IABP drive unit

Abstract

To enable correction of measured pressure without stopping pumping operation.SOLUTION: A pressure P1 measured by a first pressure sensor 30 disposed on a balloon 28 is stored, and when driving the balloon, the measured pressure P1 is calibrated by a pressure P2 measured by a second pressure sensor 32 that measures the pressure inside a semi-inflated balloon at predetermined intervals. A pressure P3 obtained from a third sensor 34, different from the first and second pressure sensors, is used, and when the pressure P1 is smaller than the pressures P3 by more than a predetermined value, a difference OF2 between P3 and P1 is used to correct the stored P1, to display the difference OF2 to enable manual adjustment, or to store the difference OF2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an IABP driving device (abbreviation for IABP balloon driving device) that drives a balloon by an IABP (intra-aortic balloon pumping) method. [Background technology]

[0002] The balloon used in the IABP (intra-aortic balloon pumping) method is attached to a catheter, inserted into an artery in the patient's body, and placed in the aorta near the patient's heart. The IABP driver pumps by feeding a shuttle gas such as helium into the balloon via the catheter and repeatedly inflating and deflating the balloon in synchronization with the heartbeat, thereby increasing blood flow in the coronary arteries of the heart of a patient with heart disease such as myocardial infarction, heart failure, or cardiomyopathy, thereby increasing myocardial oxygen supply and reducing cardiac workload, thereby reducing oxygen consumption. Examples of such conventional IABP drivers are disclosed in Patent Documents 1 and 2 listed below.

[0003] The IABP drive devices described in Patent Documents 1 and 2 measure the blood pressure of blood in the artery using a blood pressure sensor located outside the balloon and display the measured value. Helium gas is generally used as a shuttle gas for pumping the balloon, but helium gas supplied to the balloon via a catheter can leak into the internal space of a blood pressure sensor, such as an optical sensor, located outside the balloon. The optical sensor has a diaphragm at the tip of a cylindrical part whose internal space is vacuum at the time of manufacture. The optical sensor measures blood pressure by measuring the amount of axial displacement of the diaphragm due to blood pressure in the artery. However, if helium gas leaks into the internal space of the optical sensor's cylindrical part, the diaphragm will be displaced away from the cylindrical part due to the helium gas pressure, resulting in a blood pressure that is lower than the actual blood pressure and an inaccurate measurement. This phenomenon is called negative drift due to helium gas. Figure 7 shows how the pressure measured by the optical sensor becomes lower than the actual blood pressure over time and deviates from the actual blood pressure. Over time, negative drift (shown as "pressure drift" in Figure 7) causes the blood pressure measured by the optical sensor to be lower than the actual blood pressure. To prevent this problem, measures can be taken to prevent the inflow of helium gas from the balloon into the optical sensor, but while this is effective to a certain extent, it is not possible to completely prevent the inflow of helium gas.

[0004] In the drive device for the balloon pump with an arterial pressure sensor described in Patent Document 1, in order to solve the problem that the zero point of the blood pressure measurement by the arterial pressure sensor fixed to the tip of the balloon fluctuates over time, making it impossible to measure blood pressure accurately, a pressure sensor is provided to measure the internal pressure of the balloon, and when a difference occurs between the blood pressure measured by the arterial pressure sensor and the blood pressure measured by the pressure sensor measuring the pressure inside the balloon, the zero point of the arterial pressure sensor is adjusted to eliminate this difference.In addition, in the following Patent Document 2, the shuttle gas delivered to the balloon is controlled to put the balloon in a semi-inflated state, the gas pressure inside the balloon is measured, and the measured pressure is used to calibrate the measurement by the blood pressure sensor connected to the balloon. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 2902040 [Patent Document 2] Patent No. 5361383 Summary of the Invention [Problem to be solved by the invention]

[0006] In the configurations disclosed in Patent Documents 1 and 2, blood pressure is measured using a pressure sensor that measures the pressure inside the balloon in order to calibrate the measurement value (zero adjustment / calibration) so that the operator can accurately grasp the blood pressure. Therefore, the balloon must be kept in a semi-inflated state. In this state, the IABP driver's original balloon pumping operation, which inflates and deflates the balloon in synchronization with the patient's heartbeat to reduce the patient's cardiac load, must be suspended (see Figure 2b of Patent Document 1, and paragraph 0019 and Figure 2 of Patent Document 2). That is, according to Patent Documents 1 and 2, the IABP driver's original pumping operation is suspended during calibration. During this suspension period, the patient's cardiac function cannot be assisted, and there are concerns that the increase in blood flow to the heart of a patient with heart disease may be suppressed or the cardiac load may increase, resulting in adverse effects. To address changes in the optical sensor over time, such calibration must be performed not only when the IABP catheter is inserted but also at regular intervals, which necessitates the suspension of the pumping operation each time. Therefore, frequent calibration, which requires the balloon to be in a semi-inflated state, is not desirable, and should be performed at long intervals, such as every six hours. While the calibration interval must be kept wide, there is a problem that the aforementioned negative drift occurs during this interval, i.e., during the operation of the IABP balloon, due to helium intrusion into the optical sensor. This negative drift can sometimes occur suddenly, resulting in a significant change between adjacent calibrations, i.e., during pumping operation, which is a problem. [Means for solving the problem]

