US3675192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for establishing the speed of flow of blood
Assignee: Siemens AG
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Filing: 1969-09-12
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Granted: 1972-07-04
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Expires: 1989-09-12
Abstract
Abstract A device for determining the speed of blood flow in blood vessels uses the ultrasonic Doppler effect method and includes an ultrasonic transmitter and a receiver for receiving ultrasounds reflected from the flowing blood as well as means determining a value proportional to the speed of the blood flow from the transmitting and receiving frequencies. The device is particularly characterized by a measuring device which measures the amplitudes of several selected frequencies within the frequency spectrum of the reflected ultrasonic wave or when using a member connected with the ultrasonic receiver for providing the difference between the receiving and transmitting frequencies within the frequency spectrum of the differential signal, the measuring device being connected with a calculating device.
Inventors
- 👤 Kurt Erich Fahrbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/50; G01S15/58; G01S15/60; A; A61; A61B; A61B8/00; A61B8/06; G01F; G01F1/00; G01F1/66; G01F1/663; G01S15/586; G01S7/00; G01S7/52; G01S7/52017; G01S7/52023; G01S7/52033
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A device for determining the speed of blood flow from blood vessels which uses the ultrasonic Doppler effect method, said device comprising an ultrasonic transmitter, a receiver for receiving ultrasounds reflected from the flowing blood, a measuring device for measuring amplitudes of several individual selected frequencies within the frequency spectrum of the reflected ultrasonic wave, or when using a member connected with said ultrasonic receiver for providing a difference between the receiving and transmitting frequencies within the frequency spectrum of the differential signal, said measuring device consisting of filters set to the individual selected frequencies which differ from each other to the extent of a predetermined unvariable value and peak detectors connected with and following said filters, and a calculating device comprising a second summing member directly following and connected with all peak detectors, a first summing member, proportioning members connected with all peak detectors and said first summing member and adjustable to a value proportional to the resonance frequency of the corresponding filter and a division member for providing a quotient from the outgoing signals of the first and second summing members.
Claim 2
Independent Claim
183 words
A device for determining the speed of blood flow from blood vessels which uses the ultrasonic Doppler effect method, said device comprising an ultrasonic transmitter, a receiver for receiving ultrasounds reflected from the flowing blood, a measuring device for measuring amplitudes of several individual selected frequencies within the frequency spectrum of the reflected ultrasonic wave, or when using a member connected with said ultrasonic receiver for providing a difference between the receiving and transmitting frequencies within the frequency spectrum of the differential signal, said measuring device consisting of filters set to the individual selected frequencies which differ from each other to the extent of a predetermined unvariable value and peak detectors connected with and following said filters, and a calculating device comprising a second summing member directly following and connected with all peak detectors, a first summing member, proportioning members connected with all peak detectors and said first summing member and adjustable to a value proportional to the resonance frequency of the corresponding filter and a division member for providing a quotient from the outgoing signals of the first and second summing members.
Claim 3
Dependent Claim
17 words
A blood flow measuring device according to claim 1, wherein said proportioning members consist of adjustable potentiometers.
Claim 4
Dependent Claim
34 words
A blood flow measuring device according to claim 1, comprising an indicating device connected to the outlet of said division member for indicating or registering outgoing values proportional to the average blood flow speed.
References Cited (Backward Citations)
US3121856A
Cited
US3498290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |