Patent ID: 9155845
Filing Date: 2015-10-13
Classification: A61M

Abstract:
1. A retractable safety syringe apparatus, comprising: a syringe body defining a distal end, a proximal end and an inner surface; a plunger having a piston slideably disposed within the syringe body and a shaft extending through the proximal end; a distal seal disposed between the plunger piston and the syringe body forming a fluid tight seal between the plunger piston and the syringe body; a threaded adapter releasably engageable to the distal end of the syringe body by threading the adapter on to the distal end of the syringe body; a needle holder being removeably engageable to the adapter and engageable to the piston: the adapter positioned retaining the needle holder from the distal side of the needle holder; a release element disposable between the needle holder and the adapter removeably engaging the needle holder to the adapter prior to a release of fluid from the syringe, the release element frictionally engaged to the needle holder and the adapter defining a retaining force and moveable between the needle holder and the adapter when force is applied; wherein the piston is biased toward a retracted position via a retraction force greater than the retaining force withdrawing the needle holder into the syringe body when the piston is engaged to the needle holder.