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Performance Increase in Venous Drainage for Mini-Invasive Heartsurgery
Saad Abdel-Sayed, Mhedi Belkoniene, Steven Taub, Ludwig Karl von Segesser.
Research laboratory, Lausanne, Switzerland.

OBJECTIVE: Originally, the Smartcanula principle (collapsed insertion and expansion in situ) was developed for venous drainage by gravity. However, in minimally invasive surgery, augmentation with either constrained force vortex pumps or vacuum is often used. The current study was set up to assess whether smaller diameters of self-expanding venous cannulas are sufficient in conjunction with venous drainage augmentation resulting in smaller access orifices.
METHODS: To evaluate cannulas intended for CPB, an in-vitro circuit was set-up with silicone tubing between the test cannula encased in a lower reservoir, the centrifugal pump, and after upper reservoir. Afterload was set arbitrarily at 60mmHg using a centrifuge pump. The pressure value (P) was measured using high fidelity Millar pressure transducers taking in account the level of the test fluid. Flow rate (Q) was measured using an ultrasonic flow meter calibrated with volume tank and timer. RPM of the centrifugal pump were calibrated with a stroboscope. Data display and data recording were controlled using a Lab View application custom made particularly for our application. Self-expanding (Smartcanula 24 F) and control (Biomedicus 25 F) were used.
RESULTS: 60 measurements were recorded. At 1500, 1570, 2000, 2500, and 3000 rpm pump speed, the Q values were 3.6, 5.2, 6.6, 9.3, and 11.8 l/min for the 24F self-expanding Smartcanula respectively. The P values were 3.6, -5.4, -15.9, -45.3, and 80.6 mmHg. Biomedicus 25 F showed Q values from 16 to 19 % times less as compared to 24 F Smartcanula. The Q values were 3, 4.3, 5.4, 7.5, and 9.3 l/min. The P values were 6, 7, 4, 2, and 2 times more as compared to 24 F Smartcanula.
CONCLUSIONS: Our experimental evaluation demonstrated that the self-expanding cannula outperforms the commercially available control cannula. The self-expanding Smartcanula provides superior flow despite the small access diameter.


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