Exoscalpel

The exoscalpel is a precision surgical instrument, and the medical version of a laser scalpel. It employs laser beams to make an incision in skin or other tissue. After completion of surgery, a dermal regenerator can be used to repair the cut tissue.

An exoscalpel was used during the surgery to replace Lieutenant Worf's spinal column in 2368. 

The exoscalpel was a standard medical tool aboard the USS Prometheus (Prometheus class) in 2374.