Drainage device for preventing urine backflow and method of manufacture

Abstract

The application relates to a drainage device for preventing urine backflow and a preparation method, and the drainage device comprises a drainage unit and a check unit; a first end of the drainage unit is located inside a lesion, a second end of the drainage unit is located outside the lesion, and the drainage unit is used for draining liquid in the lesion to the outside; the check unit is arranged inside the drainage unit and is used for preventing the liquid from flowing from the second end of the drainage unit to the first end of the drainage unit. The advantage lies in that the check unit can effectively prevent liquid backflow and avoid secondary infection of a patient.

Description

Technical Field

[0001] This invention relates to the field of drainage tube technology, and in particular to a drainage device and its preparation method for preventing urine backflow. Background Technology

[0002] Double-J stents, also known as double pigtail stents, are named for their curled ends, each resembling a pig's tail. During surgical procedures, double-J stents are implanted to drain urine, prevent ureteral stricture and adhesions, prevent postoperative urinary leakage, and facilitate the passage of fragmented urinary stones. In use, the two ends of the double-J stent are inserted into the renal pelvis and bladder, respectively. Under normal circumstances, the pressure within the renal pelvis is greater than the pressure within the bladder, allowing urine to flow from the renal pelvis through the double-J stent to the bladder, thus providing drainage. However, if a patient holds their urine for too long, the pressure within the bladder may exceed the pressure within the renal pelvis, causing urine to flow back into the renal pelvis, leading to infections such as pyelonephritis, upper urinary tract infections, and hydronephrosis. Currently, double-J stents are generally made of materials such as polyurethane and can remain in the body for 3-12 months.

[0003] In existing technologies, CN201692482U incorporates a pair of valves curved in the direction of fluid flow within the main body of the double-J tube. These valves open when the fluid flows downstream and close when it flows upstream, forming a one-way valve structure to prevent reflux. CN204951752U adds a one-way valve at the lower end of the double-J tube to prevent bladder reflux. It also incorporates an anti-reflux horn-shaped diaphragm within the double-J tube. However, in practical applications, the double-J tube is only about 2mm in diameter. Implementing a valve with a specific curvature within such a thin tube to achieve anti-reflux is extremely difficult and difficult to widely implement. Therefore, to date, traditional double-J tubes continue to be used clinically, leading to numerous complications such as urine reflux, upper urinary tract infections, and hydronephrosis.

[0004] Currently, no effective solutions have been proposed for the problems existing in related technologies, such as the inability to prevent urine reflux and avoid secondary infection. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a drainage device and preparation method for preventing urine reflux, thereby solving problems such as the inability to prevent urine reflux and avoid secondary infection in related technologies.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a drainage device for preventing urine reflux, comprising:

[0008] A drainage unit, wherein the first end of the drainage unit is located inside the affected area and the second end of the drainage unit is located outside the affected area, for draining fluid from the affected area to the outside;

[0009] A check valve unit is disposed inside the drainage unit to prevent liquid from flowing from the second end of the drainage unit to the first end of the drainage unit.

[0010] In some embodiments, the drainage unit includes:

[0011] A drainage element, wherein the first end of the drainage element is located inside the affected area and the second end of the drainage element is located outside the affected area, for draining fluid from the affected area to the outside;

[0012] A first curling element is connected to a first end of the drainage element to fix the position of the first end of the drainage element;

[0013] The second curling element is connected to the second end of the drainage element and is used to fix the position of the second end of the drainage element.

[0014] In some embodiments, the check unit includes:

[0015] A plurality of first channel elements are obliquely distributed inside the drainage unit;

[0016] A plurality of second channel elements are obliquely distributed inside the drainage unit. The first end of a second channel element is connected to the second end of a first channel element, and the second end of a second channel element is connected to the first end of another first channel element. The oblique direction of the second channel element is different from that of the first channel element.

[0017] A plurality of third channel elements are disposed in a curved manner inside the drainage unit and located on one side of the corresponding first channel element. The two ends of the third channel elements are respectively connected to the corresponding first channel elements, and the third channel elements are curved toward the first end of the drainage unit.

[0018] A plurality of fourth channel elements are disposed in a curved manner inside the drainage unit and located on one side of the corresponding second channel element. The two ends of the fourth channel elements are respectively connected to the corresponding second channel elements. The fourth channel elements are disposed on different sides from the third channel elements. The fourth channel elements are curved toward the first end of the drainage unit.

[0019] In the case where liquid flows from the first channel element located at the second end of the drainage unit to the first channel element located at the first end of the drainage unit, the liquid enters the corresponding third channel element through the first channel element and returns to the first channel element, thereby preventing the liquid from flowing from the second end of the drainage unit to the first end of the drainage unit.

[0020] In some embodiments, the check unit includes:

[0021] A plurality of check elements are distributed inside the drainage unit and inclined toward the second end of the drainage unit;

[0022] In the case where liquid flows from the second end of the drainage unit to the first end of the drainage unit, the liquid flows through the check element and toward the second end of the drainage unit to prevent the liquid from flowing from the second end of the drainage unit to the first end of the drainage unit.

[0023] In some embodiments, several of the check elements are arranged circumferentially along the drainage unit.

[0024] In some embodiments, several of the check elements are distributed along the axial direction of the drainage unit.

[0025] In some of these embodiments, the check element is tilted axially toward the drainage unit.

[0026] In some of these embodiments, the check element is tilted circumferentially toward the drainage unit.

[0027] In some of these embodiments, the check valve units are arranged in a spiral pattern.

[0028] In some embodiments, the tilt angle of the check unit changes from the second end of the drainage unit to the first end of the drainage unit.

[0029] In some of these embodiments, the size of the check unit varies from the second end of the drainage unit to the first end of the drainage unit.

[0030] In some embodiments, the wall thickness of the drainage unit with the check valve is different from the wall thickness of the drainage unit without the check valve.

[0031] In a second aspect, a method for preparing a drainage device is provided, for preparing the drainage device as described in the first aspect, comprising:

[0032] The drainage device was prepared using 3D printing.

[0033] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0034] The present invention provides a drainage device and preparation method for preventing urine backflow. By setting a check unit, it can effectively prevent fluid backflow and avoid secondary infection in patients. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the drainage device according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a drainage unit according to an embodiment of the present invention;

[0037] Figure 3 This is a cross-sectional view (a) of the check valve unit according to an embodiment of the present invention;

[0038] Figure 4 This is a cross-sectional view (II) of the check valve unit according to an embodiment of the present invention;

[0039] Figure 5 This is a cross-sectional view (iii) of the check valve unit according to an embodiment of the present invention;

[0040] Figure 6 This is a cross-sectional view (four) of the check valve unit according to an embodiment of the present invention;

[0041] Figures 7a-7b This is a cross-sectional view (V) of the check valve unit according to an embodiment of the present invention;

[0042] Figure 8 This is a cross-sectional view (six) of the check valve unit according to an embodiment of the present invention;

[0043] Figure 9 This is a cross-sectional view (seven) of the check valve unit according to an embodiment of the present invention;

[0044] Figure 10 This is a cross-sectional view (eight) of the check valve unit according to an embodiment of the present invention;

[0045] Figure 11 This is a cross-sectional view (nine) of the check valve unit according to an embodiment of the present invention.

[0046] The reference numerals in the attached drawings are: 100, drainage unit; 110, drainage element; 120, first curling element; 130, second curling element;

[0047] 200, Check valve unit; 210, First channel element; 220, Second channel element; 230, Third channel element; 240, Fourth channel element; 250, Check valve element. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0051] Example 1

[0052] An illustrative embodiment of the present invention, such as Figure 1 As shown, a drainage device for preventing urine backflow includes a drainage unit 100 and a check unit 200. The first end of the drainage unit 100 is located inside the affected area, and the second end of the drainage unit 100 is located outside the affected area, for draining fluid from the affected area to the outside; the check unit 200 is disposed inside the drainage unit 100, for preventing fluid from flowing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0053] like Figure 2 As shown, the drainage unit 100 includes a drainage element 110, a first coiling element 120, and a second coiling element 130. The first end of the drainage element 110 is located inside the affected area, and the second end of the drainage element 110 is located outside the affected area, for draining fluid from the affected area to the outside. The first coiling element 120 is connected to the first end of the drainage element 110 to fix the position of the first end of the drainage element 110. The second coiling element 130 is connected to the second end of the drainage element 110 to fix the position of the second end of the drainage element 110.

[0054] Generally, the drainage element 110, the first curling element 120, and the second curling element 130 are integrally formed.

[0055] The drainage unit 100 is a drainage tube made of polyurethane material.

[0056] like Figure 3As shown, the check valve unit 200 includes a plurality of first channel elements 210, a plurality of second channel elements 220, a plurality of third channel elements 230, and a plurality of fourth channel elements 240. The plurality of first channel elements 210 are obliquely distributed inside the drainage unit 100; the plurality of second channel elements 220 are obliquely distributed inside the drainage unit 100, with a first end of each second channel element 220 connected to a second end of a first channel element 210 and a second end of each second channel element 220 connected to a first end of another first channel element 210, and the oblique direction of the second channel elements 220 is different from that of the first channel elements 210; the plurality of third channel elements 230 are curvedly distributed inside the drainage unit 100 and located at corresponding first channel elements 240. On one side of channel element 210, the two ends of the third channel element 230 are respectively connected to the corresponding first channel element 210, and the third channel element 230 is bent toward the first end of the drainage unit 100; a plurality of fourth channel elements 240 are bently distributed inside the drainage unit 100 and located on one side of the corresponding second channel element 220, the two ends of the fourth channel element 240 are respectively connected to the corresponding second channel element 220, the fourth channel element 240 and the third channel element 230 are arranged on different sides, and the fourth channel element 240 is bent toward the first end of the drainage unit 100.

