A retractable delivery guide wire

Abstract

The present invention discloses a retractable delivery guide wire, including a superselective development head end, a guide mandrel and a stent delivery mechanism. The superselective development head end is arranged at the head of the component, and is an annular structure with superselective blood vessel and development functions. The stent delivery mechanism is arranged on the outside of the guide mandrel and is slidably connected with the guide mandrel. The stent delivery mechanism is used to transport and recycle the stent. The superselective development head end can play the role of superselecting blood vessels and guiding catheters. The movement of the stent delivery mechanism is used to deliver the stent and recycle the stent, so that the delivery guide wire can not only play the role of superselecting blood vessels, but also complete the transportation and recovery of the stent. During the transportation and release of the stent, the superselective development head end and the guide mandrel are kept stationary, and the superselective development head end will not move forward and puncture the blood vessel due to the transportation and release of the stent. At the same time, the structure of the superselective development head end also avoids the situation of puncturing the blood vessel, making the operation safer.

Description

Technical Field

[0001] The invention relates to the field of interventional instruments, and in particular to a retractable delivery guide wire. Background Art

[0002] Intracranial vascular aneurysm is a hemorrhagic stroke disease, and it is a common and frequently occurring disease in clinical practice, which causes rupture of cerebral blood vessels. It has the characteristics of high morbidity, high disability rate, high mortality rate and high recurrence rate, and is the main disease causing death and disability in middle-aged and elderly people. With the continuous increase of the elderly population and the improvement of living standards, the incidence of cerebrovascular disease is increasing.

[0003] With the development of medical technology, the treatment of intracranial aneurysms is to use interventional treatment with a blood flow guide device, and the current interventional surgeries rely on the cooperation of a delivery guidewire and a catheter to deliver the stent to the lesion site and then release it. In the document of patent application No. CN202021856462.0, a delivery guidewire and a treatment device are proposed. The recessed design of the driving component and the implant increases the contact area between each other, making the contact between the driving component and the implant more stable and making the implant easier to deliver. Currently, there are many types of guidewires on the market: neural microguidewires, delivery guidewires of blood flow guide devices, and delivery guidewires of embolization-assisted stents. These guidewires have different functions, and often multiple guidewires are needed to establish a pathway in one operation.

[0004] As a result, the existing products still have the following problems during use: First, although the neural micro-guidewire has super-selected blood vessels and a soft distal coil, its use conditions are limited and it cannot be used to deliver stents. The delivery guidewire of the dense mesh stent and the delivery guidewire of the embolization-assisted stent have the function of delivering stents, but such guidewires cannot be used to establish pathways. Micro guidewires and loach guidewires are needed to establish pathways before surgery. Therefore, there is a lack of a delivery guidewire that can be used for super-selected blood vessels and can also deliver / retrieve stents; secondly, during the release of the dense mesh stent, due to the high shortening rate of the dense mesh stent, the head end of the delivery guidewire will move forward to the blood vessel, and the guidewire will puncture the blood vessel, thereby increasing the risk of surgery; thirdly, when the stent needs to be delivered to a tortuous blood vessel, the part of the guidewire that has been out of the catheter will adhere to the wall, causing the stent to be unable to open. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a retractable delivery guide wire.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: including:

[0007] The superselection development head end is arranged at the head of the component and is a ring-shaped structure with superselection blood vessels and development functions;

[0008] A guide mandrel fixedly connected to the rear end of the superselection developing head;

[0009] The stent conveying mechanism is arranged on the outside of the guide core shaft and is slidably connected to the guide core shaft. The stent conveying mechanism is used to transport and recycle the stent.

[0010] Preferably, the bracket conveying mechanism includes a developing boss, a recovery pad, a conveying tube and a spiral tube. The conveying tube is a stepped tubular structure. The front end of the conveying tube is fixed with the developing boss and the recovery pad, and the rear end of the conveying tube is fixedly connected with the spiral tube.

[0011] Preferably, the superselective developing head end includes a developing ring arranged at the end, and the rear side of the developing ring is connected to a spirally arranged guide wire portion.

[0012] Preferably, the wire guide portion is shaped by heat treatment to maintain an angle difference between the direction of the developing ring and the conveying direction of the super-selective developing head end.

[0013] Preferably, the developing ring is configured to be spherical, and the pitch of the developing ring and the wire guide portion is configured to be twice the wire diameter.

[0014] Preferably, the recovery pad is made of elastic material.

[0015] Preferably, the developing boss is fixed to the conveying pipe by welding, the recovery pad is fixed to the conveying pipe by bonding, and the conveying pipe is fixed to the spiral pipe by welding.

[0016] Preferably, the delivery pipe is made of metal alloy or polymer material.

