Surgical cutting instrument with dual surface interlocking coupling arrangement

A hand-held surgical cutting system for cutting bone material, comprising:

• a surgical micro-saw blade having a distal end and a proximal end, the distal end having cutting teeth formed thereon, the proximal end having through-openings formed therein;
• and
• a surgical cutting saw comprising:
• a power source;
• a hand-graspable body;
• a blade coupling mechanism attached to the body and being configured to attach to the proximal end of the surgical micro-saw blade, the blade coupling mechanism comprising:
• a first coupling member including a first blade-contacting surface, the first blade-contacting surface having a first plurality of protrusions rigidly fixed to and extending therefrom and configured to engage openings in the surgical saw blade, the first plurality of protrusions being symmetrically disposed on the first blade-contacting surface;
• a second coupling member including a second blade-contacting surface facing the first blade-contacting surface of the first coupling member, the second blade-contacting surface having a second plurality of protrusions rigidly fixed to and extending therefrom and configured to engage openings in the surgical saw blade, the second plurality of protrusions being symmetrically disposed on the second blade-contacting surface and being offset from the first plurality of protrusions;
• a shaft portion that extends normal to the first blade-contacting surface and through the second blade-contacting surface, the first and the second plurality of protrusions being disposed symmetrically about the shaft portion;
• and
• a sleeve portion that extends normal to the second blade-contacting surface, wherein the shaft portion extends through the sleeve portion;
• wherein the shaft portion transfers power from the power source to the blade coupling mechanism;
• wherein the first plurality of protrusions are not rigidly fixed to the second coupling member, and wherein the second plurality of protrusions are not rigidly fixed to the first coupling member.

A hand-held surgical cutting instrument for cutting bone tissue with a surgical micro-saw blade having openings formed therein, the surgical cutting instrument, comprising:

• the surgical micro-saw blade;
• a hand-graspable body for manipulating the surgical cutting instrument;
• a collet assembly attached to the body for attaching to the surgical micro-saw blade, the collet assembly comprising:
• a driving shaft including a head portion and a shaft portion, the head portion being removably connected to a first end of the shaft portion, the head portion including a first blade-contacting surface facing the shaft portion, the first blade-contacting surface having a first plurality of protrusions arranged about the shaft portion and rigidly fixed to and extending therefrom and configured to engage and pass through first respective discreet openings in the surgical saw blade;
• and
• a sleeve disposed about the shaft portion of the driving shaft and axially movable relative to the driving shaft, the sleeve including a second blade-contacting surface facing the first blade-contacting surface, the second blade-contacting surface having a second plurality of protrusions arranged about the shaft portion and rigidly fixed to and extending therefrom and configured to engage and pass through second respective discreet openings in the surgical saw blade, the first plurality of protrusions being offset about the shaft portion from the second plurality of protrusions,
• wherein the first plurality of protrusions are not rigidly fixed to the sleeve, and wherein the second plurality of protrusions are not rigidly fixed to the head portion, and
• wherein at least one of the first and second blade-contacting surfaces includes a plurality of receiving recesses formed therein, the receiving recesses being sized and shaped to receive the first or second respective protrusions of the other of the first or second blade-contacting surfaces;
• wherein the surgical micro-saw blade extends from the hand-graspable body and is powered through the collet assembly.