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 {HEAD ~ physical means} adjacent to {TAIL ~ the diaphragm} means constraining flexure of the diaphragm means to control the pressure differentials required to open the slit in either direction 
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 { HEAD ~ physical means } adjacent to { TAIL ~ the diaphragm } means constraining flexure of the diaphragm means to control the pressure differentials required to open the slit in either direction
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