RESPIRATOR AND METHOD FOR DETERMINING A FRESH GAS FLOW

摘要

A respirator (1) includes a fresh gas port (23, 25, 27) for connecting a fresh gas supply, a gas outlet (3) for connecting a supply line for a patient, an absolute pressure sensor (21) and a data processor (37). The gas outlet and the fresh gas port are fluidically connected via an inhalation branch (17) that is connected to the absolute pressure sensor. The fresh gas port has an adjusting valve (31), to set gas flow from the fresh gas supply to the inhalation branch, and a differential pressure sensor (33). The differential pressure sensor determines a differential pressure in the fresh gas port between the inhalation branch and the adjusting valve. The data processor receives and records the absolute pressure measured and the differential pressure to determine a fresh gas flow through the fresh gas port. A method for determining a fresh gas flow is also shown and described.

主权项

1. A respirator comprising:
a fresh gas port for connecting a fresh gas supply, the fresh gas port comprising an adjusting valve and a differential pressure sensor; an inhalation branch, a gas flow from the fresh gas supply to the inhalation branch being set via the adjusting valve, the differential pressure sensor being arranged and configured to measure a differential pressure in the fresh gas port between the inhalation branch and the adjusting valve; a gas outlet for connecting a supply line for a patient, the gas outlet being connected fluidically with the fresh gas port via the inhalation branch; an absolute pressure sensor arranged to measure an absolute pressure in the inhalation branch; a data processor connected with the absolute pressure sensor and connected with the differential pressure sensor to receive and record the absolute pressure measured by the absolute pressure sensor at a plurality of times and to receive and record the differential pressure measured by the differential pressure sensor at a plurality of times, wherein the data processor is configured to determine a fresh gas flow through the fresh gas port at a defined time from the differential pressure measured at the defined time, from the absolute pressure measured at the defined time and from one or more absolute pressures measured at times chronologically preceding the defined time.