WO2014045328A1

WO2014045328A1 - Infusion pump

Info

Publication number: WO2014045328A1
Application number: PCT/JP2012/006059
Authority: WO
Inventors: 朋子上村
Original assignee: テルモ株式会社
Priority date: 2012-09-24
Filing date: 2012-09-24
Publication date: 2014-03-27

Abstract

[Problem] To provide an infusion pump that can deliver a medicine accurately in correspondence with changes in ambient temperature by changing and re-setting, at the time of using the infusion pump, the delivery amount of the medicine in accordance with the ambient temperature. [Solution] This infusion pump (1) comprises: a motor (61) that feeds a medicine (171) in an infusion tube (200) by pressing the infusion tube (200); a control unit (100) that controls the motor (61); and a temperature sensor (180) that detects the ambient temperature of the infusion pump (1). At predetermined time intervals (e.g., one minute), the control unit (100): refers to a flow-rate correction value table (RT) indicating flow-rate correction values (BR) which are for when the medicine (171) is made to flow in the infusion tube (200) and which are determined in advance in correspondence with ambient temperatures; converts the ambient temperature obtained from the temperature sensor (180) into a flow-rate correction value (BR); and determines the speed for controlling the motor (61) on the basis of the flow-rate correction value (BR).

Description

Infusion pump

The present invention relates to an infusion pump for delivering a medicine to a patient.

The infusion pump is used, for example, in an intensive care unit (ICU) or the like, and is used to perform a liquid feeding treatment for a patient for a long time with high accuracy. A predetermined drug bag (infusion bag) is arranged on the infusion pump, and an infusion tube lowered from the drug bag is sandwiched between the main body and the door, and the infusion tube is accommodated in the main body. The door is held by closing the door. In the main body of the infusion pump, the outer peripheral surface of the infusion tube set at a fixed position is sandwiched between a plurality of fingers in the main body and the inner surface of the door. This infusion pump is a peristaltic infusion pump that feeds a drug by sequentially pressing a plurality of fingers along the length of the outer peripheral surface of the infusion tube (see Patent Document 1).

In the infusion pump described in Patent Document 1, a flexible infusion tube is used. The rigidity of the infusion tube varies depending on the environmental temperature at which the infusion pump is used. For this reason, when operating the drive motor to deliver the drug in the infusion tube, if the ambient temperature using the infusion pump is detected and the detected temperature is within a predetermined temperature range, By multiplying the reference rotation speed of the drive motor by a correction coefficient determined corresponding to a predetermined temperature range, the rotation speed of the drive motor is corrected to determine the amount of liquid to be delivered.
That is, the ambient temperature is detected, the required rotational speed of the drive motor is calculated, and feedback control is performed.

Japanese Patent No. 3865449

However, in conventional infusion pumps, if the drive motor is operated to deliver the drug in the infusion tube, the ambient temperature of the infusion pump is affected by the heat generated by the drive motor and circuit board during use. May go up steadily. In this case, the correction of the rotational speed of the drive motor is difficult to follow in accordance with changes in the environmental temperature, and the amount of medicine delivered by the infusion tube cannot be calculated each time and accurately changed and set again.
In addition, when the place where the infusion pump is used is moved from the ward to the operating room, the environmental temperature may rapidly increase. Also in this case, the correction of the rotational speed of the drive motor is difficult to follow in accordance with changes in the environmental temperature, and the amount of medicine delivered by the infusion tube cannot be calculated and changed accurately and cannot be set again. .
Therefore, when using an infusion pump, the present invention quickly determines an appropriate rotation speed of the drive motor without changing the calculation following the ambient temperature, and changes and sets the amount of liquid delivered. An object of the present invention is to provide an infusion pump that can accurately deliver a drug in response to changes in environmental temperature.

The infusion pump of the present invention is an infusion pump for delivering a medicine to a patient through an infusion tube, a motor that pushes the infusion tube and sends the medicine in the infusion tube, and a controller that controls the motor A temperature sensor that detects an environmental temperature of the infusion pump, and the control unit is configured to flow the medicine into the infusion tube that is predetermined corresponding to the environmental temperature at predetermined time intervals. A flow rate correction value table showing the flow rate correction value, and converting the environmental temperature obtained from the temperature sensor into a flow rate correction value, and determining a control speed of the motor based on the flow rate correction value; It is characterized by that.
According to the above configuration, the control unit refers to the flow rate correction value table indicating the flow rate correction value when the drug is allowed to flow through the predetermined infusion tube corresponding to the environmental temperature for each predetermined time interval. The environmental temperature obtained from the sensor is converted into a flow rate correction value, and the control speed of the motor is determined based on the flow rate correction value. As a result, when using an infusion pump, the drug can be accurately delivered in response to changes in the environmental temperature by quickly following the environmental temperature and resetting the optimal amount of the drug to be delivered. it can.

Preferably, the control unit selects a reference initial value of the flow rate correction value in the temperature range of 18 ° C. to 42 ° C., and sets the flow rate correction value when the environmental temperature is less than 18 ° C. The control speed of the motor is increased by setting it larger than the reference initial value, and the control speed of the motor is set by setting the flow rate correction value when the environmental temperature exceeds 42 ° C. to be smaller than the reference initial value. It is characterized by lowering.
According to the above configuration, the flow rate correction value is divided into a temperature range in which the flexibility of the infusion tube is substantially constant between 18 ° C. and 42 ° C., a temperature range below 18 ° C., and a temperature range exceeding 42 ° C. Therefore, the medicine can be accurately delivered following the environmental temperature when using the infusion pump.

Preferably, the flow rate correction value table is stored in a memory of the control unit.
According to the above configuration, the control unit can accurately deliver the medicine following the environmental temperature when using the infusion pump only by referring to the flow rate correction value table stored in the memory of the control unit. it can.

