Abstract: A thermal cover member for delivering a fluid to a patient's body, such as heated or cooled air, includes a hollow housing member having an inlet port for receiving the pressurized fluid. A plurality of cells are positioned about the housing member to create fluidic spaces for applying the fluid to the body of the patient. Each cell has a non-inflatable canopy with a continuous perimeter sealingly connected to the housing member with the housing member having a plurality of exit ports communicating with each cell to provide an egress of fluid. The fluidic spaces within a cell can be dimensioned to accommodate anatomical configurations of the patient's body and a thermo-chromatic indicator can be provided on the cover member to indicate a temperature of the corresponding fluidic space. The canopy can be transparent to permit viewing of the patient's body.

Abstract: An inflatable blanket heater draws room air into the unit through a filtered intake by an electrically-powered blower. The air is compressed by the blower and warmed by an electric heater in the unit. The warmed air is forced through an outlet filter that removes air particles down to 0.2-micron. The filtered warmed air is delivered to a convective (inflatable) heating blanket by an air delivery hose.

Abstract: A pneumotach gas flow transducer having strain gauge pressure transducers disposed therein for disposition in a selected element or component of a ventilatory circuit. A differential pressure is communicated from the upstream and downstream sides of a flow restrictor in the element's passageway to the transducers via a barrier medium which fills holes in the element and contacts the transducer elements.

Abstract: Temperature measurement with thermocouples is made more accurate, and the cost of disposable thermocouples is reduced by locating the cold junction close to the hot junction, utilizing a thermistor in thermal communication with the cold junction in developing a compensating voltage which varies with temperature as does the voltage produced by the cold junction, and applying the compensating voltage to cancel the cold junction voltage. The presence of radio frequency fields in the region of the thermocouple is detected and utilization of the thermocouple voltage is interrupted in intervals when the interference is greater than some preselected intensity. Further, the thermocouple voltage information is utilized to simulate the resistance a thermistor would have at the temperature represented by the thermistor voltage information and that simulated resistance is applied to instrumentation designed to measure temperature with a thermistor.

Abstract: Temperature measurement with thermocouples is made more accurate, and the cost of disposable thermocouples is reduced by locating the cold junction close to the hot junction, utilizing a thermistor in thermal communication with the cold junction in developing a compensating voltage which varies with temperature as does the voltage produced by the cold junction, and applying the compensating voltage to cancel the cold junction voltage. The presence of radio frequency fields in the region of the thermocouple is detected and utilization of the thermocouple voltage is interrupted in intervals when the interference is greater than some preselected intensity. Further, the thermocouple voltage information is utilized to simulate the resistance a thermistor would have at the temperature represented by the thermistor voltage information and that simulated resistance is applied to instrumentation designed to measure temperature with a thermistor.