Left ventricular drain tube and left ventricular drainage assembly

Abstract

The present invention provides a left ventricular drain tube that can sensitively detect whether or not blood has been completely aspirated from the left ventricle. [Solution] The left heart drain tube includes a drain tube with a hollow suction head 2 at one end, the suction head includes an inner core 21 and an elastic support member 22, the inner core has suction ports 211 spaced apart on its outer surface along its circumferential direction, the elastic support member is placed over the suction head and is expandable and contractible in response to changes in the pressure difference between the inside and outside of the suction head, the elastic support member is provided with an elastic opening 222 that changes its opening width according to its expansion and contraction, distance sensing devices are provided at both ends of the elastic support member so that the pressure difference between the inside and outside of the suction head can be monitored according to the amount of expansion and contraction of the elastic support member. An expandable and contractible elastic support member is provided on the outside of the suction head and the operation of the elastic support member can be detected using the distance sensing device.

Description

Technical Field

[0001] This application relates to the technical field of medical drainage devices, and particularly to a left heart drainage tube and a left heart drainage assembly.

Background Art

[0002] In extracorporeal circulation surgery, the spontaneous beating of the heart stops, and all the blood in the body is guided to the extracorporeal circulation device through the superior and inferior vena cava. However, a large amount of blood still accumulates inside the left ventricle. In order to prevent the expansion of the left ventricle and ensure a good surgical field of view, it is necessary to aspirate blood from the left ventricle.

[0003] As a prior art, an automatic decompression adjustment device for a left heart drainage tube has been disclosed. This device includes a Y-shaped connection pipeline provided with a first indicator lamp on the outside. In this connection pipeline, in addition to an elastic gasket, a rotating shaft, and a micromotor, a pressure collection module, an infrared sensing module, a memory module, a processing module, and a control module are provided. Thereby, the problem that the pressure inside the pipeline in the existing left heart drainage system cannot be automatically adjusted is solved.

[0004] However, during heart surgery, it is difficult to observe whether the blood inside the left ventricle has been completely aspirated with the existing left heart drainage tube. After the blood inside the left ventricle has been completely aspirated, a wall adsorption phenomenon is caused by the continuous negative pressure generated by the negative pressure suction device, which may damage the tissue of the left ventricle. In addition, large tissue masses such as blood clots in the blood are likely to clog the drainage tube, which also causes the negative pressure inside the drainage tube to rise, making the suction operation difficult, and further damaging the left ventricle.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a left ventricular drain tube that can more sensitively detect whether or not blood inside the left ventricle has been completely aspirated, and that can reduce the safety risks to the left ventricle caused by a sustained increase in negative pressure inside the drain tube. [Means for solving the problem]

[0006] The left heart drain tube of the present invention includes a drain tube having a hollow suction head at one end. The suction head includes an inner core and an elastic support member, the inner core having suction ports spaced apart on its outer surface along its circumferential direction, the elastic support member is fitted over the suction head and is expandable and contractible in response to changes in the pressure difference between the inside and outside of the suction head, the elastic support member is provided with an elastic opening that changes its opening width in response to its expansion and contraction, and distance sensing devices are provided at both ends of the elastic support member to monitor the pressure difference between the inside and outside of the suction head in accordance with the amount of expansion and contraction of the elastic support member.

[0007] When air is drawn into the drain tube, the negative pressure inside the suction head decreases, and consequently the pressure difference becomes smaller. At this time, the expandable and retractable elastic support member provided on the outside of the suction head extends, and the distance sensing device detects the increase in the distance between the ends of the elastic support member and activates, issuing a warning signal or stopping the negative pressure suction device via the control module. This solves the problem of difficulty in monitoring in real time whether or not blood inside the left ventricle has been completely aspirated.

[0008] If the suction port becomes clogged or if the negative pressure inside the suction head increases due to wall adhesion, the elastic support member retracts. The distance sensing device detects this retraction and issues a control signal, which stops the negative pressure suction device and prevents damage to the left ventricle due to excessively high negative pressure inside the suction head. Furthermore, since the elastic support member is fitted externally to the outside of the suction head, it itself provides a certain level of support and fastening force, preventing deformation of the suction head.

