Expandable spinal jack for installation between upper and lower succeeding superior articular processes

1. A spinal jack adapted for installation between first and second vertebral processes, comprising:

a central body supporting first and second inter-expandable jack halves between retracted and expanded positions;

each of said jack halves further including gripping portions adapted for engaging the vertebral processes;

a geared mechanism having a tool bit engageable drive gear and inter-engaging outer driven gears which in turn displace said jack halves relative to said central body for expanding or retracting the jack halves in order to establish a corrected adjusted orientation between the processes; and

said drive gear having an inner aperture seating an outwardly biased spring loaded pin for preventing rotation thereof and displacement of said jack halves, with engagement of a tool bit resulting in an inward displacement of a forward portion of said pin in order to disengage from a surrounding surface profile of said inner aperture to permit rotation of said drive gear and inter-engaging outer gears.

2. The spinal jack of claim 1 , further comprising a spring providing an outward bias against said jack halves.

3. The spinal jack of claim 1 , said body and inter-expandable jack halves further comprising any medical grade metal or plastic.

4. The spinal jack of claim 1 , said gripping portions further comprising a pair of spaced apart arms defining a pocket adapted to receive the vertebral process therebetweeen.

5. The spinal jack of claim 4 , said pockets each further including textured surfaces for providing additional gripping of the vertebral processes.