A portable particle delivery ureteral stent

Abstract

This utility model relates to the field of medical devices, specifically to a ureteral stent capable of carrying particles, comprising: a tube body and a particle chamber structure; the front and rear ends of the tube body are curved into a pigtail shape; the tube body is a single through-hole serving as a drainage cavity; several drainage holes are provided on the curved portions of the front and rear ends of the tube body; a marker ring is provided on the tube body at the junction of the curved portion and the tube body; several radiopaque rings are provided on the tube body between two marker rings; the particle chamber structure is integrally formed with the tube body, and the particle chamber structure includes several particle chambers distributed laterally along the tube body. Each particle chamber is a cylindrical cavity, with one end of the cylindrical cavity serving as a particle placement channel. The entrance to the particle placement channel is sloped, and the bottom of the slope is a baffle to prevent the radioactive particles from slipping out. The cylindrical cavity is filled with radioactive particles. This utility model combines a ureteral stent with radioactive particles, and uses a single particle chamber with several particle chambers arranged laterally, making it simple to operate and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and more specifically, to a ureteral stent capable of carrying particles. Background Technology

[0002] The ureter is the passageway between the kidney and bladder that carries urine. Ureteral stents are a commonly used medical device in urological surgery. By placing a ureteral stent at the site of obstruction or narrowing in the ureter, it supports, dilates, and drains the ureter, maintaining normal urine flow. The ureteral stent, with its "J"-shaped bends at both ends, secures the stent within the ureter and prevents movement; hence, it is also called a double-J stent or double-pigtail catheter. It is suitable for various urinary tract stone surgeries, hydronephrosis, ureteral stricture dilation, bladder replacement, kidney transplantation, and other procedures. Surgically placed between the renal pelvis and bladder, it drains urine, prevents stone fragments from accumulating and causing blockage, and prevents ureteral stricture. The ureteral stent has several side holes, which increase the flow rate of urine and further prevent stone fragments from accumulating and causing blockage.

[0003] Ureteral tumors are common diseases of the urinary system that endanger human health. Based on the nature of the tumor, they can be divided into benign and malignant ureteral tumors. Benign tumors mainly include ureteral polyps, while malignant tumors include transitional cell carcinoma, transitional cell carcinoma combined with squamous cell carcinoma, and mucinous carcinoma. The main clinical manifestations include: painless gross hematuria; in advanced stages, tumor obstruction may lead to hydronephrosis and renal colic. Cystoscopy reveals bleeding from the ureteral orifice; tumors may prolapse from the lower segment of the ureter; urography shows filling defects in the ureter, dilation of the upper ureter, hydronephrosis, or non-visualization of the affected kidney; urine cytology reveals cancer cells; CT and MRI can show focal masses in the ureter.

[0004] Currently, the treatment for ureteral tumors involves the resection of the local lesion. If the malignancy is high or there is invasion of surrounding tissues and organs, a more extensive resection is required, such as a sleeve resection of the nephrology, ureterology, and bladder. For early-stage malignant tumors of the ureter or those accompanied by ureteral obstruction, particle radiotherapy can be performed. However, conventional external beam radiotherapy often exhibits drawbacks such as poor treatment efficacy, significant side effects, and inability to precisely target and kill tumors. Furthermore, there is a lack of suitable carriers for internal particle radiotherapy. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a ureteral stent capable of carrying particles.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] The present invention provides a ureteral stent capable of carrying particles, comprising: a tube body and a particle chamber structure;

[0008] The tube body is curved at the front and rear ends in a pig tail shape; the tube body is a single through-hole that serves as a drainage cavity; several drainage holes are provided at the curved parts at the front and rear ends of the tube body; a marker ring is provided at the junction of the curved part and the tube body; several imaging rings are provided on the tube body between two marker rings.

[0009] The tube body is equipped with a particle chamber structure, which is integrally formed with the tube body. The particle chamber structure includes several particle chambers distributed laterally along the tube body. Each particle chamber is a cylindrical cavity. One end of the cylindrical cavity is a particle placement channel. The entrance of the particle placement channel is sloping. The bottom of the slope is a baffle to prevent the radioactive particles from slipping out. The cylindrical cavity is filled with radioactive particles.

[0010] Furthermore, the tube body is made of polyurethane (TPU).

[0011] Furthermore, the foremost part of the curved sections at the front and rear ends of the tube body is a guide head.

[0012] Furthermore, the guide head gradually narrows, and the inner wall of the narrowed tube forms a guide wire channel.

[0013] Furthermore, the drainage hole is an elliptical hole along the radial direction of the tube body.

[0014] Furthermore, the particle placement channel entrance is smaller than the diameter of the radioactive particle, and the diameter of the particle chamber matches the diameter of the radioactive particle being placed.

[0015] Furthermore, the particle chamber is attached to the inside of the tube wall, occupying only a small portion of the drainage cavity.

[0016] Furthermore, the radioactive particles are I-125 radioactive particles.

[0017] Furthermore, several drainage auxiliary holes are provided on the tube between the two Mark rings.

[0018] Furthermore, the drainage auxiliary hole is an elliptical hole along the radial direction of the tube body.