[0009] In one embodiment of the present invention, the left heart drain tube further includes a flexible outer sheath that is placed over the suction head and has a fluid supply port on its surface that is in a one-to-one correspondence with the suction port.

[0010] By providing a flexible outer sheath on the outside of the elastic support member, the suction head can not only adaptively deform in accordance with the displacement of the elastic support member after it is inserted into the left ventricle, but friction and abrasion against the left ventricle can also be reduced.

[0011] In one embodiment of the present invention, the left heart drain tube further includes an end cap, the end cap having a cavity inside, a position limiting ring coaxially fitted to the outside of the first end of the suction head near the drain tube, a through hole provided at the second end, the end cap slidingly sealing therein, the suction head communicating with the cavity of the end cap through the through hole.

[0012] By adopting the above solution, a slidable and sealing end cap is provided at the end of the suction head, and a cavity communicating with the inside of the suction head is provided inside the end cap. This allows the end cap to operate in response to changes in the negative pressure inside the suction head, thereby enabling the device to operate in response to changes in the pressure difference between the inside and outside of the suction head. This makes it easier to detect and determine blood aspiration operations within the left ventricle.

[0013] In one embodiment of the present invention, the elastic support member includes a columnar spring, the elastic opening is formed by a gap in the elastic support member, a sliding ring is coaxially slidably connected to the outside of the suction head, the sliding ring is fixedly connected to the inner wall of the end cap, and one end of the elastic support member is fixedly connected to the sliding ring and the other end is fixedly connected to the position limiting ring.

[0014] By adopting the above solution, a columnar spring is provided, and by setting the rigidity strength, i.e., elasticity, of the columnar spring, when the device is normally aspirating blood, the suction negative pressure is greater than the fluid damping and less than the elasticity of the columnar spring. At this time, the gap between the columnar springs, i.e., the elastic opening, allows for the normal passage of blood. In addition, the columnar spring, with its own rigidity strength, can support the flexible outer casing to some extent and prevent large tissue clumps from entering the drain tube.

[0015] Furthermore, if the suction port becomes clogged with a large tissue mass, the negative pressure inside the suction head will continuously increase. At this time, the columnar spring will contract, causing the elastic opening to shrink until it closes. This also helps to some extent to prevent large tissue masses from entering the drain tube due to the increase in negative pressure, and it also prevents the left ventricle from being attracted to the suction port by the continuously increasing negative pressure, thereby protecting the myocardial tissue of the left ventricle.

[0016] In one embodiment of the present invention, the distance detection device is At least two magnetic pillars are fixedly assembled to the end face of the end of the end cap closest to the drain tube, The system includes at least two linear hole tips fixed to and assembled with the position limiting ring, located on the side of the position limiting ring closest to the end cap, and having a one-to-one correspondence in position with the magnetic column.

[0017] By adopting the above solution, a magnetic column and a linear Hall tip are provided, and by utilizing the good magnetic transmission and the sensitivity of the linear Hall tip to changes in magnetic field detection, the operation of the end cap can be converted into an electrical signal and transmitted to the control module of the negative pressure suction device. This allows the device to detect and determine the blood suction status inside the left ventricle on behalf of a human.

[0018] In one embodiment of the present invention, the left heart drain tube further includes a magnetic stabilizing member, and the magnetic stabilizing member is At least two first magnetic bars are fixedly assembled to the end face of the end of the end cap closest to the drain tube, The system includes at least two second magnetic bars, which are fixedly assembled to the side of the position limiting ring closest to the end cap, and which correspond one-to-one in position with the first magnetic bar and are magnetically attracted to each other.

