Patent ID: 7566325
Filing Date: 2009-07-28
Classification: A61M

Abstract:
1. A winged medical needle device, comprising: a winged shield that has a substantially cylindrical shield tube and a pair of wings linked to a front end side of the shield tube; a hub that is inserted into an inner bore of the shield tube so as to be movable in an axial direction; and a cannula that is mounted to a front end portion of the hub, wherein the hub includes a main tubular portion, a first holding portion that is provided on a side closer to a front end than the main tubular portion, and a second holding portion that is provided on a side closer to a rear end than the main tubular portion, the first holding portion includes a first large diameter portion that has a portion whose diameter is larger than a diameter of the main tubular portion, a first annular groove that is provided on a side closer to the front end of the hub than the first large diameter portion, a second annular groove that is provided on a side closer to the rear end than the first large diameter portion, and a second large diameter portion that is provided on a side closer to the rear end than the second annular groove so as to be adjacent to the second annular groove, the second holding portion includes a third annular groove, the winged shield includes a holding mechanism that is provided at a base end portion of the shield tube, and an inward annular protrusion that is formed on an inner surface of the shield tube on a side closer to a base end than the holding mechanism, and the inward annular protrusion can be engaged with the second annular groove, the holding mechanism includes a bendable strip that is attached to an outer peripheral surface of the shield tube, a protrusion that is provided on the bendable strip, and a through hole that is provided on a wall of the shield tube so that the protrusion can be inserted into the inner bore of the shield tube by wrapping of the bendable strip, and the protrusion can be engaged with the first annular groove and the third annular groove, by inserting the protrusion into the through hole so that the protrusion is engaged with the third annular groove, the hub is held with the shield tube so as not to be moved within the shield tube in a state where the cannula protrudes for a predetermined length from a front end of the shield tube, a surface of the protrusion that faces a bottom surface of the third annular groove when the protrusion is engaged with the third annular groove is a curved surface having a curvature substantially equal to a curvature of the bottom surface and is in contact with the bottom surface of the third annular groove, and by moving the hub in the axial direction toward the base end with respect to the shield tube, the inward annular protrusion of the shield tube is engaged with the second annular groove of the hub, and a tip of the cannula is stored in the shield tube in this state, and further by engaging the protrusion of the holding mechanism with the first annular groove, the hub is held with the shield tube so as not to be moved within the shield tube; and by inserting the protrusion into the through hole so that the protrusion is engaged with the third annular groove, the hub is held so as not be moved while being rotatable within the shield tube in the state where the cannula protrudes for a predetermined length from the front end of the shield tube.