Additional device for left heart flow turning

Abstract

The additional device comprises an extracorporeal circulation water tank, a temperature changing structure suitable for adjusting the temperature of liquid in the extracorporeal circulation water tank is installed in the extracorporeal circulation water tank, and a blood channel located in the liquid in the extracorporeal circulation water tank is arranged in the extracorporeal circulation water tank. A blood inlet is formed in the top of the extracorporeal circulation water tank, and a blood outlet is formed in the bottom of the extracorporeal circulation water tank. Blood flowing out of the human body is introduced into the blood channel of the extracorporeal circulation water tank from the blood inlet through the centrifugal pump, liquid in the extracorporeal circulation water tank is adjusted to the proper temperature through the temperature changing structure, temperature adjustment and heat preservation can be conducted on the blood channel, and therefore the blood flowing through the extracorporeal circulation water tank is reheated, and the temperature of the blood is kept constant; the rewarmed blood flows out of the blood outlet and then enters the human body, the arrhythmia or ventricular fibrillation risk of an operator caused by cooling when the blood flows out of the body is avoided, rewarming through a membrane lung is not needed, and the success rate of the operation can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an additional device for left ventricular bypass. Background Art

[0002] In thoracic and abdominal aortic aneurysm repair surgeries, the "left heart bypass" technique is increasingly being used, which involves draining arterial blood from the left atrium and pumping it into the femoral artery through a centrifugal pump. This avoids many complications of traditional surgery such as "deep hypothermic circulatory arrest" or blocking both ends of the "tumor" at room temperature, which often lead to very serious consequences such as paraplegia or even death.

[0003] However, left ventricular bypass presents a problem: blood naturally cools as it passes outside the body. This can lead to lower body temperature during prolonged surgery, posing a risk of arrhythmias or even ventricular fibrillation. Furthermore, if the room temperature is too high, it will not meet the requirements for left ventricular bypass. During left ventricular bypass surgery, the room temperature is generally maintained at 34°C, while the blood temperature needs to be maintained at 37°C at the end of the procedure. Most existing technologies use membrane lung rewarming to address this issue, but this approach has numerous drawbacks. First, it is expensive. Second, it carries the risk of malfunction in the membrane lung's temperature-changing system and oxygenation system. Since left ventricular bypass does not require oxygenation, this risk is negligible. Third, and most importantly, the use of a membrane lung requires a higher dose of heparin. Furthermore, bleeding is a major concern during surgery itself, and high doses of heparin only exacerbate the problem, sometimes leading to surgical failure simply due to bleeding. Utility Model Content

[0004] Therefore, the technical problem of the present invention is to solve the defects of the prior art in left ventricular bypass surgery, such as low blood temperature flowing through the body and high risk of rewarming using membrane lung, thereby providing an additional device for left ventricular bypass.

[0005] In order to solve the above technical problems, the technical solutions of the present utility model are as follows:

[0006] An additional device for left cardiac bypass, comprising an extracorporeal circulation water tank, wherein a temperature-variable structure suitable for adjusting the temperature of the liquid in the extracorporeal circulation water tank is installed in the extracorporeal circulation water tank, wherein a blood channel located in the liquid of the extracorporeal circulation water tank is provided in the extracorporeal circulation water tank, wherein a blood inlet and a blood outlet are respectively provided on the extracorporeal circulation water tank, wherein the blood inlet is provided at the top of the extracorporeal circulation water tank, and the blood outlet is provided at the bottom of the extracorporeal circulation water tank; blood drained from the left atrium of the human body is suitable for entering the interior of the extracorporeal circulation water tank from the blood inlet, wherein a centrifugal pump located between the human body and the blood inlet is provided on the blood inlet; and after the human body's blood flows into the interior of the extracorporeal circulation water tank, it flows out from the blood outlet.

[0007] Furthermore, a filter is provided at the top of the extracorporeal circulation water tank, and the filter is provided below the blood inlet.

[0008] Furthermore, the pore size of the filter mesh is 70-90 μm.

[0009] Furthermore, a water inlet and a water outlet are respectively provided on the side walls of the extracorporeal circulation water tank, and the position of the water inlet is lower than that of the water outlet.

[0010] Furthermore, a pressure measuring structure is connected to the side wall of the extracorporeal circulation water tank through an air pressure tube.

[0011] Furthermore, one end of the air pressure tube away from the extracorporeal circulation water tank is connected to a three-way cock, the pressure measuring structure is installed on the three-way cock, and the three-way cock is also provided with an exhaust valve.

[0012] Furthermore, a polytetrafluoroethylene film is provided in one end of the exhaust valve away from the three-way stopcock.

[0013] Furthermore, a disposable temperature measuring component is provided on the extracorporeal circulation water tank.

