CN115887870A - micro guide wire - Google Patents

Abstract

The application discloses a micro guide wire, which includes a core wire, a developing element sleeved on the outer surface of the distal end of the core wire, and a hypotube sleeved on the distal end of the core wire and the outer surface of the developing element. The hypotube is provided with a filling hole. After the filler is filled, it will generate a force that prevents the relative displacement of the hypotube, the developing element and the core wire; the outer surface of the hypotube is provided with strip-shaped grooves distributed radially along the wave tube, and the strip-shaped grooves are directed toward the distal end of the core wire Gradually densify the distribution. In the embodiment of the present application, the addition of filling holes for the hypotube and the supplementary welding and fixing can effectively enhance the fixation between the hypotube, the core wire and the developing element. It makes the micro-guide wire move more flexibly in the human body but still maintains the stability of its own internal structure, and there will be no escape between the hypotube and the core wire, and it can effectively pass through tissue structures with different degrees of curvature in clinical operations, thereby avoiding Damage to human tissue.

Description

micro guide wire

technical field

The invention relates to the field of medical blood vessel thrombus removal, in particular to vascular interventional surgery, and relates to a medical micro guide wire.

Background technique

With the continuous development of minimally invasive technology, guide wires are increasingly used in the treatment of vascular lesions. The connection method of the micro guide wire determines the biological and mechanical properties of the guide wire. There are two main connection methods, one is cementation, which is connected by a special adhesive, but the stability of the adhesive in contact with the human body needs to be verified, and it is easy to fall off; the other is the connection method of end welding, because the end surface The circular structure of this method is not easy to control the shape of the welding point, and the process is not easy to form. Both over-welding and missing welding will cause stress concentration problems and are easy to break. Therefore, there is a need for a welding structure that can not only solve the problem of the peeling off of the bonding point, but also ensure the uniformity of the soldering point.

Contents of the invention

In order to solve the above technical problems, the embodiment of the present application provides a micro-guide wire, the internal hypotube is fixed on the core wire by a unique welding method and fixed in the axial direction, so that the micro-guide wire can move in the human body It is more flexible, and can effectively pass through tissue structures with different degrees of curvature in clinical operations, thereby avoiding damage to human tissues.

The embodiment of the present application provides a micro-guide wire, which may include: a core wire, a developing element sleeved on the outer surface of the distal end of the core wire, and a hypotube sleeved on the distal end of the core wire and the outer surface of the developing element. The tube is provided with a filling hole; after the filling hole is filled with a filler, a force is generated to prevent the relative displacement of the hypotube, the developing element and the core wire.

Further, the core wire is composed of multiple segments with different end surface sizes, and the diameter of the core wire gradually decreases in the extending direction from the proximal end to the distal end.

Further, the hardness of the distal end of the core wire is smaller than that of the proximal end, so as to improve the bending ability of the distal end of the core wire.

Further, the proximal end and the distal end of the hypotube are provided with the filling holes.

Further, in the filling hole at the proximal end of the hypotube, the filler is filled onto the core wire and fills up the filling hole, so that the core wire and the hypotube are fixed at the proximal end.

Further, in the filling hole at the distal end of the hypotube, the filler is filled in the developing element so that the developing element and the core wire are fixed, and the filler fills the filling hole so that the distal end of the hypotube is fixed on the On the structure formed by the developing element and the core wire.

Further, the filling hole is filled with laser welding wire.

Further, the outer surface of the hypotube is provided with strip-shaped grooves that open radially along the wave tube; in the extending direction from the far end of the seawave tube to the proximal end of the hypotube, the strip-shaped grooves are dislocated and adjacent strips The distance between the grooves gradually decreases.

Further, the distal end of the core wire is coated with colloid to form a distal thermal glue head with a smooth outer surface; during the coating process, the distal thermal glue head adheres and fixes the part of the developing element to the core wire.

Further, the distal hot glue head adheres to the distal surface of the hypotube and transitions smoothly.

