Disposable minimally invasive double-channel reducing expansion sheath and kit thereof

Abstract

The invention discloses a disposable minimally invasive dual-channel reducing expansion sheath, and relates to the technical field of percutaneous nephroscope puncture channel sheaths, the disposable minimally invasive dual-channel reducing expansion sheath comprises an inner sheath body and an outer sheath shell sleeved outside the inner sheath body, a cavity is formed between the inner sheath body and the outer sheath shell, and the disposable minimally invasive dual-channel reducing expansion sheath is characterized in that the middle sections of the inner sheath body and the outer sheath shell are reducing sections; the diameters of the rear sections of the inner sheath body and the outer sheath shell are larger than those of the front sections, a water inlet connector is arranged on the rear section of the outer sheath shell in a communicating mode, and a water outlet connector is arranged at the rear end of the inner sheath body in a communicating mode. On the premise that a micro-channel percutaneous nephroscope operation can be achieved and double-channel vortex type water inlet and outlet can be achieved, low-pressure continuous water circulation of the pelvis is guaranteed, meanwhile, maximization of the inner diameter gap between the nephroscope and the inner sheath is guaranteed, and calculi can be sucked out through negative pressure by moving the nephroscope in a short distance while the calculi are smashed.

Description

technical field [0001] The invention belongs to the technical field of percutaneous nephroscopic puncture channel sheaths, in particular to a disposable minimally invasive double-channel variable-diameter expansion sheath. Background technique [0002] Percutaneous nephroscopic surgery, with the improvement and perfection of X-ray, B-ultrasound, CT positioning and puncture positioning technology, and the improvement of lithotripsy equipment, the accuracy of puncture is getting higher and higher, and the surgical complications are getting fewer and fewer, so the more more and more widely. The development of vascular minimally invasive interventional surgery provides safety guarantee for percutaneous nephroscopic surgery, and most kidney stone operations are solved by percutaneous nephroscopic surgery. The proportion of open surgery is also decreasing. The scope of application of ultra-fine channel and micro-channel percutaneous nephroscopic surgery overlaps to a certain deg...

AI Technical Summary

Problems solved by technology

Moreover, the expansion sheath for percutaneous renal surgery with standard channel and small channel is a single channel, and the water inlet is the instrument operation channel of the thicker nephroscope, so the mirror body of the nephroscope is relatively thick, and the water outlet is the gap between the nephroscope and the surgical expansion sheath , relatively speaking, such a gap is small, and the operator often uses the catheter of the retrograde ureteral catheter and the pulse water flow back and forth pressure of the infusion pump to push the crushed stones through a certain pressure in the renal pelvis to flush out the stones. Pull out the nephroscope from the guide sheath to take out the stones, so the operation is not very convenient, so it is impossible to ensure stable water circulation under the condition of low pressure in the renal pelvis. The 10-14 ultra-micro channel percutaneous kidney is only F8 or even thinner because of the lens body. The operation channel of the instrument is 3.3-3.6Fr. If the 550um laser fiber is used, it is difficult to enter the water from the operation channel. Therefore, a unique double-layer metal expansion sheath is used to realize the vortex type water entry. , but because the gap between the middle sheath and the lens body is small, the larger stones cannot be discharged, and the stones must be pulverized, or the F8 mirror should be retreated behind the chicken wing-shaped Y-shaped single-layer sheath of its thicker connector. After the drainage hole, the negative pressure connected to the inner sheath and the chicken-wing-shaped Y-shaped single-layer sheath connected to it will discharge the larger stones, and the kidney mirror will retreat from the kidney to the thicker chicken-wing-shaped Y-shaped single-layer sheath The distance outside the suction hole of the sheath is relatively long, which brings inconvenience to the operation

Moreover, due to the double-layer metal sheath with a maximum outer diameter of 14Fr and an inner diameter of about 11Fr, the process requirements are extremely high and the price is also high. Many units have not yet been equipped with ultra-microchannel percutaneous kidney

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