Ultrasonic Doppler diagnostic device
US4651742A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1985 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Mar 28, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B8/06
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ultrasonic diagnostic device for measuring the velocity of blood flow within a living body comprises a receiver for amplifying a received wave in accordance with a logarithmic amplification characteristic and at least one inverse logarithmic converter which produces an output having an inverse logarithmic characteristic with respect to the input thereto. As a result, the device can carry out high-precision measurement of blood flow even when the component of the received wave corresponding to the blood flow is much smaller than a component of the received wave corresponding to the wall of the blood vessel or heart through which the blood is flowing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.