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a guiding catheter

A catheter and inner tube technology, applied in the field of guiding catheters, can solve problems such as catheter collapse, failure, and inability to enter blood vessels, and achieve the effect of improving the ability to withstand negative pressure and large flow

Active Publication Date: 2019-06-11
PATHFINDER NEUROTECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the current products on the market, due to the collapse of the catheter during the retraction of the balloon, the balloon retraction time is longer, which increases the risk of thrombosis and distal vascular ischemia; due to the hard tip of the catheter, it cannot Access to more distant vessels, leading to failure of some stent or embolization procedures

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]In this embodiment, three developing points are used, which are respectively arranged at the head end and the middle of the balloon, and the material is silver. The material of the outer tube is PEBAX, and the hardness gradually decreases from the proximal end to the distal end, which are 78D, 55D, and 35D respectively. The inner tube adopts three-layer weaving material, the outer layer is made of polyurethane, the middle layer is made of stainless steel winding wire, the wire width is 0.2mm, and the inner layer is PTFE. The internal diameter of the inner tube is 3mm. The section of the liquid passage chamber 5 adopts a crescent shape. The design length of the head end of the catheter is 3mm. After the overall connection of the catheter is completed, the surface of the catheter is coated with a hydrophilic coating, and the hydrophilic material is selected: sodium hyaluronate.

Embodiment 2

[0034] In this embodiment, two development points are used, which are respectively arranged in the middle of the head end and the balloon, and the material is platinum-iridium alloy. The material of the outer tube is PEBAX, and the hardness gradually decreases from the proximal end to the distal end, respectively 72D, 63D, and 40D. The inner tube is made of three layers of braided material, the outer layer is made of polyurethane, the middle layer is made of stainless steel winding wire, the wire width is 0.15mm, and the inner layer is FEP. The inner diameter of the inner tube is 2 mm, and the liquid passage chamber 54 adopts a double-channel crescent shape. The design length of the catheter tip is 10mm. After the overall connection of the catheter is completed, the surface of the catheter is coated with a hydrophilic coating, and the hydrophilic material is polyvinylpyrrolidone (PVP).

Embodiment 3

[0036] In this embodiment, two developing points are used, which are respectively arranged in the middle of the head end and the balloon, and the material is platinum-iridium alloy. The material of the outer tube is PEBAX, and the hardness gradually decreases from the proximal end to the distal end, respectively 72D, 55D, and 25D. The inner tube is made of three layers of braided material, the outer material is PEBAX, the middle layer is made of nickel-titanium alloy wire, the wire width is 0.15mm, the inner layer is fluororesin (EFEP), and the inner diameter of the inner tube is 1mm. The liquid cavity 56 adopts a three-channel bone shape. The design length of the catheter tip is 15mm. After the overall connection of the catheter is completed, the surface of the catheter is coated with a hydrophilic coating, and the hydrophilic material is polyurethane.

[0037] According to the technical solution of the embodiment of the present invention, the guide catheter is non-coaxial,...

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Abstract

A guide catheter, comprising an outer tube (21), an inner tube (22), one or more liquid flow cavities (5), and an expandable balloon (3) communicating with the liquid flow cavities (5); the liquid flow cavities (5) are arranged in the thick periphery of the outer tube wall, and the farthest distance that the cross section of the liquid flow cavities (5) extends in the circumferential direction of the catheter is greater than the farthest distance of extending in the radial direction of the catheter. The guide catheter can bear a large negative pressure, and has a short time of the balloon pumping back.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a guiding catheter. Background technique [0002] A guiding catheter is a specially designed sheath that provides direction of passage. It is often used to deliver various interventional devices to the target, providing support and protection. With the rapid development of modern technology, in order to meet clinical needs, guiding catheters of various shapes and functions have been developed, such as guiding catheters with balloons. [0003] For balloon guiding catheters, in addition to being able to withstand a certain negative pressure to avoid catheter collapse, the balloon withdrawal time and the flexibility of the guiding catheter tip are also critical. For the current products on the market, due to the collapse of the catheter during the retraction of the balloon, the balloon retraction time is longer, which increases the risk of thrombosis and distal vascula...

Claims

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Application Information

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IPC IPC(8): A61M25/10A61B17/00B32B1/08B32B27/40B32B27/28B32B27/30B32B27/12B32B15/02
CPCA61M25/0045A61M25/0032A61M25/005A61M25/0662A61M25/10
Inventor 黄慧华张滢涛金巧蓉谢志永
Owner PATHFINDER NEUROTECH (SHANGHAI) CO LTD
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