Ureter sheath and head end cap thereof

Abstract

The invention discloses a head end cap, which comprises a head end cap main body, wherein a negative-pressure suction passage is kept in the head end cap main body; and a blocking structure, which isused for preventing large-diameter broken calculi from entering into the negative-pressure suction passage, is arranged at the inlet side of the negative-pressure suction passage. The invention also discloses a ureter sheath, which comprises a working portion and an operating portion, wherein the working portion comprises a multi-cavity tube; one end of the multi-cavity tube is connected to the operating portion, and the head end cap is arranged at the other end of the multi-cavity tube; a negative-pressure suction path, which communicates with the negative-pressure suction passage, is arranged in the multi-cavity tube; and a negative-pressure suction interface, which communicates with the negative-pressure suction path, is arranged in the operating portion. According to the ureter sheathand the head end cap thereof provided by the invention, the circumstance that a pipeline gets blocked by the broken calculi can be effectively prevented, and reliability can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a ureter sheath and a head end cap thereof. Background technique [0002] The ureters are connected to the renal pelvis on the upper side and the bladder on the lower side. They are a pair of slender tubes in the shape of a flat cylinder with an average diameter of 0.5-0.7 cm. The adult ureter has a total length of 25-35 cm, located in the retroperitoneum, and descends vertically along the front of the medial side of the psoas major muscle into the pelvis. The ureter has three strictures: one at the transition between the renal pelvis and the ureter (where the ureter begins), one across the entrance to the pelvic pelvis, and a final one inside into the bladder wall. These narrowings are places where stones, blood clots and necrotic tissue tend to stay. The flexible ureteroscope guide sheath is mainly used clinically for ureteral stenosis, adhesion, obstructi...

AI Technical Summary

Problems solved by technology

[0006] The hard tube of the catheter part is usually made of stainless steel. When entering the human body, the metal hard tube will increase the discomfort of the patient, and even cause the patient's muscle spasm, so that the catheter can be held tightly so that it cannot enter the urinary catheter smoothly.

At the same time, the hard tube is used to cover the outside of the flexible tube, which increases the overall diameter of the catheter, so that when the catheter is inserted into the urethra of children or patients with ureteral stenosis, the resistance it receives is large, which is more likely to cause muscle spasm of the patient, or to the patient. Some damage to the urethra

[0007] When in use, the part of the hose protruding from the hard tube is bent under the operation of the handle. Since the operator cannot see the inside of the catheter when the catheter is inserted into the catheter, if the hose protrudes out of the hard tube due to improper operation When the length of the tube is short and it is forced to bend under the control of the handle, it is easy to break the optical fiber in the hose due to the small bending radius, causing damage to the endoscope

[0008] At the same time, there are usually three internal working channels of the existing hose, which are the instrument channel, the steel wire channel and the image channel. The image channel is also equipped with an illumination fiber, which is easy to damage the image fiber during long-term use, reducing the damage of the image fiber. life

In addition, when the hose is bent, there is a certain angle between the plane where the axis line of the steel wire channel is located and the plane where the hose is located, so that the bending operation of the hose is inflexible and precise

[0009] Similarly, the Chinese patent with the publication number CN 203408026 U discloses a flexible end ureteroscope with a retractable outer sheath. The method of combining soft and hard sheaths is adopted, so there are inevitably the above-mentioned deficiencies

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