Disc replacement device and method of use

An interbody motion device, the device comprising:

• a bottom body member having a convex surface;
• a top body member having a channel;
• and
• a bearing member having a concave surface, wherein the bearing member is operatively connected within the channel and wherein the concave surface of the bearing member contacts the convex surface of the bottom body member when the device is in use.

A fusion implant, the implant comprising:

• a first body member having a domed articulation surface;
• a second body member having a dished articulation surface;
• and
• a means to restrict motion, wherein when operably positioned, the domed articulation surface of the first body member is mated with the dished articulation surface of the second body member and the means to restrict motion is intermediate the first body member and the second body member to couple the first body member to the second body member and inhibit motion therebetween.

A disc replacement device, the device comprising:

• a first body member having a flat interior surface, an arcuate exterior surface adjoining lateral sides of the flat interior surface, and a concave portion extending into the first body member from the flat interior surface;
• a second body member having a flat interior surface, an arcuate exterior surface adjoining lateral sides of the flat interior surface, and a convex portion extending away from the flat interior surface of the second body member;
• a front end and a back end, wherein a longitudinal axis extends from the front end to the back end, the concave portion is positioned generally centrally along the longitudinal axis, and the convex portion is positioned generally centrally along the longitudinal axis;
• and
• wherein when operably positioned, the convex portion of the second body member engages the concave portion of the first body member to provide for movement therebetween.

A surgical method for maintaining a space between two vertebral bodies in a spine of a patient, comprising:

• obtaining a medical device comprising:
• a first body member having a convex articulation surface;
• and
• a second body member having a concave articulation surface, wherein when operably positioned, the convex articulation surface of the first body member engages the concave articulation surface of the second body member;
• inserting and coupling a holding tool into an opening within the medical device;
• rotatably inserting the medical device into the space between the two vertebral bodies;
• and
• disengaging the holding tool to remove the holding tool from an opening in the patient.