Left heart drainage tube and left heart drainage assembly

Abstract

The left heart drainage tube comprises a drainage tube body, one end of the drainage tube body is provided with a hollow suction head, the suction head comprises an inner core and an elastic supporting piece, suction openings are formed in the side face of the inner core in the circumferential direction of the inner core at intervals, and the suction head is sleeved with the elastic supporting piece; the elastic supporting piece is provided with an elastic opening, the opening degree of the elastic opening can be changed along with stretching of the elastic supporting piece, distance sensing devices are arranged at the two ends of the elastic supporting piece, and the internal and external pressure difference of the suction head can be monitored according to the stretching amount of the elastic supporting piece. The telescopic elastic supporting piece is arranged outside the suction head, the action of the elastic supporting piece is sensed through the distance sensing device, so that a warning signal is sent out, or the negative pressure suction device is closed through the control module, in addition, the elastic supporting piece can also provide certain supporting fastening force and block the suction opening, and therefore the suction head is convenient to use. And the situation of wall suction can be avoided while deformation of the suction head is avoided.

Description

Technical Field

[0001] This application relates to the field of medical drainage device technology, and in particular to a left ventricular drainage tube and a left ventricular drainage assembly. Background Technology

[0002] During cardiopulmonary bypass surgery, although the heart stops beating actively and all the blood in the body is drained into the cardiopulmonary bypass machine through the superior and inferior vena cava, a large amount of blood still accumulates in the left ventricle. In order to prevent the left ventricle from expanding and to create a good surgical field, it is necessary to aspirate the blood from the left ventricle.

[0003] Existing technology relates to an automatic pressure relief adjustment device for a left ventricular drainage tube, specifically in the field of medical device technology. This device includes a Y-shaped connecting pipe, with an elastic gasket, a rotating shaft, and a micro motor inside. A first indicator light is also located outside the connecting pipe. The connecting pipe also includes a pressure acquisition module, an infrared sensing module, a storage module, a processing module, and a control module, overcoming the problem of automatic pressure adjustment within the tubing in existing left ventricular drainage systems.

[0004] However, during cardiac surgery, it is difficult to observe whether the blood inside the left ventricle has been completely aspirated using the aforementioned and existing left ventricular drainage tubes. Once the blood inside the left ventricle has been completely aspirated, the continuous negative pressure generated by the negative pressure aspiration device may cause suction wall phenomenon, thereby damaging the tissues of the left ventricle. At the same time, large tissues such as thrombi in the blood can easily block the drainage tube, which will also lead to an increase in negative pressure inside the drainage tube, making aspiration difficult and even damaging the left ventricle. Summary of the Invention

[0005] This application provides a left ventricular drainage tube that can solve the problems of difficulty in sensitively detecting whether the blood inside the left ventricle has been completely aspirated and the safety hazards to the left ventricle caused by the continuous increase of negative pressure in the drainage tube.

[0006] The technical solution of this application is as follows: a left ventricular drainage tube, comprising: A drainage tube, one end of which is provided with a hollow suction head; The suction head includes an inner core and an elastic support. The inner core has suction ports spaced apart along its circumference on its side. The elastic support is sleeved on the outside of the suction head and can expand and contract with changes in the internal and external pressure difference of the suction head. The elastic support has elastic openings whose opening degree changes with its own expansion and contraction. Distance sensing devices are provided at both ends of the elastic support to monitor the internal and external pressure difference of the suction head based on the expansion and contraction of the elastic support.

[0007] By adopting the above solution, by setting a retractable elastic support on the outside of the suction head, when the drainage tube draws in air, the negative pressure inside the suction head decreases, thereby reducing the pressure difference. At this time, the elastic support can be stretched, and the distance sensing device can sense the increase in the distance between the two ends of the elastic support and act accordingly, thereby issuing a warning signal or turning off the negative pressure suction device through the control module, thus overcoming the problem of difficulty in real-time detection of whether the blood inside the left ventricle has been completely suctioned. When the suction port becomes blocked or the negative pressure inside the suction head increases due to the suction wall phenomenon, the elastic support retracts. The distance sensor can detect the retraction of the elastic support and send a control signal to stop the negative pressure suction device, thus preventing excessive negative pressure inside the suction head from damaging the left ventricle. At the same time, the elastic support, which is sleeved on the outside of the suction head, can also provide a certain amount of support and fastening force to prevent the suction head from deforming.

