CN116036446A - Ureteral catheter with adjustable - Google Patents

Abstract

The embodiment of the disclosure provides an adjustable ureteral catheter, which comprises a catheter body, wherein a double-cavity structure at least comprising an expansion cavity and a drainage cavity is arranged in the catheter body, a balloon is arranged on the catheter body, the expansion cavity is communicated with the balloon, a joint part is arranged at the proximal end part of the catheter body, the expansion cavity and the drainage cavity extend to the proximal end part of the catheter body and are connected with the joint part, the distal end part of the catheter body is provided with at least one arc-shaped structure, and the tail end of the catheter body is provided with an opening; a pull wire is disposed on the tube body and extends along an outer sidewall of the tube body from a proximal end portion to a distal end portion for tensioning the preformed arcuate structure into a secure structure. According to the embodiment of the disclosure, the drainage effect from the renal pelvis to the bladder in the balloon expansion process is optimized, the risk of hydronephrosis is obviously reduced, the long-term effective position keeping is ensured, the balloon displacement caused by ureteral peristalsis, patient movement and the like is prevented, and the continuous and accurate expansion of the in-vivo narrow position is realized.

Description

Ureteral catheter with adjustable

Technical Field

The present disclosure relates to the field of medical devices, and in particular to an adjustable ureteral catheter.

Background

In the urologic spectrum, benign stenosis of the ureter is one of the more common diseases. Benign ureteral stenosis is a chronic progressive disease, and can be free of any clinical symptoms in early stage, and along with gradual aggravation of the stenosis degree, hydronephrosis gradually aggravates, and can cause side kidney function damage, even kidney failure and other conditions. For the treatment of ureteral stenosis, the current stage is still mainly surgical treatment.

In recent years, as the technology of the endoluminal of urinary surgery, particularly the ureteroscope technology, is becoming mature and the endoluminal surgical equipment is being updated, the endoluminal minimally invasive technology has become a main means for treating benign stenosis of ureters. At present, various operation modes for treating ureteral stenosis by using endoluminal minimally invasive surgery, such as ureteral catheter dilatation, ureteroscope hard dilatation, ureteroscope stent implantation, sacculus dilatation, endoureteroscope incision and the like, are widely applied clinically, and the techniques have the advantages of simple operation, short operation time, small wound, fewer postoperative complications, quick recovery of patients and the like. The ureteral stent implantation can rapidly and effectively improve most ureteral obstruction symptoms, especially treat obstruction caused by stenosis caused by ureteral lumen lesions, and can obtain satisfactory treatment effect. However, the ureteral stent has small tube diameter, cannot be directionally expanded according to a narrow position, has limited expansion capacity, and has reduced curative effect. And the balloon can only be expanded in a short period after the balloon expansion operation, the long-term effect is poor, and the recurrence is easy.

Disclosure of Invention

It is an aim of embodiments of the present disclosure to provide an adjustable ureteral catheter to solve the problems in the prior art. In order to solve the technical problems, the embodiments of the present disclosure adopt the following technical solutions:

the embodiment of the disclosure provides an adjustable ureteral catheter, which comprises a catheter body, wherein a double-cavity structure at least comprising an expansion cavity and a drainage cavity is arranged in the catheter body, a balloon is arranged on the catheter body, the expansion cavity is communicated with the balloon, a joint part is arranged at the proximal end part of the catheter body, the expansion cavity and the drainage cavity extend to the proximal end part of the catheter body and are connected with the joint part, the distal end part of the catheter body is provided with at least one arc-shaped structure, and the tail end of the catheter body is provided with an opening; a pull wire is disposed on the tube body and extends along an outer sidewall of the tube body from a proximal end portion to a distal end portion for tensioning the preformed arcuate structure into a secure structure.

In some embodiments, a stay wire fixing device is disposed on the joint portion, one end of the stay wire is fixedly connected with the arc-shaped structure, and the other end of the stay wire is connected with the straightening fixing device.

In some embodiments, at least one loop structure may also be provided in the middle of the tube.

In some embodiments, drainage holes are provided in the surface of the tube.

In some embodiments, the drainage holes are uniformly distributed on the drainage cavity in a straight line or in a spiral shape.

In some embodiments, the distribution density and/or pore size of the drainage holes on the arcuate structure is greater than the distribution density and/or pore size of the drainage holes elsewhere on the drainage lumen.

