Conductive Piezoelectric Myofiber Bioprinted Heart (CPMH): A Single-Fiber Integration of Conductivity, Piezoelectricity, and Muscle Contraction for 3D-Printed Cardiac Tissue

Current bioprinted hearts reproduce only the physical form — they do not conduct electricity, self-generate power, or contract autonomously. This invention disclosure proposes the Conductive Piezoelectric Myofiber Bioprinted Heart (CPMH), a design concept in which a single fiber integrates three functions: (1) Conductivity — carbon nanotube/graphene composite bioink enables electrical signal propagation across the entire fiber network; (2) Piezoelectricity — PVDF-based biocompatible polymer generates electricity from mechanical contraction, enabling self-powered operation; (3) Muscle contraction — actin/myosin-analog artificial muscle proteins contract upon electrical stimulation, creating a self-sustaining beat cycle: contraction generates electricity, electricity drives contraction. The heart is printed in a helical fiber orientation replicating native myocardial architecture, with three functional layers: endocardial (high-speed signal conduction), myocardial (power generation + contraction), and epicardial (whole-body repair current transmission). CPMH serves as the physical implementation material for the previously disclosed Electromagnetic Circulatory Cardiac Engine (ECCE, DOI: 10.5281/zenodo.20725907). Together, ECCE and CPMH form a paired invention for a non-stopping electromagnetic artificial heart. Theoretical basis: V = N / D (Tendo Economics, Katayama Yoshimitsu, 2026). Inventor declaration: The inventor does not manufacture this device. This disclosure is published as an open knowledge base for all developers, materials scientists, bioprinting researchers, and cardiac surgeons.