(C.J.W); frank.pigula@ulp.org (F.A.P.)
Overline: Cardiovascular diseaseOne Sentence Summary: A soft robotic sleeve modeled on the structure of the human heart assists cardiovascular function in an ex vivo and in vivo porcine model of heart failure.
Abstract:There is much interest in form-fitting, low modulus, implantable devices or soft robots that can mimic or assist in complex biological functions such as the contraction of heart muscle. Here we present a soft robotic sleeve that is implanted around the heart and actively compresses and twists to act as a cardiac ventricular assist device. The sleeve does not contact blood, obviating the need for anticoagulation therapy or blood thinners, and reduces complications with current ventricular assist devices such as clotting and infection. Our approach used a biologically inspired design to orient individual contracting elements or actuators in a layered helical and circumferential fashion, mimicking the orientation of the outer two muscle layers of the mammalian heart. The resulting implantable soft robot mimicked the form and function of the native heart, with a stiffness value of the same order of magnitude as native heart tissue. We demonstrated feasibility of this soft sleeve device for supporting heart function in a porcine model of acute heart failure. The soft robotic sleeve can be customized to patient-specific needs and may have the potential to act as a bridge to transplant for patients with heart failure.