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Method for formation of spiral layer inside catheter

A helix and catheter technology, applied in the field of forming the helical layer inside the catheter, can solve the problems of high cost, difficulty in pushing, high friction, etc., and achieve the effect of low cost and increased biological risk and structural risk

Active Publication Date: 2014-08-20
SHANGHAI MICROPORT MEDICAL (GROUP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. When the balloon dilatation catheter is pushed along the guide wire, the catheter tip with a narrow opening (that is, the distal end of the catheter) may be stuck on the discontinuity of the guide wire surface during the push process, resulting in difficulty in pushing;
[0007] 2. During the process of inserting the guide wire into the lesion, when the guide wire head goes out of the catheter opening and enters the lesion, such as a narrow coronary artery, its protruding or discontinuous structure on the surface may increase the propulsion resistance and even damage the vascular tissue causing concurrency issues
[0011] 2. In the bending part, the guide wire may increase the contact with the protrusion, and the friction force will still be large
[0014] 1) The process is complicated and the cost is high;

Method used

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  • Method for formation of spiral layer inside catheter
  • Method for formation of spiral layer inside catheter
  • Method for formation of spiral layer inside catheter

Examples

Experimental program
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Effect test

example 1

[0056] The helical layer wire 1 is made of 304V stainless steel wire with a circular cross section. The pitch of the helical layer wire 1 is 0.2mm, the length of the helical layer wire 1 in the axial direction is 300mm, and the inner diameter of the helical layer is 0.016inch. The outer diameter is 0.020inch. A 0.016 inch mandrel (used as the lining wire 2 ) was threaded into the helically layered wire 1 to obtain a mandrel 4 with helical layers.

[0057] Make a single-chamber, three-layer polymer tubing (as the body of catheter 3) again, length is 250mm, outer diameter is 0.028inch, and inner diameter is 0.021inch, and its inner layer is LDPE (low density polyethylene), and outer layer is Polyamide PA12 with an adhesive layer in the middle;

[0058] The mandrel 4 with the helical layer is penetrated into the above-mentioned single-cavity, three-layer polymer pipe, and the polymer pipe is coated on the mandrel 4 with the helical layer by hot extrusion;

[0059] The mandrel 4...

example 2

[0061] Use Nitinol material, trapezoidal cross-section (the length of the upper bottom is 0.05mm, the length of the lower bottom is 0.15mm, and the height is 0.05mm) to make the helical layer wire 1, the pitch of the helical layer wire 1 is 0.2mm, and the helical layer wire 1 is on the shaft The upward length is 300mm, the inner diameter of the helical layer is 0.016inch, and the outer diameter of the helical layer is 0.020inch. A 0.016 inch mandrel (used as the lining wire 2 ) was threaded into the helically layered wire 1 to obtain a mandrel 4 with helical layers.

[0062] First make a single-chamber, three-layer polymer tubing (used as the main body of the catheter 3), the length is 250mm, the outer diameter is 0.028inch, the inner diameter is 0.021inch, its inner layer is PTFE (polytetrafluoroethylene), and the outer layer is Polyamide PA12 with an adhesive layer in the middle;

[0063] The mandrel 4 with the helical layer is penetrated into the above-mentioned single-cav...

example 3

[0066] Adopt 304V stainless steel, make the mandrel 4 that length is 300mm with helical layer by micro-engraving, the section of the helical layer of mandrel 4 is equilateral triangle (side length is 0.05mm), the pitch of the helical layer of mandrel 4 is 0.05mm, The inner diameter d of the helical layer is 0.016inch, and the outer diameter D of the helical layer is 0.020inch. A PTFE coating is coated on the surface of the mandrel 4 with the helical layer, and the thickness of the coating is 2 μm.

[0067] First make a single-lumen, three-layer polymer pipe (used as the body of the catheter 3), the length is 250mm, the outer diameter is 0.028inch, and the inner diameter is 0.021inch. The inner layer is PTFE, the outer layer is polyamide PA12, and the middle is adhesive layer;

[0068] The mandrel 4 with the helical layer is penetrated into the above-mentioned single-cavity, three-layer polymer pipe, and the polymer pipe is coated on the mandrel 4 with the helical layer by hot...

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Abstract

A method of forming a spiral layer on the inside of a catheter comprises: preparing a hollow tube-shaped base material to be used as a catheter body; preparing a core shaft, the outer surface of said core shaft being provided with a spiral layer, the material of the outer surface being offset from the material of the hollow tube-shaped base material, and the size of said spiral layer being designed such that the outer diameter of the spiral of said spiral layer is less than or equal to the inner diameter of the hollow tube-shaped base material; inserting the core shaft into the inside of the hollow tube-shaped based material; by means of heating, sleeving the hollow tube-shaped base material onto the spiral layer of the core shaft such that the depth to which said spiral layer is embedded into said base material is less than or equal to the height of said spiral layer; and extracting the core shaft from the hollow tube-shaped base material, thereby forming a spiral layer on the inside of the hollow tube-shaped base material. Because the core shaft having the spiral layer can be reused, the cost of said invention is low. Moreover, the formation of the spiral layer on the inside of the catheter does not involve other substances and thus does not introduce additional biological or structural risks.

Description

technical field [0001] The invention relates to a method for manufacturing a catheter, in particular to a method for forming a helical layer inside a catheter. Background technique [0002] In the treatment of coronary heart disease with interventional methods, percutaneous transluminal coronary angioplasty (PTCA) combined with stent implantation can enlarge the narrowed coronary artery lumen, increase blood flow, and improve blood supply . [0003] The specific process of coronary stent implantation is briefly as follows: percutaneous puncture of the femoral artery or radial artery, retrograde delivery of angiography guide wire through the aorta to the opening of the coronary artery at the root of the aorta, feeding the angiography catheter along the guide wire, and exiting the guide wire. After the angiography is completed, exit the angiography catheter, then enter the angiography guide wire, enter the guide catheter along the guide wire, exit the angiography guide wire, ...

Claims

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Application Information

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IPC IPC(8): B29C51/00B29L23/00
CPCB29C53/30B29L2031/7542
Inventor 杨海唐智荣罗七一
Owner SHANGHAI MICROPORT MEDICAL (GROUP) CO LTD
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