Abstract: A shunt 10 for implantation in the human body for treating ocular disorders related to disorders of intraocular or intracranial pressure by providing for flow of aqueous fluid in the anterior chamber A of the eye and cerebrospinal fluid in the subarachnoid space B surrounding the optic nerve C. The shunt has a proximal end 12 which is implanted in the ocular anterior chamber and a distal end 14 which is implanted in the subarachnoid space. The shunt has a two-part construction, including a flexible distal tube 18 and a rigid proximal tube 20. The distal tube has a distal stop formation 26 near the distal end 14 which is located in the subarachnoid space upon implantation of the distal end, resisting withdrawal of the shunt. The proximal tube has a curved portion which conforms to the anatomical curvature of the ocular globe.

Abstract: An orbital tissue retractor 10 for use in a surgical operation in the region of an eye socket, comprises an orbital tissue retractor body 12 and a handle 14 extending therefrom for manipulation of the tissue retractor body by a surgeon. The tissue retractor body comprises a channel formation 16 defining a channel 17. The channel formation 16 has a pair of spaced side wall sections 24 which define concave curved ocular abutment formations 26 which conform to an anatomical curvature of the ocular globe for abutment with the ocular globe N. The tissue retractor body has open proximal end 22 and an open distal end 20. The tissue retractor body tapers from the proximal end to the distal end, with a portion of the channel formation at the distal end being curved so as to accommodate and cradle the optic nerve therein. The retractor body has a curved base wall section 28 conforming to an anatomical curvature of the orbit.