Blood purification catheter

Abstract

The utility model particularly discloses a blood purification catheter, relates to medical instrument technical field, blood purification catheter includes tube body, first tip valve, second tip valve, partition plate, first sidewall valve and second sidewall valve, when the first chamber is negative pressure, first sidewall valve opens first sidewall open pore, first tip valve clings to partition plate, and second tip valve clings to partition plate. When the pressure in the first cavity is positive, the first side wall valve closes the first side wall opening, and the first tip valve is separated from the partition plate, so that the first cavity is communicated with the outside; when negative pressure exists in the second cavity, the second side wall valve opens the second side wall opening hole, and the second tip valve is tightly attached to the partition plate, and when positive pressure exists in the second cavity, the second side wall valve closes the second side wall opening hole, and the second tip valve is separated from the partition plate, so that the second cavity is communicated with the outside. In blood purification treatment, recirculation is avoided when the pipeline is reversely connected, and the blood purification efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a blood purification catheter. Background Art

[0002] Blood purification catheter is an important tool used in blood purification treatment. Its main function is to provide a safe and effective extracorporeal circulation channel for blood purification. However, in clinical practice, blood is often not drawn out smoothly because the catheter is close to the blood vessel wall, thrombus covers the opening, etc. At this time, the usual practice is to reverse the catheter so that the original blood return cavity is used to draw out blood and the original blood drainage cavity is used to return blood, thereby ensuring smooth blood flow.

[0003] However, due to the location of the openings of the two chambers, reverse connection will cause the purified blood to flow into the blood vessels through the original blood inlet cavity opening, bypass the systemic circulation and be directly sucked into the original blood return cavity for purification again. This phenomenon is called recirculation. Recirculation reduces the efficiency of blood purification and may have adverse effects on the patient's health. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a blood purification catheter, which does not cause recirculation when the pipeline is reversed during blood purification treatment, and has high blood purification efficiency.

[0005] According to an embodiment of the utility model, a blood purification catheter comprises a tube body, a first tip valve, a second tip valve, a partition, a first side wall valve and a second side wall valve, wherein the first tip valve is installed at one end of the tube body; the second tip valve is installed at the same end of the tube body; the partition is arranged in the tube body along the axial direction of the tube body, the inner wall of the tube body, the partition and the first tip valve define a first chamber, the inner wall of the tube body, the partition and the second tip valve define a second chamber, the tube body is provided with a first side wall opening and a second side wall opening respectively connecting the first chamber and the second chamber; the first side wall valve is installed in the first side wall opening; the second The second side wall valve is installed on the second side wall opening; when the first chamber is under negative pressure, the first side wall valve opens the first side wall opening, and the first tip valve is tightly against the partition; when the first chamber is under positive pressure, the first side wall valve closes the first side wall opening, and the first tip valve is separated from the partition to connect the first chamber with the outside; when the second chamber is under negative pressure, the second side wall valve opens the second side wall opening, and the second tip valve is tightly against the partition; when the second chamber is under positive pressure, the second side wall valve closes the second side wall opening, and the second tip valve is separated from the partition to connect the second chamber with the outside.

[0006] The blood purification catheter according to the embodiment of the present utility model has at least the following beneficial effects: In blood purification treatment, assuming that the first chamber is used as the blood-drawing chamber, at this time, the inside of the first chamber is under negative pressure, the first sidewall valve opens the first sidewall opening, and the first tip valve clings to the partition to draw blood; the second chamber is used as the blood-returning chamber, at this time, the inside of the second chamber is under positive pressure, the second sidewall valve closes the second sidewall opening, and the second tip valve separates from the partition to connect the second chamber with the outside. At this time, the purified blood is transfused back into the blood vessel through the gap generated by the separation of the second tip valve from the partition. If the pipeline is reversely connected, the positive and negative pressures in the first chamber and the second chamber are interchanged. The inside of the second chamber is under negative pressure, the second sidewall valve opens the second sidewall opening, the first tip valve clings to the partition to draw blood; the inside of the first chamber is under positive pressure, the first sidewall valve closes the first sidewall opening, and the first tip valve separates from the partition to connect the first chamber with the outside. At this time, the purified blood is transfused back into the blood vessel through the gap generated by the separation of the first tip valve from the partition. That is, regardless of whether the pipeline is reversely connected or not, the blood-drawing position is the sidewall opening, and the blood-transfusion position is the gap generated by the separation of the tip valve from the partition. Since the first tip valve and the second tip valve are installed at the same end of the tube body, the first sidewall opening and the second sidewall opening are both provided on the sidewall of the tube body, and in actual use, the direction along the tube body to the two tip valves is the blood flow direction in the blood vessel. Therefore, along the blood flow direction, the sidewall opening is always in front, and the gap generated by the separation of the tip valve from the partition is behind. That is, in blood purification treatment, regardless of whether the pipeline is reversely connected or not, along the blood flow direction, blood is always drawn first and then transfused, and recirculation will not occur, and the blood purification efficiency is high.

[0007] According to an embodiment of the present utility model, two first sidewall openings are provided, and the two first sidewall openings are arranged at intervals along the circumferential direction of the tube body.

[0008] According to an embodiment of the present utility model, the two first sidewall openings are respectively arranged close to the two side edges of the partition.

[0009] According to an embodiment of the present utility model, two second sidewall openings are provided, and the two second sidewall openings are arranged at intervals along the circumferential direction of the tube body.

[0010] According to an embodiment of the present utility model, the two second sidewall openings are respectively arranged close to the two side edges of the partition.

[0011] According to an embodiment of the present utility model, the distance from the end of the first tip valve away from the tube body to the first sidewall opening is d1, and the distance from the end of the second tip valve away from the tube body to the second sidewall opening is d2, satisfying: d1 and d2 are not equal.

[0012] According to an embodiment of the present utility model, the distance d1 from the end of the first tip valve away from the tube body to the opening on the first side wall and the distance d2 from the end of the second tip valve away from the tube body to the opening on the second side wall are both greater than 3 cm.

[0013] According to an embodiment of the present utility model, both the first tip valve and the second tip valve are made of medical silicone material.

[0014] According to an embodiment of the present utility model, both the first side wall valve and the second side wall valve are made of medical silicone material.

[0015] According to an embodiment of the present utility model, a guide hole is provided at the end of the first tip valve away from the tube body or the end of the second tip valve away from the tube body.

[0016] The additional aspects and advantages of the present utility model will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0017] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0018] Figure 1 is a longitudinal sectional view of a blood purification catheter according to an embodiment of the present utility model;

[0019] Figure 2 is an exploded view of a blood purification catheter according to an embodiment of the present utility model;

[0020] Figure 3 is a schematic view of a blood purification catheter according to an embodiment of the present utility model;

[0021] Figure 4 is a schematic view of a blood purification catheter according to an embodiment of the present utility model from another angle;

[0022] Figure 5 is a cross-sectional view of a blood purification catheter according to an embodiment of the present utility model placed in a blood vessel.

[0023] Reference Signs:

[0024] Blood purification catheter 1000;

[0025] Tube body 100; First side wall opening 110; Second side wall opening 120;

[0026] First tip valve 200;

[0027] Second tip valve 300;

[0028] Partition 400; main board portion 410; extension portion 420;

[0029] A first side wall valve 500;

[0030] Second side wall valve 600;

[0031] First chamber 700;

[0032] Second chamber 800;

[0033] Vascular 2000. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] Blood purification catheter is an important tool used in blood purification treatment. Its main function is to provide a safe and effective extracorporeal circulation channel for blood purification. However, in clinical practice, blood is often not drawn out smoothly because the catheter is close to the blood vessel wall, thrombus covers the opening, etc. At this time, the usual practice is to reverse the catheter so that the original blood return cavity is used to draw out blood and the original blood drainage cavity is used to return blood, thereby ensuring smooth blood flow.

[0039] However, due to the opening positions of the two chambers, if it is connected reversely, the purified blood will flow into the blood vessel through the original blood-drawing chamber opening and then be directly sucked into the original blood-returning chamber, bypassing the systemic circulation and being purified again. This phenomenon is called recirculation. Recirculation reduces the blood purification efficiency and may have an adverse impact on the patient's health.

[0040] Therefore, the present utility model provides a blood purification catheter 1000, specifically as shown in the Figures 1 to 5 accompanying drawings of the specification.

[0041] Referring to Figure 1 and Figure 2 shown in the figures, a blood purification catheter 1000 according to an embodiment of the present utility model includes a tube body 100, a first tip valve 200, a second tip valve 300, a partition 400, a first sidewall valve 500, and a second sidewall valve 600. In one embodiment, the tube body 100 is made of polyurethane material and has an overall circular thin-walled tubular structure. It should be noted that the first tip valve 200 is installed at one end of the tube body 100, and the second tip valve 300 is installed at the same end of the tube body 100. That is, the first tip valve 200 and the second tip valve 300 are installed at the same end of the tube body 100. It should be noted that both the first tip valve 200 and the second tip valve 300 have a mounting portion and a working portion. Among them, the mounting portion is used to mount the first tip valve 200 and the second tip valve 300 at the end of the tube body 100 and is in the shape of a hollow semi-cylindrical; the working portion is used to participate in the blood purification process and is in the shape of a hollow semi-conical.

