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Renal artery radio frequency ablation catheter as well as manufacturing method and application method thereof

A technology of radiofrequency ablation and catheter ablation, which is applied in the direction of heating surgical instruments, etc., and can solve problems such as ineffective and reliable treatment of intractable hypertension

Active Publication Date: 2011-07-20
APT MEDICAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catheters in the prior art are simple and cannot effectively and reliably treat refractory hypertension.

Method used

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  • Renal artery radio frequency ablation catheter as well as manufacturing method and application method thereof
  • Renal artery radio frequency ablation catheter as well as manufacturing method and application method thereof
  • Renal artery radio frequency ablation catheter as well as manufacturing method and application method thereof

Examples

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Effect test

preparation example Construction

[0030] The preparation method of the renal artery radiofrequency ablation catheter of the present invention is divided into the preparation of the sheath tube and the ablation catheter, comprising the following steps:

[0031] 1. Preparation of the sheath

[0032] 1. Use the 35-type extruder of Dongguan Shengan Plastic Machinery Co., Ltd. to extrude PEBAX raw materials with specifications of 72D, 63D, and 55D produced by Arkema, France, into PEBAX with hardnesses of 72D, 63D, and 55D respectively. Tube, PEBAX tube inner diameter is 2.0mm to 2.5mm, outer diameter is 2.5mm to 2.8mm, tube length is 1.0m to 1.1m, set screw speed: 10n / min to 30n / min, barrel pressure: 1500Mpa to 2000Mpa, Traction speed: 30m / s.

[0033] 2. On the 316L stainless steel rod produced by Shanghai United Metal Materials Co., Ltd. with an outer diameter of 1.7mm to 1.8mm, manually cover the PTFE HS 2:1 AWG HeatShrinkThinWall series No. 15 / 14 PTFE tube of the American ZEUS company, The inner diameter befor...

Embodiment 1

[0058] Embodiment 1, the outer diameter of the selected sheath tube is 2.6mm, and the distal end of the sheath tube starts at 3mm, and 4 elliptical small holes are uniformly divided into 90° in the circumferential direction, the center distance between adjacent small holes is 12mm, and the long axis of the elliptical hole is 8mm, the short axis is 1.4mm, 4 marking rings are installed on the sheath, the distance between the marking ring near the small hole and the center of the small hole is 6mm, the marking ring width is 2mm, and the thickness is 0.5mm. The outer diameter of the ablation catheter is 1.1mm, and the distal end is equipped with an ablation electrode, the outer diameter of the ablation electrode is 1.33mm, and the length is 4mm. Renal artery ablation was performed on two dogs with refractory hypertension, each weighing 30kg, systolic blood pressure 200Kpa, diastolic blood pressure 140Kpa, renal artery inner diameter 3.5mm, punctured through the femoral artery, and ...

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Abstract

The invention discloses a renal artery radio frequency ablation catheter as well as a manufacturing method and an application method thereof, and aims to solve the technical problem of reducing the blood pressure of a patient with refractory hypertension. The renal artery radio frequency ablation catheter comprises a sheath tube and an ablation catheter loaded in the sheath tube, wherein a small hole is formed on the wall of the distal end of the sheath tube and an ablation electrode of the ablation catheter extends out of the small hole. The manufacturing method provided by the invention involves in the independent manufacturing of the sheath tube and the ablation catheter. The application method provided by the invention comprises the following steps: the sheath tube and the ablation catheter are delivered into a renal artery through a femoral artery, and the ablation electrode is pushed to reach the position of the small hole of the sheath tube and then move out of the sheath tube to ablate the sympathetic nerves in the renal artery. Compared with the prior art, the sheath tube is loaded into the renal artery, and the ablation catheter extends out of the small hole of the sheath tube to ablate the sympathetic nerves on the inner wall of the renal artery one by one so as to destroy the sympathetic nerves dominating the kidney, so as to achieve the purpose of treating refractory hypertension by ablation of the sympathetic nerves in the renal artery.

Description

technical field [0001] The invention relates to a medical device and its preparation method and use method, in particular to a radio frequency ablation catheter for treating obstinate hypertension by intervening in radio frequency ablation of the sympathetic nerve of the renal artery, as well as its preparation method and use method. Background technique [0002] Refractory hypertension is relatively common clinically, with many pathogenic factors, unclear pathogenesis, poor drug treatment effect, and immature diagnosis and treatment technology, which has become one of the major problems in the treatment of hypertension, and such patients are usually combined Have other cardiovascular diseases, such as coronary heart disease, diabetes, heart failure, hyperlipidemia, kidney disease, peripheral artery disease, stroke, left ventricular hypertrophy, etc. Among the various complications of hypertension, the damage to the heart, brain, and kidney is the most significant. According...

Claims

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Application Information

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IPC IPC(8): A61B18/12
Inventor 成正辉
Owner APT MEDICAL INC
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