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血压计是用于测量人体血压的医疗设备，其核心功能是通过监测血管内压力变化获取收缩压和舒张压数值。根据测量原理和技术差异，血压计主要分为水银血压计、电子血压计和动态血压监测仪三大类，以下从工作原理、类型特点、使用方法及品牌选择四个维度展开分析：
一、工作原理
血压计通过感知血管内压力波动实现测量，不同类型设备的技术路径存在本质差异：
水银血压计：基于帕斯卡定律，通过袖带加压阻断肱动脉血流，利用听诊器捕捉柯氏音（Korotkoff音）变化。当袖带压力高于收缩压时血管完全闭合，随着压力下降至收缩压水平时，血液冲破血管壁阻力形成湍流产生第一声柯氏音，对应收缩压数值；当压力继续下降至舒张压水平时，血流恢复平稳，柯氏音消失，对应舒张压数值。
电子血压计：采用示波法（振荡法）技术，通过压力传感器捕捉袖带内压力波动。加压过程中，血管壁振动产生的压力波幅与血压值存在数学关联，设备内置算法通过分析波幅峰值及前后波动特征，推算出收缩压和舒张压。部分高端型号还集成电容式传感技术，通过监测血管容积变化引起的电容值波动实现测量。
动态血压监测仪：在示波法基础上增加数据存储和定时测量功能，通过24小时连续监测获取血压昼夜节律数据，为高血压诊断和治疗效果评估提供动态依据。
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