Feasibility of a Dielectric Elastomer Augmented Aorta.

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Materials Science

Background:

• Heart transplantation is the gold standard for severe heart failure, but alternatives are needed.
• The aorta plays a crucial role in the circulatory system, influencing cardiac workload.
• Existing assistive devices often lack efficient integration with natural aortic mechanics.

Purpose of the Study:

• To develop and evaluate a tubular dielectric elastomer actuator (DEA) for augmenting aortic function.
• To assess the DEA's ability to reduce cardiac energy expenditure in severe heart failure.
• To investigate the use of physiological aortic pressure for DEA pre-stretching.

Main Methods:

• Development of a tubular dielectric elastomer actuator (DEA) graft.
• In vitro experiments using a pulsatile flow-loop simulating human physiological conditions.
• Measurement of heart energy reduction under simulated cardiac cycles.

Main Results:

• The DEA graft successfully assisted heart function by modulating aortic deformation and recoil.
• A significant reduction of 5.5% (47 mJ per cycle) in heart energy was observed.
• The DEA's controlled stiffness and utilization of physiological aortic pressure for pre-stretch were key to its performance.

Conclusions:

• The developed dielectric elastomer aorta shows potential as an effective alternative therapy for heart failure.
• This DEA device can reduce cardiac workload by enhancing aortic function.
• The integration of DEA technology with physiological pressures offers a novel approach to cardiovascular assistance.