[0042] Referring to Figure 1 and Figure 2 shown in the figures, it should be noted that the partition 400 is disposed axially in the tube body 100 along the axis of the tube body 100. Among them, the inner wall of the tube body 100, the partition 400, and the first tip valve 200 define a first chamber 700, and the inner wall of the tube body 100, the partition 400, and the second tip valve 300 define a second chamber 800. Specifically referring to Figure 1 and Figure 2 shown in the figures, the partition 400 includes a main board portion 410 and an extension portion 420. In one embodiment, the main board portion 410 and the extension portion 420 are an integral member. It should be noted that the main board portion 410 is located inside the tube body 100, is connected to the inner wall of the tube body 100, and divides the inner cavity of the tube body 100 into a first inner cavity and a second inner cavity; the extension portion 420 extends outside the tube body 100 and defines a third inner cavity with the first tip valve 200 and a fourth inner cavity with the second tip valve 300. It should also be noted that the first inner cavity and the third inner cavity together form the first chamber 700, and the second inner cavity and the fourth inner cavity together form the second chamber 800.

[0043] Referring to Figure 1 and Figure 2As shown, it should be noted that the side wall of the tube body 100 is provided with a first side wall opening 110 and a second side wall opening 120 that are respectively communicated with the first chamber 700 and the second chamber 800. That is, the first chamber 700 is communicated with the outside through the first side wall opening 110, and the second chamber 800 is communicated with the outside through the second side wall opening 120. In addition, a first side wall valve 500 is installed at the first side wall opening 110, and a second side wall valve 600 is installed at the second side wall opening 120. In one embodiment, the first side wall opening 110 is oval, and the second side wall opening 120 is oval. It should be noted that the first side wall opening 110 and the second side wall opening 120 can also be other shapes, which are not specifically limited here. In one embodiment, the area of the first side wall opening 110 is more than half of the cross-sectional area of the first chamber 700; the area of the second side wall opening 120 is more than half of the cross-sectional area of the second chamber 800.

[0044] Referring to Figure 1 As shown, it should be noted that when the pressure in the first chamber 700 is negative, the first side wall valve 500 opens the first side wall opening 110, and the first tip valve 200 closely adheres to the partition plate 400. When the pressure in the first chamber 700 is positive, the first side wall valve 500 closes the first side wall opening 110, and the first tip valve 200 separates from the partition plate 400 to enable the first chamber 700 to communicate with the outside; when the pressure in the second chamber 800 is negative, the second side wall valve 600 opens the second side wall opening 120, and the second tip valve 300 closely adheres to the partition plate 400. When the pressure in the second chamber 800 is positive, the second side wall valve 600 closes the second side wall opening 120, and the second tip valve 300 separates from the partition plate 400 to enable the second chamber 800 to communicate with the outside. It should be noted that the gap generated after the first tip valve 200 separates from the partition plate 400 enables the first chamber 700 to communicate with the outside, and this gap is located at the end of the first tip valve 200 away from the tube body 100; the gap generated after the second tip valve 300 separates from the partition plate 400 enables the second chamber 800 to communicate with the outside, and this gap is located at the end of the second tip valve 300 away from the tube body 100.

[0045] Referring to Figure 1 As shown, it can be understood that in blood purification treatment, assuming that the first chamber 700 is used as the blood-drawing chamber, at this time the pressure in the first chamber 700 is negative, the first side wall valve 500 opens the first side wall opening 110, and the first tip valve 200 closely adheres to the partition plate 400 to draw blood; the second chamber 800 is used as the blood-returning chamber, at this time the pressure in the second chamber 800 is positive, the second side wall valve 600 closes the second side wall opening 120, and the second tip valve 300 separates from the partition plate 400 to enable the second chamber 800 to communicate with the outside. At this time, the purified blood is transfused back into the blood vessel 2000 through the gap generated by the separation of the second tip valve 300 from the partition plate 400.

