This Innomed Hendren Self-Retaining Retractor is a 16.5cm surgical instrument designed by D.H. Hendren, MD, featuring a self-retaining spring and screw mechanism that maintains consistent retraction without manual assistance . Its atraumatic blade profile (22mm x 14mm) provides gentle, even retraction, making it particularly effective for holding back subcutaneous fat and retracting the deltoid muscle during pediatric, general, orthopedic, and urologic procedures .