What does "24G indwelling needle" mean?

　　A 24G indwelling needle refers to a medical device, with "24G" generally indicating a needle diameter of approximately 0.55 mm. The specific details are as follows:

　　An indwelling needle is a medical device used for placing and maintaining catheters or tubing within the body. It is typically made of stainless steel or plastic and features a sharp tip and a connector that can be attached to infusion equipment or other medical devices. The size of an indwelling needle is usually indicated by gauge (G), where 24G corresponds to a needle diameter of about 0.55 mm. This size is suitable for small and fragile blood vessels. Generally, the smaller the gauge number, the larger the needle diameter. Indwelling needles are commonly used to establish and maintain intravenous access for administering medications, drawing blood samples, and other medical procedures requiring catheter placement, such as contrast imaging studies or continuous monitoring.

　　Patients are advised to seek timely medical attention when experiencing discomfort and to undergo standardized treatment under the guidance of a physician, which helps promote recovery.