Cardiac assist system and perfusion device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MINIMALLY INVASIVE SURGERY MEDICAL TECH (SHANGHAI) CO LTD
- Filing Date
- 2021-12-30
- Publication Date
- 2026-06-02
Smart Images
Figure CN116407752B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, and in particular to a cardiac assist system and perfusion device. Background Technology
[0002] Percutaneous coronary intervention (PCI) is a commonly used and effective treatment for coronary artery disease. During PCI, the patient's heart is often in an unstable beating state, and a cardiac assist device is usually implanted in the heart to assist the heart's pumping action.
[0003] To prevent blood from entering the bearings and motor of a cardiac assist device (CAD), perfusion fluid is typically injected into the CAD to prevent potential blood damage. Traditional CAD perfusion systems generally use a motor that drives a piston in a pump via a transmission mechanism, pushing fluid forward and drawing it back. However, existing perfusion techniques carry certain risks. Although a one-way valve prevents backflow during suction and a pressure regulator slows the rapid drop in pressure during suction, the regulator's performance is limited. During suction, the pressure drop cannot be completely avoided, increasing the risk of blood entering the CAD's bearings and motor, and significantly raising the risk of hemolysis. Summary of the Invention
[0004] Therefore, it is necessary to provide a cardiac assist system and perfusion device to address the potential blood damage caused by traditional cardiac assist devices.
[0005] An infusion device includes a drive unit, a transmission mechanism, and at least two infusion devices. Each infusion device includes an infusion chamber and a piston located within the infusion chamber. The piston rod of the piston extends from one end of the infusion chamber, and the other end of the infusion chamber is provided with an infusion port and a suction port. The infusion port is used to communicate with a cardiac assist device, and the suction port is used to communicate with a liquid container. The piston rods of all the infusion devices are connected to the transmission mechanism. The drive unit is connected to the transmission mechanism and is used to simultaneously drive at least one of the infusion devices to be in an infusion state and at least one of the remaining infusion devices to be in a suction state.
[0006] In one embodiment, the perfusion device further includes a pressure regulator disposed on the connecting line between the infusion device and the cardiac assist device;
[0007] The voltage regulator includes a voltage regulating chamber and a voltage regulating piston located within the voltage regulating chamber. The voltage regulating piston divides the voltage regulating chamber into a gas chamber and a liquid chamber. The gas chamber is provided with an air inlet, through which compressed gas is pre-stored. The liquid chamber is provided with a liquid inlet and a liquid outlet. The liquid inlet is connected to the liquid inlet of the injector, and the liquid outlet is connected to the cardiac assist device.
[0008] In one embodiment, the pressure-stabilizing piston includes a sealing movable part and a limiting part. The outer periphery of the sealing movable part contacts and seals the inner wall of the pressure-stabilizing chamber. The limiting part is connected to the sealing movable part and is located inside the liquid chamber and has a certain length in the axial direction of the liquid chamber.
[0009] In one embodiment, the voltage regulator further includes a plug and a gas check valve, the gas check valve being disposed at the air inlet, and the plug being plugged at the air inlet end of the gas check valve.
[0010] In one embodiment, a pressure transmitter is provided on the connecting line between the infusion device and the cardiac assist device, and the pressure transmitter is located upstream of the voltage regulator according to the direction of the infusion fluid flow; the pressure transmitter is electrically connected to the control unit of the drive.
[0011] In one embodiment, the infusion device further includes a connecting member and at least two first liquid check valves. The injection ports of all the injectors are respectively connected to different inlets of the connecting member, and the outlet of the connecting member is connected to the connecting pipeline. The first liquid check valves are respectively disposed on the sub-pipelines between the injection ports of the injectors and the inlets of the connecting member.
[0012] In one embodiment, the infusion device further includes at least two second liquid check valves, which are respectively disposed on the suction line between the liquid inlet of the injector and the liquid container.
