Patent US4576176A successfully refreshed from Google Patents.
US4576176A
Expired / Lapsed
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Transducer for measurement of corneal thickness
Assignee: MEDSYS Inc
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Filing: 1984-12-21
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Granted: 1986-03-18
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Expires: 2004-12-21
Abstract
Abstract Apparatus for measuring corneal thickness. A transducer is provided that transducer includes a plurality of piezo-electric arcuate segments arranged in a circle to form an annular member. The segments are electrically and acoustically isolated from each other. Leads are connected to each segment for the transmission of electrical signals. The transducer is one component of a system for measuring corneal thickness. Also included in the system are a transmitter which is connected to the leads for applying an electrical signal to the segments to produce respective sound pulses, respective receivers connected to the leads for converting the signals into distance measurements, an averager capable of averaging the distance measurements and a display device to display the average distance.
Inventors
- 👤 George H. Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:18
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/063; A; A61; A61B; A61B3/00; A61B3/10; A61B3/1005; A61F; A61F9/00; A61F9/007; A61F9/013
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A transducer for use in corneal measurements, said transducer comprising: a plurality of peizo-electric arcuate segments for producing ultra-sonic signals, said segments arranged in a circle to form a toroidal member having upper and lower surfaces lying in a plane perpendicular to the axis of the toroid, each one of said segments having a vibratory axis, the vibratory axis of each segment being oriented so that the ultrasonic signals produced by said plurality of segments are propagated along a path substantially parallel to the axis of said toroid, whereby said ultrasonic signals are directed toward an eye located adjacent one of said surfaces; insulation means for electrically isolating each of said plurality of segments from the other; acoustic means for acoustically isolating each of said plurality of segments from the other; and lead means connected to each of the plurality of segments for transmission of electrical signals.
Claim 2
Dependent Claim
147 words
A transducer for use in corneal measurements, said transducer comprising: a plurality of peizo-electric arcuate segments for producing ultra-sonic signals, said segments arranged in a circle to form a toroidal member having upper and lower surfaces lying in a plane perpendicular to the axis of the toroid, each one of said segments having a vibratory axis, the vibratory axis of each segment being oriented so that the ultrasonic signals produced by said plurality of segments are propagated along a path substantially parallel to the axis of said toroid, whereby said ultrasonic signals are directed toward an eye located adjacent one of said surfaces; insulation means for electrically isolating each of said plurality of segments from the other; acoustic means for acoustically isolating each of said plurality of segments from the other; and lead means connected to each of the plurality of segments for transmission of electrical signals.
Claim 3
Dependent Claim
16 words
The transducer of claim 1, wherein said plurality of segments includes between two to four segments.
Claim 4
Dependent Claim
15 words
The transducer of claim 2, wherein said plurality of segments includes four ninety degree segments.
Claim 5
Dependent Claim
33 words
The transducer of claim 1, wherein said transducer has an outer diameter of substantially 3.0 mm, an inner diameter of substantially 1.00 mm and a surface area of about 6.5 cm 2 .
Claim 6
Dependent Claim
17 words
The transducer of claim 1, wherein said transducer operates using a resonant frequency of substantially 20 Mhz.
Claim 7
Dependent Claim
24 words
The transducer of claim 1, wherein said acoustic means comprises the orientation of piezo-electric crystals such that they vibrate only in a longitudinal direction.
Claim 8
Dependent Claim
21 words
The transducer of claim 1 wherein said acoustic means comprises a mixture of rubber particles embedded in epoxy between said segments.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |