Auto-calibration of pressure transducer offset
US6571599B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2000 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Feb 9, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/3358
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A flow generator having use in the provision of CPAP or assisted ventilation treatment is disclosed The flow generator has a turbine for the supply of breathable gas which is driven by an electric motor and an associated motor power supply. The power supply in turn is controlled by a controller. A pressure sensing port measures delivery pressure that is passed to a pressure transducer, the output signal of which is passed to the motor controller. The zero offset of the pressure transducer is automatically calibrated on occurrence of the conditions where the turbine is not operating and no pressure activity is sensed by the transducer. The turbine not operating condition can be determined from Hall-effect sensors integral to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.