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In the United States, the authority responsible for issuing registration certificates for Class III medical devices is the U.S. Food and Drug Administration (FDA). The FDA is a federal agency under the Department of Health and Human Services (HHS) that regulates medical devices to ensure their safety and effectiveness before they can be marketed and used.

Class III medical devices are those that pose the highest risk to patients and users. These devices often sustain or support life, are implanted, or present a potential unreasonable risk of illness or injury. Due to the high risk associated with these devices, the FDA requires a rigorous review process before they can be approved for the market.

The primary pathway for Class III device approval is through the Premarket Approval (PMA) process. This process involves a comprehensive review of the device's safety and effectiveness, including clinical data, manufacturing processes, and labeling. The PMA submission is the most stringent type of device marketing application required by the FDA.

Once the FDA completes its review and determines that the device is safe and effective for its intended use, it will issue a PMA approval letter, which serves as the registration certificate for the device. This approval is necessary for the legal marketing of the device in the United States. The FDA's approval is a critical step in ensuring that Class III medical devices meet the highest standards of safety and effectiveness before reaching patients and healthcare providers.

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