A magnetic resonance compatible microwave ablation instrument

Abstract

The invention relates to a magnetic resonance compatible microwave ablation instrument, which is characterized in that the microwave ablation instrument comprises a shielding chassis made of heat conduction non-magnetic material, a power supply module, a microwave generation module and a main control module arranged in the shielding chassis. The power supply module is electrically connected with the microwave generation module and the main control module to supply power to the microwave generation module and the main control module. The main control module is electrically connected with the microwave generation module for controlling the power of the microwave generation module. The microwave generating module adopts transistor microwave solid-state source. A heat sink made of thermally conductive non-magnetic material is fixedly arranged on the outside of the shielding chassis. In accordance with that prior art. The invention has the advantages that the microwave generation module adopts the transistor microwave solid-state source, the non-magnetron mode, the output frequency is stable, the power is constant, the magnetic compatibility and the electromagnetic compatibility are better than the magnetron mode, the heat is dissipated through the shielding chassis, and the whole microwave ablation instrument is made of the magnetism-free device, so as to prevent the influence on the field uniformity of the magnetic resonance.

Description

technical field [0001] The invention relates to a magnetic resonance compatible microwave ablation instrument. Background technique [0002] Cancer is one of the leading causes of death worldwide. WHO estimates that 84 million people will die from cancer between 2005 and 2015. There are 4.3 million new cancer cases and 2.8 million cancer deaths in China every year, ranking first in the world in both indicators. [0003] Except for a few tumors that can be surgically removed, most tumor treatments mainly include chemotherapy, radiation therapy, transcatheter arterial embolization, laser, radiofrequency, microwave ablation, high-intensity ultrasound focused ablation, cryotherapy, gene therapy, etc. [0004] Since the beginning of the 21st century, medical microwave technology has developed rapidly, especially microwave ablation of tumors has rapidly developed into a major means of clinical tumor treatment. [0005] Microwave ablation system is to insert microwave ablation n...

AI Technical Summary

Problems solved by technology

When the nuclear magnetic resonance system works, it needs a stable static magnetic field and a changing electromagnetic field. This complex electromagnetic field environment will cause the conventional microwave system to fail to work normally.

[0009] 2. The conventional microwave ablation system contains various power supplies inside. Considering the miniaturization and weight of the system, switching power supply is often used

However, the operation of the motor inside the peristaltic pump often produces a changing electromagnetic field, which is prone to electromagnetic interference, which affects the diagnosis of magnetic resonance images.

[0011] 4. For conventional microwave ablation systems, the efficiency of the microwave source power amplifier tube is low, generally only 30-40%, and a large amount of power is converted into heat

The motor of the fan will generate electromagnetic interference, if not handled properly, it will affect the quality of MRI images

[0012] 5. Conventional microwave ablation systems have no requirements for materials, and components with ferromagnetic materials are often included in the system, such as ferromagnetic chassis, iron core inductors, ferromagnetic screws, etc.

A longer transmission cable will bring more energy loss, and the longer the transmission cable, the greater the loss. In addition, the transmission cable will also generate electromagnetic interference, which will affect the imaging of the magnetic resonance system

[0014] 7. The conventional microwave ablation system has no temperature control feedback, or can only measure the temperature of the position of the microwave needle shaft, but cannot obtain the temperature of the microwave needle tip, let alone the temperature field distribution in the tumor tissue

This time-sharing method not only greatly reduces the working efficiency of the system, but also makes the potential function of magnetic resonance imaging to monitor tissue ablation in real time useless.

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