Vascular embolism structure

Abstract

The utility model relates to the technical field of medical instruments, in particular to a vascular embolism structure. A vascular embolism structure comprises a first ring wire and a second ring wire which are mutually wound, the height difference of the outer surface of the first ring wire and the outer surface of the second ring wire is smaller than 0.1 inch, and the vascular embolism structure has a first state horizontally extending and a second state suitable for being bent so as to facilitate filling. The utility model provides a blood vessel embolism structure which is small in pushing friction force.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a vascular embolism structure. Background Art

[0002] In recent years, vascular embolic structures have been the mainstay of embolic therapy. Literature has shown that setting fiber hairs on the embolic structure will increase thrombosis and achieve faster embolization, which is beneficial for immediate embolization. The fiber hair parameters in the embolic structure with fiber hairs are different, such as quantity, length, spacing, etc., which will lead to different thrombosis effects, thereby affecting the scope of application of the product and the immediate and long-term embolic effects. However, the above-mentioned embolic structure modifiers are fixed on the surface of the embolic structure, which will increase the friction during pushing and affect the final surgical effect. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large pushing friction force of the vascular embolization structure in the prior art, thereby providing a vascular embolization structure with small pushing friction force.

[0004] In order to solve the above technical problems, the utility model provides a vascular embolization structure, comprising:

[0005] The first and second coils of wire are intertwined, the difference in outer surface height between the first and second coils of wire is less than 0.1 inches, and have a first state of horizontally extending arrangement and a second state of being suitable for bending for packing.

[0006] Optionally, a transition structure is provided at the proximal end of the vascular embolization structure, and the transition structure is suitable for connecting the vascular embolization structure and the release structure.

[0007] Optionally, the transition structure is in the shape of a frustum, and the diameter of one end connected to the vascular embolization structure is larger than the diameter of the other end.

[0008] Optionally, the transition structure is a two-dimensional spiral structure with a diameter of 0.005-0.020 inches.

[0009] Optionally, the difference in height between the outer surfaces of the first and second loops of wire is less than 0.02 inches, or the difference in height between the outer surfaces of the first and second loops of wire is less than 0.002 inches.

[0010] Optionally, the transition structure is made of the same material as the first wire loop.

[0011] Optionally, the first wire loop is made of metal, and the second wire loop is made of non-metallic material.

[0012] Optionally, the first coil wire is a platinum-tungsten alloy or a platinum-iridium alloy, and the second coil wire is a fiber coil wire.

[0013] Optionally, the second coil wire is any one of polypropylene, nylon, polyester or polytetrafluoroethylene.

[0014] Optionally, the ratio of the first wire loop to the second wire loop is 1:0.1-5, and an arc structure is provided at the distal end of the vascular embolization structure, and the size of the arc structure ranges from 0.022 to 0.024 inches.

[0015] The technical solution of the utility model has the following advantages:

[0016] 1. The vascular embolization structure provided by the utility model is formed by the first coil of wire and the second coil of wire being intertwined to form the embolization structure, and the difference in height between the outer surfaces of the first coil of wire and the second coil of wire is less than 0.1 inches, that is, they are basically arranged flush, so that the surface of the overall product is smooth, the surface friction is reduced, the smooth performance during pushing is ensured, and the operation time is shortened.

[0017] 2. The vascular embolization structure provided by the utility model has a frustum-shaped transition structure at the proximal end of the vascular embolization structure, which reduces the gap between the vascular embolization structure and the core wire, ensures the release strength, and avoids the vascular embolization structure from being pulled apart, which affects the surgical effect.

[0018] 3. In the vascular embolization structure provided by the present invention, the transition structure is made of the same material as the first coil of wire and will not cause micro-electrochemical corrosion.

[0019] 4. In the vascular embolization structure provided by the utility model, the ratio of the first wire circle to the second wire circle is 1:0.1-5, and the second wire circle is a fiber wire circle, that is, the fiber wire circle accounts for a relatively high proportion, and its softness and coagulant properties can quickly achieve dense embolism and thrombosis, achieve the treatment purpose, and further reduce costs.

[0020] 5. The vascular embolization structure provided by the utility model and the arrangement of the arc structure at the distal end of the vascular embolization structure make it difficult for the vascular embolization structure to puncture the tumor wall or the blood vessel wall, thereby ensuring the surgical effect.

