Self-sealed hypodermic syringe

Details Self-sealed hypodermic syringe Self-sealed hypodermic syringe

1977-08-29

1979-04-10

Yasko, John D.

Surgery

Respiratory method or device

Ozone or ion generation

128221, A61M 500

Patent

active

041483162

ABSTRACT:
A self-sealed hypodermic syringe uses Louis Pasteur's principle of the "tortuous path" to maintain a sterile condition within a medicament chamber contained within the syringe barrel without using airtight seals. A double walled stem cooperates with the barrel to form a rear tortuous path. A needle and hub assembly cooperates with a front bore in the barrel together with an overlying needle sheath and front cap to form a front tortuous path. The front and rear tortuous paths are maintained by a breakable bond between the cap and the stem until the syringe is to be used. Another embodiment includes a pin on the front cap which cooperates with the front barrel bore in place of the needle and hub assembly.

REFERENCES:
patent: 3485239 (1969-12-01), Vanderbeck
patent: 3677245 (1972-07-01), Welch
patent: 3677247 (1972-07-01), Brown
patent: 3820652 (1974-06-01), Thackston
patent: 3828775 (1974-08-01), Armel

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