Patent ID: 7500851

Claim:
A device for incrementally widening the maxillary arch of the jaw of a person, said device adapting to rest upon the teeth of the maxillary arch without mechanical bands or adhesive bonds, and said device further comprising: a transparent mouthpiece having two wings placing over all of the teeth of said jaw each of said wings having a generally U shaped cross section; a housing having a generally hollow rectangular cross section including a top and an opposite bottom and two spaced apart and mutually parallel sidewalls, and said housing fusing by heat or chemical welding upon at least one of said top, said bottom, and said sidewalls to one of said wings upon the interior of the U shaped cross section; an advancing member having a generally hollow rectangular cross section of lesser dimension than said housing including a top and an opposite bottom and two spaced apart and mutually parallel sidewalls, and said advancing member fusing by heat or chemical welding upon at least one of said top, said bottom, and said sidewalls to the other of said wings upon the interior of the U shaped cross section and said advancing member extending telescopically in opposition to said housing; a threaded rod being generally centered in said device, turning and separating said housing outwards from said advancing member laterally within said maxillary arch; and, a pair of cooperating springs being parallel to said threaded rod and providing expansive force upon said housing and said advancing member thus easing turning of said threaded rod, and locating within said advancing member.