| 摘要 |
A system of a subcutaneous venous access device or injection port and needle, wherein the port includes a self-closing septum for repeatedly and periodically receiving a predetermined section of an injection needle, and which septum covers an injection-receiving chamber in communication with a vein. The needle has a non-coring (e.g., "Huber" or removable stylet) point and means for providing a locking configuration such as increased diameter bu smooth outer surface of the needle port-received section, which, when properly inserted, is within the septum or chamber, so as to more securely affix the needle within the port and prevent or decrease the incidence of accidental partial or total removal and the resulting undesirable subcutaneous infiltration of chemicals during infusion. The locking configuration means is, in one embodiment, an expansion section which is maintained (and returned) to a non-expanded configuration by use of a needle core or stylet and which section automatically expands upon removal of the stylet. A second embodiment employs a balloon segment of the needle which is manually inflated in the chamber after setting of the needle in the port. A third and fourth embodiment provide permanent, multi-ridged surfaces which cooperate with the septum to secure the needle in its proper position.
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