Abstract: An apparatus for atraumatic access to the blood circuit includes a central tubular section connected to two lateral tubular sections. The central section includes a removable head having a blood taking and blood reinjection line, and a pair for obturating the blood flow, which may be activated by a rotation of the removable head through 90.degree.. The two lateral sections are connected to a vein or artery, forming a shunt. A recess in the closure makes it possible to clean and rinse the interior of the access device. The device makes it possible to treat, as often as necessary, an extra-corporal circulation of a patient's blood.

Abstract: A device for a traumatic access to a blood vessel of a living organism through the cutaneous surface thereof. The device includes in combination an implantable device comprising a tubular segment for access to the blood vessel; a valving element for the tubular segment; a mechanism for controlling the blood flow through the valving element; a cover for sealing the proximal end of the tubular segment in the absence of the blood control mechanism; and a porous coating adapted to be colonized by tissue ingrowth and at least partially surrounding the implantable device. The porous coating is formed from a carbon-carbon composite material comprising a reinforcement formed from a carbon fiber porous substrate embedded in a carbonaceous matrix design to densify only partially the fiber substrate while connecting the carbon fibers together.