Interspinous process device and method

摘要

An interspinous process device is configured for placement between adjacent spinous processes on a subject's spine. The device includes a housing configured for mounting to a first spinal process, the housing having a lead screw fixedly secured at one end thereof. A magnetic assembly is at least partially disposed within the housing and configured for mounting to a second spinal process. The magnetic assembly includes a hollow magnet configured for rotation within the magnetic assembly, the hollow magnet comprising a threaded insert configured to engage with the lead screw. An externally applied magnetic field rotates the hollow magnet in a first direction or a second, opposite direction. Rotation of the hollow magnet in the first direction causes telescopic movement of the magnetic assembly out of the housing (i.e., elongation) and rotation in the second direction causes telescopic movement of the magnetic assembly into the housing (i.e., shortening).

主权项

1. An interspinous process device configured for placement between adjacent spinous processes on a subject's spine comprising:
a housing configured for mounting to a first spinous process, the housing comprising a lead screw fixedly secured at one end thereof and a first mounting surface, wherein the first mounting surface comprises a channel in a surface of the first mounting surface; a magnetic assembly at least partially disposed within the housing and configured for mounting to a second spinous process, the magnetic assembly comprising a hollow magnet having a longitudinally extending bore defining an inner surface, the bore extending in a direction substantially between the first spinous process and the second spinous process, the hollow magnet configured for rotation within the magnetic assembly, the hollow magnet comprising an internally threaded insert affixed to the inner surface of the bore, the internally threaded insert configured to coaxially engage with the lead screw; a second mounting surface coupled to the magnetic assembly, wherein the second mounting surface is dimensioned to fit into and slide within the channel; and wherein an externally applied magnetic field rotates the hollow magnet, wherein rotation of the hollow magnet in a first direction effectuates telescopic movement of the magnetic assembly out of the housing.