Flexible ureteroscopy can easily reach the renal pelvis and each renal calyx, which has important value in the diagnosis and treatment of renal diseases. In particular, it is ideal for middle and upper calyces stones <2 cm in diameter, calyces stones without severe effusion, and some patients who are not suitable for extracorporeal shock wave lithotripsy. It overcomes the disadvantage that stone displacement cannot be handled under rigid ureteroscopy, and with Holmium laser, the lithotripsy procedure is short, less damaging, and can fully lithotripsy and manage some comorbidities with definite results. However, the one-piece ureteroscope is expensive and its service life is related to the number of uses and the operator's skill in using it, and it is more prone to damage, such as lens bending obstacle caused by damage to the rotation device and damage to the working channel. Especially during holmium laser lithotripsy surgery, holmium laser fiber is very easy to damage the lens or the sealing system such as the mirror body rubber, resulting in black spots on the screen image or blurred imaging with water in the camera fiber, once the damage occurs, the repair cycle is long and the repair cost is extremely high, which can account for 70% of the value of the new endoscope, and even cause the whole set of ureteral flexible mirror to be scrapped, resulting in huge economic losses. The new detachable combined ureteroscope is designed as an independent split part of the core value components such as the camera fiber optic imaging system, and the fragile parts such as the endoscope trocar can be disassembled and assembled for replacement at any time. Its optical system adopts the new technology of single optical fiber, different from the traditional quartz collection fiber structure, with 10,000 pixels, clear and stable transmission images, and no black spot phenomenon due to partial fiber breakage during operation, and no network or honeycomb vignette. This new split combination ureteral flexible microscope is easy to operate and has a clear view. Although it does not fundamentally reduce the fragility of the ureteral flexible scope, its clinical application has the advantage that the parts that are often easily damaged can be replaced individually, which greatly reduces the cost of use. And because the flexible scope cannula is replaceable, it is less expensive and can be used disposably, eliminating the potential risk of cross-infection.