| 摘要 |
<p>A polyaxial colletted locking mechanism for use with orthopedic apparatus includes a screw (170), hook (190), or other orthopedic implant element having a curvate head (172, 192), and a coupling element (100a). The coupling element (100a) has a tapered and colletted portion (102a) having an interior chamber (116a) in which the curvate head (172, 192) is initially polyaxially disposed. A locking collar (160) is disposed around the tapered and colletted portion (102a) such that translation thereof in the direction of the expanding taper causes the interior volume (116a) to contract onto the curvate head (172, 192) and lock it therein. The coupling element generally also includes a rod receiving recess (122a) in either the side or top thereof for receiving a rod of the total implant apparatus. The locking collar (160) may be caused to translate into its locking position by a mutual threading on the tapered portion and the collar, or by pressure applied to it by a separate element (150) which locks the rod in the channel.</p> |
