Ureteral stent bladder end auxiliary device

Abstract

The utility model discloses a ureteral stent bladder end auxiliary device which comprises a metal ball and a hollow tubular channel, and the metal ball is provided with a through hole matched with the outer diameter of the hollow tubular channel. The front end of the hollow tubular channel extends into the through hole from the tail end of the metal ball and is fixed to the tail end of the metal ball through the degradable fixing layer, and the rear end of the hollow tubular channel is used for being connected with a ureter support. A non-absorbable suture is wound on the outer wall of the hollow tubular channel, the front end of the non-absorbable suture penetrates through the degradable fixing layer and then is connected with the tail end of the metal ball, and the rear end of the non-absorbable suture is used for being connected with a ureteral stent. By means of the ureteral stent taking device, the invasive operation of taking the ureteral stent through a traditional cystoscope can be avoided, the medical cost is reduced, the iatrogenic injury risk is reduced, and secondary anesthesia is further avoided for a patient needing anesthesia.

Description

Technical Field

[0001] The utility model belongs to the field of medical devices, and particularly relates to an auxiliary device for the bladder end of a ureteral stent. Background Art

[0002] A ureteral stent, also known as a D-J tube, double-J tube or pigtail tube, is a tubular catheter placed in the ureter to keep it unobstructed. For a traditional double-J tube, both ends of the stent are J-shaped. The upper curled part is positioned in the renal pelvis, and the lower curled part is positioned in the bladder, playing the role of draining urine and passively dilating the ureter. Ureteral stents are widely used in urological surgeries. Ureteral stents are usually placed after upper urinary tract surgeries such as kidney stones, ureteral stones, hydronephrosis, kidney transplantation, and benign tumors of the kidney and ureter, as well as surgeries for diseases such as ureteral stricture dilation.

[0003] Ureteral stents are widely used in the treatment of upper urinary tract diseases. The current design requirements for ureteral stents are to reduce bladder irritation, the urinary tract infection rate, the stent encrustation rate, and to facilitate removal or biodegradability. Currently, the removal of ureteral stents mainly relies on removal under direct vision with a cystoscope. For patients with poor compliance (mainly young children or elderly patients with enlarged prostate), removal requires secondary anesthesia, which greatly increases the medical cost, and cystoscope operation may cause iatrogenic injuries.

[0004] As Figure 3 shown, the following new techniques are available for the removal of ureteral stents currently:

[0005] 1. Double-J tube with suture: The suture is fixed to a urinary catheter, a ureteral catheter, or directly fixed outside the body. When removing, the ureteral stent in the body is directly removed by pulling the suture, which is convenient and fast. However, this method is applicable to patients with short-term indwelling ureteral stents (generally not exceeding 7 days), and it will increase the risk of urinary tract infection, and there may also be discomfort such as lower urinary tract symptoms caused by the suture.

[0006] 2. Magnetic double-J tube: Based on the principle of magnetic attraction between opposite poles, one end of a magnet is fixed to the bladder segment of the ureteral stent, and the other end is fixed to the catheter end. The ureteral stent can be quickly removed through invasive catheterization operation. However, this method is still an invasive operation. For patients with poor compliance, secondary anesthesia is still required, and the magnet model is not suitable for young children. The magnet cannot smoothly pass through the urethra of young children, so its application in children is limited.

[0007] 3. Biodegradable double-J tube: The biodegradable material enables the stent to be completely degraded under controlled conditions and excreted from the body. Currently, the technology is not yet mature and the economic cost is high. How to ensure effective mechanical properties while enabling the stent to be fully degraded within a given time and avoiding degradation fragments from blocking the ureter is the key problem that current biodegradable stents need to solve. Content of the Utility Model

[0008] The utility model provides an auxiliary device for the bladder end of a ureteral stent, which can simply, efficiently and low-costly remove the ureteral stent.

[0009] An auxiliary device for the bladder end of a ureteral stent includes a metal ball and a hollow tubular channel. The metal ball is provided with a through hole matching the outer diameter of the hollow tubular channel.

[0010] The front end of the hollow tubular channel extends into the through hole from the tail end of the metal ball and is fixed to the tail end of the metal ball through a degradable fixing layer. The rear end of the hollow tubular channel is used to connect to the ureteral stent.

[0011] The outer wall of the hollow tubular channel is wound with non-absorbable sutures. The front end of the non-absorbable sutures passes through the degradable fixing layer and is connected to the tail end of the metal ball. The rear end of the non-absorbable sutures is used to connect to the ureteral stent.

[0012] The present invention is an improvement based on a suture-equipped ureteral stent. The degradable fixing layer degrades within a required time to activate the auxiliary device. The metal ball at the head end is excreted through the urethra by the patient's spontaneous urination and pulls out the non-absorbable sutures out of the body. The ureteral stent can be removed by pulling the metal ball and the non-absorbable sutures that have been excreted out of the body.

[0013] Preferably, the outer diameter of the metal ball is 3-5 mm, and the diameter of the through hole of the metal ball is 0.9-1.1 mm.

[0014] Preferably, the material of the metal ball is brass or 304 stainless steel. Brass and 304 stainless steel are commonly used materials for urethral sounders and will not cause irritation to the urethral and bladder mucosa.

[0015] Preferably, the material of the degradable fixing layer is a porous silicon-based material, which adopts a loose porous structure and has different dissolution rates under different pH urine.

[0016] Preferably, the total length of the non-absorbable sutures is 30-60 cm, and it is evenly wound on the outer wall of the hollow tubular channel, and the winding distance is 0.8-1.5 cm.

[0017] Preferably, the non-absorbable sutures adopt Prolene sutures.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model arranges metal balls, hollow tubular channels, degradable fixing layers and non-absorbable sutures that cooperate with each other. The degradable fixing layer degrades within a required time to start the auxiliary device. The metal ball at the head end is discharged through the urethra through the patient's spontaneous urination and pulls the non-absorbable suture out of the body, thereby avoiding the defects of the existing stent with sutures, such as high urinary tract infection rate, easy dislocation after long-term retention, and lower urinary tract symptoms (urethral discomfort, stinging, and urgency) caused by suture stimulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a ureteral stent bladder end auxiliary device of the utility model;

[0021] Figure 2 Schematic diagram of the degradation of the degradable fixed layer of the porous silicon material during the test;

[0022] Figure 3 A schematic diagram comparing the existing double J-tube structure with the present invention;

[0023] Figure 4 It is a schematic diagram of the connection between the utility model and the double J tube. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention and do not have any limiting effect on the present invention.

[0025] like Figure 1 As shown, a ureteral stent bladder end auxiliary device mainly includes a metal ball 1, a hollow tubular channel 2, a degradable fixing layer 3 and a non-absorbable suture 4.

[0026] The metal ball 1 is provided with a through hole that matches the outer diameter of the hollow tubular passage 2. In this embodiment, the metal ball 1 is made of brass or 304 stainless steel (brass and 304 stainless steel are commonly used materials for urethral probes and will not irritate the urethra and bladder mucosa). The outer diameter of the metal ball 1 is about 4 mm, which can be smoothly discharged from the urethra of the child. The diameter of the through hole is about 1 mm, which can pass the super-slip guide wire when placing the ureteral stent. The common size of the super-slip guide wire is 0.024″ (0.61 mm) or 0.035″ (0.89 mm).

[0027] The front end of the hollow tubular channel 2 extends from the rear end of the metal ball 1 into the through hole and is fixed to the rear end of the metal ball 1 through the degradable fixing layer 3. The rear end of the hollow tubular channel 2 is used to connect the ureteral stent.

[0028] The outer wall of the hollow tubular channel 2 is wound with non-absorbable sutures 4. The front end of the non-absorbable sutures 4 passes through the degradable fixation layer 3 and is connected to the tail end of the metal ball 1. The rear end of the non-absorbable sutures 4 is used to connect to the bladder end of the ureteral stent.

[0029] In this embodiment, the degradable fixation layer 3 is made of a porous silicon-based material. By adopting a loose porous structure, it can be slowly degraded in a specific alkaline urine environment. After degradation, the metal ball 1 is released. When the patient urinates, the metal ball 1 is discharged out of the body through the bladder outlet (bladder neck) via the urethra. The ureteral stent is removed by pulling the metal ball 1 and the non-absorbable sutures 4 discharged out of the body.

[0030] As Figure 2 shown, during the test process, the degradable fixation layer 3 of the porous silicon material remains stable or dissolves rapidly under different pH conditions, meeting the design requirements; this material has a loose porous structure, which can ensure uniform dissolution in urine, and the dissolution product is metasilicic acid, which has good biocompatibility and is safe and harmless.

[0031] The non-absorbable sutures 4 adopt Prolene sutures commonly used in clinics. The total length of the non-absorbable sutures 4 is 40 cm, and it is evenly wound on the outer wall of the hollow tubular channel 2, and the winding distance is about 1 cm.

[0032] Through a clever structural design, the present utility model dissolves the degradable fixation layer 3 of the porous silicon-based material in a specific pH environment to release the metal ball 1 and discharge it out of the body, and non-invasively removes the ureteral stent through the linkage device of "metal ball - non-absorbable suture - double-J tube".

[0033] As Figure 3 shown, A represents the traditional double-J tube, B represents the double-J tube with sutures, C represents the magnetic absorption type double-J tube, and D represents the double-J tube incorporating the present utility model. As Figure 4 shown, it is a schematic connection diagram of the present utility model and the double-J tube.

[0034] The present utility model is an improvement of the ureteral stent with sutures. While retaining the advantage of convenient removal of the ureteral stent, it avoids the defects of the existing stent with sutures, such as high urinary tract infection rate, easy prolapse during long-term indwelling, and lower urinary tract symptoms (urethral discomfort, stabbing pain, urgency) caused by suture irritation.

[0035] Compared with the currently commonly used method of removing the ureteral stent by cystoscope, this device avoids invasive operations, reduces medical costs, avoids iatrogenic injuries, and for patients who need anesthesia, it also avoids secondary anesthesia. Compared with the ureteral stent with sutures, this method is convenient for long-term indwelling, reduces the risk of urinary tract infection, and reduces the lower urinary tract symptoms caused by sutures.

[0036] The above-described embodiments have elaborated in detail the technical solutions and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modification, supplement, and equivalent replacement made within the principle scope of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An auxiliary device for the bladder end of a ureteral stent, characterized in that, It includes a metal ball (1) and a hollow tubular channel (2), and the metal ball (1) is provided with a through hole matching the outer diameter of the hollow tubular channel (2); The front end of the hollow tubular channel (2) extends into the through hole from the tail end of the metal ball (1) and is fixed to the tail end of the metal ball (1) through a degradable fixing layer (3), and the rear end of the hollow tubular channel (2) is used for connecting a ureteral stent; The outer wall of the hollow tubular channel (2) is wound with a non-absorbable suture (4), the front end of the non-absorbable suture (4) passes through the degradable fixing layer (3) and then is connected to the tail end of the metal ball (1), and the rear end of the non-absorbable suture (4) is used for connecting a ureteral stent.

2. The auxiliary device for the bladder end of the ureteral stent according to claim 1, wherein, The outer diameter of the metal ball is 3-5 mm, and the diameter of the through hole of the metal ball is 0.9-1.1 mm.

3. The auxiliary device for the bladder end of the ureteral stent according to claim 1, characterized in that, The material of the metal ball is brass or 304 stainless steel.

4. The auxiliary device for the bladder end of the ureteral stent according to claim 1, characterized in that The material of the degradable fixing layer (3) is a porous silicon-based material.

5. The auxiliary device for the bladder end of the ureteral stent according to claim 1, wherein, The total length of the non-absorbable suture (4) is 30-60 cm, and it is evenly wound on the outer wall of the hollow tubular channel (2), and the winding distance is 0.8-1.5 cm.

6. The auxiliary device for the bladder end of the ureteral stent according to claim 1, wherein The non-absorbable suture (4) adopts a Prolene suture.

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