[0008] In one embodiment of this application, a flexible skin is further included, which is sleeved on the outside of the suction head, and the surface of the flexible skin has liquid inlets that correspond one-to-one with the suction port positions.

[0009] By adopting the above scheme and setting a flexible skin on the outside of the elastic support, the suction head can adapt to the displacement of the elastic support after entering the left ventricle, and the friction and scraping caused to the left ventricle can be reduced.

[0010] In one embodiment of this application, an end cap is further included. The end cap has a recessed cavity inside. A limiting ring is coaxially sleeved on the outside of one end of the suction head near the drainage tube, and the other end is slidably sealed with the end cap. The other end of the suction head has a through hole and communicates with the recessed cavity of the end cap through the through hole.

[0011] By adopting the above scheme, a sliding sealed 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 move according to the change of negative pressure inside the suction head, thereby enabling the device to operate according to the change of pressure difference inside and outside the suction head, so as to facilitate the detection and judgment of blood aspiration in the left ventricle.

[0012] In one embodiment of this application, the elastic support includes a columnar spring, the gap on the elastic support forms the elastic opening, a sliding ring is slidably connected to the outside of the suction head, the sliding ring is connected and fixed to the inner wall of the end cap, one end of the elastic support is connected and fixed to the sliding ring, the other end is connected and fixed to the limiting ring, and the other end of the suction head is in communication with the end cap.

[0013] By adopting the above scheme, by setting columnar springs and setting the rigidity of columnar springs, i.e. elastic force, when the device is normally aspirating blood, the suction negative pressure is greater than the hydraulic damping and less than the elastic force of the columnar springs. At this time, the gap between the columnar springs, i.e. the elastic opening, can allow blood to pass through normally. At the same time, the rigidity of the columnar springs themselves can also support the flexible skin to a certain extent and prevent large volumes of tissue from entering the drainage tube. In addition, when a large volume of tissue blocks the aspiration port, the negative pressure inside the suction head continues to increase. At this time, the column spring will contract, so that the elastic opening becomes smaller until it closes. This can also prevent large volume of tissue from entering the drainage tube due to the increased negative pressure to a certain extent. It can also prevent the left ventricle from being sucked at the aspiration port due to the continuously increasing negative pressure, thus protecting the myocardial tissue of the left ventricle.

[0014] In one embodiment of this application, the distance sensing device includes: Magnetic column, at least two magnetic columns are provided, and the magnetic columns are fixedly assembled to the end face of the end cap near the drainage tube; A linear Hall effect chip is provided, at least two of which are fixedly mounted on the limiting ring. The linear Hall effect chip is located on the side of the limiting ring near the end cap, and the positions of the linear Hall effect chip and the magnetic post correspond one-to-one.

[0015] By adopting the above scheme, and by setting up a magnetic column and a linear Hall chip, the good penetration of magnetic force and the sensitivity of the linear Hall chip to changes in magnetic force are utilized to convert the action of the end cap into an electrical signal and transmit it to the control module of the negative pressure suction device. This allows the device to replace manual labor in detecting and judging the blood suction situation inside the left ventricle.

[0016] In one embodiment of this application, a magnetic stabilizer is further included, the magnetic stabilizer comprising: The first magnetic strip, having at least two, is fixedly mounted on the end face of the end cap near the drainage tube. The second magnetic strip, at least two of which are provided, is fixedly mounted on the side of the limiting ring near the end cap. The positions of the first magnetic strip and the second magnetic strip correspond one-to-one, and the first magnetic strip and the second magnetic strip are attracted to each other by magnetism.

