Back to results
US 5,346,475 AGranted
Single use syringe
OwnerEdward Gregorioinventor
Life of this patent
Estimating the term…
Abstract
A single-use syringe for covering its needle after injection of a medical preparation. The syringe has a barrel and has a non-reversible shield for covering the needle. The shield has an inclined interior shield tooth of resilient material, and the barrel has a coacting inclined exterior row of teeth of non-resilient material, whereby the shield tooth locks behind a barrel tooth when the needle is covered and the shield cannot reverse its travel.
Claims3
A single use syringe comprising:
- a barrel having an axis and having an end needle and having a coaxial plunger;
- a protective shield slidably engaging and supported on the barrel for covering the needle after needle use;
- and
- a non-reversible lock unit for locking the shield in place to the barrel after covering the needle wherein the lock unit includes at least one lock subassembly comprising:
- at least one axial parallel row of barrel teeth fixedly connected to the barrel at an outer surface of the barrel;
- and
- at least one shield tooth fixedly connected to the shield at an interior surface thereof;
- said shield tooth being a resilient spring-like tooth and being inclined in a rearward direction away from the needle for locking in front of a tooth at the front of the row of barrel teeth when the shield is in a needle-covering position, wherein
- the shield has a slot disposed parallel to the axis for travel therethrough of the row of barrel teeth;
- the shield has a bubble-like wall extension disposed over and covering over the slot;
- and
- a bar is provided on the barrel to maintain the cover in a spaced relationship between the barrel and the cover.
9 more elements
Dependencies are inferred from the claim text.