Framework of soft nasopharyngeal laryngoscope insertion tube

The utility model relates to a framework of a soft nasopharyngeal laryngoscope insertion tube, which comprises a bourdon tube and a woven mesh tube, the woven mesh tube is sleeved on the periphery of the bourdon tube, and the framework is characterized in that the bourdon tube is formed by winding a steel strip with two different widths, the widths of the two sections of steel strips with different widths are respectively W1 and W2, W1 is less than W2, and W3 is less than W4. The spring tube comprises a throat section and an operation section, the throat section is formed by winding a steel belt with the width of W1, the operation section is formed by winding a steel belt with the width of W2, the throat section and the operation section are connected into a whole through a nasal cavity section, the thread pitch P1 of the throat section is 1.3 mm-1. 7mm, the thread pitch P2 of the operation section is 2.1 mm-2. 8mm, P1 is smaller than P2, and the thread pitch of the nasal cavity section is between the thread