[0021] 6. The vascular embolization structure provided by the utility model, the fiber loop wire is any one of polypropylene, nylon, polyester or polytetrafluoroethylene, will not be absorbed after implantation in the body, and like the metal loop wire, can provide long-term support, can stably form a basket during tumor filling, and can be anchored in the blood vessel to prevent being washed away. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the vascular embolization structure provided by the utility model before being implanted into a human body;

[0024] Figure 2 A schematic diagram of the vascular embolization structure provided by the utility model after being implanted into a human body;

[0025] Figure 3 This is an enlarged schematic diagram of the proximal end of the vascular embolism structure.

[0026] Description of reference numerals:

[0027] 1. The first circle of wire; 2. The second circle of wire; 3. Transition structure; 4. Anti-untwisting line. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figures 1 to 3 A specific embodiment of the vascular embolization structure shown in the figure is that the end of the vascular embolization structure away from the operator when in use is the distal end, and the end close to the operator is the proximal end. When the vascular embolization structure is used for embolization in an aneurysm or a blood vessel, a certain three-level form is required to form a stable basket effect or anchoring effect. Therefore, the vascular embolization structure of this embodiment has a first state of horizontal extension and a second state suitable for bending for packing. When the vascular embolization structure is in the first state, it is cylindrical, and when it is in the second state, it is spherical, and the surface is smooth. The vascular embolization structure specifically includes a first coil wire 1 and a second coil wire 2 that are intertwined with each other, that is, the first coil wire 1 and the second coil wire 2 are arranged alternately and bent and wound in the same direction; the difference in the outer surface height of the first coil wire 1 and the second coil wire 2 is less than 0.1 inches, and they are basically flush, that is, in the first state, they are in the same horizontal plane, and in the second state, they are in the same curved surface, so as to minimize the friction during transportation. Preferably, the difference in the outer surface height of the first coil wire 1 and the second coil wire 2 is less than 0.02 inches. More preferably, the difference in height between the outer surfaces of the first coil of wire 1 and the second coil of wire 2 is less than 0.002 inches. No specific limitation is imposed herein. As long as the outer surfaces of the first coil of wire 1 and the second coil of wire 2 are substantially flush, the friction during transportation can be minimized to ensure smooth transportation.

[0031] The vascular embolization structure is tubular, and a transition structure 3 is provided at the proximal end, and the transition structure 3 is suitable for connecting the vascular embolization structure and the release structure. Specifically, the transition structure 3 is a frustum, and the diameter of one end connected to the vascular embolization structure is larger than the diameter of the other end. The transition structure 3 is a two-dimensional spiral structure with a diameter of 0.005-0.020 inches. The transition structure 3 is made of the same material as the first coil 1, so the connection between the two can be achieved by integral molding, or by knotting or gluing. Preferably, the first coil 1 is made of metal, and the second coil 2 is made of non-metallic material. More preferably, the first coil 1 is a platinum-tungsten alloy or a platinum-iridium alloy, and the second coil 2 is a fiber coil.

[0032] The volume ratio of the first wire loop 1 and the second wire loop 2 is 1:0.1-5, preferably 1:1, that is, the first wire loop 1 and the second wire loop 2 are alternately wound to form a tubular structure, and the amount of the first wire loop 1 and the second wire loop 2 is substantially equal. Of course, the ratio of the first wire loop 1 and the second wire loop 2 can also be adjusted according to actual needs, and no specific limitation is made here.

[0033] The first coil wire 1 is a platinum-tungsten alloy or a platinum-iridium alloy, and preferably a platinum 92% + tungsten 8% alloy is used to make the spring structure. The platinum material is an inert metal material with extremely excellent biocompatibility and stability, which can play a good role in thrombosis and will not cause toxicological problems due to long-term implantation. The mechanism of the vascular embolization structure to fill the aneurysm or vascular lesion is to promote the formation of thrombus at the lesion site, reduce the impact of blood on the fragile aneurysm wall in the aneurysm, and prevent the aneurysm from rupturing. In vascular lesions such as acute bleeding blood vessels or varicose veins, the vascular embolization structure can effectively block the bleeding or reduce the blood flow in the blood vessel, thereby achieving the purpose of treatment. Platinum tungsten has excellent development performance. Coil embolization is an interventional treatment operation. The material with development can better help the operator to locate the product and make a series of judgments during the operation. The platinum of the spring structure has excellent softness. The soft material performance can make the coil densely embolized during filling and quickly form thrombus; secondly, the soft material is not easy to damage the aneurysm wall or blood vessel wall, causing adverse phenomena such as vascular spasm.

