Meta-regression Approaches: What, Why, When, and How?

A nail cutter/clipper for use in treating ingrown nails, hang nails, and/or preventing ingrown nails. In a first embodiment, the nail/cutter includes first and second handles mated at a gudgeon in an X-shaped configuration. The first and second handles are joined to opposed nail cutter heads, and each nail cutter head has a V-shaped blade that defines a void or receptacle for receiving nail cuttings. The nail cutter heads cut a V-shaped notch in a nail when actuated by a user grasping the handles. A second embodiment includes an upper member joined to a lower member at a rearward end with a fastener. At their forward ends, these members each include a V-shaped cutter blade that defines a void, and when the cutter blades are forced together on a nail, a corresponding shaped notch is cut in the notch and the trimming is captured in the cutter blades. A third embodiment is similar to the first embodiment, except that the first and second handles are U-shaped, and the nail cutter heads are pivotally mounted to the handles, so that when not in use, the handles can be rotated about the pivot mountings, so that the nail cutting heads are stored protectively within the handles.