A safety needle device, comprising: a housing configured to couple to a syringe, the housing having a proximal end, a distal end, and a housing body; a first guide path, a second guide path and a third guide path disposed on the housing body, the second guide path intersecting the first guide path and the third guide path, the first guide path and the third guide path parallel to a central axis which extends along the housing body; a needle hub disposed on the proximal end of the housing; a needle cannula attached to the needle hub; a retractable sheath having a rotating cam configured to move between an initial position, a retracted position and an extended position with respect to the housing, the first guide path and the second guide path disposed on the housing body configured to receive the rotating cam, wherein the retractable sheath rotates with respect to the housing during movement from the initial position to the retracted position; a first locking element, the first locking element comprising a tab on a distal end of the retractable sheath and a locking rib on the housing, a second locking element; the rotating cam disposed in the housing body; and a spring element; characterized in that: wherein the initial position partially exposes a distal tip of the needle cannula, the retracted position fully exposes the needle cannula, and the extended position fully covers the distal tip of the needle cannula, wherein movement of the retractable sheath from the initial position to the retracted position engages the locking rib of the housing to the tab on the distal end of the retractable sheath, thereby preventing further rotation of the rotating cam and thus preventing the guide member from returning to the first guide path; wherein movement of the retractable sheath from the retracted position to the extended position engages the second locking element to a distal tip of the needle cannula, wherein the second locking element inhibits reuse of the safety needle device by inhibiting translation of the retractable sheath. a housing configured to couple to a syringe, the housing having a proximal end, a distal end, and a housing body; a first guide path, a second guide path and a third guide path disposed on the housing body, the second guide path intersecting the first guide path and the third guide path, the first guide path and the third guide path parallel to a central axis which extends along the housing body; a needle hub disposed on the proximal end of the housing; a needle cannula attached to the needle hub; a retractable sheath having a rotating cam configured to move between an initial position, a retracted position and an extended position with respect to the housing, the first guide path and the second guide path disposed on the housing body configured to receive the rotating cam, wherein the retractable sheath rotates with respect to the housing during movement from the initial position to the retracted position; a first locking element, the first locking element comprising a tab on a distal end of the retractable sheath and a locking rib on the housing, a second locking element; the rotating cam disposed in the housing body; and a spring element; characterized in that: wherein the initial position partially exposes a distal tip of the needle cannula, the retracted position fully exposes the needle cannula, and the extended position fully covers the distal tip of the needle cannula, wherein movement of the retractable sheath from the initial position to the retracted position engages the locking rib of the housing to the tab on the distal end of the retractable sheath, thereby preventing further rotation of the rotating cam and thus preventing the guide member from returning to the first guide path; wherein movement of the retractable sheath from the retracted position to the extended position engages the second locking element to a distal tip of the needle cannula, wherein the second locking element inhibits reuse of the safety needle device by inhibiting translation of the retractable sheath. wherein the initial position partially exposes a distal tip of the needle cannula, the retracted position fully exposes the needle cannula, and the extended position fully covers the distal tip of the needle cannula, wherein movement of the retractable sheath from the initial position to the retracted position engages the locking rib of the housing to the tab on the distal end of the retractable sheath, thereby preventing further rotation of the rotating cam and thus preventing the guide member from returning to the first guide path; wherein movement of the retractable sheath from the retracted position to the extended position engages the second locking element to a distal tip of the needle cannula, wherein the second locking element inhibits reuse of the safety needle device by inhibiting translation of the retractable sheath.