold, silver or their alloys.

[0065] Since the melting points of the non-degradable material used in the first ring segment 41 and the degradable material used in the second ring segment 42 and the second bracket 22 are quite different, in order to ensure a better connection, welding is performed using welding materials with lower melting points such as iron, zinc, magnesium, gold, silver metals or their alloys, so that the connection position between the first ring segment 41 and the second ring segment 42 and the second bracket 22 is completely covered in the molten welding material, making the connection stronger. In addition, welding using welding materials has lower equipment requirements than welding without welding materials using methods such as laser welding.

[0066] Preferably, the recovery ring 5 is connected to the first connection point 31 of the first ring unit 1 along the length direction of the tubular body, and the recovery ring 5 is provided with an X-ray development marking point, and the material of the X-ray development marking point is gold, platinum or its alloy.

[0067] The X-ray development marking points are used to facilitate positioning of the recovery ring 5 in the human body, thereby facilitating the recovery of the stent.

[0068] Preferably, a coating layer is provided on the surface of the tubular body, and the coating layer is formed by coating a degradable polymer material.

[0069] In a specific embodiment, the coating material is selected from at least one of polylactic acid, polyglycolic acid, polycaprolactone and polyethylene glycol and other degradable polymer materials. After the surface of the recyclable medical stent is coated, firstly, the mechanical properties of the recyclable medical stent can be increased, secondly, tissue cells can be prevented from proliferating inside the recyclable medical stent after the recyclable medical stent is implanted in the human body, thereby blocking the stent, and thirdly, part of the coating will remain on the recyclable medical stent when it is degraded, which will provide a certain lubrication effect when the recyclable medical stent is recycled, making it easier to recycle.

[0070] Specifically, the diameter of the tubular body is 2 mm to 10 mm, and the wire diameter of the tubular body is 0.04 mm to 0.3 mm.

[0071] After the tubular body is manufactured, the bracket needs to be subjected to surface treatments such as sandblasting and polishing.

[0072] A recovery system for a recyclable medical stent comprises a recovery hook 61, a sheath tube 62 and the above-mentioned recyclable medical stent, wherein the recovery hook can be movably penetrated into the inner cavity of the sheath tube 62, and the recovery hook is used to hook with the recovery ring of the recyclable medical stent, and the recovery hook is also used to pull the recyclable medical stent after being degraded, the diameter of the recovery hook 61 is smaller than the inner diameter of the recovery ring 5, the inner diameter of the sheath tube 62 is larger than the outer diameter of the recovery ring 5, and the diameter of the sheath tube 62 is 1 mm to 3 mm.

[0073] like Figure 7As shown, with this structure, when the degraded recyclable medical stent is recovered, the recovery hook 61 is placed in the sheath 62 and inserted into the human body, and the recovery hook 61 hooks the recovery ring 5 to recover the degraded recyclable medical stent. The degraded recyclable medical stent is deformed as a whole into a linear shape and is recovered into the sheath 62 and removed from the human body.

[0074] In a specific embodiment, the first ring segment 41 is made of nickel-titanium alloy material with a certain elasticity and can be bent and deformed so as to be easily received into the sheath tube 62 .

[0075] A method for preparing a recyclable medical stent, used for preparing the above-mentioned recyclable medical stent, comprises the following steps:

[0076] S1. A linear structure consisting of an integrally formed first ring segment 41, a first bracket 21 and a recovery ring 5;

[0077] S2. Connecting the second ring segment 42 and the second bracket 22 to the corresponding positions to obtain a bracket;

[0078] S3. Polish the surface of the stent to obtain a recyclable medical stent.

[0079] In a specific embodiment, laser engraving technology is used to engrave the nickel alloy tube into an integral linear structure consisting of the first ring segment 41, the first bracket 21 and the recovery ring 5, and then the second ring segment 42 and the second bracket 22 made of magnesium alloy are welded to the corresponding positions, and then X-ray development marking points of platinum material are inlaid on the recovery ring 5, and finally the bracket is sandblasted and polished to remove sharp edges and burrs, and coated. The recyclable medical stent is manually bent, stretched and compressed to check that the welding is not loose and the recyclable medical stent as a whole will not deform or break.

[0080] In another embodiment, the linear structure in step S1 is produced by laser engraving on an alloy plate. This preparation method has lower requirements on equipment, but since the produced linear bracket structure is in a planar state, it needs to be wrapped and fixed on a round rod of appropriate size for heat treatment and shaping. After obtaining the tubular linear bracket structure, the second ring segment 42 and the second bracket 22 are welded on.

[0081] As a simple alternative, the alloy tubes or plates can also be turned using machine tools.

[0082] In another embodiment, the linear structure in step S1 is produced by metal 3D printing. This preparation method has the simplest process and the lowest cost, but since the recyclable medical stent is relatively small, the precision requirement for the printer is relatively high, and since the parts printed by 3D are relatively rough, more time and cost are required for sandblasting and polishing surface treatment.

