Protection device for syringe needle

A device for protecting a syringe needle comprising an elastic needle cap of generally longitudinal direction presenting a closed distal end and an open proximal end, said cap being formed by a lateral wall extending from said proximal end along a proximal end zone, defining an inner housing adapted to receive the distal part of the body of a needle syringe, and by an end wall whose thickness extends from said distal end along a distal end zone, said end wall being capable of being pierced through a part of its thickness by the free end of said needle,

• said housing comprising, from said proximal end:
• an opening presenting a maximum diameter,
• a first portion of truncated or cylindrical shape, of circular cross-section,
• a second cylindrical portion of circular cross-section presenting a diameter smaller than said maximum diameter and intended to house the distal part of the syringe body which bears said needle, and
• a third portion which narrows from said second portion in the direction of a back of said housing,
• wherein said lateral wall is further provided with an annular bead disposed in said housing between said first and second portions of said housing, at least one slot extending longitudinally in said annular bead.