CN217339713U - Medical catheter with composite property - Google Patents

Abstract

The utility model discloses a medical catheter with composite property, which comprises a catheter body, wherein the catheter body comprises a polymer outer layer, a metal reinforced layer and a polymer inner layer, the metal reinforcing layer comprises at least one section of metal composite woven mesh, the metal composite woven mesh is formed by weaving round wires and flat wires together, the metal composite woven mesh provided by the utility model adopts the structural design of mixed weaving of special-shaped metal wires, namely the round wires and the flat wires, but also comprises single-strand weaving and double-strand weaving, so that the metal reinforcing layer section and the catheter section where the metal composite weaving net is positioned have composite properties and comprehensive properties which cannot be achieved by a full-round wire or full-flat wire weaving structure, and a catheter product with unique performance which cannot be achieved by conventional regulation is obtained, the interventional catheter meets specific use requirements, is suitable for special application scenes, widens the application range of the interventional catheter and has higher medical value.

Description

Medical catheter with composite property

Technical Field

The utility model relates to the field of medical equipment, in particular to a medical catheter with composite property.

Background

The medical catheter is a general term for lumen products communicating the inside and outside of a human body and can be made of different materials such as metal, plastic, rubber and the like. The present invention is widely used as a passage for an interventional operation, drainage, medication, blood transfer, and other medical instruments. Conventional interventional catheters are relatively soft textured plastics. In operation, if some blood vessels are bent and have narrow lumens, the conventional catheter is difficult to push into a far-end blood vessel, the near end and the middle section of the catheter are bent and even broken, or the far end of the catheter is knotted, which are caused by low axial and radial mechanical properties of the plastic catheter. However, if a hard catheter is used, the vessel, tissue or cells may be damaged.

In recent years, a catheter with a metal reinforcing layer is successfully used for various interventional treatments. The core structure is that the metal spring ring or/and the woven net with high mechanical performance are embedded into the plastic pipe, that is, the ring-shaped structure of the metal spring ring or/and the net-shaped structure of the woven net are used as the interlayer of the plastic pipe. Under the condition of the same wall thickness, the axial and radial mechanical properties of the pipe with the metal reinforcing layer are improved compared with the common plastic pipe. The good axial mechanical property improves the tensile resistance of the catheter, and the good radial mechanical property improves the bending resistance of the catheter.

Similarly, such catheters have good flexibility, generally have poor axial stretch resistance and poor durability, and once the distal end of the catheter is campton in a tortuous vessel, the catheter with poor stretch resistance is easy to stretch and deform during retraction, which results in failure of the operation. However, the materials with good stretch resistance and durability are generally poor in elasticity and not flexible enough, so that the catheter is difficult to pass through tortuous vessels, and interventional therapy cannot be realized. In addition, the mechanical properties of interventional catheters are not uniform throughout the body, but rather are piecewise desirable, generally with increased proximal-to-distal flexibility and reduced support on the catheter.

Except the influence of the inner layer and the outer layer of the polymer, the mechanical property of the interventional catheter is mainly determined by the mechanical property of the metal reinforcing layer, so the size, the material and the weaving or/and winding mode of the metal wires in the metal reinforcing layer are adjusted conventionally, and the obtained catheter sample is tested experimentally to obtain various catheter products with different mechanical properties meeting various different use requirements.

The method is designed based on the scheme, sample manufacturing and experimental detection based on the mixed weaving of different shapes (namely round wires and flat wires) of metal wires, and a catheter product which cannot be adjusted conventionally and has unique performance is obtained to meet specific use requirements and adapt to special application scenes.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a medical catheter with composite property.

In order to achieve the above object, the technical solution of the present invention is: the utility model provides a medical catheter with combined property, contains the pipe shaft, the pipe shaft contains polymer overcoat, metal enhancement layer and polymer inlayer, the metal enhancement layer is individual layer or multilayer structure, and every layer comprises single section metal mesh grid or metal spring ring, or is formed by connecting multistage metal mesh grid and/or metal spring ring, the metal enhancement layer contains the compound mesh grid of at least one section metal, the compound mesh grid of weaving of metal is woven jointly by circle silk and band wire and is formed.

Preferably, the metal composite woven mesh has a single-strand woven structure of 1 round wire × 1 flat wire.

Preferably, the round wire and the flat wire are respectively one of a stainless steel wire, a nickel-titanium alloy wire and a cobalt-chromium alloy wire.

Preferably, the metal composite woven mesh is a double-strand woven structure of 1 round wire parallel to 1 flat wire × 1 round wire parallel to 1 flat wire, 1 round wire parallel to 1 flat wire × 2 parallel to round wire, 1 round wire parallel to 1 flat wire × 2 parallel to flat wire, or 2 parallel round wire × 2 parallel to flat wire.

