Selectively expandable sacral fixation screw-sleeve device

A selectively expandable bone fixation screw-sleeve device, comprising:

• an elongate member;
• an elongate cylindrical sleeve having an upper, a central and a lower portion, each of said portions having an exterior surface and an interior surface, said interior surfaces of each of said portions together defining an interior channel extending axially through said sleeve, said interior channel further being capable of receiving therethrough said elongate member;
• a plurality of axially aligned slots formed in said central portion of said elongate cylindrical sleeve, said slots extending from the exterior surface to the interior surface;
• a plurality of radially aligned slots formed in said central portion, said slots extending from the exterior surface to the interior surface, each of said radially aligned slots connecting selected pairs of adjacent axially aligned slots;
• a plurality of articulated sections, defined between sequential twos of said axially aligned slots, said articulated sections comprising first, second, and third types of sections, wherein said third type of section is defined between a pair of sequentially disposed axially aligned slots which are not connected by one of said radially aligned slots and therefore connect the upper and lower portions of the sleeve together, and wherein said first and second types of sections are defined between said selected pairs of adjacent axially aligned slots which are connected by one of said radially aligned slots, and wherein at least one of each of said first and second types of sections includes an interior conformation such that insertion of said elongate member through said interior channel of said elongate sleeve causes said first and second types of articulated sections to flair outward.