Intra-ocular pressure normalization technique and equipment

Details Intra-ocular pressure normalization technique and equipment Intra-ocular pressure normalization technique and equipment

1977-08-31

1979-06-12

Michell, Robert W.

Surgery

Respiratory method or device

Ozone or ion generation

A61M 100, A61M 514

Patent

active

041577183

ABSTRACT:
There is disclosed a method and apparatus for safely reducing abnormally high intra-ocular pressure in an eye during a predetermined time interval. This allows maintenance of normal intraocular pressure during glaucoma surgery. According to the invention, a pressure regulator of the spring-biassed diaphragm type is provided with additional bias by a column of liquid. The height of the column of liquid is selected such that the pressure at a hypodermic needle connected to the output of the pressure regulator is equal to the measured pressure of the eye. The hypodermic needle can then be safely inserted into the anterior chamber of the eye. Liquid is then bled out of the column to reduce the bias on the diaphragm of the pressure regulator and, consequently, the output pressure of the regulator. This lowering pressure of the regulator also occurs in the eye by means of a small second bleed path provided between the pressure regulator and the hypodermic needle. Alternately, a second hypodermic needle may be inserted into the eye to provide a controlled leak-off path for excessive pressure and clouded fluid from the anterior chamber.

REFERENCES:
patent: 3185153 (1965-05-01), Leucci
patent: 3572319 (1971-03-01), Bittner et al.
patent: 3931818 (1976-01-01), Goldowsky
patent: 4078563 (1978-03-01), Tuseth
patent: 4084612 (1978-04-01), Baehr

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