CN220530493U - Anti-reflux ureteral stent - Google Patents

Abstract

The present application relates to the technical field of medical devices, and in particular to an anti-reflux ureteral stent comprising a ureteral segment for being indwelled in a patient ureter; a renal pelvis section connected to one end of the ureter section and configured to reside in a patient's renal pelvis; a suspension segment for indwelling in a patient's bladder; one end of the hanging thin wire is connected with the ureter section, and the other end of the hanging thin wire is connected with the hanging section; the ureter section and the renal pelvis section are internally provided with an inner cavity channel which is communicated with each other, and the ureter section and the renal pelvis section are both provided with a urethral catheterization hole which is communicated with the inner cavity channel. The support that this application provided can not be forced to strut at the application in-process, and the original urine anti-reflux mechanism of urinary system is reserved to the at utmost to effectively reduce the palirrhea condition appears between urine through support inner chamber, support and ureter wall seam, provide better anti-reflux function.

Description

Anti-reflux ureteral stent

Technical Field

The application relates to the technical field of medical instruments, in particular to an anti-reflux ureteral stent.

Background

After the ureteral lithotripsy, percutaneous renal lithotripsy, lithotomy, ureteral stenoses, etc. are relieved, a doctor usually leaves a ureteral stent for discharging lithotripsy or preventing postoperative ureteral stenoses, etc.; although ureteral stents offer great convenience for patient recovery, there are also corresponding post-implantation complications, such as: bladder irritation, stent tuberculosis, urinary reflux, etc. Wherein, more than 80 percent of patients have the phenomenon of urine reflux, the urine reflux during urination can cause the rapid rise of the intrarenal pressure, the pain of waist is caused, and a plurality of complications such as hydronephrosis, pyelonephritis and the like can be seriously caused.

The reverse flow of urine is mainly caused by temporarily destroying the anti-reverse flow mechanism of the vesicoureteral orifice after the stent is placed, so that urine flows back through the inner cavity of the stent, the stent and the ureteral wall joint. The anti-reflux stent in the related art is designed by adopting a pressure closed bag or a stent jacket, and under the condition that the pressure in the bladder is increased, the closed bag or the stent jacket at the bladder end of the stent can be closed along with the pressure increase to block the reflux of urine in the bladder through the stent. Although the technology can alleviate the symptom of urine reflux to a certain extent, the situation of the reflux of the stent and the ureteral wall suture is not solved, and an anti-reflux stent with better anti-reflux function is needed.

Disclosure of Invention

In order to effectively reduce the occurrence of reflux between the stent and the ureteral wall suture and provide a better anti-reflux function, the application provides an anti-reflux ureteral stent.

The application provides an anti-reflux ureteral stent which adopts the following technical scheme:

an anti-reflux ureteral stent, comprising:

a ureteral segment for indwelling in a patient ureter;

a renal pelvis section connected to one end of the ureter section and configured to reside in a patient's renal pelvis;

a suspension segment for indwelling in a patient's bladder;

one end of the hanging thin wire is connected with the ureter section, and the other end of the hanging thin wire is connected with the hanging section;

the ureter section and the renal pelvis section are internally provided with an inner cavity channel which is communicated with each other, and the ureter section and the renal pelvis section are both provided with a urethral catheterization hole which is communicated with the inner cavity channel.

By adopting the technical scheme, the stent is implanted into a patient after operation, wherein the ureter section is positioned in a patient ureter, the renal pelvis section is positioned in a patient renal pelvis, the hanging section is positioned in a patient bladder, and the hanging fine wire passes through the ureter opening of the patient bladder to hang the hanging section in the area close to the ureter opening in the patient bladder. Through the support in this scheme, the urine in the renal pelvis passes through the urethral catheterization hole of renal pelvis section, and through the inner channel in renal pelvis section and the ureter section, in the urethral catheterization hole of rethread ureter section flows to the ureter, and then slowly flows into the bladder through patient's vesicoureteral orifice to this reaches the catheterization function. Meanwhile, when the urine stored in the bladder reaches a certain amount, the brain transmits a urination instruction, the detrusor muscle of the bladder contracts, and the pressure in the bladder rises; at this time, because the support does not prop up the vesicoureteral orifice, the vesicoureteral orifice is in the closed state, and anti-reflux mechanism takes effect, and urine can not be by the high pressure backward flow in the bladder to the kidney in, only can discharge outside the body through the urethra that the sphincter is relaxed, reduces the condition that the backward flow appears between support and the ureteral wall seam, on the other hand, also can effectively reduce the condition that urine is through the support inner chamber backward flow, finally obtains better anti-reflux function.

