Ureteral stent removing device

Abstract

The invention discloses a ureteral stent removing device which comprises a handle, a sheathing canal, a magnet and a sliding part. The handle is hollow; one end of the sheathing canal is contained in the handle and is flush with the handle, the other end of the sheathing canal extends out of the handle, and the sheathing canal is provided with a through channel in the axial direction; the magnet is arranged at the end, away from the handle, of the sheathing canal, and a through hole is formed in the axial direction of the sheathing canal and communicated with the channel. The sliding piece penetrates through the channel and the through hole, and the length of the sliding piece is larger than the sum of the length of the channel and the thickness of the magnet. The channel and the sliding piece are arranged, whether the magnet attracts the ureteral stent or not is judged according to the position change of the sliding piece, the cross infection risk caused by the fact that a reusable instrument is used in the ureteral stent taking-out operation is avoided, and the pain of a patient in the ureteral stent taking-out operation is reduced or even eliminated; the problems that department mirror using and operating room tension caused by a traditional operation mode are solved, and the problem that instruments need to be inserted into the urethra for multiple times in a magnetic attraction support pulling-out mode is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a ureteral stent removal device. Background Art

[0002] Urinary stones are a common urinary system disease. Ureteral stents are usually left in place after lithotripsy to discharge the stones and prevent postoperative ureteral stenosis. The stents need to be removed after a period of time. The traditional removal method is to use foreign body forceps to clamp and remove them under a cystoscope or nephroscope. This method has the following disadvantages: 1. All surgical instruments are reused, and there is a risk of cross-infection; 2. Although the ureteral stent can be successfully removed under cystoscopy, the method is relatively rough, and patients often need to endure the pain of mild urethral tearing due to the large size of the cystoscope, and the hard endoscope is very painful when passing through the curved section of the male urethra; 3. The surgical method causes a shortage of endoscopes in the department and occupies the resources of the department's operating room.

[0003] For many years, cystoscopic-free removal of ureteral stents has been the pursuit of urologists. At present, there are three mainstream research directions for cystoscopic-free removal of ureteral stents: 1. Degradable ureteral stents; degradable ureteral stents are degraded by human urine, and no subsequent stent removal is required, which is a very ideal concept. At present, due to the problem of insufficient degradation leading to blockage of ureters or urethra by degraded fragments, the product is still in the research stage and has not yet been used clinically. 2. Ureteral stent with wires; after insertion, the ureteral stent with wires is left outside the body along the urethra, and after a period of time, it is directly removed outside the body. However, this method will cause the stent tube to fall off or shift prematurely, continuous urine leakage, urinary tract infection, affect sexual life and daily activities, so it has not been widely used. 3. Magnetic ureteral stent kit; The magnetic ureteral stent kit includes a ureteral stent with a magnet or a soft magnet and a removal device with a magnet at the distal end. When removing, it relies on the principle of attraction between opposite magnetic poles to achieve blind removal without cystoscopic removal. This method can achieve cystoscopic-free stent removal to a certain extent, but the attraction between the magnet on the removal device and the magnet on the ureteral stent in the bladder is a blind operation, and it is difficult to judge whether the two magnets are successfully attracted. This makes it difficult to remove the stent in one go through a blind operation, so repeated insertion into the urethra may be required, which greatly aggravates the damage to the urethra.

[0004] In summary, a stent removal method that can achieve ureteral stent removal without cystoscopy and does not require multiple insertions into the urethra for operation can solve the problems faced by urologists using traditional stent removal. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a ureteral stent removal device, which is equipped with a liquid channel visible to the naked eye to observe whether the magnetic attraction is successful, thereby avoiding the above-mentioned defects.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a ureteral stent removal device, the ureteral stent removal device comprising a handle, a sheath, a magnet and a sliding member; The handle is hollow inside; One end of the sheath tube is accommodated in the handle and is flush with the handle, and the other end extends out of the handle. The sheath tube is provided with a penetrating channel along the axial direction; The magnet is arranged on one end of the sheath tube away from the handle, and a through hole is opened along the axial direction of the sheath tube, and the through hole is communicated with the channel; The sliding member is inserted into the channel and the through hole, and the length of the sliding member is greater than the sum of the length of the channel and the thickness of the magnet.

