Degradable, drainable ureteral stent

Abstract

The present application relates to ureteral technical field, especially a kind of degradable ureteral stent of discharge.It includes stent body and the curved pigtail of being arranged at the renal pelvis end of stent body, the pigtail is provided with adhesion structure, the adhesion structure is distributed along the length direction of pigtail and is extended to stent body, adhesion structure can cover and exceed the part of pigtail and stent body inserted into the narrow position of ureter in length direction.The present application is compact, reasonable, easy to operate, all segmented fragments produced by pigtail of renal pelvis end in degradation process are adhered into one by adhesion structure, avoid the segmented fragments of pigtail of renal pelvis end fall into lower calyx, and can be discharged into bladder with ureteral stent degraded outside kidney pelvis again and then discharged from urethra, avoid the risk of secondary operation, reduce the pain caused to patient.

Description

Technical Field

[0001] This invention relates to the field of ureteral technology, and in particular to a biodegradable ureteral stent. Background Technology

[0002] In the current technology, in order to avoid the secondary surgery during the removal of traditional non-degradable ureteral stents, as well as the risk of damage to the ureter and patient suffering, there is an increasing clinical need for self-degradable and excretable ureteral stents.

[0003] However, biodegradable ureteral stents fixed within the renal pelvis use a hook structure formed by a curved pig tail loop. After degradation, the pig tail loop breaks into several pieces, losing its original hooking and fixing function. Experimental studies have shown that a significant proportion of these scattered pig tail loop fragments fall into the lower calyx of the renal pelvis and cannot be expelled. Furthermore, prolonged placement can lead to the formation of stones, requiring surgical removal. This means that even with biodegradable ureteral stents, there is still a risk of a second surgery after use, causing pain and discomfort for the patient. Summary of the Invention

[0004] This application addresses the shortcomings of existing manufacturing technologies by providing a rationally structured, biodegradable ureteral stent. Through an adhesive structure, all segmented fragments generated during the degradation of the pig tail ring are bonded together, preventing these fragments from falling into the lower calyx of the kidney. The stent can then be discharged into the bladder along with the ureteral stent that degrades outside the renal pelvis, and then excreted through the urethra. This avoids the risk of a second surgery and reduces the suffering caused to the patient.

[0005] The technical solution adopted in this invention is as follows: A biodegradable ureteral stent includes a stent body and a curved pig tail ring disposed at the renal pelvis end of the stent body. An adhesive structure is disposed on the pig tail ring, which is distributed along the length of the pig tail ring and extends to the stent body. The adhesive structure is capable of covering and extending beyond the portion of the pig tail ring and the stent body that extends into the narrow position of the ureter in the length direction.

[0006] Furthermore, both the stent body and the pig tail ring are made of biodegradable biomaterials and are integrally molded, with both being hollow round tubes.

[0007] Furthermore, the adhesion structure consists of adhesion lines that adhere to the outer surface of the pig tail pen and extend to the outer surface of the stent body. The adhesion lines are distributed in a spiral shape along the tube of the pig tail pen and the stent body.

[0008] Furthermore, the adhesion lines are distributed in a spiral or straight line along the tube of the pig tail pen and the support body.

[0009] Furthermore, the bonding structure consists of a through-line and multiple through-holes. The multiple through-holes are distributed along the length of the pig tail pen and the support body. The through-line is alternately inserted inside and outside along the multiple through-holes and bonded to the inner and outer walls of the pig tail pen and the support body.

[0010] Furthermore, the multiple perforations are distributed in a straight line or in a spiral shape.

[0011] Furthermore, the adhesive structure consists of embedded wires and grooves. The grooves are spirally distributed along the length of the pig tail ring and the support body, and the embedded wires are adhered within the grooves.

[0012] Furthermore, the adhesive structure is an adhesive tape, which is adhered to the outer surface of the pig tail pen and the support body. The adhesive tape is distributed in a spiral shape along the length of the pig tail pen and the support body.

[0013] Furthermore, the adhesive structure consists of at least one set of adhesive strips, each set of adhesive strips comprising multiple spaced adhesive strip segments. The multiple adhesive strip segments are linearly distributed along the length of the pig tail pen and the support body, and the adhesive strip segments of adjacent sets of adhesive strips are staggered along the length direction.

[0014] Furthermore, the adhesion structure is a biodegradable mesh tube. The end of the biodegradable mesh tube facing the stent body is an open end, and the end of the biodegradable mesh tube facing the pig tail pen is a closed end. The biodegradable mesh tube is adhered to the outer surface of the pig tail pen and extends all the way to the outer surface of the stent body.

[0015] The beneficial effects of this invention are as follows: This invention features a compact and rational structure, and is easy to operate. Through an adhesive structure, all segmented fragments generated during the degradation of the renal pelvis pigtail ring are bonded together, preventing these fragments from falling into the lower calyx of the kidney. These fragments can be discharged into the bladder along with the ureteral stent that degrades outside the renal pelvis, and then expelled through the urethra, avoiding the risk of secondary surgery and reducing patient suffering. The degradation and breakage time of the biodegradable adhesive structure in this invention is later than that of the matching stent body and the pigtail ring. That is, when the absorbable ureteral stent degrades and breaks, the adhesive structure has not yet broken, ensuring that the entire ureteral stent can degrade and be discharged while preventing pigtail ring fragments from falling into the lower calyx of the kidney. The non-degradable adhesive structure in this invention, if it falls into the bladder, will be discharged along with the degraded stent or will be expelled spontaneously. Attached Figure Description

[0016] Figure 1 This is a structural diagram of Embodiment 1 of the present invention.

[0017] Figure 2 This is a structural diagram of Embodiment 2 of the present invention.

[0018] Figure 3 This is a structural diagram of Embodiment 3 of the present invention.

[0019] Figure 4 This is a structural diagram of Embodiment 4 of the present invention.

[0020] Figure 5 This is a half-sectional view of Embodiment 4 of the present invention.

[0021] Figure 6 This is a structural diagram of Embodiment 5 of the present invention.

[0022] Figure 7 This is a diagram showing the distribution structure of the adhesive strip of the present invention on the pig tail pen.

[0023] Figure 8 This is a schematic diagram of the invention installed inside the human body.

[0024] The components are: 1. Stent body; 2. Pig tail pen; 3. Adhesive thread; 4. Through thread; 5. Through hole; 6. Biodegradable mesh tube; 7. Embedded thread; 8. Adhesive tape; 9. Adhesive strip segmentation; A. Renal pelvis; B. Bladder; C. Ureter; D. Upper stenosis. Detailed Implementation

[0025] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the biodegradable ureteral stent includes a stent body 1 and a curved pig tail ring 2 disposed at the renal pelvis end of the stent body 1. Both the stent body 1 and the pig tail ring 2 are made of biodegradable biomaterials and are integrally molded. Both the stent body 1 and the pig tail ring 2 are hollow round tubes.

[0027] In the specific manufacturing process of the stent body 1 and the pig tail ring 2, biodegradable biomaterials that meet the requirements are selected, raw material tubes are extruded according to specifications, and raw material tubes of the designed length are cut as stent body 1. One end of stent body 1 is selected as the pig tail ring end in the renal pelvis. After setting the adhesion structure, it is bent to form pig tail ring 2.

[0028] An adhesive structure is provided on the pig tail pen 2, and the adhesive structure is distributed along the entire length of the pig tail pen 2 and extends to the support body 1. For example... Figure 8 As shown, the adhesion structure can cover and extend beyond the portion of the pig tail ring 2 and the stent body 1 that extends into the narrow position of the ureter in the length direction. This allows all the segmented fragments of the pig tail ring 2 to adhere to the tube body of the stent body 1 outside the narrow position of the ureter during the degradation process.

