Recyclable support and recycling system

Abstract

The invention provides a recoverable stent and a recovery system.The stent comprises a stent body which is of a columnar structure and is used for being arranged in a blood vessel, and the stent body is of a closed-loop stent structure; the recovery part is located at one end of the main body, a lifting part is arranged on the recovery part, the recovery part comprises one or a plurality of first traction wires, and the lifting part is composed of the first traction wires or connected with the first traction wires; the recovery part is connected with the main body through a first traction wire; when the lifting piece is pulled, the first traction wire can pull the stent body to be separated from the inner wall of the blood vessel. The recycling part is arranged on the stent body, the stent body is pulled and recycled through the pull wire, and stent recycling in the blood vessel is achieved.

Description

Technical Field

[0001] The present invention belongs to the medical field, and particularly relates to a retrievable stent and a retrieval system. Background Art

[0002] The accumulation of plaque in arteries is the cause of coronary heart disease. As time goes by, people with arterial stenosis may start to notice warning symptoms such as chest pain. If people suffering from this disease do not receive treatment, they are at a higher risk of developing complications such as heart attack or stroke.

[0003] As a medical device, one of the most common uses of a stent is to open blood vessels with plaque blockages. Plaque is the accumulation of cholesterol, fat, and other substances in the blood. When this plaque accumulates in the blood, it sticks to the arterial wall. Over time, this accumulation narrows the artery, restricting the amount of fresh blood that can reach the human body. By placing a stent in the artery, it can help keep the blood vessel open and restore blood flow to that area. Therefore, stents are commonly used to relieve blood vessel blockages and treat narrowed or weakened arteries.

[0004] Traditional stents are usually mesh metal tubes that fit against the inner wall of the human blood vessel after being applied to the human body and cannot be retrieved. Taking the Solitairey as an example of the existing retrievable stent, one end can be placed in the blood vessel, and the other end is provided with an operating rod. During use, it is necessary to control the stent to enter the blood vessel, release it, grab the thrombus in the blood vessel, and then pull the stent through the operating rod to retrieve the stent. The thrombus is grabbed during the retrieval process. However, this stent only serves a grabbing function and does not remain in the human body. Existing stents do not have the function of remaining in the human body for several days and then being retrieved. Summary of the Invention

[0005] The present invention provides a retrievable stent and a retrieval system to achieve the retrieval of the stent in the blood vessel.

[0006] The present invention provides a retrievable stent, and the stent includes:

[0007] A stent body, the stent body having a columnar structure for being disposed in a blood vessel, and the stent body being a closed-loop stent structure;

[0008] At least one retrieval part, the retrieval part being located at one end of the main body, a pulling member being provided on the retrieval part, the retrieval part including one or several first traction wires, and the pulling member being composed of the first traction wires or connected to the first traction wires;

[0009] The retrieval part is connected to the main body through the first traction wire;

[0010] When pulling the pulling member, the first traction wire can pull the stent body away from the inner wall of the blood vessel.

[0011] Further, the recovery part includes a plurality of first traction wires, and each of the first traction wires is connected to one end of the stent body at intervals.

[0012] Further, the recovery part is a warped structure that bends towards one side of the stent.

[0013] Furthermore, the recovery part further includes a number of second traction wires. One end of each second traction wire is connected to the stent body, and the other end of the second traction wire is connected to the first traction wire. When the lifting member is pulled, the first traction wire is pulled, and the second traction wire is driven to be pulled, so that multiple positions at one end of the stent are subjected to pulling forces, achieving the effect of pulling the stent.

[0014] Furthermore, the end of the stent body where the recovery part is provided is the pulling end. A number of stent mesh holes are provided on the stent body. At each position where the stent mesh hole faces the pulling end, a pulling wire or a first traction wire or a second traction wire is provided. The pulling wire or the first traction wire or the second traction wire can apply a pulling force towards the pulling end to the stent mesh hole, so that the stent mesh hole deforms towards the pulling end and detaches from the blood vessel inner wall.

[0015] Further, a fixing unit is provided on the lifting member, and the fixing unit is made of a magnetic material or a ferromagnetic metal material.

[0016] On the other hand, the present invention discloses a recovery system, including: a blood vessel stent recovery device, and the recoverable stent according to claims 1-6. The blood vessel stent recovery device includes:

[0017] A fixing part, which is used for fixing the blood vessel stent;

[0018] A pulling part, which is used for driving the fixing part to move so that the fixing part pulls the blood vessel stent;

[0019] A limiting part, which is used for limiting the stent pulled by the fixing part so that the diameter of the stent is reduced;

[0020] A receiving part, which is used for receiving the stent limited by the limiting part.

[0021] A hook is provided on the fixing end, and the hook can be hooked and fixed to the lifting member.

[0022] Further, the blood vessel stent recovery device further includes an operating part, which is used for driving the pulling part to stretch or rotate.

[0023] Further, a magnetic part is provided on the fixing end, and a fixing unit on the lifting member of the stent can be adsorbed to the magnetic part.

[0024] Further, the pulling part is a connecting rod, the fixing part is arranged at one end of the connecting rod, the accommodating part is a sheath tube, the connecting rod is movably arranged in the sheath tube, and the limiting part is arranged at one end of the sheath tube.

[0025] Compared with the prior art, the present invention realizes the retrieval of the stent in the blood vessel by setting a retrieval part on the stent body and using a traction wire to pull and retrieve the stent body. At the same time, the present invention uses a closed-loop stent as the stent body. Due to the reticular structure of the closed-loop stent, applying force to one end of the pull can apply force to the whole stent, facilitating the pulling and storage of the stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the stent in the blood vessel;

[0027] Figure 2 Schematic diagram of the retrieval positioning;

[0028] Figure 3 Schematic diagram of releasing the fixing part;

[0029] Figure 4 Schematic diagram of the hooking process;

[0030] Figure 5 Schematic diagram of the pulling process;

[0031] Figure 6 Schematic diagram of the optional structure of the stent in the deployed state;

[0032] Figure 7 Schematic diagram of the structure with the second traction wire;

[0033] Figure 8 Schematic diagram of the enlarged structure of the fixing part;

[0034] Figure 9 Schematic diagram of the claw structure;

[0035] Figure 10 Schematic diagram of the structure of the fixing part with a magnetic part;

[0036] Figure 11 Schematic diagram of the structure of the fixing part with multiple claws based on the magnetic part;

[0037] Figure 12 Schematic diagram of the structure of the stent with a fixing unit;

[0038] 1. Stent body; 11. Stent mesh hole; 2. Retrieval part; 21. Lifting part; 211. Fixing unit; 22. First traction wire; 23. Second traction wire; 3. Blood vessel stent retrieval device; 31. Fixing part; 311. Claw; 312. Magnetic part; 32. Pulling part; 33. Limiting part; 34. Accommodating part. DETAILED DESCRIPTION OF THE INVENTION

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0040] Taking Solitairey as an example of the existing retrievable stent, one end can be placed in a blood vessel, and the other end is provided with an operating rod. During use, it is necessary to control the stent to enter the blood vessel, release it, grab the thrombus in the blood vessel, and then pull the stent through the operating rod to recover the stent. The thrombus is grabbed during the recovery process. However, this stent only functions to grab and does not remain in the human body. Therefore, it can only grab large fixed thrombi in the blood, but cannot filter and collect flowing thrombi in the blood.

[0041] The embodiment of the present invention designs a retrievable stent to solve the above problems. After being placed in the human body and grabbing and filtering larger thrombi in the blood for a certain time, the stent is recovered through surgery.

[0042] The embodiment of the present invention specifically discloses a retrievable stent, and the stent includes:

[0043] A stent body 1, the stent body 1 has a columnar structure and is used to be arranged in a blood vessel, and the stent body 1 is a closed-loop stent structure;

[0044] At least one recovery part 2, the recovery part 2 is located at one end of the main body, a lifting member 21 is provided on the recovery part 2, the recovery part 2 includes one or several first traction wires 22, and the lifting member 21 is composed of the first traction wires 22 or is connected to the first traction wires 22;

[0045] The recovery part 2 is connected to the main body through the first traction wire 22;

[0046] When pulling the lifting member 21, the first traction wire 22 can pull the stent body 1 away from the inner wall of the blood vessel.

