Microwave signal inhibition device, method, antenna assembly and microwave ablation needle

Abstract

A microwave signal inhibition device and method, an antenna assembly and a microwave ablation needle are provided. The microwave signal inhibition device comprises a composite structure. The compositestructure comprises non-metallic material with a low dielectric constant, and a plurality of metal thin films formed on the non-metallic material, wherein the length of each section of the metal thinfilm is one fourth to three fourths of wavelength of a to-be-inhibited microwave signal; an interval between the metal thin films is one tenth to one twentieth of wavelength of the to-be-inhibited microwave signal; and a relative dielectric constant of the non-metallic material with the low dielectric constant relative to vacuum is less than or equal to 5. The microwave signal inhibition device and the microwave ablation needle based on multi-stage choke flow technology have great self-adaptivity; upon small input power or short ablation time, or power decrease or ablation time reduction, anideal spherical ablation area can be achieved; and compared with a common design, microwave energy can be fully utilized and carbonization degree of a central area can be reduced.

Description

technical field [0001] The present invention relates to the technical field of microwave treatment equipment, and more specifically relates to a microwave signal suppressing device and method, an antenna assembly for microwave ablation and a microwave ablation needle using the same. Background technique [0002] Since the first report in 1994 that ultrasound-guided percutaneous puncture was successful in the treatment of small liver cancer by implanting microwave antennas into tumors, microwave ablation technology has developed rapidly through continuous improvement and innovation of microwave instruments and antennas. Early microwave ablation needles did not have a water-cooling circulation system, and the needle shaft was easily overheated, and could only support a small power input of 10-30W. The width of the in vitro ablation area was only 1-2 cm, and the shape was irregular. The application of the water-cooled circulation system makes the temperature of the microwave ne...

AI Technical Summary

Problems solved by technology

The electromagnetic wave will be absorbed in a large amount when passing through the ablation area, but the energy of the electromagnetic wave entering the peripheral extended ablation area is very little, which leads to the insufficient use of electromagnetic energy in the extended ablation area, and instead increases the degree of carbonization of the ablation area

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