Calculus plugging device for ureter

Abstract

The invention relates to a calculus plugging device for a ureter. The device comprises a handle and an outer sheath tube. A sliding block is arranged on the handle and connected with one end of a metal wire arranged in the handle. The other end of the metal wire penetrates through the outer sheath tube. The top end of the outer sheath tube is fixedly connected with the head of a plugging device. The head of the plugging device is formed by knitting of a memory alloy wire. When the metal wire backwardly stretches, the head of the plugging device is pulled into the interior of the outer sheath tube. The head of the plugging device is formed by adoption of nickel-titanium memory alloy and a high-molecular plugging membrane. Additionally, the head of the plugging device has a unique shape anda mechanical structure and can offer higher strength and better guiding performance. Therefore, chippings are not generated due to deformation and can be centralized into the middle part of a ureterallumen. Therefore, side leakage is not likely to happen. Thanks to elasticity and a memory property of memory alloy, the head of the plugging device enjoys better welting performance and side leakageis not likely to happen.

Description

technical field [0001] The invention relates to a ureter calculus occluder, which belongs to the technical field of medical devices. Background technique [0002] Upper ureteral calculi are relatively common urinary calculi. With the development of endoscopic minimally invasive techniques and instruments, ureteroscopic lithotripsy has become an important means of treatment for upper ureteral calculi. However, due to the pressure of ureteral flushing and the impact of laser lithotripsy during the operation, the stones move upward, fall off to the renal pelvis, and stone fragments remain, often failing to achieve the expected results. [0003] The higher the location of the stone, the greater the chance of drift during the operation. According to reports, the incidence of stones in the upper ureter moving to the renal pelvis and calyces during ureteroscopy is as high as 60%. Stones after drift often require further flexible ureteroscopy, percutaneous nephroscopy, or two-stage...

AI Technical Summary

Problems solved by technology

However, stones and stone fragments in the middle and upper ureters are easily washed back into the kidney by the perfusion water flow or the recoil force of the lithotripsy tool. Current ureteral stone occluders are mainly balloon or basket-type structures, and the balloon-type structure has occlusion Insufficient strength and other defects, while the basket structure may have problems such as not easy to welt. If this problem is improved and the welt is good, there may be problems such as leakage of stone fragments along the inclination due to the inclination of the side.

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