[0047] Among them, the stent is applied to the cerebrovascular, as Figures 1-5 shown, the stent is arranged in the blood vessel. When releasing the stent, the end of the stent without the recovery part 2 is released first, and the recovery part 2 is finally released from the blood vessel. The stent body 1 in the embodiment of the present invention is a closed-loop stent structure, and optional styles are as Figure 2 、 Figure 3 shown. The lifting member 21 in the embodiment of the present invention is a lifting structure in the shape of an arc-like handle composed of multiple first traction wires 22, which can facilitate the engagement of structures such as the hook claw 311. When the lifting member 21 is pulled in the blood vessel, the lifting member 21 drives the first traction wire 22, and the first traction wire 22 pulls one end of the stent body 1 away from the inner wall of the blood vessel to realize the recovery of the stent.

[0048] In the embodiment of the present invention, a recovery part 2 is arranged on the stent main body 1, and the traction wire is used to realize the pulling and recovery of the stent main body 1, so as to realize the recovery of the stent in the blood vessel. At the same time, in the embodiment of the present invention, by using a closed-loop stent as the stent main body 1, and utilizing the mesh structure of the closed-loop stent, applying force to one end of the traction can realize the overall force application to the stent, which is convenient for pulling and storing the stent.

[0049] The stent main body 1 does not have an independent convex structure along the axial direction of the stent (the convex structures along the axial direction of the stent in the embodiment of the present invention all have corresponding traction wires for traction). If a convex structure is provided at the axis of the stent, during the recovery process, it is easy to generate a large scraping force on the inner wall of the blood vessel in the axial direction, resulting in damage to the inner wall of the blood vessel. In the embodiment of the present invention, by adopting various styles as Figure 6 shown, the independent convex structure on the axial direction of the stent is avoided, thereby preventing the scraping of the inner wall of the blood vessel during the recovery process and improving the recovery safety.

[0050] Optionally, the recovery part 2 includes a plurality of first traction wires 22, and each of the first traction wires 22 is connected to one end of the stent main body 1 at intervals.

[0051] Among them, as Figure 6 shown, the recovery part 2 can be provided with 2, 3 or more first traction wires 22 for fixedly connecting with the stent main body 1.

[0052] In the embodiment of the present invention, by arranging a plurality of first traction wires 22, the stent main body 1 can be pulled from multiple positions simultaneously during pulling, improving the force uniformity of the stent main body 1 and reducing the risk of the stent main body 1 shifting in the blood vessel due to uneven force.

[0053] It should be noted that Figure 6 is the stent deployment pattern in the embodiment of the present invention. The stent can adopt the Figure 6 structure, or on the basis of Figure 6 , connect the upper edge and the lower edge of the Figure 6 stent to form a columnar structure (a columnar stent structure can also be formed by laser engraving or other methods based on tubular raw materials).

[0054] Optionally, the recovery part 2 is a warped structure bent towards one side of the stent.

[0055] Among them, taking the recovery part 2 with two first traction wires 22 as an example, the recovery part 2 is a non-planar structure, but an arc-shaped structure bent towards one side.

[0056] In the embodiment of the present invention, by setting the recovery part 2 as a bent warped structure, it can be in contact with the inner wall of the blood vessel in the blood vessel, improving the fixation of the stent and avoiding the stent moving in the blood vessel under the influence of blood flow.

[0057] Specifically, as Figure 7 shown, the recovery part 2 further includes a plurality of second traction wires 23. One end of each second traction wire 23 is connected to the bracket main body 1, and the other end of each second traction wire 23 is connected to the first traction wire 22. When pulling the lifting part 21, the first traction wire is pulled, and the second traction wire 23 is driven to be pulled, so that multiple positions at one end of the bracket are subjected to pulling force, achieving the effect of pulling the bracket.