Preferably, the round wire and the flat wire are respectively one or more of stainless steel wire, nickel-titanium alloy wire and cobalt-chromium alloy wire.

Preferably, the metal composite woven mesh has a varying weave density in the axial direction.

Preferably, the metal composite woven mesh has a uniform weaving density in the axial direction.

Preferably, the metal reinforcing layer comprises at least two sections of metal composite woven meshes with different weaving densities.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model has the following beneficial effect:

the utility model discloses in the compound braided wire net of metal that proposes adopted special-shaped metal wire to mix the structural design who weaves round wire flat filament promptly, and contain the single strand and weave and double strand weave, can make compound braided wire net place metal strengthen layer section and pipe section possess full round wire or full flat filament and weave the compound property and the comprehensive properties that the structure can't reach, obtain the pipe product that has unique performance that conventional regulation can't reach, in order to satisfy specific operation requirement, adapt to special application scene, the range of application of interveneeing the pipe has been widened, higher medical value has.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment 1 of a composite medical catheter according to the present invention.

Fig. 2 is a schematic structural diagram of an embodiment 2 of a composite medical catheter according to the present invention.

Fig. 3 is a schematic structural diagram of an embodiment 3 of a medical catheter with composite properties according to the present invention.

Fig. 4 is a sectional view taken on a line a-a of fig. 1 at a thick line (another possible sectional view taken by rotating the sectional view by 180 degrees is omitted).

Fig. 5 is a schematic structural view of embodiment 4 of a medical catheter with composite properties according to the present invention.

Fig. 6 is a view of all possible cross-sections taken as thickened on the section line B-B in fig. 5 (omitting the other possible cross-sections taken by rotating the cross-sections by 180 ° each).

Fig. 7 is a schematic structural view of a composite braided metal mesh having a variable braiding density in an axial direction according to example 5 of a composite medical catheter of the present invention.

In the figure: 1. a tube body; 2. an outer polymer layer; 3. a metal reinforcing layer; 4. an inner polymer layer; 5. a metal mesh grid; 6. a metal spring ring; 7. a metal composite mesh grid; 8. round wire; 9. and (4) flattening the filaments.

Detailed Description

The following detailed description is made in conjunction with specific embodiments of the present invention:

the utility model relates to a medical catheter with combined property, especially, be used for stretching into the cardiovascular intervention treatment, contain pipe shaft 1, pipe shaft 1 contains polymer outer 2, metal enhancement layer 3 and polymer inlayer 4, metal enhancement layer 3 is individual layer or multilayer structure, every layer comprises single section metal mesh grid 5 or metal spring coil 6, or is formed by connecting multistage metal mesh grid 5 and/or metal spring coil 6, metal enhancement layer 3 contains at least one section metal composite mesh grid 7, metal composite mesh grid 7 is a special metal mesh grid 5 who is woven together and is formed by circle silk 8 and band silk 9.

As shown in fig. 1, in example 1, the metal reinforcing layer 3 has a single-layer structure and is formed of a single-piece woven metal mesh 5, and the woven metal mesh 5 is a composite woven metal mesh 7 having a single-piece woven structure of 1 round wire 8 × 1 flat wire 9.

As shown in fig. 2, in example 2, the metal reinforcing layer 3 has a single-layer structure and is formed by connecting a single-section metal woven mesh 5 and a single-section metal spring coil 6, and the metal woven mesh 5 is a metal composite woven mesh 7 having a single-layer woven structure of 1 round wire 8 × 1 flat wire 9.

As shown in fig. 3, in example 3, the metal reinforcing layer 3 has a double-layer structure, and is formed by winding the metal coil 6 of the outer layer around the metal mesh grid 5 of the inner layer, and the metal mesh grid 5 is a metal composite mesh grid 7 having a single-strand woven structure of 1 round wire 8 × 1 flat wire 9.

As shown in fig. 4, example 1 includes the cross of the single-strand mixed braid of the flat filaments 9 of the round filaments 8 of example 2 and example 3, and the flat filaments of the round filaments are arranged above and below each other, and thus has mechanical properties different from those of the full flat filaments 9 braid and the full round filaments 8 braid.

In embodiment 123 and contain the compound braided wire of structure metal net 7 that weaves of round wire 8 flat wire 9 single strand the utility model discloses an among other technical scheme, round wire 8 and flat wire 9 are one of stainless steel wire, nickel titanium alloy silk and cobalt chromium alloy silk respectively, and the independent assortment is selected to round wire 8 and flat wire 9 material promptly, and both can be heterogeneous material also can be the same kind of material.

As shown in fig. 5, in example 4, the metal reinforcing layer 3 has a single-layer structure and is formed by a single-segment metal woven mesh 5, and the metal woven mesh 5 is a metal composite woven mesh 7 having a structure of 1 round wire 8 parallel to 1 flat wire 9 × 2 parallel to round wire 8, 1 round wire 8 parallel to 1 flat wire 9 × 2 parallel to flat wire 9, or 2 parallel to round wire 8 × 2 parallel to flat wire 9 double-strand woven structure, and four different double-strand woven patterns are respectively one-to-one corresponding to a (including a1 and a2) bcd in fig. 6.

