Hand-held pneumatic power assisted syringe

Details Hand-held pneumatic power assisted syringe Hand-held pneumatic power assisted syringe

1988-10-17

1989-08-29

Kruter, Jerome L.

Surgery

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

Treating material introduced into or removed from body...

A61M 3700

Patent

active

048613401

ABSTRACT:
A hand-held manually operable-pneumatic power assisted syringe serves for injection of fluids. The syringe includes a barrel-shaped housing having a piston slidably mounted therein between the distal and proximal ends of the housing and dividing the housing into a fluid chamber at the distal end and a gas chamber at the proximal end. A nozzle is mounted on the distal end of the housing and is provided with a discharge passageway for discharging fluid from the fluid chamber as the piston is displaced toward the distal end. A piston push rod extends from the piston and is slidable through an end cap mounted on the proximal end of the housing with the push rod serving to displace the piston in the distal direction. The push rod is hollow and has a first passageway at a location adjacent the piston for communication with the gas chamber and a second passageway at a location exterior of the housing for communication with a source of pressurized gas to thereby fill the gas chamber with pressurized gas. A valve assembly is carried by the push rod and includes a bobbin slidably mounted within the push rod between a normal valve closed position for blocking the second passageway to a valve open position for permitting gas to flow through the second passageway into the push rod and then to the gas chamber.

REFERENCES:
patent: 3688765 (1972-09-01), Gasaway
patent: 4093108 (1978-06-01), Hein et al.

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