[0007] In order to solve the problems of the above-mentioned conventional technology, in the present invention, in order to calibrate the first pressure measured by the first pressure sensor arranged in the balloon, a third pressure obtained from a second pressure sensor that measures the second pressure, which is the pressure inside the balloon, and a third pressure obtained from a third pressure sensor that is separate from the first pressure sensor is used, and when it is determined that the first pressure calibrated by the second pressure is smaller than the third pressure by more than a predetermined value, the first pressure is calibrated by the third pressure.

[0008] That is, according to the present invention, there is provided an IABP driving device for driving an IABP balloon having a first pressure sensor that measures a first pressure, the device comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a correcting means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means when the first determining means determines that the first pressure is smaller than the third pressure by more than a predetermined value, and correcting the first pressure stored in the storage means using the calculated second offset value; An IABP driver having:

[0009] With this configuration, even if an undesirable negative drift suddenly occurs while driving the IABP balloon between adjacent calibrations, the first pressure, which had previously been calibrated using the second pressure and stored, can be calibrated to the correct pressure at that time using the third pressure by the correction means, thereby eliminating the effects of the negative drift and making it possible to properly correct the pressure value without stopping pumping by the IABP drive device, thereby accurately assisting the function of the patient's heart and reducing the burden on the patient's heart.

[0010] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a correcting means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means, when the first determining means determines that the first pressure is lower than the third pressure by more than a predetermined value, and the second determining means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and correcting the first pressure stored in the storage means using the calculated second offset value; An IABP driver having:

[0011] With this configuration, by adding conditions for the operation of the correcting means, it is possible to operate the correcting means under desired conditions depending on the situation.

[0012] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the difference between the two is equal to or greater than a first predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a first calculation means for calculating a first difference which is a difference between a maximum value and a minimum value of the first pressure; a second calculation means for calculating a second difference which is a difference between a maximum value and a minimum value of the third pressure; a third determination means for determining whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; a correcting means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means, and correcting the first pressure stored in the storage means using the calculated second offset value, when the first determining means determines that the difference between the first pressure and the third pressure is equal to or greater than the first predetermined value, and the second determining means determines that the first pressure is lower than the second pressure by equal to or greater than the second predetermined value, and the third determining means determines that the value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; An IABP driver having:

[0013] With this configuration, by adding conditions for the operation of the correcting means, it is possible to operate the correcting means under desired conditions depending on the situation.

[0014] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in a semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a display means for calculating a second offset value, which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, and displaying the calculated second offset value or the third pressure; An IABP driver having:

[0015] With this configuration, by displaying the second offset value, a doctor can manually control the IABP drive device, allowing for detailed manual response that is different from control by the correction means.As a result, it is possible to reduce the frequency of calibration that stops pumping, and it is also possible to eliminate the effects of negative drift, thereby accurately supporting the function of the patient's heart and reducing the burden on the patient's heart.

[0016] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in a semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a display means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value and the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and for displaying the calculated second offset value or the third pressure; An IABP driver having:

[0017] With this configuration, by adding conditions for the operation of the display means, it is possible to operate the display means under desired conditions depending on the situation.

[0018] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in a semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a first calculation means for calculating a first difference which is a difference between a maximum value and a minimum value of the first pressure; a second calculation means for calculating a second difference which is a difference between a maximum value and a minimum value of the third pressure; a third determination means for determining whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; Step by step, a display means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and the third determination means determines that a value obtained by subtracting the first difference from the second difference is lower than a third predetermined value; and An IABP driver having:

[0019] With this configuration, by adding conditions for the operation of the display means, it is possible to operate the display means under desired conditions depending on the situation.

[0020] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in a semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a second storage means for calculating a second offset value, which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, and for storing the calculated second offset value or the third pressure; An IABP driver having:

[0021] With this configuration, by storing the second offset, it is possible to grasp the change in the second offset during the actual operation of the IABP drive device, making the subsequent operation of the IABP drive device more accurate.As a result, it is possible to reduce the frequency of calibrations that stop pumping, and it is also possible to eliminate the effects of negative drift that occurs during calibration, thereby enabling the patient's heart function to be accurately assisted and the burden on the patient's heart to be reduced.

[0022] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in a semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a second storage means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value and the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and for storing the calculated second offset value or the third pressure; An IABP driver having:

[0023] With this configuration, by adding the conditions for the operation of the storage means, it is possible to operate the storage means under desired conditions.

[0024] According to the present invention, there is also provided an IABP driving device for driving an IABP balloon having a first pressure sensor for measuring a first pressure, comprising: a second pressure sensor that measures a second pressure that is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in a semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is lower than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a first calculation means for calculating a first difference which is a difference between a maximum value and a minimum value of the first pressure; a second calculation means for calculating a second difference which is a difference between a maximum value and a minimum value of the third pressure; a third determination means for determining whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; 、 a second storage means for calculating a second offset value, which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, and the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and the third determination means determines that a value obtained by subtracting the first difference from the second difference is lower than a third predetermined value; and An IABP driver having:

[0025] With this configuration, by adding the conditions for the operation of the storage means, it is possible to operate the storage means under desired conditions.

[0026] According to the present invention, there is also provided a method for calibrating, displaying, and storing measured blood pressure in an IABP driver having shuttle gas supply means for supplying shuttle gas to an IABP balloon to pump the balloon and then stopping the pumping to keep the balloon in a semi-inflated state, comprising: controlling the shuttle gas supply means to stop the pumping and place the balloon in a semi-inflated state; When the balloon is in a semi-inflated state, reading and storing a first pressure measured by a first pressure sensor disposed outside the balloon and a second pressure measured by a second pressure sensor that measures the internal pressure of the balloon; an adjustment step of comparing the stored first pressure with the stored second pressure, adjusting the zero point of the first pressure sensor so that a first offset, which is a difference between the two, is eliminated, and immediately thereafter rewriting the already stored first pressure with the second pressure; controlling the shuttle gas supply means to terminate the semi-inflated state of the balloon and resume pumping; a time determination step of determining whether a predetermined time has elapsed since the previous zero point adjustment; If the predetermined time has not elapsed, the pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor is Shows blood pressure reading a third pressure; If the predetermined time has elapsed, returning to the step of semi-inflating the balloon; and a first determination step of comparing the first pressure with the third pressure and determining that the first pressure is lower than the third pressure by more than a predetermined value; The first pressure is compared with the second pressure, and the first pressure is determined to be greater than the second pressure. Second a second determination step of determining that the difference is smaller than a predetermined value; Among the three determination steps of the third determination step, a first difference which is the difference between the maximum and minimum values ​​of the first pressure is detected, a second difference which is the difference between the maximum and minimum values ​​of the third pressure is detected, and it is determined whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value, a second offset value which is the difference between the third pressure and the first pressure is calculated according to the determination result of the first determination step, or according to the determination results of the first and second determination steps, or according to the determination results of the first to third determination steps, and a second offset value which is the difference between the third pressure and the first pressure is calculated according to the calculated second offset value or the third pressure. 、 A method for calibrating / displaying / storing measured blood pressure in an IABP driving device is provided, which is configured to perform one or more of three steps: a step of correcting the first pressure that has already been overwritten and stored with the second pressure; a step of displaying the second offset value or the third pressure; and a step of storing the second offset value or the third pressure.

[0027] This configuration controls and displays the information according to one or more of the three conditions in the three decision steps. It is possible to perform one or more of the following: correcting means, displaying means, and storing means, and it is possible to obtain one or more of the same effects as those obtained by the correcting means, displaying means, and storing means in the IABP driving device described above. [Effects of the Invention]

[0028] The IABP driving device of the present invention described in any one of claims 1 to 3 has the above-mentioned configuration, so that the pressure value can be appropriately corrected by the correction means without stopping pumping by the IABP driving device, and therefore a corrected pressure value can be obtained while accurately assisting the function of the patient's heart.

[0029] The IABP driving device of the present invention described in any one of claims 4 to 6 has the above-mentioned configuration, and by displaying the second offset value using the display means, it becomes possible for a doctor to manually control the IABP driving device, allowing for detailed manual response separate from the corrections made by the correction means, and as a result, it becomes possible to reduce the frequency of internal calibration, which stops pumping, and therefore obtain corrected pressure values ​​while accurately assisting the function of the patient's heart.

[0030] The IABP driving device of the present invention described in any one of claims 7 to 9 has the above-mentioned configuration, and by storing the second offset in the memory means, it is possible to grasp the change in the second offset during the actual operation of the IABP driving device, making the subsequent operation of the IABP driving device more accurate, and as a result, it is possible to reduce the frequency of internal calibration in which pumping is stopped, thereby obtaining a corrected pressure value while accurately assisting the function of the patient's heart.

[0031] The method for calibrating / displaying / storing measured blood pressure in the IABP driving device of the present invention described in claim 10 has the above-mentioned configuration, and therefore is able to perform one or more of control, display, and storage depending on one or more of the three conditions, and can obtain one or more effects similar to the effects of the correction means, display means, and storage means in the above-mentioned IABP driving device. [Brief explanation of the drawings]