[0014] Furthermore, the temperature-changing structure is a temperature-changing wire, and a plurality of the temperature-changing wires are evenly and densely arranged on the inner wall of the extracorporeal circulation water tank.

[0015] Furthermore, polyethylene terephthalate is provided in the temperature-variable wire.

[0016] The technical solution of this utility model has the following advantages:

[0017] 1. The utility model provides an additional device for left ventricular bypass, which introduces blood flowing out of the human body from the blood inlet into the blood channel of the extracorporeal circulation water tank through a centrifugal pump, and adjusts the liquid in the extracorporeal circulation water tank to an appropriate temperature through a temperature-variable structure, thereby regulating and preserving the temperature of the blood channel in the liquid in the extracorporeal circulation water tank, thereby rewarming the blood passing through and keeping the blood at a constant temperature. The rewarmed blood flows out from the blood outlet and then enters the human body, avoiding the risk of arrhythmia or ventricular fibrillation caused by the cooling of the blood when flowing outside the body. There is no need to use a membrane lung for rewarming, thus avoiding the risks of using a membrane lung, and can effectively improve the success rate of the operation.

[0018] 2. The utility model provides an additional device for left ventricular bypass. A filter is installed on the top of the extracorporeal circulation water tank, below the blood inlet. This arrangement can filter out microemboli in the blood before the blood enters the blood channel within the extracorporeal circulation water tank, preventing microemboli from re-entering the body and blocking blood flow.

[0019] 3. The filter mesh of the auxiliary device for left ventricular bypass provided by this invention has a pore size of 70-90 μm. This configuration can prevent the filter mesh from being too small, which would create significant resistance and prevent blood from passing through. It also prevents the filter mesh from being too large, which would cause the filter shell to lose its filtration effect and cause microemboli in the blood to re-enter the body and block blood flow.

[0020] 4. The utility model provides an additional device for left ventricular bypass, with a water inlet and outlet provided on the side wall of the extracorporeal circulation water tank, with the water inlet positioned lower than the water outlet. This arrangement allows air in the liquid-containing pipes within the extracorporeal circulation water tank to rise, preventing air blockage and keeping the pipes filled at all times, thereby ensuring stable flow rate and, in turn, uniformity of the heated liquid, thereby ensuring uniformity of the rewarming of the blood flowing through it.

[0021] 5. The utility model provides an additional device for left ventricular bypass. The side wall of the extracorporeal circulation water tank is connected to a pressure measuring structure through a pressure tube. This arrangement allows the pressure of the blood pipe to be measured as it passes through the extracorporeal circulation water tank, so as to observe whether the blood flow is within the appropriate pressure.

[0022] 6. The utility model provides an additional device for left ventricular bypass. The end of the air pressure tube away from the extracorporeal circulation water tank is connected to a three-way stopcock. A pressure measuring structure is mounted on the three-way stopcock, and an exhaust valve is also provided on the three-way stopcock. If the pressure measuring structure detects excessive blood pressure in the extracorporeal circulation water tank, the exhaust valve can be adjusted to maintain a stable pressure.

[0023] 7. The auxiliary device for left ventricular bypass provided by this utility model has a polytetrafluoroethylene membrane installed in the exhaust valve at the end away from the three-way stopcock. This arrangement prevents the exhaust valve from clogging and contamination, thereby ensuring the long-term stable operation and safety of the exhaust valve system.

[0024] 8. The utility model provides an additional device for left ventricular bypass, and a disposable temperature measuring element is installed on the extracorporeal circulation water tank. This arrangement allows the temperature measuring element to be used to monitor at any time whether the temperature inside the extracorporeal circulation water tank meets the required temperature. Furthermore, the disposable nature of the temperature measuring element eliminates the need for repeated disinfection and reduces the risk of cross-infection between patients.

[0025] 9. The auxiliary device for left ventricular bypass provided by the present invention utilizes variable temperature wires as the temperature-changing structure. Several variable temperature wires are evenly and densely arranged on the inner wall of the extracorporeal circulation water tank. This arrangement, using variable temperature wires as the temperature-changing structure, improves heating efficiency and safety. Furthermore, compared to heating using a single temperature-changing plate, the use of variable temperature wires allows for precise temperature control and faster temperature changes, avoiding unnecessary energy consumption and significantly reducing energy waste during the heat preservation phase.

[0026] 10. The utility model provides an additional device for left ventricular bypass, in which polyethylene terephthalate is placed within the temperature-variable wire. This arrangement can reduce gas and water vapor, allowing long-term use within a temperature range of no more than 70°C, and having minimal impact on its mechanical properties at high or low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of an additional device for left ventricular bypass provided in an embodiment of the present utility model.

