JP2019069289A - Syringe pump - Google Patents

Abstract

To provide a syringe pump which can stop medicine feeding while preventing medicine from abruptly flowing in a tube when bend or twist of the tube is corrected and a closed state of the tube is canceled, and thereby can improve safety of medicine feeding operation.SOLUTION: A syringe pump 1 has: a drive motor 133; a syringe pusher pressing member 10 which grips a syringe pusher 202 of a syringe 200 and pushes a syringe pusher 202 by positive rotation of the drive motor 133 and feeds medicine in the syringe 200 for a patient P; a pressure sensor 900 which detects pressure when the syringe pusher 202 is pushed in order to detect that a tube 203 is in a closed state; and a control part 100 which performs reverse operation of the drive motor 133 when the pressure detected by the pressure sensor 900 is beyond predetermined closing determination reference value LC and stops the reverse operation of the drive motor 133 when any one of prescribed conditions is reached.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a syringe pump for mounting a syringe and delivering a drug solution in the syringe to a patient.

  Syringe pumps are used, for example, in the intensive care unit (ICU), etc., and highly accurately deliver patients with drugs such as anti-cancer agents, anesthetics, chemotherapeutic agents, blood transfusions, and nutrient solutions. It is used for relatively long time. The flow control of the medical fluid of the syringe pump is more precise and superior than other infusion pumps.

  In a treatment room or operating room using a syringe pump, a plurality of types of syringes having different capacities are prepared in advance. The medical worker selects a syringe of the required capacity from a plurality of types of syringes, and mounts the selected capacity of the syringe on the above-described syringe pump. When the syringe is mounted in the housing portion of the syringe pump, the main body flange of the syringe main body is gripped, and the plunger flange of the syringe pusher is gripped by the slider as the moving member. Thus, when the motor of the syringe pump is driven, the slider pushes the syringe pusher little by little toward the syringe main body side, whereby the syringe pusher can push out the drug solution in the syringe main body and send it to the patient through the tube. (See Patent Document 1).

JP, 2010-88564, A

By the way, when a medical worker turns on the power switch of the syringe pump to operate the motor of the syringe pump, the slider pushes the syringe pusher little by little toward the syringe main body side to push out the drug solution in the syringe main body. Can be delivered to the patient through However, depending on the positional relationship between the syringe pump and the patient, a part of the tube may be bent or twisted to cause a state in which the tube is blocked. When the tube is occluded, the flow of the drug stops, so that the drug can not be safely delivered to the patient.
Therefore, when a medical worker corrects the bending or twisting of the tube, the blockage of the tube is rapidly eliminated, so the drug rapidly flows through the tube from which the blockage has been released and is delivered to the patient. There is a risk of
Therefore, according to the present invention, when the tube is unblocked by eliminating bending or distortion of the tube, the liquid delivery of the drug can be stopped while preventing the drug from flowing rapidly through the tube. It is an object of the present invention to provide a syringe pump capable of enhancing the safety of the liquid transfer operation of

The syringe pump of the present invention is a syringe pump that delivers the drug in the syringe to a patient via a tube by pushing a syringe pusher of a syringe filled with the drug, and the syringe of the syringe A syringe mounting portion for mounting (setting) a main body, a drive motor, a moving member for pushing the syringe pusher by forward operation of the drive motor to transfer the medicine in the syringe to the patient, the tube Pressure sensor for detecting the pressure at which the syringe presser is pushed to detect that the valve is in a closed state, and the drive when the pressure detected by the pressure sensor exceeds a predetermined blockage judgment reference value The blockage relief process is performed by starting the reverse rotation of the motor, and then, when any one of a plurality of predetermined conditions for stopping the reverse rotation is reached, the drive is stopped. And having a control unit for stopping the reverse rotation operation of the motor.
The plurality of predetermined conditions for stopping the reverse rotation are characterized by the following 1) to 4).
1) The occlusion pressure is less than a predetermined level (50 mmHg)
2) The “reverse rotation amount” determined for each of the syringes becomes a predetermined number of steps,
3) The integrated amount is less than the integrated amount at the start of liquid transfer
4) The accumulated amount becomes 0 According to the above configuration, the pressure sensor detects the pressure when pushing the syringe presser in order to detect that the tube is in a closed state, and the control unit The drive motor is reversely operated when the pressure to be detected exceeds a predetermined blockage judgment reference value, and the reverse operation of the drive motor is stopped when the pressure detected by the pressure sensor becomes lower than a predetermined blockage judgment reference value. . As a result, when the tube bends or twists, and the blocked state of the tube is released, the drug delivery can be stopped while preventing the drug from flowing rapidly through the tube, and the drug delivery can be performed. It can enhance the safety of operation.

Preferably, the drive motor is a step motor, and the pressure sensor is mounted on a moving member.
According to the above configuration, by using the step motor as the drive motor, the drive motor can be easily reverse operated from normal rotation, and furthermore, the pressure sensor can directly receive the pressure from the syringe presser. , Easy to detect the closed state of the tube.

Preferably, the control unit maintains excitation of the reverse rotation operation of the drive motor for a certain period of time when stopping the reverse rotation operation of the drive motor.
According to the above configuration, when stopping the reverse rotation operation of the rotor of the drive motor, it is possible to prevent the rotor from rotating in the reverse direction due to the inertia of the rotor, so that the drug in the tube is not sucked uselessly .

Preferably, the apparatus further comprises a notification unit for notifying that the drive motor has been stopped when the drive motor is stopped.
According to the above configuration, the notification unit notifies the stop of the drive motor, so that the medical worker can confirm the stop of the liquid feeding operation of the medicine due to the stop of the drive motor.

Preferably, the notification unit is a speaker that notifies by voice that the drive motor has been stopped.
According to the above configuration, since the speaker notifies the stop of the drive motor by voice, the medical worker can confirm the stop of the liquid feeding operation of the drug due to the stop of the drive motor by voice.

Preferably, the notification unit is a display unit that displays that the drive motor has been stopped.
According to the above configuration, the display unit notifies the stop of the drive motor, so that the medical worker can visually confirm the stop of the liquid feeding operation of the drug due to the stop of the drive motor.

Preferably, the display unit for displaying information and an operation panel unit having an operation button are mounted on the upper part of the main body of the syringe pump, and the lower part of the main body of the syringe pump is the syringe setting part And the moving member is placed.
According to the above configuration, the medical worker can perform the liquid transfer operation of the drug solution from the syringe while confirming the information of the display unit on the upper part of the main body. And a medical worker can operate the operation button of an operation panel part, confirming the information of the display part of the upper part of a main body.

  According to the present invention, when the tube is unblocked by correcting the bending or twisting of the tube, the drug delivery can be stopped while the drug does not rapidly flow through the tube, and the drug delivery can be performed. It is possible to provide a syringe pump that can enhance the safety of liquid operation.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the preferable embodiment of the syringe pump of this invention. The perspective view which looked at the syringe pump shown in FIG. 1 from W direction. The perspective view which shows the example of the syringe of multiple types of magnitude | size. The figure which shows the electric structural example in a syringe pump. FIG. 3 is a perspective view showing a part of the syringe setting unit and the syringe pressing member driving unit shown in FIG. 2; FIG. 6 is an enlarged perspective view of a part of the syringe setting unit and the syringe presser driving unit shown in FIG. 5 from an E direction; FIG. 7 is an exploded perspective view showing a syringe presser driving unit, a boot, and the like. The perspective view which shows the state contracted from the state which extended | stretched the boot most. The figure which shows the structural example of a drive motor. FIG. 10 is a diagram showing an example of a pulse-like input current waveform given to the drive motor shown in FIG. 9; The flowchart which shows the operation example of the drive motor of a syringe pump.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiment described below is a preferable specific example of the present invention, and therefore, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no statement of purport, it is not limited to these modes.
FIG. 1 is a perspective view showing an embodiment of a syringe pump of the present invention. FIG. 2 is a perspective view of the syringe pump shown in FIG. 1 as viewed from the W direction. The syringe pump 1 shown in FIGS. 1 and 2 is used, for example, in an intensive care unit etc., and for patients, for example, microinjection of a drug solution such as an anticancer agent, an anesthetic agent, a chemotherapeutic agent, a blood transfusion etc. It is a micro sustained infusion pump used to perform procedures with high accuracy and relatively long time.