[0034] The second wire coil 2 is any one of polypropylene, nylon knot, polyester or polytetrafluoroethylene structures. The soft material properties of the second wire coil 2 can make dense embolism and rapid thrombus formation during packing; secondly, the soft material is not easy to damage the aneurysm wall or blood vessel wall, causing adverse phenomena such as vascular spasm. The therapeutic purpose of the vascular embolism structure is to reduce blood flow in the blood vessels and form thrombi. The procoagulant properties of the polymer can promote the therapeutic efficiency of the entire vascular embolism structure. Traditional pure platinum belongs to precious metals and is expensive. The second wire coil 2 of this embodiment accounts for up to 50%, and the price of the second wire coil 2 is much lower than that of platinum materials, so the overall vascular embolism structure can be made cheaper.

[0035] The design of evenly mixing fiber coils and metal coils also plays a role in force transmission. Platinum metal can drive the soft fiber coils forward, and the proximal to distal force transmission efficiency reaches about 85%-95%. The three-dimensional structure of the vascular embolization structure is more stable than the two-dimensional structure during filling, and can form a basket more stably, providing a reliable framework for subsequent filling and closing coils without puncturing the aneurysm wall. In the vascular system coil embolization, the three-dimensional structure can be stably anchored in the blood vessel and will not be washed away by high-speed blood flow, causing blockage of clinical non-embolization sites and causing a series of clinical adverse events. In addition, if Figure 2 As shown, the three-dimensional structure is easier to turn at any time during the filling process, and the fiber coil wire and the metal coil wire are integrated, so that the overall vascular embolization structure can be turned at any time during the filling process.

[0036] In addition, the fiber loop wire can be further processed during extrusion as needed, such as drug loading treatment on the surface of the fiber loop wire, coating the surface of the fiber loop wire with anti-inflammatory drugs to promote tissue endothelialization; microporous treatment of the fiber loop wire, the fiber loop wire infiltrates blood and expands to make the embolism denser, etc.

[0037] The distal end of the vascular embolization structure is provided with an arc structure, the size of which ranges from 0.020 to 0.024 inches. The arc structure is formed by dispensing UV light-curing glue, which has stable biocompatibility, a smooth surface, and no hard protrusions. The amount of UV light-curing glue used is 0.01 to 0.1 ml.

[0038] Many traditional spring coils contain one or two anti-unwinding threads. In this embodiment, an anti-unwinding thread 4 can also be added to the mixed spring coil, and the material can be polypropylene, POE, PET, etc., and the size range is 0.001-0.002 inches.

[0039] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A vascular embolism structure, characterized in that: include: A first coil wire (1) and a second coil wire (2) are wound around each other, the difference in outer surface height between the first coil wire (1) and the second coil wire (2) is less than 0.1 inches, and the first coil wire (1) and the second coil wire (2) have a first state of horizontally extending arrangement and a second state of being suitable for bending for packing.

2. The vascular embolization structure according to claim 1, characterized in that: A transition structure (3) is arranged at the proximal end of the vascular embolization structure, and the transition structure (3) is suitable for connecting the vascular embolization structure and the release structure.

3. The vascular embolization structure according to claim 2, characterized in that: The transition structure (3) is in the shape of a truncated cone, and the diameter of one end connected to the vascular embolization structure is larger than the diameter of the other end.

4. The vascular embolization structure according to claim 3, characterized in that: The transition structure (3) is a two-dimensional spiral structure with a diameter of 0.005-0.020 inches.

5. The vascular embolization structure according to any one of claims 1 to 4, characterized in that: The difference in height between the outer surfaces of the first coil (1) and the second coil (2) is less than 0.02 inches, or The difference in height between the outer surfaces of the first coil wire (1) and the second coil wire (2) is less than 0.002 inches.

6. The vascular embolization structure according to any one of claims 2 to 4, characterized in that: The transition structure (3) is made of the same material as the first coil wire (1).

7. The vascular embolization structure according to claim 6, characterized in that: The first coil wire (1) is made of metal material, and the second coil wire (2) is made of non-metal material.

8. The vascular embolization structure according to claim 7, characterized in that: The first coil wire (1) is a platinum-tungsten alloy or a platinum-iridium alloy, and the second coil wire (2) is a fiber coil wire.

9. The vascular embolization structure according to claim 8, characterized in that: The second coil wire (2) is any one of polypropylene, nylon, polyester or polytetrafluoroethylene.

10. The vascular embolization structure according to any one of claims 1 to 4, characterized in that: The volume ratio of the first wire loop (1) to the second wire loop (2) is 1:0.1-5. The distal end of the vascular embolization structure is provided with an arc structure, and the size range of the arc structure is 0.022-0.024 inches.

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