High-efficiency calculus-removing expansion sheath of percutaneous nephroscope

Abstract

The invention relates to the field of medical apparatus and provides a high-efficiency calculus-removing expansion sheath in percutaneous nephrolithotomy, which consists of a sealing cap (1), an eccentric solenoid (2), an expansion sheath (3) and an expansion sheath inner disc (4), and is characterized in that the sealing cap (1) is made of a thermoplastic elastomer and has very high elasticity and leak tightness; an endoscope (2.2) is internally tangential to a water inlet (2.5) of the eccentric solenoid, so constant internally tangential relationship between the endoscope and the water inlet (2.5) of the eccentric solenoid is ensured and then a large space for removing calculus is guaranteed; the application of a right angled bend (2.3) of an increasing coupling can prevent the calculus from blocking at the bend, reduce the occurrence of the falling of the calculus into the pelvis after the calculus get to the highest point of a calculus-removing sheath passage because the calculus is too big, and improve calculus-removing efficiency; and the eccentric solenoid (2) can be detached from the expansion sheath (3) and is conveniently used. In conclusion, the application of the expansion sheath can make the percutaneous nephrolithotomy safer and more efficient.

Description

technical field [0001] The invention relates to the field of medical equipment, and relates to an expansion sheath used for efficient calculus removal in percutaneous nephrolithotomy. Background technique [0002] Urinary system stones are the most common diseases in urology. Most patients need laparoscopic surgery for treatment. The best treatment for kidney stones with a diameter greater than 2 cm and upper ureteral stones is percutaneous nephrolithotomy. Lithotripsy tools under percutaneous nephroscopic nephroscopy include ultrasound, pneumatic ballistics, and lasers. Of these three in vivo lithotripsy tools, only ultrasound has the functions of lithotripsy and stone removal. However, the ultrasonic lithotripsy probe is easy to break, and the use cost is high. At present, pneumatic ballistics and laser are the most widely used high-efficiency lithotripsy tools in the body, but they only have the function of crushing stones and cannot remove stones. They need pressurized p...

AI Technical Summary

Problems solved by technology

Lithotripsy tools under percutaneous nephroscopy include ultrasound, pneumatic ballistics, and lasers. Among these three in vivo lithotripsy tools, only ultrasound has the functions of lithotripsy and stone removal. However, the ultrasonic lithotripsy probe is easy to break, and the cost of use is relatively high.

At present, pneumatic ballistics and laser are the most widely used high-efficiency lithotripsy tools in the body, but they only have the function of crushing stones and cannot remove stones. They need pressurized pulsed water flow or stone removal forceps to remove stones, which prolongs the operation time and increases the cost. Renal pelvic pressure, which in turn increases the chance of surgical complications such as severe infection and residual stones after surgery

[0003] The current percutaneous nephroscopic expansion sheath is an ordinary straight tube, which is only an artificial channel between the skin and the renal collecting system. It is only used for various instruments to enter and exit the kidney and to maintain the reflux of lavage fluid, and cannot adjust the internal pressure of the renal pelvis. , can not automatically remove stones, and the application of pneumatic ballistics and laser percutaneous nephrolithotripsy has relatively large limitations, so some people try to add stone gyrations and negative pressure suction ports at the end of the ordinary expansion sheath, although it improves to a certain extent The internal pressure of the renal pelvis is reduced, and the possible danger of renal pelvic pressure is reduced. However, due to the unreasonable structural design, it cannot solve practical clinical problems. When entering the sheath through the endoscope port for lithotripsy, the endoscope and the sheath are not concentric, which reduces the effective stone expulsion space in the sheath, so that the stones need to be broken into smaller pieces before they can be removed, or In the process of stone removal, it is easy to cause broken stones to be stuck between the mirror body and the inner wall of the sheath, which prolongs the operation time; the sheath and the negative pressure suction port are connected by a stone gyratory cavity-the structure is unreasonable, when there are two When larger crushed stones of more than one block are inhaled into the convoluted cavity of the stone at the same time, it may block the negative pressure suction port, and once the negative pressure suction port is blocked, the negative pressure suction will fail, and the pressure in the renal pelvis will increase, which has potential Dangerous, and affect the smooth progress of the operation

At present, there is no expansion sheath with simple structure and convenient use, which can efficiently remove stones and effectively reduce surgical complications.

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