Tri-roll thread electric surgical impact tool

A surgical impact tool comprising:

• a motor;
• a roller assembly operatively connected to the motor and comprising:
• a first roller supported by a first roller arm,
• a second roller supported by a second roller arm, and
• a third roller supported by a third roller arm;
• an impact structure defining a spring and comprising forward and reverse impact surfaces, the impact structure defining an impact cavity with the forward and reverse impact surfaces disposed on opposite ends of the impact cavity, the impact structure comprising a wall comprising first, second, and third thread elements connected to the wall and engageable with the roller assembly, each of the first, second, and third thread elements including a pair of helical end surfaces and a pair of axially extending surfaces that are engaged by the first, second, and third rollers, respectively;
• a tool holder comprising an impact flange disposed within the impact cavity in between the forward and reverse impact surfaces;
• and
• wherein, during use:
• rotation of the roller assembly against the helical end surfaces of the thread elements causes axial movement of the impact structure to apply a load on the spring, and
• engagement of the roller assembly against the pair axially extending surfaces of the thread elements allows the spring to be unloaded and cause the impact structure to engage the impact flange.