1. In some specific nursing operations or tasks, such as invasive operations and special medication, two nurses need to participate and sign for confirmation.

2. Under normal circumstances, double signature requires the participation of two nurses. This can be two nurses in the same department or two nurses in different departments. According to the specific regulations and circumstances, the hospital will have corresponding requirements and regulations.

3. In the process of double signature, there is usually an order of a primary signer and a secondary signer. The chief signatory is usually the nurse who is mainly responsible for the operation, and the deputy signatory is the nurse who supervises and confirms the operation of the chief signatory.

4. After the operation or task is completed, the main signer and the deputy signer respectively sign the corresponding records or forms for confirmation. Generally, the main signer signs first, and then the deputy signer signs for confirmation.