[0019] By adopting the above solution, when the negative pressure inside the drain tube increases, the end cap moves toward the drain tube, compressing the elastic support member. At this time, the first magnetic bar on the end cap side gradually moves toward the second magnetic bar, gradually increasing the magnetic attraction force between them. By utilizing the mutual attraction force between the first and second magnetic bars, fluctuations in the opening width of the elastic opening that occur when the elastic support member is compressed due to negative pressure fluctuations can be effectively prevented, and the stability of the elastic opening when it is closed can be improved.

[0020] In one embodiment of the present invention, a plurality of elastic damping rings are provided coaxially on the inner wall of the end of the end cap near the drain tube, and a wavy damping gap is provided between the plurality of elastic damping rings and the elastic support member to reduce the movement speed of the end cap on the suction head.

[0021] By adopting the above solution, an elastic damping ring is provided on the inner wall of the end cap, so that a damping gap is formed between the elastic damping ring and the elastic support member as the end cap approaches the drain tube. Fluid damping by the blood in the damping gap allows the device to absorb high-frequency vibrations of the end cap that may occur between the spring force and the suction force when it is in a critical negative pressure state (i.e., when it is compressed to the limit point where the spring support member closes), thereby improving stability.

[0022] In one embodiment of the present invention, the left heart drain tube further includes an elastic sheath provided on the elastic support member along the longitudinal direction of the elastic support member.

[0023] When the above solution is adopted, by providing an elastic sheath outside the elastic support member, when the elastic support member contracts until the elastic opening closes, the elastic sheath can increase the adhesion degree when the elastic openings close to each other, and improve the sealing performance with respect to the suction port.

[0024] In one embodiment of the present application, the left heart drainage tube further includes a mechanical stabilization member, and the mechanical stabilization member a fixing column having one end coaxially fixed and connected to the inner wall of the end cap and an elastic ball fixedly connected to the other end, a locking ring assembly including a connection frame fixedly connected to the inner wall of the through hole at the second end of the suction head, and a locking ring fixedly connected to the connection frame and having a diameter smaller than the diameter of the elastic ball.

[0025] When the above solution is adopted, when the negative pressure inside the drainage tube rises, the end cap moves in the direction approaching the drainage tube to compress the elastic support member. At this time, the elastic ball is compressed and deformed by the action of the pressure difference inside and outside the end cap, and can be engaged inside the locking ring, thereby having better stability when the elastic opening closes.

[0026] Another object of the present invention is to provide a left heart drainage assembly including the above left heart drainage tube and a joint head coaxially and fixedly connected to the other end of the drainage tube and connected to a negative pressure suction device.

[0027] When the above solution is adopted, by using the joint head to connect the left heart drainage tube and the negative pressure suction device to each other, an effective and stable negative pressure can be continuously formed in the drainage tube by the negative pressure suction device, thereby smoothly sucking the blood inside the left ventricle.

Advantages of the Invention

[0028] To sum up, the present application has at least one of the following beneficial technical effects.

[0029] 1. By providing an elastic support member and connecting the elastic support member to the end cap, and by providing the end cap to be slidably sealed outside one end of the suction head, when the negative pressure inside the suction head changes due to external factors, the end cap operates in accordance with the change in the pressure difference between blood pressure and internal negative pressure, thereby causing the elastic support member to expand and contract. As a result, when the negative pressure inside the drain tube increases, the elastic opening of the elastic support member closes, preventing large tissue clumps from entering the drain tube. Furthermore, the rigid strength of the elastic support member itself prevents the movement of the suction head caused by the increased negative pressure, thereby reducing the possibility of damaging the left ventricle.

[0030] 2. By combining an elastic support member with a distance sensing device, the end cap moves closer to or further away from the drain tube in response to changes in the magnetic field between the magnetic column and the linear hole tip during operation. This, in turn, allows the device to determine the working status of the suction head aspirating blood from inside the left ventricle based on the change in distance, and control the negative pressure suction device. This not only prevents the suction head from causing dry aspiration or wall adhesion inside the left ventricle, but also prevents further damage to the left ventricle by blocking the suction port when the suction head becomes clogged.

