Extraoral force-applying orthodontic appliance
US4238188A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Mar 19, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C7/06
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An extraoral force-reaction device engageable with the wearer's head and/or neck, such as a headcap or a neckband, is connected to an intraoral force-applying device, such as molar bands, by force-producing means, such as springs. Snapback of the force-applying means is controlled in response to relative movement of the intraoral means and the extraoral force-reaction means away from each other beyond a predetermined maximum limit, or in response to stressing of the force-producing means beyond a predetermined maximum degree of force exerted by the force-producing means. Snapback control may be effected by latching of a limit latch to prevent or limit return movement of the force-reaction device and the force-applying device, or disconnectible means can be disconnected to interrupt the application of primary force to the intraoral means and reaction force to the head or neck engageable means. The force to be exerted by the spring force-producing means can be readily adjustable in predetermined increments, such as by engagement of different holes in a spring anchor strap with an anchor pin, or by a linear ratchet device. Also, various components of the extraoral force-reaction devic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.