CN217162843U - Guide wire structure capable of improving operability and insertability - Google Patents

Abstract

A guide wire structure that can improve operability and insertability, comprising a mandrel, a coil body and a resin layer, the coil body is coiled in a spiral shape, and an inner cavity is formed inside the coil body; the base end of the coil body is fixedly connected with the front end of the mandrel ; The resin layer covers the outer surface of the mandrel, and extends into the inner cavity of the coil body from the place where the coil body and the resin layer meet and extends to the front end of the coil body. The coil body at the front end of the mandrel is tied by the coil restraint wire, which has strong flexibility. Even if a resin layer is wrapped around the coil restraint wire, the overall stiffness is lower than that of the front end of the existing guide wire. Therefore, it can be used. The flexibility of the front end of the guide wire is greatly improved, which is beneficial for the guide wire to enter into complex branched or narrow blood vessels or relatively twisted blood vessels, thereby improving the insertability of the guide wire. In addition, the resin layer of the present invention is not entirely arranged on the outer surface of the full length of the guide wire, but extends from the outer surface of the mandrel to the coil body, which can reduce the frictional resistance of the mandrel, and can improve the operability and performance of the guide wire. Insertivity.

Description

Guide wire structure for improved maneuverability and insertability

【Technical field】

The utility model relates to medical instruments, in particular to a guide wire structure which can improve operability and insertability.

【Background technique】

In interventional procedures, catheter assemblies are often required. A catheter assembly typically includes a catheter and a guidewire. The guide wire is slender and has a small diameter and can be inserted into the patient's blood vessel; the catheter is slender and tubular, and can be sheathed outside the guide wire. During operation, a guide wire is usually used for guidance, and the front end of the guide wire is advanced along the blood vessel by manipulating the guide wire to reach the target site. Existing guidewires are flexible over their entire length so that they can bend to advance in a blood vessel; over shorter lengths, the guidewire material is generally rigid and malleable. When in use, the front end of the guide wire is usually bent into a desired shape according to the characteristics of the blood vessel of the target site, such as a J shape, and then the guide wire is placed in the blood vessel, and the guide wire is continuously advanced along the blood vessel through the operation. destination site. This kind of guide wire is easy to operate and advance because of its certain hardness. When it is used in large blood vessels, it can reach the target site relatively easily because of its shapeable front end. However, in practice, the blood vessels in some target sites are stenotic, which is not conducive to the passage of the guide wire after shaping, while some blood vessels have many branches, which are more curved and have a large turning point. The existing guide wire cannot pass through the turning point at all, and The use of a stiffer guide wire in such a place is also prone to the problem of blood vessel perforation; moreover, during the advancement of the guide wire, the curved shapes of the blood vessels are different in different places, and the shape pre-shaped according to the target site cannot be suitable for other places. Therefore, in actual use, the doctor needs to adjust the direction repeatedly so that the guide wire can enter the target blood vessel. In addition, when the guide wire is advanced, its ability to pass through the blood vessel mainly depends on the front end of the guide wire. The front end of the existing guide wire has high rigidity and insufficient compliance. Therefore, the existing guide wire is faced with complex branches. Or narrow blood vessels or relatively twisted blood vessels, the insertion is more difficult, it takes a long time to reach the target site or it is difficult to reach the target site.

On the other hand, in order to facilitate the guide wire to pass through the blood vessel, usually, the outer surface of the guide wire is covered with a resin layer. In the existing guide wire, the resin layer covers the entire length of the guide wire, which is directly connected by one end of the mandrel. Extending to the front end of the coil body, although this structure can reduce frictional resistance, it will further increase the rigidity of the front end of the guide wire, and will lead to poor rotation performance of the guide wire, thereby reducing the operability of the guide wire.

【Content of utility model】

The utility model aims to solve the above problems, and provides a guide wire structure which can improve the operability and insertability.

