A Microwave Ablation Needle Antenna Containing a Movable Choke Loop or Loop

Abstract

The invention discloses a microwave ablation needle antenna comprising a movable choke ring or ring, which comprises: a needle rod; a puncture head; and an antenna, wherein the antenna is composed of a coaxial cable and a pole core, and the pole core and The inner conductors of the coaxial cable are welded together; the coaxial cable is arranged in the needle bar, and the pole core is arranged in the piercing head; the water diversion pipe is arranged in the coaxial Between the cable and the needle bar; the coaxial cable, the water diversion pipe, and the needle bar are coaxially placed; a choke ring or a ring, and the choke ring or ring is located between the water diversion pipe and the Between the coaxial cables, or between the water diversion pipe and the needle bar, or integrated with the water diversion pipe; the handle, the outer shell of the handle is connected to the other end of the needle bar; wherein, The handle or the needle bar is provided with a movement assembly for axially moving the choke ring or ring. The invention realizes adjustable width-to-length ratio and conformal ablation of the needle antenna.

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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