Abstract
This study was carried out to develop a miniature magnetic fluid (MF) seal working in a liquid environment. The miniature MF seal is intended for use in a catheter blood pump. The requirements for the MF seal included a size of less than Ø4×4.5mm, shaft diameter of 1mm, sealing pressure of 200mmHg, shaft speed of up to 40000rpm, and life of one month.The miniature MF seal was composed of an NdFeB magnet (Ø4×Ø2×1) sandwiched between two pole pieces (Ø4×Ø1.1×0.5). A shield (Ø4×Ø1.2×1.5) was placed on the pole piece facing the liquid to minimize the influence of pump flow on the MF. The seal was installed on a Ø1 shaft. A seal was formed by injecting MF (Ms: 47.8kA/m and η: 0.5Pa·sec) into the gap between the pole pieces and the shaft. Total volume of the MF seal was 44μL. A sealing pressure of 370mmHg was obtained at motor speeds of 0-40,000rpm. The seal remained perfect for 10 days in saline under the condition of a pump flow of 1.5L/min (The test was terminated in accordance with plans). The seal remained intact after ethylene oxide sterilization during which the seal was exposed to high pressures. In conclusion, the newly developed MF seal will be useful for a catheter pump.
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