THE PROGRESS achieved in recent years in anesthesia, in preoperative and postoperative care and in surgical technic has allowed the surgeon to approach the heart and great vessels without fear of a prohibitive mortality rate. As a new field is opened, many instruments are developed to meet the unique and specific needs of the operative procedures.
Recently, work has been in progress on the construction of end to side and side to side anastomoses between the various great vessels. To facilitate the work, it was felt that a clamp should be designed that would satisfy the following requirements: 1. The instrument should be in two pieces, so that it can be applied and removed with the greatest ease; likewise, unless so constructed, it will be impossible to remove it after end to side anastomosis (as is the case with the Freeman clamp1). 2. The edges of the clamp should