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