Patent ID: 6702455
Filing Date: 2004-03-09
Classification: A61B,A61F,B01F

Abstract:
A bone cement mixing apparatus, comprising:a handle; an input gear which is caused to rotate about a central axis in response to rotation of said handle, wherein (i) said input gear includes a first input gear teeth set and a second input gear teeth set, (ii) said first input gear teeth set is spaced a first radial distance from said central axis, (iii) said second input gear teeth set is spaced a second radial distance from said central axis, (iv) said second radial distance is greater than said first radial distance, (v) said first input gear teeth set extends outwardly away from said central axis, and (vi) said second input gear teeth set extends inwardly toward said central axis; an intermediate gear, wherein said input gear is configured so that during rotation thereof (i) said first input gear teeth set meshingly engages said intermediate gear during a first period of time, and (ii) said second input gear teeth set meshingly engages said intermediate gear during a second period of time which is different from said first period of time; an output gear which is caused to rotate in response to rotation of said intermediate gear; and a mixing blade which is caused to rotate in response to rotation of said output gear.