Dialysis catheters and dialysis systems

Abstract

This utility model relates to the field of medical device technology and discloses a dialysis catheter and a dialysis system. The dialysis catheter includes a catheter body. By defining a first lumen and a second lumen on the catheter body, and symmetrically arranging the distal opening trajectory of the first lumen and the distal opening trajectory of the second lumen with respect to the axis of the catheter body, the dialysis catheter can be manufactured by simple cutting. It can use both soft and hard materials, reducing the manufacturing difficulty of the dialysis catheter. Along the axial direction of the catheter body, compared with other positions on the first curve, the distance between the endpoint farthest from the interval and the dialysis device is the shortest, that is, the attraction force is the strongest at this endpoint. On the first curve, along the direction from this endpoint towards the interval, the attraction force gradually decreases until it can no longer attract liquid. This avoids the dialysis liquid that has been dialyzed from mixing with the liquid to be dialyzed in related technologies, which would reduce dialysis efficiency, thereby improving the dialysis efficiency of the dialysis catheter.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to dialysis catheters and dialysis systems. Background Technology

[0002] Hemodialysis involves draining blood from the patient's body and passing it through a dialyzer composed of numerous hollow fibers. The blood and an electrolyte solution of similar concentration to the body exchange substances through diffusion, ultrafiltration, adsorption, and convection within the hollow tubes. This process removes metabolic waste, maintains electrolyte and acid-base balance, and eliminates excess water. The purified blood is then returned to the patient.

[0003] The dialysis process involves connecting the patient's blood to the dialyzer via a dialysis catheter. Specifically, the dialysis catheter includes an arterial lumen and a venous lumen, spaced apart. According to operating procedures, the arterial lumen connects to the dialyzer's inlet, and the venous lumen connects to the dialyzer's outlet. Under the negative pressure of the dialyzer, the patient's blood is drawn into the dialyzer through the tip of the arterial lumen, and the dialyzed blood is then returned to the patient through the tip of the venous lumen. However, in practice, there are cases where the arterial and venous lumen are connected in reverse; that is, the patient's blood is drawn into the dialyzer through the tip of the venous lumen, and the dialyzed blood is then returned to the patient through the tip of the arterial lumen, thus completing the dialysis procedure.

[0004] Currently, hemodialysis catheters are classified into four types based on the shape of their tip opening: conical hemodialysis catheters, step-type hemodialysis catheters, bifurcated hemodialysis catheters, and symmetrical spiral hemodialysis catheters. Among these, Figure 1 It is a cone-shaped hemodialysis catheter. Figure 2 This diagram illustrates the blood flow when the conical hemodialysis catheter is in the correct connection position and located within blood vessel 2. It shows that the blood flowing into the arterial lumen 100 and the blood flowing out of the venous lumen 200 flow independently and do not affect each other. Figure 3 This diagram illustrates the blood flow when the conical hemodialysis catheter is in reverse connection mode. It shows that after dialysis, the blood flowing out of the arterial lumen 100 may flow back into the venous lumen 200, causing this portion of blood to be redialyzed, resulting in a significant decrease in dialysis efficiency.

[0005] Figure 4 It is a step-down hemodialysis catheter. Figure 5 These are bifurcated hemodialysis catheters. The two types of catheters have similar shapes, therefore both types are... Figure 6 and Figure 7 As a diagram illustrating positive and negative polarity, combined with Figure 6As shown, when the stepped hemodialysis catheter and the bifurcated hemodialysis catheter are in the correct connection state and located within the blood vessel, the blood flowing into the arterial lumen 100 and the blood flowing out of the venous lumen 200 can flow independently. Combined with... Figure 7 As shown, when the stepped hemodialysis catheter and the bifurcated hemodialysis catheter are in the reverse connection state, there is a possibility that the blood after dialysis flows out of the arterial lumen 100 and then flows back into the venous lumen 200, which also leads to a decrease in dialysis efficiency.

[0006] Figure 8 and Figure 9 This is a schematic diagram of a symmetrical spiral hemodialysis catheter. Figure 10 and Figure 11 As shown, regardless of whether the catheter is connected correctly or incorrectly, there is no phenomenon of dialysis blood re-entering the hemodialysis catheter for re-dialysis. While ensuring dialysis efficiency, this also... Figure 9 As shown, the tip edge of the symmetrical spiral hemodialysis catheter is irregular, meaning that the arc 300 at the tip opening of this type of catheter cannot be easily cut with a cutting tool. Therefore, this type of hemodialysis catheter has high material requirements and can only be made of rigid materials, such as polyurethane. Due to the strictness of the material, not only is the manufacturing difficulty of the symmetrical spiral hemodialysis catheter increased, but the rigid material also reduces the adaptability of the hemodialysis catheter to tortuous blood vessels, resulting in reduced patient comfort. Utility Model Content

[0007] In view of this, the present invention provides a dialysis catheter and dialysis system to solve the problem that when existing conical, stepped, and bifurcated hemodialysis catheters are reversed, dialysis blood flowing out of the arterial lumen may flow back into the venous lumen, causing this portion of blood to be redialyzed, resulting in a significant decrease in dialysis efficiency. The symmetrical spiral hemodialysis catheter, regardless of whether it is connected correctly or incorrectly, does not exhibit this phenomenon of dialysis blood re-entering the catheter for redialysis. While ensuring dialysis efficiency, the tip edge of the symmetrical spiral hemodialysis catheter is irregularly shaped; that is, the arc at the tip opening of this type of catheter cannot be easily cut with a cutting tool. Therefore, this type of hemodialysis catheter has high material requirements and can only be made of rigid materials, such as polyurethane. Due to the stringent requirements of the material, not only is the manufacturing difficulty of the symmetrical spiral hemodialysis catheter increased, but the rigidity of the material also reduces the adaptability of the hemodialysis catheter to tortuous blood vessels, leading to a decrease in patient comfort.

[0008] In a first aspect, this utility model provides a dialysis catheter, comprising:

[0009] The catheter body has a first lumen and a second lumen, which are spaced apart along the radial direction of the catheter body. The distal openings of the first lumen and the second lumen are located on the same end face of the catheter body. The first lumen and the second lumen are used to connect to a dialysis device, such that one of the first lumen and the second lumen draws fluid from the treatment site into the dialysis device, and the fluid processed by the dialysis device is returned to the treatment site through the other of the first lumen and the second lumen. The distal opening trajectories of the first lumen and the second lumen are symmetrical with respect to the axis of the catheter body. The first lumen and the second lumen are arranged to extend along the axial direction of the catheter body. A cross-section is made along the axial direction of the catheter body. The distal opening of the first lumen is a first curve, and the distal opening of the second lumen is a second curve. The first curve is concave in the direction towards the first lumen, and the second curve is concave in the direction towards the second lumen. The gap between the first lumen and the second lumen is a gap portion. Both the first curve and the second curve are tangent to the gap portion, and the distal end of the gap portion extends beyond the connection position between the first curve and the gap portion. The distal end of the gap portion also extends beyond the connection position between the second curve and the gap portion.

[0010] Beneficial effects: By defining the first lumen and the second lumen on the catheter body, and setting the distal opening trajectory of the first lumen and the distal opening trajectory of the second lumen symmetrically with respect to the axis of the catheter body, the dialysis catheter of this invention can be manufactured by simple cutting. That is, the dialysis catheter of this invention can use both soft and hard materials, reducing the material limitations of the dialysis catheter of this invention, thereby achieving the technical effect of reducing the difficulty of manufacturing the dialysis catheter.

[0011] Meanwhile, by making a cross-section along the axial direction of the catheter body, the distal opening of the first lumen is set as a first curve, and the distal opening of the second lumen is set as a second curve. The first curve is concave in the direction of the first lumen, and the second curve is concave in the direction of the second lumen. The gap between the first lumen and the second lumen is set as a gap. The distal end of the gap extends beyond the connection position between the first curve and the gap. The distal end of the gap extends beyond the connection position between the second curve and the gap. Both the first curve and the second curve are tangent to the gap.

