Ureteral stent

Abstract

The utility model provides a ureter support, which relates to the technical field of medical instruments and comprises a tube body, a plurality of drainage holes and a cavity channel for flow guide liquid to pass through are arranged on the tube body, a fixing wire is further arranged on the tube body, the fixing wire is arranged along the axial direction of the tube body, the hardness of the fixing wire is higher than that of the tube body, and the tube body can be shaped by the fixing wire. By arranging the fixing wire, under the condition that the flexibility of the pipe is guaranteed, the fixing strength is improved, the comfort degree of a patient is improved, meanwhile, the stent disengagement risk is reduced, pre-shaping can be conducted before the stent is placed in the body of the patient, the stent is made to be more attached to the physiological structure of the patient, friction between the pelvis and the ureter and the stent in the moving process of the patient is reduced, and the patient is protected. And discomfort and inflammation caused by stent implantation are reduced. Compared with a traditional structure, the auxiliary fixing part is additionally arranged at the tail end of the support, the fixing area is increased through the auxiliary fixing part, fixing devices such as adhesive tape and gauze are matched, and the risk of support slipping caused by in-vitro fixing failure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a ureteral stent. Background Art

[0002] The ureteral stent plays an important role in the treatment of ureteral stenosis. It can support the stenotic urethra and ensure unobstructed urine flow, thereby alleviating the impact of ureteral stenosis on renal function. At the same time, the indwelling of the stent tube can also dilate the ureter and facilitate the discharge of crushed stones after kidney stone surgery.

[0003] The traditional design of the ureteral stent is basically a hollow catheter with multiple side holes, and the material is mainly polyurethane and other materials. Generally, one end or both ends are shaped and bent to limit its movement in the body. One end is fixed in the renal pelvis, and because it resembles a pig's tail, it is also called a pig's tail tube or a double-J tube.

[0004] Since this design only relies on the pig's tail shaped by the tube body itself to be stuck at the opening of the renal pelvis and the ureter to provide the fixing strength, a high fixing strength requires a high hardness of the tube body and good anti-deformation ability. This design can reduce the risk of slippage, but the corresponding comfort of the patient after the stent catheter is implanted is poor and it is easy to cause inflammation; the stent with a low tube body hardness has a relatively poor anti-deformation ability, and the risk of slippage after the stent is implanted becomes larger. After slippage, the product loses its function, and the patient may have the pain of a second operation. Moreover, the traditional design only relies on the fixing force of the stent at the ureteral opening, and the tissue compression force at this place is relatively large, and the proportion of patients with discomfort caused by this compression is relatively high.

[0005] In addition, for patients with bladder resection, etc., a single pig's tail stent needs to be used. The end of the stent is connected to the outside of the body with a silk thread, and the silk thread is fixed to the patient's body with tape, etc., and it is easy to fall off or be pulled out with the normal activities of the patient, thereby causing the stent to slip.

[0006] In view of the above defects, this application is proposed. Content of the Utility Model

[0007] The purpose of the utility model is to provide a ureteral stent to solve the problem that it is difficult to balance the tube body hardness and the fixing strength of the ureteral stent in the prior art.

[0008] The utility model provides a ureteral stent, which includes a tube body. A plurality of drainage holes and a cavity for guiding liquid to pass through are arranged on the tube body. A fixing wire is also arranged on the tube body. The fixing wire is arranged along the axial direction of the tube body. The hardness of the fixing wire is higher than that of the tube body. The tube body can be shaped by the fixing wire, so that the hardness of the tube body of the ureteral stent and the fixing strength are balanced through the arrangement of the fixing wire, and the comfort of the patient is ensured.

[0009] According to an embodiment of the present utility model, a silk thread is connected to the end of the tube body for extending the stent into the bladder or outside the body, and the silk thread is used to remove the stent through the silk thread after the ureteral stent indwelling is completed.