In some embodiments, a developing ring is disposed on both sides of the balloon.

In some embodiments, the tail end of the expansion cavity is positioned at the middle section of the balloon, and a through hole is arranged at the tail end of the expansion cavity so as to be communicated with the balloon.

In some embodiments, the joint part is in a Y-shaped structure and comprises a first arm and a second arm which are mutually intersected, one end of the first arm is communicated with the drainage cavity, and the other end of the first arm is used for externally connecting a drainage bag; one end of the second arm is in communication with the expansion chamber.

In some embodiments, a two-way valve capable of switching on and off is arranged on the second arm.

According to the embodiment of the disclosure, the drainage effect from the renal pelvis to the bladder in the balloon dilatation process is optimized by adjusting the tube body structure of the conventional balloon dilatation catheter, the risk of hydronephrosis is obviously reduced, the long-term effective holding position is ensured by the stay wire, balloon displacement caused by ureteral peristalsis, patient movement and the like is prevented, continuous accurate dilatation at a narrow position in a body is realized, the continuous dilatation of a narrow ureter in the body is expected to be kept, 30-90 days are kept, the problems that the balloon dilatation catheter can only be expanded in a short term and has poor long-term effect and the like are solved, and the catheter has excellent treatment effect on ureter stenosis.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a schematic structural view of a ureteral catheter according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a ureteral catheter according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a tube body in a ureteral catheter according to an embodiment of the present disclosure;

fig. 4 is a schematic view of the placement of drainage holes in a ureteral catheter according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of an arc-shaped structure in a ureteral catheter according to an embodiment of the present disclosure;

fig. 6 is a schematic structural view of a ureteral catheter according to another embodiment of the present disclosure;

fig. 7 is a schematic structural view of a pull wire fixture in a ureteral catheter according to an embodiment of the present disclosure;

fig. 8 is a schematic illustration of a pull wire untrawn in a ureteral catheter according to an embodiment of the present disclosure;

fig. 9 is a schematic view of a tensioned pull wire in a ureteral catheter according to an embodiment of the present disclosure.

Reference numerals:

1-a tube body; 11-an expansion lumen; 12-drainage cavity; 13-drainage holes; 2-balloon; 21-expanding the hole; 3-joint part; 31-a first arm; 32-a second arm; 4-a developing ring; 5-arc structure; 6-ring structure; 7-pulling wires; 8-stay wire fixing device.

Detailed Description

Various aspects and features of the disclosure are described herein with reference to the drawings.

It should be understood that various modifications may be made to the embodiments of the application herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Other modifications within the scope and spirit of this disclosure will occur to persons of ordinary skill in the art.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.

It should also be understood that, although the present disclosure has been described with reference to some specific examples, a person skilled in the art will certainly be able to achieve many other equivalent forms of the present disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.

The above and other aspects, features and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the disclosure in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.

The specification may use the word "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.

Embodiments of the present disclosure provide an adjustable ureteral catheter for achieving a long-term distension effect against a lesion stenosed site within a patient's ureter for facilitating post-treatment. As shown in fig. 1, fig. 1 shows a schematic structural diagram of the ureteral catheter according to the embodiment of the present disclosure, where the overall outer diameter size of the ureteral catheter is in the range of 4-12F, that is, the effective length of the ureteral catheter during operation is in the range of 15-100cm, where the outer diameter size and the effective length are matched with ureters of different patients, so that the requirements of use and expansion in ureters with different diameters or different lengths can be met.

Specifically, as further shown in fig. 1, the ureteral catheter includes a tube body 1, where the tube body 1 is in a cylindrical tubular shape, and has a dual-cavity structure inside, and a balloon 2 is disposed on the tube body 1, where the balloon 2 may be located at different distances from a distal end of the tube body 1 to meet the requirements of differentiation of a ureteral stricture to be dilated, and the distal end refers to an end far away from an operator and close to an operation position of a patient, and the proximal end refers to an end near the operator and far away from the patient.

The balloon 2 is expandable at a specified location in the patient, wherein the balloon 2 is filled with fluid through the tube 1, the balloon 2 expands in the ureter after filling with fluid, with a diameter in the range of 4-8mm and a length in the range of 20-200mm after expansion. To facilitate the expansion of the balloon 2, the balloon 2 may be made of polyurethane, nylon or block polyamide. Further, a hydrophilic coating may be provided on the surface of the tube body 1 and the balloon 2.

