Intra-ocular pressure apparatus

Claim 1

An apparatus for controlling intra-ocular pressure during eye surgery wherein material is to be removed from an eye, the apparatus comprising: first and second hollow tube means for insertion through a surface of the eye, the first and second hollow tube means defining an internal diameter of about 0.3 mm (0.010 in.); first and second expansible bodies of equal size, the expansible bodies each having a maximum capacity in the range of about 5-10 cc's, said bodies having portions movable therein to effect expansion and contraction of fluid reservoirs defined by the bodies, one of the bodies being connected in unobstructed fluid communication with said tube means to discharge a fluid and the other of the bodies being connected in unobstructed fluid communication with said tube means to draw in a fluid; conduits connecting the hollow tube means to the reservoirs of the expansible bodies to form, in conjunction with said tube means and said expansible bodies a substantially closed and unobstructed fluid system leading from one of the bodies through the eye to the other of the bodies; and, drive means operable to displace the movable portions of the expansible bodies in register and in opposite direction, whereby equal volumes of fluid are drawn in and discharged to the eye substantially isometrically and isobarically with respect to said eye.

Claim 2

An apparatus for controlling intra-ocular pressure during eye surgery wherein material is to be removed from an eye, the apparatus comprising: first and second hollow tube means for insertion through a surface of the eye, the first and second hollow tube means defining an internal diameter of about 0.3 mm (0.010 in.); first and second expansible bodies of equal size, the expansible bodies each having a maximum capacity in the range of about 5-10 cc's, said bodies having portions movable therein to effect expansion and contraction of fluid reservoirs defined by the bodies, one of the bodies being connected in unobstructed fluid communication with said tube means to discharge a fluid and the other of the bodies being connected in unobstructed fluid communication with said tube means to draw in a fluid; conduits connecting the hollow tube means to the reservoirs of the expansible bodies to form, in conjunction with said tube means and said expansible bodies a substantially closed and unobstructed fluid system leading from one of the bodies through the eye to the other of the bodies; and, drive means operable to displace the movable portions of the expansible bodies in register and in opposite direction, whereby equal volumes of fluid are drawn in and discharged to the eye substantially isometrically and isobarically with respect to said eye.

Claim 14

An apparatus for simultaneously drawing and discharging equal amounts of fluid from an eye cavity, comprising: two barrels, each defining a reservoir having a full volume of about 5-10 cc's and having an outlet passage at an end of said reservoir, the outlet passages for the two barrels being disposed at opposite ends of said barrels and being fluidly coupleable, via respective means for connecting, to an eye cavity and forming a substantially closed and unobstructed fluid system; and, a plunger body having means on opposite ends thereof dimensioned to movably seal the plunger body to portions of the barrels said defining reservoirs to thereby vary a volume of the reservoirs between zero and said full volume, whereby upon fixing the barrels and moving the plunger body, one of the reservoirs takes in and the other of the reservoirs discharges, through the respective outlet passages for said reservoirs, a predetermined equal amount of the fluid moving from and into said eye cavity substantially isometrically and isobarically with respect to said eye cavity.

Claim 15

An apparatus for simultaneously drawing and discharging equal amounts of fluid from an eye cavity, comprising: two barrels, each defining a reservoir having a full volume of about 5-10 cc's and having an outlet passage at an end of said reservoir, the outlet passages for the two barrels being disposed at opposite ends of said barrels and being fluidly coupleable, via respective means for connecting, to an eye cavity and forming a substantially closed and unobstructed fluid system; and, a plunger body having means on opposite ends thereof dimensioned to movably seal the plunger body to portions of the barrels said defining reservoirs to thereby vary a volume of the reservoirs between zero and said full volume, whereby upon fixing the barrels and moving the plunger body, one of the reservoirs takes in and the other of the reservoirs discharges, through the respective outlet passages for said reservoirs, a predetermined equal amount of the fluid moving from and into said eye cavity substantially isometrically and isobarically with respect to said eye cavity.