Patent ID: 6302106
Filing Date: 2001-10-16
Classification: B63C

Abstract:
A rebreather system of the closed circuit-type comprising a flow loop including a counterlung, the rebreather system comprising:a breathing gas supply source;a pressure regulator, coupled between the breathing gas supply source and the flow loop;a mass flow controller for controlling the flow rate of the breathing gas to the flow loop, coupled between the pressure regulator and the flow loop, the mass flow controller having a variable flow rate;a pressure transducer for indicating depth as a function of ambient pressure;a breathing gas source capacity indicator;an oxygen sensor; anda digital signal processing circuit, configured to receive data from the pressure transducer, the gas source capacity indicator and the oxygen sensor, the digital signal processing circuit being firmware programmed to perform calculations on said data and further programmed to perform calculations on data input by a user including whole body oxygen toxicity time limits, and no-decompression time limits, so as to define an oxygen partial pressure within the rebreather's counterlung which maximizes bottom time and no-decompression time, while minimizing accumulated whole body oxygen toxicity time.