In order to solve the above-mentioned problems, the present invention provides a guide wire structure that can improve operability and insertability. An inner cavity is formed; the base end of the coil body is fixedly connected with the front end of the mandrel; the resin layer is covered on the outer surface of the mandrel, and is connected by the coil body and the resin layer. It extends into the inner cavity of the coil body and extends to the front end of the coil body.

Further, the coil body includes a spring coil, a front end restraint portion, a base end restraint portion, a front end protection tip, a base end connection portion and a coil restraint wire, the spring coil is coiled in a spiral shape and can be swung, and the interior of the spring coil forms a the inner cavity; the front end restraint part is arranged at the front end of the spring coil, the base end restraint part is arranged at the base end of the spring coil; the front end protection tip is wrapped outside the front end restraint part; The base end connecting part is wrapped outside the base end restraining part and is connected with the front end of the mandrel; the coil restraining wire is arranged in the inner cavity of the spring coil, and is respectively connected with the front end restraining part, The base end restraint is connected.

Further, the resin layer includes an integrally formed mandrel wrapping part, a wire wrapping part and an inner and outer connecting part, the mandrel wrapping part is wrapped on the outer surface of the mandrel; the wire wrapping part is located in the inner cavity The inner and outer connecting parts are connected between the mandrel wrapping part and the wire wrapping part, and extend from the spring coil to the inner cavity.

Further, a protruding detachment preventing portion is provided on the wire wrapping portion, and the detachment preventing portion is used to prevent the wire wrapping portion from peeling off and falling out of the coil body.

Further, the end of the front-end protection tip is in a circular arc shape.

Further, the front end restraint portion and the base end restraint portion are spherical, and their diameters are larger than the diameter of the inner cavity.

The beneficial contribution of the present invention is that it effectively solves the above problems. The guide wire structure of the present invention, which can improve operability and insertability, is provided with a coil body at the front end of the mandrel, which is easy to swing and constrained by the coil restraining wire. Compared with the existing structure, the coil body is directly wrapped outside the mandrel. In terms of the structure of the guide wire, the coil body of the present application has stronger flexibility, therefore, the rigidity of the front end of the guide wire can be greatly reduced, which facilitates the guide wire to pass through complex branched or narrow blood vessels or relatively twisted blood vessels, thereby improving the guide wire’s durability. Insertivity. In addition, the guide wire structure of the present invention, which can improve operability and insertability, is covered with a resin layer on the outside of the mandrel, and the resin layer extends from the outside of the mandrel to the coil body and covers the coil restraining wire. The friction resistance of the outer surface of the mandrel can be reduced to facilitate passage in the blood vessel, and on the other hand, the rotation performance of the spring coil is not affected, thereby improving the operability of the existing guide wire. In addition, the front end of the resin layer is located in the coil body, and even if the resin layer is peeled off and everted, it is difficult to come out of the coil body, so that the use performance of the guide wire is not affected. The guide wire structure of the utility model, which can improve operability and insertability, has the characteristics of novel structure and practical function, and has strong practicability.

【Description of drawings】

FIG. 1 is a schematic diagram of the principle structure of the present invention.

Reference signs: mandrel 10, coil body 20, spring coil 21, front end restraint part 22, base end restraint part 23, front end protection tip 24, base end connection part 25, coil restraint wire 26, inner cavity 27, resin layer 30. The mandrel wrapping part 31, the wire wrapping part 32, the inner and outer connecting part 33, and the anti-falling part 34.

【Detailed ways】

The following examples are further explanations and supplements to the present utility model, and do not constitute any limitation to the present utility model.

As shown in FIG. 1 , the guide wire structure that can improve operability and insertability of the present invention includes a mandrel 10 , a coil body 20 and a resin layer 30 . The coil body 20 is connected to the front end of the mandrel 10 and has strong flexibility, which is used to reduce the rigidity of the front end of the guide wire to improve the insertability of the guide wire. The resin layer 30 wraps around the mandrel 10 and wraps around the coil restraining wires 26 in the coil body 20 for reducing frictional resistance and ensuring the rotation performance of the coil body 20 .

