Patent ID: 7101177
Filing Date: 2006-09-05
Classification: A61C

Abstract:
1. A screw device for orthodontic treatment comprising: a screw-body part having a diameter with external threads extending a length; a platform part axially aligned and integrally formed with the screw-body part, the platform part further having: a head part connected on the flat top plane to the platform part; wherein, the threads of the screw-body part are divided into at least a first thread portion located near to the platform part and a second thread portion located away from the platform part, the threads of the first thread portion are designed to have relatively narrower width and smaller pitch, while the threads of the second thread portion have wider width and larger pitch; wherein, the screw device further comprises an auxiliary unit located between the head part and the platform part, the auxiliary unit has a hollow ring portion having a center hole and at least one accessory member for assisting orthodontic treatment, wherein a concave is formed downward from a bottom side of the head part.