As shown in FIGS. 1 and 2, the syringe pump 1 can be mounted and fixed so as not to move, for example, the syringe body 201 of the syringe 200 filled with a drug solution using the clamp 5. When the drive motor 133 of the syringe presser drive unit 7 shown in FIG. 2 rotates the feed screw 135, the syringe presser pressing member 10 of the syringe presser drive unit 7 operates the syringe presser 202 of the syringe 200. The main body 201 can be pressed in the T direction. As the drive motor 133, for example, preferably a two-phase four-pole type stepping motor (stepping motor) can be used.
As a result, as shown in FIG. 2, the liquid medicine in the syringe body 201 can be accurately sent to the patient P via the tube 203 and the indwelling needle 204. The tube 203 is a line for delivering the medicine 171, and is a tube made of a flexible thermoplastic resin such as soft vinyl chloride. The tube 203 connects the outlet portion 211 at the tip of the syringe body 201 and the indwelling needle 204.

The syringe presser pressing member 10 is an example of a moving member for pressing and moving the syringe presser 202 toward the syringe main body 201 while holding the presser flange 205 of the syringe presser 202, and is also referred to as a slider.
As shown in FIG. 2, the syringe pump 1 has a housing 2 which is integrally molded of a molded resin material having chemical resistance. As shown in FIG. 1, the housing | casing 2 is comprised as a box which has drip-proof performance by joining and assembling the front cover 2F and the rear cover 2R. As a result, as described later, it has a fender-proof and drip-proof treatment structure capable of preventing intrusion into the inside of the syringe pump 1 even if a chemical solution, moisture or the like is applied.

First, each element placed on the housing 2 of the syringe pump 1 will be described.
As shown in FIG. 2, the syringe pump 1 has a housing 2 and a handle 2T. The display unit 3 and the operation panel unit 4 are placed on the upper portion 2A of the housing 2. The syringe setting unit 6 and the syringe presser driving unit 7 are mounted on the lower portion 2B of the housing 2. Thereby, the medical worker can perform the liquid transfer operation of the medical fluid from the syringe 200 while visually confirming the information content displayed in color on the display unit 3 of the upper portion 2A of the housing 2. Then, the medical worker can operate the operation button of the operation panel unit 4 while confirming the information content color-displayed on the display unit 3 of the housing 2.

The display unit 3 shown in FIGS. 1 and 2 is a color liquid crystal display (LCD) capable of color graphic display. The display unit 3 is placed at the upper left position of the upper portion 2A of the housing 2 and above the syringe setting unit 6 and the syringe pusher driving unit 7. The operation panel unit 4 is mounted on the right side of the display unit 3 in the upper portion 2A of the housing 2, and the operation panel unit 4 is configured with an LED or the like as an operation indicator in the illustrated example as an operation button. Lamp 4A (lights on or blinks green for normal operation, lights on or blinks red for abnormal), fast forward switch button 4B, start switch button 4C, stop switch button 4D, menu select button 4E, power switch 4F Etc. are placed.
The upper part 2A of the housing 2 shown in FIG. The lower portion 2 </ b> B of the housing 2 is a portion of the lower half of the housing 2. In the example shown in FIG. 1 and FIG. 2, the syringe setting unit 6 and the syringe presser driving unit 7 are placed side by side along the X direction. The syringe setting unit 6 can select, for example, the necessary amount of syringe 200 from among a plurality of different types of stored syringes, and can be detachably fitted and attached.

  The syringe setting unit 6 shown in FIGS. 1 and 2 has a housing portion 8 for housing the syringe main body 201, a clamp 5, and a main body flange pressing portion 500 for detachably inserting and holding the main body flange 209. There is. The housing portion 8 has a concave syringe body holding portion 8D. A tube fixing portion 9 for detachably sandwiching the flexible tube 203 is formed on the wall portion of the left end portion of the housing portion 8. The tube fixing portion 9 is a groove portion for sandwiching and fixing a part of the tube 203 so as not to move as shown in FIG.

1 and 2, when a medical worker operates clamp 5 to remove syringe 200 from syringe setting unit 6, for example, Y1 direction (front direction) against the force of a spring (not shown). The clamp 5 is separated from the outer peripheral surface of the syringe body 201 by pulling it and turning it 90 degrees in the R1 direction. Thus, the syringe body 201 can be removed from the syringe body holding portion 8D of the storage portion 8 by releasing the fixation by the clamp 5, and the tube 203 can be removed from the inside of the tube fixing portion 9.
Further, when operating the clamp 5 to accommodate and attach the syringe 200 in the storage portion 8 of the syringe setting portion 6, the clamp 5 is pulled in the Y1 direction against the force of a spring (not shown) and 90 in the R2 direction. The syringe main body 201 is accommodated in the syringe main body holding portion 8D of the accommodation portion 8 by turning it back in the Y2 direction by the force of the spring, and the clamp is performed in a state where the tube 203 is fitted in the tube fixing portion 9. 5 can be fixed.

As shown in FIGS. 1 and 2, when the syringe body 201 is housed and mounted in the syringe body holding portion 8D of the housing portion 8, the syringe pusher 202 is mounted in the syringe pusher driving portion 7. . The syringe presser driving unit 7 has a syringe presser pressing member 10. When the drive motor 133 in FIG. 2 is operated by the command from the control unit and the feed screw 135 is rotated, the syringe presser pressing member 10 moves the presser flange 205 of the syringe presser 202 toward the syringe main body 201 in the T direction. Push along little by little. The feed screw 135 is a guide member for pushing the syringe presser pressing member 10 little by little toward the housing portion 8 to guide it.
As a result, the drug solution in the syringe body 201 can be sent to the patient P with high accuracy over a relatively long time through the tube 203 and the indwelling needle 204. 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.

  FIG. 3 is a perspective view showing an example of a plurality of types of syringes described above. In FIG. 1 and FIG. 2, as an example, the syringe 200 having the largest capacity of the drug solution is fixed. The syringe 200 having the largest capacity of the chemical solution shown in FIG. 3A has the syringe main body 201 and the syringe presser 202, the syringe main body 201 has the main body flange 209, and the syringe presser 202 is pressed. A child flange 205 is provided. On the syringe body 201, a scale 210 of a drug solution is formed. One end of a flexible tube 203 is detachably connected to the outlet portion 211 of the syringe body 201.

