Enhanced diaphragm for pressure sensing system and method
US7568394B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2008 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Apr 24, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/028
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An enhanced pressure sensing system and method use an external diaphragm to address issues involved with accurate and prolonged measurement of fluid pressure, such as of blood flowing in a vascular structure. Some external diaphragms include a metallized layer or other highly impermeable layer to furnish a high degree of seal at least near to hermetic grade. As temperature of the intermediary fluid changes, the external diaphragm is able to move in a direction that minimizes differential pressure across the external diaphragm over an operational temperature range thereby reducing pressure change of the intermediary fluid due to change in temperature of the intermediary fluid. Relatively smooth hydrodynamic surfaces can be used as well as a bi-layer construction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.