A. Deaver retractor.
B. Langenbeck retractor.
C. Army-Navy retractor.
D. Richardson retractor.
The surgical instrument shown in the picture above represents Deaver retractor.
Deaver retractor is a large, handheld retractor commonly used to hold back the abdominal wall during abdominal or thoracic procedures. It may also be used to move or hold organs away from the surgical site.