Hypodermic injection device

Details Hypodermic injection device Hypodermic injection device

1990-03-16

1991-10-29

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604110, A61M 532

Patent

active

050612492

ABSTRACT:
Disclosed is a hypodermic injection device wherein the needle can be retracted into the reservoir chamber, after use, for disposal. The device includes a plunger having a needle-retention chamber in the end of the plunger closest to the needle structure. The end portion of the needle can be resilient, and shaped, such that the end of the needle can be retained in the needle-retention chamber when the plunger reaches the end of its stroke toward the needle. Other structures for ensuring retention of the needle is the needle-retention chamber are also disclosed. Also disclosed is structure for ensuring that the needle cannot be relocated for re-use, once it has been withdrawn into the reservoir chamber, and structure avoiding accidental retention of the needle in the needle-retention chamber.

REFERENCES:
patent: 2840075 (1955-06-01), Dann et al.
patent: 4692156 (1987-09-01), Haller
patent: 4803370 (1989-02-01), Haber et al.
patent: 4944723 (1990-07-01), Haber et al.

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