fig5 is a detail schematic drawing of the rotating ball valve shown in fig4 0015 fig6 is a detail schematic top view of the valve pictured in fig4 showing the angles of rotation for the plastic lever required to open and close the valve 0016 fig7 is an internal view of the valve showing the placement of the o ring that seals the connection between the handle and the disposable suction tip 0017 fig8 is an illustration of one common grasp of the handle of the present invention used by dental assistants 0018 fig9 is an illustration of another common grasp of the handle of the present invention used by dental assistants referring to the figures there are depicted several views of the invented ergonomic handle 100 for the high volume evacuator commonly used in dental offices this device will preferably be used by professional dental assistants to provide a gripping surface that readily conforms to the contours of the hand this will increase comfort and reduce the incidence of carpal tunnel syndrome and other fatigue related conditions the preferred embodiment of the ergonomic design for a high volume evacuator handle 100 is shown in fig1 and 2 the handle 100 comprises a soft shell or wrap which surrounds a metal tube 2 or pipe that is approximately u00bd inch in diameter and preferably about 4 inches long the metal tube 2 is fitted with a set of threads or ridges 3 at the rear proximal end and a valve 4.