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US 5,176,653 AGranted
Improvements to implantable vascular access devices
OwnerJoel Metalsinventor
Life of this patent
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Abstract
Telescopic needles permit the perforation of implantable vascular accesses sealed by means of a flexible elastomeric membrane using needles of large diameter. The telescopic needles in order of increasing diameter, permit progressive perforation with widening of the orifice formed in the septum, with only the nozzle of greatest diameter remaining through the septum at the end of the operation. The invention extends the area of application of implantable vascular access devices.
Claims7
An implantable vascular access device comprising:
- at least one chamber in communication with a vascular access;
- at least one septum closing an upper face of said chamber;
- said septum including means for permitting spatially and temporally a plurality of perforations by a needle;
- said septum comprising a plurality of superimposed layers of silicone leaves compressed together, said layers including between each pair thereof a film of a product for self-closing said perforations;
- said needle including at least one fine, sharp-pointed introducing and guiding mandrel;
- a nozzle of appropriate diameter slidably mounted in a telescopic manner on said mandrel;
- said nozzle having a chamber in a rearward portion thereof;
- said chamber being sealed on a face thereof by a perforatable membrane through which said mandrel can pass;
- said perforatable membrane being directed essentially perpendicular to an axis of said nozzle;
- said chamber being connected to an external apparatus;
- and
- said mandrel disposed to be withdrawn rearward after a positioning of said nozzle through said septum.
9 more elements
An implantable vascular access device comprising:
- a septum implanted under the skin;
- said septum including means for permitting spatially and temporally a plurality of perforations by a needle;
- said septum comprising a plurality of superimposed layers of silicone leaves compressed together, said layers including between each pair thereof a film of a product for self-closing said perforations;
- said septum having a chamber;
- said chamber having a bottom surface;
- and
- said bottom surface including ribs.
4 more elements
Dependencies are inferred from the claim text.