Retractable needle apparatus

This invention refers to a retractable safety needle comprising: a needle hub (36), a needle cannula (34), said proximal end of said needle cannula (34) being securely mounted in said passage at said distal end of said needle hub (36); a resiliently deflectable actuator arm (60) extending from said needle hub (36), an actuator button being formed on said actuator arm (60) and projecting outwardly relative to said needle hub (36); a barrel (20,22), said needle hub (36) being disposed in said passage of said barrel (20,22) such that said needle hub (36), said needle cannula (34) and said actuator arm (60) are moveable relative to said barrel (20,22) from a distal position where said needle cannula (34) projects distally beyond said barrel (20,22) and a proximal position where said needle cannula (34) is disposed entirely in said barrel (20,22), said barrel (20,22) having an actuating opening extending therethrough, said actuator button projecting into said actuating opening when said needle hub (36) is in said distal position, said actuator button being resiliently deflectable out of engagement with said actuating open; and a spring (18) disposed in said barrel (20,22) for propelling said needle hub (36) to said proximal position when said actuator button is deflected out of said actuating aperture; wherein said hub (36) and barrel (20,22) are formed from a translucent material to provide a venous indication.