[0031] 3. By providing a magnetic stabilizing member between the end cap and the position limiting ring, the stability when the end cap presses against the columnar spring under the action of a pressure difference is improved by utilizing the attractive force between the first magnetic bar and the second magnetic bar, thereby avoiding vibration of the end cap due to fluctuations in negative pressure inside the suction head, and ultimately improving the operational stability of the device.

[0032] 4. By providing an elastic damping ring on the inner wall of the end cap and utilizing the damping gap formed between the elastic damping ring and the elastic support member, the blood experiences greater fluid damping within the damping gap, thereby slowing down the movement speed of the end cap, improving the stability of the device during operation under special conditions, and ultimately improving the safety of using the device. [Brief explanation of the drawing]

[0033] [Figure 1] This is a front cross-sectional view of a left ventricular drain tube according to the first embodiment of the present application. [Figure 2] This is an exploded perspective view of a left ventricular drain tube according to the first embodiment of the present invention. [Figure 3] This is a perspective view of the flexible outer sheath of a left ventricular drain tube according to the first embodiment of the present invention. [Figure 4] This is a front cross-sectional view of the suction head of a left heart drain tube according to the first embodiment of the present application. [Figure 5] This is an enlarged schematic diagram of part A in Figure 4. [Figure 6] This is a perspective view of the end cap of a left heart drain tube according to the first embodiment of the present application. [Figure 7] This is an exploded perspective view of a magnetic stabilizing member for a left heart drain tube according to a second embodiment of the present invention. [Figure 8] This is an exploded perspective view of the elastic damping ring of a left heart drain tube according to the third embodiment of the present invention. [Figure 9] This is a cross-sectional view of an elastic support member for a left heart drain tube according to the first embodiment of the present application. [Figure 10] This is a cross-sectional view of a mechanical stabilizing member for a left heart drain tube according to a fourth embodiment of the present application. [Figure 11] This is a perspective view of a mechanical stabilizing member for a left heart drain tube according to a fourth embodiment of the present application. [Figure 12] This is a cross-sectional view of a left ventricular drainage assembly according to the first embodiment of the present application. [Figure 13] This is a perspective view of the bonding head of a left ventricular drainage assembly according to the first embodiment of the present application. [Modes for carrying out the invention]

[0034] The left ventricular drain tube and left ventricular drainage assembly according to this invention will be explained in more detail below with reference to Figures 1 to 13.

[0035] The left ventricular drain tube in the embodiment of the present application includes drain tube 1. (Example 1)

[0036] In the first embodiment, the drain tube 1 is provided with a hollow suction head 2 at one end. The suction head 2 includes an inner core 21 and an elastic support member 22. The inner core 21 has suction ports 211 spaced apart on its outer surface along its circumferential direction. The elastic support member 22 is placed over the suction head 2 and is expandable and contractible in response to changes in the pressure difference between the inside and outside of the suction head 2. The elastic support member 22 is provided with an elastic opening 222 that changes its opening width in response to its expansion and contraction. Distance detection devices 3 are provided at both ends of the elastic support member 22. The pressure difference between the inside and outside of the suction head 2 can be monitored according to the amount of expansion and contraction of the elastic support member 22. The expandable and contractible elastic support member 22 can be provided outside the suction head 2, and by detecting the operation of the elastic support member 22 with the distance detection device 3, a warning signal can be issued or the negative pressure suction device can be stopped by the control module. Furthermore, the elastic support member 22 can also provide a certain support and fastening force to close the suction port 211, thereby preventing deformation of the suction head 2 and preventing the wall from being attracted to it.

[0037] A locking ring can be further provided on the outside of the drain tube 1 to adjust the hanging position of the drain tube 1 according to the needs of the actual scene.

[0038] The left ventricular drain tube further includes a flexible outer sheath 23 that covers the suction head 2. A fluid inlet 231 is provided on the surface of the flexible outer sheath 23, which corresponds one-to-one with the suction port 211. By providing the flexible outer sheath 23 on the outside of the elastic support member 22, friction and abrasion against the left ventricle by the suction head 2 can be reduced.

