Ophthalmologic cannula

Claim 1

A cannula for use in applying liquid media to an eye comprising: a housing having a longitudinal axis, a sealing portion at a proximal end and a main shaft extending from said sealing portion to a distal end, said housing defining a longitudinal passageway through which the liquid media can be applied, said main shaft having an upper surface and a bottom surface, said bottom surface of said main shaft having first and second longitudinal edges which define the width of said main shaft, said longitudinal edges on said bottom surface defining a plane, said bottom surface being contained in said plane, said main shaft having a height, said width of said main shaft being greater than said height of said main shaft, said housing having an exit port, said exit port being located at the distal end of said bottom surface of said main shaft, said distal end of said upper surface of said housing being smooth and rounded, said sealing portion being a bulbous portion of said housing and having lateral dimensions greater than those of said main shaft, said sealing portion having a bottom surface which is continuous with said bottom surface of said main shaft, said bottom surface of said main shaft being planar and said bottom surface of said sealing zone being co-planar with said bottom surface of said main shaft, whereby said bulbous sealing portion serves to block whatever opening is made in tissue for inserting said main shaft into the eye to thereby prevent outflow of the liquid media applied through said cannula.