The syringe 300 shown in FIG. 3B, which has a medium capacity of the drug solution, has a syringe main body 301 and a syringe presser 302, the syringe main body 301 has a main body flange 309, and the syringe presser 302 has A presser flange 305 is provided. A scale 310 of the drug solution is formed on the syringe body 301. One end of a flexible tube 203 is detachably connected to the outlet portion 311 of the syringe body 301.
The syringe 400 having the smallest stored solution amount shown in FIG. 3C has a syringe main body 401 and a syringe presser 402, and the syringe main body 401 has a main body flange 409, and the syringe presser 402 is pressed. A child flange 405 is provided. On the syringe body 401, a scale 410 of a drug solution is formed. One end of a flexible tube 203 is detachably connected to the outlet 411 of the syringe body 401.
The syringe 200 shown in FIG. 3 (A) has, for example, 10 mL of a drug solution, and the syringe 300 shown in FIG. 3 (B) has, for example, 5 mL of the drug solution. In 400, for example, the storage volume of the drug solution is 2.0 mL.

  As shown in FIG. 3, the syringe bodies 201, 301, 401 of the syringes 200, 300, 400 have different sizes (volume, outer diameter, etc.). The respective syringe bodies 301 and 401 of the syringes 300 and 400 can be accommodated and fixed in the syringe body holding portion 8D of the accommodation portion 8 in the same manner as the syringe 200 shown in FIGS. 1 and 2. However, although FIG. 3 illustrates three types of syringes, the present invention is not limited to this, and the capacity of the drug solution that can be accommodated by the syringe may be 2.0 mL to 50 mL, for example, 20 mL, 30 mL, 50 mL, etc. . The capacity of the syringe that can be mounted (set) on the syringe pump 1 can be arbitrarily selected.

Next, with reference to FIG. 4, an example of the electrical configuration of the syringe pump 1 shown in FIG. 1 and FIG. 2 will be described.
In FIG. 4, the syringe 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 has a ROM (read only memory) 101, a RAM (random access memory) 102, a non-volatile 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 an elapsed time of a predetermined liquid transfer operation, measure a reference time of speed control of liquid transfer, and the like.

  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 the power converter unit 112 and the rechargeable battery 113 such as a lithium ion battery. The power supply converter unit 112 is connected to the commercial AC power supply 115 via the outlet 114. In FIG. 4, for example, in the housing portion 8, a pair of detection switches 120 and 121 are placed. The detection switches 120 and 121 preferably detect whether the syringe body 201 of the syringe 200 is properly placed in the storage unit 8 and notify the control unit 100 of the detection switch. That is, the detection switches 120 and 121 are dropout detection sensors of the syringe main body that detect that the syringe main body is not accurately placed in the storage unit 8.

The potentiometer 122 as a clamp sensor shown in FIG. 4 is connected to the clamp 5. The potentiometer 122 is a syringe type discrimination sensor that determines the size of the syringes 200, 300, and 400 shown in FIG. 3 (that is, the difference in outer cylinder outer diameter due to the difference in capacity). The potentiometer 122 detects the amount of movement of the clamp 5 when the clamp 5 moves in the Y2 direction, with the syringe body 201 clamped by the clamp 5. As a result, a detection signal is sent to the control unit 100 to notify whether or not the capacity of the syringe body 201 (301, 401) is clamped by the clamp 5. The control unit 100 obtains the amount of movement of the clamp 5 in the Y direction based on the detection signal from the potentiometer 122, and for example, which one of the syringe bodies 201, 301, 401 of the plurality of volumes shown in FIG. It can be determined whether it has been done.
Note that the syringe bodies 201, 301, 401 have slightly different sizes (volume, outer diameter, length, etc.) and syringe pushers 202, 302, 403, even if the syringes have the same volume, depending on the manufacturer. .
Furthermore, the force pressing the presser flanges 205, 305, 405 is also slightly different in order to deliver the drug.
For this reason, data on the blocking pressure (for each syringe) corresponding to the manufacturer and the size of each syringe is stored in the storage unit.

When driven by the motor driver 134 according to a command from the control unit 100, the drive motor 133 of the syringe presser drive unit 7 shown in FIG. 4 rotates the feed screw 135 to move the syringe presser pressing member 10 in the T direction. . Thereby, the syringe presser pressing member 10 presses the syringe presser 202 in the T direction, and the drug solution in the syringe main body 201 shown in FIG. Send to the
The drive motor 133 uses a two-phase step motor or a three-phase step motor, but the motor drive 134 uses a command CT of the control unit 100 to input a forward current input waveform SCW or a reverse input described later. The current waveform SCCC is supplied to the drive motor 133.

In FIG. 4, the display unit driver 130 drives the display unit 3 according to an instruction of the control unit 100 to display various information, notification contents, and the like. The speaker 131 announces various notification contents by voice according to an instruction of the control unit 100. The control unit 100 can bidirectionally communicate with an external computer 141 such as a desktop computer through the communication port 140. The external computer 141 is connected to the chemical solution database (DB) 150, and the chemical solution information MF stored in the chemical solution database 150 is acquired by the control unit 100 via the external computer 141 and the control unit 100 It can be stored in the non-volatile memory 103. The control unit 100 can display the drug solution information MF and the like on the display unit 3 based on the stored drug solution information MF.
The drug information MF includes, for example, drug manufacturer name, drug name, upper limit and lower limit of planned dose (mL) of drug administration, upper limit and lower limit of flow rate (mL / h), contraindication information, and the like.

  In FIG. 4, the fast-forwarding switch button 4B, the start switch button 4C, the stop switch button 4D, the menu selection button 4E, and the power switch 4F are electrically connected to the control unit 100. In addition to this, the control unit 100 is electrically connected to a photocoupler sensor 250 as a detector for detecting that the main body flange 209 is gripped by the main body flange pressing portion 500 (see FIG. 5). It is done. The photocoupler sensor 250 includes a light emitting element 251 and a light receiving element 252 that receives light from the light emitting element 251.

As shown in FIG. 4, a pressure sensor 900 is provided on the syringe pressing member pressing member 10. For example, a strain sensor or the like can be employed as this pressure sensor 900. When the syringe presser pressing member 10 holds the presser flange 205 of the syringe presser 202 of the syringe 200 and presses the syringe presser 202 in the T direction, the pressure sensor 900 is received from the presser flange 205 Changes in pressure can be detected. As a result, there is a problem in the positional relationship between the syringe pump 1 and the patient P in FIG. 2, and it is detected that the part of the tube 203 shown in FIG. 2 is in the closed state by bending or twisting. It has become.
The pressure sensor 900 need not necessarily be provided on the syringe presser pressing member 10.

If there is no problem in the positional relationship between the syringe pump 1 and the patient P in FIG. 2 and a part of the tube 203 is not bent or twisted, the inside of the tube 203 will not be clogged. Therefore, when the syringe presser pressing member 10 presses the syringe presser 202 in the T direction, the syringe presser 202 moves smoothly in the T direction. As a result, the pressure sensor 900 is lightly pressed by the presser flange 205 The pressure measurement signal PS output by the pressure sensor 900 shown in FIG. 4 is less than or equal to a predetermined occlusion pressure determination reference value LC.
On the other hand, for example, depending on the positional relationship between the syringe pump 1 and the patient P in FIG. 2, a part of the tube 203 may be bent or twisted to occlude the tube 203. When the tube 203 is in an occluded state, the drug 171 can not be delivered to the patient P. Therefore, when the syringe presser pressing member 10 presses the syringe presser 202 in the T direction, the syringe presser 202 is difficult to move in the T direction, and as a result, the pressure sensor 900 is strongly pressed by the presser flange 205 As a result, the pressure measurement signal PS output from the pressure sensor 900 shown in FIG. 4 exceeds the predetermined occlusion pressure determination reference value LC.