Further, the hanging sections are provided in a coiled configuration.

By adopting the technical scheme, the hanging section possibly has a movement trend close to the vesicoureteral orifice under the action of ureteral peristalsis, and the hanging section is arranged into a coiled structure, so that the coiled outer Zhou Xian of the hanging section is in contact with the bladder wall, the movement trend of the majority is counteracted, and the situation that the anti-reflux mechanism is damaged due to the contact of the hanging section and the vesicoureteral orifice is avoided to a great extent.

Further, the suspension section includes a coil outer section and a coil inner section located inside the coil outer section; and a hanging position for connecting the hanging fine wires is arranged on the inner side section of the coil.

By adopting the technical scheme, the hanging section is connected and hung by the hanging thin wire and is positioned in the inner side area of the coil structure of the hanging section, so that even if the hanging section is contacted with the vesicoureteral orifice, the contact area between the hanging section and the vesicoureteral orifice can be increased, and the possibility that the anti-reflux mechanism of the urine at the vesicoureteral orifice is destroyed is greatly reduced.

Further, the hanging position is provided as a hanging hole, and the length extension line of the hanging hole is parallel to the coiling surface of the hanging section.

By adopting the technical scheme, under the condition that the hanging section has a movement trend close to the vesicoureteral orifice, a larger contact area is formed between the hanging section and the vesicoureteral orifice, so that the possibility that the anti-reflux mechanism of the urine at the vesicoureteral orifice is damaged is reduced.

Further, the suspension section is provided with a guide hole through which a guide wire can pass, and the guide hole is provided to extend in the coil direction of the suspension section.

By adopting the technical scheme, the guide wire is convenient to guide the placement of the hanging section.

Further, the coil number n of the hanging section is less than or equal to 3.

By adopting the technical scheme, the condition that the suspended section is overlarge in volume due to overlarge turns, so that the suspended section is deposited in the bladder after being left is avoided, and the discomfort of a patient is increased is reduced.

Further, the ureter section is provided with a connecting position for connecting the hanging fine wire, and the connecting position and the end part of the ureter section far away from the renal pelvis section are provided with reserved sections for forming the ureter section at intervals.

Through adopting above-mentioned technical scheme, the setting of reserve section is favorable to the doctor to customize according to patient ureter length and postoperative ureter stenosis condition and tailors and make the perfect ureter that coincide of support length.

Further, the renal pelvis section is provided in a coiled structure, and the inner cavity of the renal pelvis section is extended along the coiling direction of the renal pelvis section.

By adopting the technical scheme, the renal pelvis section is convenient to fix in the renal pelvis, and the arrangement of the inner cavity channel is also convenient for guiding the coiled renal pelvis section into a patient by adopting the guide wire.

Further, the axis of the urethral catheterization hole on the renal pelvis section is perpendicular to the coiled surface of the renal pelvis section.

By adopting the technical scheme, urine in the renal pelvis is conveniently guided.

Further, at least two urethral catheterization holes are arranged on the renal pelvis section and the ureter section at intervals.

By adopting the technical scheme, a good urine diversion function is formed, and the situation that the normal urethral catheterization function is influenced because individual urethral catheterization holes are shielded is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

the vesicoureteral orifice is not forced to be opened, and the original urine anti-reflux mechanism of the urinary system is reserved to the greatest extent, so that the reflux condition between the stent and the ureteral wall joint is effectively reduced, the reflux condition of urine passing through the inner cavity of the stent can be reduced, and a better anti-reflux function is provided;

when the stent is placed, the stent can be customized and cut according to the ureter length of a patient and the ureter stenosis after operation so that the stent length is perfectly matched with the ureter;

in the case of a suspension segment with a tendency to move closer to the vesicoureteral orifice, the outer coil Zhou Xian of the suspension segment contacts the bladder wall, counteracting the tendency of most of the movement, largely avoiding the situation where the suspension segment contacts the vesicoureteral orifice, destroying the anti-reflux mechanism.