[0019] This invention relates to a ureteral stent capable of carrying radioactive particles. The ureteral stent, combined with radioactive particles, not only supports, expands, and internally drains the ureter to maintain normal urine flow, but also provides effective radioactive particle therapy for early-stage ureteral tumors or those with ureteral obstruction. It solves the problems of unreliable particle carriers, inability to fix particles, and inability to precisely target radiation. The system employs a single particle chamber with several chambers arranged horizontally. This addresses the issues of uneven placement of particle chambers, leading to excessive or insufficient radiation to the tumor site, resulting in poor treatment efficacy or radiation damage to normal tissues. Furthermore, it allows doctors to determine the required number of radioactive particles based on the tumor's location and size. The system is simple to operate and convenient to use. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is an overall structural diagram of a particle-carrying ureteral stent according to the present invention;

[0022] Figure 2 This is a cross-sectional view of the end of a ureteral stent capable of carrying particles according to this utility model;

[0023] Figure 3 This is a partial structural cross-sectional view of the tube body in a ureteral stent capable of carrying particles according to this utility model;

[0024] Figure 4 This is a cross-sectional view of the particle chamber structure in a ureteral stent that can carry particles according to this utility model;

[0025] The attached diagram is labeled as follows: 1. Tube body; 2. Drainage cavity; 3. Drainage hole; 4. Marker ring; 5. Developing ring; 6. Particle chamber; 7. Particle placement channel; 8. Baffle; 9. Radioactive particle; 10. Guide head; 11. Drainage auxiliary hole. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] like Figures 1 to 4As shown, based on the current state of existing technical solutions, this utility model specifically develops a ureteral stent that combines a ureteral catheter with radioactive particles 9 and can carry radioactive particles 9 and iodine-125.

[0028] This invention relates to a ureteral stent capable of carrying iodine-125 radioactive particles 9, mainly comprising a tube body 1 and a particle chamber structure integrally formed with the tube body 1. The structural form and arrangement of the particle chamber structure are the key innovative aspects of this invention. The particle chamber structure consists of several single-particle chambers 6 distributed transversely along the tube body 1 on the tube body 1 of the ureteral stent, and integrally formed with the tube body 1.

[0029] The ureteral stent's tube body 1 is made of imported polyurethane (TPU), which has good biocompatibility, excellent elasticity, and is not easily deformed. It is 20-30 cm long, 8-10 Fr in diameter, double-ended, and double-J-shaped. Tube body 1 has a dual-lumen structure: a drainage lumen 2 and a particle chamber. The drainage lumen 2 occupies the majority of the lumen, while the particle chamber, a particle-filled structure attached to the tube wall, occupies a smaller portion. Marking rings 4 are embedded in the tube wall at the connection points of the bent portions at both ends of tube body 1. These marking rings allow doctors to determine whether the ureteral bend is within the renal pelvis with the aid of imaging instruments such as CT scans. The leading edge of the bent portion of tube body 1 is a guide head 10 with a 3-4 mm tapered end, within which a guidewire channel is located. Several symmetrically distributed drainage holes 3 are located on both sides of the bent tube wall. The drainage holes 3 are elliptical holes along the radial direction of the lumen, maximizing drainage while ensuring the support strength of the tube wall.

[0030] The wall thickness of the middle section of the ureteral stent tube body 1 is 0.2 mm, and a row of particle chambers 6 is radially distributed along the entire length of the tube body 1. The particle chambers 6 are attached to the tube wall and do not affect the external circular outline of the ureteral stent, only occupying a small portion of the space in the drainage lumen 2. Each particle chamber 6 is a cylindrical cavity of 0.6 mm × 5 mm or 0.36 mm × 5 mm, suitable for placing 0.6 mm × 5 mm or 0.36 mm × 5 mm I-125 radioactive particles 9. The front end of the cylindrical cavity has a particle placement channel 7 with an opening 0.2 mm wide. The inlet extends from the outer wall of the tube body 1 in a sloping shape, and the bottom of the slope has a baffle 8 to prevent the radioactive particles 9 from slipping out. The opening of the particle placement channel 7 is smaller than the diameter of the radioactive particle 9. The diameter of the particle chamber 6 perfectly matches the radioactive particle 9, leaving no gaps. This is to ensure that the outer wall of the particle chamber 6 tightly embraces the radioactive particle 9, preventing it from slipping and being lost after placement. Particle chambers 6 are arranged transversely in the middle section of the ureteral stent, with a spacing of 5mm between each chamber. The design of the entire particle chamber 6 allows doctors to accurately load the required dose of radioactive particles 9 based on the location and size of the cancerous tissue, enabling precise radiotherapy.

[0031] Drainage auxiliary holes 11 are designed every 3-4 cm on the wall of the tube body 1. The drainage auxiliary holes 11 are elliptical holes distributed radially along the tube wall. The drainage auxiliary holes 11 can help the drainage cavity 2 achieve the maximum drainage effect. Starting from the marker ring 4 at one end of the tube body 1 where it bends, there are radiopaque rings 5 ​​every 5 cm to indicate the length. The radiopaque rings 5 ​​surround the circumference of the tube body 1. Doctors can use instruments to determine the movement of the tube body 1 and the determination of the placement position when the ureter is placed.