[0058] Among them, the second traction wire 23 is not connected to one end of the first traction wire 22. In the embodiment of the present invention, two first traction wires 22 and two second traction wires 23 can be provided. During recovery, the doctor only needs to ensure that the lifting part can be grasped. During the process of pulling the first traction wire 22, the first traction wire 22 will drive the second traction wire 23, so as to realize the simultaneous pulling of multiple positions of the bracket main body 1.

[0059] In the embodiment of the present invention, by providing the second traction wire 23, the extension of the pulling point can be realized on the basis of the first traction wire 22, and the uniformity of the force received by the vascular stent during the pulling process can be improved. Based on this idea, the embodiment of the present invention can also additionally provide multiple second traction wires 23 to further improve the uniformity of the force received by the vascular stent.

[0060] Specifically, one end of the bracket main body 1 where the recovery part 2 is provided is the pulling end. A plurality of bracket mesh holes 11 are provided on the bracket main body 1. A pulling wire or a first traction wire 22 or a second traction wire 23 is provided at each position where the bracket mesh hole faces the pulling end. The pulling wire or the first traction wire 22 or the second traction wire 23 can apply a pulling force towards the pulling end to the bracket mesh hole 11, so that the bracket mesh hole 11 deforms towards the pulling end and detaches from the blood vessel inner wall.

[0061] Among them, as Figure 6 shown, the bracket mesh hole 11 can be selected in various styles. When there are adjacent bracket mesh holes 11 at the position where the bracket mesh hole 11 faces the pulling end, the bracket structure forming the adjacent bracket mesh holes 11 is used as the pulling wire. If there are no adjacent bracket mesh holes 11 at the position where the bracket mesh hole 11 faces the pulling end, then the bracket mesh hole 11 is located at one end of the bracket main body 1, and the bracket mesh hole 11 is connected to the first pulling wire or the second pulling wire.

[0062] In the embodiment of the present invention, by ensuring that a pulling wire or a first traction wire 22 or a second traction wire 23 is provided at each position where the bracket mesh hole 11 faces the pulling end, during the pulling process, each bracket mesh hole 11 of the bracket main body 1 can be pulled in sequence with each other, so that the bracket mesh holes 11 are detached from the blood vessel inner wall in sequence, realizing the recovery of the bracket.

[0063] The pulling wire, the first pulling wire 22, and the second pulling wire 23 of the embodiment of the present invention are pulled together to form a joint structure. When recycling, by grabbing one of them, the remaining parts of the structure can be pulled up, thereby facilitating the subsequent stent recycling process.

[0064] Optional, such as Figure 12 As shown, the lifting member 21 is provided with a fixing unit 211 , and the fixing unit 211 is made of magnetic material or ferromagnetic metal material.

[0065] The fixing unit 211 may be selected as a magnetic bead or a ferromagnetic metal bead that can generate magnetic attraction with a magnet. During the recovery of the bracket, a magnetic hook 311 structure may be selected to achieve magnetic positioning and improve the possibility of recovery.

[0066] The embodiment of the present invention provides a fixing unit 211 so that the lifting member 21 of the bracket has a magnetic response capability, which facilitates the subsequent grabbing process of the bracket when the bracket is recovered, thereby simplifying the recovery process.

[0067] Another embodiment of the present invention discloses a recycling system, such as Figures 1-5 As shown, it includes: a vascular stent recovery device 3, the recyclable stent, and the vascular stent recovery device 3 includes:

[0068] A fixing portion 31, wherein the fixing portion 31 is used to fix the intravascular stent;

[0069] A pulling portion 32, wherein the pulling portion 32 is used to drive the fixing portion 31 to move so that the fixing portion 31 pulls the intravascular stent;

[0070] The limiting portion 33 is used to limit the bracket pulled by the fixing portion 31 so as to reduce the diameter of the bracket;

[0071] The accommodating portion 34 is used to accommodate the bracket limited by the limiting portion 33.

