A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
128/111
A61B 17/00 (2006.01) A61F 9/007 (2006.01)
Patent
CA 1132425
NASA Case No. LEW-12,955-1 ABSTRACT OF THE DISCLOSURE 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 intra-ocular 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 pres- sure 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.
310383
Baehr Edward F.
National Aeronautics And Space Administration
Swabey Ogilvy Renault
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