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System for preventing needle displacement in subcutaneous venous access ports
| Details |
Inventors: Wenner, Donald E.; Scott, III, George L.;
Assignee:
Primary Examiner: Yasko; John D.
Assistant Examiner:
Attorney, Agent or Firm: Hoffman; Louis J.
A threaded, dual needle system is securely attached to a modified subcutaneous venous access port having an internal reservoir, used for intravenous drug therapy particularly in human cancer treatment. A hollow outer needle is paired with a removable, male-threaded solid inner point and inserted through the patient's tissue and through the port's protective, self-sealing silicon septum, and the solid inner needle is then removed, while the outer needle is left in place. Next, a hollow inner needle is threaded through the outer needle to a depth sufficient to interlock with a female-threaded port receptacle at the base of the port's fluid reservoir and rotated to install. Optional additional threading can permit securing the outer needle to the two inner needles. A breakaway system prevents displacement from unintended pulling of the flow-line. The system thus provides additional protection against needle displacement from venous access ports, the resulting leakage, and the problems caused thereby. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a safer system of providing repeated intravenous drug therapy.
It is another object of the invention to provide a venous access port useful in preventing subcutaneous infiltration of chemicals.
It is another object of the invention to reduce the probability of needle displacement from venous access ports.
It is another object of the invention to reduce toxicity and necrosis of tissues caused by needle displacement from venous access ports.
It is another object of the invention to reduce the likelihood of thrombosis caused by needle displacement from venous access ports.
It is another object of the invention to provide a venous access port having an improved dual-needle system.
It is another object of the invention to prevent needle displacement from excessive or unintended pulling on the flow-line to a venous access port.
It is another object of the invention to provide a breakaway section in the flow-line to a venous access port, having a ball valve to prevent discharge of drugs or bodily fluids.
The inventive apparatus and method achieves those and other objects of the invention by the use of a securely attached, threaded, dual needle system in conjunction with a modified subcutaneous port.
An embodiment of the invention, illustrated in the drawings, comprises a hollow outer needle having a smooth exterior and internal threading, which is designed to interlock with a removable, oppositely threaded solid inner point, which in one embodiment includes small cutting blades located above the pointed tip.
After the outer needle with interlocked solid internal needle is inserted as a unit through the patient's tissue and through the port's protective silicon septum, the solid inner needle is unscrewed and removed, while the outer needle is left in place.
Next, a hollow inner needle is inserted through the outer needle to a depth sufficient to interlock with a female-threaded port receptacle at the base of the port's fluid reservoir, and the inner needle is rotated to install
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Heart Surgery 
