A double-pointed object requires no definition ; its name is definitive. The reason it requires separate classification arises from the peculiar and enormously greater difficulties of safe endoscopic removal as compared with those of removal of single-pointed objects. Staple is the name applied to a double-pointed nail used for fastening wires to wood Double-pointed tacks are used chiefly for laying floor matting. Doublepointed wires used in machine-made baskets, automobile upholstery pins, some kinds of paper-clips, metal fasteners and some kinds of hairpins belong in the same category.
From the all-important point of view of the solution of the mechanical problem of peroral bronchoscopic removal there are two classes of bodies, the bendable and the unbendable. Figures 1, 2 and 3 give a good example of the bendable class. Figures 5, 10, 11, 12, 13, 14, and 15 are good illustrations of the unbendable and unbreakable type.
JACKSON C, JACKSON CL. STAPLES AND DOUBLE-POINTED TACKS AS FOREIGN BODIES: MECHANICAL PROBLEMS OF BRONCHOSCOPIC EXTRACTION. Arch Otolaryngol. 1935;22(5):603–625. doi:10.1001/archotol.1935.00640030620007
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