Next, the detailed structure of the syringe setting unit 6 will be described with reference to FIGS. 5 and 6.
FIG. 5 is a perspective view showing a part of the syringe setting unit 6 and the syringe presser driving unit 7 shown in FIG. FIG. 6 is a perspective view showing a part of the syringe setting unit 6 and the syringe presser driving unit 7 shown in FIG.
The syringe setting unit 6 shown in FIG. 5 includes a storage unit 8 for storing the syringe main body 201, a clamp 5, a main body flange pressing portion 500 for holding the main body flange 209 (see FIG. 3) of the syringe 200 and holding the main body A flange detection unit 600 is provided.

  As shown in FIGS. 1 and 2, as an example, the syringe body 201 of the syringe 200 is set in the syringe setting unit 6, and the syringe body 201 of the syringe 200 is fixed using the clamp 5. As shown in FIGS. 5 and 6, the accommodation portion 8 of the syringe setting portion 6 is a recess capable of accommodating the syringe main body 201, and the axial direction of the accommodation portion 8 is along the X direction. A part of the outer peripheral surface of the syringe main body 201 is in close contact with the inner surface of the syringe main body holding part 8D of the housing portion 8, and the remaining part of the outer peripheral surface of the syringe main body 201 is exposed to the outside. The main body flange detection unit 600 has a photocoupler sensor 250 shown in FIG.

The shape of the main body flange pressing portion 500 will be described with reference to FIGS. 5 and 6. The shape of the main body flange pressing portion 500 is merely an example, and the main body flange pressing portion 500 is not limited to this shape. The main body flange pressing portion 500 is placed along the surface formed in the Y direction and the Z direction.
As shown in FIGS. 5 and 6, the main body flange pressing portion 500 has a distal end portion 501 and two connecting portions 588. The tip portion 501 preferably has two introduction portions 502 and 503 and a recess 504 formed between the introduction portions 502 and 503.

  As a result, as shown in FIGS. 1 and 2, the medical worker uses the main body flange 209 of the syringe 200 and the two introduction portions 502 and 503 shown in FIG. It can be easily inserted along the Y2 direction of FIG. 2 between the right side surface portion 8V of the main body holding portion 8D. Therefore, the main body flange pressing portion 500 can securely fix the main body flange 209. As shown in FIGS. 5 and 6, a substantially circular hole 599 is provided between the connecting portions 588 on both sides. This hole 599 is formed to pass a boot 800 as a covering member described later, as shown in FIG. Thus, when the syringe pusher 202 shown in FIG. 2 is pushed toward the syringe main body 201 to feed the drug solution in the syringe main body 201, the boot 800 is elastically deformed without coming into contact with the main body flange pressing portion 500. It can contract.

  Returning to FIG. 6, in a state where the syringe pump 1 is used, the introduction portion 502 is positioned on the upper side in the Z direction, and the introduction portion 503 is positioned on the lower side. As shown in FIG. 6, a smaller recess 505 is preferably formed at the center of the recess 504. The small recessed portion 505 is a groove portion for inserting a part of the blade portion of the syringe presser 202 shown in FIG. 2 in a state where the syringe 200 is mounted. As a result, the blade portion of the syringe presser 202 does not ride on the surface of the recess 504 of the main body flange pressing portion 500. For this reason, the syringe 200 can be reliably fixed at a predetermined position. This applies not only to the syringe 200 but also to the syringes 300 and 400 shown in FIG.

FIG. 7 is an exploded perspective view showing the front cover 2F, the syringe presser driving unit 7, the main body flange pressing unit 500, the syringe presser pressing member 10, and the cover member 2V as viewed from the rear side. FIG. 7 shows the inner surface side of the front cover 2F, and the front cover 2F has a main body accommodation portion 2M and an extension portion 2N which is formed to extend laterally from the main body accommodation portion 2M. The syringe pusher driving unit 7, the main body flange pressing portion 500, and the boot 800 are accommodated in the main body accommodation portion 2M and the extension portion 2N. The cover member 2V is fixed to the extension 2N by a screw.
The syringe presser drive unit 7 shown in FIG. 7 has a drive unit main body 700, a syringe presser pressing member 10, and a pressing operation unit 701 connected to the syringe presser pressing member 10. The drive portion main body 700 is housed in the lower portion in the main body housing portion 2M of the front cover 2F, and the pressing operation portion 701 and the syringe presser pressing member 10 are housed in the extension portion 2N.

Next, an example of the shape of the boot 800 as a covering member shown in FIGS. 5 and 6 will be described.
The boot 800 is a member that can be elastically deformed and contracted when the syringe presser 202 shown in FIG. 2 is pushed toward the syringe main body 201 and the medical solution in the syringe main body 201 is sent. As shown in FIG. 5, the boot 800 is placed between the right side surface 8 V of the syringe main body holding portion 8 D of the housing portion 8 and the main body 80 of the syringe pressing member pressing member 10. The boot 800 is made of, for example, rubber or plastic that can expand and contract by elastic deformation, and can expand and contract as the syringe pressing member pressing member 10 moves in the X1 direction and the X2 direction.
The boot 800 has a fender-proof structure to cover mechanical elements such as the feed screw 135 shown in FIG. Thereby, for example, even if the liquid medicine in the syringe main body 201 is spilled, the dripping liquid placed on the upper side is dropped, or even if the antiseptic liquid used in the periphery or the water is scattered, the mechanical element such as the feed screw 135 is To prevent adhesion.

FIG. 8 is a front view with a partial cross section showing an example of the shape of the boot 800. As shown in FIG. As illustrated in FIG. 8, the boot 800 has, for example, a plurality of first convex portions 811, 812, 813, 814, 815, 816 of the same size, and a plurality of second convex portions 821, 822, of the same size. 823 and left and right connecting portions 830 and 831. The diameters of the second convex portions 821, 822 and 823 are smaller than the diameters of the first convex portions 811, 812, 813, 814, 815 and 816.
As shown in FIG. 6, the left connecting portion 830 is fixed to the right side surface 8V of the syringe main body holding portion 8D through the hole 599 of the main body flange grip portion 500.

As shown in FIG. 8, two adjacent first convex portions 811 and 812 are continuously formed on the left connecting portion 830, and one second convex portion 821 is continuous to the first convex portion 812. It is formed. Two adjacent first convex portions 813 and 814 are continuously formed on the one second convex portion 821, and one second convex portion 822 is continuously formed on the first convex portion 814. ing. Furthermore, two adjacent first convex portions 815 and 816 are continuously formed in one second convex portion 822 and one second convex portion 823 is continuously formed in the first convex portion 816. ing. One second convex portion 823 is connected to the inner side surface 89 side of the main body 80 via the right connection portion 831.
Thereby, when the syringe presser pressing member 10 moves to the left side and the boot 800 is elastically deformed and contracted, the second convex portions 821, 822, 823 enter the first convex portion having a larger diameter. It is supposed to be.

Next, with reference to FIG. 8, an example of the structure of the syringe presser drive unit 7 shown in FIG. 2 will be described. FIG. 8A shows a state in which the boot 800 is most extended, and FIG. 8B shows a state in which the presser flange 205 is to be fixed to the syringe presser pressing member 10.
As shown in FIGS. 2 and 8, the syringe pusher drive unit 7 is housed and held in the extension 2N of the main body cover 2. The extension 2N is formed by extending in the X1 direction from the lower portion of the main body cover 2. As shown in FIG. 2, the extension 2N includes an upper side surface 701, a lower side surface 702, and a right side surface 703. The extension portion 2N is a space SP surrounded by the upper side surface 701, the lower side surface portion 702, the right side surface portion 703, and the right side surface 8V of the syringe main body holding portion 8D of the housing 8 described above. The syringe presser driving unit 7 is accommodated in the space SP.