[0012] Based on this, along the axial direction of the catheter body, compared to other positions on the first curve, the endpoint furthest from the interval on the first curve is closest to the dialysis device, meaning that the attraction force is greatest at this endpoint. Furthermore, on the first curve, the attraction force gradually decreases towards the interval from this endpoint until it can no longer attract the liquid. This avoids the situation in related technologies where the liquid from the completed dialysis is mixed into the liquid to be dialyzed, thus reducing dialysis efficiency. This achieves the technical effect of improving the dialysis efficiency of the dialysis catheter in this invention.

[0013] In one optional embodiment, the distance between the connection point of the interval and the first curve and the distal end of the interval is not less than 2 mm;

[0014] And / or, the distance between the connection point of the interval and the second curve and the distal end of the interval is not less than 2 mm.

[0015] Beneficial effects: By limiting the size of the interval, the technical effect of improving the reliability of the separation between the first lumen and the second lumen can be achieved, thereby achieving the technical effect of avoiding the reliability of repeated hemodialysis.

[0016] In one optional implementation, the first curve and / or the second curve are both arcs with a fixed radius, wherein the radius of the first curve is set to R1 and the radius of the second curve is set to R2.

[0017] In one optional embodiment, a cross-section is made along the direction perpendicular to the axis of the catheter body. The cross-section of the catheter body is circular, and the radius of the catheter body is set to R. The radius of the first curve R1≥1 / 2R, and the radius of the second curve R2≥1 / 2R.

[0018] Alternatively, a cross-section can be made along the axis perpendicular to the catheter body, the cross-section of the catheter body being elliptical, the major axis of the catheter body being L, the radius of the first curve being R1≥1 / 2L, and the radius of the second curve being R2≥1 / 2L.

[0019] In one alternative implementation, the radius R1 of the first curve is equal to the radius R2 of the second curve.

[0020] Beneficial effect: By limiting the radius R1 of the first curve to be equal to the radius R2 of the second curve, the cutting tool used to process the first curve can be shared with the cutting tool used to process the second curve during the manufacturing of dialysis catheters, eliminating the need for additional cutting tool design. This significantly improves the ease of dialysis catheter fabrication.

[0021] In one alternative embodiment, the distal opening trajectory of the first lumen and the distal opening trajectory of the second lumen are symmetrically arranged with respect to the spacer.

[0022] In one optional embodiment, a cross-section is taken along the axial direction of the catheter body, and the length L1 of the distal opening of the first lumen along the axial direction parallel to the catheter body is equal to the length L2 of the distal opening of the second lumen along the axial direction parallel to the catheter body.

[0023] In one alternative embodiment, the catheter body is made of silicone and / or polyurethane.

[0024] In one alternative embodiment, the dialysis catheter includes:

[0025] The connecting unit is provided with a first connecting channel and a second connecting channel, the first connecting channel and the second connecting channel are spaced apart, and the connecting unit is connected to the catheter body so that the first connecting channel communicates with the first lumen and the second connecting channel communicates with the second lumen;

[0026] The first pipe has one end connected to the first connecting channel, and the other end of the first pipe is used to connect to the dialysis device.

[0027] The second pipe has one end connected to the second connecting channel, and the other end of the second pipe is used to connect to the dialysis device.

[0028] Secondly, this utility model also provides a dialysis system, comprising:

[0029] The dialysis catheter in this embodiment;

[0030] The dialysis apparatus is connected to both the first and second conduits.

[0031] Beneficial effects: Since the dialysis system includes a dialysis device, it has the same effects as the dialysis device, which will not be elaborated here. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a cone-shaped dialysis catheter in related technologies;

[0034] Figure 2 This is a schematic diagram of the blood flow direction when a tapered vascular dialysis catheter is properly connected in a related technology.

[0035] Figure 3 This is a schematic diagram of the blood flow direction when the tapered dialysis catheter is reversed in a related technology.

