We have an anatomotor table in the office that performs intermittent traction on both the neck and lower back to decompress the spine and discs.  The top of the table glides back and forth over two sets of spring loaded rollers that straddle the spine and massage the paraspinal muscles in your back as you are getting traction.  Traction can be set to intermittent or constant tension and the weight of the pull is customizable to each individual patient.