| 主权项 |
1. An implantable orthopedic device, comprising:
a first plate, having an outward-facing surface facing away from said device and an inward-facing surface opposed to said outward-facing surface, and having a plate longitudinal direction; a second plate opposed to the first plate; and a mechanism located between the first and second plates, the mechanism being capable of causing relative motion of the first and second plates toward or away from each other; wherein the first plate comprises, on the inward-facing surface of the first plate, a planar ramp surface, the planar ramp surface having a ramp direction inclined at an oblique ramp angle with respect to the plate longitudinal direction; wherein the oblique ramp angle with respect to the plate longitudinal direction is from 15 degrees to 75 degrees; wherein the planar ramp surface is bounded on respective sides by respective first and second grooves; and wherein the ramp surface and the first and second grooves in combination engage and capture a geometric feature of the mechanism while permitting sliding of the geometric feature relative to the planar ramp surface along the ramp direction. |
