Patent ID: 9662451
Date: 2017-05-30
CPC Classifications: A61M

Claim:
1. A retrobulbar syringe comprising: an inner syringe having a hollow barrel with a proximal end, a distal end, an outer barrel surface, a plunger in the barrel, and a needle attached to the barrel distal end; an outer syringe having a hollow barrel with a proximal end, a distal end, an barrel inner surface, and a sheath attached to the outer syringe barrel distal end, wherein the inner syringe is at least partially contained in the outer syringe barrel, and wherein the needle is at least partially contained and movable in the sheath; a spring inside the outer syringe barrel bearing against the inner syringe and biasing the inner syringe toward the outer syringe proximal end; a first locking member on the inner syringe barrel outer surface, and a second locking member on the outer syringe barrel inner surface, the first and second locking members being configured and arranged to inhibit the inner syringe from being moved proximally out of the outer syringe barrel; wherein at least one of the first and second locking members comprises a ring extending entirely around the inner syringe barrel or the outer syringe barrel, respectively.