Heijnsdijk E A M, Kragten G A, Mugge W, Dankelman J, Gouma D J
Man-Machine Systems Group, Faculty of Mechanical Engineering and Marine Technology, Delft University of Technology, Delft, The Netherlands.
Minim Invasive Ther Allied Technol. 2005;14(1):45-8. doi: 10.1080/13645700510010773.
Laparoscopic graspers used for manipulating delicate tissue generally possess jaws with fenestrations (windows). The fenestrations should enhance the grip on the tissue; however, fenestrations reduce the contact area between jaws and tissue, leading to higher local pressures and possibly tissue damage. Experiments were performed to determine the effect of a fenestration on the pinch force needed to prevent slip of tissue and on the pinch force leading to tissue damage. In addition, the size and position of the fenestration were determined. Fenestrated jaws resulted in increased tissue damage, without affecting the pinch force needed to prevent slip. These negative effects increased with increasing fenestration size and when the fenestration was located toward the tip of the jaws. Therefore, fenestrated jaws had a smaller safe working range than the jaws without fenestrations.
用于操作脆弱组织的腹腔镜抓钳通常具有带小孔（窗口）的钳口。这些小孔应增强对组织的抓握力；然而，小孔会减少钳口与组织之间的接触面积，导致局部压力升高，并可能造成组织损伤。进行了实验，以确定小孔对防止组织滑动所需的夹力以及导致组织损伤的夹力的影响。此外，还确定了小孔的大小和位置。有孔钳口会导致组织损伤增加，但不影响防止滑动所需的夹力。随着小孔尺寸的增加以及小孔位于钳口尖端附近时，这些负面影响会加剧。因此，有孔钳口的安全工作范围比无孔钳口小。
