US Patent 7238169 Safety indwelling needle

A safety indwelling needle including an inner needle unit 1 having an inner needle 8, an inner needle hub 14 and a housing member 13 disposed at a distal side of the inner needle hub 14, and an outer needle unit 2 having an outer needle 4, an outer needle hub 5 and an outer needle cap 9, characterized in that the housing member 13 includes openings for allowing penetration of the inner needle 8 at a distal end and a proximal end thereof, an internal space for storing only a distal end portion of the inner needle 8 including a needlepoint 3 thereof when the inner needle 8 is drawn out from the outer needle 4, and a shielding member which automatically closes the opening at the proximal end of the housing member 13 by a magnetic force.