CN211584832U

CN211584832U - Distal access catheter

Info

Publication number: CN211584832U
Application number: CN201922393327.0U
Authority: CN
Inventors: 余永毅; 范叔奇
Original assignee: Yongyi Alan Yu
Current assignee: Yongyi Alan Yu
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-09-29
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a distal end route pipe, include: the guiding catheter comprises a diamond-shaped braid layer and a spiral coil combined metal inner tube, a polymer outer layer and an inner liner, the close combination of a special braided structure and each layer enables the far-end blood path catheter to have the support property, the folding resistance and the kink resistance, and the axial stretching deformation of the spiral coil in the conveying and withdrawing processes of the catheter can be reduced; the utility model solves the problems that the traditional far-end passage catheter is easy to kink, deform and have poor support performance and can not be conveyed to an expected target lesion part.

Description

Distal access catheter

Technical Field

The utility model belongs to the technical field of medical catheter technique and specifically relates to a distal end route pipe.

Background

In recent years, the treatment mode of the intravascular interventional medical catheter has become the mainstream mode for treating the arterial lesions due to the characteristics of small wound, less complication and quick postoperative recovery. During operation, the access conduit is used for providing a path and a supporting force for a micro-conduit and the like, and is compatible with the operation of various materials so as to reach a target blood vessel position.

The traditional medical catheter is composed of an outer layer of polymer, a single metal braided or spring-wound spiral coil, an inner lining and the like, and due to the problems of the hardness of a catheter body, the braided structure and the like, when the catheter passes through a complex tortuous blood vessel (such as a siphon section and a T-shaped bifurcation), the kink resistance, the supporting property and the bending and bending resistance of the catheter cannot be expected, so that the catheter cannot be conveyed to an expected target lesion, and the expected application of the device is greatly limited.

Disclosure of Invention

To the not enough that exists among the prior art, the utility model provides a distal end route pipe solves above-mentioned easy kink, yielding, support nature poor, can't carry to the problem at anticipated target pathological change position, and the inseparable combination through special structure of weaving and each layer makes distal end route pipe both possess the support nature, possesses folding resistance and anti kink nature again, can also reduce the axial tension deformation of spiral coil at the pipe transport and withdrawal in-process simultaneously. The utility model adopts the technical proposal that:

a distal access catheter, comprising:

the device comprises a guide catheter, a stress buffer part and a luer connector, wherein the near end of the guide catheter is connected with the luer connector, and the far end of the guide catheter is provided with a catheter tip and a developing ring;

the guiding catheter comprises a polymer outer layer positioned outside the metal inner pipe and an inner lining positioned inside the metal inner pipe; the metal inner tube includes a diamond braid positioned outside the helical coil.

The rhombus braid is nested outside the spiral coil.

The density of the diamond braid gradually increases from the proximal end to the distal end of the guide catheter.

The helical density of the helical coil increases from the proximal end to the distal end of the guiding catheter.

The diamond-shaped braided layer adopts a 2 multiplied by 2 braided structure of rectangular flat wires.

The spiral coil is formed by winding a spring by using a round metal wire.

The diamond braid, the spiral coil, the polymer outer layer and the inner liner are tightly combined through rheology.

The polymer outer layer is distributed with nylon, block polyether amide elastomer and polyurethane elastomer with gradually decreased hardness from the near end to the far end.

The lining is made of polytetrafluoroethylene.

The diamond-shaped braided layer and the spiral coil are made of 304 stainless steel wires or nickel-titanium alloy wires.

The utility model has the advantages that: the diamond braid layer is integrally sleeved outside the spiral coil and tightly combined with the polymer outer layer and the inner lining with gradient change in hardness through rheology, so that the distal end access catheter not only has the support performance of the metal inner tube of the diamond braid layer in complex and tortuous blood vessels, but also has the folding resistance and the kinking resistance of the metal inner tube of the spiral coil in tortuous anatomical structures, and meanwhile, the axial tensile deformation of the spiral coil in the catheter conveying and withdrawing processes can be reduced, and the trafficability of the tortuous blood vessels is greatly improved.

Drawings

Fig. 1 is a schematic view of the front view angle of the present invention.

Fig. 2 is a schematic cross-sectional view of a portion of a guide catheter of the present invention.

