Vascular access device, in particular for purification treatments of the blood

Claim 1

A vascular access device, comprising: a case designed to be grafted permanently in living tissue and having a pair of connections for blood vessels, the connections being structured to couple with respective ends of at least one cut blood vessel, the case having an outer surface covered with a first layer of damping material on which is arranged a second layer of biocompatible material weldable to the living tissue; a two-position valve removably housed in said case and a pair of access ports for removal means and admission means for blood, the valve being a rotary valve having two independent passages wherein, in a first rotational angular position of the valve the passages establish connection between a first of the connections and a first of the access ports and between a second of the connections and a second of the access ports, respectively, and in a second rotational angular position of the valve the passages establish connection between said first and second connections and between said first and second access ports, respectively, said access ports being formed in a retaining element for said valve and being connected to the passages by unions formed in the case, the retaining element being removably locked by a ringnut screwed onto the case; and, a plate having two portions, each of the portions having an upper sleeve and a lower sleeve, said upper sleeves being structured to receive said removal means and said admission means for the blood and said lower sleeves being structured to penetrate said access ports, the plate being lockable on the vascular access device by a shaped ring threadable onto the case.