The female elbow, which is specially designed to match the male elbow, is practical and precise in design and manufacturing. In the design process, conventional analysis methods are used to understand the characteristics of the male elbow, so as to create matching internal pin holes and external shapes. The outer shell adopts the conventional injection molding process to ensure basic toughness. The internal pin holes are processed with conventional precision machining to ensure the accuracy of the hole diameter and the neat arrangement. After being plugged with the male elbow, it relies on the basic mechanical interlocking structure to cope with daily vibrations and pulls and maintain the stability of the connection. The design of the elbow conforms to the requirements of common irregular spaces, and the connection direction can be adjusted as needed. It is often used in fields that have certain space requirements, such as consumer electronic products and ordinary medical monitoring equipment, providing a practical flexible solution for circuit connection.