[0007] The through hole has the same diameter as the channel, and the channel has a diameter greater than a diameter of the sliding member.

[0008] The length of the slider is greater than the sum of the length of the channel and the thickness of the magnet by 2 mm.

[0009] The sliding member is a guide wire formed of polytetrafluoroethylene.

[0010] The sheath tube includes a mounting section, a urethra section and a bladder section along the axial direction. The mounting section is accommodated in the handle, and the urethra section and the bladder section are located outside the handle. An angle is formed between the bladder section and the urethra section.

[0011] Wherein, the length of the urethra section is not less than 24 cm, and the length of the bladder section is not more than 10 cm.

[0012] Wherein, the included angle between the bladder segment and the urethra segment is any value between 120 degrees and 150 degrees.

[0013] Wherein, the urethra segment is also provided with scale marks.

[0014] Wherein, the outer wall of the mounting section is bonded to the inner wall of the handle.

[0015] The thickness of the magnet is any value between 2 cm and 5 cm, the diameter is equal to the diameter of the sheath tube, and the through hole is opened at the center of the magnet.

[0016] Compared with the prior art, the beneficial effects achieved by the ureteral stent removal device of the present invention are: by setting a channel and a sliding part, judging whether the magnet is attracted to the ureteral stent according to the position change of the sliding part, the risk of cross infection caused by the use of reused instruments in ureteral stent removal surgery is solved, the pain of patients during ureteral stent removal surgery is reduced or even eliminated, the problem of tight departmental mirror use and operating room caused by traditional surgical methods is solved, and the problem of the need to insert the instrument into the urethra multiple times in the magnetic suction stent removal method is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of a ureteral stent removal device of the present invention; Figure 2 is a cross-sectional schematic diagram of a ureteral stent removal device of the present invention; Figure 3 This is a schematic diagram of the removal device and ureteral stent before magnetic attraction; Figure 4 This is a schematic diagram of the removal device and the ureteral stent after magnetic attraction; Figure 5 yes Figure 4 A partial enlarged view of part A in the middle. Implementation

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] See also Figures 1 to 5 , Figure 1 It is a structural schematic diagram of the ureteral stent removal device of the present invention, which includes a handle 1, a sheath 2, a magnet 3 and a sliding member 4, wherein the handle 1 is used for holding when removing the ureteral stent, the sheath 2 is used for inserting into the bladder and urethra, the magnet 3 is used for magnetic attraction with the ureteral stent, so as to pull the ureteral stent out of the bladder, and in order to cooperate with the magnet 3, a component with a magnet or a soft magnet is provided on the ureteral stent. The sliding member 4 is used to indicate whether the magnet 3 has completed the magnetic attraction with the ureteral stent.

[0023] For ease of understanding, in this application, the end of the ureteral stent removal device that is close to the operator during use is called the proximal end, and the end that is away from the operator and close to the patient is called the distal end. Since the handle 1 is the operating end during use of the ureteral stent removal device and is close to the operator, it is located at the proximal end relative to the sheath 2 and the magnet 3. Since the magnet 3 is away from the operator and close to the lesion, it is located at the distal end relative to the handle 1.

[0024] The handle 1 is hollow inside, the proximal end of the sheath 2 is accommodated in the handle 1 and flush with the proximal end of the handle 1, and the other end, i.e., the distal end, extends out from the handle 1, and the sheath 2 is provided with a through channel 21 along the axial direction. The magnet 3 is provided at one end of the sheath 2 away from the handle 1, i.e., the distal end of the sheath 2, and a through hole 31 is provided along the axial direction of the sheath 2, and the through hole 31 is connected with the channel 21. The sliding member 4 is penetrated in the channel 21 and the through hole 31, and can slide in the channel 21 and the through hole 31. The length of the sliding member 4 is greater than the sum of the length of the channel 21 and the thickness of the magnet 3, so that at least a section of the sliding member 4 must be exposed from the channel 21 and the through hole 31.