[0029] Explanation of the accompanying symbols: 1. Extracorporeal circulation water tank; 2. Temperature variable structure; 3. Blood inlet; 4. Blood outlet; 5. Centrifugal pump; 6. Filter; 7. Water inlet; 8. Water outlet; 9. Air pressure tube; 10. Pressure measuring structure; 11. Three-way stopcock; 12. Exhaust valve; 13. Polytetrafluoroethylene membrane; 14. Disposable temperature measuring component. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] like Figure 1 The illustrated additional device for left cardiac bypass comprises an extracorporeal circulation water tank 1, in which a temperature-changing structure 2 for adjusting the temperature of the liquid in the extracorporeal circulation water tank 1 is installed. A blood channel located in the liquid of the extracorporeal circulation water tank 1 is provided in the extracorporeal circulation water tank 1. A blood inlet 3 and a blood outlet 4 are provided on the extracorporeal circulation water tank 1, respectively. The blood inlet 3 is provided at the top of the extracorporeal circulation water tank 1, and the blood outlet 4 is provided at the bottom of the extracorporeal circulation water tank 1. Blood drained from the left atrium of the human body is suitable for entering the interior of the extracorporeal circulation water tank 1 through the blood inlet 3. A centrifugal pump 5 is provided on the blood inlet 3 between the human body and the blood inlet 3. After the human blood flows into the interior of the extracorporeal circulation water tank 1, it flows out through the blood outlet 4.

[0035] This additional device for left ventricular bypass introduces the blood flowing out of the human body from the blood inlet 3 into the blood channel of the extracorporeal circulation water tank 1 through the centrifugal pump 5, and adjusts the liquid in the extracorporeal circulation water tank 1 to an appropriate temperature through the temperature variable structure 2, thereby regulating and keeping the temperature of the blood channel in the liquid in the extracorporeal circulation water tank 1, thereby rewarming the temperature of the passing blood and keeping the blood at a constant temperature. The rewarmed blood flows out from the blood outlet 4 and then enters the human body, avoiding the risk of arrhythmia or ventricular fibrillation caused by the cooling of the blood when flowing outside the body. There is no need to use a membrane lung for rewarming, avoiding the risks of using a membrane lung, and effectively improving the success rate of the operation.

[0036] In this embodiment, a water inlet 7 and a water outlet 8 are provided on the sidewall of the extracorporeal circulation water tank 1, with the water inlet 7 positioned lower than the water outlet 8. This arrangement allows air in the liquid-containing pipeline within the extracorporeal circulation water tank 1 to rise, preventing air blockage and keeping the pipeline filled at all times, thereby ensuring flow stability and, in turn, uniformity of the heated liquid, thereby ensuring uniform rewarming of the blood flowing therethrough.

[0037] In this embodiment, a filter screen 6 is provided at the top of the extracorporeal circulation water tank 1, and the filter screen 6 is provided below the blood inlet 3. With this arrangement, microemboli in the blood can be filtered out by the filter screen 6 before the blood enters the blood channel in the extracorporeal circulation water tank 1, thereby preventing the microemboli in the blood from re-entering the human body and blocking the blood flow. Specifically, the aperture of the filter screen 6 is 80 μm. With this arrangement, it is possible to avoid the aperture of the filter screen 6 being too small, thereby forming a large resistance, thereby preventing the blood from passing through; and at the same time, it is possible to avoid the aperture of the filter screen 6 being too large, thereby preventing the filter screen 6 from being ineffective and unable to achieve the filtering effect, thereby causing the microemboli in the blood to re-enter the human body and block the blood flow.

[0038] In this embodiment, a pressure measuring structure 10 is connected to the side wall of the extracorporeal circulation water tank 1 through an air pressure tube 9. With this arrangement, the pressure of the pipeline can be measured when the blood passes through the extracorporeal circulation water tank 1, so as to observe whether the blood flow is at an appropriate pressure. Specifically, a three-way stopcock 11 is connected to the end of the air pressure tube 9 away from the extracorporeal circulation water tank 1, and the pressure measuring structure 10 is installed on the three-way stopcock 11, and an exhaust valve 12 is also provided on the three-way stopcock 11. As expected, when the pressure measuring structure 10 measures that the pressure of the blood flowing through the extracorporeal circulation water tank 1 is too high, the pressure can be kept stable by adjusting the exhaust valve 12. Specifically, a polytetrafluoroethylene membrane 13 is provided in the end of the exhaust valve 12 away from the three-way stopcock 11. With this arrangement, the polytetrafluoroethylene membrane 13 can prevent the exhaust valve 12 from being blocked and contaminated, thereby ensuring the long-term stable operation and safety of the exhaust valve 12 system.

