Substantially constant force coil spring usable in extraoral ort

Details Substantially constant force coil spring usable in extraoral ort Substantially constant force coil spring usable in extraoral ort

1995-05-04

1997-04-15

O'Connor, Cary E.

Dentistry

Orthodontics

Including extra-oral force transmitting means

433 21, A61C 700

Patent

active

056203209

ABSTRACT:
An orthodontic coil spring to be used within an extraoral orthodontic appliance where the coil spring is made of a superelastic, shape-memory alloy wire. The coil spring is to impart a substantially constant force over the entire range of deflection. The level of force is to be between 375 to 800 grams.

REFERENCES:
patent: 4115921 (1978-09-01), Armstrong
patent: 4226589 (1980-10-01), Klein
patent: 4264302 (1981-04-01), Wolk et al.
patent: 4553933 (1985-11-01), Armstrong et al.
patent: 4553934 (1985-11-01), Armstrong et al.
patent: 4849032 (1989-07-01), Kawaguchi
patent: 4872836 (1989-10-01), Grove
patent: 5046948 (1991-09-01), Miura

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