Patent ID: 8403961
Filing Date: 2013-03-26
Classification: A61B

Abstract:
1. A method for restricting flexion of at least one spinal segment, said method comprising: implanting a constraining structure having a superior end coupled to a superior spinous process and an inferior end coupled to an inferior spinous process or a sacrum, wherein the constraining structure has an undeformed position and implanting comprises placing a superior tether structure over or through the superior spinous process and placing an inferior tether structure over or through the inferior spinous process or sacrum, wherein the tether structures are substantially non-distensible and joined by at least one compliance member which provides an elastic resistance to flexion; wherein the constraining structure provides the elastic resistance to flexion beyond a neutral position of the spinal segment in the range from 7.5 N/mm to 20 N/mm wherein the constraining structure elastically recovers its undeformed position when the spinal segment returns to its neutral position; and wherein the tethers of the constraining structure will experience a creep below 10% after one million cycles at typical physiologic loads.