[0017] Preferably, the guide mandrel is made of stainless steel or titanium-nickel.

[0018] Preferably, the spiral tube is made of stainless steel by laser cutting and pickling.

[0019] The present invention has the following beneficial effects:

[0020] 1. The superselection imaging head can play the role of superselecting blood vessels and guiding catheters. The movement of the stent delivery mechanism is used to deliver and retrieve the stent, so that the delivery guide wire can not only play the role of superselecting blood vessels, but also complete the transportation and recovery of the stent;

[0021] 2. During the transportation and release of the stent, the superselective imaging head and the guide mandrel remain stationary, and the superselective imaging head will not move forward and puncture the blood vessel due to the transportation and release of the stent. At the same time, the structure of the superselective imaging head also avoids puncturing the blood vessel, making the operation safer;

[0022] 3. When the stent needs to be delivered to a tortuous blood vessel, the guide core shaft can be pulled back to withdraw the superselective imaging tip, which can prevent the guide wire from contacting the inner wall and causing the stent to be unable to open, and can also prevent the superselective imaging tip from moving forward and puncturing the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the shape of the superselective developing head end of the present invention;

[0025] Figure 3 It is a schematic diagram of the guiding principle of the superselective developing head end of the present invention;

[0026] Figure 4 It is a schematic diagram of the guide mandrel structure of the present invention.

[0027] Legend:

[0028] 1. Superselective developing head end; 2. Developing boss; 3. Recovery pad; 4. Delivery pipe; 5. Spiral pipe; 6. Guide mandrel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Reference Figure 1-4 , an embodiment provided by the present invention includes:

[0032] The superselection development head end 1 is arranged at the head of the component and is a ring-shaped structure with superselection blood vessels and development functions;

[0033] A guide mandrel 6 is fixedly connected to the rear end of the superselection developing head end 1;

[0034] The stent conveying mechanism is arranged on the outside of the guide core shaft 6 and is slidably connected to the guide core shaft 6. The stent conveying mechanism is used to transport and recycle the stent.

[0035] Furthermore, the bracket conveying mechanism includes a developing boss 2, a recovery pad 3, a conveying tube 4 and a spiral tube 5. The conveying tube 4 is a stepped tubular structure. The front end of the conveying tube 4 is fixed with the developing boss 2 and the recovery pad 3, and the rear end of the conveying tube 4 is fixedly connected with the spiral tube 5.

[0036] Through this technical solution, the stent delivery mechanism can slide on the outside of the guide core shaft 6: the stent is fixed on the recovery pad 3, and pushing and pulling back the spiral tube 5 can drive the delivery tube 4 and the recovery pad 3 to advance and withdraw, thereby delivering the stent to the lesion site and recovering it.

[0037] Furthermore, the superselective developing head end 1 includes a developing ring arranged at the end, and the rear side of the developing ring is connected to a spirally arranged guide wire portion.

[0038] Through this technical solution, the front end of the superselective developing head 1 is made of platinum tungsten wire, platinum iridium wire, gold and other developable materials, and the wire diameter is usually between 0.04 and 0.06. It is wound on a stainless steel mandrel or a mandrel made of other materials to form a developing ring with a pitch usually slightly larger than the diameter of the wire, and then removed and trimmed to the required length, which can usually be 5mm, 10mm, 15mm, 20mm. The wire guide part is made of platinum tungsten alloy, which is convenient for heat treatment to be processed into different shapes.

[0039] Furthermore, the wire guide portion is shaped by heat treatment to maintain an angle difference between the direction of the developing ring and the conveying direction of the super-selective developing head end 1.

[0040] Through this technical solution, the guide wire portion is made of platinum tungsten alloy and can be processed into various shapes such as U-shape and 7-shape. The shape of the guide wire portion ensures that even if the superselective development tip 1 touches the blood vessel, the front end of the superselective development tip 1 will not puncture the blood vessel due to the introduction of the guide wire.

[0041] Furthermore, the developing ring is arranged to be spherical, and the pitch between the developing ring and the wire guiding part is arranged to be twice the wire diameter.

[0042] Through this technical solution, the developing ring is made into a spherical shape, which is round and full. Even if it touches the blood vessel, it will not puncture the blood vessel. The pitch of the developing ring and the guide wire part is usually twice the diameter of the wire, so that the superselective developing head end 1 has very good flexibility.

[0043] Furthermore, the recovery pad 3 is made of elastic material.

[0044] Through this technical solution, the elastic material of the recovery pad 3 can compress and store the bracket, and release it after reaching the designated position. In actual production, silicone and silicone oil can be mixed in a ratio of 10:1 and introduced into a designated mold to make a component that matches the delivery pipe 4.

