JP2016059535A - Transfusion pump apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfusion pump apparatus capable of preventing free flow without using a dedicated component.SOLUTION: A transfusion pump apparatus 2 comprises: a pressure sensor 22 that detects pressure applied to a transfusion tube 10 between a pump finger 20b and a roller clamp 11; a CPU 25 that determines an opening/closing of the transfusion tube 10 on the basis of the detected pressure; a takeout key that starts a determination of the opening/closing of the transfusion tube 10; and a lock mechanism 23 that prohibits a takeout operation when the transfusion tube 10 is in an opening state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an infusion pump device having a pressurized liquid feeding section that performs infusion by pressing an infusion tube at a portion upstream of the attachment position of the tube opening / closing member.

  Conventionally, when performing infusion such as a drug solution into a patient's body, in order to perform quantitative infusion by controlling the infusion rate, a tube opening / closing member that opens and closes the infusion tube by pressing the infusion tube And an infusion pump device to which the infusion set is attached is known.

  As such an infusion pump device, for example, there is known a device that includes a pressurized liquid feeding section that performs infusion by pressing and perturbing a mounted infusion tube, and the infusion speed is controlled by the pressurized liquid feeding section ( For example, see Patent Document 1.)

  By the way, in this infusion set and infusion pump device, when the infusion tube attached after completion of the infusion is removed, if the infusion tube is not blocked by a tube opening / closing member such as a clamp, the drug solution is gravity in the open infusion tube. As a result, a phenomenon called free flow that falls spontaneously may occur, and unnecessary chemicals may flow into the patient's body.

  In order to prevent the free flow that occurs, an attachment that crushes and closes the infusion tube when the infusion tube is removed by attaching to the infusion tube is known (see, for example, Patent Document 2). .

Japanese Patent No. 4394072 JP 2004-141418 A

  However, in order to prevent free flow using a component such as the attachment described in Patent Document 2, a dedicated infusion pump device to which the attachment can be attached is necessary.

  This invention is made | formed in view of the above point, and it aims at providing the infusion pump apparatus which can prevent a free flow, without using an exclusive component.

  An infusion pump device according to the present invention is an infusion pump device in which a pressurized liquid feeding part is attached to a portion upstream of the attachment position of a tube opening / closing member of an infusion tube, and is provided between the pressurized liquid feeding part and the tube opening / closing member. The pressure detection unit that detects the pressure applied to the infusion tube by the liquid in the infusion tube, the tube open / close determination unit that determines the opening / closing of the infusion tube based on the change in pressure detected by the pressure detection unit, and the operator An open / close determination instruction unit that causes the tube open / close determination unit to start determining whether to open or close the infusion tube by operating, and when the tube open / close determination unit determines that the infusion tube is in an open state, an infusion tube removal operation is performed. And a removal prohibiting section for prohibiting the recording medium.

  Thus, in the infusion pump device of the present invention, the pressure detection unit provided between the pressurized liquid feeding unit and the tube opening / closing member detects a change in pressure applied to the infusion tube by the liquid in the infusion tube, and the tube An open / close determination unit determines whether the infusion tube is open or closed based on the detected pressure. And when it determines with an infusion tube being an open state, a removal prohibition part prohibits removal operation of an infusion tube.

  Therefore, according to the infusion pump device of the present invention, it is possible to prevent the operator from removing the infusion tube when the infusion tube is in an open state, so that free flow can be prevented without using dedicated parts. can do.

  Further, in the infusion pump device of the present invention, the tube opening / closing member is a roller clamp, and the tube opening / closing determination unit determines whether to open / close via the first pressure detected by the pressure detection unit after the completion of the infusion and the opening / closing determination instruction unit. It is preferable to determine whether the infusion tube is opened or closed by comparing the second pressure detected by the pressure detector after the instruction is given.

