Patent ID: 7322963
Filing Date: 2008-01-29
Classification: A61M

Abstract:
1. A telescopic winged safety needle assembly, comprising: a hub having a distal end, a proximal end, and an axial through hole; a cannula joined to said hub adjacent the distal end of the hub; a cylindrical sleeve having a locking tab attached thereto, said cylindrical sleeve being axially disposed on said hub; a cylindrical sheath for retaining said hub therein and having a distal end and a proximal end, said hub being slidable along an inner surface of said cylindrical sheath and an inner surface of said cylindrical sleeve from a first telescopic position at which the distal end of said cannula joined to said hub projects beyond the distal end of said cylindrical sheath by a predetermined length, to a second telescopic position at which said distal end of the cannula is protectively contained within said cylindrical sheath, said cylindrical sleeve being axially disposed on said proximal end of said cylindrical sheath; a pair of flexible wings provided on the outer peripheral surface adjacent the distal end of said cylindrical sheath; and a first locking mechanism and a second locking mechanism disposed on said assembly, said first locking mechanism releasably locks said hub, said cylindrical sleeve, and said sheath at the first telescopic position, and said second locking mechanism unreleasably locks said hub, said cylindrical sleeve, and said cylindrical sheath at the second telescopic position, wherein said second locking mechanism comprises a first annular ring and a second annular ring provided on the exterior distal end of said hub, an annular ring provided on the interior proximal end of said cylindrical sleeve, a first lug and a second lug provided on the proximal exterior end of said cylindrical sheath, and a first annular ring and a second annular ring provided on the interior distal end of said cylindrical sleeve, wherein when said hub, said cylindrical sleeve, and said cylindrical sheath are located at the second telescopic position, said first annular ring and said second annular ring provided on the exterior distal end of said hub unreleasably engage said annular ring provided on the interior proximal end of said cylindrical sleeve, and said first lug and said second lug provided on the proximal exterior end of said cylindrical sheath unreleasably engage said first annular ring and said second annular ring provided on the interior distal end of said cylindrical sleeve.