[0046] In addition, if the pipeline is reversely connected, the positive and negative pressures in the first chamber 700 and the second chamber 800 are interchanged. The second chamber 800 is in negative pressure, the second sidewall valve 600 opens the second sidewall opening 120, and the second tip valve 300 clings to the partition plate 400 to draw out blood. The first chamber 700 is in positive pressure, the first sidewall valve 500 closes the first sidewall opening 110, and the first tip valve 200 separates from the partition plate 400 to communicate the first chamber 700 with the outside. At this time, the purified blood is transfused back into the blood vessel 2000 through the gap generated by the separation of the first tip valve 200 from the partition plate 400.

[0047] That is, regardless of whether the pipeline is reversely connected, the blood extraction position is the sidewall opening, and the blood transfusion position is the gap generated by the separation of the tip valve from the partition plate 400. Since the first tip valve 200 and the second tip valve 300 are installed at the same end of the pipe body 100, the first sidewall opening 110 and the second sidewall opening 120 are both provided on the sidewall of the pipe body 100, and in actual use, the direction along the pipe body 100 to the two tip valves is the blood flow direction in the blood vessel 2000. Therefore, along the blood flow direction, the sidewall opening is always in the front, and the gap generated by the separation of the tip valve from the partition plate 400 is in the back. That is, in blood purification treatment, regardless of whether the pipeline is reversely connected, along the blood flow direction, blood extraction is always carried out first, and then blood transfusion is carried out, and recirculation will not occur, and the blood purification efficiency is high. It should be noted that assuming that the second chamber 800 is used as the blood extraction chamber and the first chamber 700 is used as the blood return chamber, the corresponding description can be referred to the above, and will not be repeated here.

[0048] Refer to Figure 3 and Figure 4 As shown in

[0049] Refer to Figure 3 and Figure 4As shown, in one embodiment, the distance d1 from the end of the first tip valve 200 away from the tube body 100 to the first sidewall opening 110 and the distance d2 from the end of the second tip valve 300 away from the tube body 100 to the second sidewall opening 120 are both greater than 3 cm. It can be understood that, referring to the above, along the blood flow direction, the sidewall opening is always in the front, and the gap generated by the separation of the tip valve from the partition 400 is in the back. Blood is drawn out through the sidewall opening, and blood is transfused back through the gap generated by the separation of the tip valve from the partition 400. Therefore, through the above, the sidewall opening and the gap generated by the separation of the tip valve from the partition 400 will not be too close, further avoiding the occurrence of recirculation.

[0050] Referring to Figure 3 and Figure 5 As shown, for the blood purification catheter 1000 according to an embodiment of the present invention, two first sidewall openings 110 are provided, and the two first sidewall openings 110 are arranged at intervals along the circumferential direction of the tube body 100. It can be understood that through the above arrangement, when one of the first sidewall openings 110 is close to the wall of the blood vessel 2000 and causes poor blood flow through this first sidewall opening 110, the other first sidewall opening 110 will not be affected and can normally drain blood.

[0051] Continuing to refer to Figure 3 and Figure 5 As shown, in one embodiment, the two first sidewall openings 110 are respectively arranged close to the two side edges of the partition 400. It can be understood that through the above arrangement, the two first sidewall openings 110 are as far away from each other as possible. When one of the first sidewall openings 110 is close to the wall of the blood vessel 2000 and causes poor blood flow through this first sidewall opening 110, the other first sidewall opening 110 is less likely to be affected. At the same time, due to being arranged close to the side edges of the partition 400, the presence of the partition 400 reduces the influence of the opening on the strength of the tube body 100.

[0052] Referring to Figure 4 As shown, for the blood purification catheter 1000 according to an embodiment of the present invention, two second sidewall openings 120 are provided, and the two second sidewall openings 120 are arranged at intervals along the circumferential direction of the tube body 100. It can be understood that through the above arrangement, when one of the second sidewall openings 120 is close to the wall of the blood vessel 2000 and causes poor blood flow through this second sidewall opening 120, the other second sidewall opening 120 will not be affected and can normally drain blood.

[0053] Continuing to refer to Figure 4As shown, in one embodiment, the two second sidewall openings 120 are respectively disposed near the two side edges of the partition plate 400. It can be understood that through the above arrangement, the two second sidewall openings 120 are as far away from each other as possible. When one of the second sidewall openings 120 is close to the wall of the blood vessel 2000 and causes poor blood flow through the second sidewall opening 120, the other second sidewall opening 120 is less likely to be affected. At the same time, due to being disposed near the side edge of the partition plate 400, the presence of the partition plate 400 reduces the influence of the opening on the strength of the tube body 100.

