Locking mechanism, control handle and catheter device

The invention provides a locking mechanism, a control handle and a catheter device. The locking mechanism comprises a rotary jacking piece, and the rotary jacking piece is provided with at least one thread and an abutting part; and a threaded groove is formed in the peripheral surface of the central shaft. The rotary jacking piece is arranged on the central shaft in a sleeving manner; the inner surface of the abutting part is parallel to the outer peripheral surface of the central shaft; the thread is arranged on the abutting part and slides along the thread groove. According to the locking mechanism, axial limiting is provided while the structure of the rotary ejecting piece is simplified through the thread rotating mechanism, the locking function is achieved without the mode that the ejecting piece and the rotary ejecting piece are arranged in a slope matching mode, on one hand, materials and cost are saved, the assembling difficulty is lowered, and the assembling efficiency is improved; on the other hand,