The mandrel 10 is an elongated member, which can be made of known materials such as stainless steel alloy, NI-TI alloy and the like. In this embodiment, the mandrel 10 is preferably made of stainless steel. The length of the mandrel 10 is not limited, and its outer diameter can be set as required. Normally, the outer diameter of the mandrel 10 can be set to 0.1mm-1.0mm. For the shape of the mandrel 10, reference may be made to the known technology, which is not limited in this embodiment. For example, the mandrel 10 may be an elongated member having a constant outer diameter, or may be an elongated member whose outer diameter gradually decreases from the proximal end side to the distal end side.

The coil body 20 is disposed at the front end of the mandrel 10 , which is a structure that preferentially enters the patient's body during an interventional operation. The coil body 20 is fixedly connected with the mandrel 10 and can be pushed forward by the mandrel 10 . The coil body 20 is more flexible than the mandrel 10 , and is easy to swing, and can advance along the direction of blood flow without external force intervention.

As shown in FIG. 1 , the coil body 20 includes a spring coil 21 , a front end restraint portion 22 , a base end restraint portion 23 , a front end guard tip 24 , a base end connection portion 25 , and a coil restraint wire 26 .

As shown in FIG. 1 , the spring coil 21 is coiled in a helical shape, and an inner cavity 27 extending in the axial direction is formed inside the spring coil 21 . Since the spring coil 21 is a helical structure, it is easy to swing. The spring coil 21 is formed by winding a platinum wire with a very thin diameter. The diameter of the platinum wire is about 0.001 inches to 0.004 inches, and the outer diameter of the coiled helical structure is the same as the outer diameter of the front end of the mandrel 10 , which is more convenient for interventional operations. The pitch of the spring coil 21 may be uniform, or may vary along the length of the spring coil 21, or different segments may have different pitches, which may be set as required, and this embodiment does not limit.

As shown in FIG. 1 , the front end restraint portion 22 and the base end restraint portion 23 are provided at both ends of the spring coil 21 , which are used to restrain the two ends of the spring coil 21 and prevent the spring coil 21 from being scattered and having no shape. The front end restraining portion 22 is disposed at the front end of the spring coil 21 and is located outside the spring coil 21 . The base end restraining portion 23 is provided at the base end of the spring coil 21 and is located outside the spring coil 21 . In this embodiment, the front end restraint portion 22 and the base end restraint portion 23 are both spherical, and their diameters are larger than the diameter of the inner cavity 27 , so they cannot enter the inner cavity 27 of the spring coil 21 , but can only reach the inner cavity 27 of the spring coil 21 . outside both ends of the spring coil 21 . The materials of the front end restraint portion 22 and the base end restraint portion 23 may not be limited, because they are finally wrapped in the front end protection tip portion 24 and the base end connection portion 25 . In this embodiment, the front end restraint portion 22 and the base end restraint portion 23 are made of polymer material, which can reduce the weight of the coil body 20 compared with metal materials, thereby facilitating the coil body 20 to swing.

As shown in FIG. 1 , the front end protection tip 24 is provided at the front end of the spring coil 21 , which wraps around the front end restraining portion 22 and forms a fixed connection with the front end of the spring coil 21 . The front guard tip 24 has a pointed structure, thus facilitating insertion. In this embodiment, the end of the front-end protection tip 24 is in the shape of an arc, which can not only facilitate insertion, but also avoid damage to the blood vessel wall during use. The front guard tip 24 may be made of a suitable polymeric material, such as low density polyethylene, acrylic adhesive, or the like. The front end protection tip portion 24 can be covered and formed outside the front end restraint portion 22 through a process such as molding, so as to completely enclose the front end restraint portion 22 therein.

As shown in FIG. 1 , the base end connecting portion 25 is provided at the base end of the spring coil 21 , is wrapped around the outside of the base end restraining portion 23 , and is connected to the base end of the spring coil 21 and the mandrel. The front end of 10 forms a fixed connection. In other words, the base end connecting portion 25 is used to connect the spring coil 21 and the mandrel 10 . The shape of the base end connecting portion 25 can be set as required, and preferably, the connection portion between the base end connecting portion 25 and the mandrel 10 and the spring coil 21 should be smoothly transitioned to facilitate insertion. The base end connecting portion 25 can be made of platinum, titanium, stainless steel and other materials.