As shown in FIG. 2, the syringe presser pressing member 10 of the syringe presser drive unit 7 applies the presser flange 205 of the syringe presser 202 to the syringe main body 201 according to a command from the control unit 100 of FIG. 4. Relatively press along the T direction (X2 direction) little by little. The feed screw 135 is an example of a guide member for guiding the syringe presser pressing member 10 in the T (X2) direction.
When driven by the command of the control unit 100, the drive motor 133 of the syringe presser drive unit 7 shown in FIG. 4 rotates the feed screw 135 to move the syringe presser pressing member 10 in the T direction. Thereby, the syringe pressing member pressing member 10 presses the syringe pressing member 202 in the T direction, and the medicine in the syringe main body 201 shown in FIG. Can be sent to the

As shown in FIG. 8, the syringe presser pressing member 10 has a plastic main body 80, two gripping members 81 and 82, and an operation lever 83. The main body 80 is movable along the guide rails 84 of the extension 2N along the X1 direction and the X2 direction (T direction). The two gripping members 81 and 82 grip the vicinity of the presser flange 205 of the syringe presser 202 shown in FIG. 2 so that the presser flange 205 does not come off the syringe presser pressing member 10. The medical worker pushes down the operating lever 83 in the direction P1 from the initial position shown in FIG. 8A with a finger against the biasing force of the spring or the PR direction as shown in FIG. 8B. Can be lifted by the biasing force of the spring to return to the initial position.
The pressure sensor 900 is mounted on the main body 80, as indicated by a broken line, and is located between the two gripping members 81 and 82. Thus, with the two gripping members 81 and 82 gripping the vicinity of the presser flange 205 shown in FIG. 2, the pressure sensor 900 receives pressure directly from the presser flange 205 shown in FIG. be able to.

Next, with reference to FIGS. 9 and 10, an example of the drive motor 133 shown in FIG. 4 will be described.
FIG. 9 shows a structural example of the drive motor 133, and FIG. 10 shows pulse-shaped input current waveforms SCW and SCCW given to the drive motor 133 shown in FIG.
The drive motor 133 shown in FIG. 9 is, for example, a two-phase four-pole step motor, and includes a magnet rotor 180 and a stator 181 of an electromagnet. The magnet rotor 180 is a permanent magnet having an N pole and an S pole, and is rotatable in the stator 181. The magnet rotor 180 is fixed to the output shaft 133K. The stator 181 has, for example, four excitation coils mounted at every 90 degrees in the clockwise direction, that is, coils 181A, 181B, 181C, and 181D. Coil 181A is an X terminal, coil 181B is a Y terminal, coil 181C is an X bar terminal, and coil 181D is a Y bar terminal.

  The coils 181A, 181B, 181C, and 181D of the drive motor 133 shown in FIG. 9 from the motor driver 134 according to the command CT of the control unit 100 shown in FIG. When a pulse-like input current waveform SCW is applied, as shown in FIGS. 9A to 9D, the magnet rotor 180 rotates in the forward rotation direction CW. That is, as shown in FIG. 9A, the input current waveform SCW is supplied to the coil 181A and the coil 181B as shown in FIG. 9B from the state where the input current waveform SCW is supplied to the coil 181A and the coil 181D. In this state, the magnet rotor 180 performs forward rotation in the normal direction CW by 90 degrees.

Then, as shown in FIG. 9B, the input current waveform SCW is supplied to the coil 181B and the coil 181C as shown in FIG. 9C from the state where the input current waveform is supplied to the coil 181A and the coil 181B. In this state, the magnet rotor 180 further performs normal rotation in the normal direction CW by 90 degrees. Furthermore, as shown in FIG. 9C, the input current waveform SCW is supplied to the coils 181C and 181D as shown in FIG. 9D from the state where the input current waveform SCW is supplied to the coil 181B and the coil 181C. In this state, the magnet rotor 180 rotates forward in the normal direction CW by 90 degrees. Thus, the magnet rotor 180 can be continuously rotated in the forward rotation direction CW with respect to the stator 181.
Further, for the coils 181A, 181B, 181C, and 181D of the drive motor 133 shown in FIG. 9, according to the command CT of the control section 100 shown in FIG. As shown in FIG. 9 (D) to FIG. 9 (A), the magnet rotor 180 rotates in the reverse direction CCW when a pulse-like input current waveform SCWW of excitation is applied.

  As described above, the magnet rotor 180 rotates forward by every 90 degrees or only when the drive motor 133 applies the pulse-like input current waveforms SCW and SCWW from the motor driver 134 according to the command CT of the control unit 100 shown in FIG. The control unit 100 can control the rotational speed and the rotational direction of the magnet rotor 180. As shown in FIGS. 9A to 9D, the magnet rotor 180 is stable at an intermediate position between the two poles of the stator 181, and when the magnet rotor 180 rotates, the stator on the opposite side to the rotational direction Since the magnetism is repelled by reversing the polarity, the magnet rotor 180 can be rotated forward or backward. And since the drive motor 133 is a step motor, the angle of the rotation direction of the magnet rotor 180 can be controlled correctly. In the stationary state, since the magnet rotor 180 is fixed by magnetism, the stationary force of the magnet rotor 180 is large, which is suitable for stopping at a certain angle.

Next, a usage example of the syringe pump 1 according to the embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a flow chart showing an operation example of the drive motor 113 of the syringe pump 1.
In step ST1 shown in FIG. 11, a medical worker selects, for example, the syringe 200 containing a medicine from among the syringes 200, 300, and 400 containing a plurality of medicines shown in FIG. As shown in FIGS. 1 and 2, the syringe 200 is attached to the syringe pump 1. In the medical worker, as shown in FIG. 2, the syringe main body 201 is housed in the syringe main body holding portion 8 D of the housing portion 8 and fixed by the clamp 5 in a state where the tube 203 is fitted in the tube fixing portion 9. Do. The syringe main body 201 can be fixed in the syringe main body holding portion 8D of the housing portion 8. Moreover, a portion of the main body flange 209 is gripped by the main body flange pressing portion 500.

As shown in FIG. 8 (A), the medical worker holds the operation lever 83 in the P1 direction with his finger, and as shown in FIG. 8 (B), the syringe pressing member pressing member 10 is T (X2). Direction) Press in the direction. As a result, as shown in FIG. 2, the main body 80 of the syringe presser pressing member 10 approaches the presser flange 205, and the two gripping members 81 and 82 of the syringe presser pressing member 10 shown in FIG. The presser flange 205 of the presser 202 is gripped.
When the syringe main body 201 is fixed in the syringe main body holding portion 8D of the storage portion 8, a syringe identification signal CR indicating that the potentiometer 122 shown in FIG. 4 detects the syringe main body 201 of the syringe 200 is sent to the control portion 100. Since the feeding is performed, the control unit 100 determines that the syringe main body 201 is attached from among the plurality of types of syringe main bodies 201, 301, and 401 shown in FIG. 3, for example. Moreover, since the pressure sensor 900 is pushed by the presser flange 205 of the syringe 200, the pressure sensor 900 sends a pressure measurement signal PS to the control unit 100.

