Department of Cardiovascular Surgery, University Hospital CHUV, CH-1011 Lausanne, Switzerland.
ASAIO J. 2013 Jan-Feb;59(1):46-51. doi: 10.1097/MAT.0b013e318277a84f.
A new plastic self-expanding Smartcanula (Smartcanula LLC, Lausanne, Switzerland) is designed for central insertion and prevention of caval collapse. The objective of our work is to assess the influence of the new design on atrial chatter. Caval collapse over the entire caval axis, right atrial, hepatic, renal vein, and iliac vein is realized in drainage tubes with holes at 5 cm distance intervals. Smartcanulas with various lengths (26 cm [= right atrial], 34 cm [= hepatic], 43 cm [= renal], and 53 cm [= iliac]) versus two-stage cannulas are compared. Pressure drop (ΔP) is measured using Millar pressure-transducers. Flow rate (Q) is measured using an ultrasonic flow meter. Cannula resistance is defined as the ΔP/Q ratio. Data display and recording are controlled using LabView virtual instruments. At an 88 cm height differential, Q values are 8.69 and 6.8 l/min, and ΔP/Q ratios are 0.63 and 1.28 for the 26-cm Smartcanula and the reference cannula, respectively. The 34-cm Smartcanula showed 8.89 l/min and 0.6 ΔP/Q ratio vs. 7.59 l/min and 0.9 for the control cannula (P < 0.05). The 43-cm and 53-cm Smartcanulas showed Q values of 9.04 and 8.81 l/min, respectively, and ΔP/Q2 ratio of 0.6. The Smartcanula outperforms the two-stage cannula, and direct cannula insertion without guide wire is effective.
一种新型的塑料自膨式 Smartcanula（Smartcanula LLC，瑞士洛桑）旨在进行中心插入并防止腔静脉塌陷。我们的工作目的是评估新设计对心房颤动的影响。通过在引流管上每隔 5 厘米的距离开洞来实现整个腔静脉轴、右心房、肝静脉、肾静脉和髂静脉的塌陷。比较了具有不同长度（26cm[=右心房]、34cm[=肝]、43cm[=肾]和 53cm[=髂]）的 Smartcanula 与两阶段导管。使用 Millar 压力换能器测量压力降（ΔP）。使用超声流量计测量流量（Q）。导管阻力定义为ΔP/Q 比值。使用 LabView 虚拟仪器控制数据显示和记录。在 88cm 的高度差下，26cm Smartcanula 和参考导管的 Q 值分别为 8.69 和 6.8l/min，ΔP/Q 比值分别为 0.63 和 1.28。34cm Smartcanula 显示 8.89l/min 和 0.6ΔP/Q 比值，而对照导管分别为 7.59l/min 和 0.9（P<0.05）。43cm 和 53cm Smartcanula 的 Q 值分别为 9.04 和 8.81l/min，ΔP/Q2 比值为 0.6。Smartcanula 的性能优于两阶段导管，且无需导丝直接插入导管是有效的。
