Injection device

Details Injection device Injection device

1974-08-08

1976-03-23

Michell, Robert W.

Surgery

Truss

Pad

A61M 530

Patent

active

039453790

ABSTRACT:
A pressure operated injection device supports an ampul containing a plunger. A ram which actuates the plunger is spring biased to a retracted position and is advanced by a gas under pressure. A source of gas under pressure is connected by a passage to a gas accumulating chamber which in turn is connected by a passage to the ram with a valve being provided in each passage. The valves admit gas to the ram from the accumulating chamber at a predetermined pressure and simultaneously prevent the admission of any further gas from the source of gas and, at a substantially lower pressure, close the passage connecting the accumulating chamber and the ram. The device is constructed to exhaust gas to the atmosphere from the ram as it retracts and a manually controlled valve controlling the flow of gas from the source to control the operation of the device.

REFERENCES:
patent: 2605763 (1952-08-01), Smoot
patent: 2653602 (1953-09-01), Smoot
patent: 3515130 (1970-06-01), Tsujino
patent: 3561443 (1971-02-01), Banker
patent: 3752368 (1973-08-01), Robertson

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