Inhalation/exhalation respiratory phase detection circuit
US5438980A · kind A · utility
282Cited by
35References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Jan 12, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2016/0021
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus (10) for controlling the pressure of a respiratory gas delivered to a patient includes a phase detection circuit (24) for determining the inhalation and exhalation phases of the patient's respiratory cycle. More particularly, a flow signal representative of the respiratory flow is compared to second signal, offset in time and scaled in magnitude relative to the flow signal, in order to determine the transition from one phase to the next.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.