Orthodontic expansion screw

Details Orthodontic expansion screw Orthodontic expansion screw

2007-12-20

2010-11-23

Lewis, Ralph A (Department: 3732)

Dentistry

Orthodontics

By device having means to apply outwardly directed force

Reexamination Certificate

active

07837465

ABSTRACT:
An orthodontic expansion screw having two bodies whose distance from each other can be changed by means of a spindle that engages both bodies. The spindle includes an actuation part for effecting a torque for readjusting the spindle, and a straight-line guide for engaging both bodies and guiding the bodies along two guide axes that are parallel to each other while preventing a relative rotation of the bodies when their distance from each other is being changed. A friction brake is provided that presses onto the actuation part of the spindle and thus generates a frictional force that renders a rotation of the spindle in both directions of rotation more difficult in order to prevent inadvertent readjustment of the spindle.

REFERENCES:
patent: 3742552 (1973-07-01), Balchunas
patent: 5281133 (1994-01-01), Farzin-Nia
patent: 6109916 (2000-08-01), Wilcko et al.
patent: 6328745 (2001-12-01), Ascherman
patent: 6783361 (2004-08-01), Huge et al.
patent: 7384265 (2008-06-01), Hanks
patent: 2004/0214126 (2004-10-01), Förster et al.
patent: 2005/0037313 (2005-02-01), Huge et al.
patent: 10 2004 019 524 (2004-11-01), None

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