Related Experiment Video
Updated: Feb 23, 2026
07:34
A Cost-effective and Reliable Method to Predict Mechanical Stress in Single-use and Standard Pumps
Published on: August 5, 2015
9.9K
A Ferrofluidic Seal Specially Designed for Rotary Blood Pumps
Yoshinori Mitamura1, Masayoshi Fujiyoshi1, Toshiobu Yoshida1
1Department of Electronic and Information Engineering, School of Engineering, Hokkaido Tokai University, Sapporo, JapanDepartment of Cardiovascular Surgery, Keio University School of Medicine, Tokyo, JapanYasuhisa Biomechanic Company, Tokyo, Japan.
Artificial Organs
|September 5, 2017
Summary
A novel ferrofluidic seal was developed for axial flow blood pumps, effectively sealing motor shafts. This technology maintains high sealing pressure, crucial for reliable rotary blood pump performance.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Materials Science
Background:
- Effective motor shaft sealing is critical for rotary blood pump functionality.
- Existing sealing technologies may present challenges in biocompatibility and long-term performance.
- Axial flow pumps require specialized sealing solutions to prevent leakage and maintain operational integrity.
Purpose of the Study:
- To develop and evaluate a ferrofluidic seal for axial flow rotary blood pumps.
- To ensure the ferrofluidic seal prevents leakage and maintains biocompatibility.
- To assess the sealing performance under various operational conditions.
Main Methods:
- A ferrofluidic seal was designed using a plastic magnet, two pole pieces, and a shield with a cavity.
- Ferrofluid was injected into the gap between the pole pieces and the motor shaft.
- Sealing pressure was measured at different motor speeds up to 11,000 rpm.
Main Results:
- The ferrofluidic seal maintained a sealing pressure exceeding 23.3 kPa (175 mm Hg).
- This performance was sustained across motor speeds up to 11,000 rpm.
- The integrated shield effectively contained the ferrofluid, minimizing blood contact.
Conclusions:
- The developed ferrofluidic seal is a viable technology for axial flow blood pumps.
- The seal demonstrates robust performance, maintaining high sealing pressure.
- This innovation contributes to the advancement of reliable and safe rotary blood pump systems.
