JP2008253675A - Transfusion line monitoring device and transfusion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfusion line monitoring device and a transfusion apparatus, which are capable of monitoring a transfusion line while suppressing an increase in cost and suppressing an increase in the burden on a medical worker. <P>SOLUTION: A power supply frequency signal induced by capacitance Cp formed between a power source line 11 and a living body 12 is detected by using an electrode 14 fitted to a transfusion line 13. When effective value of the power supply frequency signal is outside a prescribed range, a transfusion line monitoring system 10 is notified of that the power supply frequency signal cannot be normally measured because of noises or the like and stops operating. On the other hand, in the case that the effective value of the power supply frequency signal is within the prescribed range and a change of specific value or larger occurs to the effective value of the power supply frequency signal before and after the button is pressed when a transfusion start button is pressed, it is regarded that a clamp 60 is opened, and processing for transmitting a liquid medicine inside the liquid medicine bottle 16 via the transfusion line 13 is started. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an infusion line monitoring device and an infusion device, and more particularly to an infusion line monitoring device and an infusion device that detect an abnormality in an infusion line provided with a clamp that adjusts the flow rate of liquid.

  As a method for administering a medicine, nutrition or water to a patient, an infusion solution can be mentioned. For such infusion, a peristaltic infusion pump configured to sequentially press the infusion tube with a plurality of fingers to perform infusion, or a roller type to infuse by injecting the infusion tube with a disk having a rotating roller Various devices such as an infusion pump and a syringe-type infusion pump that performs infusion by pressing a piston of a syringe are known.

Various techniques for avoiding inadvertent injection of a drug in a tube into a patient by so-called free flow have been disclosed for infusion using such a device. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-73822) discloses a technique including a tube clamp mechanism that positively prevents free flow by a tube clamp attached to an infusion tube. In addition, a technique for detecting a free flow warning in advance by detecting a roller position in a roller clamp attached to an infusion tube by a sensor is also used.
JP 2004-73822 A

  In addition, in the technique disclosed in Patent Document 1, by newly providing a tube clamp mechanism, the infusion set to be used (types in various devices for infusion described above) is limited, and the number of parts in the infusion system is reduced. There has been a problem that the increase in cost due to the increase in the number of parts and the burden on the medical staff due to the increase in the number of parts.

  Also, in the method of detecting the roller position with a sensor, since the shape of the roller clamp varies depending on the manufacturer, a dedicated holder is required, which increases the burden on the medical staff for setting or replacing the device for infusion. There was a problem.

  The present invention has been conceived in view of such circumstances, and an object of the present invention is to provide an infusion line monitoring device capable of monitoring an infusion line while suppressing an increase in cost and suppressing an increase in burden on a medical worker. It is to provide an infusion device.

  An infusion line monitoring apparatus according to the present invention is an apparatus that monitors an infusion line that is connected to an infusion pump and adjusts the flow rate by a clamp in order to infuse or perfuse infusion, blood, or body fluid into a living body. A detecting means for detecting whether a door of a case member that accommodates a connection portion between the pump and the infusion line is in an open state or a closed state; an informing means for performing a notification operation; and an electrode provided in the infusion line; An acquisition means for acquiring a power supply frequency signal generated by electrostatic induction in the living body via the electrodes, and determining an open / closed state of the infusion line by the clamp based on the power supply frequency signal acquired by the acquisition means When determining that the open / close state of the clamp determined by the determination unit and the determination unit does not correspond to the open / closed state of the door Characterized by a control means to perform the notification operation to the notification means.

  In the infusion line monitoring apparatus of the present invention, it is preferable that the determination means calculates an effective value after amplifying the power frequency signal and determines an open / close state of the clamp based on the effective value.

  In addition, the infusion line monitoring device of the present invention further includes an input unit that receives an input of information, and the determination unit has an effective value of the power supply frequency signal having a specific amount before and after the input of information to the input unit. If it has risen above, it is judged that the state of the clamp has changed from one of the open state and the closed state to the other, and if it has fallen by a certain amount or more, the state of the clamp is in the open state and closed state. It is preferable to determine that the state has changed from one to the other.

  Further, in the infusion line monitoring device of the present invention, the control means is in a state where the change amount with respect to the input means before the input of information to the input means is equal to or more than the specific amount after the input of information to the input means. When continuing, it is preferable to determine the open / close state of the clamp.

  An infusion device according to the present invention is an infusion device for monitoring an infusion line for injecting or perfusing infusion fluid, blood or body fluid into a living body, and a clamp for adjusting the flow rate of the infusion line is attached to the infusion line. A pump mechanism that sends the solution in the infusion line, an infusion pump that includes the pump mechanism and a housing and a door that house a part of the infusion line, a detection unit that detects opening and closing of the door, and a notification operation Performing informing means, an electrode provided in the infusion line, an obtaining means for obtaining a power frequency signal generated by electrostatic induction in the living body via the electrode, and a power frequency signal obtained by the obtaining means The opening / closing state of the infusion line by the clamp based on the determination means, and the opening / closing state of the clamp determined by the determination means is If it is determined that it is not intended to correspond to the open and closed states of the serial door, and further comprising a control means for causing the informing operation to said notification means.

  According to the present invention, it is a value that is considered to take different values depending on whether or not the liquid is flowing in the infusion line, and is generated by electrostatic induction in a living body into which the infusion or the like is injected. Since the value of the power supply frequency signal is detected, the open / close state of the clamp can be indirectly detected without a sensor for detecting the roller position of the clamp as conventionally used. As a result, it is possible to detect the open / close state of the clamp without increasing the number of parts such as the addition of a sensor as described above or a holder dedicated to the sensor, thus increasing costs and increasing the burden on medical personnel. Without this, the infusion line can be monitored.

  In particular, according to the present invention, according to the switching of the open / closed state of the door of the infusion pump that houses a part of the pump mechanism and the infusion line, that is, the mounting state of the infusion line to the infusion pump is highly likely to be switched. In accordance with the timing, a notification operation based on a combination of the detection result of the open / close state of the clamp and the open / closed state of the door can be performed. Therefore, it is possible to monitor the infusion line in a more advanced manner without increasing the cost or increasing the burden on the medical staff.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are the same unless otherwise noted.

  FIG. 1 is a diagram schematically showing an infusion line monitoring system using the infusion line monitoring device of the present invention.

  With reference to FIG. 1, in the infusion line monitoring system 10 of the present embodiment, the medicinal solution in the medicinal solution bottle 16 is administered to the living body 12 through the infusion line 13. The infusion pump 50 is appropriately driven to control the dose of the drug solution to the living body 12.

  The infusion line monitoring system 10 detects a power frequency signal induced by a capacitance Cp formed between the power line 11 and the living body 12 by using an electrode 14 attached to the infusion line 13. It is said. Here, the dielectric is air existing between the power line 11 and the living body 12 which are conductors.

  On the infusion line 13, a clamp 60 is attached. The clamp 60 includes a roller, and by appropriately operating the roller, the flow rate in the flow path of the chemical solution in the infusion line 13 can be adjusted, and the opening and closing of the flow path can be switched.

  The power line 11 is an electric light line or a power line wired in the building, for example, a 100V or 200V commercial AC power line (50 Hz in eastern Japan, 60 Hz in western Japan). In the present embodiment, description will be made by adopting a commercial AC power line of 60 Hz.

  The living body 12 is mainly a human body or an animal, but the infusion line monitoring system 10 of the present embodiment can be applied as long as electrostatic induction occurs. The distance between the power supply line 11 and the living body 12 is not particularly specified, but may be any distance as long as electrostatic induction that can obtain a magnitude enough to measure the power frequency signal is guided to the living body 12.

  The infusion line 13 is composed of a tube, a catheter, or the like through which a chemical solution or blood flows. A needle or a thin tube is provided at one end of the infusion line 13, and an infusion such as a drug solution or blood flows into the living body 12 by being inserted into a desired portion of the living body 12. Further, the other end of the infusion line 13 is connected to the chemical solution bottle 16. Furthermore, an electrode 14 is provided in the middle of the route of the infusion line 13.

  The electrode 14 is installed so as to surround the infusion line 13. In the present embodiment, at least a part of the infusion line 13 is composed of a vinyl chloride tube, and the electrode 14 is installed in the tube. The electrode 14 is connected to the monitoring unit 15.

  The monitoring unit 15 has a role of monitoring the power supply frequency signal output from the electrode 14. In the present embodiment, the state of the drug solution in the infusion line 13 is detected based on the amount of change per unit time of the power frequency signal. Specifically, the monitoring unit 15 indicates the state of the infusion in the infusion line 13 by the behavior of the power supply frequency signal being different depending on whether the drug is flowing in the infusion line 13 or not. To monitor. Since this power supply frequency signal is a minute signal, it needs to be amplified. In FIG. 1, only a circuit diagram for amplifying the power supply frequency signal in the monitoring unit 15 is shown. This is a circuit diagram built in a variable gain amplifier described later. The power supply frequency signal extracted from the power supply 14 is several tens to several hundred mV, and the value of the resistor R1 is selected to be a voltage suitable for the input of the non-inverting input (+) of the operational amplifier 152. Specifically, it is 3500 kΩ. Then, the gain of the operational amplifier 152 at the subsequent stage is adjusted by the dividing resistor R2 of the potentiometer 151, and the power frequency signal is amplified to a constant power voltage. One end of the potentiometer 151 is connected to the output of the operational amplifier 152, the other end is grounded, and the variable terminal is connected to the inverting input (−) of the operational amplifier 152. As a result, the division ratio of the division resistor R2 of the potentiometer 151 is adjusted, and the operational amplifier 152 is used as a variable gain amplifier. The power supply frequency signal amplified by the operational amplifier 152 is input to the microcomputer 23 in the infusion pump 50, as will be described later.