[0029] The adhesive structure can be made of non-degradable biomaterials or biodegradable biomaterials. When the adhesive structure is made of biodegradable biomaterials, the degradation and breakage time of the adhesive structure should be later than the degradation and breakage time of the matching pig tail pen 2. That is, when the pig tail pen 2 degrades and breaks, the adhesive structure has not yet broken, and there is a certain interval between the two.

[0030] During use, during the decomposition of the pigtail ring 2, the adhesive structure can bind the multiple segmented fragments of the entire pigtail ring 2 together, preventing the decomposed pigtail ring 2 from falling into the lower calyx of the kidney. The bound segmented fragments of the pigtail ring 2 can be discharged into the bladder along with the degraded stent body 1 outside the renal pelvis and then excreted from the body through the urethra, avoiding the risk of a second surgery and reducing the pain caused to the patient.

[0031] like Figure 1 As shown, the adhesive structure is an adhesive line 3, which is adhered to the outer surface of the pig tail pen 2, with one end of the adhesive line 3 extending to the outer surface of the support body 1. The adhesive line 3 is spirally distributed along the tube of the pig tail pen 2 and the support body 1.

[0032] Depending on the needs, the adhesive lines 3 can also be distributed in a straight line along the length of the tube of the pig tail ring 2 and the support body 1, and there can be multiple adhesive lines 3.

[0033] like Figure 2 As shown, the bonding structure consists of a through-line 4 and multiple through-holes 5. The multiple through-holes 5 are distributed along the length of the pig tail pen 2 and the support body 1, and are arranged in a straight line. The through-line 4 is alternately inserted inside and outside along the multiple through-holes 5 and bonded to the inner and outer walls of the pig tail pen 2 and the support body 1.

[0034] As needed, the multiple through holes 5 can also be distributed in a spiral shape.

[0035] like Figure 3 As shown, the adhesive structure is a biodegradable mesh tube 6. The end of the biodegradable mesh tube 6 facing the support body 1 is open, and the end of the biodegradable mesh tube 6 facing the pig tail pen 2 is closed. The biodegradable mesh tube 6 is adhered to the outer surface of the pig tail pen 2 and extends all the way to the outer surface of the support body 1. The biodegradable mesh tube 6 is woven into a mesh structure using adhesive threads.

[0036] like Figure 4 and Figure 5 As shown, the adhesive structure consists of embedded wire 7 and grooves. The grooves are spirally distributed along the length of the pig tail ring 2 and the support body 1, and embedded wire 7 is adhered in the grooves.

[0037] As needed, there can be one or more grooves, and the grooves can also be distributed in a straight line along the length of the pig tail ring 2 and the support body 1.

[0038] like Figure 6 As shown, the adhesive structure is a strip-shaped adhesive tape 8, which is adhered to the outer surfaces of the pig tail collar 2 and the support body 1. The adhesive tape 8 is spirally distributed along the length of the pig tail collar 2 and the support body 1. The adhesive tape 8 is formed by applying implant-grade adhesive.

[0039] like Figure 7As shown, the adhesive structure can also be one or more sets of adhesive strips. Each set of adhesive strips includes multiple spaced adhesive strip segments 9. The multiple adhesive strip segments 9 are distributed in a straight line along the length direction of the pigtail collar 2 and the stent body 1. The adhesive strip segments 9 of adjacent sets of adhesive strips are staggered in the length direction, and the length of the adhesive strip segments 9 does not exceed 4 cm. The adhesive strips are formed by applying implant-grade adhesive.

