Class I medical device registration with ANVISA (Brazilian Health Regulatory Agency) refers to the formal process through which a medical device is approved for sale and distribution in Brazil. Class I devices are considered to be of low risk, and as such, they are subject to simpler and less stringent regulatory requirements compared to higher-risk devices (Class II and III). This process ensures that the device meets safety, efficacy, and regulatory standards set by ANVISA, allowing it to be legally marketed and used in Brazil.