The drive motor 133 of the syringe presser drive unit 7 shown in FIG. 4 receives a pulse-shaped input current waveform SCW of two-phase excitation for forward rotation shown in FIG. When applied, as shown in FIGS. 9A to 9D, the magnet rotor 180 and the output shaft 133K of the output shaft 113K drive motor 133 in FIG. 9 rotate continuously in the forward rotation direction CW.
The output shaft 133K of the magnet rotor 180 shown in FIG. 9A and the feed screw 135 shown in FIG. 4 are connected by a gear device (not shown). Therefore, as the feed screw 135 shown in FIG. 4 rotates with the rotation of the output shaft 133 K, the feed screw 135 can move the syringe presser pressing member 10 little by little in the T direction. As a result, the syringe presser 202 can accurately send the drug solution in the syringe main body 201 shown in FIG. 2 to the patient P through the tube 203 through the indwelling needle 204.

Next, in step ST2 shown in FIG. 11, the pressure sensor 900 is pushed by the presser flange 205 of the syringe 200 while the medicine in the syringe body 201 is being delivered to the patient P as described above. The controller 100 receives the pressure measurement signal PS from the pressure sensor 900 at predetermined time intervals, for example, every 50 milliseconds.
In step ST3, the control unit 100 determines whether the pressure measurement signal PS sent is less than or equal to a predetermined occlusion determination reference value LC of the tube 203 or exceeds the occlusion determination reference value LC. The blockage determination reference value LC assumes, for example, a case where the tube 203 is blocked due to bending or twisting of a part of the tube 203 depending on the positional relationship between the syringe pump 1 and the patient P. Such a state can be obtained by measuring in advance.
As a value of the predetermined occlusion judgment reference value LC for the tube 203, for example, the occlusion pressure is 300 mmHg (but, according to the use environment, "L": 200 mmHg, "MH": 300 mmHg, "H" It may be set or selected from three stages of 500 mmHg, or may be arbitrarily set between 200 and 300 mmHg. In this case, the control unit 100 takes the pressure value of the moving average of the plurality of pressure measurement signals PS and uses it as the blockage value of the tube 203. The control unit 100 compares the obtained occlusion value with the occlusion pressure determination reference value LC. The control unit 100 can take, for example, a moving average of 20 pressure measurement signals PS, and use the moving average value of the pressure measurement signals PS as the blockage value of the tube 203. Thereby, the occlusion value of the tube 203 can avoid noise.

Depending on the positional relationship between the syringe pump 1 and the patient P, for example, when the obtained occlusion pressure exceeds a predetermined occlusion judgment reference value LC, for example, the occlusion pressure, a part of the tube 203 is bent or twisted. Or the tube 203 is closed. Note that the blocking pressure determination reference value LC is a value including the sliding resistance when sliding the syringe presser pressing member 10 in the T direction.
In addition, the value of the amount capable of suctioning the drug in the tube 203 by the blockage relaxation process by rotating the drive motor 133 in reverse is selected by the control unit 100 according to the size of the syringe set in the syringe pump 1. Can.
The control unit 100 of FIG. 4 has a table of integrated amounts of medicines to be suctioned of different values according to the plurality of types of syringes 200, 300, and 400 illustrated in FIG. 3 and their manufacturers. The control unit 100 can determine which volume of the syringes of the plurality of types of syringe bodies 201, 301, 401 shown in FIG. 3 is mounted by the syringe identification signal CR from the potentiometer 122, for example, and selects the menu Since the manufacturer can be selected with the button 4E, the control unit 100 selects, from the table of integrated amounts of medicines, the integrated amounts of medicines to be aspirated corresponding to, for example, the largest syringe body 201 determined in this example. be able to.
The manufacturer may be stored in the RFID provided on the presser flanges 205, 305, and 405, and may be read automatically by the reader.

If the blockage value of the pressure measurement signal PS is smaller than the predetermined blockage determination reference value LC of the tube 203 in step ST3 in step ST3, the process returns to step ST2, but the pressure measurement signal PS is in the tube in step ST3. If the predetermined occlusion judgment reference value LC of 203 is exceeded, the control unit 100 bends or twists a part of the tube 203 in FIG. 2 depending on the positional relationship between the syringe pump 1 and the patient P. It is determined that a part of 203 is in the closed state, and the process proceeds to step ST4.
Therefore, in step ST4, driving is stopped by stopping application of the pulse-shaped input current waveform SCW of two-phase excitation for forward rotation shown in FIG. 10A from the motor driver 134 according to the command CT of the control unit 100. The forward rotation of the magnet rotor 180 of the motor 133 is stopped.
When the normal rotation of the magnet rotor 180 of the drive motor 133 is stopped in step ST4, the control unit 100 in FIG. 4 gives an instruction to the display unit driver 130 in step ST5 at this time, as needed. In 3, while alerting that "the drive motor has stopped" is displayed, the display screen of the display unit 3 is alerted to the medical worker, for example, by changing from "yellow background" to "white background". . Further, the control unit 100 uses a speaker 131 to notify by voice that "the drive motor has stopped".

  At step ST5, depending on the positional relationship between the syringe pump 1 and the patient P, a part of the tube 203 is bent or twisted to occlude the tube 203, so the control unit 100 of FIG. The magnet rotor 180 of the drive motor 133 is rotated in the reverse direction CCW. The reason for reversely rotating the drive motor 133 in this way is as follows. That is, the medical worker notices that a part of the tube 203 is bent or twisted by the warning display by the display unit 3 or the notification by voice, and the part of the tube 203 is bent or twisted. When the part is corrected and the blockage of the tube 203 is eliminated, the blockage in the tube 203 may be released at a stretch, and the drug may be rapidly delivered to the patient P in the tube 203.

  Therefore, in order to prevent the drug from being rapidly sent to the patient P side, the control unit 100 of FIG. 4 rotates the magnet rotor 180 of the drive motor 133 of FIG. 9 in the reverse direction CCW. . When the magnet rotor 180 is reversely rotated, the magnet rotor 180 reversely rotates at, for example, 2000 pps, and thus the pressure in the tube 203 is lowered. As a result, even if the medical worker restores the state in which a part of the tube 203 is bent or twisted and removes the blockage state of the tube 203, the drug is sent to the patient P at a stretch. There is no way to do it. For this reason, it is possible to take measures against rapid bolus injection (infusion of drug in a short time) when the closed state of the tube 203 is released.

In step ST7 of FIG. 11, it is determined by the determination unit 100 whether or not a predetermined condition for stopping reverse rotation for the alleviation process of occlusion has been reached.
As a plurality of predetermined conditions for stopping reverse rotation, 1) occlusion pressure is below predetermined (50 mmHg), 2) "reverse rotation amount" determined for each syringe reaches a predetermined number of steps, 3) integration amount is Below the integrated amount at the start of liquid transfer, 4) The integrated amount is 0, etc.
Here, the integrated amount means that after a completely new syringe 200, 300, 400 containing a predetermined medicine is placed on the syringe mounting portion of the syringe pump 1, the liquid delivery is started to be delivered to the patient. Flow rate for all
The amount of reverse rotation in which the magnet rotor 180 of the drive motor 133 of FIG. 9 rotates in the reverse direction CCW changes depending on the size of the attached syringe. This is because, for example, the control unit 100 grasps the mounting of the syringe main body 201 as described above, so that the control unit 100 of FIG. 4 is a motor driver according to the size of the syringe main body 201 shown in FIG. By instructing the magnet rotor 180 of the drive motor 133 in the reverse rotation direction CCW in the reverse rotation direction with respect to 134, the pressure in the tube 203 is reduced according to the size of the syringe body 201. However, when the pressure in the tube 203 is reduced, the pressure generated by the blockade of the tube 203 is merely eliminated, so that the pressure in the tube 203 does not become negative. That is, when the magnet rotor 180 is reversely rotated, the magnet rotor 180 is reversely rotated by the number of steps for the “reverse rotation amount” determined for each predetermined syringe.
If the pressure in the tube 203 becomes negative, for example, blood or the like of the patient P may be aspirated toward the syringe main body 201 through the tube 203, the pressure in the tube 203 does not become negative. In order to adjust the pressure, the controller 100 needs to set the reverse rotation amount of the magnet rotor 180 in the reverse direction CCW.

