Surgery – Respiratory method or device – Ozone or ion generation
Patent
1975-01-22
1976-01-27
Michell, Robert W.
Surgery
Respiratory method or device
Ozone or ion generation
128218C, 222 47, A61M 100
Patent
active
039345866
ABSTRACT:
A multiple dosage syringe comprises a hollow barrel through which a piston slides by being pushed by a piston member protruding from the rear of the barrel so that liquid material within the barrel is discharged through a discharge member at the front end of the barrel. A plurality of longitudinally spaced stops protrude outwardly from the perimeter of the piston member which protrudes from the rear of the barrel so that the foremost stop abuts a flange at the rear of the barrel. To discharge a dosage this stop is broken off along a line of maximum weakness so that the stop can enter the barrel during the discharge of the dosage which is completed when the next stop strikes the flange. This process is repeated for each dosage. The line of maximum weakness extends obliquely from the junction of the forward end of the stop with the exterior of the piston member and is spaced somewhat away from the outer surface of the piston member at the rear, so that the outer part of the stop will break off along this line of weakness. The rear part of the stop is undercut inside the line of breaking off so that there is left a sharp edge which acts to score the inner surface of the barrel during progress through the barrel so that the barrel is not re-useable for another filling of liquid material.
REFERENCES:
patent: 2474496 (1949-06-01), Rayman
patent: 2764981 (1956-10-01), Helmer et al.
patent: 2844148 (1958-07-01), Raife
patent: 2869541 (1959-01-01), Helmer et al.
Easton Fred H.
Helmer N. Donald
Michell Robert W.
Mon Donald D.
Yasko J.
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