Temperature controlled RF coagulation
Patent 5122137 Issued on June 16, 1992. Estimated Expiration Date: 
April 27, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 27, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1885106 3634652 3798967 3895635 Electrosurgical and ECG monitoring system Radio frequency cautery instrument and control unit therefor Constant output electrosurgical unit System for monitoring integrity of a patient return circuit Electrosurgical unit Process and device for the therapeutic treatment of hemorrhoids InventorAssigneeApplicationNo. 515850 filed on 04/27/1990US Classes:606/40, Coagulation606/42, With switching or power control606/49coagulationExaminersPrimary: Pellegrino, Stephen C.Assistant: Shumaker, Steven J. Attorney, Agent or FirmInternational ClassA61B 017/39AbstractRadiofrequency medical devices for ohmic heating of tissue of a patient include a temperature sensor carried by and in thermally conductive relationship with a thermally conductive electrode. The sensor is connected for feedback to a control circuit that modulates RF power applied to the electrode according to the signal received from the temperature sensor. The control circuit and RF power supply alternate between two operating modes. In the first mode the RF power supply applies RF power to the electrode. In the second mode the control circuit senses a signal from the temperature sensor in the absence of RF signal. The control circuit compares the signal from the temperature sensor to a set value and modulates the RF power applied to the electrode in accordance with the set value.Other References
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