JP2013192600A - Tube feeding injection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube feeding injection apparatus having an improved structure capable of realizing the automatic extrusion of a medicine for promoting nutrition from a medicine bag by reduced power consumption.SOLUTION: In a tube feeding injection apparatus 10 provided with pressure control means 50 and 104 for regulating the pressure of a pressurized air chamber 18 by controlling the pressure operation of an electromotive pump 86, the pressure control means 50 and 104 are constituted by a pulse width modulation control means for regulating the pressure rising speed of the pressurized air chamber 18 at the time of the pressure operation of the electromotive pump 86 by altering and setting the duty ratio of the supply voltage to the electromotive pump 86.

Description

  The present invention relates to a tube feeding device used for tube feeding, particularly to a tube feeding device for injecting and feeding a nutrient contained in a nutrient bag to a patient.

  Conventionally, as one of the medical practices to administer nutrition etc. to patients who have difficulty ingesting food but have maintained digestive organ function, tube feeding methods such as PEG nutrition therapy (both enteral nutrition methods) Say). Tube feeding is performed by inserting a tube from outside the body through the nasal cavity, oral cavity, or through a fistula formed in the stomach wall, and injecting a nutrient or the like from outside the body through the tube.

  By the way, the nutrients used in tube feeding are gel or semi-solid to avoid problems such as reflux from the stomach to the esophagus and diarrhea. It is provided as a nutrient bag filled in. At the time of use, after connecting the tube to the opened mouth, the nutrients pushed out by manually pressing the nutrient bag are injected into the body through the tube.

  However, in order to compress the nutrient bag by hand and inject it into the body, caregivers and the like must continue to press the nutrient bag by hand for several tens of minutes. Was extremely large. In addition, it is difficult to press the entire nutrient bag with human hands, the work becomes difficult as the remaining amount of nutrient solution decreases, and the nutrient solution tends to remain in the nutrient bag. there were.

  Therefore, in the previous patent application, Japanese Patent Application Laid-Open No. 2011-24817 (Patent Document 1), the present applicant applied pressure to the nutrient bag by pressurizing the pressurized air chamber with an electric pump. A tube feeding device is proposed. According to this tube feeding device, the nutrient contained in the nutrient bag can be automatically injected into the body of the patient, and the unit of the nutrient is controlled by automatically controlling the pressure exerted on the nutrient bag. It is possible to stabilize the injection amount per hour and to dispense the nutrient from the nutrient bag.

  In such a tube feeding infusion device described in Patent Document 1, power is consumed continuously or intermittently by the pressurization operation of the electric pump that is repeated in the use state. Since it is continuously used for several minutes or several tens of minutes, it has been required to operate with smaller power consumption.

JP 2011-24817 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is an improvement in which automatic extrusion of a nutrient from a nutrient bag can be realized with low power consumption. The object is to provide a tube feeding device of structure.

  That is, according to the first aspect of the present invention, bag pressurizing means including a pressurized air chamber that exerts pressure on the nutrient bag is provided, and air is provided in the pressurized air chamber of the bag pressurizing means. In the tube feeding device, a pressure control means for adjusting the pressure of the pressurized air chamber by controlling the pressurization operation of the electric pump is provided. The control means is configured by pulse width modulation control means for adjusting the pressure rise rate of the pressurized air chamber during the pressurizing operation of the electric pump by changing and setting the duty ratio of the supply voltage to the electric pump. This is a feature.

  According to the tube feeding device having the structure according to the first aspect, the pressurization operation of the electric pump is controlled by the pulse width modulation of the supply voltage, and the pressure increase rate of the pressurized air chamber is adjusted. Therefore, a rapid increase in the pressure of the pressurized air chamber is prevented during the pressurizing operation of the electric pump. Therefore, the durability of the bag pressurizing means provided with the pressurized air chamber is ensured, and the administration route (tube, fistula, etc.) of the nutrient that communicates the internal space of the nutrient bag with the patient's body is abrupt. It is possible to avoid problems such as disengagement at the connecting portion due to an appropriate pressure.

  In addition, since the supply of electric power to the electric pump and the supply stop are alternately switched in a short time, the electric motor of the electric pump is substantially maintained in a rotational operation state by inertia even while the supply of electric power is stopped. Thus, the supply of air from the electric pump to the pressurized air chamber is maintained. Therefore, the electric pump can be operated efficiently with a small amount of power supply, and the power consumption can be reduced while adjusting the pressure increase rate of the pressurized air chamber.

  According to a second aspect of the present invention, in the tube feeding infusion device described in the first aspect, the speed at which the pressure of the pressurized air chamber increases during the pressurizing operation of the electric pump is set in advance. It is adjusted by the pressure control means according to the scheduled injection time from the start of pressing the agent bag to the completion of pressing.

  According to the second aspect, by adjusting the pulse width and frequency (duty ratio) of the voltage supplied to the electric pump, the pressurization speed of the pressurized air chamber by the electric pump can be adjusted. The rate of pressure increase can be adjusted to complete the infusion of nutrients at a set scheduled infusion time. Therefore, the injection of the nutrient can be completed in a predetermined injection time without exerting an excessive pressure on the bag pressurizing means, the nutrient bag, the administration route of the nutrient, and the like.

  According to a third aspect of the present invention, in the tube feeding device described in the first or second aspect, a pressure sensor for detecting the pressure of the pressurized air chamber is provided, and the electric pump is controlled. The pressure increase rate of the pressurized air chamber during the pressure operation is adjusted by the pressure control means based on the detection value of the pressure sensor.

  According to the third aspect, the target injection scheduled time and pressure are adjusted by adjusting the duty ratio of the voltage supplied to the electric pump based on the detected value of the pressure of the pressurized air chamber detected by the pressure sensor. As compared with the case where only the map control based on the upper limit value and the lower limit value is performed, the pressure of the pressurized air chamber can be brought closer to the target pressure with higher accuracy.

  According to a fourth aspect of the present invention, in the tube feeding device described in any one of the first to third aspects, a pressure sensor for detecting the pressure of the pressurized air chamber is provided, The pressure increase rate of the pressurized air chamber during the pressurization operation of the electric pump is calculated every predetermined time, and an abnormal signal is output when the calculated pressure increase rate is smaller than a preset lower limit value of the pressure increase rate Is provided with an abnormality detecting means for outputting.

  According to the fourth aspect, air leakage in the pressurized air chamber, damage to the nutrient bag, loss of the route of administration of the nutrient, and the like are detected as a decrease in the pressure increase rate of the pressurized air chamber. The caregiver can be informed promptly of the occurrence of an abnormality by making a warning sound based on the abnormal signal or notifying a caregiver or the like in a remote place.

  According to the present invention, the pressure control means is configured by pulse width modulation control, and the pressure rise rate of the pressurized air chamber can be adjusted by controlling the duty ratio of the supply voltage. Therefore, it is possible to prevent damage to the bag pressurizing means and nutrient bag due to a sudden increase in pressure in the pressurized air chamber, dropout of the administration route of the nutrient, and the like, thereby improving durability and reliability. . In addition, since the rotor of the electric motor in the electric pump continues to rotate substantially due to inertia even when the voltage supply is stopped, pressurization by the electric motor in the pressurized air chamber is efficiently realized with less power consumption. .

The perspective view which shows the tube feeding injection apparatus as one Embodiment of this invention. The front view of the bag pressurization means which comprises the tube feeding injection apparatus of FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. The perspective view of the injection | pouring control means which comprises the tube feeding injection apparatus of FIG. The block diagram of the injection | pouring control means of FIG. The flowchart explaining the pressure control method by the injection | pouring control means of FIG. The graph which shows the pressure change of the pressurized air chamber in the bag pressurization means of FIG. The graph which shows the electricity supply state to the electric pump in the injection | pouring control means of FIG. The graph which shows another aspect of the pressure change of the pressurized air chamber in the bag pressurization means of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a tube feeding device 10 as one embodiment of the present invention. The tube feeding device 10 includes a pressurizing unit 12 and a control unit 14.

  The pressurization part 12 is comprised including the airbag 16 as a bag pressurization means, as FIG. 2-4 shows. The airbag 16 has a hollow shape including a pressurized air chamber 18 therein, and at least a part thereof is formed of a flexible material. In the present embodiment, the airbag 16 has a sheet-like stretchable surface 20 formed of a flexible synthetic resin material, a rubber material, or the like, and a sheet-like stretchable amount that is less deformable than the stretchable surface 20. The pressure holding surface 22 is overlapped, and the stretchable surface 20 and the outer peripheral edge portion of the pressure holding surface 22 are fixed to each other by bonding, high frequency welding or the like over the entire circumference. Thereby, a part of the wall portion of the pressurized air chamber 18 is configured by the flexible stretchable surface 20, and the volume change of the pressurized air chamber 18 is allowed by deformation of the stretchable surface 20. Further, the other part of the wall portion of the pressurized air chamber 18 is constituted by the pressure holding surface 22 whose deformation amount is limited, so that the internal pressure fluctuation (pressurization and depressurization) of the pressurized air chamber 18 is prevented. Thus, the deformation of the stretchable surface 20 occurs efficiently and with excellent responsiveness.

  The material for forming the stretchable surface 20 is not particularly limited, but a synthetic resin film such as a polyvinyl chloride film or a polyester film, a flexible film formed of a rubber elastic body, or the like may be used alone or in layers. Have been used. Further, the pressure holding surface 22 itself may be formed of a material that is less likely to be deformed than the stretchable surface 20, or is formed of the same material as the stretchable surface 20, and is a separate non-stretchable net or the like. The deformation may be limited by.

  An air supply / exhaust hole 24 is formed through the pressure holding surface 22. The air supply / exhaust hole 24 is a small-diameter circular hole, and an annular connection fitting is attached to the periphery of the opening. Further, one end of a pneumatic pipe line 26 is connected to the air supply / exhaust hole 24, and the pressurized air chamber 18 is connected to an electric pump 86 described later through the pneumatic pipe line 26.

  A holding body 28 is superimposed on the stretchable surface 20 of the airbag 16. The holding body 28 has a sheet shape or a net shape, and an allowable amount of expansion / contraction deformation is set small. In addition, the holding body 28 has a dimension in the longitudinal direction (left-right direction in FIG. 2) smaller than the dimension in the same direction of the stretchable surface 20 and the pressure holding surface 22. Is positioned at the inner side in the longitudinal direction with respect to one end of the stretchable surface 20, and the other end is disposed at substantially the same position in the longitudinal direction with respect to the other end of the stretchable surface 20. ing. Furthermore, the holding body 28 has an end portion in the short direction (vertical direction in FIG. 2) fixed to one end portion in the short direction of the stretchable surface 20, and is provided on the stretchable surface 20 side of the airbag 16. It is attached to cover the surface. A housing space 30 having openings on both sides in the longitudinal direction is formed between the overlapping surfaces of the holding body 28 and the telescopic surface 20, and a part of the wall portion of the housing space 30 is the telescopic surface 20. It is constituted by.

  A hanging string 32 is attached to one end of the airbag 16 in the short direction. Both ends of the hanging strap 32 are fixed in the vicinity of one end of each of the stretchable surface 20 and the pressure holding surface 22 in the longitudinal direction, and the intermediate portion has a sufficient slack.

  The nutrient space 34 is accommodated in the accommodation space 30. The nutrient bag 34 is a hollow body formed using a laminate film in which an aluminum foil is laminated by vapor deposition or the like on a synthetic resin film such as a polyethylene film, and the nutrient solution is accommodated in the internal space. Furthermore, a cylindrical mouth portion communicated with the internal space of the hollow body portion is provided, and the mouth portion is previously sealed with a cap or the like. And in nutrient solution bag 34, after removing a cap etc. and opening a mouth part, a nutrient is pushed out from a mouth part by pressing a hollow body part so that it can take out.

  Furthermore, one end of the tube 36 is fixed to the mouth of the nutrient bag 34. The other end of the tube 36 is connected to a fistula 38 inserted into the patient's body through a fistula. In this embodiment, a connector 40 is provided at the connection portion, and the tube 36 and fistula 38 are attached and detached. Connected as possible. Thereby, by pressing the hollow body portion of the nutrient bag 34, the nutrient filled in the nutrient bag 34 is injected into the body through the tube 36 and the gastrostomy tube 38.

  The structure of the connector 40 that connects the tube 36 and the soot tube 38 is not particularly limited, but from the viewpoint of ease of attachment and detachment, for example, each end on the connection side of the tube 36 and the soot tube 38 is mutually connected. A connector 40 is formed at the connection portion by providing a luer taper corresponding to the above and connecting the luer taper portions with each other in an inserted / extracted state. Although not shown in the figure, a valve body may be provided on the path of the tube 36 and the tubule 38. According to this, the injection of the nutrient into the patient's body and the stoppage of the injection are performed. It can be switched by opening and closing.

  The pressurizing unit 12 is supported by the suspension pole 42 in a state where the nutrient bag 34 is inserted into the accommodation space 30. The suspension pole 42 is a hard columnar member made of metal or the like, and can be self-supported by a leg portion (not shown). In addition, a hook 44 is formed to protrude from the upper end portion of the suspension pole 42, and the suspension portion 32 of the airbag 16 is hooked on the hook 44, so that the pressurizing unit 12 is supported by the suspension pole 42. It has come to be. Note that the suspension pole 42 is not essential, and the pressurizing unit 12 may be supported by hanging the hanging string 32 on a hook provided on the wall surface of the hospital room.

  Further, the airbag 16 of the pressurizing unit 12 is connected to the control unit 14 by a pneumatic pipe 26. The control unit 14 includes an external input / output means 46, an input / output interface 48, and the like, as shown in FIG. 6, in a hollow housing having an inclined upper surface as shown in FIG. The computer system 50 is disposed.

  More specifically, an operation panel 52 constituting the external input / output means 46 is provided on the inclined upper surface of the control unit 14. The operation panel 52 includes a liquid crystal display 54, operation keys 56, and an LED lamp 58.

  The liquid crystal display 54 includes a pressure display unit 60 that displays a pressure value, and the pressure display unit 60 can display an arbitrary two-digit number. Also, above the pressure display unit 60, a time display unit 62 is provided as an elapsed time display means for displaying the total elapsed time from the start of operation, pressurization time, decompression time, etc. It can be digitally displayed with a 2-digit number. Further, a battery remaining amount display unit 64 for displaying the battery remaining amount is provided above the time display unit 62, and a gauge divided into three in an outer frame having a battery shape is provided according to the battery remaining amount. By displaying, the remaining battery level can be visually confirmed. Further, an adapter connection display unit 66 is provided next to the battery remaining amount display unit 64, and the power supply from the outside is visually confirmed by displaying the plug design when power is supplied from the AC adapter 68. It is possible.

  The operation key 56 includes a power switch 70, a pressure setting switch 72, a time setting switch 74, upper and lower selection switches 76a and 76b, a start switch 78, and a stop / mute switch 80. In the present embodiment, the power switch 70 and the upper and lower selection switches 76a and 76b are arranged on the right side of the liquid crystal display 54 in FIG. 5, and the pressure setting switch 72 and the time setting switch 74 are shown in FIG. 54 on the left side. Further, a start switch 78 and a stop / mute switch 80 are disposed below the liquid crystal display 54 in FIG.

The power switch 70 is a switch that switches the power of the control unit 14 on and off, and it is desirable that the power is switched on and off by pressing for a certain period of time to prevent malfunction. The pressure setting switch 72 is for switching to a setting mode for setting a target upper limit value (P _max ), a target lower limit value (P _min ), an upper limit value of the pressurization speed, an upper limit value and a lower limit value of the decompression speed, which will be described later. It is a switch. The time setting switch 74 is a switch for switching to a setting mode for setting a scheduled nutrient solution injection time (T). The upper and lower selection switches 76a and 76b are switches for changing selection items and numerical values in each setting mode of pressure and time. The start switch 78 is a switch for starting an electric pump 86 to be described later and starting supply (pressurization) of air to the airbag 16. The stop / silence switch 80 is a switch for stopping the electric pump 86 to stop the supply of air to the airbag 16 and also to stop and mute a buzzer 94 described later.

  The LED lamp 58 includes a pressurizing lamp 82 provided above the power switch 70 and a stop / end lamp 84 provided between the start switch 78 and the stop / mute switch 80. The pressure lamp 82 is lit in a pressure mode to be described later. On the other hand, the stop / end lamp 84 is lit when the power source of the control unit 14 is on and in a mode other than the pressurizing mode described later. In short, when the power source of the control unit 14 is on, either the pressurizing lamp 82 or the stop / end lamp 84 is lit to indicate whether or not the pressurizing mode is set.

  An electric pump 86 constituting the external input / output means 46 is accommodated in the internal space of the housing. The electric pump 86 is a general air pump, and sends out air when an electric motor (not shown) is operated by energization from the outside. Further, the electric pump 86 communicates with the pressurized air chamber 18 of the airbag 16 through the pneumatic pipe line 26, and the electric pump 86 sends air into the pressurized air chamber 18 through the pneumatic pipe line 26 when energized from the outside. It is like that. Note that the electric pump 86 is configured to switch ON / OFF of the pressurization operation by switching the presence or absence of external power supply by a pump driver 104 described later.

  In addition, the external input / output means 46 has a pressure sensor 88. The pressure sensor 88 is generally known using a piezoelectric element or the like, and can detect the air pressure of the pressurized air chamber 18 continuously or intermittently.

  Further, the external input / output means 46 has an electromagnetic valve 90. The solenoid valve 90 is a valve body that is opened and closed using magnetic force by switching the energized state. The solenoid valve 90 is closed when energized to hold air in the pressurized air chamber 18 in the airbag 16. When not energized, the open operation state is established, and the air in the pressurized air chamber 18 is discharged to the outside through the pneumatic pipe line 26 and the electromagnetic valve 90. Note that the electromagnetic valve 90 is not necessarily clear in the figure, but is provided, for example, on the path of the pneumatic line 26 so that the pneumatic line 26 is short-circuited to the external space at an intermediate portion by an opening operation. . However, the electromagnetic valve 90 may be provided directly on the airbag 16 so that air is discharged without going through the pneumatic line 26 when the electromagnetic valve 90 is opened.

  The external input / output means 46 has a battery. The battery 92 is a general battery such as a manganese dry battery, an alkaline manganese dry battery, or a nickel-hydrogen dry battery, and supplies power to the control unit 14 when the AC adapter 68 is not connected. Yes.

  The external input / output means 46 has a buzzer 94. When the buzzer 94 detects an error such as a failure of the electric pump 86 or the pressure sensor 88, an air leak due to damage to the pneumatic pipe 26, a low battery 92, etc., an error is generated to the user by a warning sound. It is to inform.

  The external input / output means 46 having such a structure is electrically connected to the computer system 50 via an input / output interface 48 as shown in FIG. It is designed to be controlled.

  The input / output interface 48 includes a parallel interface 96 that connects the operation key 56, the LED lamp 58, and the electromagnetic valve 90 to the computer system 50, a sound source circuit 98 that connects the buzzer 94 to the computer system 50 and controls sound generation of an alarm, An LCD controller 100 that controls display by connecting a liquid crystal display 54 to the computer system 50, a power supply circuit 102 that controls power supply from the AC adapter 68 and the battery 92 to the computer system 50, and an electric pump 86 are connected to the computer system 50. A pump driver 104 that is connected to switch operation and a sensor signal processing unit 106 that connects the pressure sensor 88 to the computer system 50 and transmits a measurement result signal are provided.

  The computer system 50 includes a central processing unit (CPU) 98, a memory (RAM) 110, and a memory (ROM) 112. The computer system 50 stores data in the ROM 112 based on data written in the RAM 110. By reading, the external input / output means 46 is controlled via the input / output interface 48. The computer system 50 is provided with a timer / counter 114 as a pressurization timing unit and a stop timing unit.

  The control unit 14 having such a structure is connected to the pressurizing unit 12 by connecting the other end of the pneumatic pipe line 26 connected to the electric pump 86 to the airbag 16. A blower port (not shown) of the electric pump 86 is communicated with the pressurized air chamber 18 of the airbag 16 through the pneumatic pipe line 26. Thereby, the tube feeding injection device 10 provided with the pressurization part 12 and the control part 14 is formed.

  In this tube feeding device 10, when the compressed air is supplied from the electric pump 86 through the pneumatic line 26 to the pressurized air chamber 18 of the airbag 16, the expansion / contraction surface 20 of the airbag 16 bulges and deforms. Thus, the accommodation space 30 is constricted. Thereby, since the nutrient bag 34 inserted and arranged in the accommodation space 30 is sandwiched and compressed between the stretchable surface 20 and the holding body 28, the nutrient contained in the nutrient bag 34 is And is injected through the tube 36 into the patient's body.

  Next, the operation and control of the tube feeding device 10 will be described.

  First, when the power switch 70 of the control unit 14 is pressed, power is supplied to the control unit 14 from the AC adapter 68 and the battery 92, and the control unit 14 is activated in the stop mode. In the stop mode, the stop / end lamp 84 is turned on, and the current pressure value in the airbag 16, the initial time (00:00), the remaining amount of the battery 92, and the connection of the AC adapter 68 are connected to the liquid crystal display 54. A display (only when the AC adapter 68 is connected) is displayed.

  Further, when the pressure setting switch 72 is pressed, the mode is switched to the pressure setting mode. In the pressure setting mode, the display on the pressure display unit 60 of the liquid crystal display 54 is switched to the target upper / lower limit value of pressure, or the upper / lower limit value of the pressurization speed or the decompression speed. In the pressure setting mode, the pressure display unit 60 blinks.

  Then, by pressing the upper and lower selection switches 76a and 76b in the pressure setting mode, the target upper and lower limit values of pressure and the upper and lower limit values of the pressurization speed and the decompression speed can be changed and set. After the setting is completed, the operation returns to the stop mode when a predetermined time elapses without any input from the operation key 56.

  When the time setting switch 74 is pressed, the mode is switched to the time setting mode. In the time setting mode, the time display unit 62 of the liquid crystal display 54 displays a planned time (scheduled injection time) required to complete the extrusion of the nutrient from the nutrient bag 34.

  Then, by pressing the upper and lower selection switches 76a and 76b in the time setting mode, the scheduled injection time can be changed and set. After the setting is completed, the operation returns to the stop mode when a predetermined time elapses without any input from the operation key 56.

Further, when the start switch 78 is pressed in the stop mode and the setting mode, the mode is changed to the pressurization mode. In the pressurization mode, for example, based on the target upper limit value (P _max ) and the target lower limit value (P _min ) of the pressure set in the pressure setting mode, and the scheduled injection time (T) set in the time setting mode. The operation of the electric pump 86 is map-controlled so that the pressure of the pressurized air chamber 18 in the airbag 16 is stably held or increased. In the pressurization mode, by pressing the pressure setting switch 72, the target upper limit value and the target lower limit value of pressure, the upper limit speed and the lower limit speed of pressure increase and decrease are displayed on the liquid crystal display 54, or the time setting switch 74 is set. By pressing, the remaining injection time obtained by subtracting the elapsed time from the set scheduled injection time can be displayed and confirmed.

  The map information for controlling the operation of the electric pump 86 is, for example, the target upper limit value and the target lower limit value of the pressure in the specific tube feeding device 10 including the air bag 16, the nutrient bag 34, the electric pump 86, and the like. It is possible to create a large number of pieces of information on the operating time of the electric pump 86 that realizes the set values of the various combinations in advance through experiments or the like. At that time, the duty ratio (described later) in the pulse width modulation control of the electric pump 86 may be constant over the entire operation time or may change within the operation time. Then, according to the input target upper limit value, target lower limit value, and operating time, the control data (map information) of the electric pump 86 that realizes the target operation is read, and the electric pump 86 is It can be activated.

  Further, when the scheduled injection time has elapsed from the transition to the pressurization mode and the completion of the injection of the nutrient is detected, the electric pump 86 is stopped and the energization to the electromagnetic valve 90 is stopped. By opening 90, the air in the airbag 16 is discharged and the pressurized air chamber 18 is decompressed. Further, the pressure lamp 82 is turned off and the stop / end lamp 84 is turned on. Thus, the transition from the pressurization mode to the stop mode is completed. Note that an end notification sound may be generated by the buzzer 94. In this case, the end notification sound of the buzzer 94 may be stopped by pressing the stop / mute switch 80 after the transition to the stop mode. it can.

  Furthermore, in the pressurization mode, the pressurization mode can be forcibly terminated by pressing the stop / mute switch 80. In this case, the pressurization lamp 82 is turned off and the stop / end lamp 84 is turned on, and the electric pump 86 is stopped and exhausted by the electromagnetic valve 90. However, the buzzer 94 does not sound a warning sound.

  In addition, when it is detected that the remaining amount of the battery 92 is low in each of the stop, setting and pressurization modes, an error is displayed on the liquid crystal display 54 and an error warning sound by the buzzer 94 is emitted. The error display on the liquid crystal display 54 is realized, for example, by displaying “E” on the pressure display unit 60. Further, an alarm due to an error can be stopped by pressing the stop / mute switch 80.

  In the stop mode, when a predetermined time has passed without any input from the operation key 56, a warning sound from the buzzer 94 alerts the user to forget the operation. Thereby, useless power consumption due to forgetting to turn off the power can be prevented. The warning sound can be stopped by pressing the stop / mute switch 80. In addition to sounding a warning sound, it may be set so that the power is automatically turned off, and power saving can be realized more advantageously.

  Further, the power source of the control unit 14 can be switched off by pressing the power switch 70. Thereby, the data stored in the RAM 110 and the timer / counter 114 of the computer system 50 is reset, and the display on the liquid crystal display 54, the alarm of the buzzer 94, and the lighting of the LED lamp 58 are stopped. In addition, when using again, the power switch 70 should be pushed and the power supply of the control part 14 should just be turned on.

  In addition, in the tube feeding infusion apparatus 10, the electric pump 86 is automatically controlled in the pressurization mode, so that the poor feeding of the nutrient due to the pressure drop is prevented. Hereinafter, one mode of pressure control in the pressurizing mode will be described in detail with reference to FIG.

  First, by shifting to the pressurizing mode, power is supplied to the electric pump 86 in step (hereinafter, S) 1 and the pressurizing operation of the electric pump 86 is started. Thereby, air is sent from the electric pump 86 to the pressurized air chamber 18 of the airbag 16 through the pneumatic pipe line 26, and the pressure of the pressurized air chamber 18 rises.

  In S2, the pressure lamp 82 is turned on substantially simultaneously with the operation of the electric pump 86. Thereby, the user can visually confirm the transition of the control unit 14 to the pressurization mode.

  In S3, the measurement of the elapsed time from the transition to the pressurizing mode is started by the timer / counter 114 of the computer system 50, and the measured pressurizing operation time is stored by the timer / counter 114. The elapsed time in the pressurization mode measured by the timer / counter 114 is displayed on the time display unit 62.

  In S <b> 4, the pressure (P (t)) at an arbitrary time (t) is detected by the pressure sensor 88 and the detected value is stored in the computer system 50.

  Further, in S5, the pressure (P (t + Δt)) after a predetermined time (Δt) has elapsed from an arbitrary time (t) is detected by the pressure sensor 88, and the detected value is stored in the computer system 50.

In S 6, the central processing unit 108 calculates the pressure increase rate (v ₁ ) in a predetermined time width (Δt). The pressure increase rate can be calculated by dividing the difference between the pressure detected at S5 (P (t + Δt)) and the pressure detected at S4 (P (t)) by Δt.

Next, in S7, it is determined whether or not the pressure increase speed (v ₁ ) calculated in S6 is equal to or higher than a preset lower limit speed (u ₁ ) of pressure increase (v ₁ ≧ u ₁ ). By determining at 50, the presence or absence of abnormality such as air leakage is confirmed. In the present embodiment, the abnormality detection means is configured to include the computer system 50, the pressure sensor 88, and the sensor signal processing unit 106.

If the determination result in S7 is v ₁ <u ₁ , there is a possibility that a problem such as air leakage may have occurred, so the control unit 14 is automatically stopped and a transition is made to the stop mode. That is, when an abnormal signal is output from the computer system 50 to the input / output interface 48, the pump driver 104 stops the electric pump 86 in S8. Further, in S9, the LCD controller 100 displays an error on the liquid crystal display 54, and in S10, the sound source circuit 98 generates a warning sound by the buzzer 94. In S20 described later, the LED lamp 58 is controlled by the parallel interface 96, the pressure lamp 82 is turned off, and the stop / end lamp 70 is turned on, whereby the transition to the stop mode due to an error is completed. .

  As described above, when the air bag 16 and the nutrient bag 34 are torn, or when troubles such as disconnection of the nutrient solution injection path constituted by the tube 36 and the tub tube 38 occur, the pressure increase rate of the pressurized air chamber 18 is increased. Focusing on the reduction of the above, the occurrence of the abnormality as described above is automatically detected. In addition, when an abnormality is detected, an abnormality signal is output and the operation of the tube feeding device is automatically stopped, and the abnormality is promptly indicated to the user by the lighting of a lamp or the sound of a warning sound. To be notified. Therefore, the nutrient 16 is externally introduced by continuing to pressurize the nutrient bag 34 or the nutrient solution injection path due to insufficient infusion of the nutrient solution into the patient due to damage to the air bag 16. It is possible to prevent leaks.

On the other hand, when the determination result in S7 is v ₁ ≧ u ₁ , it is determined that there is no problem such as air leakage, so the pressurization mode is continued. That is, in S11, the electric pump 86 is determined by determining whether or not the predetermined time (T ₁ ) set in advance is equal to or less than the elapsed time (t + Δt) since the start of the pressurization mode (T ₁ ≦ t + Δt). It is determined whether or not to stop.

That is, when the determination result in S11 is T ₁ > t + Δt, the process from S5 is executed again after t = t + Δt in S12, and abnormality detection such as air leakage is repeatedly performed every predetermined time. In addition, while the process of S5-S11 is repeated, since the pressurization mode by the electric pump 86 is maintained, the air pressure in the airbag 16 gradually rises.

On the other hand, if the determination result in S11 is T ₁ ≦ t + Δt, in S13, the computer system 50 outputs a stop signal to the pump driver 104, and the pump driver 104 stops the electric pump 86. Thereby, the pressure in the airbag 16 falls gradually. Since the nutrient solution is continuously pushed out from the nutrient solution bag 34 by the pressure of the air bag 16 even after the electric pump 86 is stopped, the volume of the nutrient solution bag 34 gradually decreases, and the pressurized air chamber 18 This is because a change in volume is allowed.

Note that the determination method for determining the operation of the electric pump 86 in S11 is merely an example. For example, a target upper limit value (P _max ) of pressure is set in advance, and the detection detected by the pressure sensor 88 is performed. The determination based on the detected pressure value may be performed, such as stopping the pressurizing operation of the electric pump 86 when the pressure in the compressed air chamber 18 reaches the target upper limit value.

  Further, after setting t ′ = t + Δt in S14, the pressure (P (t ′ + Δt ′)) after a predetermined time (Δt ′) has elapsed in S15 is detected by the pressure sensor 88, and the detected value is detected by the computer system 50. Remember me.

  In step S16, the central processing unit 108 calculates the pressure decrease rate (v2) in a predetermined time width (Δt ′). The pressure decrease rate can be calculated by dividing the difference between the pressure detected in S15 (P (t ′ + Δt ′)) and the pressure detected in S5 (P (t ′)) by Δt ′.

Next, in S17, the computer system determines whether or not the pressure drop speed (v ₂ ) calculated in S15 is equal to or lower than a preset upper limit speed (u ₂ ) of pressure drop (v ₂ ≦ u ₂ ). By determining at 50, the presence or absence of abnormality such as air leakage is confirmed.

If the determination result in S17 is v ₂ > u ₂ , there is a possibility of air leakage. Therefore, the control unit 14 is automatically stopped by the processing of S7 to S10 and S20, and shifts to the stop mode due to an error. To do.

  That is, in the case where troubles such as breakage of the air bag 16 and the nutrient solution bag 34 and disconnection of the nutrient solution injection path constituted by the tube 36 and the tub tube 38 occur, the pressure decreasing speed of the pressurized air chamber 18 is increased. Therefore, the occurrence of an abnormality is automatically detected by the determination as described above. In addition, when an abnormality is detected, an abnormal signal is output in the same manner as during pressurization, and the operation of the tube feeding infusion device is automatically stopped, and the abnormality is lit to the user. Notification is made promptly by the sound of a warning sound. Therefore, the nutrition bag 34 is not sufficiently injected into the patient due to the damage of the air bag 16 or the nutrient bag 34 is continuously pressed in a state in which the nutrient bag 34 or the nutrient solution injection path is defective. Can prevent the nutrient from leaking outside.

On the other hand, if the determination result in S17 is v ₂ ≦ u ₂ , it is determined that there is no air leakage, and the pressurization mode is continued. In S18, a predetermined time (T ₂ ) set in advance and the duration (t ′ + Δt ′) of the pressurization mode are compared to determine whether T ₂ ≦ t ′ + Δt ′. Thus, it is determined whether or not the electric pump 86 is stopped.

When the determination result in S18 is T ₂ > t ′ + Δt ′, the nutrient injection has not been completed. Therefore, in S19, t ′ = t ′ + Δt ′ is set, and then the processing from S15 is executed again. Abnormality detection such as air leakage is repeated every predetermined time.

On the other hand, when the determination result in S18 is T ₂ ≦ t ′ + Δt ′, since the injection of the nutrient has been completed, an end signal is output from the computer system 50 to the input / output interface 48 in S20. In S20, the pressure lamp 82 is turned off and the stop / end lamp 84, which is an end notification means, is turned on. With this, the pressurization mode is automatically terminated and the operation mode is shifted to the stop mode. At substantially the same time as S20, the electromagnetic valve 90 is opened and the pressurized air chamber 18 is depressurized. The computer system 50 including the timer / counter 114 constitutes end detection means.

  In such a tube feeding device 10, in the pressurizing mode, the energization to the electric pump 86 is controlled by the pump driver 104 by a pressure control means to be described later, and the pressure increase rate of the pressurized air chamber 18 is adjusted. Thus, the nutrient injection operation is completed at a predetermined injection completion time: T. This can be confirmed from FIG. 8 showing the change in pressure with time in the pressurized air chamber 18 as a line graph and FIG. 9 showing as a bar graph the change with time in the supply voltage to the electric pump 86. Note that the two-dot chain line in FIG. 8 represents the pressure change rate. The graphs shown in FIGS. 8 and 9 are models for easily explaining the operation of the tube feeding device 10 according to the present embodiment, and may be different from actual control.

That is, in the tube feeding infusion device 10, as shown in FIG. 8, the pressure in the pressurized air chamber 18 greatly increases during a predetermined time: Δt ₁ from the start of the pressurizing mode. Such a pressure increase in a short time is realized by pressurizing the electric pump 86 in a state where the tube 36 and the pipe 38 are blocked by a valve (not shown) provided on the path. Further, as shown in FIG. 9, electric power is continuously supplied to the electric pump 86 until the predetermined time: Δt ₁ elapses, and the electric pump 86 is pressurized air chamber with maximum efficiency. Actuate to pressurize 18.

When a predetermined time: Δt ₁ has elapsed from the start of the pressurization mode, the valve is opened, and the nutrient bag 34 is communicated with the patient's body through the tube 36 and the tubal tube 38. As a result, the nutrient solution is pushed out of the nutrient solution bag 34 and injected into the patient's body, so that the volume change of the nutrient solution bag 34 is allowed to some extent, and the pressure increase in the pressurized air chamber 18 is moderated. In this embodiment, when the predetermined time: Δt ₁ has elapsed, the pressure of the pressurized air chamber 18 reaches a preset target lower limit value _Pmin of pressure.

Further, in the tube feeding infusion device 10, the power supply to the electric pump 86 is controlled by the pump driver 104, so that the pressure control means for adjusting the pressure of the pressurized air chamber 18 serves as the pulse width modulation control means. The computer system 50 and the pump driver 104 are included. That is, as shown in FIG. 9, in a pulse waveform of electric power supplied to the electric pump 86 by the computer system 50 and the pump driver 104 until a predetermined time: Δt ₂ elapses from the opening of the valve. Pulse width modulation control (PWM control) for adjusting the duty ratio to a predetermined value less than 100% is executed.

  The pulse width modulation control repeats the power supply state and the supply stop state for the electric motor constituting the electric pump 86 every short time, and adjusts the ratio (duty ratio) between the supply state and the supply stop state. Thus, the substantial power supply to the electric motor is adjusted. In this embodiment, the computer system 50 and the pump driver 104 execute the pulse width modulation control, so that the pulse width modulation control means includes the computer system 50 and the pump driver 104. Further, in the pulse width modulation control, the power supply state and the supply stop state are alternately switched in a short time, so that the rotor of the electric motor continues to rotate due to inertia even in the supply stop state. Air is continuously sent to the pressurized air chamber 18.

Thus, the substantial energization time for the electric pump 86 is controlled by the computer system 50 and the pump driver 104, and the operating efficiency of the electric pump 86 is adjusted, so that the pressure of the pressurized air chamber 18 and the rate of pressure increase are increased. Adjusted. In the present embodiment, the pressure of the pressurized air chamber 18 reaches the target upper limit value P _max after a predetermined time: Δt ₂ has elapsed. As described above, the supply voltage to the electric pump 86 is adjusted by the pulse width modulation control by the computer system 50 and the pump driver 104, and the pressure control means of this embodiment includes the computer system 50 and the pump driver 104. Has been.

In the present embodiment, a voltage having a substantially constant pulse width is supplied at a substantially constant frequency. However, the pulse width of the supply voltage is made variable in accordance with a change in pressure of the pressurized air chamber 18 or the like. The duty ratio of the supply voltage may be changed at a predetermined time: Δt ₂ . In short, in this embodiment, the pressure increase rate of the pressurized air chamber 18 is substantially constant. However, by adjusting the pressure increase rate of the pressurized air chamber 18 according to the detection value of the pressure sensor 88 or the like, a predetermined value is obtained. The pressure of the pressurized air chamber 18 after the time: Δt _{2 has} elapsed can be made closer to the set upper limit value: P _max with higher accuracy.

In addition, energization of the electric pump 86 is stopped after a predetermined time: Δt ₂ . As a result, the pressurization of the pressurized air chamber 18 by the electric pump 86 is stopped, and the pressure of the pressurized air chamber 18 decreases as the nutrient is pushed out of the nutrient bag 34. Then, after a lapse of a predetermined time: Δt ₃ from the stop of the electric pump 86, the entire amount of the nutrient in the nutrient bag 34 is pushed out, and the operation of injecting the nutrient into the body is completed. Note that the predetermined time T ₁ in the flowchart shown in FIG. 7 is the sum of Δt ₁ and Δt ₂ in FIGS. Furthermore, the predetermined time: T ₂ in the flowchart shown in FIG. 7 is the sum of Δt ₁ , Δt _2, and Δt ₃ in FIGS. 8 and 9, and is the same as the predetermined time: T.

  In the tube feeding device 10 configured as described above according to the present embodiment, the computer system 50 and the pump driver 104 change the pressure increase rate of the pressurized air chamber 18 to the duty ratio of the voltage supplied to the electric pump. The pressure control unit is configured by functioning as a pulse width modulation control unit that adjusts by setting. Therefore, the air bag 16 and the nutrient bag 34 are damaged due to a sudden pressure increase in the pressurized air chamber 18, the connection portion between the nutrient bag 34 and the tube 36, and the connection between the tube 36 and the tub tube 38. Omission of the nutrient solution administration route in the portion (connector 40) is prevented, and durability and reliability are improved.

  In particular, in the present embodiment, the pressurized air chamber 18 is gently pressurized as the nutrient solution is discharged from the nutrient bag 34, and the pressure of the pressurized air chamber 18 reaches the target maximum value only once. So that it is controlled. Therefore, as compared with the case where the nutrient bag 34 can be pressed according to the remaining amount of the nutrient, and the pressure of the pressurized air chamber 18 is controlled to repeatedly increase until reaching the target maximum value. Thus, the durability of the air bag 16 and the nutrient solution bag 34 and the reliability of the administration route of the nutrient solution can be advantageously realized.

  In addition, since the supply of voltage to the electric pump 86 and the supply stop are alternately repeated in a short time, the rotor of the electric motor constituting the electric pump 86 is maintained in the rotating operation by inertia even when the voltage supply is stopped. The Therefore, the electric pump 86 is pressurized and operated with excellent energy efficiency, and power saving is realized.

  Moreover, in this embodiment, the voltage supply to the electric pump 86 is terminated before the entire amount of the nutrient is pushed out of the nutrient bag 34, and more effective power saving is achieved. .

As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the transition of the pressure in the pressurized air chamber in the embodiment shown in FIG. 8 is merely an example, and actual pressure control is not necessarily limitedly interpreted. That is, in the above embodiment, the pressure of the pressurized air chamber 18 is controlled to increase from the target minimum value: P _min to the target upper limit value: P _max . For example, during a predetermined time: Δt ₂ The pressurized air chamber 18 may be maintained at a substantially constant pressure, or may be controlled so that the pressure gradually decreases.

  Further, the pressurization of the pressurized air chamber 18 by the electric pump 86 is stopped before the entire amount of the nutrient solution is pushed out, but the electric pump 86 is kept to be pressurized until the whole amount of the nutrient solution is pushed out. You may control.

Furthermore, in the above embodiment, the injection of nutrients is completed by the pressurized state of the pressurized air chamber 18 for a predetermined time: Δt ₂ and the reduced pressure state of the pressurized air chamber 18 for a predetermined time: Δt _3. However, for example, as shown in FIG. 10, it is possible to control the injection of the nutrient solution to be completed by repeating the pressurization state a plurality of times. In addition, when repeating a pressurization state as mentioned above, it cannot be overemphasized that the frequency | count of repeating is not limited.

  In addition, as a means of notifying an error or termination when an abnormality such as an air leak occurs or when a nutritional supplement is completed, an alarm by a buzzer, display on a liquid crystal display, turning on / off an LED lamp, PHS or pocket Notification such as e-mail may be transmitted to a terminal such as a bell or a computer.

  In addition, the airbag 16 does not necessarily have to include the expansion / contraction surface 20 and the pressure holding surface 22, and is formed of the same material as a whole so as to be deformed substantially uniformly as the pressure of the pressurized air chamber 18 increases. It may be.

10: Tube feeding device, 16: Air bag (bag pressurizing means), 18: Pressurized air chamber, 34: Nutrient bag, 50: Computer system (pressure control means, pulse width modulation control means, abnormality detection means) ), 86: Electric pump, 88: Pressure sensor, 104: Pump driver (pressure control means, pulse width modulation control means)

Claims (4)

A bag pressurizing means having a pressurized air chamber for exerting pressure on the nutrient bag is provided, and an electric pump for supplying air is connected to the pressurized air chamber of the bag pressurizing means, In the tube feeding infusion device provided with pressure control means for adjusting the pressure of the pressurized air chamber by controlling the pressurization operation of the electric pump,
The pressure control means is configured by pulse width modulation control means for adjusting the pressure rise rate of the pressurized air chamber during the pressurizing operation of the electric pump by changing and setting the duty ratio of the supply voltage to the electric pump. A tube feeding device characterized by that.   The pressure increase rate of the pressurized air chamber during the pressurizing operation of the electric pump is adjusted by the pressure control means according to a preset injection time from the start of pressing the nutrient bag to the completion of pressing. The tube feeding device according to claim 1.   A pressure sensor for detecting the pressure of the pressurized air chamber is provided, and the pressure increase rate of the pressurized air chamber during the pressurizing operation of the electric pump is controlled based on the detected value of the pressure sensor. The tube feeding device according to claim 1 or 2, which is adjusted by means.   A pressure sensor for detecting the pressure of the pressurized air chamber is provided, and the pressure increase rate of the pressurized air chamber during the pressurizing operation of the electric pump is calculated every predetermined time, and the calculated pressure increase The tube feeding infusion device according to any one of claims 1 to 3, further comprising abnormality detection means for outputting an abnormality signal when the speed is smaller than a preset lower limit value of the pressure increase speed.

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