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Fast-exchanging and transferring system

A delivery system, rapid technology, applied in medical science, surgery, blood vessels, etc., can solve problems such as stent displacement, and achieve the effect of safe and easy operation

Active Publication Date: 2009-08-05
SHANGHAI MICROPORT MEDICAL (GROUP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the self-expanding stent with good effect is made of nickel-titanium alloy (NiTinol) through laser engraving. In order to improve the flexibility of the stent, an open structure design with fewer connecting rods between the unit segments is adopted. The blood vessel is tortuous, the open stent head may be tilted, or the stent has just been released but not completely attached to the wall. At this time, the inner tube and the soft tip of the TIP hit the stent and cause a very high risk of stent displacement.

Method used

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  • Fast-exchanging and transferring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Rapid Exchange System for Carotid Stent Delivery

[0036] Outer tube: polyimide / elastic PEBAX (polyether amide block copolymer resin) composite tube, stretched to achieve different diameter requirements for the distal and proximal segments through variable diameter stretching: the diameter of the outer sheath tube for the distal segment is 5FRENCH, and the diameter of the proximal segment is 5FRENCH The diameter of the outer sheath is 3FRENCH, the shrinkage of the outer tube is made of PEBAX (polyetheramide block copolymer resin) material and the wall thickness of the shrinkage is controlled to be about 0.08mm, and a guide wire hole is opened at the sudden change of the stent;

[0037] Push rod: soft polyimide / elastic PEBAX (polyetheramide block copolymer resin) composite tube, flared at the end of the bracket, and the hard segment is a wire;

[0038] Inner tube: soft PEBAX (polyether amide block copolymer resin) / PE (polyethylene) composite tube, the diameter...

Embodiment 2

[0040] Example 2: Rapid Exchange System for Delivery of Peripheral Vascular Stent Graft

[0041] Outer tube: distal PEBAX (polyetheramide block copolymer resin) / PTFE (polytetrafluoroethylene) composite material, diameter 6FRENCH, necking is soft PEBAX (polyetheramide block copolymer resin), shrinkage is controlled The wall thickness of the mouth is not more than 0.1mm, and the proximal section is made of polyimide material, with a diameter of 3FRENCH; the distal section and the proximal section (simultaneously with the inner tube) are glued together;

[0042] Push rod: the soft section is a spiral cut metal hose, and the hard section is a metal wire;

[0043] Inner Tube: Nylon, Urethane End diameter and outer tube shrink fit, but can advance push rod.

[0044] Implementation effect: The supporting force of the covered stent is weak, especially after it is released, it is easy to cause displacement when touched. With the delivery system of this embodiment, after the stent is ...

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Abstract

A high-speed exchanging and delivering system for delivering a self-expansive medical scaffold to the lesion position of blood vessel or cavity and then releasing it is composed of an external sheath tube consisting of a far segment, a near segment with a diameter less than that of said far segment and a diameter changing segment with an opening for leading wire, a push rod consisting of a big-cavity hollow push rod and a push ring in said far segment and a fine push rod for said near segment and fixed to said big-cavity hollow push rod, and an internal tube with smooth conic head and able to slide in said big-cavity hollow push rod.

Description

technical field [0001] The invention relates to a minimally invasive interventional medical device, in particular to an exchange delivery system for delivering and releasing a medical self-expandable stent to a blood vessel or cavity lesion. Background technique [0002] Minimally invasive interventional surgery refers to the use of catheters, stents, lining wires and other interventional devices to complete the treatment of vascular or cavity lesions under the guidance of various imaging equipment. The implementation of minimally invasive interventional therapy depends on various minimally invasive procedures Interventional medical devices. Stents in minimally invasive interventional therapy devices usually include balloon-expandable and self-expandable stents. Self-expandable stents are increasingly used in the treatment of intravascular diseases such as vascular stenosis and hemangioma due to their strong deformation resistance. Interventional therapy, especially for the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/00A61F2/06A61F2/962
Inventor 刘道志郭俊敏赵振心张一杨谦谦
Owner SHANGHAI MICROPORT MEDICAL (GROUP) CO LTD
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