Patent ID: 7998159

Claim:
A cutting accessory for use with a powered surgical tool, the cutting accessory including; i) an elongated outer tube having a proximal end and a distal end; ii) an outer hub attached to the proximal end of the outer tube, the outer hub being adapted to releasably secure the cutting accessory within the powered surgical tool; iii) an elongated inner member received within the outer tube and having a proximal end and a distal end, the dimensions of the outer tube and the inner member being such as to form an annular channel therebetween for the passage of irrigating fluid; iv) an inner hub attached to the proximal end of the inner member and adapted to be driven by the powered surgical tool; v) a cutting tool carried by the distal end of the inner member, and accessible through a first aperture in the region of the distal end of the outer tube; vi) a bearing member located in the annular channel between the inner member and the outer tube, and blocking the annular channel towards the distal end of the inner member and the outer tube; vii) a bypass channel running external to the outer tube and having a proximal end which is proximal to the bearing member and a distal end which is distal to the bearing member; and viii) a second aperture through the outer tube connecting the annular channel and the bypass channel such that irrigating fluid introduced into the annular channel enters the bypass channel and exits the distal end of the bypass channel, wherein the second aperture is proximal to the distal bearing member.