Bidirectional reaming cutter
View Patent ↗A surgical rotary reamer including a shaft and a cutting head connected to the shaft. The cutting head has a plurality of cutting teeth. At least one cutting tooth has a forward portion, a rearward portion and a mid-portion therebetween. The forward portion has a first cutting edge that cuts in a first rotary direction. The rearward portion has a second cutting edge that cuts in the first rotary direction and/or a second rotary direction. The mid-portion interconnects the forward portion and the rearward portion and includes a recessed portion.
1. A surgical rotary reamer, comprising:
a shaft having an end;
a cutting head connected to said shaft end, said cutting head having a plurality of cutting teeth, at least one said cutting tooth having:
only two extended cutting teeth, said two extended cutting teeth being a first extended cutting tooth and a second extended cutting tooth;
only one recessed portion extending between said first and second extended cutting teeth, said recessed portion being elongate;
a forward portion having a first cutting edge that cuts in a first rotary direction along a first axial direction and said first extended cutting tooth coupled therewith;
a rearward portion having a second cutting edge that cuts in a second rotary direction along a second axial direction opposite said first axial direction and said second extended cutting tooth coupled therewith; and
a mid-portion interconnecting said forward portion and said rearward portion, said mid-portion having only two transitional cutting tooth portions and only one said recessed portion, said recessed portion being between said transitional cutting tooth portions, said recessed portion including a first end and a second end opposing said first end, said first and second ends respectively connected to said transitional cutting tooth portions, said cutting head being coaxially connected to said shaft about an axis of the reamer, said recessed portion being substantially parallel with said axis running from said first end to said second end, said recessed portion having a length which is greater than said first extended cutting tooth and is greater than said second extended cutting tooth.
2. The reamer of claim 1 , wherein each of said plurality of cutting teeth are configured substantially identical.
3. The reamer of claim 1 , wherein said recessed portion is approximately equidistant a first distance from said axis.
4. The reamer of claim 3 , wherein said first extended cutting tooth is a second distance from said axis and said second extended cutting tooth is a third distance from said axis, said first distance being less than said second distance, said first distance being less than said third distance.
5. The reamer of claim 4 , wherein said third distance is one of approximately equal to said second distance and less than said second distance.
6. The reamer of claim 5 , wherein said second distance and said third distance are approximately equal.
7. The reamer of claim 6 , wherein said two transitional cutting tooth portions include a first transitional cutting tooth portion and a second transitional cutting tooth portion, said first transitional cutting tooth portion being between said recessed portion and said first extended cutting tooth, and said second transitional cutting tooth portion being between said recessed portion and said second extended cutting tooth, said first and second transitional cutting tooth portions varying in distance from said axis between said first distance and said second distance.
8. The reamer of claim 7 , wherein said first transitional cutting tooth portion is substantially a mirror image of said second transitional cutting tooth portion.
9. A surgical reamer having a plurality of cutting teeth, at least one of the cutting teeth comprising:
only two extended cutting teeth, said two extended cutting teeth being a first extended cutting tooth and a second extended cutting tooth;
only one recessed portion extending between said first and second extended cutting teeth, said recessed portion being elongate;
a forward portion including a first cutting edge that cuts in a first rotary direction along a first axial direction and said first extended cutting tooth coupled therewith;
a rearward portion including a second cutting edge that cuts in a second rotary direction along a second axial direction opposite said first axial direction and said second extended cutting tooth coupled therewith; and
a mid-portion interconnecting said forward portion and said rearward portion, said mid-portion having only two transitional cutting tooth portions and only one said recessed portion, said recessed portion being between said transitional cutting tooth portions, said recessed portion including a first end and a second end opposing said first end, said first and second ends respectively connected to said transitional cutting tooth portions, the reamer including a cutting head having a first cutting head end and a second cutting head end, said cutting head including the plurality of cutting teeth, said cutting head having an axis extending from said first cutting head end to said second cutting head end, said recessed portion being substantially parallel with said axis running from said first end to said second end, said recessed portion having a length which is greater than said first extended cutting tooth and is greater than said second extended cutting tooth.
10. The reamer of claim 9 , wherein said axis is a rotational axis, said recessed portion being approximately equidistant a first distance from said rotational axis.
11. The reamer of claim 10 , wherein said recessed portion interconnects said first extended cutting tooth and said second extended cutting tooth.
12. The reamer of claim 11 , wherein said first extended cutting tooth is a second distance from said axis and said second extended cutting tooth is a third distance from said axis, said first distance being less than said second distance, said first distance being less than said third distance.
13. The reamer of claim 12 , wherein said third distance is one of approximately equal to said second distance and less than said second distance.
14. The reamer of claim 13 , wherein said second distance and said third distance are approximately equal.
15. A method of cutting a cavity in a bone, comprising the steps of:
providing a shaft having an end and a cutting head connected to said end of said shaft;
contacting the bone with said cutting head, said cutting head having a plurality of cutting teeth, at least one said cutting tooth having:
only two extended cutting teeth, said two extended cutting teeth being a first extended cutting tooth and a second extended cutting tooth;
only one recessed portion extending between said first and second extended cutting teeth, said recessed portion being elongate;
a forward portion having a first cutting edge that cuts in a first rotary direction along a first axial direction and said first extended cutting tooth coupled therewith;
a rearward portion having a second cutting edge that cuts in a second rotary direction along a second axial direction opposite said first axial direction and said second extended cutting tooth coupled therewith; and
a mid-portion interconnecting said forward portion and said rearward portion, said mid-portion having only two transitional cutting tooth portions and only one said recessed portion, said recessed portion being between said transitional cutting tooth portions; and rotating said cutting head in a first rotary direction, said recessed portion including a first end and a second end opposing said first end, said first and second ends respectively connected to said transitional cutting tooth portions, said cutting head being coaxially connected to said shaft about an axis of the reamer, said recessed portion being substantially parallel with said axis running from said first end to said second end, said recessed portion having a length which is greater than said first extended cutting tooth and is greater than said second extended cutting tooth.
16. The method of claim 15 , further comprising the steps of:
stopping said cutting head from rotating in said first rotary direction; and
rotating said cutting head in said second rotary direction.
17. The method of claim 16 , wherein said recessed portion is approximately equidistant a first distance from said axis.
18. The reamer of claim 17 , wherein said first extended cutting tooth is a second distance from said axis and said second extended cutting tooth is a third distance from said axis, said first distance being less than said second distance, said first distance being less than said third distance.