A quilter's rotary cutter is a precision cutter that has a 45 mm roynd blade that is surgical sharp and looks like a tiny vinyl record except it is high carbon steel as sharp as a surgeon's scalpel. You use it to cut through multiple layers of quilters cotton that speeds the boredom og cutting 3000 square, rectangular, or 60 degree star parallelograms after cutting long strips at 45 degree cross cuts to make star quilts or postage stamp quilts. If you use a 28 mm round blade you can even make a drunkards path or center circle quilts that require a good sewing machine and a few trade secrets for sewing curves together.
The downside of the time you save is that you do not cut yourself because you have to make sure the roller cuts do not wind up taking your fingertip to the emergency room to have a doctor sew it back onto the finger you just shortchanged. I have probably made a thousand charity quilts using a rotary cutter when piecing fabric shapes to order. Only once did I ever have a serious cutas described above. Fortunately I had strong bones back in my teaching days and knew what to do when cut. I was already putting pressure on the finger that day when I retrieved my first aid kit from under the quikt shop counter. It took a couple of weeks to heal. It taught me not to lose sight of safety issues when teaching others how to make a perfect quilt. I love the craft.
Again happy healing and good luck finding the best cover for the wound. Hydrogen peroxide will keep it free of infection a couple of times a day for your 2cor 3 week healing process. Keep it covered and moderately tight till the clean skin grows back together.