[0057] The check mechanism of the check unit 200 is as follows:

[0058] When liquid flows from the first channel element 210 located at the second end of the drainage unit 100 to the first channel element 210 located at the first end of the drainage unit 100, the liquid enters the corresponding third channel element 230 through the first channel element 210 and returns to the first channel element 210, thereby preventing the liquid from flowing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0059] The check unit 200 is provided at least at the second end of the drainage unit 100.

[0060] Specifically, the check unit 200 is disposed at least inside the second end of the drainage element 110.

[0061] In some of these embodiments, the check unit 200 is also disposed inside the second coiling element 130.

[0062] In some of these embodiments, the check unit 200 and the drainage unit 100 are integrally formed.

[0063] In some of these embodiments, the wall thickness of the drainage unit 100 with the check valve 200 is less than the wall thickness of the drainage unit 100 without the check valve 200.

[0064] Generally, a plurality of first channel elements 210, a plurality of second channel elements 220, a plurality of third channel elements 230, and a plurality of fourth channel elements 240 are integrally formed.

[0065] There are at least three first channel elements 210. Several first channel elements 210 are distributed at intervals along the axial direction of the drainage element 110, and the several first channel elements 210 are parallel to each other.

[0066] The tilt angle of the first channel element 210 is 30° to 60°. Preferably, the tilt angle of the first channel element 210 is 35° to 55°. More preferably, the tilt angle of the first channel element 210 is 40° to 50°.

[0067] The dimensions of the first channel element 210 are matched with the dimensions of the drainage element 110. Generally, the dimensions of the first channel element 210 are smaller than the dimensions of the drainage element 110. Specifically, the diameter of the first channel element 210 is smaller than the inner diameter of the drainage element 110.

[0068] In some embodiments, the first channel element 210 includes a first straight tube. The first straight tube is disposed inside the drainage element 110.

[0069] There are at least two second channel elements 220. A plurality of second channel elements 220 are distributed at intervals along the axial direction of the drainage element 110, and the plurality of second channel elements 220 are parallel to each other.

[0070] The number of second channel elements 220 matches the number of first channel elements 210. Generally, the number of second channel elements 220 is less than the number of first channel elements 210, and the difference is 1.

[0071] The angle between the second channel element 220 and the first channel element 210 is 60° to 120°. Preferably, the angle between the second channel element 220 and the first channel element 210 is 70° to 110°. More preferably, the angle between the second channel element 220 and the first channel element 210 is 80° to 100°.

[0072] Generally, the angle formed between the second channel element 220 and the first channel element 210 is an obtuse angle.

[0073] In some embodiments, the second channel element 220 is mirror-symmetrical to the corresponding first channel element 210.

[0074] The dimensions of the second channel element 220 are matched with those of the first channel element 210. Generally, the diameter of the second channel element 220 is equal to the diameter of the first channel element 210.

[0075] In some of these embodiments, the length of the second channel element 220 is equal to the length of the first channel element 210.

[0076] In some embodiments, the second channel element 220 includes a second straight tube. The second straight tube is disposed inside the drainage element 110, with a first end connected to a second end of a first straight tube and the second end of the second straight tube connected to a first end of another first straight tube.

[0077] There are at least two third channel elements 230. A plurality of third channel elements 230 are distributed at intervals along the axial direction of the drainage element 110, and the plurality of third channel elements 230 are disposed on the same side of the drainage element 110.

[0078] The number of third channel elements 230 matches the number of first channel elements 210. Generally, the number of third channel elements 230 is less than the number of first channel elements 210, and the difference is 1.

[0079] In some embodiments, the third channel element 230 includes a third straight tube and a first bend. The second end of the third straight tube is connected to the first end of the second straight tube and the second end of the first straight tube; the first end of the first bend is connected to the middle of the first straight tube, and the second end of the first bend is connected to the first end of the third straight tube.

[0080] Generally, the inclination angle of the third straight pipe is equal to the inclination angle of the second straight pipe.

[0081] The connection point between the first bend and the first straight pipe is between 1 / 3 and 2 / 3 of the length of the first straight pipe.

[0082] Preferably, the connection point between the first bend and the first straight pipe is located near the second end of the first straight pipe.

[0083] There are at least two fourth channel elements 240. A plurality of fourth channel elements 240 are distributed at intervals along the axial direction of the drainage element 110, and the plurality of fourth channel elements 240 are disposed on the same side of the drainage element 110.

[0084] The number of fourth channel elements 240 matches the number of second channel elements 220. Generally, the number of fourth channel elements 240 is equal to the number of second channel elements 220.

[0085] In some embodiments, the fourth channel element 240 includes a fourth straight tube and a second bend. The second end of the fourth straight tube is connected to the first end of the first straight tube and the second end of the second straight tube; the first end of the second bend is connected to the second end of the first straight tube and the first end of the second straight tube, and the second end of the second bend is connected to the first end of the fourth straight tube.

[0086] Generally, the inclination angle of the fourth straight pipe is equal to the inclination angle of the first straight pipe.

[0087] The drainage device of the present invention can be manufactured by 3D printing.

[0088] The method of using this invention is as follows:

[0089] Taking an example of having two first channel elements 210, one second channel element 220, one third channel element 230 and one fourth channel element 240, the first channel element 210a is closer to the first end of the drainage element 110, and the first channel element 210b is closer to the second end of the drainage element 110.

[0090] (I) Normal Use

[0091] When liquid enters the first end of the first channel element 210a, the liquid flow sequence is as follows:

[0092] 1) First channel element 210a → Second channel element 220 → First channel element 210b;

[0093] 2) First channel element 210a → Third channel element 230 → Second channel element 220 → First channel element 210b;

[0094] 3) First channel element 210a → Second channel element 220 → Fourth channel element 240 → First channel element 210b;

[0095] 4) First channel element 210a → Third channel element 230 → Second channel element 220 → Fourth channel element 240 → First channel element 210b;

[0096] Since the flow direction of the liquid is the same in the first channel element 210a, the second channel element 220, the third channel element 230, and the fourth channel element 240, the liquid at the affected area is not affected by resistance when it flows outward.

[0097] (ii) Preventing backflow

[0098] When liquid enters the second end of the first channel element 210b, the liquid flow sequence is as follows:

[0099] 1) First channel element 210b → Fourth channel element 240 → First channel element 210b;

[0100] 2) First channel element 210b → Second channel element 220 → Third channel element 230 → Second channel element 220;

[0101] 3) First channel element 210b → Fourth channel element 240 → First channel element 210b → Second channel element 220 → Third channel element 230 → Second channel element 220;

[0102] In case 1), when the liquid flows from the first end of the fourth channel element 240 to the first end of the first channel element 210b, the flow direction of the liquid flowing out of the fourth channel element 240 is opposite to the flow direction of the liquid flowing out of the first channel element 210b, which causes the liquid to be unable to continue flowing to the first end of the guiding element 110, thus preventing the liquid from flowing back.

[0103] In case 2), when the liquid flows from the first end of the third channel element 230 to the first end of the second channel element 220, the flow direction of the liquid flowing out of the third channel element 230 is opposite to the flow direction of the liquid flowing out of the second channel element 220, which causes the liquid to be unable to continue flowing to the first end of the guiding element 110, thus preventing the liquid from flowing back.

[0104] In case 3), when liquid flows from the first end of the fourth channel element 240 to the first end of the first channel element 210b and from the first end of the third channel element 230 to the first end of the second channel element 220, the flow direction of the liquid flowing out of the fourth channel element 240 is opposite to the flow direction of the liquid flowing out of the first channel element 210b, and the flow direction of the liquid flowing out of the third channel element 230 is opposite to the flow direction of the liquid flowing out of the second channel element 220, thereby preventing liquid backflow.

[0105] The advantage of this invention is that by setting a check valve, it can effectively prevent fluid backflow and avoid secondary infection of the patient.

[0106] Example 2

[0107] This embodiment is a modified embodiment of Embodiment 1. The difference between this embodiment and Embodiment 1 is that the structure of the check unit 200 is different.

[0108] like Figure 4 As shown, the check valve unit 200 is arranged in a spiral configuration. Specifically, a plurality of first channel elements 210, a plurality of second channel elements 220, a plurality of third channel elements 230 and a plurality of fourth channel elements 240 are respectively arranged in a spiral configuration.

[0109] A plurality of first channel elements 210 are distributed at intervals along the axial direction of the drainage element 110, and the plurality of first channel elements 210 are not parallel to each other.

[0110] Specifically, two adjacent first channel elements 210 are not parallel to each other, while two first channel elements 210 arranged at intervals are parallel to each other.

[0111] Specifically, for two parallel first channel elements 210, at least one first channel element 210 is disposed between the two first channel elements 210.

[0112] In this embodiment, the number of first channel elements 210 is at least four.

[0113] Several second channel elements 220 are distributed at intervals along the axial direction of the drainage element 110, and the several second channel elements 220 are not parallel to each other.

[0114] Specifically, two adjacent second channel elements 220 are not parallel to each other, while two second channel elements 220 that are spaced apart are parallel to each other.

[0115] Specifically, for two parallel second channel elements 220, at least one second channel element 220 is disposed between the two second channel elements 220.

[0116] In this embodiment, the number of second channel elements 220 is at least three.

[0117] Several third channel elements 230 are distributed at intervals along the axial direction of the drainage element 110, and the several third channel elements 230 are not disposed on the same side of the drainage element 110.

[0118] Specifically, two adjacent third channel elements 230 are not located on the same side of the drainage element 110, while two third channel elements 230 that are spaced apart are located on the same side of the drainage element 110.

[0119] Viewed from a cross-section of the drainage element 110 (a cut along the radial direction of the drainage element 110), the included angle between two adjacent third channel elements 230 is 30° to 150°. Preferably, the included angle between two adjacent third channel elements 230 is 30° to 120°. More preferably, the included angle between two adjacent third channel elements 230 is 30° to 90°. Even more preferably, the included angle between two adjacent third channel elements 230 is 45° to 90°.

[0120] In this embodiment, the number of third channel elements 230 is at least three.

[0121] A plurality of fourth channel elements 240 are distributed at intervals along the axial direction of the drainage element 110, and the plurality of fourth channel elements 240 are not disposed on the same side of the drainage element 110.

[0122] Specifically, two adjacent fourth channel elements 240 are not located on the same side of the drainage element 1110, while two fourth channel elements 240 that are spaced apart are located on the same side of the drainage element 110.

[0123] Viewed from a cross-section of the drainage element 110 (a radial cut along the drainage element 110), the included angle between two adjacent fourth channel elements 240 is 30° to 150°. Preferably, the included angle between two adjacent fourth channel elements 240 is 30° to 120°. More preferably, the included angle between two adjacent fourth channel elements 240 is 30° to 90°. Even more preferably, the included angle between two adjacent fourth channel elements 240 is 45° to 90°.

[0124] In this embodiment, the number of fourth channel elements 240 is at least three.

[0125] The usage method of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here.

[0126] The advantage of this embodiment is that, in the event of urine backflow / reflux, when the urine passes through the spirally arranged check valve, the drainage unit is twisted, and under the dual action, the urine cannot continue to flow to the first end of the drainage unit.

[0127] Example 3

[0128] This embodiment is a modified embodiment of Embodiments 1 and 2. The difference between this embodiment and Embodiments 1 and 2 is that the structure of the check unit 200 is different.

[0129] like Figure 5 As shown, the tilt angle of the check unit 200 changes from the second end of the drainage unit 100 to the first end of the drainage unit 100, including the tilt angle of the check unit 200 increasing from the second end of the drainage unit 100 to the first end of the drainage unit 100, or the tilt angle of the check unit 200 decreasing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0130] Specifically, the tilt angle of the first channel element 210 remains unchanged; the tilt angle of the second channel element 220 remains unchanged; the tilt angle of the third channel element 230 changes; and the tilt angle of the fourth channel element 240 changes.

[0131] For the third channel element 230, the tilt angle of the third straight tube is not greater than the tilt angle of the second straight tube of the corresponding second channel element 220.

[0132] Generally, the angle variation range of the third channel element 230 is 0 to 10°. Preferably, the angle variation range of the third channel element 230 is 2.5° to 7.5°. More preferably, the angle variation range of the third channel element 230 is 3° to 6°.

[0133] For the fourth channel element 240, the tilt angle of the fourth straight tube is not greater than the tilt angle of the first branch tube of the corresponding first channel element 210.

[0134] Generally, the angle variation range of the fourth channel element 240 is 0 to 10°. Preferably, the angle variation range of the fourth channel element 240 is 2.5° to 7.5°. More preferably, the angle variation range of the fourth channel element 240 is 3° to 6°.

[0135] In some of these embodiments, the angle of change of the fourth channel element 240 is equal to the angle of change of the third channel element 230.

[0136] The usage method of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here.

[0137] The advantage of this embodiment is that, in the event of urine backflow / reflux, the third and fourth channel elements with different tilt angles cause the drainage unit to twist, and under the dual action, the urine can no longer flow to the first end of the drainage unit.

[0138] Example 4

[0139] This embodiment is a modified embodiment of Embodiments 1 to 3. The difference between this embodiment and Embodiments 1 to 3 is that the structure of the check unit 200 is different.

