A medical assembly 27 wherein the slit valve means comprise yieldable diaphragm means in which at least one slit is centrally disposed and flexed by pressure differential, and physical means adjacent to the diaphragm means constraining flexure of the diaphragm means to control {HEAD ~ the pressure differentials} required to open {TAIL ~ the slit} in either direction 
required to open
A medical assembly 27 wherein the slit valve means comprise yieldable diaphragm means in which at least one slit is centrally disposed and flexed by pressure differential , and physical means adjacent to the diaphragm means constraining flexure of the diaphragm means to control { HEAD ~ the pressure differentials } required to open { TAIL ~ the slit } in either direction
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