CA2441513A1 - Replaceable prism for applanation tonometer - Google Patents
Replaceable prism for applanation tonometer Download PDFInfo
- Publication number
- CA2441513A1 CA2441513A1 CA002441513A CA2441513A CA2441513A1 CA 2441513 A1 CA2441513 A1 CA 2441513A1 CA 002441513 A CA002441513 A CA 002441513A CA 2441513 A CA2441513 A CA 2441513A CA 2441513 A1 CA2441513 A1 CA 2441513A1
- Authority
- CA
- Canada
- Prior art keywords
- prism
- applanation surface
- tonometer
- light
- applanation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/16—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring intraocular pressure, e.g. tonometers
Landscapes
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Optics & Photonics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A tonometer (70, 80, 90), preferably for a single use, has an applanation surface (12), an input port (15) arranged to transmit incoming light into the prism, and an output port (16) arranged to transmit outgoing light from the prism. Light entering the input port is directed in an unreflected straight path through the prism to an internal face of the applanation surface. Light internally reflected from the applanation surface proceeds in an unreflected straight path through the prism to the output port.
Claims (11)
1 . A tonometer prism having an applanation surface, an input port arranged to transmit incoming light into the prism, and an output port arranged to transmit outgoing light from the prism, the tonometer prism comprising:
a. the input port being arranged to direct the incoming light from the input port in an unreflected straight path through the prism from the input port to an internal face of the applanation surface; and b. light internally reflected from the internal face of the applanation surface proceeding from the applanation surface in an unreflected straight path through the prism to the output port.
a. the input port being arranged to direct the incoming light from the input port in an unreflected straight path through the prism from the input port to an internal face of the applanation surface; and b. light internally reflected from the internal face of the applanation surface proceeding from the applanation surface in an unreflected straight path through the prism to the output port.
2. The tonometer prism of claim 1 wherein the input and output ports are symmetrically congruent with respect to the applanation surface and each obliquely confronts the applanation surface.
3. The tonometer prism of claims 1 or 2 wherein the input and output ports are respectively normal to the light paths within the prism.
4. The tonometer prism of any of the claims 1-3 wherein axes of the input and output ports intersect in a central region of the applanation surface.
5. The tonometer prism of any of the claims 1-4 wherein the input port is a plane surface arranged at about a 45° angle to the applanation surface on one side of the applanation surface and the output port is a plane surface arranged at about a 45° angle to the applanation surface on an opposite side of an applanation surface.
6. The tonometer prism of any of the claims 1-5 including an applanation surface viewing port arranged between the input and output ports.
7. The tonometer prism of any of the claims 1-6 wherein the prism is a single-use prism.
8. The tonometer prism of any of the claims 1-7 wherein the light from the input port substantially uniformly illuminates the internal face of the applanation surface.
9. The tonometer prism of any of the claims 1-8 wherein substantially all of the light internally reflected from the internal face of the applanation surface proceeds to the output port.
10. The tonometer prism of any of the claims 1-9 wherein the prism is substantially triangular.
11. The tonometer prism of any of the claims 1-9 wherein the prism is substantially hexagonal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/811,709 US6736778B2 (en) | 1997-12-22 | 2001-03-19 | Replaceable prism for applanation tonometer |
| US09/811,709 | 2001-03-19 | ||
| PCT/US2002/007736 WO2002075368A2 (en) | 2001-03-19 | 2002-03-14 | Replaceable prism for applanation tonometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2441513A1 true CA2441513A1 (en) | 2002-09-26 |
| CA2441513C CA2441513C (en) | 2011-05-17 |
Family
ID=25207329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2441513A Expired - Lifetime CA2441513C (en) | 2001-03-19 | 2002-03-14 | Replaceable prism for applanation tonometer |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1377203A4 (en) |
| AU (1) | AU2002252345B2 (en) |
| CA (1) | CA2441513C (en) |
| WO (1) | WO2002075368A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7153267B2 (en) * | 2003-01-30 | 2006-12-26 | Francis Y Falck, Jr. | Ophthalmologic applanation prism replacement system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2643879A1 (en) * | 1976-09-29 | 1978-03-30 | Instrumentarium Oy | Eye internal pressure measuring prism - has flat side placed on eye and incorporates light intensity detector |
| US4886066A (en) * | 1988-09-13 | 1989-12-12 | See Care Corporation | Tonometer having acoustic coupling detection |
| DE3931630A1 (en) * | 1989-09-22 | 1991-05-08 | Datron Electronic Gmbh | METHOD AND DEVICE FOR DETERMINING THE INTERNAL PRESSURE OR THE LIKE |
| US5070875A (en) * | 1990-11-19 | 1991-12-10 | Falcken, Inc. | Applanation tonometer using light reflection to determine applanation area size |
| GB9103360D0 (en) * | 1991-02-18 | 1991-04-03 | Clement Clarke Int | Improvements relating to applanation tonometers |
| US6179779B1 (en) * | 1997-12-22 | 2001-01-30 | Ffhk Development Company Llc | Replaceable prism system for applanation tonometer |
-
2002
- 2002-03-14 CA CA2441513A patent/CA2441513C/en not_active Expired - Lifetime
- 2002-03-14 WO PCT/US2002/007736 patent/WO2002075368A2/en not_active Application Discontinuation
- 2002-03-14 AU AU2002252345A patent/AU2002252345B2/en not_active Expired
- 2002-03-14 EP EP02721411A patent/EP1377203A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002075368A2 (en) | 2002-09-26 |
| WO2002075368A3 (en) | 2002-12-19 |
| AU2002252345B2 (en) | 2005-07-14 |
| CA2441513C (en) | 2011-05-17 |
| EP1377203A2 (en) | 2004-01-07 |
| EP1377203A4 (en) | 2007-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20220314 |