[0017] By adopting the above scheme, when the negative pressure inside the drainage tube increases, the end cap moves towards the drainage tube and compresses the elastic support. At this time, the first magnetic strip on one side of the end cap gradually approaches the second magnetic strip, thereby increasing the magnetic attraction between the two. By utilizing the mutual attraction between the first and second magnetic strips, the opening of the elastic opening can be effectively prevented from fluctuating due to the negative pressure fluctuation, so that the elastic opening is more stable when it is closed.

[0018] In one embodiment of this application, a plurality of elastic damping rings are coaxially arranged on the inner wall of the end cap near the drainage tube, and a wavy damping gap is provided between the plurality of elastic damping rings and the elastic support member to reduce the speed of the end cap when it moves on the suction head.

[0019] By adopting the above scheme, by setting an elastic damping ring on the inner wall of the end cap, a damping gap is formed between the elastic damping ring and the elastic support as the end cap approaches the drainage tube. Then, by utilizing the hydraulic damping of the blood in the damping gap, the device can absorb the high-frequency vibration that the end cap may generate between the spring force and the suction force when it is under critical negative pressure, that is, when the spring support is compressed to the critical point of closure, thus improving stability.

[0020] In one embodiment of this application, an elastic outer skin is also included, wherein the elastic support member is provided with the elastic outer skin along its own length direction.

[0021] By adopting the above solution, by setting an elastic outer skin on the outside of the elastic support, the elastic outer skin can increase the tightness of the elastic openings when the elastic support contracts to close, thereby improving the sealing performance of the suction port.

[0022] In one embodiment of this application, a mechanical stabilizer is further included, the mechanical stabilizer comprising: A fixing post, one end of which is coaxially fixedly connected to the inner wall of the end cap, and the other end is fixedly connected to an elastic ball; A retaining ring assembly, comprising a connecting frame and a retaining ring, wherein the connecting frame is fixedly connected to the inner wall of the through hole at one end of the suction head, and the retaining ring is connected and fixedly connected to the connecting frame, and the diameter of the retaining ring is smaller than the diameter of the elastic ball.

[0023] By adopting the above scheme, when the negative pressure inside the drainage tube increases, the end cap moves towards the drainage tube and compresses the elastic support. At this time, the elastic ball can be squeezed and deformed under the action of the pressure difference inside and outside the end cap, and then get stuck inside the retaining ring, making the elastic opening more stable when closed.

[0024] The second objective of this invention is to provide a left ventricular drainage component.

[0025] The technical solution is as follows: A left ventricular drainage assembly includes a left ventricular drainage tube and a connector, wherein the connector is coaxially connected and fixed to the other end of the drainage tube, and the connector is connected to a negative pressure suction device.

[0026] By adopting the above scheme, the left ventricular drainage tube is connected to the negative pressure suction device using a connector, thereby enabling the negative pressure suction device to stably and continuously create an effective negative pressure inside the drainage tube, so as to smoothly suction blood from the left ventricle.

[0027] In summary, this application includes at least one of the following beneficial technical effects: by setting an elastic support and connecting the elastic support to the end cap, and simultaneously setting the end cap to slide and seal on the outside of one end of the suction head, when the negative pressure inside the suction head changes due to external factors, the end cap can move according to the pressure difference formed by the blood pressure and the internal negative pressure, thereby driving the elastic support to extend and retract. Thus, when the negative pressure inside the drainage tube increases, the elastic opening of the elastic support can be closed, preventing large volumes of tissue from entering the drainage tube. At the same time, the rigidity of the elastic support itself can also prevent the suction head from moving due to the increased negative pressure, thereby reducing the possibility of damage to the left ventricle.

[0028] By combining the elastic support with a distance sensing device, the end cap can sense whether it is moving closer to or further away from the drainage tube by sensing the change in magnetic force between the magnetic column and the linear Hall chip when it moves. Based on the distance change, the device can determine the working status of the suction head in aspirating blood into the left ventricle and control the negative pressure suction device. This can prevent the suction head from drawing blood into the left ventricle without reaching the walls, and can also block the suction port when the suction head becomes blocked, thus preventing further damage to the left ventricle.

