Abstract: An on demand supplemental oxygen delivery system that is self-calibrating includes a tank containing a supply of oxygen and a nasal cannula through which the oxygen may be provided to a patient when the system solenoid valve is in the open condition. When the valve is in the closed condition, the cannula communicates with a pressure transducer via a transducer line. An orifice is formed in the line so that the pressure within the transducer line goes to atmospheric pressure when the valve is in the open condition. The pressure transducer reads the atmospheric pressure and directs it to a system controller where it is stored as a reference pressure.

Abstract: An on demand supplemental oxygen delivery system that is self-calibrating includes a tank containing a supply of oxygen and a nasal cannula through which the oxygen may be provided to a patient when the system solenoid valve is in the open condition. When the valve is in the closed condition, the cannula communicates with a pressure transducer via a transducer line. An orifice is formed in the line so that the pressure within the transducer line goes to atmospheric pressure when the valve is in the open condition. When the valve is in the open condition, the pressure transducer reads the atmospheric pressure and directs it to a system controller where it is stored as a reference pressure. When the valve is in the closed condition, the pressure transducer monitors the pressure in the nasal cannula.

Abstract: A distributed intelligence system for controlling a plurality of groups and equipment for use in dentistry is disclosed wherein the system comprises four separate micro controllers; each micro controller contains its own predetermined routines and a first micro controller being located within control circuitry wherein the control circuitry generates control signals for a first group of tools or equipment, a second micro controller being located within foot switches wherein the foot switches generate control signals for a second group of tools or equipment, a third micro controller located within a control console wherein the control console generates control signals for a third group of tools or equipment and a forth micro controller being located within a power supply wherein the power supply generates control signals for a forth group of tools or equipment. The micro controllers are all interconnected by a wire cable and communicate with one another using a serial communication bus protocol.

Abstract: A shared resource system (20) is disclosed wherein multiple user devices (24) share a resource device such as a disk drive (36). The multiple user devices (24) are interconnected to the resource device by high speed synchronous serial data links (26). Each of the user devices (24) include a serial to parallel/parallel to serial converter means (22) for converting and transmitting on the high speed synchronous serial data links (26) user device requests to access the resource device. The resource device includes a serial to parallel/parallel to serial converter means (30) for converting and transmitting such user device requests on a parallel data bus to the resource device. The resource device converter means (30) including multiple access ports (54) to enable multiple user devices (24) to access the resource device, the converter means (30) individually and periodically polling each of the access ports (54).