JP2016209055A - Liquid supply device, medical device, and fault diagnosis method for liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of fault diagnosis.SOLUTION: A liquid supply device includes a liquid pump having a motor, a flow channel for circulating liquid from the liquid pump to a liquid injection unit, a rotational speed sensor for detecting a rotational speed N of the motor, a flow rate sensor for detecting a flow rate Q of the liquid in the flow channel, and a control unit for outputting a rotational speed indication value T to the motor. The control unit includes: a memory for storing first table data indicating correspondence allowed between two of T, N, and Q, and second table data indicating correspondence allowed between two of T, N, and Q, the combination of which is different from the combination in the first table data; and a fault diagnosis unit for performing fault diagnosis of at least one of the motor, the flow rate sensor, and the rotational speed sensor by checking T, N, and the flow rate Q against the first table data and the second table data.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a liquid supply device, a medical device, and a failure diagnosis method for the liquid supply device.

  As a medical device, a device including a pump that supplies liquid, a hand piece (jet unit) that ejects the liquid supplied from the pump, and a tube that forms a liquid supply path from the pump to the hand piece is known. (For example, Patent Document 1). According to Patent Literature 1, a bubble sensor is provided in a tube, and an alarm is issued when the bubble sensor detects that bubbles are mixed in the liquid.

JP 2010-77948 A

  According to the prior art, by using a bubble sensor, it is possible to detect mixing of bubbles as an example of a malfunction (abnormality) of the liquid supply apparatus. In such a liquid supply apparatus, it has been a problem to improve the reliability of diagnosis by further improving the countermeasure when there is a failure in a sensor or the like for detecting a failure.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) One embodiment of the present invention is a liquid supply apparatus for supplying a liquid from a liquid storage unit that stores a liquid to a liquid ejection unit having a nozzle. The liquid supply apparatus includes: a liquid pump having a motor; a flow path for circulating the liquid from the liquid pump to the liquid ejecting unit; a rotational speed sensor that detects a rotational speed of the motor; and You may provide the flow rate sensor which detects the flow volume of the said liquid, and the control part which outputs a rotational speed instruction value to the said motor. The control unit includes first table data indicating a correspondence relationship allowed between two of the rotation speed instruction value, the rotation speed, and the flow rate, the rotation speed instruction value, the rotation speed, and the A memory for storing a second table data indicating a permissible correspondence between two different combinations of the first table data among the flow rates, the rotation speed instruction value, the rotation speed, and the A failure diagnosis unit that performs failure diagnosis of at least one of the motor, the flow rate sensor, and the rotation speed sensor by comparing the flow rate with the first table data and the second table data; May be provided. According to the liquid supply device of this aspect, the rotational speed instruction value, the rotational speed, and the flow rate are collated with the first table data and the second table data, so that the motor, the flow sensor, and the rotational speed are collated. A fault diagnosis of at least one of the sensors is performed. Therefore, according to the liquid supply apparatus of this embodiment, the failure of the sensor or the pump can be diagnosed, so that the reliability of the failure diagnosis can be improved.

(2) In the liquid supply apparatus according to the aspect described above, the first table data indicates an allowable correspondence between the rotation speed and the rotation speed instruction value, and the second table data includes the rotation An acceptable correspondence between speed and the flow rate may be indicated. According to the liquid supply device of this aspect, it is possible to diagnose a rotational speed failure more reliably.

(3) In the liquid supply apparatus according to the aspect described above, the failure diagnosis unit may determine that the rotation speed instruction value, the rotation speed, and the flow rate are permitted by the first table data and the second table data. When the flow rate falls below a predetermined threshold while satisfying the relationship, it may be determined that there is an abnormality in the flow path from the liquid container to the nozzle. According to the liquid supply apparatus of this aspect, in addition to improving the reliability of failure diagnosis, it is possible to detect an abnormality in the flow path.

(4) In the liquid supply apparatus of the above aspect, the failure diagnosis unit may perform a failure diagnosis of each of the motor, the flow rate sensor, and the rotation speed sensor. According to the liquid supply apparatus of this aspect, the reliability of failure diagnosis can be further improved.

(5) Another embodiment of the present invention is a medical device. The medical device may include a liquid storage unit that stores liquid, the liquid supply device of the above-described form, and a liquid ejection device that receives supply of liquid from the liquid supply device. The medical device of this form can diagnose a failure of the sensor or the pump, and can improve the reliability of the failure diagnosis, like the liquid supply device of the above form.

(6) Another embodiment of the present invention is a failure diagnosis method for a liquid supply apparatus. A failure diagnosis method for a liquid supply apparatus includes a liquid supply apparatus for supplying a liquid to a liquid ejecting unit, a liquid pump having a motor, and a flow for circulating the liquid from the liquid pump to the liquid ejecting unit. A liquid supply apparatus comprising: a path; a rotation speed sensor that detects a rotation speed of the motor; a flow rate sensor that detects a flow rate of the liquid in the flow path; and a control unit that outputs a rotation speed instruction value to the motor. You may diagnose a failure. The failure diagnosis method of the liquid supply apparatus includes: first table data indicating a correspondence relationship allowed between two of the rotation speed instruction value, the rotation speed, and the flow rate; the rotation speed instruction value; The rotation speed and the second table data indicating the correspondence relationship allowed between two different combinations of the first table data among the flow rates, the rotation speed instruction value, the rotation speed, and the A failure diagnosis of at least one of the motor, the flow sensor, and the rotation speed sensor may be performed by checking the flow rate of the liquid in the flow path. The failure diagnosis method for the liquid supply device of this aspect can diagnose a failure of the sensor or the pump, as in the case of the liquid supply device of the above aspect, and can improve the reliability of the failure diagnosis.

(7) Another embodiment of the present invention is a liquid supply system. The liquid supply system includes a liquid pump having a motor, a flow path for flowing liquid from the liquid pump to the liquid ejecting unit, a rotation speed sensor for detecting a rotation speed of the motor, and the liquid in the flow path. A liquid supply device having a flow rate sensor that detects a flow rate, and a control unit that outputs a rotation speed instruction value to the motor, and a computer connectable to the liquid supply device, the rotation speed instruction value and the rotation The first table data indicating the correspondence relationship allowed between two of the speed and the flow rate is combined with the first table data of the rotation speed instruction value, the rotation speed, and the flow rate. And a computer that stores second table data indicating a correspondence relationship allowed between two different types. The computer compares the rotation speed instruction value, the rotation speed, and the flow rate with the first table data and the second table data, so that the motor, the flow sensor, and the rotation speed sensor At least one failure diagnosis may be performed. The liquid supply system of this form can diagnose a failure of the sensor or the pump as in the liquid supply apparatus of the above form, and can improve the reliability of the failure diagnosis.

  The present invention can be realized in various forms. For example, it can be realized in the form of a failure diagnosis method for the liquid supply apparatus, a program for realizing the failure diagnosis method, a storage medium storing the program, and the like.

It is explanatory drawing which shows roughly the structure of the medical device as 1st Embodiment of this invention. It is explanatory drawing which shows notionally the structure of a tube pump. It is a graph for demonstrating 1st table data. It is a graph for demonstrating 2nd table data. It is a flowchart which shows the control processing performed by CPU of a control apparatus. It is a flowchart which shows the detail of the priming process performed by FIG.5 S120. It is a flowchart which shows the detail of the failure diagnosis process at the time of the liquid injection performed by step S160 of FIG. It is explanatory drawing which shows schematically the structure of the medical system as 2nd Embodiment of this invention.

Next, an embodiment of the present invention will be described.
A. First embodiment:
A-1. overall structure:
FIG. 1 is an explanatory diagram schematically showing the configuration of a medical device 10 as a first embodiment of the present invention. The medical device 10 is used in a medical institution, and has a function of incising or excising an affected part by ejecting a liquid to the affected part. The medical device 10 includes a handpiece 20, a liquid supply unit 50, and a control device 80.

  The liquid supply unit 50 is a unit for supplying liquid to the handpiece 20, and includes a water supply bag 51, a spike needle 52, first to fifth connectors 53a to 53e, and first to fourth water supply tubes 54a to 54a. 54d, a pump tube 55, and a filter 57.

  The water supply bag 51 is made of a transparent synthetic resin, and is filled with a liquid (specifically, physiological saline). The spike needle 52 is connected to the first water supply tube 54a via the first connector 53a. When the spike needle 52 is stabbed into the water supply bag 51, the liquid filled in the water supply bag 51 can be supplied to the first water supply tube 54a. The liquid may be another liquid that is not harmful even if it is sprayed onto a living tissue, such as pure water or a chemical solution, instead of physiological saline.

  The first water supply tube 54a is connected to the tube pump 60 via the second connector 53b. The tube pump 60 is connected to the second water supply tube 54b via the third connector 53c.

  The tube pump 60 sends the liquid in the pump tube 55 from the first water supply tube 54a side to the second water supply tube 54b side. The tube pump 60 is driven by the drive signal received from the control device 80 via the pump cable 91. The detailed configuration of the tube pump 60 will be described later. A flow rate sensor 56 that detects the flow rate of the liquid is provided in the middle of the second water supply tube 54b.

  The second water supply tube 54b is connected to the third water supply tube 54c via the fourth connector 53d. A filter 57 is connected to the third water supply tube 54c. The filter 57 collects foreign matters contained in the liquid.

  The third water supply tube 54c is connected to the fourth water supply tube 54d through the fifth connector 53e. The fourth water supply tube 54 d is connected to the handpiece 20. The first to fourth water supply tubes 54a to 54d are tubes made of polyvinyl chloride and have elasticity. Note that the first to fourth water supply tubes 54a to 54d may be made of silicon or a thermoplastic elastomer.

  The handpiece 20 is an instrument that an operator holds and operates, and includes a liquid ejecting tube 22, a pulsation generator 24, and a housing 26. The pulsation generating unit 24 is supplied with liquid from the liquid supply unit 50 via the fourth water supply tube 54d. When a drive voltage is applied from the control device 80 via the actuator cable 92, the pulsation generator 24 imparts pulsation to the supplied liquid. The liquid to which the pulsation is imparted is ejected at high speed from the nozzle 22 a at the tip of the liquid ejection tube 22. The surgeon performs treatment such as incision or excision of the affected area by applying the pulsating liquid sprayed from the handpiece 20 to the living tissue that is the affected area of the patient. Hereinafter, the liquid to which pulsation is imparted is also referred to as a pulsating flow or a pulsed flow. The liquid to which pulsation is imparted means that the liquid is in a state where the flow rate or flow velocity is fluctuated. The fluctuation referred to here includes intermittent injection in which the flow rate or flow velocity becomes zero and repeats the injection and repeats the injection. However, since the flow rate or flow velocity of the liquid only needs to fluctuate, it does not necessarily need to be intermittent injection.

  In the present embodiment, the pulsation generator 24 is a well-known device including a piezo element (piezoelectric element) and a diaphragm. The piezoelectric element is operated by the drive voltage applied from the control device 80 to increase or decrease the volume of the liquid chamber partitioned by the diaphragm, thereby changing the pressure of the liquid in the liquid chamber and imparting pulsation to the liquid. The tube pump 60 is a subordinate concept of the “liquid pump” in one embodiment of the present invention, and the second to fourth water supply tubes 54 b to 54 d are a subordinate concept of the “flow path” in one embodiment of the present invention. Is a subordinate concept of the “liquid ejecting portion” in one embodiment of the present invention.

  The control device 80 is a device that controls the overall operation of the medical device 10, and in the present embodiment, is configured by a microcomputer including a CPU, a memory, and the like. The control device 80 is connected to a foot switch 94 that is operated by the operator with his / her foot. In particular, the control device 80 controls the tube pump 60 and the pulsation generator 24. Specifically, the control device 80 transmits a drive signal via the pump cable 91 and the actuator cable 92 while the foot switch 94 is depressed. The drive signal transmitted via the signal line 91 a included in the pump cable 91 drives the tube pump 60. When the tube pump 60 is driven, the liquid is supplied to the handpiece 20. The drive signal transmitted via the actuator cable 92 drives the pulsation generator 24. When the pulsation generator 24 is driven, pulsation is imparted to the liquid. Therefore, the pulse flow is ejected while the surgeon is stepping on the foot switch 94, and the pulse flow is stopped while the surgeon is not stepping on the foot switch 94.

  The control device 80 is connected to an ejection condition setting unit 96 for the user to set the liquid ejection conditions. The injection condition setting unit 96 includes a flow rate setting dial 97 and an applied voltage setting dial 98.

  The flow rate setting dial 97 is a dial type operation unit for an operator (or a user other than the operator) to set the flow rate (ml / min) of the liquid supplied from the liquid supply unit 50 to the handpiece 20. The applied voltage setting dial 98 is a dial type operation unit for setting an applied voltage (V) of a drive signal to be transmitted to the pulsation generating unit 24 by an operator (a user other than the operator is allowed).

  The control device 80 receives the liquid flow rate and the applied voltage set by the injection condition setting unit 96 and controls the tube pump 60 and the pulsation generating unit 24 to control the liquid injection from the handpiece 20. . Regarding the control of the tube pump 60, the control device 80 sends the rotational speed instruction value T for realizing the flow rate set by the injection condition setting unit 96 via the signal line 91 a (FIG. 1) of the pump cable 91. Output to the motor 68. Specifically, table data defining the correspondence between the flow rate and the rotation speed instruction value T is stored in advance in the memory of the control device 80, and the CPU of the control device 80 refers to this table data to set the setting data. The rotation speed instruction value T corresponding to the flow rate is acquired, and the acquired rotation speed instruction value T is output to the motor 68.

  The control device 80 is connected to a priming switch 99 for instructing execution of priming. The priming is a setup process for filling the liquid filled in the water supply bag 51 up to the liquid ejection pipe 22 of the handpiece 20 prior to the liquid ejection. The control device 80 executes priming when the priming switch 99 is pressed by the user.

A-2. Tube pump configuration:
FIG. 2 is an explanatory diagram conceptually showing the structure of the tube pump 60. As illustrated, the tube pump 60 includes a rotor 61 including a roller (pressing member) 62 and a stator (guide member) 65.

  The stator 65 has a shape having an arcuate recess 65a. The pump tube 55 described in FIG. 1 is disposed along the wall surface of the recess 65a. The pump tube (hereinafter, also simply referred to as “tube”) 55 is made of silicon, fluororubber, elastic resin, or the like, and has elasticity.

  Four rollers 62 are arranged on the outer periphery of the rotor 61 at equal intervals. The rotor 61 is rotated about the rotation shaft 63 by a motor 68 (FIG. 1). This motor is driven by the drive signal received via the signal line 91a (FIG. 1) of the pump cable 91. Each roller 62 is an idler wheel. The position of the rotor 61 with respect to the stator 65 is determined so that each roller 62 presses the tube 55. As the rotor 61 rotates in the R direction, the position of each roller 62 also rotates. As a result, the tube 55 is sequentially squeezed while being crushed by the rollers 62. As a result, the liquid in the tube 55 is conveyed. Note that the number of rollers 62 is not limited to four, and may be other numbers (one or more) such as three, two, one, five, and the like.

  As shown in FIG. 1, the tube pump 60 incorporates a rotation speed sensor 69. The rotational speed sensor 69 detects the rotational speed of the motor 68 per unit time, that is, the rotational speed N. The rotation speed sensor 69 is connected to the control device 80 via a signal line 91 b included in the pump cable 91.

A-3. Control unit configuration:
The control device 80 includes a failure diagnosis unit 80a as a function realized by a CPU executing a computer program stored in advance in a memory. Further, the control device 80 stores the first table data TB1 and the second table data TB2 in a memory in advance. The failure diagnosis unit 80a uses the first table data TB1 and the second table data TB2, and the flow rate sensor provided in the motor 68 provided in the tube pump 60 and the second water supply tube 54b on the downstream side of the tube pump 60. 56 and a failure of the rotational speed sensor 69 provided in the tube pump 60 is diagnosed.

  FIG. 3 is a graph for explaining the first table data TB1. The first table data TB1 indicates an allowable correspondence between the rotational speed N detected by the rotational speed sensor 69 and the rotational speed instruction value T sent from the control device 80 to the tube pump 60. When the tube pump 60 is operating normally, the rotational speed N and the rotational speed instruction value T match as shown by a broken line L1 in FIG. 3 and are in a proportional relationship. When the tube pump 60 is out of order, the relationship between the rotational speed N and the rotational speed instruction value T deviates from the broken line L1.

  Since there is a possibility that the broken line L1 may vary depending on the assembly accuracy of parts, errors, and the like, the lower limit line L1min and the upper limit line L1max are set by giving a width to the broken line L1 in this embodiment. That is, when the operating point determined from the rotational speed N and the rotational speed instruction value T is within the allowable range with the range from the lower limit line L1min to the upper limit line L1max being the allowable range (for example, the operating point P1 in the figure). ), The tube pump 60 is diagnosed as operating normally. On the other hand, when the operating point determined from the rotational speed N and the rotational speed instruction value T is outside the allowable range, that is, below the lower limit L1min (for example, at the operating point P2 in the figure) or above the upper limit L1max ( For example, in the case of the operating point P3), the tube pump 60 is diagnosed as not operating normally, that is, malfunctioning.

  The failure of the tube pump 60 mentioned here means that at least one of the motor 68 and the rotation speed sensor 69 is broken, that is, the motor 68 is broken, the rotation speed sensor 69 is broken, This corresponds to either of the failure of both the motor 68 and the rotation speed sensor 69.

  FIG. 4 is a graph for explaining the second table data TB2. The second table data TB2 indicates an allowable correspondence between the rotational speed N detected by the rotational speed sensor 69 and the flow rate Q detected by the flow rate sensor 56. When the tube pump 60 is operating normally, the rotational speed N and the flow rate Q are in a proportional relationship as indicated by a broken line L2 in FIG. When the tube pump 60 is out of order, the relationship between the rotational speed N and the flow rate Q deviates from the broken line L2.

  Since the broken line L2 may vary depending on the assembly accuracy, error, etc. of the parts, as in the first table data TB1, the broken line L2 is given a width so that the range is not less than the lower limit line L2min and not more than the upper limit line L2max. The allowable range. Similarly to the first embodiment, when the operating point determined from the rotational speed N and the flow rate Q is within the allowable range, it is assumed to be normal, and when it is out of the allowable range, it is diagnosed as a failure. The flow rate sensor 56 and the rotational speed sensor 69 are the objects of diagnosis. When the operating point is out of the allowable range, it is diagnosed that at least one of the flow rate sensor 56 and the rotation speed sensor 69 is out of order. That is, whether the flow rate sensor 56 is malfunctioning, the rotational speed sensor 69 is malfunctioning, or both the flow rate sensor 56 and the rotational speed sensor 69 are malfunctioning. Diagnose.

  As described above, the medical device 10 receives priming switch 99 to perform priming, and then receives foot switch 94 to perform liquid ejection. As shown in FIGS. 3 and 4, the tube pump 60 is driven at a relatively high rotational speed (priming rotational speed) N3 during priming, and from the rotational speed N1 to the rotational speed N2 during liquid ejection. The tube pump 60 is driven within the range. The magnitude relationship between the rotational speeds N1 to N3 is N1 <N2 <N3.

  The control device 80 performs the above-described failure diagnosis processing using the first and second table data TB1 and TB2 during priming and liquid ejection.

A-4. Control processing:
FIG. 5 is a flowchart showing a control process executed by the CPU of the control device 80. This control process is started after the medical device 10 is powered on. When the process is started, the CPU determines whether or not the priming switch 99 has been pressed (step S110). If it is determined that the button has not been pressed, the CPU repeatedly executes step S110 and waits for the button to be pressed. If it is determined in step S110 that the priming switch 99 has been pressed, the CPU executes a priming process (step S120). Details of the priming process will be described later.

  After the priming process is executed, it is determined whether or not the foot switch 94 has been pressed (step S130). If it is determined that the button has not been pressed, the CPU repeatedly executes step S130 and waits for the button to be pressed. If it is determined in step S130 that the foot switch 94 has been pressed, the CPU drives the piezo element of the pulsation generator 24 and the tube pump 60 (step S140). When the tube pump 60 is driven, the rotation speed instruction value T corresponding to the flow rate set by the injection condition setting unit 96 is set to the motor of the tube pump 60 using the table data stored in the memory as described above. Output to 68. In this control, the flow rate set by the injection condition setting unit 96 may be set as a target value, and feedback control may be performed so that the flow rate Q acquired from the flow rate sensor 56 matches the target value.

  After execution of step S140, the CPU determines whether or not the pressing of the foot switch 94 is continued (step S150). If it is determined that the foot switch 94 is continued, the CPU performs failure diagnosis during liquid ejection. Processing is executed (step S160). Details of the failure diagnosis process during liquid ejection will be described later.

  If it is determined in step S150 that the pressing of the foot switch 94 has ended, the CPU stops driving the piezo element of the pulsation generator 24 and the tube pump 60 (step S170). Thereafter, the control process ends.

  FIG. 6 is a flowchart showing details of the priming process executed in step S120 of FIG. When shifting to the priming process, the CPU rotates the tube pump 60 at the priming rotation speed N3 described above (step S210). Specifically, the CPU outputs the value of the priming rotation speed N3 to the motor 68 as the rotation speed instruction value T.

  Next, the CPU receives the rotational speed N detected by the rotational speed sensor 69 and output toward the control device 80 (step S220), and whether or not the received rotational speed N is within an allowable range of the priming rotational speed N3. Is determined (step S230). When both the motor 68 and the rotation speed sensor 69 are operating normally, the rotation speed N is within the allowable range. The upper and lower widths of the allowable range are predetermined experimentally or by simulation.

  If it is determined in step S230 that the rotational speed N does not fall within the allowable range, the CPU determines that at least one of the motor 68 and the rotational speed sensor 69 has failed, and turns the tube pump 60 on. Stop (step S240). Subsequently, it notifies the outside that at least one of the motor 68 and the rotation speed sensor 69 has failed (step S250). The tube pump 60 is stopped in step S240 by stopping the motor 68. The notification in step S250 is performed by providing a monitor in the injection condition setting unit 96 or the like and displaying on the monitor a message that at least one of the motor 68 and the rotation speed sensor 69 has failed. Note that a beep sound is output using a speaker (not shown) or a warning light (not shown) is flashed to notify only that there is an abnormality. The speed sensor 69) may be recorded in a memory or the like. The repair person can know the location of the possibility of failure by reading the contents recorded in the memory. After execution of step S250, the control process is terminated as being abnormal.

  If it is determined in step S230 that the rotation speed N is within the allowable range, the process proceeds to step S260. In step S260, the CPU determines whether or not a predetermined time has elapsed since the tube pump 60 was driven in step S210. The predetermined time is a time required for the liquid in the water supply bag 51 to reach the tip of the liquid jet tube 22 of the handpiece 20, and is 90 seconds, for example. If it is determined in step S260 that the predetermined time has not elapsed, the process returns to step S220 to continue the priming process.

  If it is determined in step S260 that the predetermined time has elapsed, the CPU receives the flow rate Q output from the flow rate sensor 56, assuming that the liquid is filled up to the liquid ejection tube 22 of the handpiece 20 (step S270), and the tube The pump 60 is stopped (step S280).

  Next, the CPU determines whether or not the flow rate Q received in step S270 is within an allowable range defined in the second table data TB2 (FIG. 4) (step S290). At the time of priming, it is driven at the priming rotational speed N3 in step S210. The allowable range of the flow rate Q at that time is the range from the lower limit line L1 to the upper limit L1max, that is, the range from Q3min to Q3max as shown in FIG. It is. For this reason, in step S290, it is determined whether or not the flow rate Q is within a range from Q3min to Q3max.

  If it is determined in step S290 that the flow rate Q is not within the range from Q3min to Q3max, it is determined that the flow sensor 56 is out of order and a notification to that effect is given (step S295). According to the second table data TB2 in FIG. 4, as described above, it is possible to diagnose that at least one of the flow rate sensor 56 and the rotational speed sensor 69 is out of order, but in step S230, the rotational speed sensor 69 is present. Has already been diagnosed as normal, it can be determined in step S295 that the flow sensor 56 has failed. As a notification method, it may be displayed on a monitor as in step S250, a beep sound may be output, or a warning light may blink. After execution of step S295, the control process is terminated as being abnormal.

  On the other hand, if it is determined in step S290 that the flow rate Q is within the range from Q3min to Q3max, the priming process is terminated (normal termination). When the process ends normally, the process goes through step S120 in FIG. 5 and proceeds to step S130.

  FIG. 7 is a flowchart showing details of the failure diagnosis process during liquid ejection executed in step S160 of FIG. When the process proceeds to the failure diagnosis process during liquid ejection, the CPU receives the rotational speed N output from the rotational speed sensor 69 (step S310), and the rotational speed instruction value T instructed to the motor 68 in step S140 (FIG. 5). (Step S320), and the flow rate Q output from the flow rate sensor 56 is received (step S330).

  Subsequently, the operating point determined by the rotational speed N received in step S310 and the rotational speed instruction value T acquired in step S320 is within the allowable range and outside the allowable range defined by the first table data TB1 (FIG. 3). Which of the following is applicable is determined (step S340). If it is determined that the value is outside the allowable range, the operating point determined by the rotational speed N received in step S310 and the flow rate Q received in step S330 is defined by the second table data TB2 (FIG. 4). Whether it falls within the permissible range or outside the permissible range is determined (step S350).

  If it is determined in step S350 that it falls outside the allowable range, the CPU stops the piezo element of the pulsation generating unit 24 and the tube pump 60 (step S352), and the rotation speed sensor 69 is faulty. The effect is notified (step S354). When it is determined that the first table data TB1 in FIG. 3 is out of the allowable range, as described above, at least one of the motor 68 and the rotation speed sensor 69 has failed. When it is determined that the second table data TB2 in FIG. 4 is out of the allowable range, as described above, at least one of the flow rate sensor 56 and the rotation speed sensor 69 is out of order. From these facts, when it is determined in step S340 that it is out of the allowable range and in step S350, it is determined that the rotational speed sensor 69 is out of order. Therefore, in step S354, it is notified that the rotation speed sensor 69 is out of order. As a notification method, as in step S250 (FIG. 5), it may be displayed on a monitor, a beep sound may be output, or a warning light may blink. After execution of step S352, it is determined that there is an abnormality, and the control process is terminated.

  If it is determined in step S350 that it falls within the allowable range, it can be determined that both the flow sensor 56 and the rotation speed sensor 69 are normal, and the motor 68 has failed due to the diagnosis result in step S340. It can be judged that there is. Therefore, if it is determined in step S350 that the value falls within the allowable range, the piezo element of the pulsation generating unit 24 and the tube pump 60 are stopped (step S356), and a notification that the motor 68 is out of order is provided. (Step S358). As a notification method, it may be displayed on a monitor as in step S354, a beep sound may be output, or a warning light may blink. After execution of step S358, the control process is terminated as being abnormal.

  If it is determined in step S340 that the value falls within the allowable range, the operating point determined by the rotational speed N received in step S310 and the flow rate Q received in step S330 is determined by the second table data TB2 (FIG. 4). It is determined whether it falls within the specified allowable range or outside the allowable range (step S360).

  If it is determined that the second table data TB2 is out of the allowable range, as described above, it can be determined that at least one of the flow rate sensor 56 and the rotation speed sensor 69 is out of order, and is within the allowable range in step S340. Since it can be determined that both the motor 68 and the rotation speed sensor 69 are normal, it can be determined that the flow sensor 56 is out of order when it is determined in step S360 that it is outside the allowable range. Therefore, if it is determined in step S360 that the value falls outside the allowable range, the piezo element of the pulsation generating unit 24 and the tube pump 60 are stopped (step S362), and the flow sensor 56 is in failure. Notification is made (step S364). As a notification method, it may be displayed on a monitor as in step S354, a beep sound may be output, or a warning light may blink. After execution of step S364, the control process is terminated as being abnormal.

  If it is determined in step S360 that it falls within the allowable range, it is determined whether or not the flow rate Q received in step S330 is below a predetermined threshold value Qst (step S370). If it is determined in step S360 that it falls within the allowable range, the motor 68, the rotation speed sensor 69, and the flow rate sensor 56 are all normal in conjunction with the determination in step S340 that the load falls within the allowable range. It can be judged. In this state, if it is determined in step S370 that the flow rate Q has fallen below the threshold value Qst, in the flow path from the water supply bag 51 to the nozzle 22a, the flow path is blocked or the liquid is discharged from the flow path to the outside. It can be determined that an abnormality such as a leaked liquid leakage state has occurred. Note that abnormalities in the flow path include blockage of the flow path, mixing of bubbles, liquid leakage from the flow path to the outside, and the like.

  Therefore, when it is determined that the flow rate Q has fallen below the threshold value Qst, the piezo element of the pulsation generator 24 and the tube pump 60 are stopped (step S372), and a notification is made that the flow path is in an abnormal state. (Step S374). As a notification method, it may be displayed on a monitor as in step S354, a beep sound may be output, or a warning light may blink. After execution of step S374, the control process is terminated as being abnormal.

  If it is determined in step S370 that the flow rate Q is greater than or equal to the threshold value Qst, the liquid ejection failure diagnosis process is exited.

A-5. Effects of the embodiment:
According to the medical device 10 of the present embodiment configured as described above, at the time of priming, it is diagnosed whether at least one of the motor 68 and the rotation speed sensor 69 has a failure, and the flow sensor 56. Can be diagnosed as to whether there is a failure. In addition, when liquid is ejected, a diagnosis is made as to whether each of the motor 68, the flow sensor 56, and the rotational speed sensor 69 has a failure, and the flow path from the water supply bag 51 to the nozzle 22a is in an abnormal state. It can be diagnosed whether or not there is. Therefore, according to the liquid supply apparatus of this embodiment, the reliability of failure diagnosis can be improved.

  Further, according to the medical device 10 of the present embodiment, the flow rate is supplied to the second upstream water supply tube 54b that is the most upstream among the second to fourth water supply tubes 54b to 54d that form the flow path downstream of the tube pump 60. Since the sensor 56 is provided, an abnormality in a relatively long path on the downstream side of the tube pump 60 can be diagnosed.

B. Second embodiment:
FIG. 8 is an explanatory diagram schematically showing the configuration of a medical system including a medical device as a second embodiment of the present invention. This medical system includes a medical device 110 corresponding to the medical device 10 of the first embodiment, a server SV, and a network NT that connects between the medical device 110 and the server SV. The network NT may be the Internet or a dedicated line. The medical device 110 is different from the medical device 10 of the first embodiment in the configuration of the control device 180. The control device 180 does not include the failure diagnosis unit 80a, the first table data TB1, and the second table data TB2 as compared with the control device 80 of the first embodiment, and a communication unit for connecting to the network NT The difference is that 180X is provided. The configuration of the medical device 110 other than the control device 180 is the same as that of the first embodiment. About the same part, the code | symbol same as 1st Embodiment is attached | subjected and the description is abbreviate | omitted.

  The communication unit 180X of the control device 180 includes a rotation speed N output from the rotation speed sensor 69 (see FIG. 1), a rotation speed instruction value T instructed to the motor 68 of the tube pump 60, and a flow rate sensor 56 (FIG. 1). The flow rate Q output from (see) is transmitted to the server SV via the network NT. The server SV is a computer including a CPU, a memory, and the like, and includes a failure diagnosis unit 80a, first table data TB1, and second table data TB2 included in the control device 180 in the first embodiment.

  The second embodiment having such a configuration has an effect that the medical device 110 can be remotely monitored and diagnosed.

C. Variations:
The present invention is not limited to the above-described embodiment and its modifications, and can be carried out in various modes without departing from the gist thereof. For example, the following modifications are possible.

・ Modification 1:
In the embodiment, the first table data TB1 indicates the allowable correspondence between the rotational speed N and the rotational speed instruction value T, and the second table data TB2 is the allowable relationship between the rotational speed N and the flow rate Q. The corresponding relationship is shown. Instead, the first table data TB1 shows an allowable correspondence between the rotational speed N and the rotational speed instruction value T, and the second table data TB2 is between the rotational speed instruction value T and the flow rate Q. It is good also as a structure which shows the corresponding | compatible relationship. Further, the first table data TB1 shows an allowable correspondence between the rotational speed N and the flow rate Q, and the second table data TB2 shows an allowable correspondence between the rotational speed instruction value T and the flow rate Q. It is good also as a structure to show. In short, the first table data has a configuration indicating a permissible relationship between two selected from the rotational speed instruction value T, the rotational speed N, and the flow rate Q, and the second table data is the rotational speed instruction value T. The two selected from the rotation speed N and the flow rate Q may be any structure as long as it shows a correspondence relationship allowed between two different combinations.

Modification 2
In the above-described embodiment, the pulsation generating unit 24 provided in the handpiece 20 is configured to include volume changing means including a piezo element and a diaphragm, but instead of this, the volume of the liquid chamber by a drive source other than the piezo element. It is good also as a structure which changes. Further, a bubble generating unit that generates bubbles in the liquid in the liquid chamber may be provided to change the pressure of the liquid in the liquid chamber. The bubble generating unit may be a light maser, a resistor heater, a ceramic heater, a configuration that irradiates microwaves, or the like.

・ Modification 3:
In the above embodiment, the liquid supply unit is a tube pump. However, instead of this, other types of pumps such as a piston pump and a plunger pump may be used.

-Modification 4:
The purpose of use of the medical device of the present invention may not be human therapy. For example, animals other than humans may be treated, or human tissue may be excised for research or education. Moreover, the tube pump of the present invention may be used in a cleaning device that removes dirt with the ejected liquid, or may be used in a drawing device that draws a line or the like with the ejected liquid.

-Modification 5:
In the embodiment, the flow rate sensor 56 is disposed in the second water supply tube 54b on the downstream side of the tube pump 60. However, the location where the flow rate sensor 55 is disposed is not limited thereto. You may arrange | position in the flow path of the upstream of the tube pump 60, and may arrange | position in the flow path of the downstream rather than the 2nd water supply tube 54b. The flow sensor 55 may be configured to be disposed at least in the flow path between the water supply back 51 (liquid storage unit) and the nozzle 22a.

Modification 6:
In the above-described embodiment, the failure diagnosis processing is performed both during priming and during liquid ejection. However, the failure diagnosis processing may be performed during either one of the operations. That is, it is sufficient to perform the failure diagnosis process at least during the priming and the liquid ejection. In addition to the priming and liquid ejection, only the failure diagnosis process may be performed alone.

Modification 7:
In the above embodiment, the failure diagnosis process is performed using both the first table data and the second table data. However, the failure diagnosis process may be performed using either one of the data. . In other words, the failure diagnosis process may be performed using at least one of the first table data and the second table data.

-Modification 8:
In the above embodiment, the CPU receives information output from each sensor. However, the configuration may be such that information is automatically output from each sensor to the CPU, or information from the CPU to each sensor. The output instruction may be output, and each sensor may output information to the CPU in response to the output instruction.

-Modification 9:
In the above embodiment, the injection condition setting unit includes the flow rate setting dial. However, instead of this, the injection condition setting unit may include a dial that sets the drive frequency and voltage of the piezoelectric element. That is, instead of a configuration that directly specifies the flow rate, a configuration that indirectly sets the flow rate can be obtained by having a table that defines the flow rate corresponding to the driving frequency and voltage of the piezoelectric element. .

  The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the above-described effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Medical device 20 ... Handpiece 22 ... Liquid injection pipe 22a ... Nozzle 24 ... Pulsation generating part 26 ... Case 50 ... Liquid supply part 51 ... Water supply bag 52 ... Spike needle 53a-53e ... 1st-5th connector 54a- 54d ... 1st-4th water supply tube 55 ... Pump tube (tube)
56 ... Flow sensor 57 ... Filter 60 ... Tube pump 61 ... Rotor 62 ... Roller 63 ... Rotating shaft 65 ... Stator 80 ... Control device 80a ... Fault diagnosis part 91 ... Pump cable 92 ... Actuator cable 94 ... Foot switch 96 ... Injection Condition setting unit 97 ... Flow rate setting dial 98 ... Applied voltage setting dial 99 ... Priming switch 110 ... Medical device N ... Rotational speed N3 ... Priming rotational speed Q ... Flow rate Qst ... Threshold T ... Rotational speed instruction value TB1 ... First table data TB2 ... 2nd table data NT ... Network NT
SV ... Server

Claims (7)

A liquid supply device for supplying a liquid from a liquid storage unit for storing a liquid to a liquid ejection unit having a nozzle,
A liquid pump having a motor;
A flow path for flowing the liquid from the liquid pump to the liquid ejecting section;
A rotational speed sensor for detecting the rotational speed of the motor;
A flow rate sensor for detecting the flow rate of the liquid in the flow path;
A controller that outputs a rotational speed instruction value to the motor,
The controller is
First table data indicating a correspondence relationship allowed between two of the rotation speed instruction value, the rotation speed, and the flow rate, and the first of the rotation speed instruction value, the rotation speed, and the flow rate. A memory for storing second table data indicating a permissible correspondence relationship between two different combinations from the table data of one;
By comparing the rotation speed instruction value, the rotation speed, and the flow rate with the first table data and the second table data, at least one of the motor, the flow rate sensor, and the rotation speed sensor. A fault diagnosis unit for performing one fault diagnosis;
A liquid supply apparatus comprising: The liquid supply apparatus according to claim 1,
The first table data indicates an allowable correspondence between the rotation speed and the rotation speed instruction value;
The liquid supply apparatus, wherein the second table data indicates an allowable correspondence between the rotation speed and the flow rate. The liquid supply apparatus according to claim 2,
The failure diagnosis unit
When the flow rate falls below a predetermined threshold while the rotation speed instruction value, the rotation speed, and the flow rate satisfy the correspondence relationship allowed by the first table data and the second table data, A liquid supply apparatus that determines that there is an abnormality in a flow path from the liquid container to the nozzle. A liquid supply apparatus according to any one of claims 1 to 3, wherein
The failure diagnosis unit is a liquid supply apparatus that performs failure diagnosis of each of the motor, the flow rate sensor, and the rotation speed sensor. A medical device,
A liquid container for containing a liquid;
A liquid supply device according to any one of claims 1 to 4,
A liquid ejecting apparatus that receives a supply of liquid from the liquid supply apparatus;
A medical device comprising: A liquid supply apparatus for supplying a liquid to a liquid ejecting unit, comprising: a liquid pump having a motor; a flow path for allowing the liquid to flow from the liquid pump to the liquid ejecting unit; and a rotational speed of the motor. A method of diagnosing a failure of a liquid supply device comprising: a rotational speed sensor to detect; a flow rate sensor to detect a flow rate of the liquid in the flow path; and a control unit that outputs a rotational speed instruction value to the motor. ,
First table data indicating a correspondence relationship allowed between two of the rotation speed instruction value, the rotation speed, and the flow rate, and the first of the rotation speed instruction value, the rotation speed, and the flow rate. Collating the rotation speed instruction value, the rotation speed, and the flow rate of the liquid in the flow path with the second table data indicating the allowable relationship between two different combinations of the table data of 1 A failure diagnosis method for a liquid supply apparatus, wherein failure diagnosis of at least one of the motor, the flow rate sensor, and the rotation speed sensor is performed. A liquid pump having a motor, a flow path for allowing liquid to flow from the liquid pump to the liquid ejecting unit, a rotational speed sensor for detecting the rotational speed of the motor, and a flow rate for detecting the flow rate of the liquid in the flow path A liquid supply apparatus having a sensor and a control unit that outputs a rotation speed instruction value to the motor;
A computer connectable to the liquid supply device, wherein the rotation speed instruction value, the rotation speed, and the flow rate instruction, a first table data indicating a correspondence relationship allowed between two of the rotation speed instruction value, the rotation speed, and the flow rate A second table data indicating a correspondence relationship allowed between two of the values, the rotation speed, and the flow rate, the combination of which is different from the first table data, and a computer that stores the second table data.
The computer
By comparing the rotation speed instruction value, the rotation speed, and the flow rate with the first table data and the second table data, at least one of the motor, the flow sensor, and the rotation speed sensor. Liquid supply system that performs two fault diagnosis.

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