| 摘要 |
A T-shaped blood access device which is adapted for implantation into a patient and which has its stem portion extending outwardly above the skin of the patient. An elastomeric septum is positioned in sealing relationship in the stem adjacent the junction with the main conduit portion. The septum is compressed between a support extension within the device stem and a pressure plate above the septum. The septum is provided with pre-formed openings therethrough to provide a resealable pathway for a needle pair. The septum may have a concave edge to facilitate sealing along the interior device edges and to accommodate laterally displaced septum material during needle insertion. A needle assembly which includes a pair of round ended needles with side openings is preferably used with the T-shaped device. The needle assembly may include a pair of spring loaded sleeve members which normally surround the needles so as to cover the needle side openings during insertion through the septum but which expose the openings as the needles are pushed further downward into the blood stream. A cavity above the septum and a cooperating flanged snap-on cap are provided for keeping the assembly sterile between uses by use of a sterilizing fluid. The arms of the T may be connected directly to the circulatory system or by means of an intermediate polymeric vascular graft.
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