Orthodontic expansion screw
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United States of America Patent
Stats
-
Aug 31, 1982
Grant Date -
N/A
app pub date -
Mar 20, 1978
filing date -
Mar 23, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An orthodontic expansion screw is provided having two screw bodies which are displaceable relative to each other by a screw spindle. A guide pin disposed parallel to the spindle is attached to an attachment section of one of the screw bodies and engages a guide bore of the second screw. The screw spindle has threaded sections of counter-rotating threads which engage threaded bores in the screw bodies; such opposed sections extend from an actuating section to which attached. The second screw body has a guide portion which extends from the second screw body portion. The first screw body has a threaded body portion extending from the attachment section whereby maximum separation of the screw bodies is permitted by virtue of the extended threaded bore.
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Family
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Cited Art Landscape
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