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Radiofrequency ablation micro-catheter

A technology of radiofrequency ablation and microcatheter, applied in the direction of heating surgical instruments, etc., can solve the problems of insufficient heating time, increased treatment risk, long heating time, etc., to avoid sudden changes in voltage or current, improve detection and control functions, and improve treatment effect of effect

Pending Publication Date: 2019-06-21
BEIJING BOHAIKANGYUAN MEDICAL DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned process, the problem existing in the technology currently used is: the heating process of blood vessels or cavity organs is not accurate enough, and a fixed (according to the clinician’s experience) heating time (such as 20 seconds) is generally set for heating. heating
The problem brought about by this is that the heating time may not be enough to effectively shrink the blood vessel or cavity, and the heating time may be too long (that is, the blood vessel or cavity has been effectively shrunk, while the machine is still delivering energy to the patient, chance of increased treatment risk)
In addition, during the operation, the doctor cannot observe the situation in the blood vessel and the process and effect of the operation
For the radiofrequency ablation closure microcatheter that needs to be inserted into the blood vessel, its size and space are extremely limited, and ordinary temperature sensors, pressure sensors and image observation equipment cannot be installed on the microcatheter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as Figure 1 to Figure 4 , a closed microcatheter for radiofrequency ablation, comprising a catheter 10 on which a heating resistor 20 is wound.

[0042] The catheter is a polymer material catheter, the outer diameter of the catheter is d=1.0mm, and the wall thickness of the catheter is S=0.15mm.

[0043] The heating resistor is a sheet heating resistor. There are two layers of sheet heating resistors laminated inside and outside to form a double layer of sheet heating resistors. figure 1 shown. Likewise, the double-layer chip heating resistor can be welded 22 at the front end, which can also achieve the same effect, such as image 3shown. The double-layer chip heating resistor is helically wound along the conduit to form a single-circuit chip heating resistor. The thickness of the heating resistor is K=0.15mm, and the material of the heating resistor is an alloy with a resistance value of 120 ohms to 300 ohms per meter. In this embodiment, an alloy with a FeCr...

Embodiment 2

[0060] Such as Figure 6 , Figure 7 , a closure microcatheter for radiofrequency ablation. This embodiment is an improvement of the first embodiment.

[0061] In this embodiment, an insulating sleeve 70 is provided between the double-layer sheet heating resistors. The thickness of the insulating sleeve K=0.1mm. The insulating sleeve can use polymer materials such as PEEK polyether ether ketone or PI (polyimide) with high temperature resistance and high voltage resistance. The insulating sleeve in this embodiment is made of PEEK polyetheretherketone.

[0062] The insulating sleeve can reliably avoid the interlayer short circuit of the double-layer chip heating resistor.

[0063] Another important aspect of the insulating sleeve is that it can increase structural rigidity and facilitate surgical operations.

Embodiment 3

[0065] Such as image 3 , a closure microcatheter for radiofrequency ablation. This embodiment is an improvement of the first embodiment.

[0066] In this embodiment, the heating resistor is a double-layer sheet heating resistor welded at the front end, and the material of the outer layer sheet heating resistor 20a of the double-layer sheet heating resistor is an alloy with a resistance value per meter of 120 ohms to 300 ohms. The inner layer of the double-layer chip heating resistor 20b is made of stainless steel.

[0067] According to the structure of the inner and outer sheet heating resistors of the radiofrequency ablation catheter, in view of the fact that the outer sheet heating resistors directly contact the object to be heated, and also according to the circuit series principle, the resistor with a large resistance value in the series circuit consumes a large amount of power ( It is suitable for both current source type RF signal generators and voltage source type RF...

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Abstract

The invention relates to a radiofrequency ablation micro-catheter. The radiofrequency ablation micro-catheter comprises a catheter body, a heating resistor winding the catheter body and fiber gratingwinding the catheter body, wherein the heating resistor is a single-loop flaky heating resistor with an inner layer and an outer layer; the fiber grating comprises an inner layer and an outer layer; the front end of the catheter body is provided with an ultrasonic probe. The radiofrequency ablation micro-catheter has the advantages that the miniature ultrasonic probe is used for imaging to observethe state of blood vessels or cavities during thermal ablation treatment in real time; the fiber grating winding the catheter body is used to detect temperature and stress strain during the thermal ablation treatment; by the flaky heating resistor, the detection and control function of the thermal ablation micro-catheter can be increased greatly, and the structural size of the radiofrequency ablation micro-catheter can be effectively controlled; the control ability and treatment effect during the thermal ablation treatment can be evidently increased, and treatment risks can be lowered.

Description

technical field [0001] The invention belongs to blood vessel medical equipment, in particular to a closed microcatheter for radiofrequency ablation. Background technique [0002] The human lower extremity vascular system mainly includes the surface vascular system and the deep vascular system, as well as the penetrating blood vessels connecting these two systems. The superficial system includes the long or large saphenous vein and the short saphenous vein. The deep vasculature includes the anterior and posterior tibial veins, which combine to form the ankle vein, which itself becomes the femoral vein after being joined by the short saphenous vein. The vascular system includes numerous one-way valves that direct blood back to the heart. Each vascular valve is usually a biconcave valve, and each cleft forms a bag or reservoir of blood. Under retrograde blood pressure, the blood forces the free surfaces of the clefts to gather together to prevent retrograde flow of blood and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B18/14
Inventor 潘福义张强
Owner BEIJING BOHAIKANGYUAN MEDICAL DEVICES
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