Blood pressure measuring apparatus
US5840036A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Mar 4, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0204
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A blood pressure measuring system includes a transducer having first and second sensors adapted to be mounted above the artery of a patient with the second sensor more distal relative to the direction of blood flow than the first sensor. A processor digitizes the signals from the first and second sensors and determines when the second signal is phase shifted about 90 degrees relative to the first signal for determining the occurrence of the Korotkoff sound. The transducer comprises a film of a material having piezoelectric properties and at least two spaced apart electrodes on one surface of the film and a third electrode on the opposite side and opposed to the two electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.