Preferably, it has a liquid feeding drive unit that feeds the medicine in the infusion tube while pressing the infusion tube in the longitudinal direction, and the liquid feeding drive unit includes a plurality of cams that are rotated by the operation of the motor. And a plurality of fingers for feeding the medicine in the infusion tube while pushing the infusion tube in a longitudinal direction by moving separately by rotation of the plurality of cams and pushing the infusion tube. It is characterized by.
According to the above configuration, by increasing or decreasing the motor control speed in accordance with the environmental temperature at predetermined time intervals, the infusion tube is infused according to the environmental temperature while the plurality of fingers press the infusion tube. It is possible to send an appropriate liquid feeding amount with the tube condition corrected.

Preferably, a display unit for displaying information and an operation panel unit having operation buttons are arranged on an upper part of the main body of the infusion pump, and a lower part of the main body of the infusion pump is a region in which the infusion tube is arranged. It is characterized by being.
According to the said structure, the medical worker can perform the liquid feeding operation | work of the chemical | medical agent by an infusion pump, confirming the information of the display part of the upper part of a main body. Then, the medical worker can operate the operation buttons on the operation panel unit while confirming the information on the display unit on the upper part of the main body.

When using an infusion pump, the present invention quickly determines an appropriate rotation speed of the drive motor without changing the calculation following the ambient temperature, and changes and resets the amount of the drug delivered. Thus, it is possible to provide an infusion pump capable of accurately delivering a drug in response to a change in environmental temperature.

The perspective view which shows preferable embodiment of the infusion pump of this invention. The figure which looked at the infusion pump shown in Drawing 1 from the W direction. The perspective view which shows the state which opened the opening-and-closing cover of the infusion pump. The figure which shows the electrical structural example of an infusion pump. The figure which shows the liquid feeding drive part of the mid press system which presses by squeezing an infusion tube and liquid-feeds the chemical | medical agent in an infusion tube. The flowchart which shows the precision error correction example of the temperature dependence of the infusion tube in the infusion pump of embodiment of this invention. The figure which shows the example of the temperature correction value table previously memorize | stored in ROM of the control part.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.
FIG. 1 is a perspective view showing an infusion pump which is a preferred embodiment of the infusion pump of the present invention. FIG. 2 is a view of the infusion pump shown in FIG. 1 as viewed from the W direction.

The infusion pump 1 shown in FIG. 1 and FIG. 2 is used in, for example, an intensive care unit (ICU, CCU, NICU) and the like, for example, an anticancer agent, an anesthetic agent, a chemotherapeutic agent, a blood transfusion, etc. This is a micro continuous infusion pump that is used to perform a micro infusion treatment of a drug such as an agent (also referred to as a drug solution) for a relatively long time with high accuracy. This infusion pump 1 is used, for example, for selecting a drug to be used from a drug library and feeding the selected drug. This drug library is drug information which is a drug administration setting group including drug names registered in advance in the drug library database (DB). By using this drug library, a medical worker does not have to perform complicated administration settings each time, and can select a drug and set a drug.

As shown in FIG. 2, the infusion pump 1 can accurately deliver liquid to the patient P from the medicine bag 170 filled with the medicine 171 via the clamp 179, the infusion tube 200, and the indwelling needle 172. The drug is also called an infusion. An infusion tube is also called an infusion line.
The infusion pump 1 has a main body cover 2 and a handle 2T, and the handle 2T can be extended in the N direction or stored in the T direction. The main body cover 2 is also called a main body, and is integrally formed of a molded resin material having chemical resistance, and can be prevented from entering the infusion pump 1 even if a drug or the like is applied. have. As described above, the main body cover 2 has the drip-proof treatment structure because the medicine 171 in the medicine bag 170 disposed above spills out or disinfects the disinfecting liquid used in the vicinity. Because there is.

First, the elements disposed on the main body cover 2 of the infusion pump 1 will be described.
As shown in FIGS. 1 and 2, a display unit 3 and an operation panel unit 4 are arranged on the upper portion 2 A of the main body cover 2. The display unit 3 is an image display device, and uses, for example, a color liquid crystal display device. This display unit 3 can display not only information notation in Japanese but also information in a plurality of foreign languages as required. The display unit 3 is disposed on the upper left side of the upper portion 2 A of the main body cover 2 and above the opening / closing cover 5. The upper portion 2 A of the main body cover 2 is an upper half portion of the main body cover 2. The lower part 2 B of the main body cover 2 is a lower half part of the main body cover 2.

A display portion 3 for displaying information and an operation panel portion 4 having a plurality of operation buttons are arranged on the upper portion 2A of the body cover 2 of the infusion pump 1, and a lower portion 2B of the body cover 2 of the infusion pump 1 is This is a region where an infusion tube 200 which is a liquid feeding member for feeding a medicine is arranged. Thereby, the medical worker can perform the liquid feeding operation of the medicine by the infusion pump 1 while confirming the information on the display unit 3 of the upper portion 2A of the main body cover 2. Then, the medical staff can operate the operation buttons on the operation panel unit 4 while checking the information on the display unit 3 of the upper portion 2A of the main body cover 2. For this reason, the operability of the infusion pump 1 is good.

In FIG. 2, for example, the display unit 3 includes a display column 3B for a scheduled dose (mL) of drug administration, a display column 3C for an accumulated dose (mL) of drug administration, a display column 3D for a charge history, and a flow rate (mL / h). In the display section 3 shown in FIG. 1, illustration of these display contents is omitted for simplification of the drawing. The display unit 3 can also display a warning message.
The operation panel unit 4 is disposed on the right side of the display unit 3 in the upper part 2A of the main body cover 2, and the operation panel unit 4 includes, for example, a pilot lamp 4A, a fast-forward switch button 4B, and a start button as illustrated in FIG. A switch button 4C, a stop switch button 4D, a menu selection button 4E, a power switch 4F, and the like are arranged.