In the embodiment of this application, the core wire of the micro guide wire, the cylindrical surface of the distal hot glue head, the development spring and the hypotube are fixed in a unique way, and the axial fixing scheme is used to fix the hypotube and the core wire. Enhanced, the micro-guidewire moves more flexibly in the human body, and can effectively pass through tissue structures with different degrees of curvature in clinical operations, thereby avoiding damage to human tissue.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the overall structure of the micro guide wire provided by the embodiment of the present application;

Fig. 2 is a partial cross-sectional view of the hypotube provided by the embodiment of the present application;

Fig. 3 is a schematic diagram of a proximal welding structure provided by an embodiment of the present application;

Fig. 4 is a schematic diagram of the distal welding structure provided by the embodiment of the present application;

The meanings of reference signs in the figure: 10-core wire, 20-developing element, 30-hypotube, 31-strip groove, 41-proximal thermal glue tip, 42-distal thermal glue tip, 50-filling hole .

Detailed ways

In order to make the purpose, features, and advantages of the application more obvious and understandable, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the following The described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer" etc. Orientation or positional relationship is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

This application relates to a micro-guide wire in medical blood vessel thrombectomy. The core wire 10 of the micro-guide wire is thinner at the distal end to enhance flexibility, and thicker at the proximal end so as to be pushed into the human blood vessel under effective force. The external hypotube 30 itself With transmission and passability, this feature makes guidewire movement more flexible.

As shown in FIG. 1 , the complete structure of the micro guide wire of the present application includes a proximal thermal glue tip 41 , a core wire 10 , a hypotube 30 , a developing spring, and a distal thermal glue tip 42 . The end close to the operator's operation is recorded as the proximal end, and the end away from the operator's operation is recorded as the far end.

The whole core wire 10, as the main structure of the micro-guide wire, is composed of multiple structures with different end surface sizes, and the diameter of the whole core wire 10 extends from the proximal end to the distal end in a gradually decreasing trend, so that the formed core wire 10 is near The cross-sectional size of the end is larger, the core wire 10 is harder, and the end surface of the core wire 10 near the far end is smaller in size and hardness. In this way, damage to human tissue can be avoided, and the proximal core wire 10 can also have sufficient supporting force to push the distal core wire 10 to approach the lesion along the blood vessel. Such a structure can effectively push the guide wire forward along the human blood vessel, and the outer sea The wave tube 30 itself has transmission and passability, which makes the movement of the guide wire more flexible. The medical staff inserts the human blood vessel by holding the sheath at a certain angle. When the sheath is connected with the human blood vessel, the thinner end of the hand-held guide wire is pushed into the human blood vessel from the hole of the sheath along the sheath tube, and passes through the micro guide wire. The imaging design judges the relative position of the guide wire and the human lesion until the front end of the guide wire reaches the lesion, and then pushes the catheter sheath along the micro guide wire to the human lesion for subsequent operations.

The near end and the far end of the whole core wire 10 all use hot glue to form hot glue heads as the protective ends of the two ends of the core wire 10, wherein the proximal hot glue head 41 is connected to one end of the larger section of the core wire 10, and the far end hot glue head 42 Connecting the end of the smaller cross-section of the core wire 10 , the proximal thermal glue head 41 transitions smoothly with the extension of the core wire 10 , and the distal thermal glue head 42 transitions smoothly with the outer end surface of the hypotube 30 .

The developing element 20 is sleeved on the surface of the distal end of the core wire 10 and adhered by hot glue. The developing function of the developing element 20 is beneficial to judge the relative position between the micro guide wire and the lesion in clinical operation.

As a specific embodiment, the developing element 20 adopts a spring coated with a developing coating on the surface, and the elastic structure of the spring is conducive to increasing the flexibility of the guide wire and improving the bending ability.

As a specific embodiment, the hypotube 30 is sleeved on the outer surface of the developing element 20 and the outer surface of the core wire 10, specifically, the distal end of the hypotube 30 is sleeved on the outer surface of the developing element 20, and the hypotube 30 is The end surface of the end is adhered to the far-end thermal glue head 42, and since the hypotube 30 must be longer than the developing element 20, the proximal end of the hypotube 30 is sleeved on the outer surface of the core wire 10.

In the present application, both the proximal end and the distal end of the hypotube 30 are perforated from the side to form a through filling hole 50, and after the filler is coated in the filling hole 50, it is connected with the core wire 10 and the developing element in the hypotube 30. 20 forms a fixed structure, and when the hardness of the filler itself is sufficient, it generates a force that prevents the relative displacement of the hypotube 30 , the developing element 20 and the core wire 10 .

As a specific embodiment, as shown in Figure 3, two symmetrical welding holes are opened on the proximal side of the hypotube 30, as shown in Figure 4, one at the far end of the hypotube 30 There are two symmetrical welding holes on the side.