[0039] In this embodiment, the flexible outer layer 23 may be made of medical-grade silicone rubber.

[0040] The left heart drain tube further includes an end cap 24. A cavity 241 is provided inside the end cap 24. A position limiting ring 25 is coaxially fitted to the outside of the first end of the suction head 2 closest to the drain tube 1, and a through hole is provided at the second end, to which the end cap 24 is slidably sealed, and the second end communicates with the cavity 241 of the end cap 24 through the through hole. The slidably sealed end cap 24 provided at the second end of the suction head 2 can operate in response to changes in the pressure difference inside and outside the suction head 2, thereby facilitating detection and determination of blood aspiration operations within the left ventricle.

[0041] An annular shoulder is provided on the outside of the first end of the suction head 2, which is closest to the drain tube 1, and can be coaxially fixed to the position limiting ring 25 by press-fit rivet construction.

[0042] The elastic support member 22 includes a columnar spring, and the elastic opening 222 is formed by the gap in the elastic support member 22. A sliding ring 26 is coaxially slidably connected to the outside of the suction head 2, and the sliding ring 26 is fixedly connected to the inner wall of the end cap 24. One end of the elastic support member 22 is fixedly connected to the sliding ring 26, and the other end is fixedly connected to the position limiting ring 25. Since the second end of the suction head 2 communicates with the end cap 24, the rigidity of the columnar spring ensures that when the device normally aspirates blood, the suction negative pressure is greater than the fluid damping and less than the elasticity of the columnar spring. At this time, the elastic opening 222 allows for the normal passage of blood. In addition, the columnar spring, due to its own rigidity, can not only support the flexible outer shell 23 to some extent, but can also prevent large tissue clumps from entering the drain tube 1, and in the event of a blockage, it closes the elastic opening 222 to protect the myocardial tissue of the left ventricle.

[0043] In this embodiment, the columnar spring may be a medical-grade stainless steel component.

[0044] The distance detection device 3 includes at least two magnetic pillars 31 fixedly assembled to the end face of the end of the end cap 24 closest to the drain tube 1, and at least two linear hole tips 32 fixedly assembled to the side of the position limiting ring 25 closest to the end cap 24. The linear hole tips 32 correspond one-to-one in position to the magnetic pillars 31, and by providing the magnetic pillars 31 and the linear hole tips 32, and utilizing the good transmission of magnetic force and the sensitivity of the linear hole tips 32 to changes in magnetic force detection, the operation of the end cap 24 is converted into an electrical signal, thereby enabling the device to detect and determine blood aspiration inside the left ventricle.

[0045] In this embodiment, a signal transmission wire is pre-embedded within the wall of the drain tube 1. One end of the wire is connected to the hole tip 32, and the other end extends to the end of the drain tube 1 and is connected to an external device.

[0046] In this embodiment, the linear hole tip 32 employs three-stage insulation protection. In the first stage, a Parylene C layer is vapor-deposited onto the surface of the linear hole tip 32 and the soldering point. In the second stage, the linear hole tip 32 is completely encased in epoxy resin or UV adhesive and completely sealed into the groove of the position limiting ring 25. In the third stage, a secondary injection molding process is used to completely cover the placement area of ​​the linear hole chip 32 with the outer wall material of the position limiting ring 25, thereby forming a seamless and continuous insulating interface compliant with the IEC 60601-1 standard.

[0047] The left heart drain tube further includes an elastic sheath 221, which is provided on the outside of the elastic support member 22 along its longitudinal direction. Providing the elastic sheath 221 on the outside of the elastic support member 22 improves the airtightness when the elastic openings 222 are closed together.

[0048] In this embodiment, the elastic sheath 221 may be a medical rubber component.

