Vertebral Distraction Pump (VDP) is developed to use the distraction technique in a hand-held instrument to help reduce disc herniation and relieve facet syndrome and spinal stenosis. The VDP contacts the tissues over the vertebrae involved, excluding pressure exerted on the peripheral nerves and associated tissues. There is minimal, if any, stretching or pressure put on the nerves. There is a release of the pressure on the pain receptors with no stretching. 

Distraction of the lumbar disc

1)      Static lumbar traction applied with a 45 Kg load effectively opens the disc space,
 apophyseal joint space, and reduces the herniated nucleus pulposis.

2)      the opening of the disc space drops the intradiscal pressure and probably creates a
centripetal force that sucks the herniated disc back into its normal
anatomical position

3)      the anterior and posterior ligaments are stretched under distraction.
The stretching  of the posterior longitudinal ligament may push the herniated disc
 toward the disc  space.