[0010] According to an embodiment of the present utility model, the silk thread is connected to an auxiliary fixing member, and the auxiliary fixing member is used to fix on the patient's body to provide a fixing force. The auxiliary fixing device is made of a lightweight material, has a certain volume, and can have a large fixing area. In clinical practice, materials such as tapes and gauzes are used to fix on the patient's body to provide a good fixing force and are not easily displaced to cause the stent to prolapse, solving the problem that the current external silk thread fixation is prone to cause the stent to slip off.

[0011] According to an embodiment of the present utility model, one end or both ends of the tube body are provided with pig-tail segments.

[0012] According to an embodiment of the present utility model, the cross-sectional shape of the fixing wire is one of a circle or a square, but is not limited to the above shapes.

[0013] According to an embodiment of the present utility model, the fixing wire is embedded in the tube body.

[0014] According to an embodiment of the present utility model, one or several fixing wires are provided.

[0015] According to an embodiment of the present utility model, the fixing wire is made of a metal material or a polymer material, or a combination of a metal material and a polymer material can also be used.

[0016] According to an embodiment of the present utility model, the fixing wire is made of a shape memory metal material, such as a metal such as nitinol.

[0017] The beneficial effects of the present utility model are as follows: By providing the fixing wire, while ensuring the softness of the pipe material, the fixing strength is improved, the comfort of the patient is improved, the risk of stent prolapse is reduced, and pre-shaping can be performed before being implanted into the patient's body to make it more conform to the patient's physiological structure, reducing the friction between the renal pelvis, ureter and the stent during the patient's movement, and reducing the discomfort and inflammation caused by the stent implantation. The end of the stent has an additional auxiliary fixing member compared with the traditional structure. The auxiliary fixing member increases the fixing area, and cooperates with fixing devices such as tapes and gauzes to reduce the risk of stent slippage caused by the failure of external fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of the ureteral stent;

[0020] Figure 2 It is a schematic diagram of the position of the fixing wire and the tube body;

[0021] Figure 3 Cross-sectional view of the pipe body with a circular cross-section of the fixing wire

[0022] Figure 4 Cross-sectional view of the pipe body with a square cross-section of the fixing wire Specific implementation mode

[0023] The following description is only used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and other obvious variations can be thought of by those skilled in the art. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other schemes that do not depart from the spirit and scope of the present invention.

[0024]

Embodiment 1

[0025] A ureteral stent. The ureteral stent in this embodiment can be a single pigtail or double pigtail structure, such as Figure 1 , including a pipe body 1. The pipe body 1 generally includes a pigtail section and a straight section. The pipe body can be made of other soft and skin-friendly materials such as polyurethane and silica gel. A cavity for guiding and draining liquid to the bladder is provided in the pipe body 1. A plurality of radially penetrating drainage holes 1-1 are provided on the outer wall of the pipe body 1 for draining liquid into the cavity of the pipe body.

[0026] A fixing wire 1-2 is provided on the pipe body 1. In this embodiment, the fixing wire 1-2 is arranged inside the wall body of the pipe body 1 and the fixing wire 1-2 is not exposed. In other embodiments, this arrangement is not limited, and the fixing wire 1-2 can also be embedded in a groove on the outer wall or the inner wall of the cavity of the pipe body 1.

[0027] The fixing wire 1-2 is arranged entirely or partially or in sections along the axial direction of the pipe body 1. In this embodiment, such as Figure 2 , the fixing wire 1-2 is not provided at the end of the pigtail section. The hardness of the fixing wire 1-2 is higher than that of the pipe body 1. The fixing wire 1-2 can be made of a metal material or a polymer material, but is not limited to the above two materials. In this embodiment, preferably, the fixing wire 1-2 is made of a shape memory metal material such as nitinol alloy, etc., and the pipe body 1 can be shaped by the fixing wire.

[0028] One or several fixing wires 1-2 can be provided, and can be arranged in a straight line or a curve, such as Figure 3 , Figure 4 , and its cross-section is circular or square, but is not limited to these two shapes.

[0029] Furthermore, the tube body 1 is connected to the auxiliary fixing member 3. The auxiliary fixing member 3 is used to be fixed on the patient to provide a fixing force. In this embodiment, the tube body 1 and the auxiliary fixing member 3 are connected by a silk thread 2. The silk thread 2 is connected to the end of the tube body and is used to extend the stent into the bladder or outside the body. After the indwelling is completed, it is taken out through the silk thread 2. In the traditional method, only using tape to fix the silk thread on the patient is likely to fall off or be pulled out with the normal activities of the patient, which may lead to the slippage of the stent. In this solution, the auxiliary fixing member 3 is added. The auxiliary fixing member 3 has a certain volume, generally set as a sheet shape, and can be made of hollow metal material or lightweight polymer material, which is used to increase the fixable area. In clinical practice, tape, gauze and other materials are used to fix it on the patient to provide good fixing force and are not easy to move and cause the stent to come out.

[0030] Compared with the traditional structure, the fixing wire can improve the anti-deformation ability of the pipe while maintaining the softness of the pipe, reducing the discomfort of the patient. Moreover, before the operation, according to the state of the patient's renal pelvis and ureter, the stent can be pre-shaped by the fixing wire to make it more conform to the patient's physiological structure, further improving the patient's comfort.

[0031] An auxiliary fixing member is added to the tail end of the stent compared with the traditional structure. The auxiliary fixing member increases the fixable area and cooperates with fixing devices such as tape and gauze to reduce the risk of stent slippage caused by the failure of external fixation.

[0032] After the stent is placed in the patient's body, the auxiliary fixing member 3 extends to the outside of the body along the silk thread. The auxiliary fixing member 3 is light in weight, has a certain volume and a large fixable area. In clinical practice, tape, gauze and other materials are used to fix it on the patient to provide good fixing force and are not easy to move and cause the stent to come out.

[0033] The fixing wire can shape the tube body of the stent, making the pig-tail section of the tube body not easy to deform. At the same time, it is not necessary for the tube body material itself to provide a large fixing strength, so that the tube body can be made of a softer material, improving the patient's comfort while reducing the risk of stent prolapse. The stent with a fixing wire can be pre-shaped before being placed in the patient's body to make it more conform to the patient's physiological structure, reducing the friction between the renal pelvis, ureter and the stent during the patient's activities, and reducing the discomfort and inflammation caused by stent placement.

[0034] Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and explained in the embodiments. Without departing from the above principle, the embodiments of the present invention can have any deformation and modification.

Claims

1. A ureteral stent, characterized in that: It includes a tube body (1), on which a drainage hole (1-1) and a cavity for guiding liquid to pass through are provided. A fixing wire (1-2) is also provided on the tube body (1). The fixing wire (1-2) is arranged along the axial direction of the tube body (1). The hardness of the fixing wire (1-2) is higher than that of the tube body (1), and the tube body (1) can be shaped by the fixing wire (1-2).

2. The ureteral stent according to claim 1, wherein: The tube body (1) is connected with a silk thread (2), and the silk thread (2) is used to be taken out through the silk thread (2) after the ureteral stent indwelling is completed.

3. The ureteral stent according to claim 2, wherein: The silk thread (2) is connected with an auxiliary fixing member (3), and the auxiliary fixing member (3) is used to provide a fixing force by being fixed on the patient.

4. The ureteral stent according to any one of claims 1-3, characterized in that: One end or both ends of the tube body (1) are provided with pig-tail segments.

5. The ureteral stent according to any one of claims 1-3, characterized in that: The cross-sectional shape of the fixing wire (1-2) is circular or square.

6. The ureteral stent according to any one of claims 1-3, characterized in that: The fixing wire (1-2) is embedded in the tube body (1).

7. The ureteral stent according to any one of claims 1-3, characterized in that: The material of the tube body (1) is polyurethane or silica gel.

8. The ureteral stent according to any one of claims 1-3, characterized in that: One or several fixing wires (1-2) are provided.

9. The ureteral stent according to any one of claims 1-3, characterized in that: The fixing wire (1-2) is made of a metal material or a polymer material.

10. The ureteral stent according to any one of claims 1-3, characterized in that: The fixing wire (1-2) is made of a shape memory metal material.

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