A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/56 (2006.01) A61B 17/72 (2006.01) A61F 2/46 (2006.01) A61B 17/68 (2006.01) A61B 17/86 (2006.01)
Patent
CA 2090020
A locking cap (10) for anchoring an implanted medical device within a bone (suh as an intramedullary fixation rod (14)) has a cylindrical, helically threaded body, a socket (28) concentrically disposed in one end (22), and an interface (26) for coope- rating with a driving tool, such as a wrench or screwdriver. Once a device such as an intramedullary fixation rod (14) has been implanted within a bone, the locking cap (10) is implanted by being threaded into the bone with a driving tool, its socket (28) en- gaging the near end (12) of the device (14). The socket (28) of the locking cap (10) can be smooth, or it can be threaded so as to thread onto the near end (12) of the device (14) as the cap (10) is threaded into the bone. If threaded, the pitch of the cap's outer threads (16) can exceed the pitch of the inner threads (30) so that the cap (10) advances into the bone more quickly than it adv- ances onto the end (12) of the device (14). Alternatively, the inner thread (30) pitch can exceed, of equal, the outer thread (16) pitch so that the cap (10) advances into the bone more slowly than, or at the same rate as, it advances onto the end (12) of the de- vice (14), respectively.
Borden Ladner Gervais Llp
Mclaren Alexander C.
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