Abstract: A disposable medical syringe apparatus with retractable needle is disclosed. The spent needle, or other similar medical sharps device, affixed to a detachable needle hub on the syringe barrel may be safely encapsulated and disposed by a simple, one handed operation, and, both the needle and the syringe apparatus are rendered useless for any subsequent operation. The invention is comprised of two parts, a syringe barrel fitted with a detachable needle hub and an evacuated plunger fitted with a combination catch ring/air release/vacuum seal mechanism that readily permits the introduction of the vacuum into the hollow chamber of the plunger. The syringe apparatus is used in the standard manner for an injection of medicinal liquid or for the collection of blood or other body fluids. When use is complete, continued longitudinal axial force is applied to the distal (thumb) end of the evacuated plunger.