Indwelling needle device

An indwelling needle device comprising:

• a shield tube in a substantially cylindrical form;
• a flexible outer needle fixed at a front end part of the shield tube;
• a hub inserted in a lumen of the shield tube so as to be movable in an axis direction, an infusion tube being attached to a rear end of the hub;
• and
• a rigid inner needle that is fixed at a front end part of the hub and that is insertable into a lumen of the outer needle,
• whereby when the hub is positioned in a front end part of the lumen of the shield tube, the inner needle penetrates the lumen of the outer needle and is projected out, and the inner needle can be housed in the lumen of the shield tube by moving the hub toward a rear end side of the lumen of the shield tube,
• wherein
• the hub is provided with a lateral penetration path that penetrates from a periphery to a lumen of the hub, so that a space formed between an outer peripheral surface of the hub and an inner peripheral surface of the shield tube communicates with the lumen of the hub via the lateral penetration path,
• a sealing section is provided on the outer peripheral surface of the hub, at a position on a rear end side with respect to the lateral penetration path in the hub, so as to keep liquid tightness of the space formed between the outer peripheral surface of the hub and the inner peripheral surface of the shield tube,
• an engagement recess is formed on the outer peripheral surface of the hub at the same position with respect to the axis direction as the position of the lateral penetration path in the hub, and
• a rear-end-side engagement projection is formed at a rear-end-side position on the inner peripheral surface of the shield tube, so as to be engageable with the engagement recess in a state in which the inner needle is housed in the lumen of the shield tube, whereby the hub is held with respect to the shield tube, preventing the inner needle from being re-projected.