As shown in FIG. 1 , the coil restraint wire 26 is arranged in the inner cavity 27 of the spring coil 21 and is connected to the front end restraint portion 22 and the base end restraint portion 23 respectively. The coil restraint wire 26 can tighten the front end restraint portion 22 and the base end restraint portion 23, thereby restraining the spring coil 21, so that the spring coil 21 maintains the helical shape so as not to be accidentally loosened during use. The coil restraint wire 26 is stretch-resistant and can be made from a polymeric material such as polyethylene, polypropylene, and the like. The coil restraint wire 26 can be connected to the front end restraint portion 22 and the base end restraint portion 23 by knotting. For example, holes can be made on the front end restraint portion 22 and the base end restraint portion 23, and then the coil restraint wire 26 can be passed through the corresponding holes and knotted, so as to be tensioned between the front end restraint portion 22 and the base end restraint portion 23. between. When the spring coil 21 is in a straight state, the coil restraining wire 26 coincides with the central axis of the spring coil 21 .

Since the spring coil 21 of the coil body 20 is tied by the flexible coil restraining wire 26, it is more flexible than the structure of the coil body 20 at the front end of the existing guide wire, which is more conducive to swing and follow the blood flow. The flow direction is directed into vessels with complex or narrow branches or more tortuous vessels, thereby improving the insertability of the guidewire.

The resin layer 30 covers the outer surface of the mandrel 10 and extends into the inner cavity 27 of the coil body 20 from the place where the coil body 20 is connected with the resin layer 30 to extend to the coil the front end of the body 20 . The resin layer 30 can reduce frictional resistance and facilitate the passage of the guide wire in the blood vessel. The resin layer 30 is made of resin material, and includes a mandrel wrapping portion 31 , a wire wrapping portion 32 , and an inner and outer connecting portion 33 that are integrally formed.

The mandrel wrapping portion 31 covers the outer surface of the mandrel 10 , and its length is equivalent to the length of the mandrel 10 , and it covers the entire length of the mandrel 10 . The thickness of the mandrel wrapping portion 31 can be set as required, which is not limited in this embodiment.

The wire wrapping portion 32 is located in the inner cavity 27 and wraps on the coil restraining wire 26 . In some embodiments, the length of the wire wrap 32 is comparable to the length of the coil restraint wire 26 , which spans the entire length of the coil restraint wire 26 . In this embodiment, the length of the wire wrapping portion 32 is slightly smaller than the length of the coil restraint wire 26 , one end of the wire wrapping portion 32 is separated from the base end restraint portion 23 by a certain distance, and the other end is connected to the front end restraint portion 22 . . The thickness of the wire wrapping portion 32 can be set as required, which can be consistent with the thickness of the mandrel wrapping portion 31 , and can also be inconsistent with the thickness of the mandrel wrapping portion 31 .

The inner and outer connecting portion 33 is connected between the mandrel wrapping portion 31 and the wire wrapping portion 32 , and extends from the spring coil 21 to the inner cavity 27 to be connected to the wire wrapping portion 32 . The shape of the inner and outer connecting portions 33 is not limited, and in this embodiment, it is in the shape of a cone. Since the spring coil 21 is spirally wound by platinum wire, the inner and outer connecting portions 33 can pass through the gap of the spring coil 21 and extend from the outside of the spring coil 21 to the inside of the spring coil 21 .

Further, in order to prevent the wire wrapping portion 32 from peeling off and everting during use and affecting the insertability of the front end of the guide wire, the wire wrapping portion 32 is provided with a protruding anti-detachment portion 34 . The detachment prevention portion 34 is protruding relative to the wire wrapping portion 32 , and its specific shape is not limited, and it may be hemispherical or any shape. There may be one or a plurality of the preventing parts 34 . The anti-falling parts 34 may be symmetrically arranged or asymmetrically arranged. The size, position and shape of the slip-off preventing portion 34 are not limited, and can be set as required. When the wire wrapping portion 32 is accidentally peeled off and turned outward, the anti-dropping portion 34 can be hooked on the inner side of the spring coil 21, thereby preventing the everted wire wrapping layer from slipping out of the gap of the spring coil 21, thereby not affecting or Greatly reduces the impact on the front end of the guide wire.