As shown in FIG. 1, an opening / closing cover 5 serving as a lid member is provided on the lower portion 2B of the main body cover 2 so as to be openable and closable in the R direction around a rotating shaft 5A. The open / close cover 5 is a plate-like lid member that is formed long along the X direction. The tube mounting part 50 and the liquid feeding drive part 60 are disposed inside the opening / closing cover 5. An infusion tube 200 made of a flexible thermoplastic resin such as polybutadiene is set in the tube mounting portion 50, and the opening and closing cover 5 is closed. It can be mounted horizontally along the direction (T direction).
Note that the X direction, the Y direction, and the Z direction in FIGS. 1 and 2 are orthogonal to each other, and the Z direction is the vertical direction. The X direction is parallel to the T direction, which is the liquid feeding direction, and is the left-right direction of the infusion pump 1. The Y direction is the front-rear direction of the infusion pump 1.

FIG. 3 is a perspective view showing a tube mounting portion 50 for opening the opening / closing cover 5 of the infusion pump 1 shown in FIGS. 1 and 2 and mounting the infusion tube 200.
As shown in FIG. 3, the tube mounting part 50 and the liquid feeding drive part 60 are provided on the main body lower part 1B side of the infusion pump 1, and the tube mounting part 50 and the liquid feeding drive part 60 are operated with the display part 3. A lower portion of the panel portion 4 is provided along the X direction. As shown in FIG. 2, the tube mounting portion 50 can cover the open / close cover 5 with the open / close cover 5 when the open / close cover 5 is closed in the CR direction around the rotation shaft 5A.

A medical worker can close the open / close cover 5 by attaching the infusion tube 200 to the tube attachment portion 50 while confirming information on the display portion 3 of the upper portion 2 A of the main body cover 2. Then, the medical staff can operate the operation buttons on the operation panel unit 4 while checking the information on the display unit 3 of the upper portion 2A of the main body cover 2. Thereby, in the medical field, the operativity of the infusion pump 1 can be improved.
As shown in FIG. 3, the tube mounting portion 50 includes a bubble sensor 51, an upstream blockage sensor 52, a downstream blockage sensor 53, a tube clamp portion 270, a first infusion tube guide portion 54 at the right side position, and a left side position. A second infusion tube guide portion 55 is provided.

As shown in FIG. 3, an infusion tube setting direction display unit 150 for clearly displaying the T direction that is the correct liquid feeding direction when the infusion tube 200 is set is provided in the vicinity of the tube mounting unit 50. ing. The infusion tube setting direction display unit 150 includes, for example, a plurality of arrows 151. The infusion tube setting direction display unit 150 may be printed directly on the lower part of the tube mounting part 50, for example, or may be printed on a seal-like member and attached to the lower part of the tube mounting part 50. The infusion tube setting direction display unit 150 is arranged to clearly indicate the liquid feeding direction (T direction) in the correct direction of the medicine 171 by the infusion tube 200 set inside the opening / closing cover 5.
Accordingly, when the medical staff opens the opening / closing cover 5 of FIG. 3 in the CS direction, opens the tube mounting portion 50, and mounts the infusion tube 200 on the tube mounting portion 50, the infusion tube 200 It is possible to clearly indicate the T direction, which is the direction of drug delivery. For this reason, it can prevent reliably that a medical worker will attach the infusion tube 200 by the reverse direction accidentally.

Next, a structural example of the opening / closing cover 5 shown in FIG. 3 will be described.
As shown in FIG. 3, the open / close cover 5 is a plate-like member made of a thin molded resin member in order to reduce the weight of the infusion pump 1. Thereby, the weight of the opening / closing cover 5 can be reduced, and the structure can be simplified. The opening / closing cover 5 has two

hinge portions

2H and 2H that allow the tube mounting portion 50 to be covered so as to be openable and closable along the CS direction and the CR direction about the rotation shaft 5A. It is supported with respect to the main body lower part 2B. The two

hinge portions

2H and 2H are arranged corresponding to the first hook member 5D and the second hook member 5E, respectively.

As shown in FIGS. 2 and 3, an opening / closing operation lever 260 is provided at the upper right portion on the surface side of the opening / closing cover 5. On the inner surface side of the opening / closing cover 5, an infusion tube pressing member 500, a first hook member 5D, and a second hook member 5E are provided. The infusion tube pressing member 500 is disposed as a long rectangular and planar protrusion along the X direction, and the infusion tube pressing member 500 is in a position facing the liquid feeding drive unit 60. The infusion tube pressing member 500 has a flat surface in the X direction along the liquid feeding drive unit 60, and the infusion tube pressing member 500 closes the opening / closing cover 5 in the CR direction, A part of the infusion tube 200 is pressed between them.
The medical worker can set the infusion tube 200 on the lower half of the body of the infusion pump 1 along the horizontal direction while confirming the display content displayed on the display unit 3, and the infusion tube 200 is connected to the tube mounting portion. After being set to 50, the opening / closing cover 5 can cover the infusion tube 200.

As shown in FIG. 3, the first hook member 5D and the second hook member 5E are mechanically simultaneously engaged with the fixing

portions

1D and 1E on the lower body 1B side, so that the open / close cover 5 is As shown, the tube mounting part 50 of the main body lower part 1B is held in a closed state. The first hook member 5D, the second hook member 5E, and the fixing

portions

1D, 1E on the main body lower part 1B side constitute a double hook structure portion 300 of the opening / closing cover 5.

The tube clamp part 270 shown in FIG. 3 clamps and closes the middle part of the infusion tube 200 by closing the open / close cover 5. The tube clamp portion 270 is disposed in the vicinity of the left fixed portion 1E and at a position corresponding to the left second hook member 5E. When the medical worker sets the infusion tube 200 horizontally in the X direction and the medical worker closes the opening / closing cover 5 in the CR direction, the tube clamp portion 270 can block a part of the infusion tube 200 in the middle.