  A roller clamp commonly used to close an infusion tube clamps the infusion tube by closing the infusion tube by moving the roller along the axis of the infusion tube. Therefore, after the infusion is finished (with the amount of liquid in the infusion tube not changing), when the infusion tube is closed with a roller clamp, the infusion tube is tightened and the shape changes, and the infusion fluid is infused by the liquid in the infusion tube. The pressure applied to the tube varies slightly compared to the pressure before occlusion.

  Therefore, if the tube closure is a roller clamp, the opening and closing of the infusion tube can be easily confirmed by comparing the pressure applied to the infusion tube after completion of the infusion with the pressure applied to the infusion tube after the occlusion of the infusion tube by the roller clamp. Since it is possible, it becomes easier to prevent free flow.

  Further, in the infusion pump device of the present invention, the tube open / close determination unit causes the pressurization liquid supply unit to perform a predetermined amount of infusion after an open / close determination instruction is given via the open / close determination instruction unit, and before and after the infusion. It is preferable to determine whether the infusion tube is opened or closed by comparing the pressure detected by the pressure detector.

  For example, the pressure may change when the infusion pack connected to the infusion tube is exchanged or when the patient turns over. Then, such a change in pressure is mistaken as a change in pressure when the infusion tube is closed, and there is a possibility that the infusion tube can be removed in a state where the infusion tube is not closed.

  Therefore, if the operator causes the pressurized liquid feeding unit to perform a predetermined amount of infusion at the timing when the opening / closing determination instruction is given via the opening / closing determination instruction unit, the pressure change that can be detected by the pressure detection unit at any timing. Therefore, undetected and erroneous determination can be avoided. As a result, since the opening / closing of the infusion tube can be easily confirmed, it becomes easier to prevent free flow.

  Moreover, in the infusion pump apparatus of this invention, it is preferable to provide the alerting | reporting part which alert | reports the operation | movement of a removal prohibition part to an operator.

  If such an informing unit is provided, the operator is informed that the infusion tube is not blocked, so that it is easier to prevent the infusion tube from being removed in a non-occluded state, and free flow is further reduced. It becomes easy to prevent.

The perspective view which shows schematic structure of the infusion pump apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the removal prohibition part of the infusion pump apparatus of FIG. 1, 2A shows the state where removal is prohibited, and 2B shows the state where the prohibition of removal is cancelled | released.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the infusion set 1 of this embodiment includes an infusion tube 10 and a roller clamp 11 (tube opening / closing member) that opens and closes the infusion tube 10 by pressing the infusion tube 10. .

  The infusion pump device 2 includes an accommodating portion 20 that accommodates the infusion tube 10, a door 21 (lid portion) that opens and closes the accommodating portion 20, and a pressure that is disposed between the accommodating portion 20 and the roller clamp 11. A sensor 22 (pressure detection unit), a lock mechanism 23 (removal prohibition unit) that restricts the opening and closing of the door 21, and a lamp 24 (notification unit) for notifying the operator that the infusion tube 10 is not closed. And a CPU 25 (tube open / close determination unit) electrically connected to the pressure sensor 22.

  The infusion pump device 2 includes an unillustrated take-off key (open / close determination instruction unit) that is operated by the operator at the start of the detachment operation of the infusion tube 10 and an operation that the operator operates to start and stop the infusion. And an infusion control key shown in the figure.

  The roller clamp 11 has a flow rate adjusting roller 11a that can be rotationally moved along the infusion tube 10 so as to press the infusion tube 10. When the flow rate adjusting roller 11a is operated so as to move to the downstream side of the infusion tube 10, the infusion tube 10 is tightened to close the infusion tube 10 to prevent infusion. On the other hand, when the flow rate adjusting roller 11a is operated so as to move to the upstream side of the infusion tube 10, the tightening of the infusion tube 10 is released, the infusion tube 10 is opened, and infusion is possible.

  The accommodating part 20 presses the infusion tube 10 accommodated in the tube guide 20a for holding the infusion tube 10 and the upstream portion of the attachment position of the roller clamp 11 to perform infusion, and pressurizes Liquid part). Moreover, the accommodating part 20 is formed with a hollow part 20c for disposing a part of the lock mechanism 23 on the side of the tube guide 20a and the pump finger 20b.

  The pump finger 20b feeds the liquid in the infusion tube 10 by pressing and peristating the held infusion tube 10. The driving of the pump finger 20b is controlled by a signal from the infusion control key or a signal from the CPU 25.

  In the present embodiment, the pump finger 20b is used as the pressurized liquid feeding section, but the pressurized liquid feeding section of the present invention is not limited to such a configuration, and is upstream of the tube opening / closing member such as the roller clamp 11 or the like. Any liquid feed mechanism that can be closed on the side may be used. For example, a roller pump, a piston pump, a bellows pump, or the like may be used.

  The door 21 is fixed in a state in which the housing portion 20 is closed when a lock mechanism 23 described later is operated. Therefore, when the lock mechanism 23 is activated, the operation for removing the infusion tube 10 is prohibited. Further, the door 21 has a tube presser 21a for fixing the infusion tube 10 at a position facing the pump finger 20b when the door 21 is closed. In addition, the door 21 has an opening 21 b penetrating front and back at a position corresponding to the hollow portion 20 c of the housing portion 20 with a width corresponding to the opening / closing handle 23 a of the lock mechanism 23.

  The pressure sensor 22 detects the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10.

  As shown in FIG. 2, the lock mechanism 23 includes an opening / closing handle 23 a pivotally supported on a shaft 26 provided on the side wall of the opening 21 b of the door 21, and an engagement provided on the side wall of the housing unit 20. And a combination pin 23b. The open / close handle 23a is formed with a guide cam groove 23c that engages with the engagement pin 23b at a position closer to the housing portion 20 than the shaft 26 in the closed state (removal prohibited state (see FIG. 2A)).

  The guide cam groove 23 c is formed in an arc shape centered on the shaft 26. In addition, one end of the guide cam groove 23c is opened on the side opposite to the lever portion of the opening / closing handle 23a, and the engaging pin 23b can be advanced and retracted from the opened end.

  Therefore, when the door 21 is closed (see FIG. 2A), when the opening / closing handle 23a is rotated in a direction away from the housing portion 20 (clockwise in FIG. 2), the guide cam groove that engages with the engagement pin 23b. 23c moves the door 21 in a direction to separate it from the accommodating portion 20 (see FIG. 2B), and the door 21 is in an open state (a state in which the removal prohibition is released). Thereafter, when the opening / closing handle 23a is further pulled, the engagement pin 23b is detached from the guide cam groove 23c, and the door 21 is completely opened.

  The lock mechanism 23 includes a protrusion 23d formed on the outer peripheral side of the closed end portion of the guide cam groove 23c of the opening / closing handle 23a, and a latch 23e that is disposed in the cavity 20c of the housing portion 20 so as to freely advance and retract. And a spring 23f that urges the latch 23e in a direction protruding from the cavity 20c. The latch 23e can be retracted against the urging force of the spring 23f by operating a solenoid (not shown).

  When the CPU 25 (tube open / close determining unit) determines that the infusion tube 10 is open, the solenoid does not operate, and the latch 23e is maintained in the protruding state by the urging force of the spring 23f. As a result, since the latching state of the latch 23e and the protrusion 23d is maintained, the opening / closing handle 23a is prevented from rotating and the door 21 is prohibited from being opened.

  On the other hand, when the CPU 25 (tube open / close determination unit) determines that the infusion tube 10 is closed, the solenoid is activated and the latch 23e is retracted against the urging force of the spring 23f. As a result, the latch 23e and the protrusion 23d are unlocked, so that the opening / closing handle 23a can be rotated and the door 21 can be opened.

  In the present embodiment, the lock mechanism 23 is used as the removal prohibiting portion, but the removal prohibiting portion of the present invention is not limited to such a configuration, and the removal operation of the infusion tube 10 may be prohibited. Anything is possible. For example, the mechanism for directly controlling the holding state of the infusion tube 10 may be used instead of restricting the opening and closing of the door 21.

  The lamp 24 includes a light bulb, a light emitting element, and the like, and emits light to notify the operator whether or not the lock mechanism 23 is operating, that is, whether or not the infusion tube 10 is in an open / closed state. .

  In the present embodiment, the lamp 24 is used as the notification unit, but the notification unit of the present invention is not limited to such a configuration. For example, a sound such as a buzzer, an electronic sound, or a sound may be used, or a sound and light may be used in combination.

  The CPU 25 determines whether the infusion tube 10 is opened or closed based on the change in pressure detected by the pressure sensor 22. As a result of this determination, when it is determined that the infusion tube 10 is in the open state, the lock mechanism 23 is activated and the removal operation of the infusion tube 10 is prohibited.

  A take-out key (not shown) transmits a signal that causes the CPU 25 to start the determination of opening / closing of the infusion tube 10 when operated by an operator.

  Further, in the infusion pump device 2 of the present embodiment, the protrusion 23d of the opening / closing handle 23a of the lock mechanism 23 is formed of a magnet, and the latch 23e is formed of a ferromagnetic material. Further, in the hollow portion 20c of the housing portion 20, the magnetic sensor 27 is disposed at a position corresponding to the side surface of the end portion of the latch 23e on the spring 23f side in a state where the latch 23e protrudes.

  Therefore, when the protrusion 23d and the latch 23e are close to each other (see FIG. 2A), the latch 23e is magnetized by the magnetic force of the protrusion 23d, so that the magnetic sensor 27 detects the magnetism of the latch 23e. That is, the magnetic sensor 27 can detect the closing of the door 21.

  On the other hand, when the protrusion 23d and the latch 23e are separated from each other (see FIG. 2B), the latch 23e is not magnetized by the magnetic force of the protrusion 23d or even if it is magnetized. The magnetic sensor 27 does not detect magnetism. In other words, the opening of the door 21 can be detected by the magnetic sensor 27.

  Next, infusion performed using the infusion pump device 2 will be described.

  When performing infusion using the infusion pump device 2 of the present embodiment, first, the operator operates the opening / closing handle 23 a to unlock the door 21 and opens the door 21. Thereafter, the operator holds the infusion tube 10 so that the tube guide 20 a is not loosened, and accommodates the infusion tube 10 in the accommodating portion 20. Thereafter, the operator closes the door 21 and operates the opening / closing handle 23a to lock the door 21.

  At this time, the infusion tube 10 is pressed by the pump finger 20b and the tube presser 21a, and at least a part thereof is closed. Therefore, at this time, even if the infusion tube 10 is not closed by the roller clamp 11, no free flow occurs.

  Next, the operator operates the infusion control key after opening the infusion tube 10 when the infusion tube 10 is closed as it is when the infusion tube 10 is opened by the roller clamp 11, and the pump finger 20b is operated. Drive to start infusion.

  Next, the operator operates the infusion control key to stop the driving of the pump finger 20b and finish the infusion (that is, make the amount of the liquid in the infusion tube 10 not change). At this time, the pressure sensor 22 detects the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 and transmits it to the CPU 25. Then, the CPU 25 stores the pressure as the first pressure.

  Next, the operator operates the flow rate adjustment roller 11 a of the roller clamp 11 so as to move to the downstream side of the infusion tube 10 to close the infusion tube 10.

  At this time, if the infusion tube 10 is closed by the roller clamp 11, the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 slightly changes compared to the pressure before the closing. This is because, after completion of the infusion, the amount of medicinal solution stored between the occluded portion by the pump finger 20b of the infusion tube 10 and the occluded portion by the roller clamp 11 is constant, whereas the content of the infusion tube 10 in the meantime This is because the product slightly changes due to the movement of the flow rate adjusting roller 11 a of the roller clamp 11.

  Next, the operator presses the take-out key (open / close determination instruction unit). At this time, the pressure sensor 22 detects the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 and transmits it to the CPU 25. Then, the CPU 25 stores the pressure as the second pressure.

  Next, the CPU 25 compares the first pressure and the second pressure, and determines that the infusion tube 10 is in a closed state when the difference between the pressures is greater than or equal to a predetermined value (first step). 1). On the other hand, when there is no difference between these pressures or when the size is less than a predetermined value, it is determined that the infusion tube 10 is in an open state.

  Next, the pressure sensor 22 detects the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 and transmits it to the CPU 25. Then, the CPU 25 stores the pressure as a third pressure.

  Next, the CPU 25 drives the pump finger 20b to perform a predetermined amount of infusion. At this time, if the infusion tube 10 is closed by the roller clamp 11, the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 is a predetermined amount of infusion compared to the pressure before the closure. It changes depending on the situation.

  At this time, if the infusion tube 10 remains open, there is a concern that excessive infusion will be performed on the patient. However, when the infusion tube 10 is closed, the amount of infusion required to set the pressure detected by the pressure sensor 22 to 1 atmosphere or more that is easy to detect is about 0.8 ml. Even if the infusion tube 10 is opened, excessive infusion is not performed on the patient.

  Next, the pressure sensor 22 detects the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 and transmits it to the CPU 25. Then, the CPU 25 stores the pressure as the fourth pressure.

  Next, the CPU 25 compares the third pressure with the fourth pressure, and determines that the infusion tube 10 is in a closed state when the difference between the pressures is greater than or equal to a predetermined value (first step). 2). On the other hand, when there is no difference between these pressures or when the size is less than a predetermined value, it is determined that the infusion tube 10 is in an open state.

  When it is determined by the first determination method and the second determination method that the infusion tube 10 is closed, the CPU 25 operates a solenoid (not shown) to resist the urging force of the spring 23f. To retreat. As a result, the latch 23e and the protrusion 23d are unlocked, so that the opening / closing handle 23a can be rotated and the door 21 can be opened. Therefore, the operator can remove the infusion tube 10 from the infusion pump device 2.

  On the other hand, when it is determined by the first determination method or the second determination method that the infusion tube 10 is open, the CPU 25 keeps the latch 23e protruding without operating the solenoid (not shown). maintain. As a result, since the latching state of the latch 23e and the protrusion 23d is maintained, the opening / closing handle 23a is prevented from rotating and the door 21 is prohibited from being opened. Therefore, since the removal of the infusion tube 10 is prevented, the occurrence of free flow is prevented.

  As described above, in the infusion pump device 2 of the present embodiment, the pressure sensor 22 (pressure detection unit) provided between the pump finger 20b (pressure feeding unit) and the roller clamp 11 (tube opening / closing member) A change in the pressure applied to the infusion tube 10 by the liquid in the infusion tube 10 is detected, and the CPU 25 (tube open / close determination unit) determines the pressure of the infusion tube 10 based on the detected pressure (first to fourth pressures). Open / close is determined. And when it determines with the infusion tube 10 being an open state, the locking mechanism 23 (removal prohibition part) prohibits the removal operation of the infusion tube 10.

  Therefore, according to the infusion pump device 2 of the present embodiment, it is possible to prevent the operator from removing the infusion tube 10 when the infusion tube 10 is in an open state, without using dedicated parts, Free flow can be prevented.

  Although the illustrated embodiment has been described above, the present invention is not limited to such a form.

  In the above embodiment, after performing a determination method (first determination method) for comparing the first pressure detected after the end of the infusion and the second pressure detected after the infusion tube 10 is closed, a predetermined amount of the infusion is performed. A determination method (second determination method) for comparing the third pressure detected before performing a predetermined amount of infusion and the fourth pressure detected after performing a predetermined amount of infusion is used to determine whether the infusion tube 10 is opened or closed. doing. However, the infusion pump device of the present invention does not necessarily need to use two types of determination methods in combination.

  For example, the opening / closing of the infusion tube 10 may be determined only by the first determination method or only by the second determination method. Note that when only the second determination method is used, it is not necessary to cause a change in pressure by using a roller clamp, and therefore a device other than the roller clamp may be used as the tube opening / closing member.

  Moreover, in the said embodiment, it is comprised so that determination of the opening / closing of the infusion tube 10 may be started when an operator operates the taking-out key which is an opening / closing determination instruction | indication part. However, the infusion pump device of the present invention does not necessarily have to determine opening / closing of the infusion tube after the operator gives an instruction via the opening / closing determination instruction section.

  For example, after the infusion is terminated by the infusion control key, the pressure (first pressure) applied to the infusion tube continues to be detected, and then the infusion tube is closed with a roller clamp so that the pressure changes. When the second pressure is detected (that is, when the second pressure is detected), the removal prohibition by the removal prohibition unit may be automatically released.

  In addition, when it is set as such a structure, while prohibiting taking out is cancelled | released, it is preferable to alert | report that the obstruction | occlusion by a roller clamp is performed to an operator via an alerting | reporting part. If the notification unit is configured to notify the blockage, it is possible to make the operator forget to close the roller clamp by not performing the notification, and thus it is easy to prevent free flow.

DESCRIPTION OF SYMBOLS 1 ... Infusion set, 2 ... Infusion pump apparatus, 10 ... Infusion tube, 11 ... Roller clamp (tube opening / closing member), 11a ... Flow rate adjustment roller, 20 ... Storage part, 20a ... Tube guide, 20b ... Pump finger (pressurized liquid feeding) Part), 20c ... hollow part, 21 ... door (lid part), 21a ... tube press, 21b ... opening part, 22 ... pressure sensor (pressure detection part), 23 ... lock mechanism (removal prohibition part), 23a ... opening / closing handle , 23b ... engaging pin, 23c ... guide cam groove, 23d ... projection, 23e ... latch, 23f ... spring, 24 ... lamp (notification part), 25 ... CPU (tube open / close judgment part), 26 ... shaft, 27 ... Magnetic sensor.

Claims (4)

An infusion pump device in which a pressurized liquid feeding part is attached to a portion upstream of the attachment position of the tube opening / closing member of the infusion tube,
A pressure detection unit that detects a pressure applied to the infusion tube by the liquid in the infusion tube between the pressurized liquid feeding unit and the tube opening and closing member;
A tube open / close determination unit that determines open / close of the infusion tube based on a change in pressure detected by the pressure detection unit;
An open / close determination instruction unit that causes the tube open / close determination unit to start determination of opening / closing of the infusion tube by an operation by an operator;
An infusion pump device comprising: a removal prohibiting unit that prohibits a removal operation of the infusion tube when the infusion tube is determined to be open by the tube open / close determination unit. The infusion pump device according to claim 1,
The tube opening and closing member is a roller clamp,
The tube open / close determination unit includes a first pressure detected by the pressure detection unit after completion of the infusion and a second pressure detected by the pressure detection unit after an open / close determination instruction is made via the open / close determination instruction unit. An infusion pump device that determines whether the infusion tube is opened or closed by comparing. The infusion pump device according to claim 1 or 2,
The tube open / close determining unit, after receiving a signal from the open / close determination instructing unit, causes the pressurized liquid feeding unit to perform a predetermined amount of infusion, and compares the pressure detected by the pressure detection unit before and after the infusion. Therefore, the infusion pump device is characterized by determining whether the infusion tube is opened or closed. The infusion pump device according to any one of claims 1 to 3,
An infusion pump device comprising: a notification unit that notifies an operator of the operation of the removal prohibition unit.