A ureteral stent suitable for imaging follow-up

Abstract

A ureteral stent suitable for imaging follow-up includes a tubular object, the middle part of the tubular object is a straight section, and the two ends are bent inward in opposite directions to form a curled section. The wall of the tubular object is composed of a high-density section and a low-density section, the low-density section is composed of a low-density radiopaque material, and the high-density section is composed of a high-density non-radiopaque material. The high-density section and the low-density section are spirally coiled along the extension direction of the tubular object. 1. The spiral high-density section material can provide location information of foreign bodies inside and outside the ureteral stent. 2. The spirally arranged high-density section can provide information such as the location, size, and shape of the stone, and act as a ruler. 3. The spirally arranged high-density section can prevent the stent from being transected at the low-density section when arranged horizontally: if the high-density section and the low-density section of the present invention are spirally arranged, if transecting occurs, the high-density section will inevitably break, so it is inevitable to know the occurrence of the break and quickly obtain the location information of the break.

Description

Technical Field

[0001] The invention relates to human daily necessities, in particular to medical devices, and in particular to a ureteral stent suitable for imaging follow-up. Background Art

[0002] Urinary stones are a common disease in the urinary system. When stones fall from the kidneys into the ureters, they can cause upper urinary tract obstruction and renal colic. If the stones are small, they can often be discharged on their own after effective labor and ureteral spasm relief. When the stones are larger than 6mm, extracorporeal shock wave lithotripsy or even transurethral laser lithotripsy or stone removal are usually required. However, for small stones in the kidneys, a longer ureteroscope is required to reach them, and the steering system of the soft endoscope can reach every corner of the renal pelvis, so as to achieve the purpose of stone removal and lithotripsy.

[0003] For the above-mentioned surgical procedures, a ureteral stent is usually required before and after lithotripsy. In particular, for ureteral flexible endoscope lithotripsy, placing a ureteral stent one month before lithotripsy is beneficial for ureteral dilation and preparing the ureter for the thicker soft endoscope than the rigid ureteroscope. For patients after lithotripsy, due to the surgical operation and possible ureteral wall damage, a ureteral stent is routinely placed to prevent postoperative ureteral contracture.

[0004] However, when following up with imaging after ureteral stent placement, usually only the position of the ureter can be observed, but the internal and external conditions of the stent cannot be observed, which will affect the prognosis of the patient's urinary calculi. Therefore, a new ureteral stent that can provide internal and external information of the ureteral stent under high-resolution CT or abdominal X-ray is urgently needed.

[0005] Existing [Chinese invention] CN201220349850.9, spiral composite double-lumen ureteral stent tube, discloses a spiral composite double-lumen ureteral stent tube, which is composed of a double J-shaped stent tube and an outer spiral tube, the outer spiral tube is wound on the double J-shaped stent tube, and the angle between the fixed contact surface of the outer spiral tube and the double J-shaped stent tube is an obtuse angle. The outer spiral tube is wound on the double J-shaped stent tube, which can expand the narrow section and play a good drainage role. At the same time, since the contact surface angle between the outer spiral tube and the double J-shaped stent tube is an obtuse angle, the accumulation of foreign matter can be avoided. Although it has a spiral conceptual structure, it cannot provide information inside and outside the stent under imaging.

[0006] [Chinese invention] CN201220079131.X, a ureteral stent device, discloses a ureteral stent device, including a ureteral stent tube and a urinary catheter, wherein the traction line of the ureteral stent tube includes a magnetic adsorption section and an elastic section that makes the length of the traction line less than the length from the tail of the stent tube body to the patient's urethral opening after implantation in the patient's body when freely unfolded, the elastic section is an elastic silk thread, the elastic section is arranged between the stent tube body and the magnetic adsorption section, and the magnetic adsorption section is a silk thread provided with an intermittent iron core; the urinary catheter includes an outer sheath and an inner core, the inner core can be slidably mounted in the outer sheath, the inner surface of the outer sheath head and the outer surface of the inner core form a traction line fixing cavity, and the inner core is provided with a magnetic part near its own head. Compared with the existing traction line, the traction line of the ureteral stent device provided by the present invention stays completely in the patient's body during use, will not be contaminated by external dirt, and will not cause infection to the patient due to the contamination of the traction line, and at the same time, the patient will not feel uncomfortable due to the exposed thread head. Although there are intermittent iron core wires, they do not have the ability to provide accurate information and will block the information behind the magnetic line segment to a certain extent, and cannot provide any internal information of the ureteral stent. Secondly, the iron core wire is prone to artifacts, which confuse the audience.

[0007] [Chinese invention, Chinese invention authorization] CN201210224753.1, a ureteral stent tube with an iron mesh device, discloses a ureteral stent tube with an iron mesh device, the ureteral stent tube comprises a stent tube body, a traction line and a trawl, wherein one end of the traction line is fixedly connected to the tail of the stent tube body, and the other end is fixedly connected to a trawl net made of a polymer mesh wire fused with an iron material. Compared with the ureteral stent tube with only one traction line in the prior art, the provided ureteral stent tube adopts a trawl net made of a polymer mesh wire fused with an iron material. When the trawl net is dispersed into a mesh shape in the patient's body, it has a larger area and is easier to locate. Therefore, when using the provided ureteral stent tube, the operator can quickly locate the ureteral stent tube and its traction line located in the patient's body, further reducing the discomfort and pain brought to the patient during the process of removing the ureteral stent tube. Although the iron wire only forms a mesh in the bladder for easy removal, it cannot provide internal information in the ureteral stent through the iron wire, and the metal will produce artifacts under radiation, which will have a negative impact on follow-up. Summary of the invention

[0008] The object of the present invention is to provide a ureteral stent suitable for imaging follow-up, which solves the technical problem that the ureteral stent in the prior art cannot provide internal and external information of the stent under imaging.

[0009] The present invention discloses a ureteral stent suitable for imaging follow-up, comprising a tubular object, wherein the middle portion of the tubular object is a straight section, and both ends are bent inward in opposite directions to form a curled portion, the tube wall of the tubular object is composed of a high-density portion and a low-density portion, the low-density portion is composed of a low-density radiopaque material, and the high-density portion is composed of a high-density radiopaque material, and the high-density portion and the low-density portion are spirally coiled along the extension direction of the tubular object.

[0010] Furthermore, the high-density portion is buried in the low-density portion.

[0011] Furthermore, the first width of the high-density portion in the axial direction of the tubular object is smaller than the first width of the low-density portion in the axial direction of the tubular object.

[0012] Furthermore, a first width of the high-density portion in the axial direction of the tubular object is 0.5 mm, and a second width of the low-density portion in the axial direction of the tubular object is 2 mm.

[0013] Furthermore, the helix angle of the spiral winding of the high-density portion is 45°.

[0014] Compared with the prior art, the effects of the present invention are positive and obvious.

[0015] 1. The spiral high-density material can provide location information of foreign bodies inside and outside the ureteral stent.

[0016] 2. The spirally arranged high-density part can provide information such as the location, size, and shape of the stones, acting as a ruler.

[0017] 3. The spiral arrangement of the high-density part can prevent the loss of information when the stent is transversely arranged at the low-density part: If the high-density part and the low-density part are arranged in parallel, then when the stent is accidentally broken, there are two situations: 1. The break is in the high-density part, and it can be seen that the length of the high-density area at the broken end is shortened, and the length of a complete high-density part can be obtained by adding the two ends; 2. When the break occurs in the low-density part, because the imaging is not clear, it is impossible to know the specific location of the break, how the break occurs, what the cross-section is like, and sometimes even when the break occurs, it is impossible to know, resulting in complications such as ureteral obstruction. However, if the high-density part and the low-density part of the present invention are arranged in a spiral, if a cross-section occurs, the high-density part will inevitably break, so it is inevitable to know the occurrence of the break and quickly obtain the location information of the break, so as to quickly provide a treatment plan.

[0018] 4. It facilitates imaging follow-up for patients with indwelling ureteral stents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic structural diagram of a ureteral stent suitable for imaging follow-up.

[0020] Figure 2 for Figure 1 A is a schematic diagram of a local enlarged structure. DETAILED DESCRIPTION Example

[0021] like Figure 1 and Figure 2 As shown, a ureteral stent suitable for imaging follow-up of the present invention includes a tubular object, the middle part of the tubular object is a straight section 1, and the two ends are bent inward in opposite directions to form a curled portion 2, the tube wall of the tubular object is composed of a high-density portion 3 and a low-density portion 4, the low-density portion 4 is composed of a low-density radiopaque material, and the high-density portion 3 is composed of a high-density non-radiopaque material, and the high-density portion 3 and the low-density portion 4 are spirally coiled along the extension direction of the tubular object.

[0022] Furthermore, the high-density portion 3 is buried in the low-density portion 4, making the inner and outer walls of the tube smooth.

[0023] Furthermore, the first width 5 of the high-density portion 3 in the axial direction of the tubular object is smaller than the second width 6 of the low-density portion 4 in the axial direction of the tubular object.

[0024] Furthermore, the first width 5 of the high-density portion 3 in the axial direction of the tubular object is 0.5 mm, and the second width 6 of the low-density portion 4 in the axial direction of the tubular object is 2 mm.

[0025] Furthermore, the helix angle 7 of the spiral winding of the high-density portion 3 is 45°.

[0026] The working principle of this embodiment:

[0027] The ureteral stent suitable for imaging follow-up of the present invention is designed for spiral imaging and can provide internal and external information of the ureteral stent. The low-density part 4 is a low-density radiopaque material, and the high-density part 3 is a high-density radiopaque material with a high transmittance, which can reflect the internal information of the stent under radiation.

[0028] Advantages and effects of the present invention:

[0029] 1. The spiral high-density portion 3 material can provide location information of foreign matter inside and outside the ureteral stent.

[0030] 2. The spirally arranged high-density portion 3 can provide information such as the location, size, and shape of the stone, and act as a ruler.

[0031] 3. The spiral arrangement of the high-density portion 3 can prevent the loss of information when the stent is transversely arranged at the low-density portion 4: If the high-density portion 3 and the low-density portion 4 are arranged in parallel in the transverse direction, there are two situations when the stent is accidentally broken: 1. The break occurs in the high-density portion 3, and it can be seen that the length of the high-density area at the broken end is shortened, and the sum of the two ends can get the length of a complete high-density portion 3; 2. When the break occurs in the low-density portion 4, because the imaging is not clear, it is impossible to know the specific location of the break, how the break occurs, what the cross-section is like, and sometimes even when the break occurs, it is impossible to know, resulting in complications such as ureteral obstruction. However, if the high-density portion 3 and the low-density portion 4 of the present invention are spirally arranged, if transverse cross-section occurs, the high-density portion 3 will inevitably break, so it is inevitable to know the occurrence of the break and quickly obtain the location information of the break, so as to quickly provide a treatment plan.

[0032] 4. It facilitates imaging follow-up for patients with indwelling ureteral stents.

Claims

1. A ureteral stent suitable for imaging follow-up, characterized in that: The invention comprises a tubular object, wherein the middle portion of the tubular object is a straight section (1), and the two ends are bent inward in opposite directions to form a curled section (2). The wall of the tubular object is composed of a high-density section (3) and a low-density section (4), wherein the low-density section (4) is composed of a low-density radiopaque material, and the high-density section (3) is composed of a high-density radiopaque material. The high-density section (3) and the low-density section (4) are spirally wound at intervals along the extension direction of the tubular object, wherein a first width (5) of the high-density section (3) in the axial direction of the tubular object is smaller than a second width (6) of the low-density section (4) in the axial direction of the tubular object, and a helical angle (7) of the spirally wound high-density section (3) is 45°.

2. A ureteral stent suitable for imaging follow-up according to claim 1, characterized in that: The high-density portion (3) is buried in the low-density portion (4).

3. A ureteral stent suitable for imaging follow-up according to claim 1, characterized in that: The first width (5) of the high-density portion (3) in the axial direction of the tubular object is 0.5 mm, and the second width (6) of the low-density portion (4) in the axial direction of the tubular object is 2 mm.

Images