Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-09-11
1996-10-08
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604263, A61M 500
Patent
active
055626262
ABSTRACT:
A safety syringe having a sheath that automatically extends over the needle of the syringe after the syringe is used to administer an injection. The safety sheath that extends over the needle of the syringe is stored in a retracted position around the exterior of the syringe barrel. Locking pawls extend from the sheath and engage the syringe barrel thereby retaining the sheath in the retracted position. A spring element is disposed between the syringe barrel and the sheath, wherein the spring is compressed when the sheath is in its retracted position. As an injection is made and a plunger assembly is advanced within the syringe barrel, a trigger flange on the plunger assembly displaces the locking pawls, thereby releasing the lock between the syringe barrel and the sheath. With the release of the locking means that retains the sheath, the bias of the compressed spring moves the sheath forward on the syringe barrel. The sheath comes to rest at an orientation where the sheath extends beyond the needle of the syringe, thereby protecting the needle from accidental contact. A second locking mechanism then locks the sheath into the extended position, preventing the syringe from being reused.
REFERENCES:
patent: 5282793 (1994-02-01), Larson
patent: 5318538 (1994-06-01), Martin
patent: 5367080 (1994-12-01), Petrussa
patent: 5411487 (1995-05-01), Castagna
patent: 5417660 (1995-05-01), Martin
patent: 5433712 (1995-07-01), Stiles et al.
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