[0029] By setting a magnetic stabilizer between the end cap and the limiting ring, and utilizing the attraction force between the first and second magnetic strips, the end cap can maintain stability when it presses the columnar spring under pressure difference. This prevents the end cap from vibrating due to negative pressure fluctuations inside the suction head, thereby improving the stability of the device.

[0030] By setting 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, the blood can have greater hydraulic damping in the damping gap, thereby slowing down the movement speed of the end cap, improving the stability of the device under special circumstances, and thus improving the safety of the device. Attached Figure Description

[0031] Figure 1This is a front sectional view of a left ventricular drainage tube provided in the first embodiment of this application; Figure 2 This is a three-dimensional exploded view of a left ventricular drainage tube provided in the first embodiment of this application; Figure 3 This is a perspective view of a flexible skin for a left ventricular drainage tube provided in the first embodiment of this application; Figure 4 This is a front sectional view of a suction head for a left ventricular drainage tube provided in the first embodiment of this application; Figure 5 This is the book Figure 4 An enlarged schematic diagram of part A in the middle; Figure 6 This is a perspective view of a left ventricular drainage tube end cap provided in the first embodiment of this application; Figure 7 This is a three-dimensional exploded view of a magnetic stabilizing component for a left ventricular drainage tube provided in the second embodiment of this application; Figure 8 This is a three-dimensional exploded view of an elastic damping ring for a left ventricular drainage tube provided in the third embodiment of this application; Figure 9 This is a schematic cross-section of an elastic support for a left ventricular drainage tube provided in the first embodiment of this application; Figure 10 This is a planar sectional view of a mechanical stabilizing component for a left ventricular drainage tube provided in the fourth embodiment of this application; Figure 11 This is a perspective view of a mechanical stabilizing component for a left ventricular drainage tube provided in the fourth embodiment of this application; Figure 12 This is a planar sectional view of a left ventricular drainage assembly provided in the first embodiment of this application; Figure 13 This is a perspective view of a left ventricular drainage component connector provided in the first embodiment of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Drainage tube; 2. Suction head; 21. Inner core; 211. Suction port; 22. Elastic support; 221. Elastic outer skin; 222. Elastic opening; 23. Flexible skin; 231. Liquid inlet; 24. End cap; 241. Recessed cavity; 242. Elastic damping ring; 25. Limiting ring; 26. Sliding ring; 3. Distance sensing device; 31. Magnetic column; 32. Linear Hall chip; 4. Magnetic stabilizer; 41. First magnetic strip; 42. Second magnetic strip; 5. Mechanical stabilizer; 51. Fixing column; 52. Elastic ball; 53. Snap ring assembly; 531. Connecting frame; 532. Snap ring; 6. Connecting head. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-13This application provides a further detailed description of a left ventricular drainage tube and a left ventricular drainage assembly.

[0034] The embodiments of this application provide a left ventricular drainage tube, including a drainage tube 1.

[0035] In Example 1, one end of the drainage tube 1 is provided with a hollow suction head 2. The suction head 2 includes an inner core 21 and an elastic support 22. The inner core 21 has suction ports 211 spaced apart along its circumference on its side. The elastic support 22 is sleeved on the outside of the suction head 2 and can expand and contract with the change of the internal and external pressure difference of the suction head 2. The elastic support 22 has an elastic opening 222 whose opening changes with its own expansion and contraction. Distance sensing devices 3 are provided at both ends of the elastic support 22. The internal and external pressure difference of the suction head 2 can be monitored according to the expansion and contraction of the elastic support 22. By setting an expandable elastic support 22 on the outside of the suction head 2 and using the distance sensing devices 3 to sense the movement of the elastic support 22, a warning signal is issued or the negative pressure suction device is shut down through the control module. In addition, the elastic support 22 can also provide a certain supporting and fastening force and block the suction ports 211, so as to avoid deformation of the suction head 2 and prevent the formation of suction walls.

[0036] The drainage tube 1 can also be equipped with a retaining ring on the outside. The retaining ring is used to adjust the position of the drainage tube 1 for suspension and fixation according to the actual needs of the scenario.

[0037] It also includes a flexible skin 23, which is sleeved on the outside of the suction head 2. The surface of the flexible skin 23 has liquid inlets 231 that correspond one-to-one with the position of the suction port 211. By setting the flexible skin 23 on the outside of the elastic support 22, the friction and scraping of the suction head 2 on the left ventricle can be reduced.

[0038] In this embodiment, the flexible skin 23 can be medical-grade silicone.

[0039] It also includes an end cap 24, which has a recessed cavity 241 inside. A limiting ring 25 is coaxially sleeved on the outside of one end of the suction head 2 near the drainage tube 1, and the other end is slidably sealed with the end cap 24. The other end of the suction head 2 has a through hole, which communicates with the recessed cavity 241 of the end cap 24. By setting a slidingly sealed end cap 24 at the end of the suction head 2, the end cap 24 can move according to the change of pressure difference inside and outside the suction head 2, so as to facilitate the detection and judgment of blood aspiration in the left ventricle.

[0040] The suction head 2 has an annular shoulder on its outer side near the end of the drainage tube 1. The annular shoulder and the limiting ring 25 can be coaxially connected and fixed by a riveting process.

[0041] The elastic support 22 includes a columnar spring, and the gap on the elastic support 22 forms the elastic opening 222. A sliding ring 26 is slidably connected to the outside of the suction head 2. The sliding ring 26 is connected and fixed to the inner wall of the end cap 24. One end of the elastic support 22 is connected and fixed to the sliding ring 26, and the other end is connected and fixed to the limiting ring 25. The other end of the suction head 2 is connected to the end cap 24. By utilizing the rigidity of the columnar spring, when the device is normally aspirating blood, the suction negative pressure is greater than the hydraulic damping and less than the elastic force of the columnar spring. At this time, the elastic opening 222 can allow blood to pass through normally. The rigidity of the columnar spring itself can also support the flexible skin 23 to a certain extent, and can also prevent large-volume tissue from entering the drainage tube 1. In the event of blockage, the elastic opening 222 is closed to protect the myocardial tissue of the left ventricle.

[0042] In this embodiment, the column spring can be a medical-grade stainless steel component.

[0043] The distance sensing device 3 includes: a magnetic column 31 and a linear Hall chip 32. At least two magnetic columns 31 are provided and are fixedly mounted on the end face of the end cap 24 near the drainage tube 1. At least two linear Hall chips 32 are provided and are fixedly mounted on the limiting ring 25. The linear Hall chip 32 is located on the side of the limiting ring 25 near the end cap 24. The positions of the linear Hall chip 32 and the magnetic column 31 correspond one-to-one. By setting up the magnetic column 31 and the linear Hall chip 32, and utilizing the good penetration of magnetic force and the sensitivity of the magnetic force change of the linear Hall chip 32, the movement of the end cap 24 can be converted into an electrical signal, so that the device can detect and judge the blood aspiration situation inside the left ventricle.

[0044] In this embodiment, a signal transmission wire is pre-embedded in the wall of the drainage tube 1. One end of the wire is connected to the Hall chip 32, and the other end extends to the end of the drainage tube 1 to connect with an external device.

[0045] In this embodiment, the linear Hall chip 32 employs three levels of insulation protection: The first step involves vapor-depositing a layer of Parylene C on the surface of the linear Hall chip 32 and the solder joint. The second stage involves completely encapsulating the linear Hall chip 32 within the groove on the limiting ring 25 using epoxy resin or UV adhesive. The third stage employs a secondary injection molding process to ensure that the outer wall material of the limiting ring 25 completely covers the setting area of ​​the linear Hall chip 32, forming a seamless and continuous insulating interface to comply with the IEC 60601-1 standard.

[0046] It also includes an elastic outer skin 221, which is provided on the outside of the elastic support member 22 along its own length direction. By providing an elastic outer skin 221 on the outside of the elastic support member 22, the elastic outer skin 221 can increase the tightness of the elastic openings 222 when they are closed together.

[0047] In this embodiment, the elastic outer skin 221 may be a medical rubber component.

[0048] The second objective of this invention is to provide a left ventricular drainage component.

[0049] The technical solution is as follows: A left ventricular drainage assembly includes a left ventricular drainage tube and a connector 6. The connector 6 is coaxially connected and fixed to the other end of the drainage tube 1. The connector 6 is connected to a negative pressure suction device. By using the connector 6 to connect the left ventricular drainage tube 1 to the negative pressure suction device, the negative pressure suction device can stably and continuously suction blood from the left ventricle.

[0050] Example 2 is basically the same in structure as Example 1. The difference is that, in order to improve the stability of the elastic opening 222 when it is closed, the following features are used: It also includes a magnetic stabilizer 4, which includes a first magnetic strip 41 and a second magnetic strip 42. At least two first magnetic strips 41 are provided and fixedly assembled on the end face of the end cap 24 near the drainage tube 1. At least two second magnetic strips 42 are provided and fixedly assembled on the side of the limiting ring 25 near the end cap 24. The positions of the first magnetic strip 41 and the second magnetic strip 42 correspond one-to-one. The first magnetic strip 41 and the second magnetic strip 42 are attracted by magnetism. By utilizing the attraction force between the first magnetic strip 41 and the second magnetic strip 42, the opening degree of the elastic opening 222 can be effectively prevented from fluctuating due to negative pressure fluctuations, making the elastic opening 222 more stable when closed.

[0051] Example 3 is basically the same in structure as Example 1, except that, in order to appropriately reduce the speed at which the end cap moves, the difference is as follows: Multiple elastic damping rings 242 are coaxially arranged on the inner wall of the end cap 24 near the drainage tube 1. A wavy damping gap is provided between the multiple elastic damping rings 242 and the elastic support member 22 to reduce the speed of the end cap 24 when it moves on the suction head 2. By setting the elastic damping rings 242 on the inner wall of the end cap 24 and using the hydraulic damping between the elastic damping rings 242 and the elastic support member 22, the high-frequency vibration that the end cap 24 may generate is absorbed, thereby improving stability.

[0052] In this embodiment, the elastic damping ring 242 may be a medical rubber component.

[0053] Example 4 has the same basic structure as Example 1, but differs in that it improves the stability of the elastic opening 222 when closed. It also includes a mechanical stabilizer 5, which includes a fixing post 51 and a retaining ring assembly 53. One end of the fixing post 51 is coaxially fixed to the inner wall of the end cap 24, and the other end is fixedly connected to an elastic ball 52. The retaining ring assembly 53 includes a connecting frame 531 and a retaining ring 532. The connecting frame 531 is fixedly connected to the inner wall of the through hole at one end of the suction head 2. The retaining ring 532 is connected and fixed to the connecting frame 531. The diameter of the retaining ring 532 is smaller than the diameter of the elastic ball 52. When the negative pressure inside the drainage tube 1 increases, the elastic ball 52 can be inserted into the retaining ring 532 under the action of the pressure difference inside and outside the end cap 24, thereby making the elastic opening 222 more stable when closed.

[0054] In this embodiment, the elastic ball 52 may be a medical rubber component.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A left ventricular drainage tube, characterized in that, include: A drainage tube (1) is provided at one end with a hollow suction head (2); The suction head (2) includes an inner core (21) and an elastic support (22). The inner core (21) has suction ports (211) spaced apart along its circumference on its side. The elastic support (22) is sleeved on the outside of the suction head (2) and can extend and retract with the change of the internal and external pressure difference of the suction head (2). The elastic support (22) has an elastic opening (222) whose opening changes with its own extension and retraction. The elastic support (22) has distance sensing devices (3) at both ends to monitor the internal and external pressure difference of the suction head (2) according to the extension and retraction of the elastic support (22).