[0140] like Figure 6 As shown, the size of the check unit 200 changes from the second end of the drainage unit 100 to the first end of the drainage unit 100, including either the size of the check unit 200 increasing from the second end of the drainage unit 100 to the first end of the drainage unit 100, or the size of the check unit 200 decreasing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0141] Specifically, the size of the first channel element 210 remains unchanged; the size of the second channel element 220 remains unchanged; the size of the third channel element 230 changes; and the size of the fourth channel element 240 changes.

[0142] For the third channel element 230, the size of the third straight tube is not greater than the size of the second straight tube of the corresponding second channel element 220.

[0143] For the fourth channel element 240, the size of the fourth straight tube is not greater than the size of the first straight tube of the corresponding first channel element 210.

[0144] The working principle of this embodiment is as follows:

[0145] (a) The size of the check unit 200 increases from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0146] The size of the fourth channel element 240 near the second end of the drainage unit 100 is smaller than that of the first channel element 210, so that the flow velocity of the liquid entering the fourth channel element 240 is greater than that of the liquid in the first channel element 210. The two streams of liquid come into contact with each other inside the first channel element 210, preventing the liquid from flowing to the first end of the drainage element 110.

[0147] (ii) The size of the check unit 200 decreases from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0148] When liquid enters the second channel element 220 through the first channel element 210 near the second end of the drainage unit 100, the total amount of liquid will decrease. Since the size of the third channel element 230 is smaller than the size of the corresponding second channel element 220, the flow velocity of the liquid entering the third channel element 230 is greater than the flow velocity of the liquid in the second channel element 220. The two streams of liquid come into contact inside the second channel element 220, preventing the liquid from flowing to the first end of the drainage element 110.

[0149] The advantage of this embodiment is that by changing the size of the check unit, liquids with different flow rates are formed, thereby causing the liquids to come into contact with each other inside the first channel element / second channel element in the event of urine backflow / reverse flow, preventing the urine from continuing to flow to the first end of the drainage unit.

[0150] Example 5

[0151] This embodiment is a modified embodiment of Embodiments 1 to 4. The difference between this embodiment and Embodiments 1 to 4 is that the structure of the check unit 200 is different.

[0152] like Figures 7a-7b As shown, the check unit 200 includes a plurality of check elements 250. The plurality of check elements 250 are distributed inside the drainage unit 100 and are inclined toward the second end of the drainage unit 100.

[0153] Specifically, a plurality of check elements 250 are distributed at least inside the drainage element 110 and are inclined toward the second end of the drainage element 110.

[0154] The check mechanism of the check unit 200 is as follows:

[0155] When liquid flows from the second end of the drainage unit 100 to the first end of the drainage unit 100, the liquid flows through the check element 250 and toward the second end of the drainage unit 100 to prevent the liquid from flowing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0156] The tilt angle of the check element 250 is an acute angle. Generally, the tilt angle of the check element 250 is no greater than 60°.

[0157] In some of these embodiments, the check element 250 is tilted axially toward the drainage element 110.

[0158] A plurality of check elements 250 are distributed circumferentially along the drainage element 110. Generally, the included angle between two adjacent check elements 250 is an acute angle. Preferably, the included angle between two adjacent check elements 250 is no greater than 45°. More preferably, the included angle between two adjacent check elements 250 is no greater than 30°. Even more preferably, the included angle between two adjacent check elements 250 is no greater than 20°.

[0159] In some embodiments, the bottoms of two adjacent check elements 250 are connected, while the tops of two adjacent check elements 250 do not contact each other. In this case, the radial dimension of the check element 250 decreases from its bottom to its top.

[0160] Several check elements 250 are distributed along the axial direction of the drainage element 110. Generally, the distance between two adjacent check elements 250 is greater than the length of the check element 250.

[0161] When several check valve elements 250 are distributed along the axial and circumferential directions of the drainage element 110, the check valve elements 250 are arranged in an array, i.e., m×n, where m is the number of elements distributed axially, n is the number of elements distributed circumferentially, and m≥2, n≥2. Specifically, for m... i and m i+1 In other words, it is set in m i Several check elements 250 and set at m i+1 Several check valve elements 250 are staggered. That is, when viewed from the cross-section of the drainage element 110 (cutting the drainage element 110 radially), located at m i A check valve located at m is provided between two adjacent check valve elements 250. i+1 The check element 250 is located at m i+1 A check valve located at m is provided between two adjacent check valve elements 250. i Check element 250.

[0162] In some of these embodiments, the wall thickness of the drainage unit 100 with the check element 250 is different from the wall thickness of the drainage unit 100 without the check element 250.

[0163] The usage method of this embodiment is as follows:

[0164] (I) Normal use - the liquid flows from the first end of the drainage unit 100 to the second end of the drainage unit 100.