[0036] Figure 4 This is a schematic diagram of the structure of a stepped vascular dialysis catheter in related technologies;

[0037] Figure 5 This is a schematic diagram of the structure of a bifurcated vascular dialysis catheter in related technologies;

[0038] Figure 6 This is a schematic diagram of the blood flow direction when the stepped vascular dialysis catheter and the bifurcation vascular dialysis catheter are connected in the relevant technology;

[0039] Figure 7 This is a schematic diagram of the blood flow direction when the stepped vascular dialysis catheter and the bifurcation vascular dialysis catheter are reversed in the relevant technology.

[0040] Figure 8 This is a schematic diagram of the structure of a symmetrical spiral vascular dialysis catheter in related technologies;

[0041] Figure 9 This is a schematic diagram of the tip opening structure of a symmetrical spiral vascular dialysis catheter in related technologies;

[0042] Figure 10 This is a schematic diagram of the blood flow direction when a symmetrical spiral vascular dialysis catheter is connected in the correct orientation in related technologies.

[0043] Figure 11 This is a schematic diagram of the blood flow direction when a symmetrical spiral vascular dialysis catheter is reversed in a related technology.

[0044] Figure 12 This is a schematic diagram of the dialysis catheter in this embodiment;

[0045] Figure 13 This is a cross-sectional view of the catheter body cut along a direction parallel to the axis of the dialysis catheter in this embodiment;

[0046] Figure 14 This is a cross-sectional view of the catheter body cut along a direction perpendicular to the axis of the dialysis catheter in this embodiment;

[0047] Figure 15 This is a cross-sectional view of the catheter body cut along a direction perpendicular to the axis of the dialysis catheter in other embodiments;

[0048] Figure 16 This is a schematic diagram showing the blood flow direction when the dialysis catheter of this invention is connected in the correct position.

[0049] Figure 17This is a schematic diagram showing the blood flow direction when the dialysis catheter of this invention is reversed.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Catheter body; 101. First lumen; 102. Second lumen; 103. Spacing;

[0052] 104. First curve; 1041. Endpoint;

[0053] 105. The second curve;

[0054] 2. Blood vessel; 3. Connecting unit; 4. First pipe; 5. Second pipe; 6. First switching valve; 7. Second switching valve;

[0055] 100. Arterial lumen; 200. Venous lumen; 300. Arc. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0057] The following is combined Figures 12 to 17 The following describes embodiments of the present invention.

[0058] According to an embodiment of the present invention, in one aspect, a dialysis catheter is provided, comprising:

[0059] The catheter body 1 has a first lumen 101 and a second lumen 102, which are spaced apart along the radial direction of the catheter body 1. The distal openings of the first lumen 101 and the second lumen 102 are located on the same end face of the catheter body 1. The first lumen 101 and the second lumen 102 are used to connect to a dialysis device, such that one of the first lumen 101 and the second lumen 102 draws the fluid in the treatment area into the dialysis device, and the fluid processed by the dialysis device returns to the treatment area through the other of the first lumen 101 and the second lumen 102. The distal opening trajectories of the first lumen 101 and the second lumen 102 are symmetrically arranged with respect to the axis of the catheter body 1. The extension direction of the first lumen 101 and the second lumen 102 is set along the axial direction of the catheter body 1. A cross-section is made along the axial direction of the catheter body 1. The distal opening of the first lumen 101 is set as the first curve 104, and the distal opening of the second lumen 102 is set as the second curve 105. The first curve 104 is concave in the direction towards the first lumen 101, and the second curve 105 is concave in the direction towards the second lumen 102. The interval between the first lumen 101 and the second lumen 102 is set as the interval 103. The first curve 104 and the second curve 105 are both tangent to the interval 103, and the distal end of the interval 103 extends beyond the connection position between the first curve 104 and the interval 103. The distal end of the interval 103 also extends beyond the connection position between the second curve 105 and the interval 103.

[0060] In the dialysis catheter of this embodiment, by defining a first lumen 101 and a second lumen 102 on the catheter body 1, and the distal opening trajectory of the first lumen 101 and the distal opening trajectory of the second lumen 102 are respectively symmetrically arranged with respect to the axis of the catheter body 1, the dialysis catheter of this embodiment can be manufactured by simple cutting. That is, the dialysis catheter of this embodiment can use both soft and hard materials, reducing the material restrictions on the dialysis catheter of this embodiment, thereby achieving the technical effect of reducing the difficulty of manufacturing the dialysis catheter.

