Apparatus and methods for magnetic alteration of anatomical features

A body member repulsion device, comprising:

• a. a jackscrew capable of being implanted to a body, wherein said jackscrew comprises a first attachment point capable of attaching to a first member and a second attachment point capable of attaching to a second member;
• b. a biasing member configured to absorb loading between said first member and said second member;
• c. an internal rotary magnet coupler capable of being implanted to said body;
• d. a work conduit, wherein said work conduit is disposed between said internal rotary magnet coupler and said jackscrew;
• e. an external rotary magnet coupler capable of being disposed outside said body and proximal to said internal rotary magnet coupler, wherein said external magnetic coupler is magnetically coupled to said internal magnetic coupler, wherein when work is applied to said external rotary magnet coupler said internal rotary magnet coupler receives said work and conveys said work to said jackscrew through said work conduit, wherein said work applied to said jackscrew moves said first attachment point and said second attachment point, or wherein said work applied to said jackscrew moves said first attachment point or said second attachment point;
• and
• f. a gear reduction unit coupled between said internal rotary magnet coupler and said jackscrew to allow a smaller input force on said internal rotary magnet to drive a large output force between said first and second attachments points of said jackscrew.