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随着科学技术的飞速发展和人民生活水平提高,医用诊断、治疗及保健电子产品在临床上和家庭保健中的应用不断普及。但此类电子产品在使用过程中的用电安全是一个不可忽视的问题。 人体是一个非常复杂的导体,干燥皮肤的阻抗可达几百千欧,肢体间的阻抗则约为几百欧,当人体触摸到外部电压时要受到电击,不论是电流经皮肤进入体内,再流出体外造成的强电击,还是电流直接进入脏器引起的微电击,都会对生命造成严重威胁。一般情况下,微电击安全值为10微安,而50Hz的交流电流过人体约100微安时,就会引起心室纤颤而危及生命。所以在选用医用诊断、治疗及保健电子产品时,必须首先注
With the rapid development of science and technology and the improvement of people’s living standards, medical diagnostics, treatment, and health care electronic products have become increasingly popular in clinical and home health care applications. However, the safety of electricity used in the use of such electronic products is a problem that cannot be ignored. The human body is a very complex conductor. The impedance of dry skin can reach several hundred kilohms. The impedance between limbs is about several hundred ohms. When the human body touches an external voltage, it must receive an electric shock. No matter if the current enters the body through the skin, The strong electric shock caused by the outflow of the body, or the micro-shock caused by the electric current directly into the organ, will pose a serious threat to life. Under normal circumstances, the micro-shock safety value is 10 microamperes, and when 50 Hz AC current exceeds about 100 micro-amps of the human body, it will cause fibrillation and endanger life. Therefore, when selecting medical diagnosis, treatment and health care electronic products, you must first note