| 摘要 |
A child-resistant blister package for unit dose products, e.g., medicaments, composed of a blister layer and a cover layer. The blister layer formed of a planar material, e.g., thermoformable or cold-formable webstock, and has plural intersecting perforated line to form plural cells contiguous with the perforated lines. Some or all of the cells of the blister layer have a peripheral planar flanged portion and a blister portion projecting from the flanged portion to form a cavity in which the unit dose product is located. The cover layer is formed of a planar material, e.g., aluminum or other metal foil in either a single layer or laminated, and has plural intersecting perforated line to form plural cells contiguous with those perforated lines. Each cell of the cover layer is the same shape and size as a corresponding cell of the blister layer. The cover layer is fixedly, e.g., adhesively, secured to the blister layer along the flanged portions, with the perforated lines of each being aligned and with the cells of the cover layer being coincident with the cells of the blister layer. A keyhole shaped opening is provided in each cell having a cavity of the blister layer. Each keyhole shaped opening includes an elongated, e.g., 3 mm linear, slit having a pair of ends and a hole, e.g., a 1 mm circular hole, at a first one of the pair of ends of the slit. Each keyhole shaped opening is located in its associated cell of the blister layer so that the first one of the ends of its slit is located adjacent but spaced by a small gap of a predetermined length, e.g., 1 mm, slightly from a perforated line forming an edge of the cell. The hole of each keyhole shaped opening is directed to but spaced, e.g., 4 mm, from the cavity of the associated cell.
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