[0045] Furthermore, the developing boss 2 is fixed to the conveying tube 4 by welding, the recovery pad 3 is fixed to the conveying tube 4 by bonding, and the conveying tube 4 is fixed to the spiral tube 5 by welding.

[0046] Through this technical solution, the developing boss 2 is connected to the conveying tube 4 through laser welding, silver-tin soldering and other processes, providing a developing function for the recovery and release process of the bracket during the conveying process. The recovery pad 3 and the conveying tube 4 are bonded together by UV glue under ultraviolet light, and can also be bonded together by quick-drying glue such as 4011. The conveying tube 4 and the spiral tube 5 are welded together by laser welding, and the guide core shaft 6 is pre-installed in the instrument.

[0047] Furthermore, the delivery pipe 4 is made of metal alloy or polymer material.

[0048] Through this technical solution, the delivery pipe 4 can be made of stainless steel, platinum iridium and other materials through machining and other means, and the material can also be nylon, PP, PTFE and other polymer materials.

[0049] Furthermore, the guide core shaft 6 is made of stainless steel or titanium-nickel.

[0050] Through this technical solution, the guide mandrel 6 can be a stainless steel mandrel, or a nickel-titanium mandrel made by grinding and other processes. The guide mandrel 6 has good torque transmission capability and softness.

[0051] Furthermore, the spiral tube 5 is made of stainless steel by laser cutting and pickling.

[0052] Through this technical solution, the spiral tube 5 is made of stainless steel through laser cutting, pickling and other processes, and has good pushing performance and soft performance.

[0053] Working principle: The delivery guide wire is composed of a superselective development tip 1, a guide mandrel 6 and a stent delivery mechanism, wherein the superselective development tip 1 is fixedly connected to the guide mandrel 6, and the superselective development tip 1 can be developed. When the delivery guide wire moves to the cross position of the blood vessels, the direction of the superselective development tip 1 can be adjusted by rotating the guide mandrel 6, and the microcatheter can be inserted into the diseased blood vessel along the superselective development tip 1; the recovery pad 3 on the stent delivery mechanism is used to fix and compress the stent, and the spiral tube 5 can slide on the outside of the guide mandrel 6, so as to When the stent is pushed to move, the superselective development tip 1 and the guide core shaft 6 remain stationary during the transportation, release and deployment of the stent, and the superselective development tip 1 will not puncture the blood vessel due to the transportation and release of the stent. At the same time, the head structure of the superselective development tip 1 also avoids puncturing the blood vessel, making the operation safer. When the stent needs to be delivered to a tortuous blood vessel, the guide core shaft 6 can be pulled back to withdraw the superselective development tip 1, which can prevent the guide wire from contacting the inner wall and causing the stent to be unable to open, and can also prevent the superselective development tip 1 from moving forward and puncturing the blood vessel.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A retractable delivery guide wire, characterized in that: include: The superselective developing head (1) is arranged at the head of the component and is a ring-shaped structure with superselective blood vessels and developing functions. The superselective developing head (1) comprises a developing ring arranged at the end, the developing ring is arranged in a spherical shape, the pitch of the developing ring and the wire guide part is arranged to be twice the wire diameter, the rear side of the developing ring is connected to the spirally arranged wire guide part, and the wire guide part is fixed by heat treatment to maintain an angle difference between the direction of the developing ring and the conveying direction of the superselective developing head (1); A guide mandrel (6) fixedly connected to the rear end of the superselection developing head end (1); A support conveying mechanism, wherein the support conveying mechanism is arranged on the outer side of a guide core shaft (6) and is slidably connected to the guide core shaft (6), the support conveying mechanism comprises a developing boss (2), a recovery pad (3), a conveying tube (4) and a spiral tube (5), the conveying tube (4) is a stepped tubular structure, the front end of the conveying tube (4) is fixed with a developing boss (2) and a recovery pad (3), the rear end of the conveying tube (4) is fixedly connected with a spiral tube (5), the developing boss (2) and the conveying tube (4) are welded and fixed, the recovery pad (3) and the conveying tube (4) are adhesively fixed, the conveying tube (4) and the spiral tube (5) are welded and fixed, and the support conveying mechanism is used to transport and recycle the support.

2. A retractable delivery guide wire according to claim 1, characterized in that: The recovery pad (3) is made of elastic material.

3. A retractable delivery guide wire according to claim 1, characterized in that: The delivery pipe (4) is made of metal alloy or polymer material.

4. A retractable delivery guide wire according to claim 1, characterized in that: The guide core shaft (6) is made of stainless steel or titanium-nickel.

5. A retractable delivery guide wire according to claim 1, characterized in that: The spiral tube (5) is made of stainless steel and is made by laser cutting and pickling.

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