Patent ID: 7608062

Claim:
A method of administering a substance to a bone, the method comprising: (a) introducing a bone screw into a bone, the bone screw comprising two ends connected by a shaft, wherein the shaft is cannulated along at least a portion of its length, and further wherein the bone screw comprises one or more bone screw fenestrations disposed along the cannulated portion of the bone screw shaft; (b) introducing an insert into the cannulated portion of the bone screw shaft, the insert comprising two ends connected by a shaft, wherein the insert is cannulated along at least a portion of its length, wherein the insert further comprises at least one balloon disposed around a portion of its length, and further wherein the insert comprises one or more insert fenestrations along the cannulated portion of the insert between the two ends of the insert; (c) introducing a substance into the cannulated portion of the insert; (d) placing the insert into a first position wherein none of the one or more insert fenestrations align with the one or more bone screw fenestrations such that the substance is maintained within the cannulated portion of the insert; (e) placing the insert into a second position wherein the substance is allowed to flow from the cannulated portion of the insert through at least one of the bone screw fenestrations to the bone; and (f) inflating the balloon in the cannulated portion of the bone screw shaft to form a seal between the insert and the bone screw.