Device and method for removing contrast agent in heart local blood

Abstract

The invention discloses a device and method for removing a contrast agent in heart local blood, and relates to the field of medical treatment, the removing device comprises a suction catheter, a power pump, a filter assembly and a backflow catheter which are connected in sequence; the coronary artery of the heart body is communicated with the angiographic catheter, the coronary sinus of the heart body is communicated with the suction catheter, the femoral vein or other deep veins of a human body are communicated with the backflow catheter, and the area between the coronary artery and the coronary sinus is a contrast agent delivery area; wherein the filtering assembly is used for removing a contrast agent in blood. When the contrast agent in the blood is removed, the blood containing the contrast agent is pumped out of the heart body through the suction catheter by the power pump, then the contrast agent contained in the blood is removed through the filtering assembly, and then the blood without the contrast agent is conveyed into the human body again through the femoral vein or other deep veins by the backflow catheter. By means of the circulating conveying mode, on one hand, contrast agents in blood can be removed, and on the other hand, excessive blood loss of a patient can be avoided.

Description

Technical Field

[0001] This invention relates to the medical field, specifically to a device and method for removing contrast agents from local blood in the heart. Background Technology

[0002] As is generally known, coronary artery disease (CAD) is a heart condition caused by disease of the coronary arteries. The coronary arteries are the main arteries supplying blood to the heart; when these arteries become blocked or narrowed, it leads to myocardial ischemia, which in turn causes CAD. CAD is typically treated with coronary angiography and percutaneous coronary intervention (PCI), which requires the use of large amounts of contrast agent (>100 mL) for vascular visualization. Currently, my country performs over 5 million coronary angiography procedures and approximately 1.3 million PCI procedures annually.

[0003] Contrast agents (also known as contrast agents) are liquids containing iodide ions. Their density is higher than that of surrounding organs and tissues, increasing their effectiveness under X-ray or enhanced CT scans, thus facilitating clear observation of lesions. However, contrast agents flowing into other organs can cause numerous adverse reactions, including chemical toxicity, osmotoxicity, allergic reactions, immune reactions, ion imbalances, liver and kidney damage, and even acute renal failure requiring hemodialysis. Existing research indicates that even small amounts (<30ml) of contrast agent can cause kidney damage, leading to contrast-induced nephropathy. The incidence of contrast-induced nephropathy is generally around 10% to 20%. Furthermore, this probability may be significantly increased in certain patient groups; for example, patients with pre-existing chronic kidney disease or severe renal insufficiency may have an incidence exceeding 50%. Therefore, reducing the toxicity of contrast agents to the human body is a pressing issue.

[0004] For example, the Chinese patent document with authorization announcement number CN205073031U, authorization date of 2016-03-09, and titled "An Auxiliary Removal Device for Magnetic Resonance Imaging Contrast Agent in Patients with Renal Failure," includes: a magnetic adsorption plate, a leg wrap, a first wrap, a second wrap, a first Velcro fastener, and a second Velcro fastener. The magnetic adsorption plate is installed on the leg wrap. There are two first wraps connected to one side of the leg wrap, and two second wraps connected to the other side of the leg wrap. The first Velcro fastener is sewn to the ends of the two first wraps, and the second Velcro fastener is sewn to the ends of the second wraps. The magnetic adsorption plate of the contrast agent auxiliary removal device is aligned with the femoral artery and fastened. Then, the leg wrap, the wrap, and the Velcro fasteners on the wraps are used to wrap the thigh to collect the contrast agent in the body. Finally, the concentrated contrast agent is released from the body by bloodletting. This patent has a simple structure, is easy to use, and can remove the contrast agent from the patient's body, avoiding damage to the kidneys.

