Patent ID: 6918915
Filing Date: 2005-07-19
Classification: A61B

Abstract:
1. A maxilla bone extension apparatus to be utilized in cases of maxilla regressive growth and mandible excessive growth, which is an apparatus to promote bone formation by pulling out a nasal maxilla complex forward and by extending maxilla peripheral sutura part, an apparatus composed of a main body, a fixing arm, a movable cylinder for forward extension, a screw for forward extension, a shaft for forward extension, an arm for angle adjustment, a movable cylinder for angle adjustment, a shaft for angle adjustment, a screw for angle adjustment, a metal sash band, and a driver, wherein, a fixing arm is connected to the rear part of the main body through a hinge, a tip end of a fixing arm is in a flexible flat form adapted to fix onto a zygomatic bone, the fixing arm tip end having a multiple number of holes to let through screws for fixing, a movable cylinder for forward extension is stored inside the main body, a side of the movable cylinder for forward extension exposed from sides of the main body, forming movable rails that can be slid forward and backward, a metal sash band to match peripheral form of a patient's right and left side molar teeth is fixed onto a movable rail exposed from the main body, thread-cutting is applied to inside of the movable cylinder for forward extension, a screw for forward extension fits inside the movable cylinder for forward extension, a tip end of the screw for forward extension is connected to a shaft for forward extension through a wall at the front side of the main body, and when the shaft for forward extension that extends to the front side of the main body is rotated with a driver, the screw for forward extension inside the main body connected to the shaft pushes forward a movable rail and connecting metal sash band, and thus maxilla bone is extended, a screw pitch inside the movable cylinder for forward extension is set so that the distance of the bone extension per one rotation of a shaft for forward extension is 1 mm which is appropriate for the amount of bone growth per one day, a movable cylinder for angle adjustment is stored inside the main body in parallel to the movable cylinder for forward extension, a tip end of an angle adjustment arm is connected to the central part of the main body through a hinge, rear end of the angle adjustment arm is connected to the center part of the fixing arm through a hinge, inside of a movable cylinder for angle adjustment has thread-cutting applied, a screw for angle adjustment fits inside the movable cylinder for angle adjustment, a tip end of the screw for angle adjustment is connected to a shaft for angle adjustment via a wall in the front side of the main body, thus being an apparatus with a structure that when a shaft for angle adjustment is rotated with a driver a screw for angle adjustment rotates, a movable cylinder for angle adjustment moves forward and backward within the main body, the main body tilts vertically, the angle for the direction of extension can be adjusted freely, the angle adjustment function works so that a screw pitch inside the movable cylinder for angle adjustment is set to make the shaft for angle adjustment to move one degree per one rotation.