All-in one syringe assembly for blood draws and medicine delivery to patients

A syringe assembly comprising:

• a syringe comprising a cylindrical body with a luer at a first end, said luer including an exit opening;
• a plunger unit including an adapter portion and a receiving cavity, a first end of said adapter portion retaining a piston, said plunger unit insertable into a second end of said syringe and slidable within said cylindrical body during which said piston creates a seal with an interior surface of said cylindrical body, said adapter portion including a channel extending along a length thereof to an opening at a bottom of said receiving cavity, said opening for insertion of an intermediary connector or valve into said channel;
• a cannula secured at one end proximate said exit opening of said luer and extending into said piston and extendable into said channel as said plunger unit is inserted farther into said syringe;
• and
• a locking mechanism configured to lock said plunger unit relative to said syringe whereby said plunger unit may not be removed from said syringe, said locking mechanism comprising at least one raised catch integral with an upper surface of a finger grip of said syringe and at least one flange extending outward from an adapter portion of said plunger unit wherein said raised catch is configured to selectively capture and engage said flange based upon rotation of said plunger unit within said syringe when said one or more raised catches are aligned with said one or more flanges.