[0165] Since the check element 250 is inclined toward the second end of the drainage unit 100, it will not obstruct the flow direction of the liquid;

[0166] (ii) Preventing backflow - the liquid flows from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0167] Because the check element 250 is tilted toward the second end of the drainage unit 100, the liquid flows back at the check element 250 to prevent the liquid from flowing toward the first end of the drainage unit 100.

[0168] The advantage of this invention is that by setting a check valve, it can effectively prevent fluid backflow and avoid secondary infection of the patient.

[0169] Example 6

[0170] This embodiment is a modified embodiment of Embodiment 5. The difference between this embodiment and Embodiment 5 is that the structure of the check unit 200 is different.

[0171] like Figure 8 As shown, a plurality of check elements 250 are arranged in a spiral pattern. Specifically, the plurality of check elements 250 are spirally arranged around the drainage unit 100 in both the axial and circumferential directions.

[0172] For two adjacent check elements 250, the axes of the two check elements 250 do not intersect.

[0173] Furthermore, the included angle between two adjacent check elements 250 is an acute angle. Preferably, the included angle between two adjacent check elements 250 is no greater than 45°. More preferably, the included angle between two adjacent check elements 250 is no greater than 30°. Even more preferably, the included angle between two adjacent check elements 250 is no greater than 20°.

[0174] In this embodiment, the number of check elements 250 is n×360° / the included angle between two adjacent check elements 250, where n≥2.

[0175] The usage method of this embodiment is basically the same as that of embodiment 5, and will not be repeated here.

[0176] The advantage of this embodiment is that, in the event of urine backflow / reflux, when the urine passes through several spirally arranged check elements, the drainage unit is twisted, and under the dual action, the urine cannot continue to flow to the first end of the drainage unit.

[0177] Example 7

[0178] This embodiment is a modified embodiment of Embodiments 5 and 6. The difference between this embodiment and Embodiments 5 and 6 is that the structure of the check unit 200 is different.

[0179] like Figure 9 As shown, several check elements 250 are inclined circumferentially toward the drainage unit 100.

[0180] Specifically, when viewed from the cross-section of the drainage element 110 (cutting the drainage element 110 radially), the check element 250 forms an angle with the radial direction of the drainage element 110. Preferably, this angle is no greater than 45°. More preferably, this angle is no greater than 30°. Even more preferably, this angle is no greater than 20°.

[0181] The usage method of this embodiment is basically the same as that of embodiment 5, and will not be repeated here.

[0182] The advantage of this embodiment is that, in the event of urine backflow / reflux, when the urine passes through several check elements located on the same plane, the urine undergoes rotational disturbance, causing the drainage unit to twist. Under the dual action, the urine cannot continue to flow to the first end of the drainage unit.

[0183] Example 8

[0184] This embodiment is a modified embodiment of Embodiments 5 to 7. The difference between this embodiment and Embodiments 5 to 7 is that the structure of the check unit 200 is different.

[0185] like Figure 10 As shown, the size of the check unit 200 changes from the second end of the drainage unit 100 to the first end of the drainage unit 100, including the size of the check element 250 increasing from the second end of the drainage unit 100 to the first end of the drainage unit 100, or the size of the check element 250 decreasing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0186] Generally, the angle of the check element 250 varies from 0 to 10°. Preferably, the angle of the check element 250 varies from 2.5° to 7.5°. More preferably, the angle of the check element 250 varies from 3° to 6°.

[0187] The usage method of this embodiment is basically the same as that of embodiment 5, and will not be repeated here.

[0188] The advantage of this embodiment is that, in the event of urine backflow / reflux, the use of check elements with different tilt angles creates urine backflow at different speeds, thereby preventing urine from continuing to flow to the first end of the drainage unit.

[0189] Example 9

[0190] This embodiment is a modified embodiment of Embodiments 5 to 8. The difference between this embodiment and Embodiments 5 to 8 is that the structure of the check unit 200 is different.

[0191] like Figure 11 As shown, the size of the check unit 200 changes from the second end of the drainage unit 100 to the first end of the drainage unit 100, including the size of the check element 250 increasing from the second end of the drainage unit 100 to the first end of the drainage unit 100, or the size of the check element 250 decreasing from the second end of the drainage unit 100 to the first end of the drainage unit 100.

[0192] Specifically, the length of the check element 250 changes, and / or the radial dimension of the check element 250 changes.

[0193] The advantage of this embodiment is that by changing the size of the check element, different flow rates / flow rates of reflux liquid are formed, thereby preventing urine from continuing to flow to the first end of the drainage unit in the event of urine reflux / backflow.

