Safety syringe for fluid collection

Details Safety syringe for fluid collection Safety syringe for fluid collection

1996-11-14

1998-12-08

Buiz, Michael Powell

Surgery

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

Treating material introduced into or removed from body...

604194, A61M 532

Patent

active

058462287

ABSTRACT:
The invention comprises a safety syringe having a barrel containing a fluid receiving cavity, a plunger, a needle and a blunt sheath. The needle is connected to the plunger so that when the plunger is retracted, the needle is retracted. The sheath extends from the barrel and is circumferentially positioned about the needle. When fully extended, the sharp end of the needle extends from the sheath, but upon retraction, the sheath covers the sharp end. The external diameter of the sheath is sized to allow the sheath to be inserted hypodermically with the needle. Upon insertion of the needle and sheath into the patient, the plunger may be withdrawn. This will create a vacuum and will cause the needle to be retracted into the sheath. Fluids will flow through the sheath and the needle into the fluid receiving cavity because of the vacuum. When fluid collection is complete, the syringe may be withdrawn with the needle already safely encased in the blunt sheath. Fluids may be expelled from the syringe through the needle and the sheath by depressing the plunger. A locking device stops the needle from advancing beyond the end of the sheath, preventing both reuse and accidental sticks without interfering with the expulsion of fluids.

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U.S. Ser. No. 08/727,756, Alexander, filed Oct. 8, 1996.

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