Subcutaneous venous access device and needle system
First Claim
1. In a subcutaneous venous access system ofa port device defining a chamber with a septum for allowing a needle input into the chamber and a catheter output from the chamber:
- a needle assembly having a shaft section and a point, means for allowing the non-coring entry of the needle point through skin and the septum and which, when seated in the chamber, has a shaft segment which extends through the septum and into the chamber; and
means for providing a changed outside diameter portion of the outside surface of the shaft in said segment;
whereby said needle assembly may be seated into the chamber of the port device and said changed diameter section serve to prevent or reduce the possibility of said needle being unintentionally removed from the chamber and septum during use.
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Accused Products
Abstract
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 but 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.
276 Citations
16 Claims
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1. In a subcutaneous venous access system of
a port device defining a chamber with a septum for allowing a needle input into the chamber and a catheter output from the chamber: -
a needle assembly having a shaft section and a point, means for allowing the non-coring entry of the needle point through skin and the septum and which, when seated in the chamber, has a shaft segment which extends through the septum and into the chamber; and means for providing a changed outside diameter portion of the outside surface of the shaft in said segment; whereby said needle assembly may be seated into the chamber of the port device and said changed diameter section serve to prevent or reduce the possibility of said needle being unintentionally removed from the chamber and septum during use. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A needle apparatus for use with a subcutaneous venous access device of a type having a needle entry septum of a predetermined thickness and a chamber thereunder of a set depth under the septum, comprising:
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a needle shaft defining a fluid passageway to a needle point, said shaft having a section from the point rearward of a length equal to this set depth and the predetermined thickness, said shaft having an approximately constant diameter over the majority of its length; a non-coring needle point formed at the end of said shaft; and means for providing a different outside surface configuration of said shaft at said section for aiding in releasably securing the needle apparatus in said device when said needle point is driven into and through said septum and into said chamber for a distance. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification