Method for measuring central venous pressure or respiratory effort
US7691067B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2007 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Jun 14, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1135
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Photoplethysmography (PPG) is obtained using one red (e.g., 660 nm) and one infrared (e.g., 880 to 940 nm) light emitting diode with a single photo diode in combination with a pressure transducer thereby allowing both CVP and SpO2 to be measured simultaneously. The system also includes sensors capable of measuring position, angle and/or movement of the sensor or patient. Once the PPG signal is acquired, high pass adaptive and/or notch filtering can be used with one element of the filter from the red and infrared signals used to measure the arterial changes needed to compute SpO2 and the other element of the signal can be used to measure CVP changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.