DISTRACTOR WITH BIDIRECTIONAL ROTATION CONTROL

摘要

A distractor, such as a pediatric mandibular distractor, includes a housing member elongated along a longitudinal axis. At least one distal footplate is attached to the housing member. A drive rod and at least one proximal footplate configured to be driven by the drive rod are provided. A housing engaging member is configured to engage a drive rod engaging member to prevent the housing from being rotated in either a first or second direction of rotation relative to the drive rod when a rotational force less than a predetermined force is applied to the housing or drive rod. The drive rod can be rotated relative to the housing in either the first or second rotational direction when a force greater than the predetermined force is applied to the drive rod or the housing.

主权项

1. An internal mandibular distractor comprising:
a housing elongated in a longitudinal direction; at least one distal attachment plate attached to the housing, wherein the distal attachment plate is configured to be attached to a first bone surface; a drive rod arranged inside the housing and elongated in the longitudinal direction; at least one proximal attachment plate that is configured to be driven by the drive rod to move in the longitudinal direction, the at least one proximal attachment plate configured to be attached to a second bone surface, wherein the drive rod comprises a proximal end portion that is configured to be rotated to drive the at least one proximal attachment plate in the longitudinal direction; at least one housing engaging portion provided to the housing; and at least one drive rod engaging portion provided to the drive rod; wherein the at least one housing engaging portion and the at least one drive rod engaging portion are configured to: be engaged in a first relative position of the housing and the drive rod so as to prevent relative rotation in both a first and a second direction of rotation between the drive rod and the housing caused by a force acting on the drive rod or the housing that is less than a predetermined force, and be moved out of engagement by driving the drive rod in either a first or a second direction of rotation of the drive rod with a force equal to or greater than the predetermined force to a second relative position.