Abstract
Several years ago I developed a small spiral trocar for introducing air into the abdominal cavity as a preliminary to celioscopy. I experimented on its introduction after making abdominal incisions. With the abdomen open, I found that, as the trocar was gently screwed through the abdominal wall, the point slowly and carefully passed through the peritoneum. In the closed abdomen, the moment of entrance of the point, air would rush in by aspiration through the hollow trocar. The danger of the patient jerking away from the instrument was eliminated, and it could be removed only by unscrewing in the opposite direction. The fear of having a hole punched into a bowel or lung by the use of the ordinary needle or trocar is greatly lessened by this spiral instrument. The sudden stab or punch by the present method is a thing of great dread to patients. Furthermore, the physician
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