2. The left ventricular drainage tube according to claim 1, characterized in that: It also includes a flexible skin (23), which is sleeved on the outside of the suction head (2), and the surface of the flexible skin (23) has liquid inlets (231) that correspond one-to-one with the position of the suction port (211).

3. A left ventricular drainage tube according to claim 2, characterized in that: It also includes an end cap (24), which has a recessed cavity (241) inside. The suction head (2) is coaxially fitted with a limiting ring (25) at one end near the drainage tube (1), and the other end is slidably sealed with the end cap (24). The other end of the suction head (2) has a through hole and communicates with the recessed cavity (241) of the end cap (24) through the through hole.

4. A left ventricular drainage tube according to claim 3, characterized in that: The elastic support (22) includes a columnar spring. The gap on the elastic support (22) forms the elastic opening (222). The suction head (2) is coaxially slidably connected to a sliding ring (26). The sliding ring (26) is connected and fixed to the inner wall of the end cap (24). One end of the elastic support (22) is connected and fixed to the sliding ring (26), and the other end is connected and fixed to the limiting ring (25). The other end of the suction head (2) is connected to the end cap (24).

5. A left ventricular drainage tube according to claim 4, characterized in that, The distance sensing device (3) includes: Magnetic column (31), at least two magnetic columns (31) are provided, and the magnetic column (31) is fixedly assembled on the end face of the end cap (24) near the drainage tube (1); Linear Hall chip (32), at least two of the linear Hall chip (32) are provided, the linear Hall chip (32) is fixedly mounted on the limiting ring (25), the linear Hall chip (32) is located on the side of the limiting ring (25) near the end cover (24), and the position of the linear Hall chip (32) corresponds one-to-one with the position of the magnetic post (31).

6. A left ventricular drainage tube according to claim 5, characterized in that, It also includes a magnetic stabilizer (4), which comprises: The first magnetic strip (41) is provided in at least two parts and is fixedly assembled on the end face of the end cap (24) near the drainage tube (1); The second magnetic strip (42) is provided in at least two. The second magnetic strip (42) is fixedly mounted on the side of the limiting ring (25) near the end cap (24). The positions of the first magnetic strip (41) and the second magnetic strip (42) correspond one-to-one. The first magnetic strip (41) and the second magnetic strip (42) are attracted by each other.

7. A left ventricular drainage tube according to claim 5, characterized in that: Multiple elastic damping rings (242) are coaxially arranged on the inner wall of the end cap (24) near the drainage tube (1). A wave-shaped damping gap is provided between the multiple elastic damping rings (242) and the elastic support (22) to reduce the speed of the end cap (24) when it moves on the suction head (2).

8. A left ventricular drainage tube according to claim 4, characterized in that: It also includes an elastic outer skin (221), which is provided on the outside of the elastic support (22) along its own length direction.

9. A left ventricular drainage tube according to claim 4, characterized in that, It also includes a mechanical stabilizer (5), which comprises: A fixing post (51) is fixedly connected at one end to the inner wall of the end cap (24) on an axial basis, and an elastic ball (52) is fixedly connected at the other end. The retaining ring assembly (53) includes a connecting frame (531) and a retaining ring (532). The connecting frame (531) is fixedly connected to the inner wall of the through hole at one end of the suction head (2). The retaining ring (532) is connected and fixed to the connecting frame (531). The diameter of the retaining ring (532) is smaller than the diameter of the elastic ball (52).

10. A left ventricular drainage assembly, characterized in that: Includes a left ventricular drainage tube and a connector (6) as described in any one of claims 1-9, wherein the connector (6) is coaxially connected and fixed to the other end of the drainage tube (1), and the connector (6) is connected to a negative pressure suction device.

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