[0005] The shortcomings of the aforementioned existing technologies are as follows: Firstly, while removing residual contrast agents through bloodletting involves discarding the blood containing the contrast agent, the heart, as the core organ supplying blood, has a large internal blood flow, and simple bloodletting can easily cause excessive blood loss in patients. Secondly, the contrast agents used in MRI are magnetically sensitive and can be removed by magnetic adsorption technology, but the contrast agents used in coronary angiography are iodine contrast agents, which are not magnetically sensitive and cannot be removed by this method. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for removing contrast agents from local blood in the heart, so as to overcome the above-mentioned shortcomings in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A device for removing contrast agents from local blood in the heart includes an aspiration catheter, a power pump, a filter assembly, and a return catheter connected in sequence.

[0009] The coronary arteries of the heart body are connected to the angiography catheter, the coronary sinus of the heart body are connected to the aspiration catheter, the femoral vein or other deep veins of the human body are connected to the return catheter, and the area between the coronary arteries and the coronary sinus is the contrast agent delivery area;

[0010] The filter component is used to remove contrast agents from the blood.

[0011] In the aforementioned device for removing contrast agents from local blood in the heart, the pump draws blood at a speed greater than or equal to the speed at which blood flows within the heart.

[0012] The aforementioned device for removing contrast agents from local blood in the heart also includes an automatic control mechanism, the control logic of which is set to activate the power pump 1-10 seconds after the contrast agent is administered.

[0013] The aforementioned device for removing contrast agents from local blood in the heart also includes a temperature control component on the reflux catheter.

[0014] The aforementioned device for removing contrast agents from local blood in the heart includes a thrombus detection component on the reflux catheter.

[0015] The aforementioned device for removing contrast agents from local blood in the heart also includes a bubble detection component on the reflux catheter.

[0016] The aforementioned device for removing contrast agents from local blood in the heart includes a heparinization component on the aspiration catheter.

[0017] The aforementioned device for removing contrast agents from local blood in the heart includes an adaptive adjustment mechanism on the aspiration catheter for adjusting the internal pressure of the aspiration catheter. The adaptive adjustment mechanism includes a first housing, a second housing inside the first housing, a buffer cavity between the first housing and the second housing, the internal space of the second housing communicating with the internal space of the aspiration catheter, an adjustment plate dynamically sealed on the second housing, and a first spring between the adjustment plate and the inner wall of the first housing.

[0018] The above-mentioned device for removing contrast agents from local blood in the heart includes an adjustment plate with a first through hole, a sliding plate slidably disposed within the first through hole, a second spring disposed between the sliding plate and the first through hole, and a transmission part disposed on the sliding plate, the transmission part extending into the internal space of the second housing.

[0019] A method for removing contrast agents from local blood in the heart involves delivering the contrast agent into the heart body via the coronary artery, then drawing blood from the heart body through the coronary sinus and removing the contrast agent from the blood via a filtration assembly before returning it to the body via the femoral vein or other deep veins, wherein the area between the coronary artery and the coronary sinus is the contrast agent delivery area.

[0020] In the above technical solution, the present invention provides a device for removing contrast agents from local blood in the heart. This device comprises a suction catheter, a power pump, a filter assembly, and a return catheter connected in sequence. The coronary arteries of the heart are connected to the contrast catheter, the coronary sinuses of the heart are connected to the suction catheter, and the femoral vein or other deep veins are connected to the return catheter. When removing contrast agents from the blood, the power pump draws blood containing contrast agents from the heart through the suction catheter. The filter assembly then removes the contrast agents from the blood. Finally, the return catheter returns the blood, free of contrast agents, to the body through the femoral vein or other deep veins. This cyclical delivery method removes contrast agents from the blood while preventing excessive blood loss in the patient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the blood flow process provided in an embodiment of the present invention;

[0023] Figure 2This is a schematic diagram of the connection structure between the power pump and the adaptive adjustment mechanism provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the first housing structure provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of the first housing structure provided in another embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure when the first baffle is in the second position, according to another embodiment of the present invention.

[0027] Figure 6 This is a cross-sectional view of the first housing from another perspective, as provided in another embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the connection structure between the first baffle and the transmission part according to another embodiment of the present invention;

[0029] Figure 8 This is a schematic cross-sectional view of the first housing structure provided in another embodiment of the present invention;

[0030] Figure 9 for Figure 4 Enlarged schematic diagram of a local structure at point A;

[0031] Figure 10 for Figure 8 Enlarged schematic diagram of the local structure at point B.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Suction catheter; 2. Power pump; 3. Filter assembly; 4. Return catheter; 5. Heparinization assembly; 6. Thrombosis detection assembly; 7. Temperature control assembly; 8. Adaptive adjustment mechanism; 9. First housing; 10. Second housing; 11. Buffer chamber; 12. Adjustment plate; 13. First spring; 14. Connecting hole; 15. First through hole; 16. Slide plate; 18. Second spring; 19. Transmission unit; 20. Clearance groove; 21. First baffle. ; 22. Second through hole; 23. Support; 24. First locking rod; 25. Third spring; 26. Second locking rod; 27. U-shaped groove; 28. Second baffle; 29. ​​Fourth spring; 30. Abutment part; 31. Connecting shaft; 32. First abutment rod; 33. Second abutment rod; 34. Lifting groove; 35. Limiting block; 36. Heart body; 37. Sealing part; 38. Sealing groove; 39. Bubble detection assembly; 40. Angiography catheter. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] In the description of this invention, it should be understood that the terms "center," "length," "width," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Reference Figure 1-10 This invention provides a device for removing contrast agents from local blood in the heart, comprising a suction catheter 1, a power pump 2, a filter assembly 3, and a return catheter 4 connected in sequence; the coronary artery of the heart body 36 is connected to the contrast catheter 40, the coronary sinus of the heart body 36 is connected to the suction catheter 1, the femoral vein or other deep veins of the human body are connected to the return catheter 4, and the area between the coronary artery and the coronary sinus is the contrast agent delivery area; wherein, the filter assembly 3 is used to remove contrast agents from the blood.

[0037] Specifically, after the interventional procedure, a leg wrap, a bandage, and Velcro on the bandage are used to wrap the thigh to collect the contrast agent. Then, the collected contrast agent is released from the body by bloodletting after being attracted by a magnetic adsorption plate at the collection site. This is existing technology and will not be elaborated further. However, when removing contrast agent from inside the heart body 36, different contrast agents cannot be collected using magnetic adsorption. Furthermore, since the heart body 36 is the core blood-supplying organ with a large internal blood flow, simple bloodletting can easily cause excessive blood loss. One of the core innovations of this invention is that by setting up a sequentially connected aspiration catheter 1, power pump 2, filter assembly 3, and return catheter 4, the coronary arteries of the heart body 36 are connected to the contrast catheter 40, and the coronary sinus of the heart body 36 is connected to the aspiration catheter 1. The vein or other deep vein is connected to the return catheter 4. The angiography catheter 40, the aspiration catheter 1, and the return catheter 4 are all flexible tubes. The power pump 2 can be either a centrifugal pump or a hydraulic pump, which provides the power required for blood flow. The filter assembly 3 is either a filter element or a filter membrane, which only allows blood to pass through. The coronary artery-coronary sinus is the area for contrast agent delivery. Valves or other structures for controlling blood flow can be installed on the aspiration catheter 1. The purpose of this arrangement is that when removing contrast agent from the blood, the power pump 2 draws blood containing contrast agent from the heart body 36 through the aspiration catheter 1, then the filter assembly 3 removes the contrast agent from the blood, and then the return catheter 4 returns the blood without contrast agent to the body through the femoral vein or other deep veins. Through this circulatory delivery, the contrast agent in the blood can be removed on the one hand, and excessive blood loss in the patient can be avoided on the other hand.

[0038] In another embodiment of the present invention, the pump 2 draws blood at a speed greater than or equal to the speed at which blood flows in the heart body 36. For example, the pump 2 draws blood at a speed of 250 ml / min, while the blood flow in the heart body 36 is 200 ml / min. The advantage of this setting is that the pump 2 drawing blood at a speed 50 ml / min higher than the blood flow in the heart body 36 will not have a significant impact on the patient's body. However, the faster pump 2 draws blood at a speed that increases the clearance rate of the contrast agent and reduces the extravasation of the contrast agent into the systemic circulation, thereby improving the treatment effect.

