EP0164730A2
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EP
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Non-contact type tonometer
Assignee: Topcon Corp
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Filing: 1985-06-11
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Granted: —
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Expires: 2005-06-11
Abstract
Abstract A non-contact type tonometer is disclosed. It has an arrangement for transfiguring a cornea to be tested by discharging a fluid to it. This first arrangement comprises a rotary solenoid, a cylinder, and a rotary solenoid driving circuit. It also has a second arrangement for detecting the physical quantity showing the transfiguration of the cornea. The second arrangement comprises a radiating optical system and a detecting optical system. It also has a circuit serving as a third arrangement for detecting the flow pressure of the fluid which has a correlation with an intraocular pressure. It has a fourth arrangement for establishing a correlation function curve between the physical quantity and the flow pressure of the fluid based on the information from the second and third arrangements, deducing a flow pressure value corresponding to the preset value of the physical quantity from the correlation function curve, and converting such deduced flow pressure value of the fluid to an intraocular pressure value.
Inventors
- 👤 Fumio C/O Tokyo Kogaku Kikai K.K. Ohtomo
- 👤 Susumu C/O Tokyo Kogaku Kikai K.K. Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:37
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/16; A61B3/165
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A non-contact type tonometer comprising: fluid discharging means adapted to discharge a fluid toward a cornea of an eye being tested in order to transfigure the cornea; corneal transfiguration detecting means adapted to detect the transfiguration of the cornea; flow pressure detecting means adapted to detect the flow pressure of said fluid discharged toward the cornea; and intraocular pressure value converting means for establisming a correlation function curve between interocular pressure of a transfigured cornea and the flow pressure of a fluid discharged against the cornea and for determining the interocular pressure of the eye being tested based upon the level of said detected flow pressure at the time of said detection of corneal transfiguration by said corneal transfigaration detectiong means.
Claim 2
Dependent Claim
121 words
A non-contact type tonometer comprising: fluid discharging means adapted to discharge a fluid toward a cornea of an eye being tested in order to transfigure the cornea; corneal transfiguration detecting means adapted to detect the transfiguration of the cornea; flow pressure detecting means adapted to detect the flow pressure of said fluid discharged toward the cornea; and intraocular pressure value converting means for establisming a correlation function curve between interocular pressure of a transfigured cornea and the flow pressure of a fluid discharged against the cornea and for determining the interocular pressure of the eye being tested based upon the level of said detected flow pressure at the time of said detection of corneal transfiguration by said corneal transfigaration detectiong means.
Claim 3
Dependent Claim
57 words
A non-contact type tonometer according to claim 1, wherein said fluid discharging means includes a cylinder having said fluid therein and having a nozzle extending toward the cornea of the eye under test, a piston provided within said cylinder, and driving means for reciprocally moving said piston to discharge the fluid from said nozzle toward the cornea.
Claim 4
Dependent Claim
48 words
A non-contact type tonometer according to claim 1, wherein said corneal transfiguration detecting means includes a radiating optical system for projecting a light flux toward the cornea of the eye under test and a detecting optical system for detecting the light flux which is reflected on the cornea.
Claim 5
Dependent Claim
121 words
A non-contact type tonometer according to claim 3, wherein said radiating optical system includes a light source, a projecting lens for projecting light emitted from said light source onto the cornea, and a first diaphragm disposed at a focal point of said projecting lens between said light source and said projecting lens, and said detecting optical system includes an image-formation lens for forming an image of said first diaphragm of said radiating optical system by the light reflected by the cornea, a second diaphragm disposed at a position on which the image is formed, and a photoelectric converter for detecting the quantity cf light passing through said second diaphragm and for converting said quantity of detected light to an electric signal.
Claim 6
Dependent Claim
19 words
A non-contact type tonometer according to claim 1, wherein said flow pressure detecting means includes a flow pressure sensor.
Claim 7
Dependent Claim
87 words
A non-contact type tonometer comprising: a fluid generator for generating and discharging a fluid under pressure toward a cornea of an eye to be tested in order to transfigure the cornea thereof; a cornea transfiguration detector for opto-electrically detecting transfiguration of the cornea; a pressure detector for detecting the level fluid pressure of said fluid at the time when the cornea is transfigured by a predetermined amount; and intraocular pressure deducing means for deducing the intraocular pressure of the eye from said detected level of fluid pressure.
Claim 8
Dependent Claim
87 words
A non-contact type tonometer comprising: a fluid generator for generating and discharging a fluid under pressure toward a cornea of an eye to be tested in order to transfigure the cornea thereof; a cornea transfiguration detector for opto-electrically detecting transfiguration of the cornea; a pressure detector for detecting the level fluid pressure of said fluid at the time when the cornea is transfigured by a predetermined amount; and intraocular pressure deducing means for deducing the intraocular pressure of the eye from said detected level of fluid pressure.
Claim 9
Dependent Claim
54 words
A non-contact type tonometer according tc claim 6, wnerein said fluid generator includes a cylinder having a first nozzle having a tip portion and extending toward the cornea, a piston provided within said cylinder, and driving means for reciprocally moving said piston to discharge said fluid under pressure through said nozzle toward the cornea.
Claim 10
Dependent Claim
36 words
b. A non-contact type tonometer according tc claim 7, wherein said pressure detector includes a pressure sensor positioned in said cylinder for detecting the internal pressure of said cylinder correlated with said pressure of said fluid.
Claim 11
Dependent Claim
64 words
A non-contact type tonometer according to claim 7, wherein said cylinder further includes a second nozzle having a tip portion and said pressure detector includes a pressure sensor disposed in such a manner that the distance between said tip portion of said second nozzle and said pressure sensor is equal to the distance between said tip portion of said first nozzle and the cornea.
Claim 12
Dependent Claim
116 words
A non-contact type tonometer comprising: fluid discharging means adapted to discharge a fluid under pressure toward a cornea of an eye to be tested in order to transfigure the cornea; flow pressure detecting means for detecting the flow pressure of said fluid; a radiating optical system for projecting a light flux toward the cornea; a detecting optical system for detecting the quantity of said light flux which is reflected on the cornea in correlation with the flow pressure detected by said flow pressure detecting means; and intraccular pressure value determining means for determing the intraocular pressure of the eye from said detected flow pressure at the time when the detected light flux has a maximum value.
Claim 13
Dependent Claim
116 words
A non-contact type tonometer comprising: fluid discharging means adapted to discharge a fluid under pressure toward a cornea of an eye to be tested in order to transfigure the cornea; flow pressure detecting means for detecting the flow pressure of said fluid; a radiating optical system for projecting a light flux toward the cornea; a detecting optical system for detecting the quantity of said light flux which is reflected on the cornea in correlation with the flow pressure detected by said flow pressure detecting means; and intraccular pressure value determining means for determing the intraocular pressure of the eye from said detected flow pressure at the time when the detected light flux has a maximum value.
References Cited (Backward Citations)
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