Koerner F
Klin Monbl Augenheilkd. 1978 Nov;173(5):707-11.
A peristaltic pump (type "Perpex", J. H. Guldener, Zürich, Switzerland) was modified for controlled aspiration in vitrectomy (fig. 1). The surgeon operates start, instantaneous stop and back flush with a single foot pedal. Suction and cutting device are controlled independently. Suction flow can continuously be varied between 0 and 16 ml/min (fig. 2). This less critical function is operated by the assistent. The upper limit of suction flow depends on infusion resistance and preselected differential pressure (fig. 3). The infusion resistance and its reciprocal, the inflow rate, vary considerably with different instruments. In four devices infusion resistance was measured and found to vary by a factor of up to 4.6. Low infusion resistance allows high suction flow and thus shorter operation time for certain conditions such as "ochre membranes" or intrasurgical bleedings. Further aids which we use in combination with a Zeiss OPMI-8 are an intense external xenon light source for variable slit illumination which makes the use of intravitreal fiber optics unnecessary, and a mirror combination to achieve an 11 degrees semi-coaxial stereoscopic view of the operation field for the assistent.
一种蠕动泵（“Perpex”型，J. H. Guldener公司，瑞士苏黎世）经过改装，用于玻璃体切割术中的可控抽吸（图1）。外科医生通过一个单踏板操作启动、瞬间停止和反冲洗。抽吸和切割装置独立控制。抽吸流量可在0至16毫升/分钟之间连续变化（图2）。这个不太关键的功能由助手操作。抽吸流量的上限取决于输液阻力和预先选定的压差（图3）。输液阻力及其倒数即流入速率，在不同器械之间有很大差异。在四种器械中测量了输液阻力，发现其变化高达4.6倍。低输液阻力允许高抽吸流量，因此对于某些情况，如“黄斑膜”或手术中出血，可缩短手术时间。我们与蔡司OPMI - 8联合使用的其他辅助设备包括一个用于可变狭缝照明的强外部氙光源，这使得无需使用玻璃体内光纤，以及一个镜子组合，可为助手提供手术视野的11度半同轴立体视图。
