Patent ID: 8597318

Claim:
A surgical tool comprising: a surgical blade; and a driver configured to rotate the surgical blade, the driver comprising: a rocker assembly configured to cause rotation of the surgical blade to form an incision, the rocker assembly comprising a gear; a ratchet configured to rotate in a first direction and a second direction; a linkage arm connecting the rocker assembly and the ratchet so that rotation of the ratchet causes rotation of the rocker assembly; and a spring configured to be extended by the ratchet when the ratchet is rotated in the first direction, the spring also configured to retract and pull on the ratchet to cause the ratchet to rotate in the second direction; wherein the rocker assembly is configured to rotate the surgical blade forward and backward a first time based on the rotation of the ratchet in the first direction; and wherein the rocker assembly is configured to rotate the surgical blade forward and backward a second time based on the rotation of the ratchet in the second direction.