Microwave ablation needle-shaped antenna containing movable choke ring or circle

Abstract

The invention discloses a microwave ablation needle-shaped antenna containing a movable choke ring or circle. The microwave ablation needle-shaped antenna comprises a needle bar, a puncture head, an antenna body, a water guide pipe, the choke ring or circle, and a handle, wherein the antenna body is composed of a coaxial cable and a pole core, and the pole core and an inner conductor of the coaxial cable are welded together; the coaxial cable is arranged in the needle bar, and the pole core is arranged in the puncture head; the water guide pipe is arranged between the coaxial cable and the needle bar; the coaxial cable, the water guide pipe and the needle bar are coaxially placed; the choke ring or circle is positioned between the water guide pipe and the coaxial cable, or positioned between the water guide pipe and the needle bar, or integrated with the water guide pipe; a shell of the handle is connected with the other end of the needle bar; and a moving assembly for moving the chokering or circle along the axial direction is arranged on the handle or the needle bar. With the microwave ablation needle-shaped antenna containing the movable choke ring or circle, the adjustable width-length ratio and conformal ablation of the needle-shaped antenna are realized.

Description

technical field [0001] The invention relates to the technical field of microwave ablation instruments, in particular to a microwave ablation needle antenna comprising a movable choke ring or ring, which can realize the function of adjusting and controlling the ablation shape. Background technique [0002] Modern medicine has found that when tumor tissue is heated above 45°C, it will undergo denaturation. Microwave ablation is the use of microwave energy to act on the tissue to produce a thermal effect. Within a few minutes to ten minutes, the central temperature of the thermal field can reach above 100°C, so that the tumor tissue is coagulated and inactivated at an instantaneous high temperature, achieving tumor ablation purpose of treatment. [0003] Generally, the ablation shape of microwave ablation can be measured by the ratio of the ablation length perpendicular to the needle shaft and along the needle shaft (ie, width-to-length ratio). The closer the ratio is to 1, th...

AI Technical Summary

Problems solved by technology

[0010] However, in the case of a patient with a large single tumor or multiple tumors, a single ablation needle needs to be used to ablate multiple times at the same site or adjacent sites, and the tumors at different sites have different shapes. Ablation needles with width to length ratio cannot be applied to the ablation of tumors of different shapes at the same time, which is not conducive to achieving the goal of "conformal ablation"

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