Patent ID: 8366559

Claim:
A cannulated flexible drive shaft comprising: a tubular shaft having a proximal end, a distal end, an inner surface and an outer surface; and at least two interlocking sections located on the tubular shaft, said at least two interlocking sections each having at least one pin and at least one socket, said at least two interlocking sections comprising a first interlocking section and a second interlocking section, the at least one pin on the first interlocking section having a circumferential width that increases as said at least one pin on the first interlocking section extends from the outer surface of the shaft to the inner surface of the shaft, so that said at least one pin on the first interlocking section becomes gradually wider toward the inner surface, the at least one pin on the second interlocking section having a circumferential width that decreases as said at least one pin on the second interlocking section extends from the outer surface of the shaft to the inner surface of the shaft, so that said at least one pin on the second interlocking section becomes gradually narrower toward the inner surface.