Breathing assistance apparatus
US9750905B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2003 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Dec 11, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2240/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pressure regulating device includes a housing having an inlet, a main outlet, an J an external venting outlet. An internal venting aperture is between the inlet and the external venting outlet. A valve is between the external venting outlet and the internal venting aperture. When the pressure of gases in the flow path is below a predetermined level, the valve at least partially blocks the internal venting aperture. When the pressure is above the predetermined level, the valve opens to allow at least a portion of the gases to flow from the inlet through the internal venting aperture and the external venting outlet. The valve is shaped to open in such a manner that the portion of gases flowing varies with the flow rate, such that the pressure at the main outlet is substantially constant over the flow rate range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.