[0061] Meanwhile, by making a cross-section along the axial direction of the catheter body 1, the distal opening of the first lumen 101 is set as the first curve 104, and the distal opening of the second lumen 102 is set as the second curve 105. The first curve 104 is concave in the direction of the first lumen 101, and the second curve 105 is concave in the direction of the second lumen 102. The interval between the first lumen 101 and the second lumen 102 is set as the interval 103. The distal end of the interval 103 extends beyond the connection position between the first curve 104 and the interval 103. The distal end of the interval 103 extends beyond the connection position between the second curve 105 and the interval 103. The first curve 104 and the second curve 105 are both tangent to the interval 103.

[0062] Based on this, along the axial direction of the catheter body 1, compared to other positions on the first curve 104, the distance between the endpoint 1041, which is furthest from the interval 103, and the dialysis device is the shortest. That is, the attraction force is strongest at this endpoint 1041. Furthermore, along the first curve 104, the attraction force gradually decreases towards the interval 103 from this endpoint 1041 until it can no longer attract liquid. This avoids the situation in related technologies where the dialysis fluid has been mixed with the fluid to be dialyzed, thus reducing dialysis efficiency. Therefore, this achieves the technical effect of improving the dialysis efficiency of the dialysis catheter in this embodiment. The second curve 105 is set in the same principle as the first curve 104, and will not be described in detail here.

[0063] Among them, combined Figure 16 and Figure 17 As shown, the first lumen 101 is an arterial lumen 100, and the second lumen 102 is a venous lumen 200. The site to be treated is a blood vessel, and the fluid is the patient's blood. When the catheter body 1 is connected to the dialysis device in the correct orientation, the first lumen 101 draws the patient's blood into the dialysis device. After dialysis, the blood returns to the patient's body through the second lumen 102. When the catheter body 1 is connected to the dialysis device in the reverse orientation, the second lumen 102 draws the patient's blood into the dialysis device. After dialysis, the blood returns to the patient's body through the first lumen 101.

[0064] Alternatively, the first lumen 101 may be a venous lumen 200, and the second lumen 102 may be an arterial lumen 100.

[0065] In other embodiments, the location of the treatment site and the type of liquid are adjusted according to the different usage scenarios of the dialysis catheter.

[0066] In addition, "proximal" and "distal" refer to the relative orientation, position, and direction of the components or movements relative to each other from the perspective of the doctor using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" usually refers to the end of the medical device that is closer to the doctor during normal operation, while "distal" usually refers to the end that first enters the patient's body.

[0067] In this embodiment, the catheter body 1 is made of silicone. This improves the biocompatibility of the catheter body 1, thereby enhancing patient protection. Simultaneously, the catheter body 1 can bend along the patient's tortuous blood vessels 2 without causing discomfort, thus improving patient comfort.

[0068] Of course, in other embodiments, depending on the design of the dialysis catheter, the material of the catheter body 1 may be adjusted, and it may be made of polyurethane material alone, or a combination of silicone and polyurethane materials, or other medical materials. All of these are within the protection scope of this utility model.

[0069] Preferably, the distance between the connection point of the spacer 103 and the first curve 104 and the distal end of the spacer 103 is D1, where D1 equals 2 mm. Simultaneously, the distance between the connection point of the spacer 103 and the second curve 105 and the distal end of the spacer 103 is D2, where D2 equals 2 mm.

[0070] Based on this, the septum 103 can separate the first lumen 101 and the second lumen 102 to avoid repeated dialysis of blood, and can also prevent the dialysis catheter from being too long and causing harm to the patient, thereby achieving the technical effect of improving the reliability of dialysis catheter use.

[0071] As an alternative implementation, it is also possible to limit the distance between the connection point of the interval 103 and the first curve 104 and the distal end of the interval 103 to be no less than 2 mm. Alternatively, it is possible to limit the distance between the connection point of the interval 103 and the second curve 105 and the distal end of the interval 103 to be no less than 2 mm, both of which are within the protection scope of this utility model.