In addition, as shown in fig. 2, developing rings 4 are disposed at two sides of the balloon 2, and the positions of the balloon 2 in the ureter of the patient can be conveniently observed in real time through the developing rings 4, so that the accurate and long-term arrangement of the balloon 2 in the ureter is facilitated. The number and position of the developing rings 4 may be determined according to actual needs, for example, according to the length of the balloon.

Further, as shown in fig. 3, fig. 3 shows a schematic cross-sectional view of the tube body 1, in the tube body 1, a dual-cavity structure including at least an expansion cavity 11 and a drainage cavity 12 is provided, for example, the expansion cavity 11 and the drainage cavity 12 may be disposed in parallel along the length direction of the tube body 1 in the tube body 1, where the expansion cavity 11 and the drainage cavity 12 may both be a single-layer tube cavity structure, or a steel wire mesh or a spring may be used to strengthen the cavity to ensure a certain hardness.

Specifically, as shown in connection with fig. 1 and 2, the inflation lumen 11 here communicates with the balloon 2 for delivering liquid to inflate the balloon 2 when inflation is required, such that liquid can be injected into the balloon 2 through the inflation lumen 11 and inflate the balloon 2. In one embodiment, to facilitate communication of the inflation lumen 11 with the balloon 2, the trailing end of the inflation lumen 11 may be located in the middle section of the balloon 2; in another embodiment, a through hole 21 may be provided at the tail end of the expansion chamber 11 to communicate with the balloon 2, so as to facilitate the entry of liquid into the balloon 2.

The drainage cavity 12 can be arranged through the balloon 2, the drainage cavity 12 is used for keeping the urine in the ureter smooth so as to realize timely drainage of the urine, and the length of the drainage cavity 12 is arranged to enable the urine to pass through the bladder-ureter-kidney and other parts in the patient, so that the urine at a plurality of positions in the patient is drained.

Further, as shown in fig. 1, a joint 3 is provided at the proximal end of the tube body 1, and the expansion chamber 11 and the drainage chamber 12 can extend to the proximal end of the tube body 1 and be connected to the joint 3. Specifically, the joint part 3 is provided with a Y-shaped structure, and comprises a first arm 31 and a second arm 32 which are mutually intersected, one end of the first arm 31 is communicated with the drainage cavity 12, and the other end of the first arm 31 can be externally connected with a drainage bag, so that urine drained from the bladder and the renal pelvis in the drainage cavity 12 can be drained outside the body; one end of the second arm 32 communicates with the expansion chamber 11 to facilitate the delivery of fluid to fill the balloon 2 by an external syringe or pressure pump or the like.

In addition, in order to better realize filling of the balloon 2, a two-way valve capable of realizing on-off is further arranged on the second arm 32, so that when the balloon 2 is expanded, the two-way valve is opened to be connected with a syringe or a pressure pump, and liquid can be injected into the expansion cavity 11 for expanding the balloon 2 because the second arm 32 is communicated with the expansion cavity 11; after filling, the two-way valve is closed to prevent backflow of liquid or gas, and the balloon 2 is kept in a continuously expanded state.

Further, as further shown in fig. 1 in combination with fig. 5, considering that urine is required to be drained through the drainage lumen 12 at the location of the bladder, renal pelvis, etc., at least one arc-shaped structure 5 is provided at the distal end portion of the tube body 1 extending into the patient, where a plurality of continuous arc-shaped structures 5 may be formed, and the drainage lumen 12 or the end of the last arc-shaped structure 5 is provided with an opening to facilitate urine collection. The increased number of arcuate structures 5 herein may increase the drainage area to drain and contain more urine.

The diameter of the arc-shaped structure 5 is set according to the size of the bladder of the patient, so that the arc-shaped structure 5 can be stably placed in the bladder of the patient, and for example, the arc-shaped structure 5 can be hung on the bladder of the patient to stably collect urine.

