CN114796850A - Method for controlling the speed of a heart assist system - Google Patents
Method for controlling the speed of a heart assist system Download PDFInfo
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- CN114796850A CN114796850A CN202210179914.3A CN202210179914A CN114796850A CN 114796850 A CN114796850 A CN 114796850A CN 202210179914 A CN202210179914 A CN 202210179914A CN 114796850 A CN114796850 A CN 114796850A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/538—Regulation using real-time blood pump operational parameter data, e.g. motor current
- A61M60/546—Regulation using real-time blood pump operational parameter data, e.g. motor current of blood flow, e.g. by adapting rotor speed
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/135—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel inside a blood vessel, e.g. using grafting
- A61M60/139—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel inside a blood vessel, e.g. using grafting inside the aorta, e.g. intra-aortic balloon pumps
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
- A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/515—Regulation using real-time patient data
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/04—Heartbeat characteristics, e.g. ECG, blood pressure modulation
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- Heart & Thoracic Surgery (AREA)
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Abstract
The application relates to the field of medical equipment, in particular to a method for controlling the speed of a heart assist system, wherein the heart assist system comprises an action system, the action system sets a first target range and a second target range, at least a first operation parameter of the action system and a second operation parameter in a test environment are determined, and the rotating speed value of the action system is measured; when the first operation parameter exceeds the first target range or the second operation parameter exceeds the second target range, calculating according to the first operation parameter and the second operation parameter to obtain an adjustment coefficient, and re-determining the rotating speed of the action system according to the adjustment coefficient.
Description
Technical Field
The present application relates to the field of medical devices, and more particularly to a method for controlling the speed of a heart assist system.
Background
At present, the morbidity and mortality of heart failure are high, which is a significant cause of death of most patients with cardiovascular diseases, and nearly 1.17 million people all over the world suffer from the disease. The heart failure is called heart failure, which means that venous return blood cannot be sufficiently discharged out of the body due to the occurrence of dysfunction of the systolic function or the diastolic function of the heart, so that blood stasis in a venous system and insufficient blood supply in an arterial system are caused, and finally cardiac circulatory system dysfunction is caused. The development process of heart failure is slow, most of the heart failure is caused by that after various symptoms of a patient accumulate for many years, the heart gradually loses the blood pumping function, all the functions are gradually weakened, the heart is enlarged, the left ventricle is enlarged, the life quality and the clinical treatment of the patient are greatly influenced, the existing treatment scheme comprises drug treatment, auxiliary equipment and heart transplantation, but different treatment methods face great challenges.
At present, two treatment schemes of drug treatment and heart failure auxiliary systems are mainly used for treating cardiogenic shock and high-risk PCI. At present, many key parameters (motor rotating speed) of common pump heart failure auxiliary systems (such as ECMO, Impella and the like) in the market are adjusted through manual setting, and the control mode needs medical staff to continuously adjust the parameters according to the physical signs of patients in the actual operation process, so that the operation is complex; some known methods are based on a state which is described statically by a characteristic curve on the premise of a steady state, i.e. the dependence of, for example, the pump rotational speed, the pump drive power and the force or similar quantities acting on a rotor which guides the blood in the axial direction, and the weaknesses of such methods are, on the one hand, the fact that the blood viscosity is difficult to determine per se and must be measured accordingly by means of a separate intervention on the patient, and such models do not describe the behavior of the pump in changing or switching states.
Patent CN201780040840.2 discloses a method for determining, in particular for estimating, operating parameters of a blood pump (1) comprising a rotor (5) conveying blood, wherein a behavior variation of at least one first and one second operating parameter of the blood pump, independent of each other, is determined, and wherein the determined behavior variation of at least two of the operating parameters is taken into account in determining a flow rate through the blood pump and/or a pressure difference across the blood pump and/or a blood viscosity, which solution has the technical drawback that: blood pump rotational speed can constantly change at operation in-process, and for the rotational speed of adjusting the blood pump, the motor current of blood pump can increase or reduce, but if not monitor the current value or do not restrict upper limit current, can lead to the motor to generate heat and influence the motor life-span, burns out the motor even, influences the stability in use and the security of blood pump.
Therefore, aiming at the limitation of the current similar products in the market in parameter control, those skilled in the art are dedicated to develop a method for controlling the speed of the heart assist system, and mainly solve the following problems: the heart assist system cannot adaptively adjust the rotating speed along with the change of the aortic blood flow and the change of the working current of the action system.
Disclosure of Invention
The present application has been made in view of the above and other more general considerations.
One of the objectives of the present application is to overcome the deficiencies of the prior art, and to provide a method for controlling the speed of a heart assist system for the purpose of adaptively adjusting the rotation speed of the heart assist system according to the changes of the aortic blood flow and the operating current of the motion system.
According to another aspect of the application, a method for controlling the speed of a heart assist system is provided, the heart assist system comprising an action system, wherein at least a first operating parameter of the action system and a second operating parameter in a test environment are determined, and a rotational speed value of the action system is measured, a calculation is performed based on the first operating parameter and the second operating parameter to obtain an adjustment factor, and the rotational speed of the action system is re-determined based on the adjustment factor.
According to one embodiment, the motion system sets a first target range and a second target range, and the rotational speed of the motion system is adjusted when the first operating parameter exceeds the first target range or the second operating parameter exceeds the second target range.
According to an embodiment, the operating system sets a safety parameter, and the operating system is immediately shut down if the first operating parameter exceeds the safety parameter.
According to another embodiment, the operating system sets a safety parameter and the operating system is shut down if the second operating parameter exceeds the safety parameter.
According to one embodiment, at least an operating current value I of the moving system is measured as a first operating parameter, and a rate of change of the current value I over time is determined.
According to an embodiment, at least the blood flow L in the test environment is measured as a second operating parameter, and the rate of change of the blood flow L over time is determined.
According to one embodiment, the action system also sets a safety current
When the current I of the action system exceeds the safety current
When the system is closed, the action system is closed immediately.
According to an embodiment, the first target range is a target current range comprising an upper current threshold
And lower current threshold
And when the working current value I exceeds the target current range, the rotating speed of the action system is adjusted immediately.
According to an embodiment, the second target range is a target flow range, the target flow range including an upper flow threshold
And lower flow threshold
And when the blood flow L exceeds the target flow range, the rotating speed of the action system is adjusted immediately.
According to an embodiment, the motion system can work at the current rotation speed only when two conditions that the blood flow L is within the target flow range and the working current value I of the motion system is within the target current range are simultaneously met, so that the purpose of adaptively adjusting the rotation speed of the motion system is fulfilled.
According to an embodiment, in order to adjust the rotation speed of the motion system, an adjustment coefficient t must be determined, and the new rotation speed of the motion system is obtained by multiplying the adjustment coefficient t by the current rotation speed value of the motion system; the rotation speed of the operating system is stabilized to a fixed value after adaptive adjustment.
According to one embodiment, in addition to determining the first operating parameter and the second operating parameter, at least a first adjustment parameter is determined for determining the adjustment factor
The second adjustment parameter
Upper limit of blood flow
Lower limit flow threshold of blood flow
And the upper limit current of the operating system
。
According to an embodiment, the adjustment coefficient t is calculated by
。
According to an embodiment, the first adjustment parameter
And the second adjustment parameter
The following conditions are satisfied:
+
=1。
according to another aspect of the application, a heart auxiliary system is provided, which comprises an action system, a control system, a feedback signal acquisition system and a man-machine interaction system, wherein the feedback signal acquisition system comprises a Hall sensor for acquiring a current value I of the action system, a flow acquisition system for acquiring an aortic blood flow L and an electrocardiosignal acquisition device for acquiring an electrocardiosignal of a patient, and the control system adjusts the rotating speed of the action system according to the current value I and the blood flow L of the feedback signal acquisition system.
According to one embodiment, the man-machine interaction system comprises a touch display screen, a rotary encoder and a button, wherein the touch display screen is matched with the rotary encoder to set the initial speed of the action system, and a target flow range is set on the touch display screen.
According to an embodiment, an Electrocardiogram (ECG) signal collected by the ECG signal collector is displayed on the touch display screen; when the rotating speed of the action system runs for a period of time at a certain fixed rotating speed and the electrocardiogram ECG signal collected by the ECG signal collector is normal, the touch display screen can display the elastic frame information to prompt the action system to withdraw from the body.
According to one embodiment, the action system comprises a motor, a conduit, a bracket and a blade, the rotating speed of the blade is controlled by the motor, and the control system controls the rotating speed of the motor; and the bracket, the catheter and the motor are sequentially arranged from the far end to the near end, and the bracket is sleeved outside the paddle.
According to an embodiment, the flow collection system comprises a pressure sensor arranged on the catheter to measure aortic pressure, the flow collection system calculating aortic blood flow L from aortic pressure.
According to an embodiment, the first adjustment parameter
=0.5, the second adjustment parameter
=0.5。
According to an embodiment, the first adjustment parameter
=0.4, the second adjustment parameter
=0.6。
According to an embodiment, the first adjustment parameter
And the first adjustment parameter
Set by the action system default.
According to an embodiment, the first adjustment parameter
And the first adjustment parameter
No adjustments are made during the operation of the motion system.
According to another embodiment, the first adjustment parameter may be adjusted during operation of the motion system
And the first adjustment parameter
Adjustments are made.
According to another embodiment, to determine the adjustment factor, the blood viscosity is also measured.
According to another embodiment, for determining the adjustment factor, an average speed of the moving system is also determined.
According to one embodiment, the human-computer interaction system is used for setting relevant parameters of the heart assist system, and after the action system enters the heart and is fixed at the target position, the upper limit flow threshold value of the blood flow is set on the touch display screen
Lower limit flow threshold of blood flow
And the initial rotational speed of the motor.
According to an embodiment, the safety current
Set by the action system default.
According to an embodiment, the waveform of the electrocardiogram ECG signal can be used as the patient physiological index detection information.
According to one embodiment, once the motion system starts to operate, the flow collection system starts to collect the aortic blood flow and the working current of the motion system of the patient; when the collected aortic blood flow exceeds the target flow range or the working current of the action system is higher than the target current range of the action system, the control system can adaptively adjust the rotating speed of the motor.
According to an embodiment, when the operating current of the motion system is higher than the upper limit current, the motor immediately performs speed reduction processing.
According to one embodiment, when the operating current of the action system is lower than the upper limit current, the motor immediately carries out speed-up processing.
According to an embodiment, the test environment is at the aortic annulus.
According to an embodiment, the test environment is at the ascending aorta.
According to an embodiment, the test environment is the left ventricle.
Compared with the prior art, the technical scheme of the application has the advantages that at least the following steps are included:
1. compared with the prior method for controlling the artificial heart, the invention introduces a method for controlling the speed of a heart auxiliary system, firstly, at least a first operation parameter of an action system and a second operation parameter in a test environment are determined, for the selection of the first motion parameter and the second motion parameter, the invention comprehensively considers the influence of the change of the heart auxiliary system and the test environment on the motion of the heart auxiliary system, and in order to start the self-adaptive adjustment of the rotating speed of the action system, the action system sets a first target range and a second target range, when the collected first operation parameter exceeds the first target range or the second motion parameter exceeds the second target range, the control system can automatically control the rotating speed of the action system without manually adjusting the rotating speed of the action system, the complexity of the operation of the equipment is reduced, thus, the function of automatically adjusting the speed of the heart auxiliary system under the premise of ensuring the stable operation of the action system is realized, and the adjustment mode can gradually stabilize the speed of the action system to a fixed value, is beneficial to the recovery of patients and has great clinical significance.
2. According to one concept of the application, the working current value I of the action system is used as a first operation parameter, the blood flow L in the test environment is used as a second operation parameter, at the moment, the first target range is a target current range, the second target range is a target flow range, when the working current value I exceeds the target current range or the blood flow L exceeds the target flow range, the rotating speed of the action system is immediately adjusted, and only under the condition that the blood flow L and the working current value I do not exceed the ranges, the rotating speed of the action system can be kept at a certain fixed value, the self-adaptive mechanism of the action system ensures the stable operation of the action system in the heart, the blood pumping effect is good, the physiological environment of the heart of a human body is met, and the recovery of a patient is facilitated; on the other hand, the action system also sets a safe current, and once the current of the action system exceeds the safe current, the action system is immediately closed, so that the action system is effectively prevented from being damaged, and the stability and the safety of the action system are ensured.
3. According to one concept of the application, in order to adjust the rotational speed, an adjustment coefficient t must be determined first, and the calculation formula of the adjustment coefficient t is
Wherein, in the step (A),
as a first adjustment parameter, the first adjustment parameter,
in order to set the second adjustment parameter as the second adjustment parameter,
is the upper flow threshold for the blood flow,
is a lower flow threshold for the blood flow,
is the upper limit current of the motion system, and
、
、
、
、
are all provided withThe set fixed value and the adjustment coefficient only need to change according to the change of the blood flow L and the working current value I, so the adjustment coefficient is simple and quick to obtain, and the new rotating speed value of the action system is obtained by multiplying the adjustment coefficient t by the current rotating speed value of the action system, so the rotating speed adjustment reaction of the action system is quick, the sensitivity is high, the matching is good, and in conclusion, the mechanism for adaptively adjusting the rotating speed of the action system can meet and is very suitable for the complex intracardiac environment, and the clinical value is high.
4. According to one concept of the application, the heart auxiliary system comprises an action system, a control system, a feedback signal acquisition system and a man-machine interaction system, wherein the feedback signal acquisition system comprises a Hall sensor for acquiring a current value I of the action system, a flow acquisition system for acquiring an aortic blood flow L and an electrocardiosignal acquisition device for acquiring an electrocardiosignal of a patient, and the control system can adjust the rotating speed of the action system according to the current value I and the blood flow L of the feedback signal acquisition system.
5. According to an idea of this application, electrocardiosignal that the electrocardiosignal collector can gather the patient, and the heart electrograph ECG signal shows on touch display screen, after operating for a period of time with certain fixed rotational speed as operating system's rotational speed and the heart electrograph ECG signal that electrocardiosignal collector gathered is normal, touch display screen can show bullet frame information and withdraw from in order to indicate actuating system, this kind of warning mode is objective intelligence more, save time, and more high-efficient, loaded down with trivial details judgement process has been avoided, go on the man-machine in coordination more thoroughly, it is significant to realize.
Embodiments of the present application are capable of achieving other advantageous technical effects not listed individually, which other technical effects may be described in part below and are anticipated and understood by those of ordinary skill in the art upon reading the present application.
Drawings
The above features and advantages and other features and advantages of these embodiments, and the manner of attaining them, will become more apparent and the embodiments of the application will be better understood by reference to the following description, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a control logic diagram of the method of the present invention for controlling the speed of a heart assist system.
FIGS. 2a 2d are schematic diagrams of the human-computer interaction system and the action system of the present invention
The figures in the drawings refer to the following features:
1-heart assist system, 2-motion system, 21-motor, 22-catheter, 23-bracket, 24-paddle, 3-man-machine interaction system.
Detailed Description
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims.
It is to be understood that the embodiments illustrated and described are not limited in application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The illustrated embodiments are capable of other embodiments and of being practiced or of being carried out in various ways. Examples are provided by way of explanation of the disclosed embodiments, not limitation. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present application without departing from the scope or spirit of the disclosure. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. Accordingly, the disclosure is intended to cover such modifications and variations as fall within the scope of the appended claims and their equivalents.
Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.
The present application will be described in more detail below with reference to various embodiments and examples of several aspects of the application.
In this application, the term "proximal" or "proximal" refers to the end or side closer to the operator, and "distal" or "distal" refers to the end or side farther from the operator.
Example one
As shown in fig. 1, a method for controlling the speed of a heart assist system 1 according to an embodiment of the present application is illustrated, the heart assist system 1 comprising an moving system 2, wherein at least a first operating parameter of the moving system 2 and a second operating parameter in a test environment are determined, a rotational speed value of the moving system 2 is measured, a calculation is performed based on the first operating parameter and the second operating parameter to obtain an adjustment factor, and the rotational speed of the moving system 2 is re-determined based on the adjustment factor.
In the first embodiment, the motion system 2 sets a first target range and a second target range, and when the first operating parameter exceeds the first target range or the second operating parameter exceeds the second target range, the rotation speed of the motion system 2 is adjusted.
In this embodiment one, the operating system 2 sets a safety parameter, and if the first operating parameter exceeds the safety parameter, the operating system 2 is immediately turned off.
In the first embodiment, at least the operating current value I of the motion system 2 is measured as a first operating parameter, and the rate of change of the current value I with time is determined.
In a first embodiment, at least the blood flow L in the test environment is measured as a second operating parameter, and the rate of change of the blood flow L over time is determined.
In the first embodiment, the operating system 2 further sets a safety current
When the current I of the action system 2 exceeds the safety current
The motion system2 is then turned off.
In this embodiment, the first target range is a target current range, and the target current range includes an upper current threshold
And lower current threshold
And when the working current value I exceeds the target current range, the rotating speed of the action system 2 is adjusted immediately.
In this embodiment, the second target range is a target flow range, and the target flow range includes an upper limit flow threshold
And lower flow threshold
When the blood flow L exceeds the target flow range, the rotational speed of the motion system 2 is adjusted.
In the first embodiment, the motion system 2 will operate at the current rotation speed only when two conditions, that is, the blood flow L is within the target flow range and the operating current value I of the motion system 2 is within the target current range, are simultaneously satisfied, so as to achieve the purpose of adaptively adjusting the rotation speed of the motion system 2.
In the first embodiment, in order to adjust the rotation speed of the motion system 2, an adjustment coefficient t must be determined first, and the new rotation speed of the motion system 2 is obtained by multiplying the adjustment coefficient t by the current rotation speed value of the motion system 2; the rotation speed of the operating system 2 is stabilized to a fixed value after adaptive adjustment.
In the first embodiment, in order to determine the adjustment coefficient, in addition to determining the first operating parameter and the second operating parameter, at least a first adjustment parameter needs to be determined
Second adjustmentParameter(s)
Upper limit of blood flow
Lower limit flow threshold of blood flow
And the upper limit current of the operation system 2
。
In the first embodiment, the formula for calculating the adjustment coefficient t is
。
In the first embodiment, the first adjustment parameter
And the second adjustment parameter
The following conditions are satisfied:
+
=1。
in the first embodiment, the heart assist system 1 including the action system 2 further includes a control system, a feedback signal collection system, and a human-computer interaction system 3, as shown in fig. 2a, wherein the feedback signal collection system includes a hall sensor for collecting a current value I of the action system 2, a flow collection system for collecting an aortic blood flow L, and an electrocardiographic signal collector for collecting an electrocardiographic signal of a patient, and the control system adjusts the rotation speed of the action system 2 according to the current value I and the blood flow L of the feedback signal collection system.
In the first embodiment, the human-computer interaction system 3 includes a touch display screen, a rotary encoder and a button, the touch display screen and the rotary encoder are matched to set an initial speed of the action system 2, and a target flow range is set on the touch display screen.
In the first embodiment, the electrocardiogram ECG signal collected by the ECG signal collector is displayed on the touch display screen; when the rotating speed of the action system 2 runs for a period of time at a certain fixed rotating speed and the electrocardiogram ECG signal collected by the ECG signal collector is normal, the touch display screen can display the elastic frame information to prompt the action system 2 to withdraw from the body.
In the first embodiment, the motion system 2 includes a motor 21, a conduit 22, a bracket 23 and a blade 24, the rotational speed of the blade 24 is controlled by the motor 21, and the control system controls the rotational speed of the motor 21; moreover, the bracket 23, the catheter 22 and the motor 21 are sequentially arranged from the distal end to the proximal end, and the bracket 23 is sleeved outside the paddle 24, as shown in fig. 2c and 2 d.
In this embodiment, the flow collection system includes a pressure sensor disposed on the catheter 22 to measure the aortic pressure, and the flow collection system calculates the aortic blood flow L according to the aortic pressure.
In the first embodiment, the first adjustment parameter
=0.5, the second adjustment parameter
=0.5。
In the first embodiment, the first adjustment parameter
And the first adjustment parameter
Set by the action system 2 by default.
In the first embodiment, the first adjustment parameter
And the first adjustment parameter
No adjustment is made during the operation of the moving system 2.
In the first embodiment, the target flow rate range is 3.8-4L/min, and the upper limit current threshold value
0.6A, safe current
The flow rate is 0.7A, the rotating speed of the motor 21 is 25000r/min, when the actually measured flow rate value is 3.9L/min and the current value is 0.65A in the running process of the action system 2, the calculation adjusting system t is 0.96, the rotating speed is reset to 24000r/min, and the minimum adjusting step length of the rotating speed of the action system 2 is 500 r/min.
In the first embodiment, during the operation of the operating system 2, when the actually measured flow rate is 3.7L/min and the current value is 0.45A, the calculation and adjustment system t is 1.2, and the rotation speed is reset to 30000 r/min.
In the first embodiment, in the operation process of the motion system 2, when the actually measured flow value is 4L/min and the current value is 0.7A, the working current reaches the safe current
And directly turning off the power supply of the action system 2 and prompting the occurrence of a fault on the touch display screen.
An exemplary procedure for using and controlling the heart assist system 1 of the first embodiment is as follows:
1. surgically delivering the motion system 2 into the left ventricle via the femoral artery, descending aorta, aortic arch, ascending aorta, aortic valve, as shown in fig. 2b, with the stent 23 supported across the valve;
2. connecting the power supply of the heart assist system 1, and after the start is successful, setting an upper limit flow threshold value of the initial speed and the blood flow of the motor 21 on the touch display screen
And a lower flow threshold
；
3. A button of the man-machine interaction system 3 is pressed to start a motor 21 of the action system 2, and the motor 21 drives a paddle 24 to rotate through the guide pipe 22, so that a blood pumping function is realized;
4. after the action system 2 operates, the feedback signal acquisition system starts to work, acquires the working current of the action system 2, the aortic blood flow and the electrocardio signal of the patient, transmits the acquired data to the control system, and the control system judges the working current and the aortic blood flow of the action system 2 as shown in fig. 1;
5. when the aortic blood flow is out of the set target flow range, the control system adjusts the rotating speed of the motor 21; when the working current I of the action system 2 is higher than the upper limit current
When the motor is started, the control system performs speed reduction processing on the motor 21;
6. when the aortic blood flow of the patient reaches the set target flow and the working current of the action system 2 is lower than the upper limit current threshold, the motor 21 works at the currently set rotating speed, so that the purpose of adaptively adjusting the rotating speed of the motor 21 is achieved;
7. when the motor 21 runs for a period of time at a certain fixed rotating speed and the electrocardiosignals collected by the feedback signal collecting system are normal, the touch display screen can display the bullet frame information to help the medical staff to judge whether the action system 2 can be withdrawn from the body.
The foregoing description of several embodiments of the application has been presented for purposes of illustration. The foregoing description is not intended to be exhaustive or to limit the application to the precise configuration, configurations and/or steps disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention and all equivalents be defined by the following claims.
Claims (17)
1. A method for controlling the speed of a heart assist system, which comprises an moving system, characterized in that at least a first operating parameter of the moving system and a second operating parameter in a test environment are determined, and the value of the rotational speed of the moving system is measured, a calculation is performed on the basis of the first operating parameter and the second operating parameter to obtain an adjustment factor, and the rotational speed of the moving system is redetermined on the basis of the adjustment factor.
2. A method for controlling the speed of a heart assist system as recited in claim 1, wherein the motion system sets a first target range and a second target range, and wherein the rotational speed of the motion system is adjusted when the first operating parameter is outside the first target range or the second operating parameter is outside the second target range.
3. A method for controlling the speed of a heart assist system according to claim 2, characterized in that at least an operating current value I of the moving system is measured as a first operating parameter, and the rate of change of the current value I over time is determined.
4. A method for controlling the speed of a heart assist system according to claim 3 characterized in that at least the blood flow L in the test environment is measured as a second operating parameter and the rate of change of the blood flow L over time is determined.
5. A method for controlling the speed of a heart assist system as in claim 3 wherein the motion system also sets ampsFull current
When the current I of the action system exceeds the safety current
When the system is closed, the action system is closed immediately.
6. A method for controlling the speed of a heart assist system as recited in claim 4, wherein the first target range is a target current range that includes an upper current threshold
And lower current threshold
And when the working current value I exceeds the target current range, the rotating speed of the action system is adjusted immediately.
7. A method for controlling the speed of a heart assist system as recited in claim 6, wherein the second target range is a target flow range that includes an upper flow threshold
And lower flow threshold
And when the blood flow L exceeds the target flow range, the rotating speed of the action system is adjusted immediately.
8. A method for controlling the speed of a heart assist system as recited in claim 7, wherein the motion system operates at the current rotation speed only if the two conditions of the blood flow L within the target flow range and the operating current value I of the motion system within the target current range are satisfied simultaneously, thereby achieving the purpose of adaptively adjusting the rotation speed of the motion system.
9. A method for controlling the speed of a heart assist system as set forth in claim 8, wherein, in order to adjust the rotational speed of the moving system, an adjustment coefficient t must be determined, and the adjustment coefficient t multiplied by the current rotational speed value of the moving system is the new rotational speed of the moving system; the rotation speed of the operating system is stabilized to a fixed value after adaptive adjustment.
10. A method for controlling the speed of a heart assist system as set forth in claim 9 wherein at least a first adjustment parameter is determined in addition to the first and second operating parameters to determine the adjustment factor
The second adjustment parameter
Upper limit of blood flow
Lower limit of blood flow
And the upper limit current of the operating system
。
11. A method for controlling the speed of a heart assist system as recited in claim 10, wherein the adjustment factor t is calculated as
。
12. Method for controlling the speed of a heart assist system according to claim 10 or 11, characterized in that the first adjustment parameter
And the second adjustment parameter
The following conditions are satisfied:
+
=1。
13. a heart auxiliary system for implementing the method of claim 1, which comprises an action system, a control system, a feedback signal acquisition system and a human-computer interaction system, and is characterized in that the feedback signal acquisition system comprises a Hall sensor for acquiring the current value I of the action system, a flow acquisition system for acquiring the aortic blood flow L and an electrocardiosignal acquisition device for acquiring the electrocardiosignal of a patient, and the control system adjusts the rotating speed of the action system according to the current value I and the blood flow L of the feedback signal acquisition system.
14. A heart assist system as set forth in claim 13, wherein: the man-machine interaction system comprises a touch display screen, a rotary encoder and a button, wherein the touch display screen is matched with the rotary encoder to set the initial speed of the action system, and a target flow range is set on the touch display screen.
15. A heart assist system as set forth in claim 14, wherein: the electrocardiogram ECG signal collected by the electrocardiosignal collector is displayed on the touch display screen;
when the rotating speed of the action system runs for a period of time at a certain fixed rotating speed and the electrocardiogram ECG signal collected by the ECG signal collector is normal, the touch display screen can display the elastic frame information to prompt the action system to withdraw from the body.
16. A heart assist system as set forth in claim 13, wherein: the action system comprises a motor, a guide pipe, a bracket and a blade, the rotating speed of the blade is controlled by the motor, and the control system controls the rotating speed of the motor; and the bracket, the catheter and the motor are sequentially arranged from the far end to the near end, and the bracket is sleeved outside the paddle.
17. A heart assist system as set forth in claim 16, wherein: the flow collection system comprises a pressure sensor which is arranged on the catheter to measure the aortic pressure, and the flow collection system calculates the aortic blood flow L according to the aortic pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210179914.3A CN114796850A (en) | 2022-02-25 | 2022-02-25 | Method for controlling the speed of a heart assist system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210179914.3A CN114796850A (en) | 2022-02-25 | 2022-02-25 | Method for controlling the speed of a heart assist system |
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| CN114796850A true CN114796850A (en) | 2022-07-29 |
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ID=82528184
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| CN202210179914.3A Pending CN114796850A (en) | 2022-02-25 | 2022-02-25 | Method for controlling the speed of a heart assist system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024120912A1 (en) * | 2022-12-05 | 2024-06-13 | Abiomed Europe Gmbh | Blood pump system and method for controlling the speed of a drive unit of a blood pump |
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- 2022-02-25 CN CN202210179914.3A patent/CN114796850A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024120912A1 (en) * | 2022-12-05 | 2024-06-13 | Abiomed Europe Gmbh | Blood pump system and method for controlling the speed of a drive unit of a blood pump |
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