As shown in FIG. 3, the first infusion tube guide portion 54 is provided on the right side of the main body lower portion 1B, and the second infusion tube guide portion 55 is provided on the left side of the main body lower portion 1B. Yes. The first infusion tube guide portion 54 can be held by fitting the upstream side 200A of the infusion tube 200, and the second infusion tube guide portion 55 can be held by fitting the downstream side 200B of the infusion tube 200, and the infusion tube 200 can be held. It is held in the horizontal direction along the X direction. Thus, the infusion tube 200 held in the horizontal direction is in the T direction along the bubble sensor 51, the upstream block sensor 52, the liquid feed drive unit 60, the downstream block sensor 53, and the tube clamp unit 270. It is fixed by fitting along.

As shown in FIG. 3, the second infusion tube guide portion 55 is a groove portion formed in the side surface portion 1 S of the main body lower portion 1 B in order to detachably hold a part of the downstream side 200 B of the infusion tube 200. is there. The first infusion tube guide portion 54 and the second infusion tube guide portion 55 are provided in the tube attachment portion 50 so that the infusion tube 200 is not sandwiched between the opening / closing cover 5 and the tube attachment portion 50 and crushed. Can be installed securely.

The bubble sensor 51 shown in FIG. 3 is a sensor that detects bubbles (air) generated in the infusion tube 200. For example, the bubble sensor 51 flows into the infusion tube 200 from the outside of the infusion tube 200 such as soft vinyl chloride. It is an ultrasonic sensor that monitors bubbles contained in a medicine. By applying ultrasonic waves generated from the ultrasonic wave transmitter of the ultrasonic sensor to the drug flowing in the infusion tube 200, the ultrasonic wave transmittance in the drug and the ultrasonic wave transmittance in the bubbles are different. The receiving unit monitors the presence or absence of bubbles by detecting the difference in transmittance. The bubble sensor 51 has a pressing member 320 and a receiving member 330. The ultrasonic oscillator is disposed on the pressing member 320. The ultrasonic wave receiver is disposed on the receiving member 330.

The upstream blockage sensor 52 shown in FIG. 3 is a sensor that detects whether or not the inside of the infusion tube 200 is blocked on the upstream side 200A of the infusion tube 200, and the downstream blockage sensor 53 is an infusion solution on the downstream side 200B of the infusion tube 200. It is a sensor that detects whether or not the inside of the tube 200 is closed. The upstream blockage sensor 52 and the downstream blockage sensor 53 have the same configuration. The case where the infusion tube 200 is blocked is, for example, a case where the viscosity of the medicine to be delivered is high or the concentration of the medicine is high.

3, pressing

members

452 and 453 are provided on the inner surface side of the opening / closing cover 5 at positions corresponding to the upstream closing sensor 52 and the downstream closing sensor 53, respectively. When the medical worker sets the infusion tube 200 in the tube mounting portion 50 as shown in FIG. 3 and then closes the opening and closing cover 5 as shown in FIG. 2, the pressing member 452 and the pressing member 453 on the opening and closing cover 5 side A part of the infusion tube 200 can be pressed against the upstream blockage sensor 52 and the downstream blockage sensor 53 side, respectively. For this reason, even if the infusion tube 200 of any size among the plural types of infusion tubes 200 having different diameters is attached to the infusion pump 1, when the open / close cover 5 is closed, the upstream side occlusion sensor 52 and the downstream side occlusion sensor 53 are The occlusion state of the infusion tube 200 can be detected.

As shown in FIG. 4, the infusion pump 1 has a control unit (computer) 100 that controls the overall operation. The control unit 100 is, for example, a one-chip microcomputer, and includes a ROM (Read Only Memory) 101, a RAM (Random Access Memory) 102, a nonvolatile memory 103, and a clock 104. The clock 104 can correct the current time by a predetermined operation, and can acquire the current time, measure the elapsed time of a predetermined liquid feeding operation, measure the reference time of liquid feeding speed control, and the like. The controller 100 is connected to a temperature sensor 180 such as a thermistor or a C-MOS type semiconductor in order to measure the temperature of the environment where the infusion pump 1 is placed.
The control unit 100 shown in FIG. 4 is connected to a power switch button 4F and a switch 111. The switch 111 supplies power to the control unit 100 from either the power converter unit 112 or the rechargeable battery 113 by switching between the power converter unit 112 and the rechargeable battery 113 such as a lithium ion battery. The power converter unit 112 is connected to an AC power source (commercial AC power source) 115 via an outlet 114.

Returning to FIG. 4, the display unit driver 130 drives the display unit 3 according to a command from the control unit 100 to display the information content and warning message illustrated in FIG. 2. The speaker 131 can notify various alarm contents by voice according to a command from the control unit 100. The buzzer 132 can notify various alarms by sound according to commands from the control unit 100. The speaker 131 is an example of a warning unit that issues a warning by voice to a medical worker when the infusion tube 200 is set in the N direction (reverse direction), which is the wrong direction. The buzzer 132 is an example of a warning unit that issues a warning by sound to a medical worker when the infusion tube 200 is set in the N direction (reverse direction), which is the wrong direction.

In FIG. 4, the bubble detection signal S 1 from the bubble sensor 51, the upstream block signal S 2 indicating that the upstream side of the infusion tube 200 from the upstream block sensor 52 is blocked, and the downstream of the infusion tube 200 from the downstream block sensor 53. A downstream block signal S3 indicating that the side is blocked is supplied to the control unit 100. The upstream blockage sensor 52 and the downstream blockage sensor 53 can detect a state in which the internal pressure of the infusion circuit exceeds the set pressure in the infusion pump 1 and the medicine cannot be delivered. The reason why the internal pressure of the infusion circuit exceeds the set pressure in the infusion pump 1 is that when the infusion needle for infusion or the infusion tube 200 is clogged, the infusion tube 200 is crushed or broken, a highly viscous drug This is the case when using.