[0194] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A drainage device for preventing urine reflux, characterized in that, include: A drainage unit, wherein the first end of the drainage unit is located inside the affected area and the second end of the drainage unit is located outside the affected area, for draining fluid from the affected area to the outside; A check valve unit is disposed inside the drainage unit to prevent liquid from flowing from the second end of the drainage unit to the first end of the drainage unit; The check unit includes: A plurality of first channel elements are obliquely distributed inside the drainage unit; A plurality of second channel elements are obliquely distributed inside the drainage unit. The first end of a second channel element is connected to the second end of a first channel element, and the second end of a second channel element is connected to the first end of another first channel element. The oblique direction of the second channel element is different from that of the first channel element. A plurality of third channel elements are disposed in a curved manner inside the drainage unit and located on one side of the corresponding first channel element. The two ends of the third channel elements are respectively connected to the corresponding first channel elements, and the third channel elements are curved toward the first end of the drainage unit. A plurality of fourth channel elements are disposed in a curved manner inside the drainage unit and located on one side of the corresponding second channel element. The two ends of the fourth channel elements are respectively connected to the corresponding second channel elements. The fourth channel elements are disposed on different sides from the third channel elements. The fourth channel elements are curved toward the first end of the drainage unit. Wherein, when liquid flows from the first channel element located at the second end of the drainage unit to the first channel element located at the first end of the drainage unit, the liquid enters the corresponding third channel element through the first channel element and returns to the first channel element, thereby preventing liquid from flowing from the second end of the drainage unit to the first end of the drainage unit; The included angle between the second channel element and the first channel element is 60° to 120°.

2. The drainage device according to claim 1, characterized in that, The drainage unit includes: A drainage element, wherein the first end of the drainage element is located inside the affected area and the second end of the drainage element is located outside the affected area, for draining fluid from the affected area to the outside; A first curling element is connected to a first end of the drainage element to fix the position of the first end of the drainage element; The second curling element is connected to the second end of the drainage element and is used to fix the position of the second end of the drainage element.

3. The drainage device according to claim 2, characterized in that, The first channel element includes: The first straight tube is disposed inside the drainage element; The second channel element includes: A second straight tube is disposed inside the drainage element. The first end of the second straight tube is connected to the second end of a first straight tube, and the second end of the second straight tube is connected to the first end of another first straight tube. The third channel element includes: The third straight pipe, the second end of which is connected to the first end of the second straight pipe and the second end of the first straight pipe; The first bend is connected at its first end to the middle of the first straight pipe, and the second end of the first bend is connected to the first end of the third straight pipe. The fourth channel element includes: The fourth straight pipe, the second end of which is connected to the first end of the first straight pipe and the second end of the second straight pipe; The second bend is connected at its first end to the second end of the first straight pipe and the first end of the second straight pipe, and at its second end to the first end of the fourth straight pipe.

4. The drainage device according to claim 2, characterized in that, A plurality of first channel elements, a plurality of second channel elements, a plurality of third channel elements, and a plurality of fourth channel elements are respectively arranged in a spiral distribution; A plurality of first channel elements are distributed at intervals along the axial direction of the drainage unit, with adjacent first channel elements not parallel to each other, and two first channel elements arranged at intervals being parallel to each other. Several second channel elements are distributed at intervals along the axial direction of the drainage unit, with adjacent second channel elements not parallel to each other, and two second channel elements arranged at intervals being parallel to each other; Several third channel elements are distributed at intervals along the axial direction of the drainage element. Two adjacent third channel elements are not located on the same side of the drainage element, while two spaced-apart third channel elements are located on the same side of the drainage element. Several fourth channel elements are distributed at intervals along the axial direction of the drainage element. Two adjacent fourth channel elements are not located on the same side of the drainage element, while two fourth channel elements that are spaced apart are located on the same side of the drainage element.

5. The drainage device according to claim 1, characterized in that, The tilt angle of the check unit changes from the second end of the drainage unit to the first end of the drainage unit; The tilt angle of the first channel element remains unchanged; The tilt angle of the second channel element remains unchanged; The tilt angle of the third channel element changes; The tilt angle of the fourth channel element changes.

6. The drainage device according to claim 5, characterized in that, The angle variation range of the third channel element is 0~10°; The angle variation range of the fourth channel element is 0~10°.

7. The drainage device according to claim 1, characterized in that, The size of the check valve unit changes from the second end of the drainage unit to the first end of the drainage unit; The size of the first channel element remains unchanged; The dimensions of the second channel element remain unchanged; The size change of the third channel element; The size change of the fourth channel element.

8. A method for preparing a drainage device, used to prepare the drainage device as described in any one of claims 1 to 7, characterized in that, include: The drainage device was prepared using 3D printing.

Images