  FIG. 2 is a diagram illustrating a detailed configuration of the monitoring unit 15. The monitoring unit 15 is an embodiment of the infusion line monitoring device of the present invention. As will be described later, the monitoring unit 15 includes a display unit 72. However, the monitoring unit 15 may include a display unit, and may be configured to control a display mode in an external display device. In the infusion line monitoring system 10 of the present embodiment, the monitoring unit 15 is built in the infusion pump 50, but the monitoring unit 15 may be provided separately from the infusion pump 50.

  With reference to FIG. 2, in the monitoring unit 15, a power frequency signal taken out from the electrode 14 attached to the infusion line 13 is first amplified by the variable gain amplifier 20. Next, noise included in the power supply frequency signal is removed by the band pass filter 21. And it is converted into an effective value (DC voltage) by an RMS-DC converter (Root Mean Squared to Direct Current converter) 22. Finally, the microcomputer 23 determines the state of infusion in the infusion line 13 based on this effective value.

The variable gain amplifier 20 includes a potentiometer 151 and an operational amplifier 152, and has a function of amplifying an input power frequency signal to obtain a constant DC voltage output. In the present embodiment, the operational amplifier 152 functions to amplify a frequency signal in the range of 0 to 10 kHz. Since the frequency signal input to the variable gain amplifier 20 is very fine as shown by the waveform F1 in FIG. 2, the gain is changed to adjust the amplification degree of the frequency signal and amplified to a desired frequency signal. . In this embodiment, an operational amplifier 152 having a fixed input resistance of 3.5 MΩ and a high input impedance characteristic of 10 ¹³ Ω is employed. In the present embodiment, the variable resistor R2 of the potentiometer 151 has its variable terminal adjusted by the microcomputer 23 so that the effective value output from the RMS-DC converter 22 is 0.8V. In this embodiment, it is set so that it can be amplified approximately 10 times.

  The bandpass filter 21 has a function of removing noise from the amplified frequency signal (waveform F2 → F3) and extracting a desired frequency signal. The frequency signal shown in the waveform F2 in FIG. 2 includes other noise, but since only the signal in the range of 0 to 10 kHz is amplified in the variable gain amplifier 20, the waveform F3 is caused by the high frequency signal. The impact has been reduced. Therefore, the power frequency signal of the power line 11 can be extracted with high accuracy. In the present embodiment, a secondary bandpass filter having a center frequency of 60 Hz and a selectivity Q set to 4 is employed.

  The RMS-DC converter 22 has a function of converting a power supply frequency signal into a DC voltage. In the RMS-DC converter 22, the signal indicated by the waveform F3 in FIG. 2 is converted into the waveform F4. In the present embodiment, the power frequency signal is amplified and input so that the effective value (DC current) is converted to 0.8V, and the AC voltage at the time of input is approximately 1.12V. By using the RMS-DC converter 22, the sampling frequency of the A / D converter built in the microcomputer 23 is lowered. As a result, the clock frequency of the microcomputer 23 can be reduced, and the power consumption of the system can be reduced. In the present embodiment, the RMS-DC converter 22 is employed, but a normal rectifier circuit may be employed.

  The microcomputer 23 takes in an output signal from the RMS-DC converter 22. The microcomputer 23 changes the effective value based on the power supply frequency signal at a certain point in time by a certain value or more from the effective value based on the power supply frequency signal after a predetermined time has elapsed from that point. In such a case, it is determined that the infusion is flowing in the infusion line 13. Otherwise, it is determined that the infusion is retained in the infusion line 13 or there is no infusion.

  The monitoring unit 15 can be structured such that the electrode 14 and the measurement circuit are integrated and can be easily attached to, for example, a polyvinyl chloride tube constituting the infusion line 13. In this case, the drive voltage is set to ± 1.5 V, and it can be driven by one 600 mA · h rechargeable battery.

  The monitoring unit 15 is connected to an infusion line in the infusion pump 50 and sensors (bubble sensor 54, blockage sensor 55, door opening / closing sensor 70) provided in the infusion pump 50 as described later. Further, the microcomputer 23 is connected to a motor 90 that swings a finger (finger 91) described later.

FIG. 3 is a front view of the infusion pump 50 when the door member is opened.
Referring to FIG. 3, the infusion pump 50 mainly includes a housing 52 and a door member 80 that cover the outer shell. The housing 52 and the door member 80 are connected by a hinge 81. In the infusion pump 50, the surface of the housing 52 and the door member 80 facing the front in FIG. 3 comes into contact with each other when the door member 80 is rotated about the position where the door member 80 is fixed by the hinge 81. In the infusion pump 50, a state where these surfaces are in contact is referred to as a closed state.

  In FIG. 3, for the sake of explanation, the door member 80 is shown in an open state until it is substantially flush with the front side surface of the housing 52. When it is opened to 105 °, it is fixed so as not to rotate any further.

  Referring to FIG. 3, the housing 52 has a tube mounting portion 57 formed of a groove formed in the vertical direction at a substantially central portion, and a tube constituting the infusion line 13 is formed in the tube mounting portion 57. It is configured to be set.

  In addition, a pump mechanism 99 configured to be detachable to such an extent that a total of four screws 110 can be removed with a Phillips screwdriver is provided at a substantially intermediate portion of the groove portion (tube mounting portion 57). Designed so that when the mechanism 99 is contaminated with a chemical solution and the movement of the finger 91 is deteriorated, the pump mechanism 99 is taken out of the housing 52 and washed with a predetermined detergent so that the chemical solution is washed away and the movement returns to normal. Has been. For this reason, the finger 91 provided in the pump mechanism 99 is injection-molded from a thermoplastic resin, such as a polyacetal resin material, which is excellent in chemical resistance and chemical properties.

  In addition, a hook 56 is fixed to the middle right portion of the housing 52. The door member 80 is rotatably held on the door lever 84, so that the door member 80 is maintained in a fixed state with respect to the housing 52.

  Further, a bubble sensor 54 is provided at a portion of the tube mounting portion 57 that faces the most upstream side. This bubble sensor 54 has a predetermined amount (about 0.08 cc) or more of the bubbles mixed in the tube constituting the infusion line 13 so that the length in the tube becomes a predetermined length (for example, about 10 mm). Is detected, the subsequent operation of the infusion pump 50 is forcibly stopped, and the infusion line 13 is configured when the door member 80 positioned opposite to the bubble sensor 54 is closed. By making the tube to be stationary, accurate bubble detection can be performed.

  A pump mechanism 99 is located below the bubble sensor 54. An occlusion sensor 57 composed of a sensor portion 57A and a tube pressing member 57B is disposed above or below the pump mechanism 99. The sensor portion 57A is provided on the housing 52, and the tube pressing member 57B is provided on the door member 80 so as to face the sensor portion 57A. The closing sensor 57 includes a permanent magnet and a pickup for detecting the moving position of the permanent magnet in an analog manner. The block sensor 57 detects the position of the moved permanent magnet according to the expansion change of the tube accompanying the block state of the tube constituting the infusion line 13. Further, instead of the closing sensor 57, a closing sensor 55 for detecting a change in expansion of the tube by a strain gauge may be provided on the door member 80. The blockage sensor 55 detects the amount of strain by which the steel plate or the like is deformed according to the expansion change of the tube.

  Here, the operation principle of the pump mechanism 99 will be described. The finger 91 is built in such that each of the first finger 91A, at least one second finger 91B, at least one third finger 91C, and fourth finger 91D is sequentially reciprocated in the longitudinal direction of the drawing from the upstream side. . The first finger 91A to the fourth finger 91D are preferably not all configured in the same shape. That is, for example, the first finger 91A and the fourth finger 91D are preferably configured to have a larger dimension in the width direction (the dimension in the left-right direction in FIG. 3) than the second finger 91B and the third finger 91C.

  A tube constituting the infusion line 13 is attached to the pump mechanism 99 so as to be sandwiched between the finger 91 and the pressing plate 82 so as to be pressed by the finger 91. When the first finger 91A, the second finger 91B, the third finger 91C, and the fourth finger 91D press the tube in order in the front-rear direction of the paper surface from the upstream side, the drug solution in the tube is delivered to the living body 12. .

  The infusion pump 50 is provided with a door opening / closing sensor (door opening / closing sensor 70 in FIG. 2) (not shown). Whether or not the door lever 84 is engaged with the hook 56 is detected by the door opening / closing sensor.

  4 and 5 show a line including detection of opening and closing of the clamp when the chemical solution (infusion solution) contained in the chemical solution bottle 16 is introduced into the living body 12 through the infusion line 13 in the infusion line monitoring system 10. It is a flowchart of the process (infusion start time monitoring process) performed in order to perform monitoring. In addition, the flowchart includes a process executed by a medical worker as well as a process executed on the infusion line monitoring system 10 side.

  Referring to FIG. 4, in the infusion start monitoring process, first, in step SA10, an infusion set is prepared by a medical worker, and the roller clamp (clamp 60) is closed.

  Next, in step SA20, power is supplied to the infusion line monitoring system 10 from the external commercial power source 900 to the infusion pump 50 when the microcomputer 23 opens a circuit as appropriate based on, for example, an operation on the input unit 73 by the medical staff. Is done.

  Next, in step SA30, the door member 80 is opened in order for a medical worker to set a part of the tube constituting the infusion line 13 to the tube mounting portion 57 or the like in the infusion pump 50. Note that the microcomputer 23 can recognize that the door member 80 has been opened by checking the detection output of the door opening / closing sensor 70 described above.

  Next, in step SA40, a medical worker performs a process such as attaching a tube constituting the infusion line 13 to the tube attachment portion 57 in order to attach the infusion set to the infusion pump 50.

  Next, in step SA50, the medical worker fixes the door member 80 in the closed state by engaging the door lever 84 with the hook 56. The microcomputer 23 can recognize that the door member 80 is closed by receiving the detection output of the door opening / closing sensor 70.

  Next, in step SA60, the microcomputer 23 checks the detection output of the door opening / closing sensor 70 to determine whether the door member 80 is open or closed, and the microcomputer 23 is closed. If it is determined that there is, the process proceeds to step SA70.

Here, normally, the medical worker opens the clamp 60 (step SA61).
In step SA70, the microcomputer 23 measures the tube potential signal at that time. The measured value at this time is Vc.

  Next, in step SA80, the microcomputer 23 determines whether or not the value (Vc) measured in step SA70 is within a predetermined value range of Vm1 to Vm2, and if so, step SA100 ( If the process proceeds to (see FIG. 5) and is determined not to be within that range, that is, if it is determined that Vc is smaller than Vm2 or greater than Vm1, the process proceeds to step SA90.

  In step SA90, the microcomputer 23 notifies the infusion line monitoring system 10 that it is impossible to measure the power supply frequency signal due to noise or the like at this time, and the process is terminated. Note that the notification in step SA90 may be performed, for example, by displaying a message on the display unit 72 such that the power supply frequency signal cannot be detected because it is a place with a lot of electrical noise.

  Referring to FIG. 5, in step SA100, microcomputer 23 measures a power supply frequency signal (tube potential signal), and proceeds to step SA110.

  In step SA110, the microcomputer 23 determines whether or not an operation for starting an infusion (an operation to turn on an infusion start button) is performed on the input unit 73, and when determining that the operation has been performed, The process proceeds to step SA120.

  In step SA120, the microcomputer 23 determines whether the clamp 60 is in the closed state or in the opened state (clamp closed / opened determination). Specifically, after the processing shifts to step SA120, whether the tube potential signal Vc is a constant value (specifically, whether the range of change is less than a specific value) or greater than the specific value. Judge whether there was any change. Here, for the sake of convenience, the value after change when there is a change above the specific value is referred to as Vo.

  If the microcomputer 23 determines that the tube potential signal is constant as described above, the microcomputer 23 proceeds to step SA150. If the microcomputer 23 determines that there has been a change beyond the specified value, the microcomputer 23 proceeds to step SA130.

  In step SA130, it is determined whether or not the clamp blockage release determination process in SA120 has been performed continuously for a threshold Tm or more related to the measurement time. Specifically, the microcomputer 23 determines whether or not Tc is equal to or greater than Tm, where Tc is the time at which the clamp closure release determination process is continuously executed in step SA120. If so, the process proceeds to step SA140, and if not, the process returns to step SA120.

  In step SA140, the microcomputer 23 rotates the motor 90 in accordance with a program stored in the storage device 71 and the like to appropriately drive the finger 91 so that the chemical solution in the chemical solution bottle 16 is supplied in an appropriate amount at an appropriate speed. Control is transferred to the application that executes the infusion control process to be sent to the living body 12, and the process shown in FIG.