[0032] [Figure 1] 4 is a flowchart showing a first operation of the embodiment of the IABP driving device of the present invention. [Figure 2]2 is a flowchart showing the details of one step in the flowchart of FIG. 1. [Figure 3] 10 is a flowchart showing a second operation of the embodiment of the IABP driving device of the present invention. [Figure 4] 10 is a flowchart showing a third operation in the embodiment of the IABP driving device of the present invention. [Figure 5] 1 is a perspective view showing a main body of an embodiment of an IABP driving device of the present invention. FIG. [Figure 6] 1 is a block diagram of an embodiment of an IABP driver of the present invention. [Figure 7] FIG. 10 is a diagram showing the time variation of blood pressure measurements showing the operation of a conventional IABP driving device. DETAILED DESCRIPTION OF THE INVENTION

[0033] Preferred embodiments of the present invention will now be described with reference to the drawings. Figure 5 is a perspective view showing the main body of an embodiment of the IABP driver of the present invention. The IABP driver 10 is placed near the patient and is configured so that a doctor can operate the operation unit 12 and visually check the blood pressure values ​​and electrocardiogram displayed on the display unit 14. The appearance of the IABP driver 10 is similar to that of conventional devices.

[0034] FIG. 6 is a block diagram of an embodiment of the IABP driver of the present invention. The IABP driver 10 includes an operation unit 12, a display unit 14, a shuttle gas supply source 16, a control unit 18, an interface 20, and a memory unit 22. The shuttle gas supply source 16, which constitutes the shuttle gas supply means, supplies shuttle gas to the interior of the IABP balloon 28 via a catheter 24. The shuttle gas supply source 16 includes a positive pressure source, a negative pressure source, and a gas source such as helium gas (not shown). The shuttle gas supply source 16 controls the flow rate of the shuttle gas supplied to the interior of the balloon 28 in response to a control signal from the control unit 18, thereby repeatedly inflating and deflating the balloon 28. Specifically, the shuttle gas supply source 16 can pump the balloon 28 or temporarily halt pumping to place the balloon in a semi-inflated state. These operations are controlled by the control unit 18. The control signal generated by the control unit 18 is generated using a predetermined register functioning as at least the first memory means within the control unit 18. An optical sensor 30 is disposed on the exterior of the balloon 28.

[0035] The optical sensor 30 measures a first pressure P1, which is the blood pressure in an artery (not shown), and constitutes a first pressure sensor. One end of an optical fiber 26 is connected to the optical sensor 30, and the other end of the optical fiber 26 is connected to the interface 20. In this example, the optical sensor 30 measures the first pressure P1, which is the blood pressure near the balloon 28, but the sensor for measuring the first pressure P1 is not limited to an optical sensor. The catheter 24, balloon 28, and optical sensor 30 shown in FIG. 6 are not components of the IABP driver 10 itself; rather, the catheter 24 is connected to the IABP driver 10, shuttle gas is supplied into the balloon 28, and the optical sensor 30 measures the blood pressure in the artery in which the balloon 28 is located.

[0036] A pressure sensor 32 is connected to the catheter 24, and measures a second pressure P2, which is the internal pressure of the balloon 28, and the output signal is supplied to the interface 20, which constitutes receiving means. The pressure sensor 32 constitutes the second pressure sensor 32. In this example, the second pressure sensor 32 is provided inside the IABP drive device 10, but it may also be provided externally. In the IABP drive device, a sensor (not shown) is attached to the patient to obtain an electrocardiogram of the patient, and the output signal of this sensor is input to the IABP drive device, and the electrocardiogram is displayed on the display unit 14 as necessary.

[0037] The pressure sensor 34, separate from the first pressure sensor 30 and the second pressure sensor 32, measures a third pressure P3, which is the blood pressure at a predetermined location on the patient's body. This pressure sensor 34 constitutes the third pressure sensor 34. For example, a pressure transducer for measuring blood pressure, typically used for connecting to a bedside monitor, can be used as the third pressure sensor 34. That is, the third pressure sensor 34 is used to minimize the frequency of calibrations in which the balloon 28 is placed in a semi-inflated state and used as a blood pressure sensor, and to reduce the effects of negative drift that may occur during the operation of the IABP balloon between adjacent calibrations. Therefore, it is desirable for the third pressure sensor 34 to be separate from the first pressure sensor 30 and the second pressure sensor 32 and capable of measuring the actual blood pressure as accurately as possible. Like the first pressure sensor 30, the third pressure sensor 34 is not a component of the IABP driver 10 itself.

[0038] In accordance with instructions from the operator input via operation unit 12, control unit 18 controls shuttle gas supply source 16 to appropriately control the flow rate of shuttle gas supplied to balloon 28 via catheter 24, so that the balloon pumps (repeatedly expands and contracts) in synchronization with the patient's heartbeat. To perform this control, control unit 18 includes a CPU (Central Processing Unit) (not shown), a RAM serving as temporary storage memory, and a ROM storing programs for the CPU's operation. In addition to controlling the inflation and deflation of the balloon, control unit 18 also controls the display of necessary information on display unit 14 and the storage of predetermined information in memory unit 22. That is, control unit 18 constitutes control means, but also constitutes storage means, adjustment means, correction means, first to third determination means, first and second calculation means, and first and second writing means.

[0039] FIG. 1 is a flowchart showing a first operation of an embodiment of the IABP driver of the present invention. That is, it shows the operation of the CPU in the control unit 18 in FIG. 6. The flow in FIG. 1 starts when the power switch of the IABP driver 10 is turned on and an instruction to start pumping is given. First, in step S1, it is determined whether a calibration instruction has been received from the physician operating the IABP driver 10. The physician can use the operation unit 12 of the IABP driver 10 to input an instruction for calibration when calibration is deemed necessary. If an instruction for calibration has been received, the control unit 18 indicates that an instruction for calibration has been received, for example, by setting a corresponding flag. If an instruction for calibration has not been received, the determination in step S1 is NO, and step S1 is repeated. If an instruction for calibration has been received, the determination in step S1 is YES, and the flow proceeds to step S2, where the pumping of the balloon 28 that had been performed until then is temporarily stopped and the balloon 28 is placed in a semi-inflated state.

[0040] That is, control unit 18 controls shuttle gas supply source 16 to control the flow rate of shuttle gas supplied to balloon 28 via catheter 24, thereby placing balloon 28 in a semi-inflated state. Since the internal pressure of balloon 28 in a semi-inflated state is considered to be equal to the ambient pressure (i.e., the arterial blood pressure), the internal pressure of balloon 28 in a semi-inflated state, i.e., the measured pressure P2 of second pressure sensor 32, can be considered to indicate blood pressure. While step S1 determines whether a calibration command is issued, this is not limitative; the determination result of step S1 can also be set to YES every time a predetermined time elapses on a predetermined timer. Furthermore, step S1 can also determine both whether a calibration command is issued and whether a predetermined time has elapsed. In this case, if step S1 returns YES in response to a calibration command, calibration can be started manually when deemed necessary by a physician. If step S1 returns YES after a predetermined time has elapsed, calibration can be started automatically after the predetermined time has elapsed, regardless of the physician's decision.

[0041] In the next step S3, the first and second pressures P1 and P2 are read as measured pressures. These pressures P1 and P2 are stored in a predetermined register that functions as a first storage unit in the control unit 18. Alternatively, they can be stored in the storage unit 22. Because these measured pressures P1 and P2 and a third measured pressure P3 (described later) repeatedly rise and fall over time, the time averages of the measured pressures P1, P2, and P3 input from the interface 20 are calculated. These time averages are used in the following steps, except for the case where maximum and minimum values ​​are to be obtained. Instead of the time averages, medians or other statistically processed values, which are values ​​obtained by statistically processing values ​​that change over time, can also be used for these pressures P1, P2, and P3. In other words, the pressures P1, P2, and P3 used in the following steps are average values, such as statistically processed values, rather than instantaneous values, except for the case where maximum and minimum values ​​are to be obtained. Although not shown in the figure, pumping continues to be stopped in step S2 until the measured pressures P1 and P2 are stored in step S3, and the balloon 28 is maintained in a semi-inflated state.

[0042] In the next step S4, a first offset value OF1, which is the difference between the second pressure P2 and the first pressure P1, is calculated. In the next step S5, the first offset value OF1 is used to perform zero-point adjustment of the first pressure sensor 30. In other words, the first pressure P1 measured by the first pressure sensor 30 is calibrated and replaced with the second pressure P2 measured by the second pressure sensor 32, and this is stored in a predetermined register functioning as a first storage means in the control unit 18. Note that this can also be stored in the storage unit 22, in addition to the predetermined register. From a hardware perspective, the zero-point adjustment of the first pressure sensor 30 in step S5 constitutes an adjustment means. When the zero-point adjustment in step S5 is completed, the first pressure P1 immediately after the zero-point adjustment is stored. That is, when the balloon 28 is in a semi-inflated state, the first pressure P1 read and stored in step S3 is overwritten and rewritten with the first pressure P1 immediately after the zero-point adjustment. From a hardware perspective, this rewriting constitutes a first writing means. After the rewriting, the balloon 28, which was set to the semi-inflated state in step S2, returns to normal pumping operation from the semi-inflated state. Next, in step S6, it is determined whether a predetermined time has elapsed since the previous zero point adjustment. The predetermined time can be several hours, for example, about six hours. This elapsed time can be determined using a software timer with a preset time, or by comparing the time of the first zero point adjustment with the current time. Until the predetermined time has elapsed, the determination result in step S6 will be NO, and the process proceeds to step S7.

[0043] On the other hand, once the predetermined time has elapsed, the determination in step S6 becomes YES, and the process returns to step S2, where the zero-point adjustment in step S5 is performed again via steps S2 to S4. That is, if the predetermined time in step S6 is, for example, six hours, calibration through zero-point adjustment is repeated every six hours. Note that, although six hours is given as an example of the predetermined time in step S6, the balloon may be semi-inflated once every 30 minutes after the start of operation of the IABP driver 10 in the early stages after the start of operation, once every hour thereafter until six hours have elapsed, and once every six hours after six hours have elapsed. That is, the predetermined time in step S6 is not fixed, but may be variable depending on the time elapsed since the start of operation of the IABP driver 10.

[0044] If the predetermined time has not elapsed, i.e., if the determination result in step S6 is NO, the measured pressure (third pressure) P3 is read in step S7 and stored in a predetermined register functioning as a first storage means in the control unit 18. It should be noted that the third pressure P3 can also be stored in the storage unit 22 instead of the predetermined register. From a hardware perspective, the storage of the third pressure P3 in step S7 constitutes a second writing means. Next, in step S8, the first pressure P1 is subtracted from the third pressure P3, and it is determined whether the difference is greater than a first predetermined value T1. In other words, it is determined whether the first pressure P1 is smaller than the third pressure P3 by a predetermined value. The first predetermined value T1 can be, for example, 5 mmHg. As an example, if the first pressure P1 is 45 mmHg and the third pressure P3 is 55 mmHg, then P3-P1=10 mmHg. If T1 is 5 mmHg, then 10 mmHg > 5 mmHg, and the first pressure P1 is smaller than the third pressure P3 by more than the predetermined value. Note that, regardless of the above example, the first predetermined value T1 can be set larger or smaller as needed. If it is set to 0, then if P3 > P1, step S8 will return YES.

[0045] If the determination result in step S8 is NO, the process returns to step S7. If the determination result is YES, the process proceeds to step S9, where the first pressure P1 is subtracted from the third pressure P3 to obtain a second offset value OF2 as the calculation result. Next, in step S10, the first pressure P1 is corrected using the second offset value OF2. That is, the first pressure P1 is corrected to a value obtained by adding the second offset value OF2 to the first pressure P1 after the correction and storage in step S5. Specifically, this is the same as using the third pressure P3 obtained by the third pressure sensor 34 instead of the first pressure P1 (in other words, rewriting the first pressure with the third pressure). Therefore, the first pressure P1 stored in the predetermined register functioning as the first storage means in the control unit 18 or in the storage unit 22 is overwritten with the third pressure P3.

[0046] Here, the first pressure P1 before being overwritten by the third pressure P3 is not the value read in step S3, but the value zero-point adjusted and replaced with the second pressure P2 in step S5. In other words, the first pressure P1 after being changed and stored by calibration in step S5 is discarded and replaced with the third pressure P3. The correction to the value to which the second offset value OF2 is added in step S5, or the rewriting of the first pressure by the third pressure P3, constitutes a correction means in terms of hardware. In the next step S11, it is determined whether or not a termination command has been issued by a physician. Similar to the calibration command described above, a termination command is an instruction input by a physician using the operation unit 12 of the IABP driver 10 to terminate the operation of the IABP driver 10. If a termination command has been issued, the control unit 18 indicates that a termination command has been issued, for example, by setting a corresponding flag. If a termination command has not been issued, the determination in step S11 is NO, and the process returns to step S6. If it is determined that an instruction to terminate has been given, step S11 becomes YES, and the flow in Fig. 1 ends. In step S11, it is determined whether or not an instruction to terminate has been given from the doctor, but this is not limiting, and the determination result in step S11 can also be YES every time a predetermined time has elapsed on a predetermined timer.

[0047] When returning from step S11 to step S6, if the predetermined time has not elapsed in step S6, steps S7 to S11 are executed. Therefore, if step S8d is YES, steps S9 and S10 discard the first pressure P1 stored up to that point and replace it with the third pressure P3. Also, if it is determined in step S6 that the predetermined time has elapsed, the process returns to step S2, and steps S2 to S5 are executed. Therefore, the value rewritten with the third pressure P3 in step S11 will be used until a negative drift occurs again before the next calibration using a semi-inflated balloon, and the first pressure P1 is discarded again and replaced with the third pressure P3, or until the next calibration using a semi-inflated balloon.

[0048] FIG. 2 is a flowchart showing step S10 in FIG. 1 in detail. In step S10a, the above-described correction is performed using the second offset value OF2. In the next step S10b, the second offset value OF2 is displayed on the display unit 14. The physician operating the IABP driver 10 can use the second offset value OF2 displayed on the display unit 14 to issue calibration instructions or perform other controls as needed by operating the operation unit 12. In step S10c, the second offset value OF2 is stored in the memory unit 22. The memory unit 22, which constitutes the storage means, can be a semiconductor RAM or a hard disk. Storing the second offset value OF2 allows the IABP driver 10 to grasp changes in the second offset value OF2 during actual operation, thereby enabling the IABP driver 10 to operate more accurately thereafter. As a result, it becomes possible to reduce the frequency of calibrations that require pumping to be stopped. The above correction, display, and storage may not necessarily be based on the second offset value OF2, but may also be based on the third pressure P3, and the display and storage may be based on both the second offset value OF2 and the third pressure P3.

[0049] Although the flowchart of FIG. 2 shows the three processing steps S10a, S10b, and S10c as being executed sequentially, these three steps do not necessarily have to be executed in the order of the flowchart of FIG. 2. All three steps can be executed in any order, or only one of these three steps, or two of these steps can be executed in any order. That is, the "correct / display / store" in step S10 of FIG. 1 means that one or more of these three operations are executed. When two or more operations are executed, any two or three of these operations can be executed in any order. Note that if the execution of step S10 determines that the IABP driver 10 is correctly calibrating the pressure P1, the frequency of zero-point adjustments, in which pumping is temporarily stopped, i.e., steps S2 to S5, can be reduced. To achieve this, the predetermined time in step S6 can be set to a longer time.

[0050] FIG. 3 is a flowchart showing a second operation of the embodiment of the IABP driver 10 of the present invention. In FIG. 3, the same steps as those in FIG. 1 are designated by the same step numbers, and their explanations are omitted. The flowchart in FIG. 3 differs from the flowchart in FIG. 1 only in the following respect: a new step S8a has been added between steps S8 and S9 in FIG. 1. In step S8a, the first pressure P1 and the second pressure P2 are compared to determine whether the difference between them is greater than a second predetermined value T2. The second predetermined value T2 can be set to, for example, 20 mmHg. If the determination result in step S8a is NO, the process returns to step S7. If the determination result in step S8a is YES, the process proceeds to step S9, where the same processing as in FIG. 1 is performed.

[0051] FIG. 4 is a flowchart showing a third operation of the IABP driver 10 according to the embodiment of the present invention. In FIG. 4, the same steps as those in FIG. 3 are designated by the same step numbers, and their explanations are omitted. The flowchart in FIG. 4 differs from the flowchart in FIG. 3 only in the following respect: new steps S8b, S8c, and S8d have been added between steps S8a and S9 in FIG. 3. In step S8b, a first difference P1diff between the maximum value P1max and minimum value P1min of the first pressure P1 is calculated. In step S8c, a second difference P3diff between the maximum value P3max and minimum value P3min of the third pressure P3 is calculated. In step S8d, the first difference P1diff is subtracted from the second difference P3diff, and it is determined whether the difference is less than a third predetermined value T3. The third predetermined value T3 may be, for example, 10 mmHg. If the determination result in step S8d is NO, the process returns to step S7. If the determination result in step S8d is YES, the process proceeds to step S9, where the same processing as in FIGS. 1 and 3 is carried out.

[0052] 1, 3, and 4, if the answer is NO in step S11, the process returns to step S1, and is repeated until the answer becomes YES in step S11. That is, after an instruction to perform calibration is given, steps S2 to S10 are executed until an instruction to end calibration is given, and in step S10, control is performed using the second offset value OF2, the second offset value OF2 is displayed on the display unit 14, and the second offset value OF2 is stored in the memory unit 22, thereby achieving the effects described above.

[0053] In the above-described embodiments, the present invention has been described as an IABP drive device or a method for controlling an IABP drive device, but it can also be understood as a program for instructing the operation of the CPU, which is a main part of the control unit 18 of the IABP drive device 10. In other words, the present invention can be understood as a program for causing a computer to execute the method for calibrating / displaying / storing measured blood pressure in an IABP drive device as set forth in claim 10. [Industrial Applicability]

[0054] Because the IABP drive device of the present invention has the above-mentioned configuration, it is possible to minimize the time during which the balloon inflation and deflation operation, which is the original operation of the IABP drive device, is suspended, thereby enabling the device to accurately assist the function of the patient's heart and reduce the burden on the patient's heart.Therefore, the device can be used in various industries, including the medical equipment industry that develops and manufactures IABP drive devices, and the medical industry that uses IABP drive devices. [Explanation of symbols]

[0055] 10 IABP drive unit 12 Control section 14 Display section (display means) 16 Shuttle gas supply source (shuttle gas supply means) 18 control unit (storage means, control means, adjustment means, correction means, first to third judgment means, first and second calculation means, first and second writing means) 20 Interface (receiving means) 22 Storage unit (storage means) 24 Catheter 26 Optical Fiber 28 IABP balloon 30 Optical sensor (first pressure sensor) 32 Second pressure sensor 34 Third pressure sensor

Claims

1. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a correcting means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means when the first determining means determines that the first pressure is smaller than the third pressure by more than a predetermined value, and correcting the first pressure stored in the storage means using the calculated second offset value; An IABP drive device having:

2. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a correcting means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means, when the first determining means determines that the first pressure is lower than the third pressure by more than a predetermined value, and the second determining means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and correcting the first pressure stored in the storage means using the calculated second offset value; An IABP drive device having:

3. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a first calculation means for calculating a first difference which is a difference between a maximum value and a minimum value of the first pressure; a second calculation means for calculating a second difference between the maximum and minimum values ​​of the third pressure; a third determination means for determining whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; a correcting means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means, when the first determining means determines that the first pressure is lower than the third pressure by more than a predetermined value, the second determining means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and the third determining means determines that a value obtained by subtracting the first difference from the second difference is lower than a third predetermined value; and An IABP drive device having:

4. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a display means for calculating a second offset value, which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, and displaying the calculated second offset value or the third pressure; An IABP drive device having:

5. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a display means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value and the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and for displaying the calculated second offset value or the third pressure; An IABP drive device having:

6. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a first calculation means for calculating a first difference which is a difference between a maximum value and a minimum value of the first pressure; a second calculation means for calculating a second difference between the maximum and minimum values ​​of the third pressure; a third determination means for determining whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; a display means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and the third determination means determines that a value obtained by subtracting the first difference from the second difference is lower than a third predetermined value; and An IABP drive device having:

7. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second storage means for calculating a second offset value, which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, and for storing the calculated second offset value or the third pressure; An IABP drive device having:

8. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; a shuttle gas supply means for supplying an appropriate amount of shuttle gas to the balloon to pump the balloon; a control means for controlling the shuttle gas supply means; an adjusting means for controlling the shuttle gas supply means so that the balloon is in a semi-inflated state at predetermined time intervals, comparing the first pressure with the second pressure when the balloon is in the semi-inflated state, and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first and second pressures, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during a pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a second storage means for calculating a second offset value which is the difference between the third pressure and the first pressure stored in the storage means when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value and the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and for storing the calculated second offset value or the third pressure; An IABP drive device having:

9. 1. An IABP drive device for driving an IABP balloon having a first pressure sensor that measures a first pressure, a second pressure sensor for measuring a second pressure, which is the internal pressure of the balloon; a storage means capable of storing the first pressure, the second pressure, and the third pressure; shuttle gas supply means for supplying a controlled amount of shuttle gas to the balloon to pump the balloon and for ceasing said pumping to place the balloon in a semi-inflated state; a control means for controlling the shuttle gas supply means to perform the pumping and stop the pumping at predetermined time intervals to set the balloon in a semi-inflated state, and for controlling the storage means to store the first pressure and the second pressure when the balloon is in the semi-inflated state; an adjustment means for comparing the first pressure stored in the storage means with the second pressure and adjusting the zero point of the first pressure sensor so that a first offset, which is the difference between the first pressure and the second pressure, is eliminated; a first writing means for storing the first pressure immediately after the zero point of the first pressure sensor is adjusted by the adjusting means in the memory means; means for receiving a blood pressure signal indicative of the third pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor during the pumping operation when the balloon is not in the semi-inflated state; second writing means for storing the third pressure in the storage means; a first determination means for comparing the first pressure and the third pressure stored in the storage means and determining whether the first pressure is smaller than the third pressure by more than a predetermined value; a second determination means for comparing the first pressure with the second pressure and determining whether the first pressure is lower than the second pressure by a second predetermined value or more; a first calculation means for calculating a first difference which is a difference between a maximum value and a minimum value of the first pressure; a second calculation means for calculating a second difference between the maximum and minimum values ​​of the third pressure; a third determination means for determining whether a value obtained by subtracting the first difference from the second difference is smaller than a third predetermined value; a second storage means for calculating a second offset value, which is the difference between the third pressure and the first pressure stored in the storage means, when the first determination means determines that the first pressure is lower than the third pressure by more than a predetermined value, the second determination means determines that the first pressure is lower than the second pressure by more than the second predetermined value, and the third determination means determines that a value obtained by subtracting the first difference from the second difference is lower than a third predetermined value; and An IABP drive device having:

10. 1. A method for calibrating, displaying, and storing measured blood pressure in an IABP drive device having shuttle gas supply means for supplying shuttle gas to an IABP balloon to pump the balloon and then stopping the pumping to keep the balloon in a semi-inflated state, comprising: controlling the shuttle gas supply means to stop the pumping and place the balloon in a semi-inflated state; When the balloon is in a semi-inflated state, reading and storing a first pressure measured by a first pressure sensor disposed outside the balloon and a second pressure measured by a second pressure sensor that measures the internal pressure of the balloon; an adjustment step of comparing the stored first pressure with the stored second pressure, adjusting the zero point of the first pressure sensor so that a first offset, which is a difference between the first pressure and the second pressure, is eliminated, and immediately thereafter rewriting the already stored first pressure with the second pressure; controlling the shuttle gas supply means to terminate the semi-inflated state of the balloon and resume pumping; a time determination step of determining whether a predetermined time has elapsed since the previous zero point adjustment; If the predetermined time has not elapsed, reading a third pressure indicating a blood pressure measured by a third pressure sensor other than the first pressure sensor and the second pressure sensor; If the predetermined time has elapsed, returning to the step of semi-inflating the balloon; and a first determination step of comparing the first pressure with the third pressure and determining that the first pressure is lower than the third pressure by more than a predetermined value; a second determination step of comparing the first pressure with the second pressure and determining that the first pressure is lower than the second pressure by more than a second predetermined value; a third determination step for determining whether a value obtained by subtracting the first difference from the third difference is smaller than a third predetermined value; a second offset value for calculating ...

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