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电子听诊器是利用电子技术收集处理心肺音,并依此辅助判断病人身体状况的一种仪器。针对传统电子听诊器灵敏度低、低频响应差等缺点,基于PVDF非均匀曲率半径的弯曲夹紧结构,提出了一种高灵敏度的电子听诊器设计方案。通过建立相应的非齐次弦振动模型,理论分析比较证明了非均匀曲率相比均匀曲率的灵敏度有显著提高,并优选非均匀曲率半径结构灵敏度最大的参数研制出一款新型电子听诊器拾音器。实验测试结果表明,该拾音器的灵敏度达到1.7mV/Pa,相较近年来研究的均匀曲率半径PVDF与硅胶衬底组合结构的拾音器灵敏度提高了13.3%。该拾音器能在2-2kHz频带范围中保持平坦的频响特性,涵盖心肺音采集的频响范围,为较完整地获取心肺音信号提供有力保障。
Electronic stethoscope is the use of electronic technology to collect heart and lung sound collection, and thus help determine the patient’s body condition of an instrument. Aiming at the shortcomings of low sensitivity and low frequency response of traditional electronic stethoscope, a highly sensitive electronic stethoscope design scheme based on PVDF non-uniform curvature radius curved clamping structure is proposed. Through the establishment of corresponding nonhomogeneous chord vibration model, the theoretical analysis shows that the sensitivity of the non-uniform curvature is significantly improved compared with that of the uniform curvature, and the most sensitive parameter of the non-uniform curvature radius structure is the best one to develop a new electronic stethoscope pickup. Experimental results show that the pickup sensitivity of 1.7mV / Pa, compared with the uniform radius of curvature in recent years, the PVDF and silica gel substrate combination of pickup sensitivity increased by 13.3%. The pickup maintains a flat frequency response in the frequency range of 2 kHz to 2 kHz and covers the frequency response range of cardio-pulmonary sound acquisition, providing a strong guarantee for more complete acquisition of cardio-pulmonary sound signals.