Detailed Description

The invention is further described with reference to the following specific drawings and examples.

As shown in fig. 1 and 2, an embodiment of the present invention provides a distal end access catheter, which includes a guiding catheter 1, a stress buffer 2, and a luer connector 3, wherein a proximal end 4 of the guiding catheter 1 is connected to the luer connector 3, and a distal end 5 has a catheter tip 6 and a developing ring 7; the guiding catheter 1 comprises a polymer outer layer 11 positioned outside the metal inner tube 10 and an inner lining 12 positioned inside the metal inner tube 10; the metal inner tube 10 comprises a diamond braid 8 located outside the helical coil 9. The diamond-shaped braid 8 is nested outside the helical coil 9 with a density (PPI) that gradually increases from the proximal end 4 to the distal end 5 of the guide catheter 1, so that the distal access catheter possesses the supportive properties of diamond-shaped braided metal inner tubes in complex, tortuous vessels.

The helical line density (PPI) of the helical coil 9 is gradually increased from the proximal end 4 to the distal end 5 of the guiding catheter 1, so that the distal access catheter has the folding resistance and the kinking resistance of the helical coil metal inner tube in a tortuous anatomical structure, and meanwhile, the axial tensile deformation of the helical coil in the catheter conveying and withdrawing process can be reduced, and the trafficability of a tortuous blood vessel is greatly improved.

The diamond braid layer 8 adopts a rectangular flat wire to carry out 2 x 2 braiding structure so as to ensure the stability of the structure.

Preferably, the spiral coil 9 is formed by winding a round metal wire, and the tensile resistance and the kink resistance of the spring winding structure are fully utilized.

The diamond-shaped braid layer 8, the spiral coil 9, the polymer outer layer 11 and the inner liner 12 are tightly combined through rheology, so that the four are formed into a whole, and the actions are synchronous during operation and are not jointed with each other.

The polymer outer layer 11 is distributed with nylon 12 (PA 12), block polyether amide elastomer (PEBAX) and polyurethane elastomer (TPU) with gradually decreased hardness from the near end 4 to the far end 5, so that the far end access catheter still has a certain curvature when moving deeply in a human body, and can further ensure that the far end access catheter reaches a deeper lesion position.

Preferably, the material of the liner 12 is Polytetrafluoroethylene (PTFE), which is a typical medical material, and is non-toxic and harmless to human body.

Preferably, the diamond-shaped braid layer 8 and the helical coil 9 are made of 304 stainless steel wires or nickel-titanium alloy wires, and the 304 stainless steel wires or nickel-titanium alloy wires have good ductility and toughness in metal, so that the far-end access conduit is ensured not to be easily deformed.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A distal access catheter, comprising: the device comprises a guide catheter (1), a stress buffer piece (2) and a luer connector (3), wherein the near end (4) of the guide catheter (1) is connected with the luer connector (3), and the far end (5) is provided with a catheter tip (6) and a developing ring (7); the method is characterized in that:

the guide catheter (1) comprises a polymer outer layer (11) positioned outside the metal inner tube (10) and an inner lining (12) positioned inside the metal inner tube (10); the metal inner tube (10) comprises a diamond-shaped braid (8) located outside the helical coil (9).

2. The distal access catheter of claim 1, wherein the diamond-shaped braid (8) is nested outside the helical coil (9).

3. The distal access catheter of claim 1, wherein the diamond-shaped braid (8) has a density that gradually increases from the proximal end (4) to the distal end (5) of the guide catheter (1).

4. The distal access catheter as defined in claim 1, wherein the helical density of the helical coil (9) increases from the proximal end (4) to the distal end (5) of the guiding catheter (1).

5. The distal access catheter of claim 1, wherein the diamond-shaped braid (8) is braided in a 2 x 2 configuration using rectangular flat wires.

6. The distal access catheter of claim 1, wherein the helical coil (9) is formed from a round wire wound spring.

7. The distal access catheter of claim 1, wherein the diamond braid (8), helical coil (9), polymeric outer layer (11) and inner liner (12) are rheologically tightly bonded.

8. The distal access catheter of claim 1, wherein the liner (12) is polytetrafluoroethylene.

9. The distal access catheter of claim 1, wherein the diamond-shaped braid (8) and helical coil (9) are made of 304 stainless steel wire or nitinol wire.