Gas stream blower for non-contact type tonometer

Details Gas stream blower for non-contact type tonometer Gas stream blower for non-contact type tonometer

1986-08-25

1988-09-13

Coven, Edward M.

Surgery

Truss

Pad

417553, A61B 316

Patent

active

047701811

ABSTRACT:
A gas stream blower for non-contact type tonometer comprises a cylinder, a piston arranged in the cylinder to divide the interior thereof into an air open chamber and a compression chamber, a nozzle communicated with the compression chamber such that air in compression chamber is compressed by advancing the piston toward the compression chamber and thus the compressed air is blown toward an eye-examining position through the nozzle, a first one way valve which is fitted in the piston and is closed at the time of air compressing, and a second one way valve which is provided in the midway of a communicating path between the compression chamber and the nozzle and is opened when the pressure of the compressed air is higher than a predetermined value.

REFERENCES:
patent: 2084665 (1937-06-01), Aikman
patent: 2377916 (1945-06-01), Anderson
patent: 2764098 (1956-09-01), Dickey et al.
patent: 3018779 (1962-01-01), Tyler et al.
patent: 3585849 (1971-06-01), Grolman
patent: 3752604 (1973-08-01), Dorn
patent: 3894817 (1975-07-01), Majoros et al.
patent: 4374330 (1983-02-01), Fey

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