Microwave power source and microwave ablation therapeutic equipment thereof

Abstract

The invention discloses a microwave power source and a microwave ablation therapeutic instrument, which relate to a full-solid-state microwave power generating circuit and a microwave therapeutic instrument circuit. The microwave power source adopts a full-solid-state circuit close-loop control to achieve stable microwave power output and continuous adjustable microwave power. The microwave energy can generate enough penetration depth in human tissue to enlarge the ablation range. The ablation range of 915 MHz microwave frequency band is larger than that of 2,450 MHz microwave frequency band, so that the 915 MHz microwave frequency band is more suitable for ablation therapy. The microwave power source comprises a microwave signal generator, a power control time adjusting circuit, an impedance matcher, a drive circuit, a power splitter, a plurality of power amplifiers, a power mixer, an isolator and a power tracking and detecting circuit. The microwave ablation therapeutic instrument is constituted by the microwave power source and a microwave ablation pin under control of a microprocessor.

Description

technical field [0001] The invention relates to a microwave power generating circuit and a microwave treatment instrument, in particular to an all-solid-state microwave power source and a microwave ablation treatment instrument. Background technique [0002] Microwave ablation for tumor treatment is a minimally invasive technique emerging in the 1990s. Under the guidance of images, it directly inserts the microwave ablation puncture needle into the patient's tumor site, transmits microwave energy into the tumor tissue through the microwave ablation puncture needle, and generates a high temperature of 60-120 degrees Celsius, causing the tumor tissue to coagulate in a short time necrosis, so as to achieve the purpose of treatment. [0003] At present, the operating frequency of microwave ablation instruments at home and abroad is 2450MHz. The maximum penetration depth of 2450MHz microwave in aqueous tissue is 1.7cm. This feature directly limits the range of thermal coagulat...

AI Technical Summary

Problems solved by technology

The start-up voltage of the magnetron needs a high-voltage power supply above 1200V, which is poor in safety during treatment.

In addition, the more important thing is that the output power of the magnetron will produce a wide range of power fluctuations with the temperature change of its magnetic material, which is difficult to control and maintain a stable power output state, which seriously affects the clinical treatment effect of tumors.

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