Flow rate monitor for fluid cooled microwave ablation probe

摘要

A microwave ablation system includes an antenna assembly configured to deliver microwave energy from a power source to tissue and a coolant source operably coupled to the power source and configured to selectively provide fluid to the antenna assembly via a fluid path. The system also includes a controller operably coupled to the power source and a sensor operably coupled to the fluid path and the controller. The sensor is configured to detect fluid flow through the fluid path and the controller is configured to control the energy source based on the detected fluid flow.

主权项

1. An electrosurgical ablation system, comprising:
a power source; an antenna assembly configured to deliver electrosurgical energy from the power source to tissue; a coolant source operably coupled to the antenna assembly via a fluid path, the coolant source configured to supply a fluid to the antenna assembly through the fluid path; a sensor operatively coupled to the fluid path, the sensor configured to sense a flow of the fluid through the fluid path and generate a signal indicative of the flow of the fluid; an amplifier disposed in a resonant feedback loop with the sensor and configured to generate output to a band pass filter centered on a resonant frequency consistent with fluid flow through the fluid path; and a controller operably coupled to the sensor and the power source, the controller configured to modify output of energy from the power source based on the signal.