A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/86 (2006.01) A61B 17/88 (2006.01) B25B 15/02 (2006.01) F16B 23/00 (2006.01) A61B 17/00 (2006.01)
Patent
CA 2145449
The outer surface (5) of the screw body (2) of the screw (1) is provided with a coaxial external thread (6). A coaxial channel (7) is provided in the screw body (2), which channel (7) is open at the proximal end (3) in order to receive the shaft (8) of a screwdriver (9) and extends into the area of the distal end (4). The channel wall (13) is rotationally symmetrical about the longitudinal axis (L) in regular rotary steps and defines an axial channel area (22) and a plurality of lobe areas (23) arranged uniformly around the channel area (22). In each lobe area (23) the channel wall (13) has a pair of flanks (24, 25) which extend into the vicinity of an end (26) of the lobe area (23) remote from the channel area (22). In a cross-section of the screw body (2), each lobe area (23) is formed asymmetrical in respect of a diametrical plane. A section of the contour line (17) which corresponds to the leading flank (24) is shorter than a section of the contour line (17) which corresponds to the trailing flank (25). The leading flank (24) may have a form which leads to an increasing extent as the radial distance increases in the direction of screwing-in. At the end (26) of the lobe area (23) the flanks (24, 25) can run together to form an edge and define 3 to 8, preferably 6, sickle-shaped teeth (23) salient with respect to the direction of rotation (D). The shaft (8) of the screwdriver (9) has a form matching the channel (7) in a complementary manner.
Ridout & Maybee Llp
Stahelin Andreas C.
Zimmer Gmbh
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