Patent ID: 8974463
Filing Date: 2015-03-10
Classification: A61B

Abstract:
1. A non-invasive adjustable distraction system comprising: a distraction rod having a first end, a second end, and a sealable length disposed between the first end and the second end, the first end being configured for affixation to a subject's skeletal system at a first location, the second end comprising a threaded portion; an adjustable portion configured for placement relative to the subject's skeletal system at a second location remote from the first location, the adjustable portion comprising a housing containing a magnetic assembly and a threaded screw, the magnetic assembly being rotationally and pivotably coupled to the threaded screw thereby permitting play between the threaded screw and the threaded portion, the threaded screw operatively coupled to the threaded portion of the distraction rod, wherein rotation of the magnetic assembly axially moves the distraction rod relative to the housing; a recess disposed in an interior surface of the housing adjacent to one end thereof, the recess defining a volume; an annular seal disposed within the recess, the annular seal having an uncompressed volume and a radial thickness; wherein the annular seal fills a volume of less than 75% of the volume of the recess in the uncompressed state and wherein the radial thickness of the annular seal is configured to be compressed by greater than 7% when the annular seal is compressed between the recess and a portion of the sealable length of the distraction rod.