Systems, devices, and methods capable of retracting organs are disclosed. In one embodiment, a retractor body comprises a deformable resilient frame defining a central opening and a deformable membrane extending across a portion of the central opening wherein the deformable resilient frame is arranged for complete disposal within the body of a patient and for varying the size of the central opening. In some exemplary embodiments, the retractor is arranged to form a helically coiled arrangement for insertion into the body of a patient. Delivery devices for delivering a deformable resilient retractor and methods of delivery are also disclosed.