[0032] The method of using the particle-carrying ureteral stent of this invention is as follows:

[0033] 1. Use instruments such as CT scans to determine the location, size, and other data of tumors in the ureter.

[0034] 2. Determine the number of particles required for the radiation dose based on the instrument data.

[0035] 3. In a protected operating room, the required dose of radioactive particles 9 are loaded into the particle chamber 6 of the ureteral stent.

[0036] 4. Using instruments such as CT scanners, a guidewire is inserted from the patient's urethra into the bladder, and then passes retrogradely through the ureter to the renal pelvis.

[0037] 5. Insert the ureteral stent containing radioactive particles 9 into the guidewire, apply lubricant, and advance the ureteral stent into the patient's ureter along the guidewire.

[0038] 6. Using imaging instruments such as CT scanners, observe the position of the Mark ring 4 of the ureteral stent in the ureter to determine whether it has been implanted correctly.

[0039] 7. After the delivery is complete, pull out the guide wire. The operation is now complete.

[0040] The beneficial effects of this utility model are as follows:

[0041] 1. The combination of ureteral stent and iodine-125 radioactive particles can not only support, dilate and drain the ureter to maintain normal urine flow, but also provide effective radioactive particle therapy for early-stage ureteral malignancies or those with ureteral obstruction. At the same time, it solves the problems of the lack of reliable carriers for particles, the inability to fix them, and the inability to perform precise radiotherapy.

[0042] 2. A single particle chamber 6 is used, with several particle chambers 6 arranged horizontally. This solves the problem of uneven placement of particle chambers 6, which can lead to poor treatment effects or radiation damage to normal tissues due to excessive or insufficient radiation to the tumor site. It also allows doctors to determine the required number of radiation particles based on the location and size of the tumor.

[0043] 3. The diameter of the particle chamber 6 is exactly the same as the diameter of the radioactive particles 9 it is filled with, leaving no gaps, and can firmly hold the particles so that they will not shift or fall off.

[0044] 4. The opening of the particle placement channel 7 is smaller than the diameter of the radioactive particle 9. The inclined particle channel has a certain angle difference with the particle chamber 6, and there is an anti-slip baffle 8 at the bottom of the slope, which can also prevent the loaded radioactive particles 9 from shifting or escaping, making the radioactive particles 9 more stable.

[0045] 5. The drainage auxiliary hole 11 can help the drainage cavity 2 achieve the maximum drainage effect.

[0046] 6. The curved portions at both ends of the ureteral stent tube 1 are connected to the tube body 1 by the Mark rings 4 embedded in the tube wall. This allows doctors to determine, with the help of imaging instruments such as CT, whether the curved portion of the ureteral stent is in the renal pelvis or bladder, and to better determine whether the ureteral stent has been properly deployed.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A ureteral stent capable of carrying particles, characterized in that, include: Tube body and particle chamber structure; The front and rear ends of the tube are bent into a pig tail shape; the tube is a through single cavity, serving as a drainage cavity; several drainage holes are provided on the bent parts of the front and rear ends of the tube; a marker ring is provided on the tube at the junction of the bend and the tube; several imaging rings are provided on the tube between two marker rings. The tube body is provided with the particle chamber structure, which is integrally formed with the tube body. The particle chamber structure includes a plurality of particle chambers distributed laterally along the tube body. Each particle chamber is a cylindrical cavity. One end of the cylindrical cavity is a particle placement channel. The entrance of the particle placement channel is sloping, and the bottom of the slope is a baffle to prevent the radioactive particles from slipping out. The cylindrical cavity is filled with radioactive particles.

2. The ureteral stent capable of carrying particles according to claim 1, characterized in that, The tube body is made of polyurethane (TPU).

3. The ureteral stent capable of carrying particles according to claim 1, characterized in that, The front end of the curved section at the front and rear ends of the tube is a guide head.

4. A ureteral stent capable of carrying particles according to claim 3, characterized in that, The guide head tapers into a tapering shape, with the guide wire channel located inside the tapering tube wall.

5. A ureteral stent capable of carrying particles according to claim 1, characterized in that, The drainage hole is an elliptical hole along the radial direction of the tube body.

6. A ureteral stent capable of carrying particles according to claim 1, characterized in that, The particle placement channel entrance is smaller than the diameter of the radioactive particle, and the diameter of the particle chamber matches the diameter of the radioactive particle being placed.

7. A ureteral stent capable of carrying particles according to claim 1, characterized in that, The particle chamber is attached inside the tube wall of the tube body, occupying only a small portion of the space of the drainage cavity.

8. A ureteral stent capable of carrying particles according to claim 1, characterized in that, The radioactive particles are I-125 radioactive particles.

9. A ureteral stent capable of carrying particles according to claim 1, characterized in that, Several drainage auxiliary holes are provided on the tube body between the two Mark rings.

10. A ureteral stent capable of carrying particles according to claim 9, characterized in that, The drainage auxiliary hole is an elliptical hole along the radial direction of the tube body.

Images