RETRACTOR, WALLACE STIFLE RETRACTOR, STIFLE JOINT RETRACTOR. Germany Stainless, and Finest Craftsmanship O.R. Grade Premium Quality Lifetime Warranty Wallace Stifle Retractor. A Retractor is a surgical instrument used to separate the edges of a surgical incision so that body parts under the incision may be accessed. Retractor usually describes as a simple handheld tool possessing a curved, hooked, or angled blade and fitted with a comfortable handle.