US3889518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for consistent response to a fluid pulse and method and apparatus for verifying instruments utilizing fluid pulses
Assignee: CAMBRIDGE INSTRUMENTS Inc A CORP OF
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Filing: 1973-12-26
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Granted: 1975-06-17
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Expires: 1993-12-26
Abstract
Abstract A simulator having a resilient spherical section which flexes in a consistent manner when subjected to a fluid pulse mounted by frictional engagement with a tapered base inserted into the end of a body opposite the spherical surface without causing distortion or stresses within the body producing inconsistent flexing of the spherical section. A plurality of such devices may be mounted on a convenient holder for individual presentation to the fluid pulse of an instrument, such as a tonometer, to simulate specific interocular pressures for verification.
Inventors
- 👤 Pieter J Denouter
- 👤 Bernard Grolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:57
CPC Classifications
G; G01; G01L; G01L27/00; A; A61; A61B; A61B3/00; A61B3/10; A61B3/16; A61B3/165
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
154 words
A device which is consistently responsive to a fluid pulse comprising: a mounting means including a resilient base having a generally ring-shaped cross-section and an external surface tapering inwardly toward one end thereof, a resilient simulator adapted to be held by said base, said simulator having a body of a generally ring-shaped crosssection and a responder closing one end of said body, said responder having a chosen thickness and a convex substantially spherical exterior surface, said body having an internal diameter less than the maximum diameter of said external surface of the base, said simulator being mounted with the tapering external surface of said base at least partially within the other end of said body, said external tapering surface having a taper chosen to provide sufficient frictional engagement to hold said simulator such that said responder flexes in a consistent manner under the pressure of a fluid pulse applied to the surface thereo. thereof.
Claim 2
Independent Claim
154 words
A device which is consistently responsive to a fluid pulse comprising: a mounting means including a resilient base having a generally ring-shaped cross-section and an external surface tapering inwardly toward one end thereof, a resilient simulator adapted to be held by said base, said simulator having a body of a generally ring-shaped crosssection and a responder closing one end of said body, said responder having a chosen thickness and a convex substantially spherical exterior surface, said body having an internal diameter less than the maximum diameter of said external surface of the base, said simulator being mounted with the tapering external surface of said base at least partially within the other end of said body, said external tapering surface having a taper chosen to provide sufficient frictional engagement to hold said simulator such that said responder flexes in a consistent manner under the pressure of a fluid pulse applied to the surface thereo. thereof.
Claim 3
Dependent Claim
28 words
The device according to claim 1 further including an outwardly extending flange on said base to locate said simulator on the tapering external surface in a chosen position.
Claim 4
Dependent Claim
21 words
The device according to claim 1 wherein each of said base and said simulator is molded as a one piece unit.
Claim 5
Dependent Claim
22 words
The device according to claim 1 wherein said mounting means further includes a substantially rigid casing and said base is secured thereto.
Claim 6
Dependent Claim
39 words
The device according to claim 2 wherein the other end of said simulator has a surface tapering inwardly toward said one end to provide contact between the outer edge of said flange and the other end of said simulator.
Claim 7
Dependent Claim
51 words
The device according to claim 1 wherein the body has a continuous side wall, said side wall having a thickness chosen to provide substantially rigid response to force components parallel to the axis of said ring-shaped cross-section and resilient response to force components normal to the axis of said ring-shaped cross-section.
Claim 8
Dependent Claim
76 words
The device according to claim 2 wherein said mounting means further includes a substantially rigid hollow casing, said casing having a continuous internal sidewall complementary to the shape of said body, said side wall having an internal diameter substantially equal to the maximum diameter of said simulator, an inwardly extending flange at one end of said continuous side wall of said casing and said base being inserted in said casing and secured to said casing flange.
Claim 9
Dependent Claim
25 words
The device according to claim 1 wherein said responder has a thickness chosen to provide applanation in response to a specific force component normal thereto.
Claim 10
Independent Claim
245 words
A device which is consistently responsive to a fluid pulse comprising: a mounting means including a hollow, substantially cylindrical rigid casing having an inwardly extending flange on one end thereof, a resilient base secured to said flange in said casing, said base having an exterior surface of revolution extending along an axis substantially coincident with the axis of said casing and said exterior surface tapering inwardly away from said flange, a resilient one piece simulator adapted to be held by said base, said simulator having a hollow body with a continuous side wall of a chosen thickness with an internal diameter less than the maximum internal diameter of the exterior surface of said base, and a convex substantially spherical responder of chosen thickness closing one end of said body, the other end of said body being inserted into said casing and surrounding at least a portion of said exterior surface, said exterior surface having a taper and maximum diameter chosen to provide sufficient frictional engagement to hold said simulator such that said responder flexes in a consistent manner under the pressure of a fluid pulse normal to the surface of said responder, the thickness of said responder being chosen to provide applanation at a specific pressure of said fluid pulse and the side wall thickness of said body being chosen to respond in a substantially rigid manner to force components parallel to the body axis and to yield to foRce components normal to the body.
Claim 11
Independent Claim
245 words
A device which is consistently responsive to a fluid pulse comprising: a mounting means including a hollow, substantially cylindrical rigid casing having an inwardly extending flange on one end thereof, a resilient base secured to said flange in said casing, said base having an exterior surface of revolution extending along an axis substantially coincident with the axis of said casing and said exterior surface tapering inwardly away from said flange, a resilient one piece simulator adapted to be held by said base, said simulator having a hollow body with a continuous side wall of a chosen thickness with an internal diameter less than the maximum internal diameter of the exterior surface of said base, and a convex substantially spherical responder of chosen thickness closing one end of said body, the other end of said body being inserted into said casing and surrounding at least a portion of said exterior surface, said exterior surface having a taper and maximum diameter chosen to provide sufficient frictional engagement to hold said simulator such that said responder flexes in a consistent manner under the pressure of a fluid pulse normal to the surface of said responder, the thickness of said responder being chosen to provide applanation at a specific pressure of said fluid pulse and the side wall thickness of said body being chosen to respond in a substantially rigid manner to force components parallel to the body axis and to yield to foRce components normal to the body.
Claim 12
Dependent Claim
14 words
In combination, at least one device according to claim 9 and a non-contacting tonometer.
Claim 13
Dependent Claim
32 words
The combination of claim 10, wherein the thickness of said responder is chosen to provide applanation simulating a specific interocular pressure in response to application of an air pulse from said tonometer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |