A ureteral stent capable of controlling discharge time and removing without surgery

Abstract

The present invention discloses a ureteral stent capable of controlling discharge time and removing without surgery, comprising a ureteral stent, a silk thread and a discharge body, wherein the two ends of the silk thread are respectively connected to the ureteral stent and the discharge body, and further comprising a degradable thread, wherein the degradable thread binds the discharge body to the ureteral stent or the silk thread and is arranged near the connection between the ureteral stent and the silk thread, wherein the discharge body is a magnetic part, and further comprising an external magnetic attraction part, wherein the external magnetic attraction part comprises a permanent magnet block and an iron plate, wherein one side of the permanent magnet block is connected to the iron plate and the other side is provided with an inner concave portion. The present invention can utilize a degradable thread that automatically dissolves after a certain period of time, thereby meeting the controllability requirements of the discharge of the ureteral stent, and can utilize magnetic force to break the degradable thread when the degradable thread is not degraded, thereby releasing the discharge body in advance.

Description

Technical Field

[0001] The invention relates to the technical field of ureteral stents, in particular to the technical field of a ureteral stent capable of controlling discharge time and removing without surgery. Background Art

[0002] The ureter is connected to the renal pelvis above and the bladder below. It is a pair of thin and long tubes in the shape of a flat cylinder, with an average diameter of 0.5 to 0.7 cm and a total length of 25 to 35 cm (for adults). It is located behind the peritoneum and vertically descends along the front of the inner side of the psoas major muscle into the pelvis. Ureteral stents have the advantages of relieving ureteral obstruction, dilating ureters, preventing ureteral stenosis, facilitating the discharge of stones, and promoting postoperative recovery of ureters, so they are widely used in hospitals.

[0003] With the widespread development of minimally invasive surgeries such as ureteroscopy, rigid ureteroscopy, percutaneous nephrolithotomy, laparoscopy, and robotic laparoscopy in urology, patients' postoperative recovery speed is getting faster and faster, so patients' requirements are getting higher and higher. However, the existing double J tube must be removed through a secondary cystoscopic operation after placement, which greatly increases the pain of postoperative patients, especially for male patients, and also increases the patient's medical expenses. In order to solve the above technical problems, the industry has studied absorbable stents and extracorporeal wire retention methods, but the effect is not ideal. The Chinese patent "A new type of ureteral stent that is easy to remove without surgery" with patent number ZL201921377413.6 solves the technical problem that the ureteral stent in the prior art must be removed through cystoscopic surgery and cannot be discharged by itself by combining wires and balls. However, since the time for the discharge of the small balls during urination is not controllable and the discharge time is short, it is only suitable for patients with a short time of double J tube placement. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a ureteral stent with controllable excretion time and no surgical removal, which can utilize a degradable thread that automatically dissolves after a certain period of time, thereby meeting the controllability requirements of the ureteral stent excretion.

[0005] To achieve the above-mentioned purpose, the present invention proposes a ureteral stent with controllable excretion time and non-surgical removal, comprising a ureteral stent, a silk thread and an excretion body, wherein the two ends of the silk thread are respectively connected to the ureteral stent and the excretion body, and also comprises a degradable thread, wherein the degradable thread binds the excretion body to the ureteral stent or the silk thread and is arranged near the connection between the ureteral stent and the silk thread.

[0006] Preferably, the ureteral stent comprises a stent body and a forward J-shaped tube, the stent body is tubular and the left and right ends are respectively connected to the silk thread and the forward J-shaped tube.

[0007] Preferably, a bell-mouth tube or a reverse J-shaped tube is provided at one end of the bracket body away from the forward J-shaped tube, and the wire is connected to the bell-mouth tube or the reverse J-shaped tube.

[0008] Preferably, the stent body, the forward J-shaped tube and the reverse J-shaped tube are all provided with a plurality of drainage holes.

[0009] Preferably, the length of the silk thread is greater than the length of the human urethra.

[0010] Preferably, the degradable thread is made of one of L-lactide / ε-caprolactone copolymer and glycolide / ε-caprolactone copolymer or a mixture of the two materials.

[0011] Preferably, the length of the degradable thread is 2 to 3 cm, and the thickness is 5 mm, which is about the thickness of a hair.

[0012] Preferably, the surface of the discharge body is smooth and provided with through holes, and the silk thread and the degradable thread are passed through the through holes to bind the discharge body, and the aperture size of the through holes is large enough for loach guide wire or zebra guide wire to pass through.

[0013] Preferably, the discharge body is a magnetic member, and further comprises an external magnetic attraction member, wherein the external magnetic attraction member comprises a permanent magnet block and an iron plate, wherein one side of the permanent magnet block is connected to the iron plate and the other side is provided with an inner recess.

[0014] Preferably, the discharge body is a non-magnetic member.

[0015] Beneficial effects of the present invention:

[0016] 1) By setting a degradable thread to tie the excretion body, the excretion body can be limited to the vicinity of the connection between the ureteral stent and the silk thread when it is not dissolved, so as to prevent the excretion body from being discharged prematurely due to the action of gravity and urine impact force. It can also automatically dissolve after a certain period of time, canceling the position limit of the excretion body, so that medical staff or patients can use the excretion body discharged from the body along with urine and the silk thread to remove the entire ureteral stent. The overall structure is simple, the cost is low, the operation is convenient, and the pain and economic burden brought to the patient by a second cystoscopic surgery are effectively avoided;

[0017] 2) Physicians can select degradable threads of different materials according to their needs and control the degradation time of the degradable threads, thereby meeting the controllability requirements for ureteral stent excretion;

[0018] 3) The length of the degradable thread is 2-3cm, the thickness is 50, which is about the thickness of a hair. The degradation products produced in the bladder are very few and can be easily excreted with urine, without causing any major discomfort to the human body;

[0019] 4) By using a magnetic part as the discharge body and cooperating with the magnetic adsorption of the external magnetic suction part, the degradable line can be broken by magnetic force when the degradable line is not degraded, thereby further improving the controllability of the ureteral stent discharge.

[0020] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of the first embodiment when the degradable thread is not degraded;

[0022] Figure 2 is a front view of the first embodiment when the degradable thread has been degraded;

[0023] Figure 3 is a front view of the second embodiment when the degradable thread has been degraded;

[0024] Figure 4 is a front view of Example 3 when the degradable thread has been degraded;

[0025] Figure 5 is a diagram of the use state of the third embodiment when the discharge body is not discharged from the human body;

[0026] Figure 6 is a diagram of the use state of the third embodiment when the discharge body has been discharged from the human body;

[0027] Figure 7 It is a front view of an external magnetic attraction part of a ureteral stent of the present invention, which can control the discharge time and can be removed without surgery.

[0028] In the figure: 1-ureteral stent, 11-stent body, 12-forward J-tube, 13-trumpet tube, 14-reverse J-tube, 15-drainage hole, 2-silk thread, 3-discharge body, 4-degradable thread, 5-external magnetic attraction part, 51-permanent magnet block, 511-inner recess, 52-iron plate, 6-ureter. DETAILED DESCRIPTION

[0029] Embodiment 1:

[0030] See also Figure 1 , Figure 2 and Figure 7The present invention discloses a ureteral stent that can control the discharge time and can be removed without surgery, comprising a ureteral stent 1, a silk thread 2 and a discharge body 3, wherein the two ends of the silk thread 2 are respectively connected to the ureteral stent 1 and the discharge body 3, and further comprising a degradable thread 4, wherein the degradable thread 4 binds the discharge body 3 to the ureteral stent 1 or the silk thread 2 and is arranged near the connection between the ureteral stent 1 and the silk thread 2. Among them, the degradable thread 4 can prevent the discharge body 3 from being discharged from the body prematurely due to the impact of gravity and urine during urination when it is not degraded. When the degradable thread 4 is degraded, the discharge body 3 will be automatically discharged from the body under the impact of gravity and urine. At this time, medical staff or patients can directly pull the ureteral stent 1 connected to the silk thread 2 out of the body by pulling the discharge body 3, thereby avoiding secondary cystoscopic surgery.

[0031] The ureteral stent 1 comprises a stent body 11 and a forward J-shaped tube 12. The stent body 11 is tubular and its left and right ends are respectively connected to the silk thread 2 and the forward J-shaped tube 12. This structure is suitable for placing the forward J-shaped tube 12 from top to bottom during percutaneous nephroscopic surgery.

[0032] The stent body 11 and the forward J-shaped tube 12 are both provided with a plurality of drainage holes 15. The drainage holes 15 can effectively improve the drainage and dredging effect of the ureteral stent 1.

[0033] The length of the thread 2 is greater than the length of the human urethra, thereby meeting the requirement of expelling the discharge body 3 from the body.

[0034] The degradable thread 4 is prepared from a material with a slower degradation rate (L-lactide / ε-caprolactone copolymer) or a material with a faster degradation rate (glycolide / ε-caprolactone copolymer). In addition, the degradable thread 4 can also be prepared by mixing the above two materials, or by using other degradable materials. Among them, the physician can select a degradable thread 4 with a suitable degradation time according to the needs, so that the ureteral stent 1 can be removed according to the physician's approximately predetermined time, thereby improving the controllability of the operation.

[0035] The length of the degradable thread 4 is 2 to 3 cm, and the thickness is 50, which is about the thickness of a hair. The degradation products produced in the bladder are very few and can be easily discharged with urine without causing great discomfort to the human body.

[0036] The surface of the discharge body 3 is smooth and is provided with a through hole. The silk thread 2 and the degradable thread 4 are passed through the through hole to tie the discharge body 3. The aperture size of the through hole can be passed through by a loach guide wire (model 038 / 150) or a zebra guide wire. Among them, the discharge body 3 can be in a variety of shapes, preferably a spherical shape without obvious foreign body sensation in the body. In addition, the through hole can not only realize the binding connection between the discharge body 3 and the silk thread 2 and the degradable thread 4, but also enable the discharge body 3 to pass through the guide wire together with the ureteral stent 1, the silk thread 2 and the degradable thread 4 during the operation and be pushed by the push rod to be placed in the renal pelvis, ureter 6 and bladder, thereby effectively improving the convenience of operation.

[0037] The discharge body 3 is a magnetic part, and also includes an external magnetic attraction part 5, the external magnetic attraction part 5 includes a permanent magnet block 51 and an iron plate 52, one side of the permanent magnet block 51 is connected to the iron plate 52 and the other side is provided with an inner concave part 511. When the ureteral stent 1 needs to be removed, the external magnetic attraction part 5 can be placed on the outer side of the skin of the perineum or pubic bone, and mutually attract the discharge body 3 through human tissue, and the discharge body 3 is released from the degradable line 4 in advance during the movement, thereby further improving the controllability of the operation. Among them, the iron plate 52 can not only weaken the magnetic attraction force on the back side of the permanent magnet block 51 (i.e., the side close to the iron plate 52), but also enhance the magnetic attraction force on the front side of the permanent magnet block 51 (i.e., the side away from the iron plate 52). The inner concave part 511 is a concave structure of an arc surface or a hemispherical surface. The inner concave part 511 can make the magnetic lines of force more concentrated, so that the magnetic force can be attracted farther, thereby realizing the long-distance adsorption of the discharge body 3.

[0038] Secondly, if the degradable thread 4 can be fully degraded precisely according to the predetermined time, or the operation does not require a high time for removing the ureteral stent, a non-magnetic member can be used as the discharge body 3. The material of the discharge body 3 can be metal, glass or other materials, with a density heavier than that of water, and is preferably austenitic stainless steel (304 stainless steel) that has less impact on the human body.

[0039] Embodiment 2:

[0040] See also Figure 3 The end of the stent body 11 away from the forward J-shaped tube 12 is provided with a bell-mouthed tube 13, and the silk thread 2 is connected to the bell-mouthed tube 13. The bell-mouthed tube 13 can be fixed at the bladder and reduce the stimulation to the bladder wall, avoiding the patient from urinating frequently, urgently and hematuria, and at the same time preventing the lower end of the stent body 11 from retracting upward due to reflux peristalsis of the ureter 6 or bladder contraction.

[0041] The rest is the same as in the first embodiment.

[0042] Embodiment three:

[0043] See also Figure 4The end of the stent body 11 away from the forward J-tube 12 is provided with a reverse J-tube 14, and the silk thread 2 is connected to the reverse J-tube 14. The reverse J-tube 14 can be fixed at the bladder, and at the same time prevent the lower end of the stent body 11 from retracting upward due to reflux peristalsis of the ureter 6 or bladder contraction.

[0044] The reverse J-shaped tube 14 is also provided with a plurality of drainage holes 15 .

[0045] The rest is the same as in the first embodiment.

[0046] See also Figure 5 During the installation process, the guide wire is first placed into the ureter 6. Then, the silk thread 2 is passed through the through hole and tied to the excretion body 3, and then the excretion body 3 is tied to the end of the reverse J-tube 14 or the silk thread 2 near the end using the degradable thread 4. Subsequently, the ureteral stent 1 and the excretion body 3 are simultaneously passed through the outside of the guide wire, and then slowly pushed along the guide wire, so that the forward J-tube 12 is placed at the patient's renal pelvis, the end of the stent body 11 is placed at the patient's bladder opening, and the reverse J-tube 14, the silk thread 2, the excretion body 3 and the degradable thread 4 are placed inside the bladder.

[0047] See also Figure 5 and Figure 6 During use, the undegraded degradable thread 4 can prevent the excretion body 3 from being discharged from the body prematurely due to the impact of gravity and urine during urination. When the degradable thread 4 is degraded, the excretion body 3 will be discharged from the body under the impact of gravity and urine. At this time, medical staff or patients can pull the excretion body 3 directly out of the body to pull the ureteral stent 1 connected to the silk thread 2, avoiding secondary cystoscopic surgery. If the degradable thread 4 is not fully degraded according to the predetermined time, the external magnetic suction part 5 can be placed on the outside of the skin of the perineum or pubic bone, and the excretion body 3 is attracted to each other through the human tissue, so that the excretion body 3 is released from the degradable thread 4 in advance during the movement.

[0048] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A ureteral stent capable of controlling discharge time and removing without surgery, comprising a ureteral stent (1), a silk thread (2) and a discharge body (3), wherein two ends of the silk thread (2) are respectively connected to the ureteral stent (1) and the discharge body (3), Features: It also includes a degradable thread (4), which binds the excretion body (3) to the ureteral stent (1) or the silk thread (2) and is arranged near the connection between the ureteral stent (1) and the silk thread (2), and the degradable thread (4) is made of one material or a mixture of the two materials of L-lactide / ε-caprolactone copolymer and glycolide / ε-caprolactone copolymer. The surface of the excretion body (3) is smooth and is provided with a through hole. The silk thread (2) and the degradable thread (4) both pass through the through hole to bind the excretion body (3), and the aperture of the through hole is The size is such that a loach guide wire or a zebra guide wire can pass through it. The discharge body (3) is a magnetic component and further comprises an external magnetic attraction component (5). The external magnetic attraction component (5) comprises a permanent magnet block (51) and an iron plate (52). One side of the permanent magnet block (51) is connected to the iron plate (52) and the other side is provided with an inner recess (511). By adopting the magnetic component as the discharge body (3) and cooperating with the magnetic attraction of the external magnetic attraction component (5), the degradable thread (4) can be broken by magnetic force when the degradable thread (4) is not degraded. The length of the silk thread (2) is greater than the length of the human urethra.

2. A ureteral stent capable of controlling discharge time and removing without surgery as claimed in claim 1, Features: The ureteral stent (1) comprises a stent body (11) and a forward J-shaped tube (12); the stent body (11) is tubular and its left and right ends are respectively connected to the silk thread (2) and the forward J-shaped tube (12).

3. A ureteral stent capable of controlling discharge time and removing without surgery as claimed in claim 2, Features: A bell-mouth tube (13) or a reverse J-shaped tube (14) is provided at one end of the support body (11) away from the forward J-shaped tube (12), and the wire (2) is connected to the bell-mouth tube (13) or the reverse J-shaped tube (14).

4. A ureteral stent capable of controlling discharge time and removing without surgery as claimed in claim 3, Features: A plurality of drainage holes (15) are provided on the support body (11), the forward J-shaped tube (12) and the reverse J-shaped tube (14).

5. A ureteral stent capable of controlling discharge time and removing without surgery as claimed in claim 1, Features: The length of the degradable thread (4) is 2 to 3 cm and the thickness is 5 mm.

Images