[0013] In one embodiment, the perfusion device further includes an air filter disposed on the connecting line between the outlet of the pressure regulator and the cardiac assist device.
[0014] In one embodiment, the infusion device includes two of the injection devices.
[0015] The transmission mechanism includes a gear and two parallel racks. The two racks are respectively connected to one of the piston rods, and both racks mesh with the gear. The gear is connected to the driving member.
[0016] or,
[0017] The transmission mechanism includes a lead screw and two nut structures. The lead screw has two threaded sections with opposite thread directions. The two nut structures are respectively disposed on the two threaded sections. The driving component is connected to the lead screw, and the two piston rods are connected to the two nut structures in a one-to-one correspondence.
[0018] A cardiac assist system includes a cardiac assist device and a perfusion device for continuously perfusing the cardiac assist device.
[0019] When the aforementioned cardiac assist system and perfusion device are in use, the drive unit is activated, which drives the transmission mechanism to move. The transmission mechanism simultaneously drives at least two infusion tubes, so that while one infusion tube injects fluid into the cardiac assist device, the other infusion tube draws fluid from the liquid container. This alternating pushing of fluid ensures that perfusion fluid is always injected into the cardiac assist device, achieving continuous and stable perfusion. This stabilizes the perfusion fluid pressure and prevents blood from entering the cardiac assist device, effectively reducing blood damage to the motor and bearings of the cardiac assist device and lowering the risk of hemolysis. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of a cardiac assist system according to an embodiment of this application;
[0021] Figure 2 This is a schematic diagram of the voltage regulator of an infusion device according to an embodiment of this application;
[0022] Figure 3 for Figure 2 A cross-sectional schematic diagram;
[0023] Figure 4 This is a schematic diagram of a cardiac assist system according to another embodiment of this application.
[0024] Explanation of icon numbers:
[0025] 10. Liquid container; 20. Drive component; 30. Transmission mechanism; 310. Gear; 320. Rack; 330. Lead screw; 340. Nut structure; 40. Injector; 410. Injection chamber; 420. Piston rod; 51. First liquid check valve; 52. Second liquid check valve; 60. Connecting component; 70. Pressure transmitter; 80. Pressure regulator; 810. Pressure regulating chamber; 812. Gas chamber; 8122. Air inlet; 814. Liquid chamber; 8142. Liquid inlet; 8144. Liquid outlet; 820. Pressure regulating piston; 822. Sealing moving part; 824. Limiting part; 830. Gas check valve; 840. Plug; 90. Air filter; 100. Cardiac assist device; 110. Control unit. Detailed Implementation
[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "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 do not 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.
[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0032] Reference Figure 1 One embodiment of this application provides a cardiac assist system, including a cardiac assist device 100 and a perfusion device. The cardiac assist device 100 is used to assist the heart in pumping blood percutaneously during PCI surgery. The perfusion device is used to continuously perfuse fluid into the cardiac assist device 100 to prevent blood from entering the cardiac assist device 100 and causing blood damage, thereby reducing the risk of hemolysis.
[0033] Reference Figure 1 One embodiment of this application provides an infusion device, including a drive member 20, a transmission mechanism 30, and at least two infusion devices 40. Each infusion device 40 includes an infusion chamber 410 and a piston located within the infusion chamber 410. The piston rod 420 of the piston extends from one end of the infusion chamber 410, and the other end of the infusion chamber 410 is provided with an infusion port and a suction port. The infusion port is used to communicate with a cardiac assist device 100, and the suction port is used to communicate with a liquid container 10. The piston rods 420 of all the infusion devices 40 are connected to the transmission mechanism 30. The drive member 20 is connected to the transmission mechanism 30 and is used to simultaneously drive at least one infusion device 40 to be in an infusion state and at least one of the remaining infusion devices 40 to be in a suction state.
[0034] The drive unit 20 is activated, driving the transmission mechanism 30 to move. The transmission mechanism 30 simultaneously drives at least two infusion pumps 40, ensuring that at least one infusion pump 40 injects fluid into the cardiac assist device 100 while at least another infusion pump 40 draws fluid from the liquid container 10. The at least two infusion pumps 40 can alternately push fluid, ensuring that there is always perfusion fluid injected into the cardiac assist device 100, achieving continuous and stable perfusion. This stabilizes the perfusion fluid pressure, preventing blood from entering the cardiac assist device 100, effectively reducing damage to the blood inside the motor and near the bearings of the cardiac assist device 100, and lowering the risk of hemolysis. Moreover, the perfusion device in this embodiment can use a single drive unit 20 and transmission structure to drive the piston rods 420 of at least two infusion pumps 40. Compared to perfusion methods achieved through peristaltic pumps, this reduces the overall size of the perfusion device, facilitating a simplified design of the cardiac assist system.
[0035] Optionally, refer to Figure 1 In this embodiment, there are two infusion injectors 40. The transmission mechanism 30 includes a gear 310 and two parallel racks 320. Each of the two racks 320 is connected to a piston rod 420, and both racks 320 mesh with the gear 310. The gear 310 is connected to the drive member 20. In this embodiment, the drive member 20 is a motor. The motor drives the gear 310 to rotate, and the gear 310 meshes with the two parallel racks 320. The power is transmitted to the two piston rods 420 of the infusion injector 40 through the two racks 320, causing the two piston rods 420 to move relative to each other, so that one infusion injector 40 draws liquid and the other infusion injector 40 pushes liquid. When one infusion injector 40 draws liquid from the liquid container 10, the other infusion injector 40 discharges liquid into the heart assist device 100. Therefore, regardless of whether the gear 310 rotates clockwise or counterclockwise, there is always an injector 40 pushing the fluid, thereby ensuring the continuity of the perfusion fluid entering the human body through the cardiac assist device 100 and preventing blood from entering the cardiac assist device 100 and causing blood damage.
[0036] Alternatively, in other embodiments, the transmission mechanism 30 may also be other structures capable of realizing relative movement between the two piston rods 420, such as a lead screw and nut structure with double threads, see reference. Figure 4 The lead screw 330 has two threaded sections with opposite thread directions. A motor drives the lead screw to rotate, and two nut structures 340 located on the two threaded sections move towards or away from each other. Two piston rods are connected to the two nut structures 340 in a one-to-one correspondence, thus enabling relative movement between the two piston rods. The lead screw and nut structures are located between the two piston rods, and the lead screw 330 is arranged parallel to the two piston rods. The piston rods and nut structures 340 are connected via a connector perpendicular to the piston rods, thereby driving the piston rods to move along the axial direction of the lead screw 330.
[0037] Furthermore, in one embodiment, the infusion device further includes a connecting member 60, wherein the injection ports of all the injectors 40 are respectively connected to different inlets of the connecting member 60, and the liquid ejected from each injector 40 flows to the cardiac assist device 100 through the outlet of the connecting member 60. In this embodiment, the connecting member 60 is a three-way structure.
[0038] Optionally, the number of injectors 40 can be three, four, or other configurations depending on actual needs. For example, the motor can adopt a dual-output shaft structure, simultaneously driving two gears 310 to rotate. Each gear 310 meshes with two parallel racks 320, thereby simultaneously driving two injectors 40 to draw in liquid and two injectors 40 to push liquid. Alternatively, the motor can adopt a single-output shaft with two gears spaced upwards. Each gear 310 meshes with two parallel racks 320, and each rack 320 is connected to a piston rod, thereby simultaneously driving two injectors 40 to draw in liquid and two injectors 40 to push liquid. Correspondingly, the connecting member 60 can adopt a five-way structure or other multi-way structures.
[0039] Furthermore, in one embodiment, the infusion device further includes at least two second liquid one-way valves 52, which are respectively disposed on the connecting pipe between the suction port of the infuser 40 and the liquid container 10. The second liquid one-way valves 52 on the connecting pipe through which the infuser 40 draws liquid ensure that liquid can only flow from the liquid container 10 to the infuser 40 via the second liquid one-way valves 52, preventing backflow and ensuring the unidirectional flow of liquid. All liquid expelled by the infuser 40 flows into the cardiac assist device 100, further ensuring the continuity of the infusion fluid entering the human body through the cardiac assist device 100.
[0040] Furthermore, in one embodiment, the perfusion device further includes at least two first liquid one-way valves 51, which are respectively disposed on the connecting pipe between the injection port of the injector 40 and the inlet of the connecting member 60. The first liquid one-way valves 51 on the connecting pipe through which the injector 40 pushes the liquid ensure that the liquid can only flow from the injector 40 to the cardiac assist device 100 via the first liquid one-way valves 51, preventing backflow and ensuring the unidirectional flow of the liquid. This ensures that the injector 40 can only draw liquid from the liquid container 10 during the aspiration process, further guaranteeing the continuity of the perfusion fluid entering the human body through the cardiac assist device 100.
[0041] Furthermore, in one embodiment, the perfusion device further includes a pressure transmitter 70, which is disposed on the connecting pipeline between the infusion pump 40 and the cardiac assist device 100. Specifically, according to the perfusion fluid flow direction, the pressure transmitter 70 is disposed downstream of the connecting member 60. The perfusion fluid pushed out by the infusion pump 40 passes through the connecting member 60 and then through the pressure transmitter 70, which is electrically connected to the control unit 110 of the drive member 20. The pressure in the connecting pipeline for pushing the fluid is monitored in real time by the pressure transmitter 70 (such as a pressure sensor) and the signal is transmitted to the control unit 110 at a certain frequency. Through a certain judgment algorithm, when the pressure exceeds the normal range, the control unit 110 will issue a pressure abnormality alarm. The control unit 110 can control the speed of pushing and drawing fluid by the infusion pump 40 by controlling the rotation direction and speed of the motor (i.e., the aforementioned drive member), thereby adjusting the flow rate of the perfusion fluid to the cardiac assist device 100.
[0042] Furthermore, in one embodiment, the infusion device further includes a pressure regulator 80. The pressure regulator 80 is disposed on the connecting line between the infusion pump 40 and the cardiac assist device 100. Specifically, in this embodiment, along the fluid infusion direction, the pressure regulator 80 is disposed downstream of the pressure transmitter 70. Optionally, in other embodiments, the positions of the pressure regulator 80 and the pressure transmitter 70 can be interchanged, i.e., the fluid flows through the pressure regulator 80 first and then through the pressure transmitter 70. When the pressure in the connecting line for fluid delivery drops rapidly, for example, when the infusion pump 40 stops pushing fluid and loses its infusion power, but the cardiac assist device 100 is still inside the body, this situation may occur when the infusion fluid needs to be replaced. Figure 1 When the liquid container 10 on the left needs to be replaced, the infusion process must be paused. Thanks to the pressure stabilizing performance of the pressure regulator 80, the pressure at the end of the infusion line remains at a certain level, providing a certain liquid pressure. This can prevent the risk of blood entering the bearings and motor during this short period, thus mitigating damage to the human blood to some extent. However, the risk of hemolysis is also significantly increased.
[0043] Specifically, refer to Figure 2 , 3 In one embodiment, the voltage regulator 80 includes a voltage regulating chamber 810 and a voltage regulating piston 820 located within the voltage regulating chamber 810. The voltage regulating piston 820 divides the voltage regulating chamber 810 into a gas chamber 812 and a liquid chamber 814. The gas chamber 812 is provided with an air inlet 8122, through which compressed gas is pre-stored. The liquid chamber 814 is provided with a liquid inlet 8142 and a liquid outlet 8144. The liquid inlet 8142 is connected to the liquid inlet of the injector 40, and the liquid outlet 8144 is connected to the cardiac assist device 100.
[0044] Furthermore, in one embodiment, the voltage regulator 80 further includes a plug 840 and a gas check valve 830. The gas check valve 830 is disposed at the air inlet 8122, and the plug 840 blocks the air inlet end of the gas check valve 830. The gas check valve 830 ensures that the gas in the gas chamber 812 cannot be discharged from the air inlet 8122, ensuring the airtightness of the gas chamber 812, and at the same time ensuring the voltage regulation performance of the voltage regulator 80.
[0045] In operation, the gas chamber 812 contains air, and the liquid chamber 814 contains liquid. The inflow and outflow directions of the liquid are as follows: Figure 3 As shown by the middle arrow. A gas check valve 830, such as a duckbill valve, is installed inside the air inlet 8122 of the gas chamber 812. The gas check valve 830 has the following airflow direction: Figure 2 As shown by the middle arrow. The other end of the gas check valve 830 is connected to the plug 840. The working principle is as follows: Before the pressure regulator 80 is connected to the connecting line with the cardiac assist device, the upper plug 840 is opened, and air is introduced into the gas chamber through the air inlet of the gas check valve 830, causing the pressure regulating piston 820 to move downward. At this time, no liquid has been introduced into the liquid chamber 814, and both the gas chamber 812 and the liquid chamber 814 are filled with air. The pressure in the gas chamber 812 is not lower than the pressure in the liquid chamber 814. When the pressure regulating piston 820 moves downward to a certain position and stops moving, the air continues to be introduced, which can continuously increase the gas pressure in the gas chamber 812. Then the plug 840 is screwed on. At this time, liquid with a certain gauge pressure is introduced into the liquid chamber 814 of the pressure regulator 80. When the liquid pressure is higher than the air pressure in the gas chamber 812, the pressure regulating piston 820 will move upward under the action of the pressure difference until the pressure in the gas chamber 812 and the liquid chamber 814 reach equilibrium. At this time, the air in the gas chamber 812 is further compressed, and the pressure in the gas chamber 812 is equal to the liquid pressure in the liquid chamber 814. When the injector 40 needs to be paused, the pressure in the liquid-pushing connecting pipe decreases, falling below the pressure of the compressed air in the gas chamber 812 above the pressure regulator 80. At this time, the pressure regulating piston 820 moves downward under the action of the pressure difference, pushing a portion of the liquid in the connecting pipe into the blood, preventing blood from entering the cardiac assist device 100. The working principle of the pressure regulator 80 is equivalent to a passive pressure head buffer unit: it stores pressure head when the injector 40 is working and releases pressure head when the injector 40 is paused.
[0046] The voltage regulator 80 in this embodiment uses the compression and expansion of air within a sealed chamber to maintain pressure, without relying on the deformation of elastic materials, thus avoiding the risk of failure caused by fatigue and aging of elastic materials. The molar amount of air can be adjusted according to actual needs.
[0047] Furthermore, referring to Figure 3In one embodiment, the pressure-stabilizing piston 820 includes a sealing movable part 822 and a limiting part 824. The outer periphery of the sealing movable part 822 contacts and seals against the inner wall of the pressure-stabilizing chamber 810. The limiting part 824 is connected to the sealing movable part 822, and is located within the liquid chamber 814 and has a certain length in the axial direction of the liquid chamber. The outer periphery of the sealing movable part 822 contacts and seals against the inner wall of the pressure-stabilizing chamber 810, dividing the pressure-stabilizing chamber 810 into a gas chamber 812 and a liquid chamber 814 that are not connected to each other. Optionally, a sealing ring is fitted around the outer periphery of the sealing movable part 822 to further ensure that the outer periphery of the sealing movable part 822 contacts and seals against the inner wall of the pressure-stabilizing chamber 810. When there is a pressure difference between the gas chamber 812 and the liquid chamber 814, the sealing movable part 822 can move along the inner wall of the pressure-stabilizing chamber 810 towards the side with lower pressure. The limiting part 824 protrudes from the bottom surface of the sealing movable part 822 and is disposed within the liquid chamber 814. Its function is to limit the lowest position of the pressure stabilizing piston 820, preventing the sealing movable part 822 of the pressure stabilizing piston 820 from moving to the bottom during the gas chamber 812 filling stage. At this time, when the liquid chamber 814 is connected to the connecting pipe, there is a risk of liquid entering the gas chamber 812. During normal filling, when the pressure in the gas chamber 812 is equal to the liquid pressure in the liquid chamber 814, a gap appears between the limiting part 824 and the end of the liquid chamber 814 away from the gas chamber. When the pressure in the connecting pipe for liquid pushing decreases, the compressed air above the pressure stabilizing piston 820 can push the pressure stabilizing piston 820 towards the liquid chamber 814, giving the pressure stabilizing piston 820 room to move; it also avoids blocking the liquid, ensuring that the liquid can pass smoothly through the liquid chamber 814. Optionally, the limiting part 824 has a cylindrical structure.
[0048] Optionally, in one embodiment, a one-way valve can be added upstream of the pressure regulator 80 and connected to the liquid inlet 8142 of the pressure regulator 80. The one-way valve allows the flow direction to be from upstream to downstream of the pressure regulator 80, in order to prevent reverse flow in the downstream liquid path of the pressure regulator 80 and further improve the safety of the filling liquid path.
[0049] Furthermore, in one embodiment, the perfusion device further includes an air filter 90, which is disposed on the connecting pipeline between the outlet 8144 of the pressure regulator 80 and the cardiac assist device 100. After passing through the pressure regulator 80, the perfusion fluid enters the air filter 90 to filter out small air bubbles in the perfusion fluid and prevent them from entering the body. When there are large air bubbles or air columns in the pipeline, it is necessary to disconnect the connection between the perfusion pipeline and the cardiac assist device 100, push the fluid multiple times to expel the air bubbles, and then reconnect the pipeline.
[0050] The infusion device of the above embodiments has at least one of the following beneficial effects:
[0051] 1. The perfusion tubing has a continuous flow of fluid at the end near the human body (i.e., the outlet of the perfusion fluid of the heart assist device) and the fluid pressure remains stable, which effectively reduces blood damage near the bearing inside the motor of the heart assist device 100 and reduces the risk of hemolysis.
[0052] 2. It adopts the principle of injection pump (i.e., injector) and positive volume principle for liquid discharge, with precise flow control.
[0053] 3. A drive unit provides power to two infusion pumps 40, which alternately pump fluid to ensure continuous fluid output. Compared with the existing intermittent perfusion technology, only one infusion pump is added, but continuous and stable perfusion performance is achieved, which limits the intrusion of blood into the heart assist device 100 and thus reduces damage to the human blood.
[0054] 4. The infusion line includes a pressure regulator 80, which maintains pressure by compressing and expanding the air in a sealed chamber. This avoids the risk of failure caused by fatigue and aging of elastic materials, as it does not rely on the deformation of elastic materials. This ensures that the pressure at the end of the infusion line can be temporarily maintained at a certain level, limiting the intrusion of blood into the cardiac assist device 100 and thus mitigating damage to the body's blood.
[0055] 5. The injection pipeline includes a pressure transmitter 70, and the pressure signal is fed back to the control unit 110. The control unit 110 judges the pressure signal and decides whether to issue an alarm signal.
[0056] 6. The control unit 110 controls the rotation speed of the drive component 20 according to the pressure transmitter 70, so as to achieve continuous injection while ensuring injection accuracy and precise control of injection flow rate.
[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. An injection device, characterized in that, The device includes a drive unit, a transmission mechanism, a voltage regulator, and at least two infusion devices. Each infusion device includes an infusion chamber and a piston located within the infusion chamber. The piston rod of the piston extends from one end of the infusion chamber, and the other end of the infusion chamber is provided with an infusion port and a suction port. The infusion port is used to communicate with a cardiac assist device, and the suction port is used to communicate with a liquid container. The piston rods of all the infusion devices are connected to the transmission mechanism. The drive unit is connected to the transmission mechanism and is used to simultaneously drive at least one of the infusion devices to be in the infusion state and at least one of the remaining infusion devices to be in the suction state. The pressure regulator is disposed on the connecting pipeline between the infusion device and the cardiac assist device; the pressure regulator includes a pressure regulating chamber, a plug, a gas one-way valve, and a pressure regulating piston located in the pressure regulating chamber. The pressure regulating piston divides the pressure regulating chamber into a gas chamber and a liquid chamber. The gas chamber has an air inlet, through which compressed gas is pre-stored. The liquid chamber has an inlet and an outlet. The inlet is connected to the infusion port of the infusion device, and the outlet is connected to the cardiac assist device. The gas one-way valve is disposed at the air inlet, and the plug is plugged at the inlet end of the gas one-way valve. The pressure regulating piston includes a sealing movable part and a limiting part. The outer periphery of the sealing movable part contacts and seals the inner wall of the pressure regulating chamber. The limiting part is connected to the sealing movable part and is located in the liquid chamber and has a certain length in the axial direction of the liquid chamber. The infusion device also includes a pressure transmitter, which is installed on the connecting pipeline between the infusion device and the cardiac assist device. The pressure transmitter is electrically connected to the control unit of the drive component. The pressure transmitter is used to monitor the pressure of the connecting pipeline in real time. When the pressure exceeds the normal range, the control unit issues a pressure abnormality alarm and controls the speed of the infusion device to push and draw liquid by controlling the rotation direction and speed of the drive component.
2. The infusion device according to claim 1, characterized in that, The inlet of the voltage regulator is connected to a one-way valve.
3. The infusion device according to claim 1, characterized in that, A sealing ring is fitted around the outer periphery of the sealing movable part.
4. The infusion device according to claim 1, characterized in that, The limiting part is a cylindrical structure.
5. The infusion apparatus according to any one of claims 1-4, characterized in that, The pressure transmitter is located upstream of the voltage regulator, according to the direction of the injection fluid flow.
6. The infusion apparatus according to claim 5, characterized in that, The injection device further includes a connecting member and at least two first liquid check valves. The injection ports of all the injectors are respectively connected to different inlets of the connecting member, and the outlet of the connecting member is connected to the connecting pipeline. The first liquid check valves are respectively disposed on the sub-pipelines between the injection ports of the injectors and the inlets of the connecting member.
7. The infusion device according to claim 5, characterized in that, The infusion device further includes at least two second liquid check valves, which are respectively disposed on the suction line between the liquid inlet of the injector and the liquid container.
8. The infusion apparatus according to any one of claims 2-4, characterized in that, The infusion device also includes an air filter, which is disposed on the connecting pipeline between the outlet of the pressure regulator and the cardiac assist device.
9. The infusion device according to claim 1, characterized in that, The infusion device includes two of the aforementioned injectors; The transmission mechanism includes a gear and two parallel racks. Two piston rods are connected to the two racks in a one-to-one correspondence, and both racks mesh with the gear. The gear is connected to the driving component; or... The transmission mechanism includes a lead screw and two nut structures. The lead screw has two threaded sections with opposite thread directions. The two nut structures are respectively disposed on the two threaded sections. The driving component is connected to the lead screw, and the two piston rods are connected to the two nut structures in a one-to-one correspondence.
10. A cardiac assist system, characterized in that, Includes a cardiac assist device and a perfusion device according to any one of claims 1-9, wherein the perfusion device is used to continuously perfuse the cardiac assist device.