Stable conductive myocardial patch with negative Poisson's ratio structure and preparation method thereof

A conductive myocardial patch with stable conductive performance and a negative Poisson's ratio structure, comprising a woven fabric with a concave polygon as a structural unit, wherein the woven fabric is composed of yarns with a conductive coating on a surface of the yarns,

• wherein the conductive coating is synthesized by a polymerization reaction of a conductive polymer monomer, a dopant, and an oxidant,
• wherein an initial conductivity prior to stretching of the conductive myocardial patch is 1-10 S/m, and
• when the conductive myocardial patch is stretched:
• a relative resistance change is less than 5% at 50% tensile strain;
• when a strain of the structural unit is within 50%, a minimum Poisson's ratio of the woven fabric is −0.1;
• and
• the conductive myocardial patch expands in a perpendicular direction of a tensile load, and an anisotropy ratio of Young's modulus of the conductive myocardial patch is 1.99-5.71;
• wherein
• the yarns are yarns with different elasticities, and the yarns with different elasticities comprise elastic yarns and inelastic yarns, and
• the structural unit in the woven fabric is composed of a first weave, a second weave, and a third weave interwoven by the yarns with different elasticities, wherein the first weave, the second weave and the third weave have sequentially decreasing fabric densities, and
• wherein the first weave is a plain weave, the second weave is a twill weave or a satin weave, and the third weave is a weave having warp yarns alternately floating on weft yarns, and
• wherein the densities of the warp yarns and the weft yarns are 30 yarns/cm and 25 yarns/cm, respectively.