Blood pressure monitoring in noisy environments
US5392781A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1991 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Apr 16, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Several techniques are provided for aiding in the discrimination of detected biological signals indicative of blood pressure from detected signals not indicative of blood pressure (e.g., noise). A threshold, based predominantly on a level of noise, is developed and used in the discrimination. A second threshold, based predominantly on levels of previously detected biological signals, is developed and additionally used to help discriminate the biological signals from noise. The biological signals are detected during a selected portion of a cardiac cycle, and additional signals detected outside of the selected portion of the cycle are applied to the detected signals. Another threshold may be developed based predominantly on a level of signals sensed by a transducer positioned to preferentially sense noise; the transducer is positioned so that the noise that it detects is related to noise that is detected during the detection of the biological signals. Blood pressure is measured during periodically scheduled measurement cycles, and a measurement cycle is suspended if noise exceeds a predetermined level. The times at which the detected signals (i.e., the signals indicative of blood pre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.