In order to facilitate the placement of the arc-shaped structure 5 on the bladder to prevent the arc-shaped structure 5 from falling off the patient's bladder, there are various structures of the arc-shaped structure 5 based on the structure of the bladder, etc., as shown in fig. 5, the arc-shaped structure 5 may be a complete ring-shaped structure as shown in fig. 5 (a), that is, the distal end of the drainage lumen 12 is bent into a closed ring-shaped structure, which is convenient to be stably hung on the bladder; of course, as shown in fig. 5 (b) and 5 (c), an unsealed loop structure can be formed, and the unsealed loop structure can be arranged on the bladder of a patient, and can be used for adjusting the arc curvature according to the size of the bladder so as to be suitable for the bladder of different sizes or ureter openings of different orientations. In addition, the above-mentioned arrangement of the arc-shaped structure 5 can effectively promote the fixation strength of the ureteral catheter in the patient body so as to keep the drainage position stable.

Further, the arc-shaped structure 5 is made of soft and biocompatible materials such as polyurethane, polyamide or silica gel, so that the irritation to the bladder when hung on, for example, the ureter opening can be reduced.

Further, in another implementation of the disclosed embodiment, as shown in fig. 6, at least one ring-shaped structure 6 may be further disposed at the middle of the tube body 1, the ring-shaped structure 6 may be formed by bending the tube body 1, where the ring-shaped structure 6 may be disposed at the renal pelvis site to further increase the drainage area to drain and contain more urine. Both the arcuate structure 5 and the loop structure 6 herein are in communication with the drainage lumen 12 to facilitate drainage and collection of urine.

In addition, in order to facilitate the drainage of urine, a drainage hole 13 is provided on the wall surface of the tube body 1, as shown in fig. 4, for example, the drainage hole 13 may be provided at the a portion of the tube body 1 shown in fig. 1, and the drainage hole 13 may be located on the surface of the proximal portion and the middle portion of the drainage cavity 12, may be located on the surface of the arc-shaped structure 5 at the distal portion, and may be located on the surface of the ring-shaped structure 6 at the middle portion.

Preferably, since the arc-shaped structure 5 is disposed at the position of the bladder of the patient, it is required to have a larger drainage area to collect urine at the bladder more, for which reason the distribution density of the drainage holes 13 on the arc-shaped structure 5 is greater than the distribution density of the drainage holes 13 at other positions on the tube body 1 to increase the efficiency of collecting urine at the bladder, where the density refers to the number of the drainage holes 13 per unit area on the surface of the tube body 1.

Of course, in order to promote drainage efficiency, in another embodiment, the arc structure 5 and the cooperation of the drainage hole 13 can significantly promote the drainage effect in the bladder, for this reason, the aperture of the drainage hole 13 on the arc structure 5 is greater than the aperture of the drainage hole 13 at other positions on the tube body 1, so, through the change of the density and/or aperture of the drainage hole 12, the arc structure 5 can drain more urine at the positions of the bladder, etc., and realize better drainage effect.

The design of the arc-shaped structure 5 at the distal end of the tube body 1 can be fixed at the position of the bladder of the patient, the arc-shaped structure 5 and the ring-shaped structure 6 can increase the length of the drainage cavity 12 in the bladder of the patient so that urine can be fully drained, and the distribution of the drainage holes 13 on the tube body 1, particularly on the arc-shaped structure 5, can greatly increase the drainage quantity of the urine.

Further, considering that the proximal end and the middle section of the drainage lumen 12 are located in the renal pelvis and ureter, the drainage holes 13 are uniformly distributed on the drainage lumen 12, for example, the drainage holes 13 may be disposed at predetermined intervals on the lumen surface of the drainage lumen 12; in the arrangement mode, the drainage holes 13 can be distributed linearly, so that the whole drainage of the bladder, the ureter and the kidney is kept smooth, the risk of infection and hydronephrosis is reduced, and the drainage holes can be distributed spirally along the surface of the cavity, so that the drainage efficiency can be improved, urine at different positions can be effectively drained, and the drainage effect is better compared with that of linear arrangement.

It should be noted that, in order to facilitate the fixation of the arc-shaped structure 5 and the loop-shaped structure 6 in the patient, for example, the arc-shaped structure 5 and the loop-shaped structure 6 mentioned above are preformed structures before being extended into the patient, and the preformed structures are loose as a whole, sometimes cannot form a good fixation in the bladder or the like, and may be loosened, scattered or even fall off due to ureteral peristalsis, patient movement or the like during surgery or other operations, so that the balloon is displaced.

