The present invention relates generally to medical liquid flow in a cannula and more particularly to novel structure and methods for outdwelling selective slit valving of medical liquid flow, including bi direction flow, along {HEAD ~ a cannula}, such as a catheter tube or {TAIL ~ needle}, when the distal end thereof is indwelling in a medical patient 
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The present invention relates generally to medical liquid flow in a cannula and more particularly to novel structure and methods for outdwelling selective slit valving of medical liquid flow , including bi direction flow , along { HEAD ~ a cannula } , such as a catheter tube or { TAIL ~ needle } , when the distal end thereof is indwelling in a medical patient
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