Kelling also use filtered air to create a pneumoperitoneum, with the goal of stopping intra-abdominal bleeding ( ectopic pregnancy, bleeding ulcers, pancreatitis) but these studies did not find any response or supporters. Kelling noted that the abdominal cavity could store more than 2.5 liters of blood. The only method to establish a diagnosis and provide treatment at that time was linked to laparotomy. However, as Kelling observed, opening the abdomen could worsen the patient's condition. To halt blood seepage into the abdomen, Kelling proposed a high-pressure insuflation of the abdominal cavity, a technique he called the "Luft-tamponade" or "air-tamponade"
Working together with the Czech surgeon Vitezslav Chlumsky (1867-1943) in Breslau, Kelling expanded his insufflation technique. The purpose of his "coelioskope" was to view the effect of pneumoperitoneum acting as an air-tamponade and not as an endoscopic method itself. That was probably the most important reason why he did not pursue work on this method.
Other research problems concerned him, and he saw little future in this technique. Kelling actually presented his "coelioscopy" in Hamburg as an endoscopic method. The description of this procedure, today known as laparoscopy, introduced Kelling's name into the history of Medicine
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