Surgery – Diagnostic testing – Testing aqueous humor pressure or related condition
Patent
1997-04-23
1998-11-10
Bahr, Jennifer
Surgery
Diagnostic testing
Testing aqueous humor pressure or related condition
600405, A61B 316
Patent
active
058336060
ABSTRACT:
A noncontact tonometer for measuring intraocular pressure is provided. When a rotary solenoid (7) is supplied with electric power, a piston (4) within a cylinder (2) is moved up, and thereby air is jetted through a nozzle (9) of a head (3) toward an eye (H) of a subject. At the same time, infrared rays are projected onto the eye (H) from a light source (11). Reflected light from a cornea of the eye (H) is received by a light receiving sensor (12). A signal generated by the light receiving sensor (12) is transmitted to a control circuit (16) via a flat-state detecting circuit (13). As a result, the intraocular pressure of the eye (H) is measured. The noncontact tonometer further includes two condensers (17, 18). A command from the control circuit (16) is input to a condenser switching portion (20) by operating a driving switch (21). Thereby, one of the condensers (17, 18) is selected to supply the rotary solenoid (7) with the electric power.
REFERENCES:
patent: 4996990 (1991-03-01), Hideshima
patent: 5002056 (1991-03-01), Takahashi et al.
patent: 5107851 (1992-04-01), Yano et al.
patent: 5279300 (1994-01-01), Miwa et al.
patent: 5523808 (1996-06-01), Kohayakawa
Bahr Jennifer
Kabushiki Kaisha Topcon
Yarnell Bryan K.
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