Hydraulically powered hypodermic injector with adapters for redu

Details Hydraulically powered hypodermic injector with adapters for redu Hydraulically powered hypodermic injector with adapters for redu

1976-12-30

1978-08-01

Michell, Robert W.

Surgery

Truss

Pad

A61M 530

Patent

active

041036840

ABSTRACT:
A hypodermic jet injection device has a reciprocatable piston for discharging fluid from a chamber. A reciprocatable hollow plunger connected to the piston is hydraulically retracted against a spring bias to compress a coil spring. The plunger is hydraulically released to cause discharge of the fluid with maximum initial force and minimum final force determined by characteristics of the spring. An adjustment knob may be rotated to determine precompression of the spring. A first adapter assembly quickly mountable and dismountable on the adjustment knob includes a shaft adjustably positioned axially inside the plunger to limit retraction of the plunger and compression of the spring so that the maximum initial force of fluid discharge is reduced. Another adapter assembly may be used in place of the first adapter assembly and is also quickly mountable and dismountable on the adjustment knob and includes a housing carrying another shaft insertable into the plunger to abut one end thereof. Another coil spring in the housing is axially compressible by the other shaft when the plunger is hydraulically retracted. Both springs are compressed so that the force of fluid discharged is increased when the retracted plunger is hydraulically released.

REFERENCES:
patent: 2472116 (1949-06-01), Maynes
patent: 3057349 (1962-10-01), Ismach
patent: 3353537 (1967-11-01), Knox et al.

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