[0039] As another embodiment of the present invention, an automatic control mechanism (not shown in the figure) is also included. The control logic of the automatic control mechanism is set to turn on the power pump 2 1-10 seconds after the contrast agent is completely injected. The purpose of this setting is that the time for the contrast agent to flow in the blood vessel plus the time for the power pump 2 to turn on is used by doctors to observe the condition of the blood vessels through the contrast agent.

[0040] When blood flows out of the heart body 36, the blood temperature drops. When the cold blood flows back into the heart body 36, it can cause discomfort to the patient. As another embodiment of the present invention, the return conduit 4 is also provided with a temperature control component 7. Specifically, in the direction of blood flow, the temperature control component 7 is located behind the filter component 3. The temperature control component 7 is preferably a combination of a thermometer and an electric heating wire. When the thermometer detects that the blood temperature is low, the electric heating wire heats the blood, thereby controlling the blood temperature.

[0041] In another embodiment of the present invention, a thrombus detection component 6 is provided on the reflux conduit 4. Specifically, in the direction of blood flow, the thrombus detection component 6 is located between the filter component 3 and the temperature control component 7. The thrombus detection component 6 can be a coagulation analyzer, which is used to detect whether there are thrombi in the blood flowing into the human body, so as to reduce the probability of complications caused by thrombi.

[0042] As another embodiment of the present invention, the reflux conduit 4 is further provided with a bubble detection component 39. Specifically, in the blood flow direction, the bubble detection component 39 is located between the filter component 3 and the temperature control component 7. The bubble detection component 39 is preferably a bubble counter, which detects and counts bubbles by means of an optical sensor or an acoustic sensor. It is used to detect whether there are bubbles in the blood flowing into the human body.

[0043] In another embodiment of the present invention, the aspiration catheter 1 is provided with a heparinization component 5. Specifically, the heparinization component 5 is used to inject heparin into the blood to fully inhibit the blood clotting function without causing spontaneous bleeding. This is prior art and will not be described in detail.

[0044] As another embodiment of the present invention, the aspiration catheter 1 is further provided with an adaptive adjustment mechanism 8 for adjusting the internal pressure of the aspiration catheter 1. Specifically, the adaptive adjustment mechanism 8 can be a piston and pressure gauge cooperation structure. A branch tube is provided on the aspiration catheter 1, and the piston and the inner wall of the branch tube are dynamically sealed. When the internal pressure of the aspiration catheter 1 is too high, the piston is controlled to move away from the central axis of the aspiration catheter 1 by existing reciprocating drive components such as cylinders, thereby increasing the area of ​​communication between the branch tube and the aspiration catheter 1, allowing some blood to enter the interior of the branch tube, so as to reduce the internal pressure of the aspiration catheter 1 and achieve the function of pressure relief.

[0045] As an alternative to the aforementioned piston and pressure gauge for pressure relief, preferably, the adaptive adjustment mechanism 8 includes a first housing 9, inside which a second housing 10 is disposed. A buffer cavity 11 is constructed between the first housing 9 and the second housing 10. The internal space of the second housing 10 communicates with the internal space of the suction conduit 1. An adjustment plate 12 is dynamically sealed on the second housing 10. A first spring 13 is disposed between the adjustment plate 12 and the inner wall of the first housing 9. Specifically, the first housing 9 is preferably either a cylinder or a square cylinder. The second housing 10 has a hollow area communicating with the suction conduit 1, and this hollow area is coaxial with the suction conduit 1. A connection hole 14 communicating with the buffer cavity 11 is opened on the second housing. A sliding groove is opened on the side wall of the connection hole 14. The adjustment plate 12 is dynamically sealed to the sliding groove. The adjustment plate 12 is an arc-shaped plate. One end of the first spring 13 is fixed to the surface of the adjustment plate 12 away from the central axis of the suction conduit 1, and the other end is fixed to... On the inner wall of the first housing 9, the force exerted by the first spring 13 when it deforms is less than the force required to support the suction catheter 1 and the blood vessel. The purpose of this arrangement is that when the pressure inside the suction catheter 1 and the second housing 10 (since the hollow areas inside the suction catheter 1 and the second housing 10 are connected, hereinafter referred to as the pressure inside the suction catheter 1) is greater than the force required to deform the first spring 13, it will push the adjusting plate 12 to slide away from the central axis of the suction catheter 1, and squeeze the air inside the first spring 13 and the buffer chamber 11, and make the space inside the second housing 10 larger, so as to buffer the pressure inside the suction catheter 1 and achieve the effect of passive pressure relief. When the pressure inside the suction catheter 1 returns to the normal value, that is, when the sum of the elastic force of the first spring 13 and the air pressure inside the buffer chamber 11 is greater than the pressure of the liquid inside the suction catheter 1, the adjusting plate 12 moves towards the central axis of the suction catheter 1 to achieve the automatic reset of the adjusting plate 12.

[0046] It should be noted that at the instant the power pump 2 or the valve closes, a water hammer effect will occur inside the suction tube 1 (this refers to the phenomenon in a closed pipeline system where a sudden change in fluid flow causes a large pressure fluctuation and vibration; when an open valve is suddenly closed, due to the smooth pipe wall, the subsequent water flow quickly reaches its maximum under the action of inertia, and the water flow will exert pressure on the power pump 2 (or valve) and the pipe wall). This causes blood to impact the power pump 2, and the resulting reaction force will cause the blood inside the suction tube 1 to flow back, thus affecting the suction... Increased pressure inside the suction catheter 1 and blood vessel can, in severe cases, cause the blood vessel or suction catheter 1 to rupture. To address the water hammer effect, the adjusting plate 12 is further provided with a first through hole 15. A sliding plate 16 is slidably disposed within the first through hole 15, and a second spring 18 is disposed between the sliding plate 16 and the first through hole 15. A transmission part 19 is disposed on the sliding plate 16, extending into the internal space of the second housing 10. Specifically, the first through hole 15 is arranged along the length of the adjusting plate 12, such as... Figure 5 As shown, a clearance groove 20 is provided on the right side wall of the first through hole 15. The slide plate 16 is located inside the first through hole 15, and a connecting part adapted to the clearance groove 20 is provided at the right end of the slide plate 16. The connecting part is slidably connected to the clearance groove 20. The second spring 18 is provided between the connecting part and the side wall of the clearance groove 20. A sealing groove 38 is provided on the left side wall of the first through hole 15. A sealing part 37 is provided at the left end of the slide plate 16, and the sealing part 37 is slidably connected to the sealing groove 38. The transmission part 19 is provided on the end of the slide plate 16 near the sealing part 37 and is obliquely arranged towards the central axis of the suction conduit 1. The purpose of this arrangement is that when the power pump 2 or the valve is closed, the second housing 10 Under the influence of water hammer, the blood between the power pump 2 (or valve) and the pump flows in the opposite direction to the second housing 10. Since the transmission part 19 is obliquely arranged towards the central axis of the suction catheter 1, the blood impacts the transmission part 19, which exerts a rightward force on the transmission part 19 and pushes the transmission part 19, the slide plate 16 and the connecting part to slide to the right, and squeezes the second spring 18 to buffer the force generated by the blood under the water hammer effect, thereby protecting the suction catheter 1 and the blood vessel. When the force generated by the water hammer effect disappears, the elasticity of the second spring 18 is released, thereby driving the slide plate 16 to slide to the left to achieve the automatic reset of the slide plate 16.

[0047] Preferably, the first housing 9 is provided with an arc-shaped surface. Specifically, the arc-shaped surface is provided at the connection position between the first housing 9 and the suction conduit 1. As the adjusting plate 12 slides under the action of the internal pressure of the suction conduit 1, the hollow area inside the second housing 10 will increase, which will cause blood to hit the inner wall of the first housing 9. Since the impact position is set to arc-shaped, the force of blood hitting the inner wall of the first housing 9 can be reduced, making the blood flow more smoothly.

[0048] When the buffering force of the second spring 18 alone is insufficient to resolve the water hammer effect, excess blood needs to be drained from the suction catheter 1 to achieve further buffering. As another embodiment of the invention, such as... Figure 5As shown, a first baffle 21 is rotatably mounted on the slide plate 16, and a first torsion spring (not shown) is provided between the first baffle 21 and the slide plate 16. In this embodiment, the transmission part 19 is disposed on the first baffle 21, and a second through hole 22 is provided on the slide plate 16. The first baffle 21 has a first position for blocking the second through hole 22 and a second position for opening the second through hole 22, and also includes a locking member for fixing the first baffle 21 in the first position. Specifically, the second through hole 22 is arranged along the length direction of the slide plate 16, and the first baffle 21... The slide plate 16 is rotatably positioned on the side near the central axis of the suction catheter 1, and is arranged corresponding to the position of the second through hole 22. The elastic force of the first torsion spring causes the first baffle 21 to tend to swing away from the central axis of the suction catheter 1. The locking member can be a pin or other plug-in structure to fix the position. In this embodiment, the buffer cavity 11 is under negative pressure, but the force exerted by the negative pressure of the buffer cavity 11 on the adjusting plate 12 is less than the force exerted by the elastic force of the first spring 13 on the adjusting plate 12. The purpose of this arrangement is that when the blood is flowing normally, the first baffle 21 is in a horizontal state, and its surface is in contact with the slide plate 16. This seals the second through hole 22, which is the first position of the first baffle 21. When the slide plate 16 slides along the relief groove 20 and squeezes the second spring 18 to its limit but still cannot buffer the impact force brought by the water hammer effect, the locking member closes. At this time, the locking effect of the locking member on the first baffle 21 disappears, and the force of the blood on the transmission part 19 will cause the first baffle 21 to swing towards the central axis of the suction tube 1, thereby opening the second through hole 22. This is the second position of the first baffle 21. The blood inside the suction tube 1 will flow into the buffer chamber 11 through the second through hole 22 to achieve the water hammer effect. Further buffering of force can protect the aspiration catheter 1 and blood vessels. In this process, the buffer chamber 11 has two effects: first, it increases the internal space of the aspiration catheter 1 to buffer the internal pressure of the aspiration catheter 1; second, since the buffer chamber 11 is under negative pressure, it can accelerate the speed at which blood enters the buffer chamber 11 when the second through hole 22 is opened, thereby improving the buffering effect. After the water hammer effect is relieved, the first baffle 21 switches from the second position to the first position under the elastic force of the first torsion spring to realize the automatic reset of the first baffle 21, thereby blocking the second through hole 22 again.

[0049] Furthermore, the locking component includes a bracket 23, on which a first locking rod 24 is slidably disposed, and a third spring 25 is disposed between the first locking rod 24 and the bracket 23. A second locking rod 26 is fixedly connected to the first baffle 21. When the first baffle 21 is in the first position, the first locking rod 24 abuts against the second locking rod 26. When the first baffle 21 is in the second position, the first locking rod 24 is located on the travel stroke of the second locking rod 26. Specifically, the bracket 23 is L-shaped, with one end fixedly connected to the surface of the adjusting plate 12 away from the central axis of the suction conduit 1. A U-shaped groove 27 is formed on the other end of the bracket 23. Horizontal grooves are provided on both sides of the plate. The first locking rod 24 is slidably connected to the horizontal groove. The third spring 25 is disposed between the first locking rod 24 and the U-shaped groove 27. The deformation force of the third spring 25 is less than the deformation force required for the first torsion spring. The first locking rod 24 is also L-shaped, with a wedge-shaped surface provided in the direction close to the central axis of the suction conduit 1. The second locking rod 26 is fixed to the surface of the first baffle 21 away from the central axis of the suction conduit 1, and an arc-shaped segment is provided on the second locking rod 26. The purpose of this arrangement is that when the first baffle 21 is in the first position, the horizontal surface of the first locking rod 24 abuts against the horizontal surface of the arc-shaped segment, cooperating with the surface of the sliding plate 16, so that the first... The baffle 21 cannot rotate, thus stabilizing the first baffle 21 in the first position. When the water hammer effect pushes the slide plate 16 to the right, it will drive the second locking rod 26 to move synchronously. Since the adjusting plate 12 cannot move to the right, that is, the first locking rod 24 cannot move to the right, the second locking rod 26 moves to the right relative to the first locking rod 24. When the second locking rod 26 moves away from the first locking rod 24, it releases its locking effect on the first baffle 21. At this time, when the blood impacts the transmission unit 19, it will drive the first baffle 21 to rotate, so that the first baffle 21 switches from the first position to the second position, so that some of the rebounded blood flows into the buffer chamber 11. When the water hammer effect buffers... After completion, the elastic force of the second spring 18 and the first torsion spring is released synchronously. The second spring 18 pushes the slide plate 16 to move to the left, and the first torsion spring drives the first baffle 21 to rotate in the opposite direction. During the rotation of the first baffle 21, the arc-shaped segment of the second locking rod 26 will abut against the wedge-shaped surface of the first locking rod 24, thereby pushing the first locking rod 24 to slide to the left and squeezing the third spring 25 to avoid collision. After the arc-shaped segment abuts against the wedge-shaped surface of the first locking rod 24, the elastic force of the third spring 25 is released, thereby causing the first locking rod 24 to move in the opposite direction to achieve reset, so that the first locking rod 24 abuts against the horizontal surface of the second locking rod 26, thereby locking the first baffle 21 again.

[0050] In another embodiment of the present invention, a second baffle 28 is slidably disposed on the first housing 9, and a fourth spring 29 is disposed between the second baffle 28 and the first housing 9. An abutment portion 30 is disposed on the second baffle 28. A connecting shaft 31 is rotatably disposed on the second housing 10, and a second torsion spring (not shown in the figure) is disposed between the connecting shaft 31 and the second housing 10. A first abutment rod 32 is disposed on the connecting shaft 31, and the first abutment rod 32 abuts against the abutment portion 30. A second abutment rod 33 is also disposed on the connecting shaft 31. In this embodiment, the connection position between the transmission part 19 and the first baffle 21 is made of an elastic material. The force required for the elastic material to deform is less than the force required for the first spring 13 to deform. The second abutment rod 33 is located on the swing stroke of the transmission part 19. Specifically, as shown... Figure 10As shown, a lifting groove 34 is provided inside the left side wall of the first housing 9. The second baffle 28 is slidably connected to the lifting groove 34. The fourth spring 29 is disposed between the end of the second baffle 28 and the inner wall of the lifting groove 34. The abutment part 30 is disposed on the side of the second baffle 28, and the width of the abutment part 30 is much smaller than the width of the transmission part 19 to reduce its obstruction of the water flow. The first abutment rod 32 and the second abutment rod 33 are both fixed to the outer peripheral surface of the connecting shaft 31. The end of the first abutment rod 32 away from the connecting shaft 31 and the abutment part 30 away from the pump The surface of the suction catheter 1 abuts against the central axis. The elastic force of the second torsion spring causes the first abutment rod 32 to tend to rotate counterclockwise. The fourth spring 29 is in a stretched state, and the force required for the second torsion spring to deform is less than the force required for the fourth spring 29 to deform. A limiting block 35 and other limiting structures are provided at the connection between the transmission part 19 and the first baffle 21 so that the transmission part 19 can only swing counterclockwise. The purpose of this arrangement is that when the flow rate of blood inside the suction catheter 1 is too fast, its impact force on the transmission part 19 increases, and the transmission... The connection point between the transmission part 19 and the first baffle 21 is made of an elastic material, causing the transmission part 19 to swing counterclockwise around the elastic material area and store force in the elastic material. During the swing, its end will abut against the surface of the second abutting rod 33 near the central axis of the suction conduit 1, so that the second abutting rod 33, the connecting shaft 31, and the first abutting rod 32 rotate counterclockwise synchronously. During the rotation of the first abutting rod 32, the abutting part 30 will drive the second baffle 28 to slide outward of the lifting groove 34 and stretch the fourth spring 29. This can partially block the aspiration catheter 1, thereby reducing the blood flow inside the aspiration catheter 1 and achieving the effect of passively regulating the blood flow inside the aspiration catheter 1, so as to protect the heart body 36. When the blood flow inside the aspiration catheter 1 returns to normal, the transmission part 19 rotates in the opposite direction under the elastic force of the elastic material, so that the transmission part 19 and the second abutment rod 33 gradually move away. At this time, the second baffle 28, the abutment part 30, the first abutment rod 32 and the second abutment rod 33 automatically reset under the elastic force of the fourth spring 29.

[0051] It should be noted that there should be no less than one adaptive adjustment mechanism 8, and preferably two. The two adaptive adjustment mechanisms 8 are arranged symmetrically about the central axis of the aspiration catheter 1. During the process of the transmission part 19 moving vertically when the adjustment plate 12 is depressurized, the transmission part 19 will not come into contact with the second abutment rod 33. It will only come into contact with the second abutment rod 33 when the blood drives the transmission part 19 to swing around the elastic material area.

[0052] Another embodiment of the present invention provides a method for removing contrast agents from local blood in the heart. The contrast agent is delivered into the heart body 36 through the coronary artery. Then, the blood of the heart body 36 is drawn from the coronary sinus and the contrast agent is removed from the blood through the filter assembly 3 before being returned to the human body through the femoral vein or other deep veins. The area between the coronary artery and the coronary sinus is the contrast agent delivery area.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for removing contrast agents from local blood in the heart, characterized in that, It includes a suction conduit, a power pump, a filter assembly, and a return conduit connected in sequence; The coronary arteries of the heart body are connected to the angiography catheter, the coronary sinus of the heart body are connected to the aspiration catheter, the femoral vein or other deep veins of the human body are connected to the return catheter, and the area between the coronary arteries and the coronary sinus is the contrast agent delivery area; The filter component is used to remove contrast agents from the blood.

2. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, The pump draws blood at a speed greater than or equal to the speed at which blood flows within the heart.

3. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, It also includes an automatic control mechanism, the control logic of which is set to turn on the power pump 1-10 seconds after the contrast agent is completely dispensed.

4. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, The reflux conduit is also equipped with a temperature control component.

5. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, The reflux catheter is equipped with a thrombus detection component.

6. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, The reflux conduit is also equipped with a bubble detection component.

7. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, The aspiration catheter is equipped with a heparinization component.

8. The device for removing contrast agents from local blood in the heart according to claim 1, characterized in that, The suction conduit is also provided with an adaptive adjustment mechanism for adjusting the internal pressure of the suction conduit. The adaptive adjustment mechanism includes a first housing, a second housing inside the first housing, a buffer cavity between the first housing and the second housing, the internal space of the second housing communicating with the internal space of the suction conduit, an adjustment plate dynamically sealed on the second housing, and a first spring between the adjustment plate and the inner wall of the first housing.

9. The device for removing contrast agents from local blood in the heart according to claim 8, characterized in that, The adjustment plate has a first through hole, a sliding plate is slidably disposed in the first through hole, a second spring is disposed between the sliding plate and the first through hole, and a transmission part is disposed on the sliding plate, the transmission part extending into the internal space of the second housing.

10. A method for removing contrast agents from local blood in the heart, characterized in that, The contrast agent is delivered into the heart through the coronary artery. Then, blood from the heart is drawn from the coronary sinus and filtered to remove the contrast agent before being returned to the body through the femoral vein or other deep veins. The area between the coronary artery and the coronary sinus is the contrast agent delivery area.

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