[0040] The method of using this invention is as follows: During use, based on the clinical requirements for the duration of ureteral stent placement and the patient's ureteral examination results, select a stent body 1 and a pigtail loop 2 with appropriate degradation time and specifications. The invention is inserted through the vesicoureteral orifice, following the guidewire into the urethra, bladder, and ureter. The stent body 1 has graduations to mark the length of the stent inserted into the ureter. Pay attention to the graduations on the stent body 1. Once the pigtail loop 2 enters the renal pelvis, stop pushing. At this point, withdraw the guidewire, allowing the pigtail loop segment, which was straightened by the guidewire, to return to a loop shape. Hook and fix the ureteral stent in the renal pelvis. The ureteral stent placement is complete. After the predetermined degradation and breakage time of the stent body 1 and pigtail loop 2 is reached, the pigtail loop 2 degrades and breaks into segmented fragments. An adhesive structure connects these fragmented fragments together, allowing them to leave the renal pelvis along with the stent body 1, which has degraded outside the renal pelvis, drain into the bladder, and then exit the body through the urethra. This avoids the risk of a second surgery and reduces patient discomfort.

Claims

1. A biodegradable ureteral stent, comprising a stent body (1) and a curved pig tail collar (2) disposed at the renal pelvic end of the stent body (1), characterized in that: An adhesive structure is provided on the pig tail ring (2). The adhesive structure is distributed along the length of the pig tail ring (2) and extends to the support body (1). The adhesive structure can cover and exceed the portion of the pig tail ring (2) and the support body (1) that extends into the narrow position of the ureter in the length direction.

2. The biodegradable ureteral stent as described in claim 1, characterized in that: The stent body (1) and the pig tail ring (2) are both made of biodegradable biomaterials and are integrally formed. The stent body (1) and the pig tail ring (2) are both hollow round tubes.

3. The biodegradable ureteral stent as described in claim 2, characterized in that: The adhesive structure is an adhesive line (3), which is adhered to the outer surface of the pig tail ring (2) and extends to the outer surface of the support body (1). The adhesive line (3) is spirally distributed along the tube of the pig tail ring (2) and the support body (1).

4. The biodegradable ureteral stent as described in claim 3, characterized in that: The adhesion lines (3) are distributed in a spiral or in a straight line along the tube of the pig tail ring (2) and the support body (1).

5. The biodegradable ureteral stent as described in claim 2, characterized in that: The adhesive structure consists of a through-line (4) and multiple through-holes (5). The multiple through-holes (5) are distributed along the length of the pig tail pen (2) and the support body (1). The through-line (4) is alternately inserted inside and outside along the multiple through-holes (5) and adhered to the inner and outer walls of the pig tail pen (2) and the support body (1).

6. The biodegradable ureteral stent as described in claim 5, characterized in that: The multiple through holes (5) are distributed in a straight line or in a spiral shape.

7. The biodegradable ureteral stent as described in claim 2, characterized in that: The adhesive structure consists of an embedded wire (7) and a groove. The groove is spirally distributed along the length of the pig tail ring (2) and the support body (1), and the embedded wire (7) is adhered in the groove.

8. The biodegradable ureteral stent as described in claim 2, characterized in that: The adhesive structure is a tape (8), which is adhered to the outer surface of the pig tail pen (2) and the support body (1). The tape (8) is distributed in a spiral shape along the length of the pig tail pen (2) and the support body (1).

9. The biodegradable ureteral stent as described in claim 2, characterized in that: The adhesive structure is at least one set of adhesive strips, each set of adhesive strips includes multiple spaced adhesive strip segments (9), the multiple adhesive strip segments (9) are distributed in a straight line along the length direction of the pig tail pen (2) and the support body (1), and the adhesive strip segments (9) of adjacent sets of adhesive strips are staggered in the length direction.

10. The biodegradable ureteral stent as described in claim 2, characterized in that: The adhesive structure is a biodegradable mesh tube (6). The biodegradable mesh tube (6) has an open end facing the support body (1) and a closed end facing the pig tail pen (2). The biodegradable mesh tube (6) is adhered to the outer surface of the pig tail pen (2) and extends all the way to the outer surface of the support body (1).

Images