Drawings

Fig. 1 is a schematic structural view of an anti-reflux ureteral stent according to an embodiment of the present application;

fig. 2 is a schematic view of the relative position of the anti-reflux ureteral stent and a human body according to an embodiment of the present application;

fig. 3 is a schematic diagram illustrating the construction of a renal pelvis section in an embodiment of the present application;

FIG. 4 is a schematic diagram for showing a hanging section structure in an embodiment of the present application;

fig. 5 is a schematic diagram for illustrating the structures of ureteral segments and renal pelvis segments in an embodiment of the present application.

Reference numerals illustrate: 1. a ureter section; 11. a connection hole; 12. reserving a section; 2. a renal pelvis segment; 3. a hanging section; 31. a hanging hole; 32. a guide hole; 4. hanging a fine wire; 5. a urine guiding hole.

Description of the embodiments

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses an anti-reflux ureteral stent.

Referring to fig. 1 and 2, an anti-reflux ureteral stent as disclosed in an embodiment of the present application comprises a ureteral section 1, a renal pelvis section 2, a hanging section 3, and a hanging filament 4, wherein the ureteral section 1 is intended to be left in the patient ureter, and after the stent is placed in the patient, the proximal end of the ureteral section 1 is also in the patient ureter without passing through the vesicoureteral orifice; the renal pelvis section 2 is connected to the distal end of the ureter section 1 and is intended to be indwelling in the patient's renal pelvis. Meanwhile, in the present embodiment, the renal pelvis section 2 and the ureter section 1 are integrally formed tube bodies; in other embodiments, the renal pelvis section 2 and the ureter section 1 may also be provided as separate tubes that are secured together by welding.

It should be noted that, the proximal end or the distal end of the ureter section 1 is a reference object with respect to the operator, specifically, the proximal end of the ureter section 1 is closer to the operator than the distal end, and if the patient is the reference object, the distal end of the ureter section 1 extends into the patient body more than the proximal end. The same explanation as for the proximal or distal end will be made hereinafter.

It will be appreciated that the renal pelvis section 2 is connected to the distal end of the ureter section 1, either by the fact that some portion of the renal pelvis section 2 extends into the ureter to connect to the distal end of the ureter section 1, or by the fact that the distal end of the ureter section 1 extends into the renal pelvis to connect to the renal pelvis section 2; it will also be appreciated that the vesicoureteral orifice described above represents the connection of the human bladder to the ureter.

Meanwhile, with reference to fig. 3, the ureter section 1 and the renal pelvis section 2 are both internally provided with inner cavities, and the inner cavities of the ureter section 1 and the renal pelvis section 2 are communicated, and the ureter section 1 and the renal pelvis section 2 are also provided with urethral catheterization holes 5 communicated with the inner cavities so as to achieve the effect of guiding urine.

With reference to fig. 1 and 2, the suspension segment 3 is intended to be left in the patient's bladder as a stressed structure for subsequent removal of the stent, e.g. for clamping or suction, etc. Meanwhile, one end of the hanging fine wire 4 is connected to the ureter section 1, and the other end of the hanging fine wire is connected to the hanging section 3, so that the purpose of connecting the hanging section 3 with the ureter section 1 is achieved.

It will be appreciated that the suspension string 4 is merely indicative of a relatively small diameter, so that reflux between the stent and the ureteral wall may be effectively reduced, and in particular embodiments, the suspension string 4 may be made to have a diameter of less than or equal to 0.2mm; also, in some embodiments, to ensure that the suspended suspension segment 3 is in the bladder, the suspension length of the suspension string 4 may be made greater than or equal to 100mm.