For this purpose, a pull wire 7 is provided on the tube body 1, the pull wire 7 extending from a proximal end to a distal end along an outer side wall surface of the tube body 1, wherein after the pull wire 7 is used for the ureteral catheter to extend into a patient, the preformed arc-shaped structure 5 and/or the ring-shaped structure 6 on the tube body 1 are tensioned into the fastened arc-shaped structure 5 and ring-shaped structure 6, and after being straightened into a fixed structure, the whole radius thereof is reduced to be capable of being stably sleeved and fixed at a position such as a bladder. Furthermore, as shown in fig. 7, a wire fixing device 8 is further provided on the joint portion 3, which is connected to the proximal end of the wire 7, for fixing the wire 7 after straightening to keep the wire 7 in a continuously locked state.

Specifically, one end of the pull wire 7 is fixedly connected with the arc-shaped structure 5 located at the distal end portion of the tube body 1, and the other end of the pull wire 7 is connected with the straightening fixing device 8 located on the joint portion 3, wherein, in order to ensure that the pull wire 7 can tighten the arc-shaped structure 5 and the ring-shaped structure 6 to form a fastening structure, a connecting hole is formed in the outer side wall surfaces of the arc-shaped structure 5 and the ring-shaped structure 6, and the pull wire 7 passes through the connecting hole so that the pull wire 7 can be clung to the wall surface of the tube body 1 without deviating.

The pull wire 7 may also be passed through the connection hole of the arc-shaped structure 5 at one end portion thereof and returned to the joint portion 3 so that both end portions thereof are connected to the joint portion 3, thereby enhancing the fastening effect of the arc-shaped structure 5 and the loop-shaped structure 6.

Further, considering that the stay wire fixing device 8 is used to tighten the preformed arc-shaped structure 5 and/or the ring-shaped structure 6 on the pipe body 1 into the fastened arc-shaped structure 5 and ring-shaped structure 6, for example, a clamping structure may be adopted, and such a clamping structure may be a clamping structure, or a fixing structure such as a thread may also be adopted, so that when the stay wire 7 is pulled in, the stay wire 7 is clamped in a fixing groove on the joint portion 3 by, for example, clamping.

In this way, during the placement of the ureteral catheter into the body of a patient, the ureteral catheter may be initially straightened using a straightening sleeve made of metal or polymeric type, in particular, since the stiffness of the straightening sleeve herein is greater than the ureteral catheter, the ureteral catheter is straightened in the straightening sleeve as much as possible in order to be pushed later into the target site in the patient; further, after the ureteral catheter and the guide sleeve reach the target position under the guidance of the guide wire, the guide sleeve, the guide wire and the like are removed, when the arc-shaped structure 5 is sleeved on the bladder, the ring-shaped structure 6 is sleeved on other positions, the preformed arc-shaped structure 5 and the ring-shaped structure 6 on the catheter body 1 are tensioned into the fastened arc-shaped structure 5 and the ring-shaped structure 6 through tensioning the stay wire 7, then the proximal end of the stay wire 7 is locked on the joint part 3 through the straightening fixing device 8, for example, the stay wire 7 can be locked through a clamping structure, the arc-shaped structure 5 and the ring-shaped structure 6 form a fastening or tensioning state under the action of the locking force, and the shape fixing of the arc-shaped structure 5 and the ring-shaped structure 6 is ensured. Fig. 8 and 9 are schematic structural diagrams of the loop-shaped structure 6 before and after tensioning, wherein the pull wire 7 is not locked before tensioning, the loop-shaped structure 6 is in a free preformed state, the pull wire 7 is completely locked after tensioning, and the loop-shaped structure 6 is completely fixed in shape, so that the ureteral catheter can be effectively prevented from being shifted in a patient.

The use method of the ureteral catheter for ureteral stenosis long-term expansion and drainage is as follows:

after determining the stenosed position of the ureter of a patient, the ureteral catheter may be initially straightened using a straightening sleeve made of metal or polymer, in particular, since the straightening sleeve herein has a hardness greater than that of the ureteral catheter, the ureteral catheter is straightened in the straightening sleeve as much as possible in order to be pushed later to a target stenosed position in the patient; further, after the ureteral catheter together with the guide sleeve reaches the target position under the guidance of the guide wire, the guide sleeve, the guide wire and the like are removed, after the arc-shaped structure 5 is sleeved on the bladder and the ring-shaped structure 6 is sleeved on other positions, the arc-shaped structure 5 and the ring-shaped structure 6 preformed on the catheter body 1 are tensioned into the fastened arc-shaped structure 5 and the ring-shaped structure 6 by tensioning the stay wire 7, and then the proximal end of the stay wire 7 is locked on the joint part 3 by the straightening fixing device 8.

