JPH08189492A - Inspection device for centrifugal pump console - Google Patents

Abstract

PURPOSE: To realize inspection of a flowmeter of a centrifugal pump console with a simple operation by arranging a centrifugal pump which supplies liquid to the flowmeter, and a pressure difference equalizing means which keeps the pressure difference between.a suction side and a discharge side of the centrifugal pump constant. CONSTITUTION: A centrifugal pump 4 can be driven by a centrifugal pump console 2 which is an inspection object, and can supply liquid to a flowmeter 3 housed in the centrifugal pump console 2. Also provided are an outflow port 5 for supplying the liquid to the centrifugal pump 4 and an introduction port 6 for introducing the liquid passing the flowmeter 3. A liquid storage bath 7 is arranged on the specified height in respect to the centrifugal pump 4. The liquid storage bath 7 and a liquid recovery bath are so arranged as to have the same levels, and a pressure difference equalizing means is adopted. It is thus possible to easily and accurately inspect the centrifugal pump console which is used for an artificial lung or an artificial kidney.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge pump console inspection device, and more particularly to a centrifuge pump console inspection device that can easily and quickly inspect a flow meter of a centrifugal pump console.

[0002]

2. Description of the Related Art Conventionally, artificial heart-lung machines and artificial heart machines are known as medical devices. In recent years, centrifugal pump systems have been adopted for these artificial heart-lung machines and artificial heart machines. The centrifugal pump system usually comprises a centrifugal pump and a centrifugal pump console that controls the centrifugal pump.

An example of such a centrifugal pump system is shown in FIG. The centrifugal pump system shown in FIG. 4 includes a centrifugal pump 20 and a centrifugal pump console 21 that controls the centrifugal pump 20.

The centrifugal pump 20 includes a pump chamber (not shown) in which an impeller is rotatably housed, a suction port 22 arranged above the rotating shaft of the impeller, and a rotary circle formed by the rotation of the impeller. And a discharge port 23 provided in the tangential direction of. Then, when an impeller (not shown) of the centrifugal pump 20 is rotated, blood is introduced from the suction port 22, and the introduced blood is discharged from the discharge port 23 by the centrifugal force due to the rotation of the impeller. Has become.

When such a centrifugal pump system is used in an operation or the like, the vascular system of the patient and the suction port 22 of the centrifugal pump are connected by a line 24, and the discharge port 23 of the centrifugal pump is also connected to the patient. It is connected to the vascular system by line 25.

When the impeller of the centrifugal pump is rotationally driven by a drive motor (not shown) of the centrifugal pump console, the patient's blood is introduced into the centrifugal pump from the suction port 22 through the line 24, and the introduced blood is It is discharged from the discharge port 23. Then, the discharged blood is in line 25.
Returned back to the patient's vascular system via.

Generally, in such a centrifugal pump system, the flow rate of blood discharged from the centrifugal pump must be controlled in order to maintain an appropriate amount of blood sent to the patient's body. The control of the flow rate of blood discharged from the centrifugal pump is performed based on the display value output from a flow meter externally or internally provided in the centrifugal pump console.

The control will be further described. The centrifugal pump console 21 includes an external or internal flow meter 26 and a control unit 27. The flow meter 26 is provided in the middle of a line 25 connecting the discharge port 23 of the centrifugal pump and the vascular system of the patient or in the middle of a line 24 connecting the suction port 22 of the centrifugal pump and the vascular system of the patient. , And outputs measurement data based on the flow rate to the control unit 27. The control unit 27 uses the measurement data input from the flow meter to perform a predetermined calculation to obtain and display the flow rate value. Normally, the flow rate is controlled by changing the rotation speed of the drive motor of the centrifugal pump based on this display. Further, the control unit 27 may be automatically controlled based on the measurement data or the measurement value. In this case, for example, the measured value is compared with a preset set value, and when the measured value is larger than the set value, the rotation speed of the impeller of the blood pump is decreased, and the measured value is set on the contrary. When the value is smaller than the value, the rotation speed of the impeller of the blood pump is increased.

