Patent ID: 9186483
Filing Date: 2015-11-17
Classification: A61M

Abstract:
1. An indwelling assembly comprising: an inner needle having a sharp needlepoint at a distal end to puncture a blood vessel of a patient when the indwelling assembly is moved toward the patient, the inner needle possessing a proximal portion; an inner needle hub fixed to the proximal portion of the inner needle; a hollow elongated outer member in which the inner needle is positioned, the hollow elongated outer member being movable in a distal direction relative to the inner needle after puncturing the patient's blood vessel with the sharp needlepoint to position the hollow elongated outer member at a desired position in the blood vessel, the hollow elongated outer member possessing a distal end and a proximal end, the hollow elongated outer member possessing a proximal portion; an outer member hub fixed to the proximal portion of the hollow elongated outer member; an elongated contact member axially overlapping a part of the hollow elongated outer member that extends from the outer member hub toward the distal end of the hollow elongated outer member, the elongated contact member being configured to contact an intermediate portion of the hollow elongated outer member located between the proximal and distal ends of the hollow elongated outer member while moving the indwelling assembly toward the patient to puncture the patient's blood vessel with the sharp needlepoint of the inner needle; an elongated movable member that is movable relative to the hollow elongated outer member and the outer member hub, the elongated movable member being connected to the inner needle hub so that the inner needle hub, the inner needle and the elongated movable member move together, the elongated movable member projecting in the distal direction from the inner needle hub; portions of the elongated movable member, the elongated contact member, the hollow elongated outer member and the inner needle axially overlapping one another; the elongated movable member being movable together with the inner needle hub and the inner needle in a proximal direction relative to the hollow elongated outer member and the outer member hub after the hollow elongated outer member is positioned in the patient's blood vessel to remove the inner needle from the patient's blood vessel while the hollow elongated outer member remains positioned in the patient's blood vessel and to entirely remove the inner needle from the hollow elongated outer member; at least a portion of the elongated movable member being U-shaped in transverse cross-section so that the portion of the elongated movable member is open along one longitudinally extending side, the U-shaped portion of the elongated movable member axially overlapping a portion of the inner needle; the U-shaped portion of the elongated movable member extending from the inner needle hub in the distal direction; and the elongated contact member covering the longitudinally extending open side of the U-shaped portion of the elongated movable member so that the elongated movable member and the elongated contact member enclose a space in which the inner needle is positioned.