[0049] Another object of the present invention is to provide a left ventricular drainage assembly comprising a left ventricular drain tube and a connecting head 6 that is coaxially fixedly connected to the other end of the drain tube 1. The connecting head 6 is connected to a negative pressure suction device, and by using the connecting head 6 to connect the left ventricular drain tube 1 and the negative pressure suction device, the negative pressure suction device can stably and continuously aspirate blood from inside the left ventricle. (Example 2)

[0050] Example 2 is structurally almost identical to Example 1, except for the following points.

[0051] To improve stability when the elastic opening 222 is closed, the left heart drain tube further includes a magnetic stabilizing member 4. The magnetic stabilizing member 4 includes at least two first magnetic bars 41 and at least two second magnetic bars 42. The first magnetic bars 41 are fixedly assembled to the end face of the end of the end cap 24 closest to the drain tube 1, and the second magnetic bars 42 are fixedly assembled to the side of the position limiting ring 25 closest to the end cap 24, with the first magnetic bars 41 and the second magnetic bars 42 corresponding to each other in a one-to-one relationship. The first magnetic bars 41 and the second magnetic bars 42 are magnetically attracted to each other, and through the adsorption force between the first magnetic bars 41 and the second magnetic bars 42, fluctuations in the opening width of the elastic opening 222 due to fluctuations in negative pressure can be effectively prevented, thereby making the elastic opening 222 more stable when closed. (Example 3)

[0052] Example 3 is structurally almost identical to Example 1, except for the following points.

[0053] To appropriately reduce the operating speed of the end cap, a plurality of elastic damping rings 242 are coaxially provided on the inner wall of the end cap 24 near the drain tube 1, and a wave-shaped damping gap is provided between the plurality of elastic damping rings 242 and the elastic support member 22 to reduce the moving speed of the end cap 24 on the suction head 2. By providing the elastic damping rings 242 on the inner wall of the end cap 24, high-frequency vibrations that may be generated by the end cap 24 can be absorbed by the fluid damping between the elastic damping rings 242 and the elastic support member 22, thereby improving stability.

[0054] In this embodiment, the elastic damping ring 242 may be a medical rubber component. (Example 4)

[0055] Example 4 is structurally almost identical to Example 1, except for the following points.

[0056] To improve stability when the elastic opening 222 is closed, the left heart drain tube further includes a mechanical stabilizing member 5, the mechanical stabilizing member 5 including a fixed column 51 and a locking ring assembly 53. The fixed column 51 has one end coaxially fixed to the inner wall of the end cap 24 and an elastic ball 52 fixed to the other end. The locking ring assembly 53 includes a connecting frame 531 and a locking ring 532, the connecting frame 531 being fixed to the inner wall of the through hole at one end of the suction head 2 and the locking ring 532 being fixed to the connecting frame 531. The diameter of the locking ring 532 is smaller than the diameter of the elastic ball 52. When the negative pressure inside the drain tube 1 increases, the elastic ball 52 engages inside the locking ring 532 under the action of the pressure difference inside and outside the end cap 24, resulting in better stability when the elastic opening 222 is closed.

[0057] In this embodiment, the elastic ball 52 may be a medical rubber component.

[0058] The above are all preferred embodiments of the present application and do not limit the scope of protection of the present application. Therefore, all equivalent modifications made in accordance with the structure, shape, and principle of the present application should be included within the scope of protection of the present application. [Explanation of Symbols]

[0059] 1…Drain tube 2... Suction head 21…Inner core 211...Suction port 22...Elastic support member 221...Elastic sheath 222...Elastic opening 23… Flexible outer layer 231…Liquid supply port 24… End cap 241...Cavity 242... Elastic damping ring 25…Location restriction ring 26... Sliding ring 3… Distance detection device 31… Magnetic Pillar 32…Linear Hole Tip 4…Magnetic stabilizing member 41…First magnetic bar 42...Second magnetic bar 5… Mechanical stabilizing member 51…Fixed pillar 52... Elastic ball 53… Locking ring assembly 531...Connection Frame 532... Locking ring 6... Joining head

