Styrene Block Copolymer Based Conductive Elastic Composite Bioelectrode And Its Application In ECG Monitoring

With the improvement of the living standard of human society and the high-intensity way of work,the incidence of cardiovascular and cerebrovascular diseases continues to rise,it has become a major disease endangering human health,and the monitoring,diagnosis,prevention and treatment of the heart can prevent the occurrence of such diseases.Wearable ECG monitoring uses biological wearable sensors to collect and record physiological parameters of the human body,and bioelectrical signals on the surface of the human body are collected through the bioelectric collection electrode(bioelectrode for short)to achieve continuous non-invasive diagnostic detection,so as to help the examiner achieve health management.Traditional ECG monitoring devices are often too large to carry around,and the ECG electrode patches used for monitoring can cause problems such as skin irritation.Therefore,in order to meet the long-term ECG monitoring,it is very important to design a kind of portable,flexible and flexible bioelectric collection equipment.In order to solve the above problems and challenges,this paper proposes a composite fiber electrode with styrene block copolymer,namely stylene-ethylene-butene-styrene(SEBS)as the elastic base,carbon black(CB)and poly3,4-vinyl dioxythiophene(PEDOT)as the conductive filler,which can simultaneously have high mechanical properties,stable electrical properties and good cellular biocompatibility.It has good advantages in wearable bioelectric collection.This paper mainly focuses on the following three aspects:1.SEBS/CB/PEDOT elastic fiber electrodes were prepared by wet spinning technique with styrene-ethylene-butylene-styrene as the substrate and carbon black and poly-3,4-ethylenedioxythiophene as the conductive filler.The comprehensive performance of the fiber electrode was optimized by regulating the content of PEDOT.The electrode has a stable polarization potential,low interfacial impedance(<4ⅹ10~4Ω),high tensile rate(1400%),high tensile strength(7.5 MPa)and good biocompatibility.Applying it to bioelectric harvesting electrodes,it can accurately capture bioelectric signals in human body and has a large potential in the field of human health monitoring.2.SEBS/CB/PEDOT fabric electrode-based wearable ECG monitoring wristband and ECG monitoring suit were designed and prepared,and the performance of the fabric electrode-based ECG acquisition device was comprehensively described from three aspects:structural design of the wristband fabric electrode,electrode size and electrode position of the ECG monitoring suit,and the acquisition of ECG signals under different motion states of the wireless ECG monitoring suit.After 1000 Martindale wear cycles,the mass loss of the fabric electrodes was only 1.3%.In addition,the SEBS/CB/PEDOT fabric electrode-based ECG monitoring suit has a stronger competitive advantage in terms of appearance,ECG acquisition performance,and wearing comfort compared to two other commercially available ECG monitoring suits.3.A polyvinyl chloride mold was used to construct composite fiber electrodes with ionic gel surface modification of SEBS/CB/PEDOT skin-core structure.The prepared fiber has low interface impedance,small and stable polarization potential(variation of less than 0.001 V in1 minute),excellent water retention and good adhesion,which provides a feasible solution for the dry electrode movement artifact at the skin-electrode interface and the influence of ECG signal collection.