Effect of inflow cannula side-hole number on drainage flow characteristics: flow dynamic analysis using numerical simulation
| Autor: | Wakako Fukuda, Takeshi Goto, Yoshiaki Saito, Koji Fumoto, Ikuo Fukuda, Tsubasa Tanabe, Takao Inamura, Masahito Minakawa, Minori Shirota, Kazuyuki Daitoku |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
medicine.medical_specialty
Drainage flow Flow (psychology) 030204 cardiovascular system & hematology law.invention 03 medical and health sciences 0302 clinical medicine law Cardiopulmonary bypass Cannula Humans Medicine Computer Simulation Radiology Nuclear Medicine and imaging Advanced and Specialized Nursing Cardiopulmonary Bypass Computer simulation business.industry Models Cardiovascular Venous drainage General Medicine Mechanics Cardiac surgery 030228 respiratory system Inflow cannula Cardiology and Cardiovascular Medicine business Safety Research Blood Flow Velocity |
| Zdroj: | Perfusion. 33:649-655 |
| ISSN: | 1477-111X 0267-6591 |
| DOI: | 10.1177/0267659118782246 |
| Popis: | Background: Venous drainage in cardiopulmonary bypass is a very important factor for safe cardiac surgery. However, the ideal shape of venous drainage cannula has not been determined. In the present study, we evaluated the effect of side-hole number under fixed total area and venous drainage flow to elucidate the effect of increasing the side-hole numbers. Method: Computed simulation of venous drainage was performed. Cannulas were divided into six models: an end-hole model (EH) and models containing four (4SH), six (6SH), eight (8SH), 10 (10SH) or 12 side-holes (12SH). Total orifice area of the side-holes was fixed to 120 mm2 on each side-hole cannula. The end-hole orifice area was 36.3 mm2. The total area of the side-holes was kept constant when the number of side-holes was increased. Result: The mean venous drainage flow rate of the EH, 4SH, 6SH, 8SH, 10SH and 12SH was 2.57, 2.52, 2.51, 2.50, 2.49, 2.41 L/min, respectively. The mean flow rate decreased in accordance with the increased number of side-holes. Conclusion: We speculate that flow separation at the most proximal site of the side-hole induces stagnation of flow and induces energy loss. This flow separation may hamper the main stream from the end-hole inlet, which is most effective with low shear stress. The EH cannula was associated with the best flow rate and flow profile. However, by increasing side-hole numbers, flow separation occurs on each side-hole, resulting in more energy loss than the EH cannula and flow rate reduction. |
| Databáze: | OpenAIRE |
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