subcutaneously implantable vascular access devices allowing repeated percutaneous insertion therein and withdrawal therefrom of one or two large gauge needles necessary for efficient hemodialysis therapy sessions, wherein the device both provides reliable vascular access and securely retains the needle (s) during each treatment session

'access':4,34 'allow':6 'devic':5,29 'effici':23 'gaug':19 'hemodialysi':24 'implant':2 'insert':9 'larg':18 'necessari':21 'needl':20,39 'one':15 'percutan':8 'provid':31 'reliabl':32 'repeat':7 'retain':37 'secur':36 'session':26,44 'subcutan':1 'therapi':25 'therefrom':13 'therein':10 'treatment':43 'two':17 'vascular':3,33 'wherein':27 'withdraw':12

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