Fix the core wire 10, the developing spring and the hypotube 30 from the welding hole by means of a laser welding machine,

As a specific embodiment, the filling method adopts welding, which is realized by a laser welding machine supplementing wire or using a cylindrical pin welding method.

For example, in FIG. 3 , the welding hole at the proximal end of the hypotube 30 can be directly inserted into a cylindrical pin so that a filler is formed in the welding hole to prevent sliding between the core wire 10 and the hypotube 30 . Another solution is to use laser welding for wire welding, which is relatively fuller and more stable.

In Fig. 4, the embodiment of the welding structure at the far end of the hypotube 30 is also divided into two types. There are two symmetrical welding holes at a certain distance on the end face of the far end, and the embodiment of the welding structure at the far end is also divided into two types: one The first is to axially weld the hypotube 30, the core wire 10, the cylindrical surface of the distal hot glue head 42, and the developing spring through the two welding holes at the distal end described in FIG. After the thermal glue head 42 is formed, the core wire 10 , the developing spring and the hypotube 30 are fixed through the welding hole by a laser welding machine. The other is a welding method in which the core wire 10 , the cylindrical surface of the distal hot glue head 42 and the developing spring are axially fixed through the two welding holes at the distal end as shown in FIG. 4 . The above-mentioned unique welding method can make the solder joints evenly distribute on the surface of the core wire 10, the cylindrical surface of the distal thermal glue head 42, and the developing spring, and increase the core wire 10, the cylindrical surface of the distal thermal glue head 42, and the developing spring. The axial contact surface with the hypotube 30 makes the connection more firm. Since the welding point is inside the hypotube 30, the problem of the solder point falling off is also avoided, and the metal welding has stable material properties and avoids bonding with human tissue , the hypotube 30 itself has flexibility and twistability, and the welding method of the internal contact surface also avoids the stress concentration phenomenon.

As a specific embodiment, the outer surface of the hypotube 30 is provided with bar-shaped grooves 31 that open radially along the coast of the wave tube 30. In the extension direction of the proximal end of 30, the strip-shaped grooves 31 are dislocated and the distance between adjacent strip-shaped grooves 31 is gradually reduced. The strip-shaped grooves 31 themselves can reduce the hardness of the hypotube 30 and facilitate the bending of the hypotube 30. As the diameter of the entire core wire 10 changes, the bending performance of the distal end is required to be higher. Therefore, in this application, the distribution of the distal ends of the bar-shaped grooves 31 is denser so that the bending ability of the hypotube 30 is comparable to that of the distal end. The core wire 10 at the end can be kept consistent.

Preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations (such as quantity, shape, etc.) can be carried out to the technical solutions of the present invention. , position, etc.), these equivalent transformations all belong to the protection of the present invention.

Claims (6)

1. A micro guide wire comprises a core wire, a developing element sleeved on the outer surface of the far end of the core wire and a hypotube sleeved on the far end of the core wire and the outer surface of the developing element, and is characterized in that the hypotube is provided with a filling hole; after the filling hole is filled with the filler, acting force for preventing the relative displacement of the hypotube, the developing element and the core wire is generated.

2. The micro-guidewire of claim 1, wherein the proximal end and the distal end of the hypotube are each provided with the fill hole.

3. The micro-guidewire of claim 1, wherein in the hypotube proximal fill hole, a filler is filled onto the core wire and fills the fill hole such that the core wire and hypotube are proximally secured.

4. The micro-guidewire of claim 1, wherein in the hypotube distal fill hole, a filler is filled within the visualization element to secure between the visualization element and the core wire, the filler filling the fill hole to secure the distal end of the hypotube to the structure formed by the visualization element and the core wire.

5. The micro-guidewire of claim 1, wherein the hypotube outer surface is provided with a strip-shaped groove along a hypotube radial opening; and in the extending direction from the far end of the hypotube to the near end of the hypotube, the strip-shaped grooves are distributed in a staggered mode, and the distance between every two adjacent strip-shaped grooves is gradually reduced.

6. The micro-guidewire of claim 1, wherein the core wire distal end is coated with a colloid to form a distal end thermal glue head having a smooth outer surface; the distal thermal glue head adhesively secures a portion of the developer element to the core wire during the coating process.

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