[0054] For the blood purification catheter 1000 according to an embodiment of the present invention, both the first tip valve 200 and the second tip valve 300 are made of medical silicone material. That is, the first tip valve 200 is made of medical silicone material, and the second tip valve 300 is made of medical silicone material. It can be understood that the first tip valve 200 made of medical silicone material has elasticity and can better adhere to or separate from the extension portion 420 of the partition plate 400; the second tip valve 300 made of medical silicone material has elasticity and can better adhere to or separate from the extension portion 420 of the partition plate 400.

[0055] For the blood purification catheter 1000 according to an embodiment of the present invention, both the first sidewall valve 500 and the second sidewall valve 600 are made of medical silicone material. That is, the first sidewall valve 500 is made of medical silicone material, and the second sidewall valve 600 is made of medical silicone material. It can be understood that the first sidewall valve 500 made of medical silicone material has elasticity and can better close or open the first sidewall opening 110; the second sidewall valve 600 made of medical silicone material has elasticity and can better close or open the second sidewall opening 120.

[0056] For the blood purification catheter 1000 according to an embodiment of the present invention, a guide hole is provided at one end of the first tip valve 200 away from the tube body 100 or at one end of the second tip valve 300 away from the tube body 100. That is, in one embodiment, a guide hole is provided at one end of the first tip valve 200 away from the tube body 100. In another embodiment, a guide hole is provided at one end of the second tip valve 300 away from the tube body 100. It should be noted that the function of the guide hole is to allow the guide wire to penetrate during catheterization, so as to guide the blood purification catheter 1000 into the blood vessel 2000.

[0057] The blood purification catheter 1000 according to an embodiment of the present invention further includes a connecting three-way, a connecting tube, a connecting tube clamp, and a Luer connection joint. Among them, the connecting three-way is used to connect the tube body 100 and the two connecting tubes, so that the first chamber 700 and the second chamber 800 are respectively communicated with the two connecting tubes. The connecting tube clamp is used to clamp the connecting tube to facilitate the connection of the pipeline. The Luer connection joint is used to connect the blood purification pipeline.

[0058] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A blood purification catheter, characterized in that: include: tube body; A first tip valve is mounted on one end of the tube; a second cusp valve mounted on the same end of the tube; a partition plate, arranged in the tube body along the axial direction of the tube body, wherein the inner wall of the tube body, the partition plate and the first tip valve define a first chamber, and the inner wall of the tube body, the partition plate and the second tip valve define a second chamber, and the tube body is provided with a first side wall opening and a second side wall opening respectively communicating with the first chamber and the second chamber; A first side wall valve, mounted on the first side wall opening; A second side wall valve is installed in the second side wall opening; When the first chamber is under negative pressure, the first side wall valve opens the first side wall opening, and the first tip valve is in close contact with the partition; when the first chamber is under positive pressure, the first side wall valve closes the first side wall opening, and the first tip valve is separated from the partition, so that the first chamber is connected to the outside; When there is negative pressure in the second chamber, the second side wall valve opens the second side wall opening, and the second tip valve is tightly attached to the partition. When there is positive pressure in the second chamber, the second side wall valve closes the second side wall opening, and the second tip valve is separated from the partition to connect the second chamber with the outside.

2. The blood purification catheter according to claim 1, characterized in that: There are two first side wall openings, and the two first side wall openings are spaced apart along the circumference of the tube body.

3. The blood purification catheter according to claim 2, characterized in that: The two first side wall openings are respectively arranged close to two side edges of the partition.

4. The blood purification catheter according to claim 1, characterized in that: There are two second side wall openings, and the two second side wall openings are spaced apart along the circumference of the tube body.

5. The blood purification catheter according to claim 4, characterized in that: The two second side wall openings are respectively arranged close to the two side edges of the partition.

6. The blood purification catheter according to claim 1, characterized in that: The distance from one end of the first tip valve away from the tube body to the first side wall opening is d1, and the distance from one end of the second tip valve away from the tube body to the second side wall opening is d2, satisfying that: d1 and d2 are not equal.

7. The blood purification catheter according to claim 6, characterized in that: A distance d1 from one end of the first tip valve away from the tube body to the first side wall opening and a distance d2 from one end of the second tip valve away from the tube body to the second side wall opening are both greater than 3 cm.

8. The blood purification catheter according to claim 1, characterized in that: The first tip valve and the second tip valve are both made of medical silicone material.

9. The blood purification catheter according to claim 1, characterized in that: The first side wall valve and the second side wall valve are both made of medical silicone material.

10. The blood purification catheter according to claim 1, characterized in that: A guide hole is provided at one end of the first tip valve away from the tube body or at one end of the second tip valve away from the tube body.

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