Patent ID: 8075529

Claim:
An indwelling needle assembly usable in combination with an infusion system for infusion into a patient's body, the indwelling needle assembly comprising: a needle having a needlepoint insertable into the patient's body; a sleeve slidably fitted on the needle; a catheter including a catheter tube slidably fitted on the sleeve; a base body fixed to a proximal end of the needle; and a slider fixed to the sleeve and slidably engaged with the base body so as to be movable between a first position to have the needlepoint projecting out of the sleeve and a second position to have the needlepoint retracted in the sleeve, wherein the needle, the sleeve, the base body and the slider are unitarily extractable from the catheter, wherein the sleeve includes an obliquely cutoff flat end, and the obliquely cutoff flat end projects from the catheter toward the needlepoint, and wherein the catheter includes a distal end portion directly fitted on the needle, and a taper portion continuously tapering from the catheter tube toward the distal end portion.