Abstract: An image guided surgical system and method for targeting the precise patient specific anatomical placement of surgical instruments and motion preservation implants with surgical navigation. The system and method comprising a surgical navigation system; at least one imaging system coupled to the surgical navigation system; at least one computer coupled to the surgical navigation system and the imaging system having planning software for measuring clinical parameters of anatomy of a subject to be operated on; and at least one display for displaying imaging data, planning data and tracking data.

Abstract: The present invention comprises an electromagnetically operated hydraulic valve device (10) providing an almost instantaneously responsive displacement of a ball valve (60) in order to effect fluid flow relative thereto. Hydraulic valve device (10) comprises a generally cylindrical housing (12) having one end (16) open and a bushing (19) extending from the other end (18), with a plurality of longitudinal openings (14) disposed about the perimeter of housing (12). A cylindrical bobbin (30) having an interior through opening (32) is disposed within housing (12) and supports an electrical winding (34), with a core member (20) enclosing the open end (16) of the housing and having a circular post (22) extending into the bobbin opening (32). A nonmagnetizable sleeve (38) is located within the interior of bushing (19) between the bushing and a cylindrically shaped armature (36).