After the ureteral catheter is delivered to a designated stenotic site, a syringe or pressure pump is connected as a secondary channel through the second arm 32 and a two-way valve is opened, filling the balloon 2 with liquid until the balloon 2 is inflated, thereby completing the dilation of the stenotic site. The syringe or pressure pump is then removed and the two-way valve on the second arm 32 is closed, completing the placement of the ureteral catheter. Then, the first arm 31 is externally connected with a drainage bag for drainage of liquid in the bladder-ureter-kidney, urine in the bladder-ureter-kidney and the like enters the drainage cavity 12 through the drainage hole 13 and finally is discharged out of the patient, so that the balloon 2 can be expanded in the patient for a long time, and other operation operations are facilitated.

According to the embodiment of the disclosure, the drainage effect from the renal pelvis to the bladder in the balloon dilatation process is optimized by adjusting the tube body structure of the conventional balloon dilatation catheter, the risk of hydronephrosis is obviously reduced, the long-term effective holding position is ensured by the stay wire, balloon displacement caused by ureteral peristalsis, patient movement and the like is prevented, continuous accurate dilatation at a narrow position in a body is realized, the continuous dilatation of a narrow ureter in the body is expected to be kept, 30-90 days are kept, the problems that the balloon dilatation catheter can only be expanded in a short term and has poor long-term effect and the like are solved, and the catheter has excellent treatment effect on ureter stenosis.

Moreover, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.

While various embodiments of the present disclosure have been described in detail, the present disclosure is not limited to these specific embodiments, and various modifications and embodiments can be made by those skilled in the art on the basis of the concepts of the present disclosure, which modifications and modifications should fall within the scope of the claims of the present disclosure.

Claims (10)

1. An adjustable ureteral catheter comprises a tube body, wherein a double-cavity structure at least comprising an expansion cavity and a drainage cavity is arranged in the tube body, a balloon is arranged on the tube body, the expansion cavity is communicated with the balloon, a joint part is arranged at the proximal end part of the tube body, the expansion cavity and the drainage cavity extend to the proximal end part of the tube body and are connected with the joint part, the distal end part of the tube body is provided with at least one arc-shaped structure, and the tail end of the tube body is provided with an opening; the device is characterized in that a stay wire is arranged on the tube body, and the stay wire extends from a proximal end part to a distal end part along the outer side wall surface of the tube body and is used for tensioning the preformed arc-shaped structure into a fastening structure.

2. The ureteral catheter according to claim 1, characterized in that a stay wire fixing device is provided on the joint part, one end of the stay wire is fixedly connected with the arc-shaped structure, and the other end is connected with the straightening fixing device.

3. The ureteral catheter according to claim 1, characterized in that at least one loop-shaped structure can also be provided in the middle of the tube.

4. The ureteral catheter according to claim 1, characterized in that drainage holes are provided on the surface of the tube body.

5. The ureteral catheter according to claim 4, characterized in that the drainage holes are uniformly distributed on the drainage lumen in a straight line or in a spiral.

6. The ureteral catheter according to claim 4, characterized in that the distribution density and/or pore size of the drainage holes on the arc-shaped structure is greater than the distribution density and/or pore size of the drainage holes elsewhere on the drainage lumen.

7. The ureteral catheter according to claim 1, characterized in that a visualization ring is provided on both sides of the balloon.

8. The ureteral catheter according to claim 1, characterized in that the tail end of the expansion cavity is located at the middle section of the balloon, and a through hole is provided at the tail end of the expansion cavity to communicate with the balloon.

9. The ureteral catheter according to claim 1, characterized in that the joint has a Y-shaped structure comprising a first arm and a second arm that are mutually crossed, one end of the first arm being in communication with the drainage lumen, the other end of the first arm being for externally connecting a drainage bag; one end of the second arm is in communication with the expansion chamber.

10. The ureteral catheter according to claim 9, characterized in that a two-way valve enabling on-off is provided on the second arm.

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