[0025] Through the above arrangement, before using the removal device to magnetically absorb the ureteral stent, the slider 4 is pushed so that the proximal end of the slider 4 is flush with the proximal end of the handle 1. Due to the length difference, the distal end of the slider 4 is exposed from the through hole 31 of the magnet 3. For details, please refer to Figure 3 Continue to operate the ureteral stent removal device to move it into the bladder. When the magnet 3 at the distal end is magnetically attracted to the ureteral stent, since the end face of the magnet 3 faces the ureteral stent during use, the end face of the magnet 3 is first close to and contacts the ureteral stent when the magnet 3 is magnetically attracted to the ureteral stent, thereby ensuring that the end face of the distal end of the magnet 3 is magnetically attracted to the ureteral stent. The sliding member 4 exposed from the distal end of the magnet 3 is pushed by the ureteral stent, and the distal end of the sliding member 4 is retracted into the through hole 31, and the proximal end is exposed from the handle 1. For details, please refer to Figure 4 and Figure 5 When the user visually observes the above changes, it can be determined that the removal device and the ureteral stent are successfully magnetically attracted, and the removal device can be operated to pull out the ureteral stent.

[0026] The steps for using the ureteral stent removal device of the present application are as follows: 1. After injecting an appropriate amount of local anesthetic into the urethra, push the sliding piece 4 on the removal device until it is completely retracted into the handle 1, and the other end extends out from the magnet 3, and then slowly enters the bladder along the urethra; 2. After entering the bladder, adjust the direction of the sheath tube 2 so that the magnet 3 of the sheath tube 2 faces the ureteral stent; 3. The sheath tube 2 makes a small axial movement and a small angle rotation in the bladder until the slider 4 is visually observed to pass through the proximal end of the handle 1, indicating that the magnetic attraction is successful; 4. After successful magnetic attraction, slowly withdraw the sheath 2 and remove the ureteral stent.

[0027] In order to facilitate observation of the position change of the slider 4 , a marking point may be designed at the proximal end of the slider 4 , and a visual magnification window may be provided at the proximal end of the handle 1 , so that the user can better observe the movement of the slider 4 .

[0028] In the present application, the diameters of the through hole 31 and the channel 21 are the same, and the diameters of the through hole 31 and the channel 21 are larger than the diameter of the sliding member 4. Specifically, the diameters of the through hole 31 and the channel 21 can be set to 2 mm, and the diameter of the sliding member 4 can be set to 1.8 mm, so that the sliding member 4 can slide smoothly in the through hole 31 and the channel 21.

[0029] In the present application, the length of the sliding member 4 is greater than the sum of the length of the channel 21 and the thickness of the magnet 3, which is 2 mm. If the protruding length of the sliding member 4 is too long, the ureteral stent may bend instead of being pushed toward the proximal end when the ureteral stent is magnetically attracted to the magnet 3, and the intended purpose cannot be achieved. If the protruding length of the sliding member 4 is too short, it is not conducive to user observation.

[0030] In the present application, the sliding member 4 is a guide wire formed of polytetrafluoroethylene. Polytetrafluoroethylene is a high molecular polymer obtained by polymerization of tetrafluoroethylene as a monomer, and has the characteristic of an extremely low friction coefficient, so it can slide smoothly in the channel 21.

[0031] In the present application, the sheath tube 2 includes a mounting section 22, a urethra section 23 and a bladder section 24 along the axial direction. The mounting section 22 is accommodated in the handle 1, and the two are fixedly connected. In one embodiment, the outer wall of the mounting section 22 is bonded to the inner wall of the handle 1. The urethra section 23 and the bladder section 24 are located outside the handle 1, wherein the mounting section 22 and the urethra section 23 are arranged in parallel, and an angle is formed between the bladder section 24 and the urethra section 23. Due to the complex structure in the human body, a curved bladder section 24 is provided to facilitate pushing and rotating the handle 1 to accurately adjust the position of the bladder section 24 so that it is close to the ureteral stent.