The reason why the centrifugal pump itself is not a metering pump is to control the rotational speed of the centrifugal pump without directly controlling the discharge amount of the centrifugal pump.

A flow meter plays a very important role in such a centrifugal pump console. Therefore, it is necessary to regularly inspect and inspect the flowmeter.

Conventionally, when inspecting a flow meter in a centrifugal pump console (which may be built in the centrifugal pump console or externally attached thereto), the centrifugal pump is driven by the centrifugal pump console and the centrifugal pump is operated. The flow rate discharged from the pump was measured by a flow meter in the centrifugal pump console, and the liquid passing through the flow meter was measured in a measuring container. Then, by comparing the amount of liquid measured per unit time with the flow rate displayed on the flow meter of the centrifugal pump console, for example, the flow rate obtained by the operation of measuring in a measuring container and the flow meter of the centrifugal pump console. When the flow rates match, it is determined that the flow meter in the centrifugal pump console is operating properly, and when they do not match, it is determined that the flow meter in the centrifugal pump console is abnormal.

[0012] However, such an inspection operation has a problem that the operation is complicated, such as a weighing operation, and that the inspection operation requires time.

Further, since the centrifugal pump is not a metering pump and the discharge amount fluctuates due to fluctuations in pressure, when measured in a measuring container for a predetermined time, the average flow rate within that period and the flow rate value displayed by the flow meter are displayed. However, there is a problem that it is not possible to confirm whether or not the flow meter displays an accurate flow rate value at a certain specific flow rate.

Further, in order to carry out an inspection in a state closer to the actual use state, it is desirable to inspect the flowmeter using actually used blood, artificial blood, etc. And, in the operation of measuring with the measuring container, the liquid comes into contact with air and its fluid characteristics change due to coagulation of blood, etc., so highly accurate tests cannot be performed, or blood etc. can be used only once, which is uneconomical. There was a problem that was.

The present invention has been completed based on such circumstances. That is, an object of the present invention is to solve the above problems. An object of the present invention is to provide an inspection device for a centrifugal pump console, which can inspect the flowmeter of the centrifugal pump console with a simple operation.
Further, an object of the present invention is to provide an inspection device for a centrifugal pump console, which can inspect a flow meter included in the centrifugal pump console with extremely high accuracy in a short time.

[0016]

The invention according to claim 1 for solving the above-mentioned problems is driven by a centrifugal pump console to be inspected, and a liquid is supplied to a flowmeter included in the centrifugal pump console. A centrifuge pump console inspecting device comprising a centrifugal pump capable of supplying and a pressure difference constant means for making a pressure difference on a suction port side and a discharge port side of the centrifugal pump constant,
In the invention according to claim 2, the pressure difference constant means is connected to the suction port and the discharge port of the centrifugal pump through a liquid flow path, and is provided at a predetermined height with respect to the centrifugal pump. The centrifugal pump console inspecting device according to claim 1, which is a stored liquid storage tank, and the invention according to claim 3 is characterized in that the pressure difference fixing means includes the centrifugal pump and the flowmeter. The inspection device for a centrifugal pump console according to claim 1, wherein the inspection device is an orifice provided on a liquid flow path communicating with the orifice.

The present invention will be described in detail below. INDUSTRIAL APPLICABILITY The inspection device for a centrifugal pump console of the present invention is used for inspection of a flow meter of a centrifugal pump console used in an artificial heart-lung machine or an artificial heart device.

The centrifugal pump according to the present invention is driven by the centrifugal pump console which is such an inspection target. The centrifugal pump according to the present invention is not particularly limited in its structure and shape as long as it can be driven by the centrifugal pump console to be inspected, can inhale the liquid, and can discharge the inhaled liquid.

The centrifugal pump according to the present invention may be the centrifugal pump of the same kind as the centrifugal pump used by being connected to the centrifugal pump console to be inspected by using the inspecting apparatus for the centrifugal pump console according to the present invention. It may be a centrifugal pump of a different type or a different type. Preferably, the same type of centrifugal pump is adopted. If the same type of centrifugal pump is used, the risk of troubles in driving and controlling the number of revolutions is extremely low.

Specific examples of the centrifugal pump in the present invention include a conventionally known horizontal shaft single suction centrifugal pump, horizontal shaft single suction multistage centrifugal pump, horizontal shaft double suction centrifugal pump, horizontal shaft double suction multistage centrifugal pump, Examples thereof include a vertical single suction centrifugal pump, a vertical single suction multistage centrifugal pump, a vertical double suction centrifugal pump, a vertical double suction multistage centrifugal pump, and a diffuser pump.

The centrifugal pump according to the present invention is driven by the centrifugal pump console to be inspected. In this aspect, the drive motor is driven by the supply of electric power from the centrifugal pump console to be inspected, and the centrifugal pump is driven. It is possible to exemplify a mode in which the impeller is driven, and a mode in which the rotation of the drive motor of the centrifugal pump console is transmitted to and driven by the impeller of the centrifugal pump by mechanical means. The pressure difference fixing means in this invention has a function of making the pressure difference between the suction port side and the discharge port side of the centrifugal pump constant when the rotation speed of the centrifugal pump is constant. The structure is not particularly limited as long as it has such a function.

The pressure difference equalizing means is connected to the suction port and the discharge port of a centrifugal pump through a liquid flow path, and is provided with a liquid storage tank provided at a predetermined height with respect to the centrifugal pump, and a centrifuge. An orifice or the like provided on the liquid flow path that connects the pump and the flow meter can be exemplified.

[0023]

This centrifuge pump console inspection device is used in the following manner to inspect the flow meter of the existing centrifuge pump console to be inspected.

That is, the centrifugal pump is connected to an existing centrifugal pump console so that the centrifugal pump can be driven under the control of the centrifugal pump console. A suction port of the centrifugal pump and a liquid supply source such as a liquid storage tank are connected via a fluid flow path, and a discharge port of the centrifugal pump is connected to a flow meter in an existing centrifugal pump console.

The centrifugal pump console drives the centrifugal pump. The pressure difference fixing means keeps the pressure difference between the suction port and the discharge port of the centrifugal pump constant. The flow rate of the liquid discharged from the discharge port is measured by a flow meter in the centrifugal pump console.

The flow rate value obtained by the flow meter is compared with the flow rate value obtained by the flow rate / pressure difference calibration curve previously examined for the centrifugal pump in this inspection apparatus.

As a result of the comparison, when the measurement value obtained from the flow meter and the flow rate value obtained from the calibration curve match, it is judged that the flow meter in the centrifugal pump console is operating correctly, and they do not match. Sometimes it is judged that the flow meter in the centrifugal pump console is out of order.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. It is needless to say that the present invention is not limited to this embodiment, and design changes can be appropriately made within the scope of the gist of the present invention.

(Embodiment 1) FIG. 1 is an explanatory view showing an embodiment of an inspection apparatus for a centrifugal pump console according to the present invention.

This centrifugal pump console inspection device 1A
Is a centrifugal pump console 2 that can be driven by a centrifugal pump console 2 to be inspected, and is capable of supplying a liquid to a flow meter 3 built in the centrifugal pump console 2, and a guide that supplies a liquid to the centrifugal pump 4. It is provided with an outlet 5 and an inlet 6 for introducing the liquid that has passed through the flowmeter 3, and a liquid storage tank 7 provided at a predetermined height with respect to the centrifugal pump 4.

The centrifugal pump 4 has a liquid suction port 8 and a liquid discharge port 9, and the liquid sucked from the liquid suction port 8 is driven by rotating an impeller (not shown) incorporated therein. The liquid is discharged from the discharge port 9.

This rotation drive is performed by the centrifugal pump console 2 which is the inspection target of the inspection device 1A for the centrifugal pump console. That is, the centrifugal pump 4 can be connected via the drive motor 11 electrically connected to the control unit 10 of the centrifugal pump console 2, and the rotation speed thereof is controlled according to the drive signal from the control unit 10. It is like this. The control unit 10 also has a function of displaying the rotation speed of the centrifugal pump.

The liquid suction port 8 of the centrifugal pump 4 is connected to the liquid storage tank 7 by a pipe through which the liquid can flow, and the liquid discharge port 9 is also built in the centrifugal pump console 2. Connected to the flow meter 3.

The liquid storage tank 7 can store a liquid therein, for example, blood or artificial blood, and the inlet 6
Is connected to the downstream side of the flowmeter 3 built in the centrifugal pump console 2 by a pipe through which liquid can flow. The liquid storage tank 7, the centrifugal pump 4, and the flowmeter 3 are connected by a fluid flow path to form a circulation flow path.

The predetermined height at which the liquid storage tank 7 is provided means that the liquid surface of the liquid storage tank 7 is higher than both the liquid suction port 8 and the liquid discharge port 9 of the centrifugal pump 4. I wish I had it.

This centrifugal pump console inspection device 1A
A method of inspecting the centrifugal pump console 2 using will be described.

As shown in FIG. 1, a centrifugal pump console inspection device 1A is connected and a liquid such as blood or artificial blood is put into the liquid storage tank 7.

A command is input to the control unit 10 of the centrifugal pump console 2 to be inspected to drive the centrifugal pump 4. At this time, the control unit 10 displays the number of rotations of the centrifugal pump per unit time. In this embodiment, the control unit 10 displays the number of revolutions of the centrifugal pump 4, but if the centrifugal pump console to be inspected does not have such a display unit, the centrifugal pump console displays such a display unit. May be connected to and displayed on the centrifugal pump, or the centrifugal pump may be provided with or connected to display means for displaying.

When the centrifugal pump 4 is driven at a constant rotation speed, the liquid flows in the direction shown by the arrow in FIG. At this time, the liquid storage tank 7 located at a predetermined height with respect to the centrifugal pump 4, the centrifugal pump 4, the flow meter 3, and the circulation flow path formed by the fluid flow path connecting these serve as a pressure difference constant means. Functioning, the pressure difference between the suction side and the discharge side of the centrifugal pump 4 becomes constant. Therefore, the liquid can be supplied to the flowmeter 3 at a predetermined flow rate by setting the rotation speed to a predetermined value. That is, since the fluctuation of the flow rate due to the fluctuation of the pressure is eliminated, the liquid of a desired flow rate can be supplied to the flow meter 3 by an extremely simple operation such as simply operating the rotation speed of the centrifugal pump.

The flow rate supplied to the flow meter 3 can be obtained from the relationship between the rotational speed of the centrifugal pump 4 and the flow rate of the liquid discharged by the centrifugal pump 4, which has been investigated in advance. That is, the flow rate of the liquid discharged from the centrifugal pump 4 is immediately calculated from the displayed rotation speed by preparing a conversion table or a calibration curve for converting the rotation speed of the centrifugal pump 4 into a flow rate. Here, the rotation speed of the impeller of the centrifugal pump may not be the rotation speed itself, but may be data capable of indirectly knowing the rotation speed. Further, the conversion table may be a program capable of converting the rotation speed and the like into a flow rate.

In this way, the flow rate value supplied to the flow meter 3 can be obtained from the relationship between the rotational speed and the flow rate. Then, this flow rate value is compared with the flow rate value actually obtained from the flow meter 3, and when this flow rate value and the flow rate value actually obtained from the flow meter 3 match, the flow rate in the centrifugal pump console 2 It is determined that the meter 3 is operating correctly, and when they do not match, it is determined that the flow meter 3 in the centrifugal pump console 2 is out of order.

Similarly, by changing the rotational speed, it is possible to check whether or not the flow meter shows an accurate value at other flow rates.

Although it is extremely rare, the discrepancy between the flow rate value obtained from the rotational speed and the flow rate value actually obtained from the flow meter 3 is the case where the displayed rotational speed of the centrifugal pump and the actual rotational speed are different. Also occurs. The flowmeter 3 determined to be out of order by the centrifugal pump console inspection device is further investigated, and when it is found that the flowmeter 3 is normal, the rotation control system of the centrifugal pump console 2 is determined. It can be determined that there is a failure or abnormality in the.

In the first embodiment, the pressure difference fixing means is connected to the suction port and the discharge port of the centrifugal pump through a liquid flow path and is provided at a predetermined height with respect to the centrifugal pump. The liquid storage tank is used, but the liquid storage tank that is connected to the suction port of the centrifugal pump via the fluid flow path to supply the liquid to the centrifugal pump and the discharge port of the centrifugal pump via the fluid flow path A liquid recovery tank for recovering the liquid that has passed through the meter is employed, and the pressure difference fixing means for arranging the liquid storage tank and the liquid recovery layer is arranged so that the liquid surfaces thereof are substantially the same. You can also

(Embodiment 2) FIG. 2 shows another embodiment of the inspection device for a centrifugal pump console according to the present invention. The centrifuge pump console inspection device 1B can be driven by the centrifuge pump console 2 to be inspected, and supplies a liquid to a flow meter 3 electrically connected to the control unit 10 in the centrifuge pump console 2. It has a centrifugal pump 4 that can be supplied, and an orifice 12 provided in a liquid flow path that connects the centrifugal pump 4 and the flow meter 3 to each other.

The centrifugal pump 4 has a liquid suction port 8 and a liquid discharge port 9, and the liquid sucked from the liquid suction port 8 has an impeller (not shown) incorporated in the centrifugal pump 4.
The liquid is ejected from the ejection port 9 by rotating.

This rotation drive can be performed by the centrifugal pump console 2 which is the inspection target of the centrifugal pump console inspection device 1B. That is, the centrifugal pump 4
Can be connected to a drive motor (not shown) electrically connected to the control unit 10 of the centrifugal pump console 2, and its rotation speed can be controlled according to a drive signal from the control unit 10. There is. Further, the centrifugal pump 4 in the second embodiment has a function of displaying the rotation speed of the impeller incorporated therein.

A pipe through which a liquid can flow is connected to the suction port 8 of the centrifugal pump 4 so that the liquid can be supplied from a liquid supply source such as a liquid storage tank. The liquid discharge port 9 is connected to the orifice 12 by a liquid flow path.

Inspection device 1B for this centrifugal pump console
Is a centrifugal pump 4 and a flow meter 3 as means for making the pressure difference constant.
An orifice 12 is provided on the liquid flow path communicating with the.

FIG. 3 is a schematic view of the orifice 12.
The orifice 12 is a tubular body having an annular protruding portion 13 on its inner peripheral surface, and a pipe 14 such as a tube can be connected to both ends thereof. The protrusion 13 is formed into a curved surface so that blood or the like passing through the inside does not stay. The cross section of the space surrounded by the annular protrusion 13 is circular. Both ends of the orifice 12 are formed thinner than the central part so that a step or the like is not formed at the connecting portion with the pipe. The shape of the orifice is not limited to such a circular cross section, and may be any shape such as a rectangular cross section. Further, as another example of the orifice, a pipe having a narrowed portion formed by applying pressure from the outside to deform can be cited.

This centrifugal pump console inspection device 1B
A method of inspecting the centrifugal pump console 2 using will be described. As shown in FIG. 2, the centrifugal pump console inspection device 1B is a centrifugal pump console 2 to be inspected.
Connect to. An instruction is input to the control unit 10 of the centrifugal pump console 2 to be inspected to drive the centrifugal pump 4. The centrifugal pump 4 is rotationally driven based on a drive signal given from the control unit 10, and is displayed as the rotational speed at that time. When the centrifugal pump 4 is driven, the liquid flows in the direction shown by the arrow in FIG. At this time, the orifice 12 functions as a pressure difference constant means, and the differential pressure between the suction port side and the discharge port side of the centrifugal pump 4 becomes constant. Therefore, the liquid can be supplied to the flowmeter 3 at a predetermined flow rate by setting the rotation speed to a predetermined value. The flowmeter 3 can be obtained by checking the relationship between the number of revolutions and the flow rate in advance.
Obtaining the value of the flow rate supplied to is similar to that in the first embodiment. Then, the flow rate value obtained by converting from the number of revolutions is compared with the flow rate value actually shown by the flow meter 3, and when this flow rate value and the flow rate value actually shown by the flow meter 3 match, the centrifugal force It is determined that the flowmeter 3 in the pump console 2 is operating properly, and when they do not match, it is determined that the flowmeter 3 in the centrifugal pump console 2 is out of order.

[0052]

According to the present invention, it is possible to provide an inspection device for a centrifugal pump console, which can inspect a centrifugal pump console used in an artificial heart-lung machine or an artificial heart device very easily and with high accuracy. it can.

According to the present invention, at an arbitrary flow rate,
It is possible to provide an inspection device for a centrifugal pump console capable of accurately inspecting whether or not a flow meter shows an accurate flow rate value.

According to the present invention, it is possible to provide an inspecting device for a centrifugal pump console which can surely detect the abnormality even when a slight deviation occurs in the flow meter.

According to the present invention, the centrifugal pump console can be inspected by using blood, artificial blood or the like under conditions close to the actual use conditions, and therefore, the centrifugal pump console can be inspected with extremely high accuracy. It is possible to provide an inspection device for use. Further, it is possible to provide an inspection device for a centrifugal pump console which can economically perform highly accurate inspection by preventing contact with air such as blood or artificial blood used for inspection and deterioration thereof.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of an inspection device for a centrifugal pump console according to the present invention.

FIG. 2 is a schematic explanatory view showing another embodiment of the inspection device for a centrifugal pump console according to the present invention.

FIG. 3 is a sectional view showing an outline of an example of an orifice.

FIG. 4 is an explanatory diagram showing an example of a centrifugal pump system.

[Explanation of symbols]

1A, 1B ... Inspection device for centrifugal pump console, 2
... Centrifugal pump console, 3 ... Flowmeter, 4 ...
-Centrifugal pump, 5 ... Outlet port, 6 ... Inlet port, 7 ...
..Liquid storage tank, 8 ... suction port, 9 ... discharge port, 1
0 ... Control part, 11 ... Drive motor, 12 ... Orifice, 13 ... Projection part, 14 ... Piping.

[Procedure amendment]

[Submission date] January 17, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (3)

[Claims] 1. A centrifugal pump driven by a centrifugal pump console to be inspected and capable of supplying a liquid to a flow meter of the centrifugal pump console, and a pressure difference between a suction port side and a discharge port side of the centrifugal pump. An inspecting device for a centrifugal pump console, comprising: a constant pressure difference constant means. 2. A liquid storage tank in which the pressure difference fixing means is connected to the suction port and the discharge port of the centrifugal pump via a liquid flow path, and is provided at a predetermined height with respect to the centrifugal pump. The inspection device for a centrifugal pump console according to claim 1, wherein the inspection device is a centrifugal pump console. 3. The centrifuge pump console inspection device according to claim 1, wherein the pressure difference constant means is an orifice provided on a liquid flow path that connects the centrifugal pump and the flow meter.