With the above design, the stent is implanted into the patient after the operation, ureter section 1 is in the patient ureter, renal pelvis section 2 is in the patient renal pelvis, hanging section 3 is in the patient's bladder, and hanging filament 4 passes through the patient's vesicoureteral orifice to hang hanging section 3 in the area inside the patient's bladder near the vesicoureteral orifice. Urine in the renal pelvis flows out into the ureter through the urethral catheterization hole 5 of the renal pelvis section 2, through the inner cavity channels in the renal pelvis section 2 and the ureter section 1, then flows into the bladder through the urethral catheterization hole 5 of the ureter section 1, and finally flows into the bladder through the vesicoureteral orifice of the patient slowly, so that the urethral catheterization function is achieved.

Meanwhile, when the urine stored in the bladder reaches a certain amount, the brain transmits a urination instruction, the detrusor muscle of the bladder contracts, and the pressure in the bladder rises; at this time, because the support does not prop up the vesicoureteral orifice, the vesicoureteral orifice is in the closed state, and anti-reflux mechanism is effective, and urine can not be by the high pressure backward flow in the bladder to in the kidney, only can discharge outside the body through the urethra that sphincter is diastolic to reduce the condition that appears backward flow between support and the ureteral wall seam, provide better anti-reflux function.

It should be noted that, the above-mentioned indicates a urine guiding path based on the stent structure, and the urine guiding path of the human body itself may also exist at the same time, specifically, urine in the renal pelvis may enter the ureter through the ureter opening of the renal pelvis and slowly flow into the bladder through the ureter opening of the bladder. It is understood that the ureteral orifice of the renal pelvis refers to the connection port of the renal pelvis with the ureter of the human body.

Further, referring to fig. 1 and 3, in some embodiments, the urethral catheterization holes 5 on the renal pelvis section 2 and the ureter section 1 are at least two and equally spaced, so as to form a good urine guiding function, and reduce the situation that the normal catheterization function is affected because the individual catheterization holes 5 are blocked. In some specific embodiments, the spacing between two adjacent catheterization holes 5 on the renal pelvis section 2 may be set to 4-8mm and the spacing between two adjacent catheterization holes 5 on the ureter section 1 may be set to 20-50mm.

Further, referring to fig. 3, in some embodiments, the renal pelvis section 2 is provided in a coiled configuration, with the internal lumen of the renal pelvis section 2 extending along the coiled direction of the renal pelvis section 2. The arrangement of the inner lumen also facilitates guiding the coiled renal pelvis section 2 into the patient using a guide wire, while the coiled configuration of the renal pelvis section 2 facilitates fixation of the renal pelvis section 2 within the renal pelvis. At the same time, the axis of the catheterization hole 5 on the renal pelvis section 2 is arranged perpendicular to the coiled surface of the renal pelvis section 2 in order to guide urine in the renal pelvis.

The coil structure according to the present embodiment is a structure having a spiral rotation, and in this embodiment, the radius of rotation of the spiral rotation is gradually reduced, and the coil axes of the coil structure are substantially in the same plane, which may be referred to as a coil surface. In other embodiments, however, the radius of gyration of the convolutions may remain constant throughout the convolutions of a certain degree, in which case the axis of the convolutions is helically shaped.

With reference to fig. 1 and 2, further, in some embodiments, the suspension section 3 is configured as a coiled structure; when the device is actually applied in a patient, the hanging section 3 possibly forms a movement trend close to the vesicoureteral orifice under the action of ureteral peristalsis, and the outer Zhou Xian of the hanging section 3, which is coiled, can be in contact with the bladder wall by arranging the hanging section 3 in a coiled structure, so that the movement trend of most parts is counteracted, and the situation that the anti-reflux mechanism is destroyed due to the contact of the hanging section 3 with the vesicoureteral orifice is avoided to a great extent.

In some specific embodiments, if the number of coils of the suspension section 3 is denoted by n, n is less than or equal to 3, so that the situation that the discomfort of a patient is increased due to the accumulation of the suspended section 3 in the bladder after the suspension section 3 is left due to the excessive number of coils under the condition that the damage to the reflux mechanism function is reduced can be reduced.