[0072] The fixing portion 31 is provided with a hook 311 , and the hook 311 can be hooked and fixed to the lifting member 21 .

[0073] Among them, Figure 9 As shown, the outer edge of the end of the hook 311 is a C-shaped smooth transition structure, which reduces the sharpness of the end of the hook 311 and avoids damage to the inner wall of the blood vessel. Figure 8 As shown, the recovery part 2 may be provided with a plurality of elastic threads, and the embodiment of the present invention is provided with 6 elastic threads, and the hook 311 is located at one end of the elastic thread, and the elastic threads are in an elastic expansion state without external force. Before the operation, the elastic thread is stored in the limiting part 33, and the doctor releases the pulling part 32, and the elastic thread can be released from the limiting part 33 to form an expanded claw-shaped structure, which is convenient for grasping.

[0074] The embodiment of the present invention provides an elastic wire structure, which, on the one hand, facilitates the removal of the fixing portion 31, and on the other hand, enables the fixing portion 31 to form an expanded grasping structure after the removal, thereby increasing the probability of hooking the lifting member 21. Figure 8 As shown, the elastic wire structure is arranged in an arc shape so that it has a certain elastic force and is convenient to be received in the accommodation portion 34 .

[0075] Optionally, the vascular stent retrieving device 3 further includes an operating part, and the operating part is used to drive the pulling part 32 to stretch or rotate.

[0076] The operating part is a remote operating terminal, and the doctor can control the operation outside the patient's body to stretch or rotate the pulling part 32, so as to facilitate the engagement of the hook 311 on the fixing part 31 with the lifting member 21.

[0077] Optional, such as Figure 10 As shown, a magnetic piece 312 is disposed on the fixed end, and a fixing unit 211 is disposed on the lifting piece 21 of the bracket to be adsorbed by the magnetic piece 312 .

[0078] The fixing portion 31 is provided with a fixing unit 211 at the upper end near the hook 311. The fixing unit 211 can be made of a magnetic material and is forwardly disposed on the fixing portion 31. During surgery, the fixing unit 211 can be magnetically fixed to the magnetic part 312 on the lifting member 21.

[0079] The embodiment of the present invention facilitates the positioning and fixing of the hook 311 and the lifting member 21 during the operation by setting the fixing unit 211. The embodiment of the present invention can set a magnetic member 312 on the fixing end, specifically a small magnetic ball, and set it on the fixing end by inlaying or other methods. The fixing unit 211 can be made of a metal material such as iron that can be adsorbed by a magnet. The magnetic member 312 can be adsorbed by the magnet by inlaying or mixing a magnetic material in the bracket, showing magnetic attraction, thereby facilitating the adsorption and fixing with the fixing unit 211 and facilitating the grabbing.

[0080] It should be noted that the stent of the present invention can be placed in the human body for 2-3 months. Since the stent itself has magnetism, MRI and other related tests cannot be performed while the stent is in the patient's body to ensure the patient's physical safety.

[0081] Optional, such as Figure 8 As shown, the fixing portion 31 is provided with three or more hooks 311, preferably the number of hooks 311 is 3-6, and each hook 311 is circular at the fixing portion 31 and arranged at equal angles for easy grasping. Figure 11As shown in the figure, a magnetic member 312 is provided above the claw 311. During the process of grasping and extracting the part, it is only necessary to first ensure that the fixing unit 211 is adsorbed to the magnetic member 312, so that the claw 311 and the pulling part 32 are respectively located on both sides of the fixing unit 211. By pulling the pulling part 32, the magnetic member 312 of the fixing part 31 is staggered from the fixing unit 211. After the fixing unit 211 and the magnetic member 312 slide apart, there is a high probability that the lifting part 21 will then come into contact with the claw 311, so that the claw 311 is engaged with the lifting part 21.

[0082] Optionally, the pulling part 32 is a connecting rod, the fixing part 31 is arranged at one end of the connecting rod, the accommodating part 34 is a sheath tube, the connecting rod is movably arranged in the sheath tube, and the limiting part 33 is arranged at one end of the sheath tube.