Claims

1. The drain tube (1) includes a hollow suction head (2) at one end, The suction head (2) includes an inner core (21) and an elastic support member (22). The inner core (21) has suction ports (211) spaced apart on its outer surface along its circumferential direction. The elastic support member (22) is placed over the suction head (2) and is expandable and contractible in response to changes in the pressure difference between the inside and outside of the suction head (2). The elastic support member (22) is provided with an elastic opening (222) that changes its opening width in response to its expansion and contraction. Distance detection devices (3) are provided at both ends of the elastic support member (22) to monitor the pressure difference between the inside and outside of the suction head (2) in accordance with the amount of expansion and contraction of the elastic support member (22). A left ventricular drain tube characterized by the following features.

2. The left heart drain tube according to claim 1, further comprising a flexible outer shell (23) that is placed over the suction head (2) and has a fluid supply port (231) on its surface that corresponds one-to-one with the suction port (211).

3. The left heart drain tube according to claim 2, further comprising an end cap (24), wherein a cavity (241) is provided inside the end cap (24), a position limiting ring (25) is coaxially fitted to the outside of the first end of the suction head (2) near the drain tube (1), a through hole is provided at the second end, and the end cap (24) is slidably sealed, and the suction head (2) communicates with the cavity (241) of the end cap (24) through the through hole.

4. The left heart drain tube according to claim 3, characterized in that the elastic support member (22) includes a columnar spring, the elastic opening (222) is formed by the gap in the elastic support member (22), a sliding ring (26) is coaxially slidably connected to the outside of the suction head (2), the sliding ring (26) is fixedly connected to the inner wall of the end cap (24), one end of the elastic support member (22) is fixedly connected to the sliding ring (26), and the other end is fixedly connected to the position limiting ring (25).

5. The distance detection device (3) is At least two magnetic pillars (31) are fixedly assembled to the end face of the end of the end cap (24) near the drain tube (1), The left heart drain tube according to claim 4, comprising: at least two linear hole tips (32) fixedly assembled to the position limiting ring (25), located on the side of the position limiting ring (25) near the end cap (24), and having a one-to-one correspondence in position with the magnetic column (31).

6. The present invention further includes a magnetic stabilizing member (4), wherein the magnetic stabilizing member (4) is At least two first magnetic bars (41) are fixedly assembled to the end face of the end of the end cap (24) near the drain tube (1), The left heart drain tube according to claim 5, comprising: at least two second magnetic bars (42) fixedly assembled to the side of the position limiting ring (25) on the side closer to the end cap (24), having a one-to-one positional correspondence with the first magnetic bar (41), and magnetically attracting each other with the first magnetic bar (41).

7. The left heart drain tube according to claim 5, characterized in that a plurality of elastic damping rings (242) are coaxially provided on the inner wall of the end of the end cap (24) closest to the drain tube (1), and a wavy damping gap is provided between the plurality of elastic damping rings (242) and the elastic support member (22) to reduce the speed at which the end cap (24) moves on the suction head (2).

8. The left heart drain tube according to claim 4, further comprising an elastic sheath (221) provided on the elastic support member (22) along the longitudinal direction of the elastic support member (22).

9. The present invention further includes a mechanical stabilizing member (5), the mechanical stabilizing member (5) is A fixing column (51) is connected at one end to the inner wall of the end cap (24) in a coaxial manner, and to the other end to which an elastic ball (52) is fixedly connected, The left heart drain tube according to claim 4, further comprising: a connecting frame (531) fixedly connected to the inner wall of the through hole at the second end of the suction head (2); and a locking ring assembly (53) fixedly connected to the connecting frame (531) and including a locking ring (532) having a diameter smaller than the diameter of the elastic ball (52).

10. A left heart drain tube according to any one of claims 1 to 9, and a connecting head (6) that is coaxially fixedly connected to the other end of the drain tube (1) and connected to a negative pressure suction device, A left ventricular drainage assembly characterized by the following features.

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