Ureteral stent

Abstract

The application discloses a ureteral stent, and aims to solve the problems in the prior art, and provides a ureteral stent which can detect whether the ureteral stent reaches a renal pelvis and can reduce stimulation to a urinary bladder. The ureteral stent comprises a stent body which can be inserted into a ureter, a J-shaped curled end of the stent body which is inserted into the renal pelvis is provided with a channel for urine inflow, a measuring wire is arranged at a head end of the J-shaped curled end, the measuring wire is arranged close to an outer side wall of a bent section of the J-shaped curled end, a first end of the measuring wire is arranged at the head end of the J-shaped curled end, and a tail end of the measuring wire is arranged beyond a tail end of the stent body. In the curling process of the J-shaped curled end, the tail end of the measuring wire can move relative to the tail end of the stent body under the deformation effect of the outer side of the J-shaped curled end.

Description

Technical Field

[0001] This invention relates to the field of ureteral surgical instruments, and more specifically to a ureteral stent for the treatment of ureteral stricture and ureteral stones. Background Technology

[0002] Ureteral stents are commonly used medical devices in urology. They are hollow tubes with one end placed in the renal pelvis and the other end placed in the bladder. The ureteral stent connects the renal pelvis and the bladder, allowing urine secreted by the kidneys to pass smoothly through the ureter. They are widely used in the treatment of ureteral stricture and ureteral stones.

[0003] The device currently has the following problems:

[0004] 1. Difficulty in determining proper placement of the ureteral stent: For the ureteral stent to be properly positioned, its J-shaped tip needs to reach the renal pelvis. However, due to the narrowness of the ureter, once the stent is inserted, it's impossible to place a camera. Therefore, currently, there is no effective method to determine intraoperatively whether the J-shaped tip has reached the renal pelvis; it relies solely on the surgeon's experience. Consequently, the stent often deflects within the ureter or fails to reach the renal pelvis distally, resulting in ineffective placement. These situations can only be verified through postoperative X-rays.

[0005] 2. Traditional ureteral stents cause significant irritation to the bladder: There is a sensitive triangular area near the ureterovesical inlet, known as the trigone of the bladder. Mechanical stimulation of this area will cause patients to experience urinary urgency and pain. Existing ureteral stents, in order to achieve fixation within the renal pelvis and bladder, must have two J-shaped structures at the head and tail to prevent stent dislodgement. However, the J-shaped structures within the bladder can easily rub against the trigone of the bladder, causing discomfort.

[0006] 3. Compared to conventional ureteral stents, the new fishtail ureteral stent currently available in clinical practice has eliminated the J-shaped structure at the bladder end and replaced it with several silk threads. Although this greatly improves the stimulation of the bladder, the silk threads are more likely to flow with water and often drag out of the urethra during urination, causing the stent to fall out. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a ureteral stent that can detect whether a ureteral stent has reached the renal pelvis and can reduce bladder irritation.

[0008] To solve the above-mentioned technical problems, the technical method adopted by the present invention is as follows: The present invention discloses a ureteral stent, including a stent body that can be inserted into the ureter, wherein the J-shaped coiled end of the stent body that extends into the renal pelvis is provided with a channel for urine inflow; the head end of the J-shaped coiled end is provided with a measuring wire, which is disposed close to the outer wall of the curved section of the J-shaped coiled end.

[0009] The metering wire is positioned at the J-shaped coiled end and extends beyond the end of the support body.

[0010] During the curling process of the J-shaped curled end, the end of the metering wire can travel relative to the end of the support body due to the deformation of the outer side of the J-shaped curled end.

[0011] Furthermore, a metering wire groove for placing the metering wire is provided along the outer wall of the curved section at the J-shaped curled end.

[0012] Furthermore, a sidewall notch is provided on the J-shaped curled end; the notch of the sidewall notch is located on the outer sidewall of the J-shaped curled end.

[0013] Furthermore, along the length direction of the measuring wire, a first mark and a second mark are sequentially provided at the end of the measuring wire; the distance from the first mark to the beginning of the measuring wire is less than the distance from the second mark to the beginning of the measuring wire.