[0083] The operating part of the embodiment of the present invention can adopt structures such as a sheath tube commonly used in stent surgery, and can remotely control the claw 311 during the operation to realize the grasping and recovery process of the stent.

[0084] Optionally, in some embodiments, a drug coating may also be provided on the surface of the retrievable stent, such as a drug-eluting stent. The drug coating may be made of a material that can prevent intimal hyperplasia, so as to avoid adhesion between the retrievable stent and the blood vessel wall when the retrievable stent is in the blood vessel, and reduce the damage to the blood vessel during recovery.

[0085] Among them, the drug may be a coating formed by a combination of one or more drugs in the prior art for preventing intimal hyperplasia of blood vessels, which will not be elaborated here.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that after reading the specification of this application, they can still modify the specific implementation manners of the present invention or make equivalent replacements, but these modifications or changes do not depart from the protection scope of the pending claims of this invention application.

Claims

1. A recyclable stent, characterized in that: The support comprises: A stent body, wherein the stent body is a columnar structure, and is used to be arranged in a blood vessel, and the stent body is a closed-loop stent structure; At least one recovery part, the recovery part is located at one end of the main body, the recovery part is provided with a lifting member, the recovery part includes one or more first pulling wires, and the lifting member is composed of the first pulling wire or connected to the first pulling wire; The recovery part is connected to the main body through a first traction wire; When the lifting member is pulled, the first traction wire can pull the stent body away from the inner wall of the blood vessel.

2. A recyclable stent according to claim 1, characterized in that: The recovery portion includes a plurality of first traction wires, each of which is connected to one end of the stent body at intervals.

3. A recyclable stent according to claim 1, characterized in that: The recovery portion is a warping structure bent toward one side of the bracket.

4. A recyclable stent according to claim 3, characterized in that: The recovery part also includes a plurality of second traction wires, one end of which is connected to the bracket body, and the other end of which is connected to the first traction wire. When the lifting member is pulled, the first traction wire is pulled and drives the second traction wire to be pulled, so that multiple positions at one end of the bracket are subjected to pulling force, thereby achieving the effect of pulling the bracket.

5. A recyclable stent according to any one of claims 1 to 4, characterized in that: One end of the stent body with a recovery portion is the pulling end, and the stent body is provided with a plurality of stent meshes. Each of the stent meshes is provided with a pulling wire or a first pulling wire or a second pulling wire toward the pulling end. The pulling wire or the first pulling wire or the second pulling wire can apply a pulling force toward the pulling end to the stent mesh, thereby causing the stent mesh to deform toward the pulling end and detach from the inner wall of the blood vessel.

6. A recyclable stent according to claim 1, characterized in that: The lifting member is provided with a fixing unit, and the fixing unit is made of magnetic material or ferromagnetic metal material.

7. A recycling system, characterized in that: The recovery system comprises: a vascular stent recovery device and the recyclable stent according to claims 1-6, wherein the vascular stent recovery device comprises: A fixing part, which is used to fix the intravascular stent; A pulling part, which is used to drive the fixing part to move so that the fixing part pulls the intravascular stent; A limiting portion, the limiting portion is used to limit the bracket pulled by the fixing portion so as to reduce the diameter of the bracket; The accommodating part is used to accommodate the bracket limited by the limiting part. The fixed end is provided with a hook claw, and the hook claw can be hooked and fixed with the lifting member.

8. A recycling system according to claim 7, characterized in that: The vascular stent recovery device further comprises an operating part, and the operating part is used to drive the pulling part to stretch or rotate.

9. A recycling system according to claim 7, characterized in that: The fixed end is provided with a magnetic piece, and the lifting piece of the bracket is provided with a fixing unit which can be adsorbed with the magnetic piece.

10. A recycling system according to claim 7, characterized in that: The pulling part is a connecting rod, the fixing part is arranged at one end of the connecting rod, the accommodating part is a sheath tube, the connecting rod is movably arranged in the sheath tube, and the limiting part is arranged at one end of the sheath tube.

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