With reference to fig. 2 and 4, further, in some embodiments, the suspension section 3 may be divided into an outer coil section and an inner coil section located inside the outer coil section; correspondingly, a hanging position for connecting the hanging fine wires 4 is arranged on the inner section of the coil. Therefore, the position of the hanging section 3, which is connected and hung by the hanging thread 4, is positioned in the inner side area of the coiled structure of the hanging section 3, so that even if the contact with the vesicoureteral orifice is made, the contact area between the hanging section 3 and the vesicoureteral orifice can be increased, and the possibility that the anti-reflux mechanism of the urine at the vesicoureteral orifice is destroyed is greatly reduced.

Further, in some embodiments, the hanging locations are provided as hanging holes 31, and the length extension of the hanging holes 31 is parallel to the coiled face of the hanging section 3. It will be appreciated that the suspension apertures 31 may be provided as circular apertures or as square apertures, but at least indicate that the suspension apertures 31 have a length extension and thus a corresponding length extension line. In particular in the present embodiment, the suspension hole 31 is provided as a circular hole, the axis of the suspension hole 31 corresponds to its length extension line, and the axis of the suspension hole 31 may be made to intersect with the central axis of the suspension segment 3.

Further, with reference to fig. 4, in some embodiments, a guide hole 32 through which a guide wire can pass is provided in the suspension section 3, and the guide hole 32 is provided to extend in the coil direction of the suspension section 3, so as to facilitate guided placement during placement of the suspension section 3 by the guide wire passing through the guide hole 32.

Further, referring to fig. 5, in some embodiments, ureter section 1 is also provided with a connection site for connection of hanging fine wire 4, the connection site and the proximal end of ureter section 1 have a reserved section 12 with a distance to form ureter section 1, and the arrangement of reserved section 12 is beneficial for a doctor to customize and cut according to the ureter length of a patient and the stenosis condition of the ureter after operation so that the stent length perfectly fits the ureter of the patient. Also based on design experience, in some specific embodiments, the length of the reserved section 12 may be set to be greater than or equal to 50mm. Furthermore, in the present embodiment, the connection site on the ureteral section 1 is set as the connection hole 11.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. An anti-reflux ureteral stent, comprising:

a ureteral segment for indwelling in a patient ureter;

a renal pelvis section connected to one end of the ureter section and configured to reside in a patient's renal pelvis;

a suspension segment for indwelling in a patient's bladder;

one end of the hanging thin wire is connected with the ureter section, and the other end of the hanging thin wire is connected with the hanging section;

the ureter section and the renal pelvis section are internally provided with an inner cavity channel which is communicated with each other, and the ureter section and the renal pelvis section are both provided with a urethral catheterization hole which is communicated with the inner cavity channel.

2. The anti-reflux ureteral stent according to claim 1, characterized in that the suspension segments are provided in a coiled configuration.

3. The anti-reflux ureteral stent according to claim 2, characterized in that the suspension section comprises a coil outer section and a coil inner section that is coiled inside the coil outer section; and a hanging position for connecting the hanging fine wires is arranged on the inner side section of the coil.

4. The anti-reflux ureteral stent according to claim 3, characterized in that the suspension locations are provided as suspension holes, the length extension of which is parallel to the coiled face of the suspension section.

5. The anti-reflux ureteral stent according to claim 2, characterized in that the suspension section is provided with a guide hole through which a guide wire can pass, the guide hole being arranged extending in the coiling direction of the suspension section.

6. The anti-reflux ureteral stent according to claim 2, characterized in that the number of coils n of the suspension segment is less than or equal to 3.

7. The anti-reflux ureteral stent according to claim 1, characterized in that the ureteral section is provided with a connection site for the connection of the hanging thread, the connection site having a distance from the end of the ureteral section remote from the renal pelvis section to form a preformed section of the ureteral section.

8. The anti-reflux ureteral stent according to claim 1, characterized in that the renal pelvis section is provided in a coiled configuration, the endoluminal tract of the renal pelvis section being provided extending in the coiled direction of the renal pelvis section.

9. The anti-reflux ureteral stent according to claim 8, characterized in that the axis of the urethral catheterization hole on the renal pelvis section is perpendicular to the coiled face of the renal pelvis section.

10. The anti-reflux ureteral stent according to claim 1, characterized in that the urethral catheterization holes on the renal pelvis section and the ureter section are at least two and are arranged at intervals.