Patent ID: 9192451
Filing Date: 2015-11-24
Classification: A61C

Abstract:
1. A combination comprising: force-generating means for generating an oscillating driving force; and a cutting blade for cutting through human or animal periodontal ligaments (PDL) around the root of a tooth so that the root can be extracted, said cutting blade including: a cutting end portion having first and opposite cutting edges extending longitudinally along opposite sides thereof and a longitudinal axis running continuously along said cutting end portion between said longitudinally-extending cutting edges, a connecting end portion attached to said force-generating means so that said cutting end portion is responsive to the oscillating driving force generated by said force-generating means, whereby said cutting end portion oscillates in opposite directions through an angle greater than zero for cutting through the PDL, and a cutting end portion position indicator including a disk surrounding said cutting blade and having a depression formed in a single side thereof, said depression having a longitudinal axis that extends in the same direction and lies in the same vertical plane as the longitudinal axis of said cutting end portion such that the longitudinal axis of said depression is aligned with the longitudinal axis of said cutting end portion so as to run parallel to and provide a visual indication of the alignment of the first and opposite longitudinally-extending cutting edges of said cutting end portion with respect to the PDL being cut by said cutting edge, wherein the cutting end portion of said cutting blade has a concave tissue debris transfer canal formed therein and along which tissue cut by the first and opposite longitudinally-extending cutting edges of said cutting end portion is removed from said cutting end, said concave tissue debris transfer channel running along the longitudinal axis of the cutting end portion of said cutting blade and extending continuously along said cutting end portion between said longitudinally-extending cutting edges thereof, such that the longitudinal axis of the depression formed in the disk of said cutting end position indicator and the longitudinal axis of the concave channel of said tissue debris channel extend in the same direction and lie in the same vertical plane as the longitudinal axis of said cutting end portion.