[0039] In this embodiment, the extracorporeal circulation water tank 1 is equipped with a disposable temperature measuring element. This allows the temperature measuring element to be used to monitor the temperature inside the extracorporeal circulation water tank 1 at any time to ensure it meets the desired temperature. Furthermore, the disposable nature of the temperature measuring element eliminates the need for repeated disinfection and reduces the risk of cross-infection between patients. Specifically, a temperature measuring hole is provided on the side wall of the extracorporeal circulation water tank 1, into which the disposable temperature measuring element is inserted to measure the temperature inside the extracorporeal circulation water tank 1.

[0040] In this embodiment, the temperature-variable structure 2 is a temperature-variable wire, and a number of temperature-variable wires are evenly and densely arranged on the inner wall of the extracorporeal circulation water tank 1. With such a configuration, the use of a temperature-variable wire as the temperature-variable structure 2 can improve heating efficiency and safety. At the same time, compared with the method of using a whole temperature-variable plate for heating, the use of a temperature-variable wire can accurately control the temperature, and the temperature change speed is faster, avoiding unnecessary energy consumption, especially in the heat preservation stage, which can significantly reduce energy waste. Specifically, polyethylene terephthalate is provided in the temperature-variable wire. With such a configuration, gas and water vapor can be reduced, and it can be used for a long time within a temperature range not higher than 70°C, and its mechanical properties are affected very little at high and low temperatures.

[0041] In summary, this additional device for left ventricular bypass introduces the blood flowing out of the human body from the blood inlet 3 into the blood channel of the extracorporeal circulation water tank 1 through the centrifugal pump 5, and adjusts the liquid in the extracorporeal circulation water tank 1 to an appropriate temperature through the temperature variable structure 2, thereby regulating and keeping warm the blood channel in the liquid in the extracorporeal circulation water tank 1, thereby rewarming the temperature of the passing blood and keeping the blood at a constant temperature. The rewarmed blood flows out from the blood outlet 4 and then enters the human body, avoiding the risk of surgical arrhythmia or ventricular fibrillation caused by cooling of the blood when flowing outside the body. There is no need to use a membrane lung for rewarming, avoiding the risks of using a membrane lung, and effectively improving the success rate of the operation.

[0042] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An additional device for left ventricular bypass, characterized in that: The invention comprises an extracorporeal circulation water tank (1), wherein a temperature-changing structure (2) suitable for adjusting the temperature of the liquid in the extracorporeal circulation water tank (1) is installed in the extracorporeal circulation water tank (1), wherein a blood channel located in the liquid of the extracorporeal circulation water tank (1) is provided in the extracorporeal circulation water tank (1), wherein a blood inlet (3) and a blood outlet (4) are respectively provided on the extracorporeal circulation water tank (1), wherein the blood inlet (3) is provided at the top of the extracorporeal circulation water tank (1), and the blood outlet (4) is provided at the bottom of the extracorporeal circulation water tank (1); blood drained from the left atrium of a human body is suitable for entering the interior of the extracorporeal circulation water tank (1) from the blood inlet (3), wherein a centrifugal pump (5) located between the human body and the blood inlet (3) is provided on the blood inlet (3); and after the human body's blood flows into the interior of the extracorporeal circulation water tank (1), it flows out from the blood outlet (4).

2. The additional device for left ventricular bypass according to claim 1, characterized in that: A filter screen (6) is provided at the top of the extracorporeal circulation water tank (1), and the filter screen (6) is provided below the blood inlet (3).

3. The additional device for left ventricular bypass according to claim 2, characterized in that: The pore size of the filter (6) is 70-90 μm.

4. The additional device for left ventricular bypass according to claim 1, characterized in that: A water inlet (7) and a water outlet (8) are respectively provided on the side walls of the extracorporeal circulation water tank (1), and the position of the water inlet (7) is lower than that of the water outlet (8).

5. The additional device for left ventricular bypass according to claim 1, characterized in that: A pressure measuring structure (10) is connected to the side wall of the extracorporeal circulation water tank (1) via an air pressure tube (9).

6. The additional device for left ventricular bypass according to claim 5, characterized in that: The air pressure tube (9) is connected to a three-way cock (11) at one end away from the extracorporeal circulation water tank (1), the pressure measuring structure (10) is installed on the three-way cock (11), and the three-way cock (11) is also provided with an exhaust valve (12).

7. The additional device for left ventricular bypass according to claim 6, characterized in that: A polytetrafluoroethylene membrane (13) is provided in one end of the exhaust valve (12) away from the three-way cock (11).

8. The additional device for left ventricular bypass according to claim 1, characterized in that: The extracorporeal circulation water tank (1) is provided with a disposable temperature measuring component.

9. The additional device for left ventricular bypass according to claim 1, characterized in that: The temperature-changing structure (2) is a temperature-changing wire, and a plurality of the temperature-changing wires are evenly and densely arranged on the inner wall of the extracorporeal circulation water tank (1).

10. The additional device for left ventricular bypass according to claim 9, characterized in that: Polyethylene terephthalate is arranged in the temperature-variable wire.

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