Wearable blood pressure sensor and method of calibration
US7641614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2006 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Dec 7, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0219
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and apparatus for measuring arterial blood pressure at an extremity of a subject. Arterial blood pressure is derived from a circulatory measurement performed on an extremity of a subject and the circulatory measurement is normalized to account for the instantaneous vertical displacement of the extremity. The vertical displacement of the extremity relative to the heart of the subject is obtained using the angular orientation of the subject's extremity. An improved photoplethysmograph can discriminate light traversing the extremity from ambient light on the basis of differential response. The apparatus may have a conducting polymer actuator for applying pressure to the extremity of the subject. A pulsatile waveform from the photoplethysmographic signal may be obtained at a plurality of externally applied pressures to calibrate the photoplethysmograph.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.