Indwelling needle assembly
AssigneeNipro Corporation
InventorHiroyuki Nakagami
Life of this patent
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Abstract
An indwelling needle assembly having an outer needle to be pieced and retained in tissue of a living body, an outer needle hub 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, an inner needle hub to which the inner needle is fixed, and a needle guard having a multi-tube structure composed of a plurality of telescoping tubes and capable of accommodating the inner needle and the inner needle hub therein. The assembly has a first elastic means provided in the needle guard for withdrawing the tubes, a second elastic means that engages with the inner needle hub and biases the hub toward the proximal end of the guard, and a stopper means that holds the inner needle hub and the needle guard against biasing forces of the elastic means.
Claims6
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.
Dependencies are inferred from the claim text.