[0072] Of course, in other embodiments, the lengths of D1 and D2 may be adjusted according to the design of the dialysis catheter, as long as they are not shorter than 2 mm, they are all within the protection scope of this utility model.

[0073] In addition, combined Figure 13 As shown, in this embodiment, both the first curve 104 and the second curve 105 are arcs with a fixed radius. The radius of the first curve 104 is set to R1, and the radius of the second curve 105 is set to R2.

[0074] Preferably, the radius R1 of the first curve 104 is equal to the radius R2 of the second curve 105. Based on this, during the manufacturing of the dialysis catheter, the cutting tool used to process the first curve 104 can be shared with the cutting tool used to process the second curve 105, eliminating the need for additional cutting tool design, thereby improving the ease of dialysis catheter manufacturing.

[0075] Further, preferably, when a cross-section is made along the axial direction of the catheter body 1, the length L1 of the distal opening of the first lumen 101 along the axial direction parallel to the catheter body 1 is equal to the length L2 of the distal opening of the second lumen 102 along the axial direction parallel to the catheter body 1.

[0076] Furthermore, preferably, the distal opening trajectory of the first lumen 101 and the distal opening trajectory of the second lumen 102 are symmetrically arranged with respect to the spacer 103. That is, the arc length of the distal opening trajectory of the first lumen 101 is equal to the arc length of the distal opening trajectory of the second lumen 102.

[0077] Of course, in other embodiments, depending on the design of the dialysis catheter, the distal opening trajectory of the first lumen 101 and the distal opening trajectory of the second lumen 102 are not symmetrically arranged relative to the spacer 103. In this case, it is necessary to design the distal opening with the longest trajectory among the distal opening trajectories of the first lumen 101 and the second lumen 102 as a cutting blade. When this cutting blade is used to cut the distal opening with the shortest trajectory, two marks are made on the cutting blade so that the arc of the cutting blade between the two marks matches the trajectory of the shortest distal opening. Compared with other embodiments, this embodiment does not require the design of two marks, thereby achieving the technical effect of improving the simplicity of dialysis catheter fabrication.

[0078] As an alternative implementation, only the first curve 104 can be an arc with a fixed radius, and only the second curve 105 can be an arc with a fixed radius; both are within the protection scope of this utility model.

[0079] In other embodiments, depending on the design of the dialysis catheter, the first curve 104 and the second curve 105 can be formed by splicing together multiple arcs with different radii. Compared to other embodiments, the radii of the first curve 104 and the second curve 105 in this embodiment are constant, resulting in a simple structure and thus achieving the technical effect of improving the ease of manufacturing the dialysis catheter.

[0080] As an alternative implementation, the radius R1 of the first curve 104 may not be equal to the radius R2 of the second curve 105.

[0081] In other embodiments, depending on the design of the dialysis catheter, a cross-section is made along the axial direction of the catheter body 1. The length L1 of the distal opening of the first lumen 101 along the axial direction parallel to the catheter body 1 is not equal to the length L2 of the distal opening of the second lumen 102 along the axial direction parallel to the catheter body 1. Both are within the protection scope of this utility model.

[0082] In addition, combined Figure 14 As shown, in this embodiment, a cross-section is made along the direction perpendicular to the axis of the catheter body 1. The cross-section of the catheter body 1 is circular, and the radius of the catheter body 1 is set as R. The radius of the first curve 104 is R1 = 1 / 2R, and the radius of the second curve 105 is R2 = 1 / 2R.

[0083] Based on this, the distal opening trajectory of the first lumen 101 and the distal opening trajectory of the second lumen 102 are not too short, which would cause the septum 103 to be too thick, affecting the blood flow efficiency and thus affecting the dialysis efficiency of the dialysis catheter, thereby achieving the technical effect of improving the reliability of the dialysis catheter.

[0084] As an alternative implementation, the radius R1 of the first curve 104 may be greater than 1 / 2R, and the radius R2 of the second curve 105 may be greater than 1 / 2R, both of which are within the protection scope of this utility model.

