Needle-less parenteral fluid injector

Details Needle-less parenteral fluid injector Needle-less parenteral fluid injector

1990-05-31

1991-08-20

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604247, 137533, 2511496, A61M 500

Patent

active

050410873

ABSTRACT:
A fluid injector for use with a needle-less syringe or needle-less add-on IV line is disclosed. The injector is connected to a main IV line and has a fluid passageway from the syringe or the add-on IV set to the main IV line. The injector comprises an anti-backflow valve member where the member is movable under fluid pressure alone between a first position where the fluid can flow through the injector and a second position where the fluid cannot flow through the injector. The injector also comprises a valve located near the syringe end of the injector for receiving the fluid from the syringe or the add-on IV line for injection into the main IV line and for preventing air embolus entering into the IV line. The injector permits leaving a single or a group of drug filled syringes on line at all times with a continuously, rapidly flowing IV line and provides instantaneous "on demand" delivery of drugs or fluids from the syringe. The injector also prevents backflow of IV fluid into the syringe and automatically prevents air embolus from entering into the IV line whenever a syringe is removed from it for refilling it or replacing it with one containing another medication. The injector also permits addition of fluids to a continually flowing main IV stream manually, by pushing the plunger of the syringe by hand, mechanically, by using a programmed electronic infusion pump, or simply, by gravity drip from an add-on "piggy-back" IV set.

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patent: 4103686 (1978-08-01), LeFevre
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patent: 4722725 (1988-02-01), Sawyer et al.
patent: 4758224 (1988-07-01), Siposs
patent: 4871353 (1989-10-01), Thomsen

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