Patent ID: 6638254
Filing Date: 2003-10-28
Classification: A61M

Abstract:
An indwelling needle assembly comprising an outer needle to pierce and be retained in tissue of a living body; an outer needle hub having a distal end portion to which the outer needle is fixed; an inner needle slidably inserted in a lumen of the outer needle and having a sharp blade edge at a distal end portion thereof; an inner needle hub having a distal end portion to which the inner needle is fixed; a needle guard of a multi-tube structure which comprises a plurality of telescoping tubes and is capable of accommodating the inner needle and the inner needle hub therein; a first elastic means provided on the needle guard for extending the plurality of telescoping tubes so as to lengthen the needle guard; a second elastic means which engages the inner needle hub and is capable of biasing the inner needle hub toward a proximal end side of the needle guard; and a stopper means capable of holding the inner needle hub and the needle guard against biasing forces of the first and second elastic means, respectively.