[0085] Of course, in other embodiments, combined Figure 15 As shown, depending on the design of the dialysis catheter, the cross-sectional shape of the catheter body 1 is adjusted. A cross-section is made along the direction perpendicular to the axis of the catheter body 1. The cross-section of the catheter body 1 is elliptical, and the major diameter of the catheter body 1 is L. The radius R1 of the first curve 104 is ≥1 / 2L, and the radius R2 of the second curve 105 is ≥1 / 2L. This can also achieve the technical effect of improving the dialysis efficiency of the dialysis catheter.

[0086] As an alternative implementation, the length L1 of the distal opening of the first lumen 101 along the axial direction of the catheter body 1 is not equal to the length L2 of the distal opening of the second lumen 102 along the axial direction of the catheter body 1.

[0087] Combination Figure 12 As shown, in this embodiment, the dialysis catheter includes:

[0088] The connecting unit 3 is provided with a first connecting channel and a second connecting channel, which are spaced apart. The connecting unit 3 is connected to the catheter body 1 so that the first connecting channel communicates with the first lumen 101 and the second connecting channel communicates with the second lumen 102.

[0089] The first pipe 4 has one end connected to the first connecting channel and the other end of the first pipe 4 is used to connect to the dialysis device.

[0090] The second pipe 5 has one end connected to the second connecting channel and the other end connected to the dialysis device.

[0091] By setting the connection unit 3, the first pipe 4 and the conduit body 1 are connected, as are the second pipe 5 and the conduit body 1.

[0092] Preferably, the connecting unit 3 is integrally connected to the first pipe 4, the connecting unit 3 is integrally connected to the second pipe 5, and the connecting unit is integrally connected to the catheter body 1. Based on this, the technical effect of improving the reliability of the connection positions between the connecting unit 3 and the first pipe 4, the connecting unit 3 and the second pipe 5, and the connecting unit 3 and the catheter body 1 can be achieved.

[0093] As an alternative implementation, the connecting unit 3 may be detachably connected to the first pipe 4, the connecting unit 3 to the second pipe 5, and the connecting unit 3 to the conduit body 1; or the connecting unit 3 may be fixedly connected to the first pipe 4, the connecting unit 3 to the second pipe 5, and the connecting unit 3 to the conduit body 1. All of these are within the protection scope of this utility model.

[0094] Preferably, the other end of the first pipe 4 and the other end of the second pipe 5 are provided with joints, such as Luer joints. Based on this, the technical effect of improving the reliability of the connection between the first pipe 4 and the dialysis device, and between the second pipe 5 and the dialysis device, can be achieved.

[0095] Of course, in other embodiments, depending on the design of the dialysis catheter, the other end of the first conduit 4 is connected to the dialysis device, and the other end of the second conduit 5 is connected to the dialysis device by insertion. All of these are within the protection scope of this utility model.

[0096] In addition, preferably, the first pipe 4 is provided with a first switch valve 6 and the second pipe 5 is provided with a second switch valve 7. For example, both the first switch valve 6 and the second switch valve 7 are flow stop clamps, which can adjust the opening and closing of the first pipe 4 and the second pipe 5 according to actual needs.

[0097] Alternatively, one of the first pipe 4 and the second pipe 5 may be equipped with a flow stop clamp.

[0098] Of course, in other embodiments, the types of the first switching valve 6 and the second switching valve 7 may be adjusted depending on the design of the dialysis catheter.

[0099] In other embodiments, depending on the design of the dialysis catheter, neither the first conduit 4 nor the second conduit 5 is equipped with a flow stop clamp.

[0100] According to an embodiment of the present invention, another aspect provides a hemodialysis system, comprising:

[0101] The dialysis catheter in this embodiment;

[0102] The dialysis device is connected to both the first pipe 4 and the second pipe 5. The dialysis device is a dialyzer.

[0103] The dialysis device allows fluid from the patient's body to enter the dialysis device through the catheter body 1. After dialysis is completed, the dialysis device drives the fluid back into the patient's body, thus completing the dialysis process.

[0104] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dialysis catheter characterized by, include: The catheter body (1) has a first lumen (101) and a second lumen (102). The first lumen (101) and the second lumen (102) are spaced apart along the radial direction of the catheter body (1). The distal openings of the first lumen (101) and the second lumen (102) are located on the same end face of the catheter body (1). The first lumen (101) and the second lumen (102) are used to connect to a dialysis device, such that one of the first lumen (101) and the second lumen (102) draws the liquid in the treatment area into the dialysis device, so that the liquid treated by the dialysis device returns to the treatment area through the other of the first lumen (101) and the second lumen (102). The distal opening trajectories of the first lumen (101) and the second lumen (102) are respectively symmetrically arranged with respect to the axis of the catheter body (1). The extension direction of the second lumen (102) is set along the axial direction of the catheter body (1). A cross-section is made along the axial direction of the catheter body (1). The distal opening of the first lumen (101) is set as a first curve (104), and the distal opening of the second lumen (102) is set as a second curve (105). The first curve (104) is concave inward toward the first lumen (101), and the second curve (105) is concave inward toward the second lumen (102). The interval between the first lumen (101) and the second lumen (102) is set as a spacer (103). The first curve (104) and the second curve (105) are both tangent to the spacer (103), and the distal end of the spacer (103) extends beyond the connection position between the first curve (104) and the spacer (103). The distal end of the spacer (103) also extends beyond the connection position between the second curve (105) and the spacer (103).

2. The dialysis catheter of claim 1, wherein, The distance between the connection point of the interval (103) and the first curve (104) and the far end of the interval (103) is not less than 2 mm; And / or, the distance between the connection point of the interval (103) and the second curve (105) and the far end of the interval (103) is not less than 2 mm.

3. The dialysis catheter of claim 1, wherein, The first curve (104) and / or the second curve (105) are both arcs with a fixed radius. The radius of the first curve (104) is set to R1, and the radius of the second curve (105) is set to R2.

4. The dialysis catheter of claim 3, wherein, A cross section is made along the direction perpendicular to the axis of the catheter body (1). The cross section of the catheter body (1) is circular. The radius of the catheter body (1) is set as R. The radius of the first curve (104) is R1≥1 / 2R, and the radius of the second curve (105) is R2≥1 / 2R. Alternatively, a cross-section can be made along the direction perpendicular to the axis of the catheter body (1), the cross-section of the catheter body (1) is elliptical, the major axis of the catheter body (1) is L, the radius R1 of the first curve (104) is ≥1 / 2L, and the radius R2 of the second curve (105) is ≥1 / 2L.

5. The dialysis catheter of claim 3, wherein, The radius R1 of the first curve (104) is equal to the radius R2 of the second curve (105).

6. The dialysis catheter of any of claims 1-5, wherein, The distal opening trajectory of the first lumen (101) and the distal opening trajectory of the second lumen (102) are symmetrically arranged with respect to the spacer (103).

7. The dialysis catheter of any of claims 1-5, wherein, A cross-section is taken along the axial direction of the catheter body (1). The length L1 of the distal opening of the first lumen (101) along the axial direction of the catheter body (1) is equal to the length L2 of the distal opening of the second lumen (102) along the axial direction of the catheter body (1).

8. The dialysis catheter of any of claims 1-5, wherein, The catheter body (1) is made of silicone and / or polyurethane.

9. The dialysis catheter of any of claims 1-5, wherein, The dialysis catheter includes: The connecting unit (3) is provided with a first connecting channel and a second connecting channel, the first connecting channel and the second connecting channel are spaced apart, the connecting unit (3) is connected to the catheter body (1) so that the first connecting channel communicates with the first lumen (101) and the second connecting channel communicates with the second lumen (102); The first pipe (4) has one end connected to the first connecting channel and the other end of the first pipe (4) is used to connect to the dialysis device. The second pipe (5) is connected at one end to the second connecting channel, and at the other end to the dialysis device.

10. A dialysis system characterized by, include: The dialysis catheter according to any one of claims 1 to 9; The dialysis device is connected to both the first conduit (4) and the second conduit (5).

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