Universal Ring Retractor IMA Retractor Set can be beneficial during thoracic surgeries in order to keep the incision open and allow the operation process to continue with increased visualization to the area. For example, the retractor set can be mounted on the surgical table and, once the incision is made, can elevate one side of the sternum. The instruments provided with the set include items such as a cross bar, clamp post, ratchet mechanism, and retractor blade.