  In step ST8 of FIG. 11, when any of the predetermined stop conditions of the reverse rotation according to the size of the syringe body 201 of the syringe 200 is reached, the reverse rotation of the magnet rotor 180 of the drive motor 133 is stopped. At the time of this stop, the motor driver 134 of FIG. 4 maintains the application of the input current waveform SCCW for reverse rotation to the drive motor 133 for a certain period of time. That is, when the control unit 100 gives the command CT to the motor driver 134 and stops the reverse operation of the drive motor 133, the control unit 100 maintains excitation of the reverse operation for the drive motor 133 for a certain period of time. Stop the reverse operation.

For example, assuming that the state (2) in FIG. 9B is the stop state of the reverse rotation operation, the control unit 100 gives the command CT to the motor driver 134 to apply the input current waveform in this state (2). After the (excitation state) is maintained for a fixed time, the application of the input current waveform SCCW is stopped. The predetermined time is, for example, a period in which the magnet rotor 180 does not further rotate in the reverse direction CCW due to inertia, preferably in a period of about 10 ms to 100 ms. This prevents the magnet rotor 180 from rotating in the reverse direction CCW due to inertia, and prevents the closing pressure in the tube 203 from further decreasing.
Thus, when the reverse operation of the drive motor 133 is stopped in step ST7, as shown in step ST5, the control unit 100 in FIG. 4 gives a command to the display unit driver 130, and The display screen of the display unit 3 warns the medical worker by changing, for example, the “yellow background” to the “white background”, as a warning display is displayed. Further, the control unit 100 uses a speaker 131 and a lamp 4A which lights up or blinks in red to notify by voice that "the driving motor has stopped".

If the photocoupler sensor 250 of FIG. 4 detects that the main body flange 209 of the syringe 200 shown in FIG. 2 is released from being held by the main body flange pressing portion 500 for some reason, the control portion Since 100 receives the main body flange detachment signal GK from the photo coupler sensor 250, in this case, the control unit 100 stops the reverse rotation of the magnet rotor 180 of the drive motor 133 and turns the speaker 131 which is a notification unit into red. An alarm is issued using the lamp 4A that lights up or blinks and the display unit 3. This makes it possible to stop the pressure in the tube 203 from being lowered even though the syringe 200 is not completely attached to the syringe pump.
Also, if the presser flange 205 is detached from the two holding members 81 and 82 of the syringe presser pressing member 10 shown in FIG. 8 for some reason, the presser flange 205 is no longer a pressure sensor 900. The pressure measurement signal PS of the pressure sensor 900 disappears because it is not in contact. Also in this case, the control unit 100 stops the reverse rotation of the magnet rotor 180 of the drive motor 133, and issues an alarm using the speaker 131 which is the notification unit, the lamp 4A which lights up or flashes in red, and the display unit 3. .
Also in these cases, as shown in step ST5, the control unit 100 in FIG. 4 gives a command to the display unit driver 130, and displays a warning on the display unit 3 that "the drive motor has stopped". The display screen of the display unit 3 alerts the medical staff, for example, by changing the "yellow background" to the "white background". In addition, the control unit 100 uses a speaker 131 or a lamp 4A that lights up or flashes in red to notify by voice that "the drive motor has stopped".

The syringe pump 1 according to the embodiment of the present invention is a syringe pump for delivering a drug in a syringe to a patient via a tube by pushing a syringe presser of a syringe filled with the drug. A syringe setting unit for setting the syringe body, a drive motor, and a moving member for pressing a syringe pusher by forward operation of the drive motor to send the medicine in the syringe to the patient and detecting that the tube is blocked Pressure sensor for detecting the pressure when pushing the syringe presser, and the drive motor is reversely operated when the pressure detected by the pressure sensor exceeds a predetermined occlusion judgment reference value, and the pressure detected by the pressure sensor is And a controller configured to stop the reverse rotation operation of the drive motor when the predetermined occlusion determination reference value is exceeded.
Thereby, the pressure sensor detects the pressure when pushing the syringe presser in order to detect that the tube is in the closed state, and the control unit detects the pressure detected by the pressure sensor as a predetermined blockage judgment reference value. When the pressure detected by the pressure sensor falls below a predetermined blockage judgment reference value, the reverse operation of the drive motor is stopped.
That is, when the pressure detected by the pressure sensor exceeds a predetermined occlusion determination reference value, it is considered that occlusion is caused due to bending or twisting of the tube, so if the chemical solution is sent as it is, a large amount of The drug solution may stagnate at a predetermined location. Therefore, the drive motor is reversed to avoid such a situation. When the pressure detected by the pressure sensor becomes equal to or less than a predetermined occlusion determination reference value, it can be assumed that bending or twisting of the tube has been eliminated. The stagnation state can be eliminated.
As a result, when the tube bends or twists, and the blocked state of the tube is released, the drug delivery can be stopped while preventing the drug from flowing rapidly through the tube, and the drug delivery can be performed. It can enhance the safety of operation.

The drive motor is a step motor, and the pressure sensor is mounted on the moving member. By using the step motor as the drive motor, the drive motor can be easily reverse operated from normal rotation, and pressure Since the sensor can directly receive the pressure from the syringe press, it is easy to detect the blockage of the tube.
When stopping the reverse operation of the drive motor, the control unit maintains excitation of the drive motor for a certain period of time, so when stopping the reverse operation of the rotor of the drive motor, the inertia of the rotor causes further reverse rotation of the rotor The drug in the tube can be prevented from being unnecessarily aspirated.

Since the notification unit notifies that the drive motor is stopped because the notification unit notifies that the drive motor is stopped when the drive motor is stopped, the medical worker sends the medicine by stopping the drive motor. The cancellation of the operation can be confirmed.
Since the notification unit is a speaker that informs by voice that the drive motor has been stopped, the speaker informs the stop of the drive motor by voice, so the medical worker can use the medicine due to the stop of the drive motor. The termination of the liquid transfer operation can be confirmed by voice.
Since the notification unit is a display unit that displays that the drive motor has been stopped, the display unit reports the stop of the drive motor. Therefore, the medical worker stops the liquid feeding operation of the medicine due to the stop of the drive motor. , Can be confirmed visually.

  A display unit for displaying information and an operation panel unit having operation buttons are placed on the upper part of the main body of the syringe pump, and a syringe setting unit and a moving member are placed on the lower part of the main body of the syringe pump ing. Thereby, the medical worker can perform the liquid transfer operation of the drug solution from the syringe while confirming the information on the display unit in the upper part of the main body. And a medical worker can operate the operation button of an operation panel part, confirming the information of the display part of the upper part of a 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. Each structure of the said embodiment can abbreviate | omit the one part, and can be arbitrarily combined so that it may differ from the above.
The drive motor 133 may be, for example, a three-phase step motor other than the two-phase step motor.

