Method and apparatus for blood pressure measurements
US4117835A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1976 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Dec 8, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/022
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for making blood pressure measurements is disclosed particularly adapted to automated measurements of systolic and diastolic blood pressure values. The method includes detecting the rate of change of pressure values existing in an inflatable occluding cuff encircling an extremity of the subject, in whom the blood pressure measurements are to be taken, as the pressure in the occluding cuff is varied from a pressure sufficiently high to completely occlude blood flow to the extremity, to a pressure value in which blood flow takes place in the extremity substantially unaffected by the encircling inflatable cuff. The rate of change of pressure is disclosed as precipitously increasing at a cuff pressure value corresponding to a systolic blood pressure and precipitously declining at a cuff pressure corresponding to diastolic pressure, with the onset of a precipitous increase and decrease detected in order to ascertain the systolic and diastolic pressure values respectively. The particular arrangement disclosed features a rate-of-change-of- pressure transducer which produces a signal directly corresponding to the rate of change of pressure. The transducer includes a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.