Bimaxillary jaw expanding appliance

An expansion complex for a mandibular or maxillary arch expander, the expansion complex including:

• an outer housing;
• the outer housing including side walls, a top, a bottom, a back, and an open front;
• a channel in the housing top extending rearwardly from the front of the housing;
• a threaded rod extending forwardly from the housing back wall and being accessible through the channel;
• and at least one post extending parallel to the threaded rod;
• a advancing member telescopically received in the housing;
• the including side walls, a bottom, a top, and a front wall;
• a channel in the top and extending rearwardly from the front wall, the advancing member channel being aligned with the outer housing channel;
• an activation nut threadably received on said threaded rod, said nut being accessible through said channels and movable along said threaded rod by rotation of said nut;
• an activation wing including a first plate slidably received on said threaded rod and a second plate slidably received on said post, said first and second plates being operatively connected to each other;
• said first plate being positioned adjacent said activation nut;
• said first plate, and hence said second plate, being movable relative to said housing and said advancing member by rotation of said activation nut;
• and
• a spring journaled about said post between said activation wing second plate and said advancing member front wall.

An arch expander for a mandibular or maxillary arch, the arch expander including:

• an plate positionable against one of said mandibular and maxillary arch;
• said plate including a first half and a second half;
• an expansion complex in said plate, said expansion complex including a housing fixed in said first plate half and an advancing member telescopically received in said housing and fixed in said second plate half;
• and
• an advancing sheath having a first end and a second end, said first end being pivotally connected to a first tooth band and said second end being pivotally connected to a second tooth band;
• the advancing sheath having:
• a hollow posterior tube having a first end and a second end;
• said posterior tube first end being said advancing sheath first end;
• the posterior tube being threaded at least at a back end thereof and having an attachment at a forward end thereof, the attachment being mountable to said first tooth band;
• a hollow anterior tube, the anterior tube being threaded at a forward end thereof to be threadedly, and adjustably, mounted to the posterior tube;
• a rod which extends through the anterior and posterior tubes, the rod having a first end and a second end;
• said rod second end being said advancing sheath second end;
• the attachment being mountable to said second tooth band;
• and
• a spring extending between a forward end of said anterior tube and a forward end of said posterior tube, said spring urging said anterior tube rearwardly relative to said posterior tube to compensate for jaw pressure;
• the expansion complex including said outer housing and said advancing member:
• the outer housing including side walls, a top, a bottom, a back, and an open front;
• a channel in the housing top extending rearwardly from the front of the housing;
• a threaded rod extending forwardly from the housing back wall and being accessible through the channel;
• and at least one post extending parallel to the threaded rod;
• the advancing member including side walls, a bottom, a top, and a front wall;
• a channel in the top and extending rearwardly from the front wall, the advancing member channel being aligned with the outer housing channel;
• an activation nut threadably received on said threaded rod, said nut being accessible through said channels and movable along said threaded rod by rotation of said nut;
• an activation wing including a first plate slidably received on said threaded rod and a second plate slidably received on said post, said first and second plates being operatively connected to each other;
• said first plate being positioned adjacent said activation nut;
• said first plate, and hence said second plate, being movable relative to said housing and said advancing member by rotation of said activation nut;
• and
• a spring journaled about said post between said activation wing second plate and said advancing member front wall.