Gordon K Wong

US Patent:

50410873, Aug 20, 1991

Filed:

May 31, 1990

Appl. No.:

7/531864

Inventors:

George D. H. Loo - Beverly Hills CA
Gordon A. Wong - Sacramento CA

International Classification:

A61M 500

US Classification:

604 83

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.

US Patent:

51279045, Jul 7, 1992

Filed:

Apr 2, 1990

Appl. No.:

7/503278

Inventors:

George D. H. Loo - Beverly Hills CA
Gordon A. Wong - Sacramento CA

International Classification:

A61M 500

US Classification:

604 83

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 along between a first position where the fluid cannot flow through the injector and a second position where the fluid can flow through the injector. The member is a sinking type and has a specific gravity greater than 1. 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 automatically preventing air embolus entering into the IV line. The anti-air embolus valve comprises a piston in a conduit. The piston is movable between a first position and a second position.