In FIG. 4, the control unit 100 includes RS-232C (RS: Recommended Serial Standard; a serial input / output interface of a communication system standardized by EIA (American Electronic Industry Association)), a wired communication system, an infrared communication using a wireless LAN, and the like. Thus, bidirectional communication with a computer 141 such as a desktop computer is possible through the communication port 140. This computer 141 is connected to a drug database (DB) 160, and drug information MF stored in the drug database 160 is acquired by the control unit 100 via the computer 141, and the non-volatile state of the control unit 100 is acquired. It can be stored in the memory 103. The control unit 100 can display the drug information MF and the like on the display unit 3 shown in FIG. 2, for example, based on the stored drug information MF. The drug information MF includes the drug manufacturer name, drug name, upper and lower limit values of the scheduled dose (mL) of drug administration, and upper and lower limit values of the flow rate (mL / h).

In the liquid feeding drive unit 60 shown in FIG. 4, when the drive motor 61 and the output shaft 61A of the drive motor 61 rotate, the eccentric cams 62A to 62F provided on the cam structure 62 supported by the output shaft 61A rotate. Then, the plurality of fingers 63A to 63F are sequentially advanced and retreated in the Y direction by a predetermined stroke (the distance between the top dead center and the bottom dead center). As the drive motor 61, a step motor is used.
The cam structure 62 has a plurality of cams, for example, a plurality of cams 62A to 62F, and the finger structure 63 has a plurality of fingers 63A to 63F corresponding to the plurality of cams 62A to 62F. . The plurality of cams 62A to 62F are arranged with a phase difference from each other, and the cam structure 62 is connected to the output shaft 61A of the drive motor 61.

When the output shaft 61A of the drive motor 61 rotates in response to a command from the control unit 100 shown in FIG. 4, the plurality of fingers 63A to 63F sequentially advance and retreat by a predetermined stroke in the Y direction, so that the infusion tube 200 extends along the T direction. Then, it is pressed against the infusion tube pressing member 500 of the opening / closing cover 5. For this reason, the medicine in infusion tube 200 can be sent in the T direction. That is, when the plurality of fingers 63A to 63F are individually driven, the plurality of fingers 63A to 63F sequentially press the outer peripheral surface of the infusion tube 200 along the T direction to feed the medicine in the infusion tube 200. Do. In this way, the sub-control unit 400 controls the peristaltic motion of the plurality of fingers 63A to 63F, thereby causing the fingers 63A to 63F to move forward and backward in sequence, so that the wave travels, so that the blocking point of the infusion tube 200 is increased. Is moved in the T direction, the infusion tube 200 can be squeezed to feed the drug in the T direction.

Next, with reference to FIG. 5, an example in which the finger structure 63 of the liquid feeding drive unit 60 pushes the infusion tube 200 to feed the medicine 171 in the infusion tube 200 will be described.
5 (A) to 5 (F) show a so-called mid-press type liquid feeding drive unit 60 that pushes the inside of the infusion tube 200 and feeds the medicine 171 by squeezing the infusion tube 200 in the T direction. Show. However, the liquid feeding drive unit 60 feeds the medicine 171 in the infusion tube 200 by pressing the infusion tube 200 without completely crushing it. As described above, the finger structure 63 of the mid-press type liquid delivery drive unit 60 does not completely crush the infusion tube 200, so that a certain amount of the infusion tube 200 is provided within a range in which the infusion tube 200 is less deformed and loose. By squeezing, it is possible to accurately feed the required amount of the medicine 171 to be fed.

5A, the infusion tube 200 is closed by the fingers 63B, and the medicine 171 flows in the T direction into the infusion tube 200. In FIG. 5B, the inflow of the medicine 171 is stopped and the infusion tube 200 is closed by the finger 63F, so that a certain amount of the medicine 171 is placed between the

fingers

63B and 63F in the infusion tube 200. Can be secured.

In FIG. 5C, the finger 63B cancels pushing the infusion tube 200, the finger 63E pushes the infusion tube 200, and in FIG. 5D, the

fingers

63D and 63C push the infusion tube 200. The medicine 171 is discharged in the T direction. In this case, the finger 63E and the

fingers

63D and 63C do not completely crush the infusion tube 200.
In FIG. 5E, the finger 63B pushes the infusion tube 200 again, and stops the discharge of the medicine 171 in the T direction. Then, in FIG. 5 (F), the finger 63B is released from pushing the infusion tube 200, thereby returning to the initial state of FIG. 5 (A). By repeating the procedure for pressing the infusion tube 200 described above as one cycle, the drug 171 can be fed in the T direction. By memorizing the liquid feeding amount (mL) per cycle of the infusion tube 200 to be used, an infusion pump with high liquid feeding accuracy can be obtained.

Reference is now made to FIGS.
FIG. 6 is a flow diagram showing an example of correcting the temperature-dependent accuracy error of the infusion tube 200 applied to the infusion pump 1 according to the embodiment of the present invention. The infusion tube 200 applied to the infusion pump 1 is usually an infusion tube 200 dedicated to the infusion pump 1 whose outer diameter and thickness are defined in order to reduce errors in infusion accuracy. The infusion tube 200 is formed of a thermoplastic resin such as polybutadiene.
FIG. 7 shows an example of the temperature correction value table RT stored in advance in the ROM 101 of the control unit 100 shown in FIG.
First, the temperature correction value table RT in FIG. 7 will be described. This temperature correction value table RT is used by the control unit 100 to refer to every predetermined time interval in order to correct the value of the flow rate of the medicine 171 flowing in the infusion tube 200 according to the level of the environmental temperature. It is a table.

In the temperature correction value table RT shown in FIG. 7, a column 902 of a temperature tag TT [value of 8-bit analog / digital converter (ADC)] and a column 903 of a flow rate correction value BR are shown.
The value of the 8-bit analog / digital converter (ADC) in the column 902 of the temperature tag TT is an ADC value [43-46] when the environmental temperature measured by the temperature sensor 180 is 18 ° C., for example. 43-46] is a value obtained by analog / digital conversion of the environmental temperature detection signal ES, which is an analog signal obtained from the output of the temperature sensor 180, by the analog / digital converter 199 in the control unit 100, as shown in FIG. It is.
As an example of the environmental temperature value, the temperature tag TT [value of 8-bit analog / digital converter (ADC)] is given from 0 to 89 corresponding to the temperature range from −2 ° C. to + 64 ° C. The value of the temperature tag TT corresponding to the temperature range from the ambient temperature 18 ° C. to 42 ° C., and the initial value “100” is set in the range 43 to 70. Therefore, in this range, the temperature change of the infusion tube 200 The flow rate of the drug is not corrected. This is because the flexibility of the infusion tube 200 that is actually used is substantially constant in the temperature range of the ambient temperature of 18 ° C. to 42 ° C.
The settable range of the flow rate correction value BR in the flow rate correction value BR field 903 is, for example, “80 to 120”.

Next, with reference to FIG. 6, an example of the accuracy error correction of the temperature dependence of the infusion tube 200 will be described.
In step ST1 of FIG. 6, the control unit 100 of FIG. 4 instructs the drive motor 61 to operate the drive motor 61, thereby moving the fingers 63F from the fingers 63A of the liquid feeding drive unit 60 as shown in FIG. move. As a result, the liquid supply driving unit 60 starts to supply the medicine 171. At the start of the liquid supply, in step ST2, the infusion pump 1 is arranged in the temperature sensor 180 of FIG. The ambient temperature is measured at a predetermined time interval, for example, every minute. In this case, the temperature sensor 180 outputs and the obtained temperature tag TT temperature tag TT [value of 8-bit analog / digital converter (ADC)] is not converted into an actual environmental temperature value (° C.), but an environmental temperature. It is supposed to be equivalent to

In step ST3, the temperature sensor 180 measures the environmental temperature of the infusion pump 1, and the control unit 100 determines that the temperature tag TT [value of 8-bit analog / digital converter (ADC)] corresponds to the environmental temperature of 18 ° C. or higher. In step ST4, if the control unit 100 determines that the temperature tag TT [value of 8-bit analog / digital converter (ADC)] is equal to or lower than the environmental temperature of 42 ° C., the process proceeds to step ST5.
In step ST5, the control unit 100 in FIG. 4 refers to the temperature correction value table RT stored in the ROM 101, and obtains the temperature tag TT [8-bit analog / digital converter (ADC) value obtained from the temperature sensor 180. ] Corresponds to a temperature range between 18 ° C. and 42 ° C., so that the control unit 100 does not perform temperature correction processing on the drive motor 61. That is, as shown in the column 903 of the flow rate correction value BR in FIG. 7, the flow rate correction value BR is the ADC value “100” which is an initial value. The flow rate is not corrected. That is, the control unit 100 does not increase or decrease the control speed (rotational speed) of the drive motor 61.
In step ST6, when a predetermined amount of the medicine 171 is fed, the liquid feeding process of the medicine 171 is completed. However, if the predetermined amount of medicine 171 has not yet been delivered, the process returns to step ST2 and steps after step ST2 are executed.

On the other hand, the temperature sensor 180 outputs in step ST3, and the obtained temperature tag TT [value of 8-bit analog / digital converter (ADC)] corresponds to the environmental temperature less than 18 ° C., or in step ST4. To correspond to the case where the temperature tag TT [value of 8-bit analog / digital converter (ADC)] obtained from the temperature sensor 180 exceeds the environmental temperature 42 ° C., the process proceeds to step ST7. In step ST7, the control unit 100 in FIG. 4 refers to the temperature correction value table RT stored in the ROM 101, and adopts a value corresponding to the measured environmental temperature value as the flow rate correction value BR. Thereby, the chemical | medical agent flow volume correction | amendment with respect to the temperature change of the infusion tube 200 is performed.

In step ST7, a specific example in the case where the temperature tag TT [value of 8-bit analog / digital converter (ADC)] obtained from the temperature sensor 180 corresponds to an environmental temperature lower than 18 ° C. is illustrated in FIG. Referring to the temperature correction value table RT to be used, for example, if the temperature is 6 ° C., “104” is adopted as the flow rate correction value BR in the flow rate correction value BR field 903. That is, the control unit 100 obtains the ADC value “31-34” of the temperature tag TT from the analog / digital converter 199 in the control unit 100, and the control unit 100 sets the ADC value “31-34” of the temperature tag TT. 34 ”is converted into a corresponding flow rate correction value BR“ 104 ”by referring to the temperature correction value table RT.

The control unit 100 determines the control speed of the drive motor 61 based on the converted flow rate correction value BR “104”, and increases the control speed of the drive motor 61 according to a command from the control unit 100. In this case, since the temperature tag TT [value of 8-bit analog / digital converter (ADC)] obtained from the temperature sensor 180 corresponds to the environmental temperature of 6 ° C., the infusion tube is considerably lower than 18 ° C. The flexibility of 200 is lowered and the rigidity is increased, and the restoring force of the infusion tube 200 is weakened. Therefore, by increasing the control speed of the drive motor 61 according to the command of the control unit 100, it is possible to prevent the amount that can be sent by the liquid feeding operation of the medicine 171 from decreasing and to secure an appropriate amount of medicine 171 to be fed. Can do.
In step ST6, when a predetermined amount of the medicine 171 is fed, the liquid feeding process of the medicine 171 is completed. However, if the predetermined amount of medicine 171 has not yet been delivered, the process returns to step ST2 and steps after step ST2 are executed.

In step ST7, a specific example of a case where the temperature tag TT [value of 8-bit analog / digital converter (ADC)] obtained from the temperature sensor 180 is equivalent to an environmental temperature exceeding 42 ° C. Referring to the temperature correction value table RT illustrated in FIG. 7, for example, if the temperature tag TT [value of 8-bit analog / digital converter (ADC)] obtained from the temperature sensor 180 corresponds to the environmental temperature 51 ° C. “98” is adopted as the flow rate correction value BR in the column 903 of the flow rate correction value BR. That is, the control unit 100 obtains the ADC value “76-81” of the temperature tag TT from the analog / digital converter 199 in the control unit 100, and the control unit 100 sets the ADC value “76-81” of the temperature tag TT. 81 ”is converted to the corresponding flow rate correction value BR“ 98 ”by referring to the temperature correction value table RT.

The control unit 100 determines the control speed of the drive motor 61 based on the converted flow rate correction value BR “98”, and decreases the control speed of the drive motor 61 according to a command from the control unit 100. In this case, since the temperature tag TT [value of 8-bit analog / digital converter (ADC)] obtained from the temperature sensor 180 corresponds to the environmental temperature 51 ° C., the infusion tube 200 is acceptable because it is higher than 42 ° C. The flexibility increases and the rigidity decreases, and the restoring force of the infusion tube 200 is increased. Therefore, by reducing the control speed of the drive motor 61 according to the command of the control unit 100, it is possible to prevent an increase in the amount that can be sent by feeding the medicine 171 and to secure an appropriate amount of medicine 171 to be fed. it can.
In step ST6, when a predetermined amount of the medicine 171 is fed, the liquid feeding process of the medicine 171 is completed. However, if the predetermined amount of medicine 171 has not yet been delivered, the process returns to step ST2 and steps after step ST2 are executed.

In the infusion pump 1 according to the embodiment of the present invention, when the driving motor 61 is operated and the medicine 171 in the infusion tube 200 is fed, due to the influence of heat generated by the driving motor 61 or the circuit board during use, The ambient temperature of the infusion pump 1 may increase steadily. In this case, the rotation speed of the drive motor 61 is corrected according to the change in the environmental temperature by the control unit 100, so that the amount of the medicine 171 delivered by the infusion tube 200 can be ensured with high accuracy.
In addition, when the place where the infusion pump 1 is used is moved from the ward to the operating room, for example, the environmental temperature may drop rapidly. Also in this case, the correction of the rotation speed of the drive motor 61 is performed by the control unit 100 according to the change in the environmental temperature, so that the amount of the medicine 171 delivered by the infusion tube 200 can be ensured with high accuracy.
The infusion pump 1 according to the embodiment of the present invention can prevent a change in the amount of drug delivered to a patient and can administer the drug as prescribed.

By the way, in the temperature correction value table RT shown in FIG. 7, the temperature tag TT [value of 8-bit analog / digital converter (ADC) obtained from the temperature sensor 180; In the range corresponding to ° C., the flow rate correction value is set to the initial value “100”.
However, when the material of the infusion tube 200 is different or the manufacturer of the infusion tube 200 is different, another temperature correction value table is prepared, and the temperature corresponding to the environmental temperature is in the range of 18 ° C. to 42 ° C. Can be set to an initial value of “100” in any different range. Further, the value of each temperature tag in the temperature tag column 902 corresponding to the environmental temperature and the value of the flow rate correction value in the flow rate correction value column 903 can be changed.
In the temperature correction value table RT, a temperature reference converted based on the output of the temperature sensor 180 may be combined with the temperature tag.
The temperature correction value table RT stores the tube outer diameter, the tube inner diameter, the amount of liquid delivered per cycle (mL), etc. for each manufacturer as information on the infusion tube as in the drug library in the storage unit of the computer 141. It is stored as a database, and can be acquired (downloaded) by the control unit 100 through the communication port 140 and stored in the nonvolatile memory 103 of the control unit 100. Based on the stored temperature correction value table RT, the control unit 100 displays / displays, for example, on the display unit 3 shown in FIG. 2 and selects / sets the infusion tube 200 to be used by a key operation using the menu selection button 4E or the like. can do.
In addition, a temperature correction value table RT of a few manufacturers, which are frequently used, is stored in the nonvolatile memory 103 of the control unit 100 and displayed on, for example, the display unit 3 shown in FIG. Can be selected and set by a key operation using the menu selection button 4E or the like.
In addition, an identification tag such as an RFID storing a temperature correction value table RT is provided at an appropriate position of the infusion tube 200, and the information is read by a reading device (not shown) and stored in the nonvolatile memory 103 of the control unit 100. It can be memorized.
By doing so, infusion tubes 200 from various manufacturers can be used, and variations in the accuracy of drug delivery can be reduced.

An infusion pump 1 according to an embodiment of the present invention is an infusion pump for delivering a drug to a patient through an infusion tube. The infusion pump 1 includes a motor that pushes the infusion tube and sends a medicine in the infusion tube, a control unit that controls the motor, and a temperature sensor that detects an environmental temperature of the infusion pump. For each time interval (for example, 1 minute), refer to a flow rate correction value table indicating a flow rate correction value when a drug is allowed to flow through a predetermined infusion tube corresponding to the environmental temperature. The flow rate correction value is converted, and the motor control speed is determined based on the flow rate correction value.
As a result, the control unit 100 refers to the flow rate correction value table RT indicating the flow rate correction value when the drug is allowed to flow through the predetermined infusion tube corresponding to the environmental temperature at each predetermined time interval. Is converted into a flow rate correction value, and the control speed of the motor is determined based on the flow rate correction value. Thereby, when using the infusion pump, the medicine can be accurately delivered corresponding to the change in the environmental temperature by changing and resetting the amount of medicine delivered following the environmental temperature. .

In the range where the temperature tag TT [8-bit analog / digital converter (ADC) value] obtained from the temperature sensor 180 corresponds to the environmental temperature of 18 ° C. to 42 ° C., the control unit 100 sets the reference initial value of the flow rate correction value. By selecting and setting the flow rate correction value when the ambient temperature is lower than 18 ° C. larger than the reference initial value, the motor control speed is increased, and the flow rate correction value when the ambient temperature is higher than 42 ° C. The motor control speed is lowered by setting it smaller than the reference initial value. As a result, the flow rate correction value is determined in advance by dividing into a range corresponding to an environmental temperature of 18 ° C. to 42 ° C. where the flexibility of the infusion tube is substantially constant, a temperature range below 18 ° C., and a temperature range exceeding 42 ° C. Therefore, it is possible to accurately deliver the medicine following the ambient temperature when using the infusion pump.

The flow rate correction value table RT is stored in the memory 101 of the control unit. As a result, the control unit 100 can simply refer to the flow rate correction value table stored in the memory of the control unit without using a separate storage unit for storing the flow rate correction value table. The medicine can be accurately fed following the temperature.

The infusion tube 200 has a liquid feeding drive unit 60 that feeds the medicine in the infusion tube while pressing the infusion tube 200 in the longitudinal direction. The liquid feeding driving unit has a plurality of cams rotated by the operation of the motor, and rotation of the plurality of cams. And a plurality of fingers for feeding the medicine in the infusion tube while pushing the infusion tube in the longitudinal direction by moving the tube separately and pushing the infusion tube. Thus, at a predetermined time interval, the infusion tube is in the state of the infusion tube corresponding to the environmental temperature while the plurality of fingers press the infusion tube by increasing and decreasing the control speed of the motor according to the environmental temperature. It is possible to send an appropriate amount of liquid that is corrected.

A display unit for displaying information and an operation panel unit having operation buttons are arranged on the upper part of the main body of the infusion pump 1, and the lower part of the main body of the infusion pump is an area for arranging an infusion tube. Thereby, the medical worker can perform the liquid feeding operation of the medicine by the infusion pump while confirming the information on the display unit on the upper part of the main body. Then, the medical worker can operate the operation buttons on the operation panel unit while confirming the information on the display unit on the upper part of the main body.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the claims.
In the embodiment of the infusion pump of the present invention, in FIG. 5, the liquid feeding drive unit 60 is a mid for feeding the drug 171 in the infusion tube 200 by pressing the infusion tube 200 without completely crushing it. The press method is illustrated. However, the present invention is not limited to this, and the liquid feeding drive unit 60 may employ a full press system in which the medicine 171 in the infusion tube 200 is fed by completely crushing the infusion tube 200. Further, in the temperature range of 18 ° C. to 42 ° C., the reference initial value “100” of the flow rate correction value is selected, but not limited to this, depending on the material of the infusion tube, the diameter of the infusion tube, etc. The temperature range of the environmental temperature can be changed. Furthermore, the control unit refers to the flow rate correction value table at predetermined time intervals (for example, 1 minute). However, the present invention is not limited to this, and the time interval at which the control unit refers to the flow rate correction value table may be set shorter than one minute or may be set longer than one minute.
A part of each configuration of the above embodiment can be omitted, or can be arbitrarily combined so as to be different from the above.

DESCRIPTION OF SYMBOLS 1 ... Infusion pump, 3 ... Display part, 50 ... Tube mounting part, 60 ... Liquid feeding drive part, 61 ... Drive motor (example of motor), 100 ... Control part, 101 ... ROM, 171 ... drug, 200 ... infusion tube, RT ... temperature correction value table, BT ... temperature guide, TT ... temperature tag, BR ... flow rate correction value

Claims

An infusion pump for delivering a drug to a patient by an infusion tube,
A motor that pushes the infusion tube to feed the drug in the infusion tube;
A control unit for controlling the motor;
A temperature sensor for detecting an environmental temperature of the infusion pump;
The control unit refers to a flow rate correction value table indicating a flow rate correction value at the time of flowing the drug through the infusion tube determined in advance corresponding to the environmental temperature at predetermined time intervals. An infusion pump characterized by converting the environmental temperature obtained from the above into a flow rate correction value and determining a control speed of the motor based on the flow rate correction value.
The control unit selects a reference initial value of the flow rate correction value in the temperature range of 18 ° C. to 42 ° C., and sets the flow rate correction value when the environmental temperature is less than 18 ° C. as the reference initial value. The control speed of the motor is increased by setting a value larger than the value, and the control speed of the motor is decreased by setting the flow rate correction value when the environmental temperature exceeds 42 ° C. to be smaller than the reference initial value. The infusion pump according to claim 1.
The infusion pump according to claim 1, wherein the flow rate correction value table is stored in a memory of the control unit.
A liquid feeding drive unit that feeds the medicine in the infusion tube while pressing the infusion tube in a longitudinal direction, the liquid feeding drive unit including a plurality of cams that are rotated by an operation of the motor; And a plurality of fingers for feeding the medicine in the infusion tube while pushing the infusion tube in the longitudinal direction by moving the tube separately by rotation of the cam. The infusion pump according to any one of claims 1 to 3.
A display unit for displaying information and an operation panel unit having operation buttons are arranged on an upper part of the main body of the infusion pump, and a lower part of the main body of the infusion pump is an area for arranging the infusion tube. The infusion pump according to claim 4.