[0014] When the J-shaped curled end has not completed bending, the first marking position remains outside the end of the bracket body;

[0015] When the J-shaped curled end completes only one bend, the first mark position enters the end of the support body, and the second mark position remains outside the end of the support body.

[0016] When the J-shaped curled end completes one or more bends, the second mark position enters the end of the support body.

[0017] Furthermore, the end of the support body is provided with a compressed tennis ball; the compressed tennis ball is in a strip shape in a compressed state, and its surface is coated with a hydrolyzable fixing adhesive; after the hydrolyzable fixing adhesive dissolves in water, the compressed tennis ball returns to a spherical hollow structure and has buoyancy.

[0018] Furthermore, the hydrolyzable fixative is dextrin.

[0019] Furthermore, the metering filament is made of nylon.

[0020] Furthermore, on the wall of the stent body, along the length of the stent body, there are several through-holes for urination. Beneficial effects

[0021] 1. Compared with existing technologies that cannot determine whether the J-shaped structure has reached the renal pelvis, this invention sets a measuring wire along the outer side of the curled end of the J-shaped structure. Since the outer side of the curled end of the J-shaped structure will inevitably be stretched and deformed when the curled end of the J-shaped structure is bent, the curling state of the J-shaped structure can be determined by observing whether the tail of the measuring wire has displacement relative to the end of the support body, and then determining whether it is placed in place.

[0022] 2. A side wall notch is provided on the J-shaped coiled end. The notch is located on the outer side wall of the J-shaped coiled end. The side wall notch increases the relative displacement between the inner and outer side walls of the J-shaped coiled end, which is beneficial for observing the displacement of the metering wire.

[0023] 3. When the compressed tennis ball leaves the factory, it is coated with a hydrolyzable fixative and then dried and compressed into a thin strip structure. When this structure comes into contact with urine in the bladder, the dextrin is dissolved by the urine and expands into a spherical hollow structure.

[0024] The inflated compressed tennis ball enters the bladder, expands, and floats at the top of the bladder, thus keeping it away from the trigone at the bottom of the bladder and reducing irritation;

[0025] At the same time, because the ball has a mesh structure and is buoyant, soft and easily deformable, even if there is no urine in the bladder, the contact between the tennis ball and the bottom of the bladder will be reduced due to the deformation of the tennis ball, thus reducing the stimulation to the trigone of the bladder.

[0026] At the same time, because the compressed tennis ball has a mesh structure, it is not easy to flow with water. Therefore, even if the tennis ball floats to the urethral opening, the urine can flow out of the urethra through the gaps in the tennis ball, which can reduce the direct impact of liquid on the tennis ball and make it less likely for the tennis ball to be washed out by urine.

[0027] At the same time, compared with existing silk threads, tennis balls have a certain shape, making them less likely to be pulled out through the urethra. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the unused state of the present invention;

[0029] Figure 2 This is a schematic diagram of the working state of the present invention. Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1As shown, this invention discloses a ureteral stent, including a stent body 1 that can extend into the ureter. Along the length of the stent body 1, several through-holes are provided on the wall of the stent body 1. The J-shaped coiled end 11 of the stent body 1, which extends into the renal pelvis, is provided with a channel for urine inflow. A metering wire groove 3 is provided along the outer wall of the curved section of the J-shaped coiled end 11 for placing a metering wire 2. The metering wire 2 is disposed within the metering wire groove 3, close to the outer wall of the curved section of the J-shaped coiled end 11. The first end of the metering wire 2 is located at the head end of the J-shaped coiled end 11, and the second end extends beyond the end of the stent body 1.

[0032] During the curling process of the J-shaped curled end 11, the end of the metering wire 2 can move relative to the end of the support body 1 due to the deformation of the outer side of the J-shaped curled end 11.

[0033] A sidewall notch 4 is provided on the J-shaped curled end 11; the notch of the sidewall notch 4 is located on the outer sidewall of the J-shaped curled end 11.