DESCRIPTION OF SYMBOLS 1 ··· Syringe pump, 2 ··· Housing, 6 ··· Syringe mounting portion, 7 ··· Syringe pusher driving portion, 10 ··· Syringe pusher pushing member (moving member), 80 ··· · Body part, 133 · · · Drive motor, 180 · · · Magnet rotor, 181 · · · Stator, 200, 300, 400 · · · Syringe, 201, 301, 401 · · · Syringe body, 202, 302, 402 ... Syringe presser, 205, 305, 405 ... Presser flange, 209, 309, 409 ... Body flange, 900 ... Pressure sensor

The syringe pump of the present invention is a syringe pump that delivers the drug in the syringe to a patient via a tube by pushing a syringe pusher of a syringe filled with the drug, and the syringe of the syringe A syringe setting unit that sets the main body , a drive motor that is a step motor, a moving member that pushes the syringe pusher by forward operation of the drive motor to transfer the medicine in the syringe to the patient, and the tube The pressure sensor detects the pressure at the time of pushing the syringe presser to detect the closed state, and the pressure detected by the pressure sensor with respect to the syringe attached to the syringe setting unit is in advance When the defined occlusion judgment reference value is exceeded, the occlusion relief processing is performed by starting the reverse rotation of the drive motor, and then the reverse rotation is stopped. Storing three conditions 1) to 3) below to leave, and a control unit which is reached in any condition of the three conditions to stop the reverse rotation operation of the drive motor, the drive A control unit for maintaining an excitation state of an input current waveform in a stop state of the drive motor for a predetermined time when stopping the reverse rotation operation of the motor; 1) a closing pressure of 50 mmHg or less; The “reverse rotation amount” becomes a predetermined number of steps for the attached syringe, and 3) becomes less than or equal to the integration amount at the start of liquid transfer when the integration amount includes the previous integration amount. It is characterized by having.
In addition, the syringe pump of the present invention is a syringe pump for transferring the drug in the syringe to a patient via a tube by pushing a syringe presser of a syringe filled with the drug, and the syringe A syringe setting unit for setting the syringe body, a drive motor which is a step motor, a moving member for pressing the syringe pusher by forward operation of the drive motor to send the medicine in the syringe to the patient, A pressure sensor for detecting a pressure when pushing the syringe presser in order to detect that the tube is in a closed state, and a pressure detected by the pressure sensor for the syringe attached to the syringe setting unit When the value exceeds the predetermined blockage judgment reference value, the blocker relief processing is performed by starting the reverse rotation of the drive motor, and then the reverse rotation is performed. Control unit for storing the following three conditions 1) to 3) for stopping the motor and stopping the reverse operation of the drive motor when any of the three conditions is reached, A control unit for maintaining an excitation state of an input current waveform in a stop state of the drive motor for a fixed time when stopping the reverse rotation operation of the drive motor; 1) the closing pressure is 50 mmHg or less; The “reverse rotation amount” defined in the above is characterized in that 3) the integrated amount is 0, which is a predetermined number of steps for the attached syringe.
According to the above configuration, the pressure sensor detects the pressure when pushing the syringe presser in order to detect that the tube is in the closed state, and the controller detects the pressure detected by the pressure sensor as a predetermined blockage. When the judgment reference value is exceeded , the drive motor which is a step motor is reversely operated, and when the pressure detected by the pressure sensor becomes lower than a predetermined blockage judgment reference value, the reverse operation of the drive motor is stopped. At this time, the control unit maintains the excitation state of the input current waveform in the stop state of the drive motor for a fixed time. As a result, when the tube bends or twists, and the blocked state of the tube is released, the drug delivery can be stopped while preventing the drug from flowing rapidly through the tube, and the drug delivery can be performed. It can enhance the safety of operation. In addition, by using a step motor as the drive motor, it is possible to easily perform reverse rotation operation from normal rotation operation of the drive motor. Furthermore, when stopping the reverse rotation operation of the drive motor rotor, the excitation state of the input current waveform in the stop state of the drive motor is maintained for a certain period of time, thereby preventing the rotor from rotating further reversely due to the inertia of the rotor. Because it can be used, there is no need to unnecessarily aspirate the drug in the tube.

Preferably, before Symbol pressure sensor is characterized in that it is mounted to the moving member.
According to the above arrangement, since the pressure sensor can be subjected to pressure from a syringe pushing element directly, easily detect the closed state of the tube.

Claims (8)

A syringe pump for delivering the drug in the syringe to a patient via a tube by pushing a syringe presser of a syringe filled with the drug,
A syringe setting unit configured to set a syringe body of the syringe;
Drive motor,
A moving member for sending the medicine in the syringe to the patient by pushing the syringe pusher by forward rotation of the drive motor;
A pressure sensor that detects a pressure at which the syringe presser is pushed to detect that the tube is in a closed state;
When the pressure detected by the pressure sensor with respect to the syringe mounted at the time of setting the syringe exceeds a predetermined occlusion determination reference value, reverse rotation of the drive motor is started to perform occlusion mitigation processing, and then And a control unit for storing the following three conditions 1) to 3) to stop the reverse rotation, and stopping the reverse operation of the drive motor even if any of the three conditions is reached: And 1) The occlusion pressure will be below the specified level (50 mmHg),
2) The “reverse rotation amount” determined for each of the syringes becomes a predetermined number of steps for the mounted syringes,
3) When the integrated amount includes the previous integrated amount, it becomes equal to or less than the integrated amount at the start of the current liquid feeding,
A syringe pump characterized by having. A syringe pump for delivering the drug in the syringe to a patient via a tube by pushing a syringe presser of a syringe filled with the drug,
A syringe setting unit configured to set a syringe body of the syringe;
Drive motor,
A moving member for sending the medicine in the syringe to the patient by pushing the syringe pusher by forward rotation of the drive motor;
A pressure sensor that detects a pressure at which the syringe presser is pushed to detect that the tube is in a closed state;
When the pressure detected by the pressure sensor with respect to the syringe mounted at the time of setting the syringe exceeds a predetermined occlusion determination reference value, reverse rotation of the drive motor is started to perform occlusion mitigation processing, and then And a control unit for storing the following three conditions 1) to 3) to stop the reverse rotation, and stopping the reverse operation of the drive motor even if any of the three conditions is reached: And 1) The occlusion pressure will be below the specified level (50 mmHg),
2) The “reverse rotation amount” determined for each of the syringes becomes a predetermined number of steps for the mounted syringes,
3) Integration amount becomes 0,
A syringe pump characterized by having.   The said drive motor is a step motor, The said pressure sensor is mounted in the movement member, The syringe pump of Claim 1 or Claim 2 characterized by the above-mentioned.   The syringe pump according to claim 3, wherein the control unit maintains excitation of the reverse rotation operation of the drive motor for a certain period of time when stopping the reverse rotation operation of the drive motor.   The syringe pump according to claim 1 or 2, further comprising: a notification unit that notifies that the drive motor is stopped when the drive motor is stopped.   6. The syringe pump according to claim 5, wherein the notification unit is a speaker that notifies by voice that the drive motor has been stopped.   The syringe pump according to claim 5, wherein the notification unit is a display unit that displays that the drive motor has been stopped. The display unit for displaying information and an operation panel unit having an operation button are placed on the upper part of the main body of the syringe pump, and the lower part of the main body of the syringe pump is the syringe setting part and the movement The syringe pump according to claim 7, wherein the member is placed.

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