Self-operable tonometer for measuring intraocular pressure of a

Details Self-operable tonometer for measuring intraocular pressure of a Self-operable tonometer for measuring intraocular pressure of a

1995-12-08

1997-09-30

Bahr, Jennifer

Surgery

Truss

Pad

128652, A61B 3016

Patent

active

056717377

ABSTRACT:
A tonometer for measuring intraocular pressure (IOP) allows a user to self-operably apply a removable, lightweight, ocular probe to gently flatten an area of the corneal surface. A transducer having a flexible springboard connected to the probe and serving as a plate of a variable capacitor is used to sense forces produced when the probe contacts the eye elastically deforming the springboard. The applanation area is detected with a video camera connected to a central processing unit (CPU) programmed to perform image analysis. The CPU uses multiple force and multiple area values determined in rapid succession so that force and applanation area data are closely related in time. Linear regression analysis is used on data pairs to determine an average value for IOP in only about 1-2 seconds. The probe has a clear window with markings for delimiting a calibration area. The slight passive movements of the probe in this process are frictionless and cause no error in force determination. The IOP determination is independent of gravity and thus may be carried out in any orientation as well as under the condition of weightlessness.

REFERENCES:
patent: 3070997 (1963-01-01), Papritz et al.
patent: 3290927 (1966-12-01), Gambs
patent: 3934462 (1976-01-01), Rende
patent: 4508121 (1985-04-01), Myers
patent: 4523597 (1985-06-01), Sawa et al.
patent: 4558707 (1985-12-01), Miyamae et al.
patent: 4759370 (1988-07-01), Kozin et al.
patent: 4817620 (1989-04-01), Katsuragi et al.
patent: 4860755 (1989-08-01), Erath
patent: 4944303 (1990-07-01), Katsuragi
patent: 4987899 (1991-01-01), Brown
patent: 5033841 (1991-07-01), Nishio et al.
patent: 5056522 (1991-10-01), Matsumura et al.
patent: 5174292 (1992-12-01), Kursar
patent: 5190042 (1993-03-01), Hock
patent: 5203331 (1993-04-01), Draeger
patent: 5305747 (1994-04-01), McNaughton et al.
patent: 5363155 (1994-11-01), Urinowski et al.
Zeimer et al., "An Instrument for Self-Measurement of Intraocular Pressure," IEEE Transactions on Biomedical Eng., vol. BME-29, No. 3, 1982.

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