Patent ID: 7396342

Claim:
A safety syringe for taking blood comprising: a hollow barrel having a bottom open end, a top end, a rectangular hole defined in the top end to have two opposite long sides, two opposite short sides, and a stop formed on a side face of the top end; a needle hub detachably connected to at least one of the long sides of the rectangular hole and having a first needle extending from an elliptical body into an interior of the hollow barrel and a second needle extending away from the hollow barrel; a cap rotatably connected to the top end of the hollow barrel and having a notch defined through a periphery of the cap to receive therein the elliptical body so that the second needle extends out of the cap after in combination with the cap and the cap further having a guiding recess defined in an inner periphery thereof to correspond to and receive therein the stop to ensure smooth rotation of the cap relative to the hollow barrel; and an enclosure detachably enclosing the second needle for protection, whereby rotation of the cap as well as the needle hub aligns long sides of the elliptical body with the long sides of the rectangular hole such that the elliptical body together with the first needle and the second needle is able to extend into the interior of the hollow barrel for storage.