Internal bone fixation sizing device and methods

A method for determining a depth and a diameter of a cleared-out medullary cavity of a bone comprising:

• gaining access to the medullary cavity of the bone;
• removing medullary material from the medullary cavity to form a void in the bone;
• providing a medical device, the medical device including:
• an outer shaft having a proximal end engaging an activation mechanism, a distal end having a first opening at an upper surface and a second opening at a lower surface, and a longitudinal axis between the proximal end and the distal end, wherein the longitudinal axis of the outer shaft includes a plurality of markers;
• and
• an inner shaft having a proximal end engaging the activation mechanism, a distal end terminating in two sizing arms, and a longitudinal axis therebetween, wherein the two sizing arms are able to move from a retracted position to an extended position extending beyond the outer shaft;
• inserting the medical device into the void in the bone;
• determining the depth of the void by viewing the markers on the outer shaft of the device;
• activating the activation mechanism to move the two sizing arms from the retracted position into the extended position;
• and
• determining a first diameter dimension of the void by reading a readout from a window in the activation mechanism.

A method for clearing excess medullary material from a void in a bone comprising:

• gaining access to the medullary cavity of the bone through an access hole;
• removing initial medullary material from the medullary cavity to form the void in the bone;
• providing a medical device, the medical device including:
• an outer shaft having a proximal end engaging an activation mechanism, a rounded distal end having a first opening at an upper surface and a second opening at a lower surface, and a longitudinal axis between the proximal end and the distal end;
• and
• an inner shaft having a proximal end engaging the activation mechanism, a distal end terminating in two sizing arms, and a longitudinal axis therebetween,
• wherein the two sizing arms move from a retracted position where the two sizing arms are located inside the outer shaft to an extended position where the two sizing arms extend beyond the distal end of the outer shaft through the first opening at the upper surface and the second opening at the lower surface of the distal end;
• inserting the medical device into the void in the bone, wherein the two sizing arms of the medical device are in the retracted position;
• and
• moving the medical device within the void to clear excess medullary material within the void.