Covidien Ag

Sherwood Services Ag

Derek M Blaha

William N Gregg

William G Paterson

A redundant temperature monitoring system and method for an electrosurgical system are provided. The temperature monitoring circuit includes at least one temperature sensor for sensing a temperature at a measuring point, a first temperature measurement circuit coupled to the at least one temperature sensor for generating a first temperature value, a second temperature measurement circuit coupled to the at least one temperature sensor for generating a second temperature value, and a control circuit for determining a difference between the first and second temperature values and for comparing the difference to a first predetermined threshold. If the difference is greater than the first predetermined threshold, the control circuit generates a warning signal. If the difference is greater than a second predetermined threshold, the control circuit generates an alarm signal and/or shuts down a power source of the electrosurgical system.

Redundant temperature monitoring in electrosurgical systems for safety mitigation

A thermocouple measuring circuit for sensing a temperature at a measuring point is provided. The thermocouple measurement circuit () includes a thermocouple input for sensing a temperature at a measuring point, a compensation circuit () for compensating thermocouple effects of junctions of the thermocouple, and an instrumentation amplifier () for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed, wherein the output of the compensation circuit is a reference voltage for the output of the instrumentation amplifier. Various embodiments of the thermocouple measurement circuit may be employed in electrosurgical generators for controlling output power dependent on temperature conditions.

Thermocouple measurement system

Thermocouple measurement circuit

An electrosurgical generator is provided which includes a continuity test circuit assembly for testing electrical continuity through an electrode of an electrosurgical instrument. The continuity test circuit assembly includes a test power source providing electrical test energy to a first conductor which is in electrical communication with the electrode and the electrosurgical generator and to at least one second conductor which is coupled to the first conductor for providing a path for current to flow between the first conductor and the at least one second conductor for establishing a test path through which the test energy flows between the first conductor and at least one conductor of the at least one second conductor. The continuity test circuit assembly further includes energy detection circuitry positioned along the test path for detecting the flow of the test energy through the test path for determining electrical continuity through the electrode.

Method and system for continuity testing of medical electrodes

A system for monitoring a plurality of return electrodes is disclosed. The system includes a plurality of return electrodes adhered to a patient and adapted to couple to an electrosurgical generator configured to generate an electrosurgical current. The system also includes a current monitor connected in series with each of the plurality of the return electrodes to measure a current signal passing therethrough and a processor coupled to each of the current monitors. The processor is configured to determine a desired current ratio and an actual current ratio for each of the plurality of the return electrodes as a function of the current passing through each of the plurality of the return electrodes. The processor is further configured to compare the desired current ratio and the actual current ratio.

System and method for return electrode monitoring

A control system for an electrosurgical instrument includes a housing selectively positionable relative to an operating theater with the housing being coupled to an electrosurgical energy source. The system also includes at least one foot-activatable pedal operatively engaged with the housing which has indicia identifying the function of the pedal disposed thereon. Illuminating means are also included with the system which illuminating means are designed to illuminate at least a portion of the pedal which, in turn illuminates the indicia.

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Longmont, CO, United States of America

Derek M Blaha