Self-clearing extension set apparatus and methods

Details Self-clearing extension set apparatus and methods Self-clearing extension set apparatus and methods

1993-03-23

1994-01-18

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 27, A61M 500

Patent

active

052795870

ABSTRACT:
A self-clearing extension set comprising a first shunt flow pathway for direct delivery of liquid from a source of pressurized liquid to a patient catheter and a second shunt flow pathway wherein injected fluid is cleared from an add-site to the patient catheter by selectively diverted flow from the source. Two methods and associated apparatus for injecting biologically active liquid and clearing the injected liquid through a smaller lumen of a dual lumen extension tube are disclosed. Two methods for occluding one flow pathway while providing a patent flow pathway through the other flow pathway are also disclosed. Each add-site sealingly accepts a syringe needle which is used to inject biologically active liquid into the second shunt flow pathway. Each add-site comprises a low geometric dead space such that no meaningful quantity of injected liquid remains in the add-site after the rest of the injected bolus of liquid has been cleared to the patient catheter. Novel methods and apparatus for connecting to the dual lumen extension tube, and particularly for connecting to the smaller lumen of the extension tube, are disclosed.

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