In embodiment 4 and contain 8 flat wires of circle silk 9 double-strand mixed braiding structure metal composite braiding net 7 among the other technical scheme of the utility model, circle silk 8 and flat wire 9 are one in stainless steel wire, nickel titanium alloy silk and the cobalt chromium alloy silk respectively, circle silk 8 and flat wire 9 material selection independent assortment promptly, both can be that the xenogenesis material also can be the same kind of material, also can be the xenogenesis material between many circle silks 8 or between many flat wires 9, in addition, in order to guarantee that the metal composite braiding net 7 of two-strand braided structure can be worked out smoothly and have homogeneous thickness and level and smooth outward appearance, two parallel metal wires of same strand must have same thickness and/or diameter.

The utility model discloses an among other technical scheme, the quantity of metal composite woven mesh 7, distribute and the combination is all unrestricted, metal composite woven mesh 7 can be single also can be a plurality ofly, a plurality of metal composite woven mesh 7 can distribute interconnect and/or indirect connection in single layer structure's metal enhancement layer 3, also can freely distribute in multilayer structure's metal enhancement layer 3, a plurality of metal composite woven mesh 7 can be all single strand woven structure, can be all double-strand woven structure, also can both contain.

As shown in fig. 7, the metal composite mesh grid 7 has a variable weaving density in the axial direction, and at this time, the variation and control of the mechanical properties (i.e., the mechanical properties of the conduit) of the metal reinforcement layer 3 of the metal composite mesh grid 7 based on the round wire 8 and flat wire 9 hybrid weaving structure can be realized only by one section of the metal composite mesh grid 7.

When the metal composite mesh grid 7 has uniform weaving density in the axial direction and the metal reinforcing layer 3 comprises at least two sections of metal composite mesh grids 7 with different weaving densities, the metal composite mesh grids 7 with different weaving densities in multiple sections also realize the change and control of the mechanical property (namely the mechanical property of the conduit) of the metal reinforcing layer 3 of the metal composite mesh grid 7 based on the round wire 8 and flat wire 9 mixed weaving structure, but the mechanical property of each section of metal composite mesh grid 7 on the metal reinforcing layer 3 (namely the conduit section) is relatively uniform.

The mechanical property of the metal composite mesh grid 7 or the metal reinforcing layer 3 or the conduit can be a specified single mechanical property or a comprehensive mechanical property.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (8)

1. A medical catheter with composite property comprises a catheter body (1), wherein the catheter body (1) comprises a polymer outer layer (2), a metal reinforcing layer (3) and a polymer inner layer (4), the metal reinforcing layer (3) is of a single-layer or multi-layer structure, each layer is formed by connecting a single-section metal woven mesh (5) or a metal spring ring (6) or formed by connecting a plurality of sections of metal woven meshes (5) and/or metal spring rings (6), and the medical catheter is characterized in that: the metal reinforcing layer (3) comprises at least one section of metal composite woven mesh (7), and the metal composite woven mesh (7) is formed by jointly weaving round wires (8) and flat wires (9).

2. A medical catheter having composite properties according to claim 1, wherein: the metal composite woven net (7) is in a single-strand woven structure of 1 round wire (8) multiplied by 1 flat wire (9).

3. A medical catheter having composite properties according to claim 2, wherein: the round wire (8) and the flat wire (9) are respectively one of a stainless steel wire, a nickel-titanium alloy wire and a cobalt-chromium alloy wire.

4. A medical catheter having composite properties according to claim 1, wherein: the metal composite woven mesh (7) is a double-strand woven structure of 1 round wire (8) parallel 1 flat wire (9) × 1 round wire (8) parallel 1 flat wire (9), or 1 round wire (8) parallel 1 flat wire (9) × 2 parallel round wire (8), or 1 round wire (8) parallel 1 flat wire (9) × 2 parallel flat wire (9), or 2 parallel round wire (8) × 2 parallel flat wire (9).

5. A medical catheter having composite properties according to claim 4, wherein: the round wire (8) and the flat wire (9) are respectively one or more of stainless steel wires, nickel-titanium alloy wires and cobalt-chromium alloy wires.

6. A medical catheter having composite properties according to any of claims 2 or 4, wherein: the metal composite woven mesh (7) has a variable weaving density in the axial direction.

7. A medical catheter having composite properties according to any of claims 2 or 4, wherein: the metal composite woven mesh (7) has uniform weaving density in the axial direction.

8. A medical catheter having composite properties according to claim 7, wherein: the metal reinforcing layer (3) comprises at least two sections of metal composite woven meshes (7) with different weaving densities.

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