Patent US2796505A successfully refreshed from Google Patents.
US4699150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic transducer assembly for medical diagnostic examinations
Assignee: Panasonic Holdings Corp
•
Filing: 1986-05-16
•
Granted: 1987-10-13
•
Expires: 2006-05-16
Abstract
Abstract An ultrasonic transducer for medical diagnostic examinations which comprises a transducer element having one surface through ultrasonic waves are emitted, an acoustic impedance matcher, and a contact member brought to contact with an object being examined and formed on the one surface of the ultrasonic transducer element. The contact member includes at least a flat plate or an acoustic lens made of a-4-methylpentene-1-base polymer which has high mechanical strength. Transducer arrays and assemblies using such polymer as a member directly contacted with human body are also described.
Inventors
- 👤 Masami Kawabuchi
- 👤 Koji Matsuo
- 👤 Fumio Muramatsu
- 👤 Akira Fukumoto
- 👤 Koetsu Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:24
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; G10K11/18; G10K11/26; G10K11/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
An ultrasonic transducer assembly for use in medical diagnostic examinations comprising (a) an ultrasonic transducer member having (i) a transducer element with one surface through which an ultrasonic wave is emitted, (ii) an acoustic impedance matcher formed on the one surface, and (iii) an acoustic lens formed on said acoustic impedance matcher, (b) means for rotationally moving said ultrasonic transducer member, (c) a casing having an acoustic window of a semi-circular form in section and a uniform thickness and encasing said ultrasonic transducer member therein, and (d) an acoustic wave transfer liquid filling said casing, said acoustic window being adapted to contact an object being examined and consisting of a 4-methylpentene-1-base polymer selected from the group consisting of methylpentene homopolymer and copolymers of 4-methylpentene-1 with an olefinic manner, wherein said polymer has an initial flexural modulus of 7,500 to 24,000 kg/cm 2 , a Charpy impact strength of 4 to 5 kg.cm/cm 2 , an Izod impact strength of 10 to 50 kg.cm/cm, a Shore hardness of 100, and a Rockwell hardness of 60 to 90.
Claim 2
Dependent Claim
176 words
An ultrasonic transducer assembly for use in medical diagnostic examinations comprising (a) an ultrasonic transducer member having (i) a transducer element with one surface through which an ultrasonic wave is emitted, (ii) an acoustic impedance matcher formed on the one surface, and (iii) an acoustic lens formed on said acoustic impedance matcher, (b) means for rotationally moving said ultrasonic transducer member, (c) a casing having an acoustic window of a semi-circular form in section and a uniform thickness and encasing said ultrasonic transducer member therein, and (d) an acoustic wave transfer liquid filling said casing, said acoustic window being adapted to contact an object being examined and consisting of a 4-methylpentene-1-base polymer selected from the group consisting of methylpentene homopolymer and copolymers of 4-methylpentene-1 with an olefinic manner, wherein said polymer has an initial flexural modulus of 7,500 to 24,000 kg/cm 2 , a Charpy impact strength of 4 to 5 kg.cm/cm 2 , an Izod impact strength of 10 to 50 kg.cm/cm, a Shore hardness of 100, and a Rockwell hardness of 60 to 90.
References Cited (Backward Citations)
US3269173A
Cited
US3387604A
Cited
US3958559A
Cited
US4001766A
Cited
US4078435A
Cited
US4143554A
Cited
US4121468A
Cited
US4205686A
Cited
US4197921A
Cited
US4385255A
Cited
US4281550A
Cited
US4440025A
Cited
US4387720A
Cited
US4316271A
Cited
US4471084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |