US Patent 9707017 Interspinous process spacer implant

An interspinous process spacer implant includes first and second bodies each equipped with upper and lower projections. The implant also includes a hinge connecting central parts of the bodies to one another. The hinge allows the bodies to rotate relative to one another in a forward direction. The implant further includes an arresting mechanism that acts between the central parts of the bodies to block reverse rotation of the bodies relative to one another.