Patent ID: 7291128

Claim:
A medical assembly comprising a short catheter, a puncturing needle engaged in the catheter to enable the catheter to be inserted into a body, and a tubular sheath detachably coupled to the catheter to receive the entire needle after the needle has been used for puncturing and once it has been withdrawn from the catheter, the sheath presenting a longitudinal slot between a distal outlet end for coupling to the catheter and an opposite proximal end, and carrying a slider mounted to slide along the slot to control said withdrawal of the needle, the slider presenting an internal portion situated inside the sheath and constituting a base for the needle, and an external portion situated on the sheath and enabling the slider to be pushed manually to cause to it to slide towards said proximal end to a proximal position in which the needle is fully withdrawn into the tube, the sheath comprising a stationary deflector disposed inside the sheath on the path of the slider close to the end of the stroke of the slider towards said proximal end of the sheath, so that contact between the slider and the deflector causes the slider to be inclined and consequently causes the needle to be inclined inside the sheath, and resilient return means provided so as to push the inclined slider back in the opposite direction by a resilient effect until the tip of the inclined needle becomes set in a wall at the distal end of the sheath.