#surgical_instrument  a medical instrument used in surgery
  supertype:  medical_instrument__medicalinstrument  instrument used in the practice of medicine
  subtype:  curette__curet  a surgical instrument shaped like a scoop to remove tissue from a bodily cavity
  subtype:  dermatome  a surgical instrument used to cut very thin slices of skin
  subtype:  dilater__dilator  a surgical instrument that is used to dilate or distend an opening or an organ
  subtype:  hemostat__haemostat  a surgical instrument that stops bleeding by clamping the blood vessel
  subtype:  photocoagulator  surgical instrument containing a laser for use in photocoagulation
  subtype:  probe.surgical_instrument  a flexible slender surgical instrument used to explore wounds or body cavities
  subtype:  retractor  surgical instrument that holds back the edges of a surgical incision
  subtype:  snare.surgical_instrument  a surgical instrument consisting of wire hoop that can be drawn tight around the base of polyps or small tumors to sever them; used especially in body cavities
  subtype:  surgical_knife  a very sharp knife used in surgery
     subtype:  catling  a long double-edged knife used for amputations
     subtype:  lancet__lance  a surgical knife with a pointed double-edged blade; used for punctures and small incisions
     subtype:  scalpel  a thin straight surgical knife used in dissection and surgery
  subtype:  trephine__trepan  a surgical instrument used to remove sections of bone from the skull

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