Liquid drainage system with anti-reflux valve

Claim 1

A urine drainage system, comprising: a receptacle having a chamber to receive and collect urine; a drip chamber in fluid communication with the chamber receptacle and having an annular wall with a lower, open peripheral edge defining a valve seat, said seat being disposed at an acute angle relative to a horizontal plane when the receptacle is in an upright position and thus defining an upper seat portion and a lower seat portion; an anti-reflux valve comprising a sheet of flexible material extending over said valve seat, said anti-reflux valve sheet being of sufficiently large dimensions to entirely cover said valve seat, said valve having an upper valve portion, underline and a lower valve portion; and means for retaining said upper valve portion against said upper seat portion and said anti-reflux valve being made of flexible material, such that said lower valve portion flexes away from the lower seat portion when the receptacle is placed in an upright position, and said lower valve portion flexes against the lower seat portion when the receptacle is disposed in a horizontal portion, the retaining means comprising a pair of opposed arcuate retaining arms, each arm having one end secured in a central portion of the drip chamber and extending through central portions of said valve seat and said valve, the arm terminating in an arcuate end engaging against said upper valve portion on the underside thereof and holding it against said upper seat portion.