Patent ID: 8992717
Filing Date: 2015-03-31
Classification: A61B,A61M,B29C,B29K,B29L,Y10T

Abstract:
1. A method of making a helical drive shaft having a helical auger blade with a desired pitch, depth, width and outer diameter comprising: placing a cylindrical drive shaft into a polymer tube, the polymer tube having opposite ends, a longitudinal axis extending between the opposite ends, and a generally circular cross section; attaching one end of the polymer tube to the drive shaft; applying heat to the tube overlying the drive shaft at a temperature sufficient to soften the polymer tube; and twisting the softened polymer tube about the longitudinal axis and relative to the drive shaft to buckle a portion of the tube, the buckled portion of the tube forming at least a portion of the helical auger blade with the desired pitch, depth, width and outer diameter.