[0083] In a more preferred implementation, when the linear structure is produced in step S1, an auxiliary bracket is produced at the position where the second ring segment 42 and the second bracket 22 need to be welded to form a complete mesh tube structure, and then the auxiliary brackets are cut one by one and the second ring segment 42 or the second bracket 22 are welded accordingly. With this preparation method, since only one connection structure needs to be welded at a time, the bracket as a whole still maintains the mesh tube shape, and fixing and welding are easier.

[0084] Specifically, the connection method in step S2 can be connected and fixed by at least one of gas arc welding, ion welding, laser welding and electron beam welding.

[0085] Other structures and operations according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0086] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0087] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A recyclable medical stent, characterized in that: The invention comprises a tubular body, wherein the tubular body is provided with a plurality of layers of ring units along the length direction, wherein the ring units are closed ring-shaped and the ring units are expanded into a wavy line structure along the ring circumference; The ring units are provided with crests and troughs along the axial direction, and connecting brackets are provided between the ring units of several layers, and the connecting brackets connect the crests and troughs between two adjacent ring units; The ring unit is provided with a first connection point and a second connection point, the first connection point and the second connection point divide the ring unit into a first ring segment and a second ring segment, the first ring segment is made of a material that is not degradable in the human body, and the second ring segment is made of a material that is degradable in the human body and absorbed by the human body; The connecting bracket includes a first bracket and a second bracket, the first bracket connects the first connection point and the second connection point of adjacent ring units, the second bracket connects the crest part and the trough part of adjacent ring units excluding the first connection point and the second connection point, the first bracket is made of a material that is not degradable in the human body, and the second bracket is made of a material that is degradable in the human body and can be absorbed by the human body; The tubular body is also provided with a recovery ring, and the recovery ring is used for connection with an external traction structure.

2. A recyclable medical stent according to claim 1, characterized in that: The ring unit is composed of a plurality of structural units, and the structural unit is V-shaped. The inflection point of the V-shaped structure of the structural unit is provided with an arc transition, and the connection between adjacent structural units is provided with an arc transition. The structural units are connected in the same direction in sequence to form a ring-shaped wavy line structure. Two adjacent ring units are mirror-set about a cross section B perpendicular to the axis A of the bracket, and the connecting bracket is straight.

3. A recyclable medical stent according to claim 2, characterized in that: The number of the structural units in the ring unit is at least 4; The first connection point and the second connection point in the same ring unit are located in the same structural unit, the first connection point and the second connection point are adjacent crest portions and trough portions, the second ring segment is the shorter side between the first connection point and the second connection point in the ring unit, and only one first connection point, one second connection point and one second ring segment are provided in each ring unit, and the first connection point, the second connection point and the second ring segment of adjacent ring units are mirror-arranged with respect to a cross section B perpendicular to the axis A of the stent.

4. The recyclable medical stent according to claim 3, characterized in that: The recovery rings are provided with two, the first connection points of adjacent ring units are connected to the first connection points, the second connection points of adjacent ring units are connected to the second connection points, and the recovery rings are respectively provided at the first connection points or the second connection points of the ring units at the head and tail ends of the tubular body, which are the outermost along the axial direction.

5. The recyclable medical stent according to claim 3, characterized in that: One first bracket and a plurality of second brackets are arranged between two adjacent ring units.

6. The recyclable medical stent according to claim 1, characterized in that: The first ring segment, the first bracket and the recovery ring are made of tungsten, platinum, zirconium, nickel, titanium or their alloys, and the second ring segment and the second bracket are made of iron, zinc, magnesium or their alloys.

7. The recyclable medical stent according to claim 1, characterized in that: The recovery ring is connected to the first connection point of the first ring unit along the length direction of the tubular body, and the recovery ring is provided with an X-ray development marking point, and the material of the X-ray development marking point is gold, platinum or an alloy thereof.

8. A recyclable medical stent according to any one of claims 1 to 7, characterized in that: The surface of the tubular body is provided with a coating layer, and the coating layer is formed by coating with a degradable polymer material.

9. A recycling system for recyclable medical stents, characterized in that: It comprises a recovery hook, a sheath tube and the recoverable medical stent according to any one of claims 1 to 8, wherein the recovery hook can be movably penetrated into the inner cavity of the sheath tube, the recovery hook is used to hook with the recovery ring of the recoverable medical stent, and the recovery hook is also used to pull the recoverable medical stent after being degraded, the diameter of the recovery hook is smaller than the inner diameter of the recovery ring, the inner diameter of the sheath tube is larger than the outer diameter of the recovery ring, and the diameter of the sheath tube is 1 mm to 3 mm.

10. A method for preparing a recyclable medical stent, used for preparing the recyclable medical stent according to any one of claims 1 to 9, characterized in that The steps include: S1. A linear structure consisting of an integrally formed first ring segment, a first bracket and a recovery ring; S2. Connecting the second ring segment and the second stent to the corresponding position to obtain a stent; S3. Polish the surface of the stent to obtain a recyclable medical stent.

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