[0034] Along the length of the measuring wire 2, a first mark and a second mark are sequentially provided at the end of the measuring wire 2; the distance of the first mark from the front end of the measuring wire 2 is less than the distance from the measuring wire 2 to the front end of the measuring wire 2.

[0035] When the J-shaped coiled end 11 has not completed bending, the first mark position is left outside the end of the bracket body 1;

[0036] When the J-shaped coiled end 11 completes only one bend, the first mark position enters the end of the support body 1, and the second mark position remains outside the end of the support body 1.

[0037] When the J-shaped coiled end 11 completes one or more bends, the second mark position enters the end of the support body 1.

[0038] The support body 1 has a compressed tennis ball 5 at its end; the compressed tennis ball 5 is in a strip shape and its surface is coated with a hydrolyzable fixing adhesive; the hydrolyzable fixing adhesive dissolves in water, as... Figure 2 As shown, the compressed tennis ball 5 reverts to a spherical, hollow structure and possesses buoyancy. The metering wire 2 is made of nylon. The hydrolyzable fixing adhesive is dextrin.

[0039] Regarding the setting of the first and second marker positions, the first marker position can be determined when the J-shaped coiled end 11 completes only one bend, and the second marker position can be determined when the J-shaped coiled end 11 completes two bends. Alternatively, the positions of the first and second marker positions can be calculated based on the radius of curvature of the J-shaped coiled end 11 and the extension length of the outer wall of the J-shaped coiled end 11.

[0040] During use, the operator inserts a conventional guidewire into the ureteral stent and advances it to a specific location in the patient's ureter before withdrawing the guidewire. At this point, the distal end of the stent body 1 is located within the bladder. By observing the positional information of the first and second markers at the distal end of the stent body 1 using a cystoscope, a diagnosis can be made.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ureteral stent, comprising a stent body (1) capable of extending into the ureter, wherein the J-shaped coiled end (11) of the stent body (1) extending into the renal pelvis is provided with a channel for urine inflow; characterized in that: The J-shaped curled end (11) is provided with a metering wire (2), which is located close to the outer wall of the curved section of the J-shaped curled end (11). The metering wire (2) is positioned at the head end of the J-shaped coiled end (11) and extends beyond the end of the support body (1). During the curling process of the J-shaped curled end (11), the end of the metering wire (2) can travel relative to the end of the support body (1) due to the deformation of the outer side of the J-shaped curled end (11); Along the length direction of the measuring wire (2), a first mark and a second mark are sequentially provided at the end of the measuring wire (2); the distance from the first mark to the beginning of the measuring wire (2) is less than the distance from the second mark to the beginning of the measuring wire (2); When the J-shaped curled end (11) has not completed bending, the first mark position remains outside the end of the support body (1); When the J-shaped curled end (11) completes only one bend, the first mark position enters the end of the support body (1), and the second mark position remains outside the end of the support body (1); When the J-shaped curled end (11) completes one or more bends, the second mark position enters the end of the support body (1); The support body (1) has a compressed tennis ball (5) at its end; the compressed tennis ball (5) is in a strip shape when compressed and has a hydrolyzable fixing adhesive on its surface; after the hydrolyzable fixing adhesive dissolves in water, the compressed tennis ball (5) returns to a spherical hollow structure and has buoyancy.

2. The ureteral stent according to claim 1, characterized in that: A metering wire groove (3) for placing the metering wire (2) is provided on the outer wall of the curved section along the J-shaped curled end (11).

3. The ureteral stent according to claim 1, characterized in that: A sidewall notch (4) is provided on the J-shaped curled end (11); the notch of the sidewall notch (4) is located on the outer sidewall of the J-shaped curled end (11).

4. The ureteral stent according to claim 1, characterized in that: The hydrolyzable fixative is dextrin.

5. The ureteral stent according to claim 1, characterized in that: The metering wire (2) is made of nylon.

6. The ureteral stent according to claim 1, characterized in that: On the wall of the stent body (1), along the length of the stent body (1), there are a number of urination holes that penetrate the wall.

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