Hypodermic syringe

Details Hypodermic syringe Hypodermic syringe

1982-03-31

1984-03-27

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

A61M 500

Patent

active

044391870

ABSTRACT:
An improvement for use with a particular type of hypodermic syringe having a non-retractable stopper located ahead of the drive piston so that the position of the non-retractable stopper indicates the extent to which the drive piston has been advanced. The improvement is a substantially opaque sleeve, or coating applied to the transparent tubular body of the syringe, or a substantially opaque section of the tubular body itself, that is positioned to obstruct the user's view of the non-retractable stopper when the latter is in its original position as supplied by the manufacturer. The front end of the sleeve, coating, or section coincides axially with the front end of the non-retractable stopper so that any forward movement of the non-retractable stopper will expose to view a portion of the non-retractable stopper.

REFERENCES:
patent: 1747243 (1930-02-01), Hoskins
patent: 2020828 (1935-11-01), Goldberg
patent: 3126004 (1964-03-01), Sarnoff
patent: 3366113 (1968-01-01), Hobbs
patent: 3485239 (1969-12-01), Vanderbeck
patent: 3677247 (1972-07-01), Brown
patent: 3754644 (1973-08-01), Hampel
patent: 3941129 (1976-03-01), Pleznac
patent: 4014331 (1977-03-01), Head
patent: 4048997 (1977-09-01), Raghavachari et al.

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