Thus, the guide wire structure of the present invention that can improve operability and insertability is formed: the coil body 20 at the front end of the mandrel 10 is tied by the coil restraining wire 26, which has strong flexibility, even when the coil restrains the wire 26 is wrapped with a layer of resin layer 30, and its overall stiffness is also lower than that of the front end of the existing guide wire. Therefore, it can greatly improve the flexibility of the front end of the guide wire, which is beneficial for the guide wire to enter into complex branched or narrow blood vessels or relatively twisted blood vessels , thereby improving the insertability of the guide wire. In addition, the resin layer 30 of the present invention is not entirely arranged on the outer surface of the full length of the guide wire, but extends from the outer surface of the mandrel 10 to the inside of the coil body 20, which can reduce the frictional resistance of the mandrel 10, which is beneficial for the guide wire in the coil body 20. It can pass through the blood vessel without affecting the performance of the coil body 20 at the leading end of the guide wire, so that the operability and insertability of the guide wire can be improved. The guide wire structure of the utility model, which can improve operability and insertability, has the characteristics of novel structure and practical function, and has strong practicability.

Although the present utility model is disclosed through the above embodiments, the scope of the present utility model is not limited thereto. Without departing from the concept of the present utility model, the above components can be formed by similar or equivalent elements known to those skilled in the art. replace.

Claims (6)

1. A guide wire structure capable of improving operability and insertability, characterized in that it comprises: mandrel (10); The coil body (20) is coiled in a spiral shape, and an inner cavity (27) is formed inside; the base end of the coil body (20) is fixedly connected with the front end of the mandrel (10); A resin layer (30) covers the outer surface of the mandrel (10), and extends into the coil body (20) from the place where the coil body (20) is connected to the resin layer (30) The cavity (27) extends to the front end of the coil body (20). 2. The guide wire structure capable of improving operability and insertability according to claim 1, wherein the coil body (20) comprises: a spring coil (21), which is coiled in a spiral shape and can swing, and the inner cavity (27) is formed in its interior; A front end restraining part (22) is arranged at the front end of the spring coil (21), The base end restraining part (23) is arranged on the base end of the spring coil (21); a front-end protective tip portion (24), which is wrapped outside the front-end restraint portion (22); a base end connecting part (25), wrapped around the base end restraining part (23), and connected to the front end of the mandrel (10); The coil restraint wire (26) is arranged in the inner cavity (27) of the spring coil (21), and is respectively connected to the front end restraint part (22) and the base end restraint part (23). 3. The guide wire structure capable of improving operability and insertability according to claim 2, wherein the resin layer (30) comprises an integrally formed: The mandrel wrapping part (31) is wrapped on the outer surface of the mandrel (10); a wire wrapping part (32), located in the inner cavity (27), and wrapping on the coil restraining wire (26); The inner and outer connecting parts (33) are connected between the mandrel wrapping part (31) and the wire wrapping part (32), and extend from the spring coil (21) to the inner cavity (27). 4. The guide wire structure capable of improving operability and insertability according to claim 3, characterized in that a protruding anti-dropping portion (34) is provided on the wire wrapping portion (32), so that The detachment prevention part (34) is used to prevent the wire wrapping part (32) from peeling off and detaching from the coil body (20). 5. The guide wire structure capable of improving operability and insertability according to claim 4, characterized in that the end of the front end protection tip (24) is arc-shaped. 6. The guide wire structure capable of improving operability and insertability according to claim 5, characterized in that the front end restraining portion (22) and the proximal end restraining portion (23) are spherical, and their diameters are larger than the inner diameter of the inner The diameter of the cavity (27).

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