  On the other hand, in step SA150, similarly to step SA130, the microcomputer 23 determines whether or not Tc is equal to or greater than Tm. If Tc is equal to or greater than Tm, a notification operation (alarm operation) is performed in step SA160. To finish the process. Note that the notification processing here is a case where the clamp 60 must be in an open state, but is in a closed state, and the tube constituting the infusion line 13 has not been clamped until then. A message prohibiting the rapid opening of the clamp 60 is displayed because it is considered that the chemical solution is retained at a higher pressure than usual due to the blockage.

  In the infusion start monitoring process described above, in step SA80, control is continued on the condition that the power supply frequency signal is within a predetermined range (upper limit value Vm1 and lower limit value Vm2). If it is outside, it is determined that the power supply frequency signal cannot be normally measured due to noise or the like, and the control is terminated after notifying that in step SA90.

  In the infusion start monitoring process described above, the time threshold that is the condition for starting the infusion control in step SA140 and the time threshold that is the condition for executing the alarm operation in step SA160 are the same. These threshold values may not be the same value.

  Further, in the infusion start monitoring process described above, the microcomputer 23 indicates that the effective value based on the power supply frequency signal has changed more than a specific value before the infusion start button is turned on in step SA120. Thus, the clamp 60 is opened, and the liquid solution is regarded as flowing in the infusion line 13 and the subsequent infusion control process is executed. On the other hand, if the change in the value of the power supply frequency signal in the infusion line 13 is equal to or less than the specific value, it is considered that the chemical solution is not flowing in the infusion line 13, and the clamp 60 is closed, and in step SA160. Information is being given.

  That is, the infusion start monitoring process described above is a state in which infusion control can be started by detecting whether the clamp 60 is opened or closed by detecting the opening / closing of the clamp 60 based on the effective value based on the power frequency signal. If it is determined that there is, it can be said that the process performs an alarm operation.

  As described with reference to FIG. 5, in the clamp blockage release determination process (step SA120), it is determined whether or not there has been a change greater than the specific value over a certain period of time (Tm). ing. This is because the power frequency signal changes more than the specific value due to the case where the power frequency signal changes more than the specific value due to the effect of noise that is temporarily seen and the fact that the medicinal solution is flowing in the infusion line 13. This is to distinguish it from what it is. Specifically, this will be described with reference to FIGS.

  6 schematically shows a change in the power supply frequency signal due to the flow of the chemical solution in the infusion line 13, and FIG. 7 schematically shows a change in the power supply frequency signal due to temporary noise. is there. According to the processing of step SA120, step SA130, and step SA150 in FIG. 5, when the power supply frequency signal continues to exceed Tm as shown in FIG. 6, the infusion control is performed in step SA140. Be started. On the other hand, if the value of the power frequency signal does not change more than the specific value, or if the change of the specific value or more is shown only temporarily as shown in FIG. Etc. are notified.

  Next, processing contents when the infusion operation is stopped in the infusion line monitoring system 10 according to the present embodiment will be described with reference to FIG. 8 which is a flowchart of the processing (infusion stop time monitoring process). This process may be performed continuously in the background during the period in which the infusion control process described as step SA140 is performed, or may be performed in the input unit 73 by a medical worker or the like. It may be started as a result of operating a predetermined switch. Further, the flowchart of FIG. 8 includes processing on the infusion line monitoring system 10 side and processing on the medical staff side.

  First, in step SB10, the microcomputer 23 measures an effective value based on the power supply frequency signal, and proceeds to step SB20.

  In step SB20, it is determined whether or not the effective value measured in step SB10 is in a predetermined range, that is, for example, between the lower limit value Vm3 and the upper limit value Vm4. If so, the process proceeds to step SB40. If it is determined that this is not the case, in step SB30, it is informed that measurement of an effective value based on the power supply frequency signal is impossible, and the process is terminated. Note that the significance of the processing of step SB20 and step SB30 is the same as the significance of step SA80 and step SA90.

  In step SB40, the microcomputer 23 measures the effective value based on the power supply frequency signal similarly to step SB20, and advances the process to step SB41.

  In step SB41, the microcomputer 23 determines whether or not an operation for stopping the infusion (an operation to turn off the infusion start button) is performed on the input unit 73. The process proceeds to SB50. When the infusion control started in the infusion control step SA140 is still being executed, the microcomputer 23 ends the control in response to the infusion start button being turned off in step SB41.

Here, normally, the medical staff puts the clamp 60 into a closed state (step SB42).
In step SB50, the microcomputer 23 executes the clamp closure release determination process in the same manner as in step SA120 (see FIG. 5).

  Next, in step SB50, the microcomputer 23 determines whether or not the effective value has changed by the specified value or more. If the microcomputer 23 determines that it has changed, the microcomputer 23 proceeds to step SB60 and determines that it has not changed. The process proceeds to step SB80. Here, if it is determined whether or not there is a change in the amount in the opposite direction (positive and negative) to the determination in step SA120, that is, whether or not there is a change of a specific value or more in the increasing direction in step SA120. In step SB50, it is determined whether or not there is a change greater than a specific value in the decreasing direction.

  In step SB80, the microcomputer 23 determines whether or not the state in which the effective value based on the power supply frequency signal does not change more than the specific value described above continues for a predetermined time Tm or more. If it is determined, the process proceeds to step SB90, and if not, the process proceeds to step SB50.

  In step SB90, the microcomputer 23 checks the detection output of the door opening / closing sensor 70 to determine whether or not the door member 80 is in the open state, and if it is determined to be in the open state, proceeds to SB100. If it is determined that it is in the closed state, the process returns to step SB50.

  In step SB100, the microcomputer 23 is dangerous in that the door member 80 is opened and the infusion line 13 is about to be removed from the infusion pump 50 even though the clamp 60 is open. A notification to that effect (alarm) is made, and the process is terminated.

  That is, in the infusion stop monitoring process, the effective value based on the power supply frequency signal is changed from the value (Vo) measured with the clamp 60 opened in spite of the infusion start button being turned off. When the door member 80 is determined to have been opened for a predetermined time or more and the door member 80 is opened in that state, a warning operation is performed to prompt the clamp 60 to be closed. Made.

  On the other hand, in step SB60, the microcomputer 23 determines whether or not the state in which the effective value based on the power supply frequency signal has changed more than the specific value described above continues for a predetermined time Tm or longer. If it is determined that it is, the process proceeds to step SB70. If it is determined that the process is not continued, the process returns to step SB50.

  In step SB70, the microcomputer 23 checks the detection output of the door opening / closing sensor 70 to determine whether or not the door member 80 is in the open state. If it is not yet open, that is, if it is determined to be closed, the process returns to step SB50.

  In the infusion stop monitoring process described above, the microcomputer 23 determines that the effective value based on the power frequency signal has changed more than a specific value in step SB50 before the infusion start button is turned off. It is considered that the clamp 60 is closed, and thereafter the door member 80 is allowed to be opened (without performing an alarm operation). On the other hand, when no change greater than the above specific value is observed before the infusion start button is turned off, the microcomputer 23 indicates that the door member 80 has been opened in such a state. In such a state, that is, in a state where the clamp 60 is regarded as being in the open state, the infusion line 15 (the drug solution bottle 16 and the infusion line 15) is not attached to the infusion pump 50. In order to avoid this, a warning operation is performed.

  That is, the infusion stop monitoring process described above is the infusion line to the infusion pump 50 after the infusion in the infusion line 15 is stopped by detecting the opening and closing of the clamp 60 based on the effective value based on the power frequency signal. 15 is a process for determining whether or not the release of the attachment of the infusion pump 15 can be permitted, and it is estimated that the clamp 60 is kept open and the removal of the attachment of the infusion line 15 to the infusion pump 50 cannot be permitted. It can be said that this is a process for performing an alarm operation.

  In the present embodiment described above, the microcomputer 23 performs a notification operation in each of Step SA90, Step SA160, and Step SB100. In this notification operation, a message may be displayed on the display unit 72, the display unit 72 may be configured by an LED (Light Emitting Diode), and it may be appropriately lit / flashed. The notification operation may be performed by outputting.

  In the present embodiment, the change in the opening and closing of the clamp 60 indicates whether the amount of change in the effective value based on the power supply frequency signal has changed by a certain value before and after the infusion start button on / off switching operation. It is judged indirectly based on. That is, for example, in the case of step SA120, it is determined whether or not the open state has been established by determining whether or not the infusion start button has been changed by a certain value or more after Vc is turned on, and step SB50. In this case, whether or not the closed state is established by determining whether or not the value has changed from Vo by a specific value (in the direction opposite to the direction determined in step SA120) after the infusion start button is turned off. Has been determined. In the present embodiment, whether or not the alarm operation in step SA160 or step SB100 is executed is determined by a combination of the determination result in each case and the open / closed state of door member 80.

  Further, the change in the opening and closing of the clamp 60 as described above may be determined based on the effective value itself. That is, in the infusion line monitoring system 10, the effective value when the clamp 60 is in the open state and the effective value when the clamp 60 is in the closed state are measured in advance and stored in the storage device 71, and obtained at that time. Even if it is determined whether the clamp 60 is opened or closed depending on which of the effective values is (or whether it is close to which value, or whether there is a change across the threshold value using an intermediate value between the two values) good.

  Note that, as in the present embodiment, it is determined whether the clamp 60 is opened or closed based on the amount of change rather than the absolute value of the effective value, thereby eliminating the need to previously measure the effective value of the open state and the closed state. In addition, even when the absolute value of the effective value based on the power supply frequency signal due to a change in the external electromagnetic environment changes, it is possible to reliably determine whether the clamp 60 has been opened or closed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows typically the structure of the infusion line monitoring system containing the monitoring part which is one Embodiment of the infusion line monitoring apparatus of this invention. It is a figure which shows the structure of the monitoring part of FIG. 1 in detail. It is a front view in the open state of the door member of the infusion pump of FIG. It is a flowchart of the infusion start time monitoring process performed in the infusion line monitoring system of FIG. It is a flowchart of the infusion start time monitoring process performed in the infusion line monitoring system of FIG. It is a figure for demonstrating the content of the clamp obstruction | occlusion open | release determination processing of FIG. It is a figure for demonstrating the content of the clamp obstruction | occlusion open | release determination processing of FIG. It is a flowchart of the monitoring process at the time of the infusion stop performed in the infusion line monitoring system of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Infusion line monitoring system, 11 Power line, 12 Living body, 13 Infusion line, 14 Electrode, 15 Monitoring part, 16 Chemical solution bottle, 20 Variable gain amplifier, 21 Band pass filter, 22 RMS-DC converter, 23 Microcomputer, 50 Infusion Pump, 52 housing, 54 Bubble sensor, 55 Blocking sensor, 56 Hook, 57 Tube mounting part, 57A Blocking sensor, 57B Tube pressing member, 58 Clamp mechanism, 70 Door open / close sensor, 71 Storage device, 72 Display part, 73 Input part , 80 door member, 81 hinge, 82 pressing plate, 84 door lever, 90 motor, 91 finger, 91A first finger, 91B second finger, 91C third finger, 91D fourth finger, 99 pump mechanism, 151 potentiometer Meter, 152 operational amplifier, 900 the external commercial power supply.

Claims (5)

A device for monitoring an infusion line connected to an infusion pump for injecting or perfusing infusion, blood or body fluid into a living body, the flow rate being adjusted by a clamp,
Detecting means for detecting whether a door of a case member that houses a connection portion between the infusion pump and the infusion line is in an open state or a closed state;
A notification means for performing a notification operation;
An electrode provided in the infusion line;
An acquisition means for acquiring a power supply frequency signal generated by electrostatic induction in the living body via the electrode;
Determining means for determining the open / closed state of the infusion line by the clamp based on the power frequency signal acquired by the acquiring means;
An infusion line monitoring apparatus comprising: control means for causing the notifying means to perform a notifying operation when it is determined that the open / closed state of the clamp determined by the determining means does not correspond to the open / closed state of the door.   The infusion line monitoring apparatus according to claim 1, wherein the determination unit calculates an effective value after amplifying the power supply frequency signal, and determines an open / closed state of the clamp based on the effective value. An input means for accepting input of information;
When the effective value of the power supply frequency signal has increased by a certain amount before and after the input of information to the input unit, the determination unit determines whether the clamp state is one of an open state and a closed state. 3. The infusion line according to claim 2, wherein the infusion line is determined to have changed to the other, and if the amount has decreased by a certain amount or more, the state of the clamp is determined to have changed from the other of the open state and the closed state to one. Monitoring device.   The control means sets the open / close state of the clamp when the state in which the amount of change with respect to the input means before the input of information continues to be greater than or equal to the specific amount after the input of information to the input means. The infusion line monitoring device according to claim 3, wherein the infusion line monitoring device is determined. An infusion device for monitoring an infusion line for injecting or perfusing an infusion, blood or body fluid into a living body,
A clamp for adjusting the flow rate of the infusion line is attached to the infusion line,
A pump mechanism for feeding the solution in the infusion line;
An infusion pump comprising the pump mechanism and a housing and a door for housing a part of the infusion line;
Detecting means for detecting opening and closing of the door;
A notification means for performing a notification operation;
An electrode provided in the infusion line;
An acquisition means for acquiring a power supply frequency signal generated by electrostatic induction in the living body via the electrode;
Based on the power frequency signal acquired by the acquisition means, a determination means for determining the open / closed state of the infusion line by the clamp;
An infusion device further comprising: control means for causing the notifying means to perform a notifying operation when it is determined that the open / closed state of the clamp determined by the determining means does not correspond to the open / closed state of the door.

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