A surgical pneumatic motor is designed to be used with an MRI machine without affecting orinfluencing the magnetic characteristic of the MRI machine. While certain componentsare made from stainless steel this material is a non-magnetic type. While thissurgical pneumatic motor can be utilized in non-MRI applications it can alsobe modified by changing the more expensive materials to be utilized only in non-magneticapplications. The motor includes an improved vane motor with undercuts in thespindle to increase the power faces of the vanes and spindle itself, the holesin the cylinder are modified to increase the sealing area between the spindle,re-position the inlet cylindrical holes and arrange the cylinder holes and groovesto enhance the life, the cylinder discharge holes are arranged in a pattern toavoid uneven wear of the edge of the vanes, the air flow is modified to flow a portioninto the cylinder, around the cylinder and then into the cylinder before exitingthe motor and a cris-cross plug in the hose attenuates the motor discharge air.The main housing is serrated and the serrations located against the outer sleevedefine an air gap to insulate the handle of the motor and the main seal is made froma plurality of discs arranged to enhance seal life.
