Eye filtration prosthesis for relieving intraocular pressure

Details Eye filtration prosthesis for relieving intraocular pressure Eye filtration prosthesis for relieving intraocular pressure

A - Human Necessities

61

F

A61F 9/00 (2006.01) A61F 9/007 (2006.01)

Patent

CA 2115263

2115263 9303778 PCTABS00020 A technique and device for relieving intraocular pressure with a reduced risk of inflammation that may be caused by retrograde flow back into the eye. A unidirectional drainage device (50) is implanted which allows fluid flow away from the eye with a minimal pressure gradient (5 mm Hg. or less), and includes means to prevent retrograde flow. When implanted, the drainage passageway is initially restricted by a flow restrictor (53) at a point downstream from the minimal pressure gradient unidirectional valve (56). Between valve (56) and flow restrictor (53) is a drainage trap (57) in which debris is receivable without restricting the operativeness of valve (56). After fibrosis has occurred to prevent excessive drainage that might cause hypotony, flow restrictor (53) is removed to allow the free flow of fluid away from the eye, with inflammatory debris being prevented from reentering the eye.

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