US3676584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo coincidence ultrasonic scanning
Assignee: Individual
•
Filing: 1970-07-13
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Granted: 1972-07-11
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Expires: 1990-07-13
Abstract
Abstract An ultrasonic visualization system for investigating human tissue structures, comprising pulse generator, power supply, pulse trigger, one transducer which transmits ultrasonic pulses, four transducers, arranged at 90* angles around the center transmitter, which receive reflected echoes, video amplifier and display tube. The output pulses of each pair of receivers 180* apart are connected through time coincidence circuitry to detect echoes originating only at the axis of the ultrasonic beam and to reject multiple reflection echoes, thus echograms of high resolution are obtained.
Inventors
- 👤 Chris J Plakas
- 👤 Mee See Phua
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:08
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/42; A61B8/4209; G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8909; G01S15/8913; G01S15/8915; G01S15/8922; G01S15/8934; G01S15/8945; Y; Y10; Y10S; Y10S367/00; Y10S367/901; Y10S367/905
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
An utrasonic visualization system providing two dimensional echograms of high resolution through echo coincidence comprising: a. transducer means for transmitting ultrasonic pulses comprising one focusing transmitting transducer positioned in the center of a transducer frame, said transmitting transducer converting electrical pulses into acoustical pulses that are propagated through a coupling liquid toward a scanned subject; b. transducer means for receiving reflected echoes, said transducer receiving means comprising, an even number of receiving transducers positioned in said transducer frame so as to encircle said transmitting transducer and face at equal distances the focus of said transmitting transducer, said receiving transducers operating in opposite pairs through coincidence circuitry and receiving echoes and converting said echoes from said scanned subject into electrical signals c. means for exciting said transmitting transducer d. echo coincidence means for analyzing the electrical signals generated by said receiving transducers and for discriminating true echoes from multiple reflections; and e. display means for recording accurate representations of cross sections of said scanned subject.
Claim 2
Dependent Claim
164 words
An utrasonic visualization system providing two dimensional echograms of high resolution through echo coincidence comprising: a. transducer means for transmitting ultrasonic pulses comprising one focusing transmitting transducer positioned in the center of a transducer frame, said transmitting transducer converting electrical pulses into acoustical pulses that are propagated through a coupling liquid toward a scanned subject; b. transducer means for receiving reflected echoes, said transducer receiving means comprising, an even number of receiving transducers positioned in said transducer frame so as to encircle said transmitting transducer and face at equal distances the focus of said transmitting transducer, said receiving transducers operating in opposite pairs through coincidence circuitry and receiving echoes and converting said echoes from said scanned subject into electrical signals c. means for exciting said transmitting transducer d. echo coincidence means for analyzing the electrical signals generated by said receiving transducers and for discriminating true echoes from multiple reflections; and e. display means for recording accurate representations of cross sections of said scanned subject.
Claim 3
Dependent Claim
30 words
The system of claim 1 wherein said means for exciting a transmitting transducer comprises a pulse generator, pulse trigger, and power supply operating in combination to excite said transmitting transducer.
Claim 4
Dependent Claim
66 words
The system of claim 1 wherein said echo coincidence means includes pairs of receiving transducers, each pair being connected in coincidence circuit with a coincidence analyzer, a time delay unit, and a compensator, and providing for selection of signals reflected from impedance discontinuities along the axis of an ultrasonic beam and received within a preadjusted time delay, and further providing for amplitude modulation of said signals.
Claim 5
Dependent Claim
32 words
The system of claim 1 wherein said echo coincidence means further includes an electronic gate providing for selection of output signal from one coincidence analyzer and permitting flow into a display unit.
Claim 6
Dependent Claim
62 words
The system of claim 1 wherein said display means comprises a video amplifier, a display tube, a position monitor including a mechanism for moving said transducer frame with constant scanning speed and an electronic circuit for monitoring said frame''s location and accordingly positioning a trace on the screen of said display tube, and a camera providing a permanent record of said echograms.
References Cited (Backward Citations)
US3273148A
Cited
US3371660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |