Abstract: A portable system for managing the temperature of a patient during transport includes a heater/cooler configured to be in fluid communication with a heat transfer catheter or a heat transfer surface pad; a pump for circulating heat exchange fluid; an alternating current power supply; and a processor configured to indicate if the alternating current power supply connection to the source of alternating current is interrupted. A rechargeable battery may be configured to provide power to the system when the alternating power supply is not connected to a source of alternating current. If the system is powered on and the connection to the alternating current source is interrupted, the system may automatically switch to receiving power from the rechargeable battery. The processor may alert an operator of the interruption of the connection to the alternating current source and indicate to the operator the amount of energy remaining in the battery.

Abstract: A battery system for powering a transportable thermal management system for altering or maintaining a patient's body temperature by endovascular and/or external heat exchange.

Abstract: A circuit for controlling a silicon-controlled rectifier includes a high breakdown voltage metal-oxide semiconductor field-effect transistor (MOSFET) connected to drive the gate of the silicon-controlled rectifier. The high breakdown voltage MOSFET is itself controlled by a gate voltage. The power requirements for the gate trigger circuit of a series string silicon-controlled rectifier are greatly reduced by using the high breakdown voltage MOSFET as a gate triggering circuit for the silicon-controlled rectifier. Because the MOSFET consumes little power, a limited power source, such as a snubber capacitor voltage that is developed during the OFF-state of the silicon-controlled rectifier, can be used to power the gate trigger circuit.

Abstract: An apparatus for isolating driver circuits from silicon-controlled rectifier (SCR) circuits in an electric switch. The driver circuits are located on a driver-board, which includes an infrared (IR) emitter. The SCR circuits are located on a SCR switch-board, which includes an IR receiver. An insulating body is positioned between the driver-board and the switch-board. The insulating body encloses a light-pipe to optically link the infrared emitter to the infrared detector. Control signals can be communicated from the driver circuits to the SCR circuits via the IR emitter, the light-pipe, and the IR receiver.

Abstract: A circuit that includes a silicon-controlled rectifier and a silicon-controlled rectifier gate trigger circuit connected to the silicon-controlled rectifier. A snubber capacitor is connected to the silicon-controlled rectifier and the silicon-controlled rectifier gate trigger circuit. The snubber capacitor generates a snubber capacitor voltage during an off state of the silicon-controlled rectifier. The snubber capacitor voltage thus developed is then used to power the silicon-controlled rectifier gate trigger circuit. The circuit also includes a resister-zener diode circuit connected to the snubber capacitor and an auxiliary capacitor. The auxiliary capacitor is charged through the resister-zener diode circuit by the snubber capacitor voltage. A voltage regulator is connected between the auxiliary capacitor and the silicon-controlled rectifier gate trigger circuit for providing a regulated voltage.