[0032] The sheath tube 2 is made of a semi-rigid material, which is convenient for passing through the male curved urethra and reducing the discomfort of the patient.

[0033] In the present application, the length of the urethra section 23 is not less than 24 cm, and the length of the bladder section 24 is not more than 10 cm. The above settings are consistent with the size and length within the normal range of the urethra and bladder, respectively, to facilitate magnetic suction operations.

[0034] In the present application, the angle between the bladder section 24 and the urethra section 23 is any value between 120 degrees and 150 degrees. Preferably, the angle between the two is 130 degrees, which is similar to the human body structure and is convenient for users to operate.

[0035] In the present application, the urethra section 23 is also provided with scale marks, for example, a scale is set every 1-2 cm, and numbers are marked at the same time, so that the user can observe the insertion depth when inserting the removal device into the bladder, so as to perform more accurate operation.

[0036] In the present application, the thickness of the magnet 3 is any value between 2 cm and 5 cm. Preferably, the thickness of the magnet 3 is 3 cm. As the thickness of the magnet 3 increases, the magnetic force also increases. The diameter of the magnet 3 is equal to the diameter of the sheath 2. The magnet 3 is covered on the distal end of the sheath 2. The through hole 31 is opened in the center of the magnet 3, so that when the magnet 3 and the ureteral stent are magnetically attracted, the through hole 31 is blocked, so that the liquid flowing in through the liquid channel 21 can completely flow out through the observation hole 22.

[0037] When using the ureteral stent removal device of the present invention, a channel and a sliding part are provided, and whether the magnet is attracted to the ureteral stent is determined according to the position change of the sliding part, thereby solving the risk of cross infection caused by the use of reused instruments in ureteral stent removal surgery, reducing or even eliminating the pain of patients during ureteral stent removal surgery, solving the problem of tight departmental mirror use and operating room tension caused by traditional surgical methods, and solving the problem of the magnetic attraction stent removal method requiring the instrument to be inserted into the urethra multiple times.

[0038] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A ureteral stent removal device, characterized in that: The ureteral stent removal device comprises a handle, a sheath, a magnet and a sliding piece; The handle is hollow inside; One end of the sheath tube is accommodated in the handle and is flush with the handle, and the other end extends out of the handle. The sheath tube is provided with a penetrating channel along the axial direction; The magnet is arranged on one end of the sheath tube away from the handle, and a through hole is opened along the axial direction of the sheath tube, and the through hole is communicated with the channel; The sliding member is inserted into the channel and the through hole, and the length of the sliding member is greater than the sum of the length of the channel and the thickness of the magnet.

2. The ureteral stent removal device according to claim 1, characterized in that: The through hole has the same diameter as the channel, and the channel has a diameter greater than a diameter of the sliding member.

3. The ureteral stent removal device according to claim 1, characterized in that: The length of the slider is greater than the sum of the length of the channel and the thickness of the magnet by 2 mm.

4. The ureteral stent removal device according to claim 1, characterized in that: The sliding member is a guide wire formed of polytetrafluoroethylene.

5. The ureteral stent removal device according to claim 1, characterized in that: The sheath tube includes a mounting section, a urethra section and a bladder section along the axial direction. The mounting section is accommodated in the handle, and the urethra section and the bladder section are located outside the handle. An angle is formed between the bladder section and the urethra section.

6. The ureteral stent removal device according to claim 5, characterized in that: The length of the urethra section is not less than 24 cm, and the length of the bladder section is not more than 10 cm.

7. The ureteral stent removal device according to claim 6, characterized in that: The angle between the bladder section and the urethra section is any value between 120 degrees and 150 degrees.

8. The ureteral stent removal device according to claim 5, characterized in that: The urethra section is also provided with scale markings.

9. The ureteral stent removal device according to claim 5, characterized in that: The outer wall of the mounting section is bonded to the inner wall of the handle.

10. The ureteral stent removal device according to any one of claims 1 to 9, characterized in that: The thickness of the magnet is any value between 2 cm and 5 cm, the diameter is equal to the diameter of the sheath tube, and the through hole is opened at the center of the magnet.

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