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Feasibility of therapeutic pneumoperitoneum in a large animal model using a microvaporisator

Reymond, M. ; Hu, B. ; Garcia, A. ; Reck, T. ; Köckerling, F. ; Hess, J. ; Morel, P.

In: Surgical Endoscopy, 2000, vol. 14, no. 1, p. 51-55

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    Title
    • Feasibility of therapeutic pneumoperitoneum in a large animal model using a microvaporisator
    Author
    • Reymond, M.. Digestive Surgery, University Hospital of Geneva, Av Micheli du Crest 24, 14, Geneva, Switzerland
    • Hu, B.. Microflow SA, 2007, Neuchâtel, Switzerland
    • Garcia, A.. Digestive Surgery, University Hospital of Geneva, Av Micheli du Crest 24, 14, Geneva, Switzerland
    • Reck, T.. Department of Surgery, University of Erlangen, Germany
    • Köckerling, F.. Department of Surgery, University of Erlangen, Germany
    • Hess, J.. Microflow SA, 2007, Neuchâtel, Switzerland
    • Morel, P.. Digestive Surgery, University Hospital of Geneva, Av Micheli du Crest 24, 14, Geneva, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:315598
    Summary
    Background: Multimodal therapy is used increasingly in advanced gastrointestinal tumors. Potential benefits of using an intraoperative adjuvant therapy during laparoscopy for cancer have been documented in animal studies. The aim of this study was to develop a device that could deliver such an intraoperative drug therapy. Methods: We developed a micropump suitable for minimally invasive surgery procedures that allowed microdroplets of therapeutic substance to be distributed into the pneumoperitoneum (CO2), creating a "therapeutic pneumoperitoneum.” A closed-loop control system regulates drug delivery according to the gas flow. In vitro, the micropump is able to aerosolize various aqueous and ethanol solutions, including cytostatic and bacteriostatic drugs and adhesionmodulating agents. The size of the microdroplets has been optimized to prevent visual artifacts. Results: The micropump was tested in an animal model (pig). The system was inserted into a 5-mm trocar. After insufflation of a 12-mm CO2 pneumoperitoneum, laparoscopic sigmoid colon resections could be performed with no special difficulties. No fog developed, and no systemrelated complication was observed. At autopsy, the active principle was distributed to all exposed peritoneal surfaces. Conclusions: As opposed to conventional peritoneal washing, therapeutic pneumoperitoneum reaches the entire peritoneal surface, allowing an optimal drug distribution. Drug diffusion into the tissues is enhanced by the intraperitoneal pressure. Precise determination of the instantaneous and total drug quantity is possible. Therefore, this drug delivery system has several advantages over conventional irrigation. Its potential domains of application are locoregional cancer therapy, prevention of port-site recurrences, immunomodulation, analgesia, peritonitis, and prevention of postoperative adhesions