Development of a compact, highly efficient, totally implantable motor-driven assist pump system

Area of Science:

• Biomedical Engineering
• Medical Devices
• Cardiovascular Technology

Background:

• Heart failure necessitates advanced circulatory support systems.
• Existing assist devices face challenges in efficiency, size, and long-term reliability.
• The need for totally implantable, highly efficient blood pumps is critical.

Purpose of the Study:

• To develop and evaluate a compact, highly efficient, totally implantable assist pump system.
• To assess the durability and performance of the novel blood pump design.
• To demonstrate the feasibility of transcutaneous energy and data transmission for implantable devices.

Main Methods:

• Development of a motor-driven assist pump utilizing a brushless DC motor and miniature ball screw.
• Integration of a magnetic coupling mechanism for active blood filling with mild suction.
• Implementation of a PID follow-up controller with an 8-bit microcomputer for system regulation.
• Testing of the 350 ml pump and 210 ml controller for outflow, efficiency, and durability.

Main Results:

• Achieved a pump outflow of 5.8 L/min against a mean after-load of 100 mm Hg.
• Demonstrated high efficiency rates of 19-21% (pump output/motor input).
• Sustained continuous pumping for 87 days with no mechanical failures reported over 6 months.

Conclusions:

• The developed compact, totally implantable assist pump system exhibits high efficiency and excellent durability.
• The system's design, featuring active blood filling and reliable control, shows significant potential for long-term cardiac support.
• This technology represents a promising advancement in the field of mechanical circulatory support devices.