JP2963514B2 - Infusion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an infusion control device, and can be used for controlling infusion using a syringe or a tube pump.

(Background technology)

2. Description of the Related Art Conventionally, automatic medical fluid injectors have been used at medical sites to perform constant drug injections such as infusions over a long period of time. As such an injector, a syringe-type or tube-type infusion pump capable of preventing foreign substances from being mixed in from the aspect of hygiene of a chemical solution is employed. In addition, in an industrial quantitative discharge device (dispenser), an infusion pump of the same type is adopted in consideration of handling of corrosive and abrasive liquids.

Among them, the syringe-type infusion pump pumps the liquid in the syringe by pushing an inner cylinder inserted into a so-called syringe-type glass syringe with a drive motor or the like. In addition, a tube-type infusion pump is provided with a corrosion-resistant flexible tube made of fluororesin or silicone rubber between liquid flow paths, and a roller is pressed from outside with a finger or the like to pump the liquid inside. It is.

In such an infusion pump, there is a relationship of D = FT between the total amount D of the liquid to be delivered, the flow rate F of the liquid to be delivered, and the time T of the delivery. Also, assuming that a sectional constant A indicating an effective passage sectional area of a tube including a passage sectional area of a syringe and a deflection amount due to handling, a moving speed V of a syringe inner cylinder and rollers, and a moving distance (stroke) S = VT. , Flow velocity F =
AV, quantitative D = AS.

For this reason, in the operation control of the infusion pump, the infusion condition is determined by any two of the total amount D, the flow velocity F, and the time T, and as a specific control, the syringe inner cylinder or the roller is controlled so as to satisfy the above condition. And other movement controls.

For example, when the total amount D and the flow side F are designated, the rotation of the drive motor is adjusted so that the moving speed V = A / F, and the liquid is delivered only for the time T = D / F. Is controlled. When the total amount D and the time T are designated, the moving speed T = S / T is obtained from the moving distance S = A / D, and the control is performed such that the liquid is delivered at the speed V for the operation time T. doing.

The operating time T, the moving speed V, and the like are appropriately adjusted in the infusion pump. However, as for the cross-sectional constant A, it is general to use the nominal diameter and the standard cross-sectional area of the syringe or tube used.

[Problems to be solved by the invention]

By the way, in the above-mentioned infusion pump, the syringe and the inner cylinder are slid with each other, and the tube is repeatedly peeled off by a roller or the like, so that abrasion causes errors over time in the cross-sectional area and the like.

In order to cope with such a temporal change, replacement of a syringe or a tube is frequently performed. Also, in medical practice, it is common to change instruments each time they are used in order to prevent infection and the like. However, the tubes and syringes to be replaced do not always have a constant cross-sectional area in accordance with the standard due to a difference in solids due to a manufacturing error or the like.

Therefore, when the operation speed is set based on the specified cross-sectional area in the control as in the conventional infusion pump, there is a problem that the initial flow velocity and flow rate cannot be actually obtained, and as a result, the accuracy of the infusion state is reduced.

On the other hand, it is also conceivable to check the state of the liquid actually delivered during the infusion control and adjust the feedback, but the control system becomes complicated and the equipment becomes larger,
Deterioration in handling becomes a problem. Further, there is a problem that precise measurement is difficult due to a very small flow rate in chemical injection or the like, and precise control cannot be actually performed.

An object of the present invention is to provide an infusion control device capable of always performing accurate infusion.

[Means for solving the problem]

The present invention is based on the finding that, in order to perform a precise infusion with an infusion pump, it is necessary to perform control according to a syringe or a tube to be used, and in particular, an infusion pump equipped with a syringe or a tube is actually used. The purpose of the present invention is to realize a control according to a syringe or a tube to be used by performing a calibration operation by driving.

For this purpose, the present invention provides, as an infusion control device, operation control means for operating the infusion pump under designated infusion conditions, and calibration means for calibrating the infusion state of the infusion pump. A calibration operation control unit configured to calibrate the infusion pump under predetermined calibration conditions; a calibration completion confirmation unit configured to terminate the calibration operation when a predetermined stop state is detected; and A variable measuring unit for measuring a predetermined variable relating to the infusion state, and a constant setting unit for setting an operation constant for the infusion pump in the operation control means based on the measured variable.

Here, the calibration end confirmation unit is assumed to detect that the infusion amount D by the calibration operation has reached a certain value, the variable measurement unit is assumed to measure the moving distance S of the calibration operation, and the constant A = D / S can be set. Alternatively, after measuring the time T and calculating the moving distance S = VT from the moving speed V, a constant A = D / S may be set.

Alternatively, the calibration completion confirmation unit is set to perform the calibration operation for a predetermined time T.
It is assumed that the elapsed time has been detected, and the variable measuring unit measures the infusion amount D by the calibration operation.
After calculating the moving distance S = VT, the constant A = D / S may be calculated. Alternatively, the constant A = D / S may be calculated directly, based on the fact that it has been moved by the fixed distance S.

[Operation] In the present invention as described above, when the syringe or the tube is replaced, or the calibration means is started periodically, and the calibration operation is performed by actually operating the infusion pump under predetermined conditions, thereby controlling the operation. In the means, an accurate operation constant corresponding to the mounted syringe or tube is set. And
In an actual operation, the operation control means controls the operation of the infusion pump based on the operation constants previously set in the calibration operation, and performs an accurate infusion corresponding to an intended infusion state. These objects are achieved by these.

〔Example〕

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

First Embodiment FIG. 1 shows a syringe-type infusion pump 10 to be controlled in the present embodiment.

The infusion pump 10 has a case 11, in which a guide rail 12 and a feed screw shaft 13 are arranged in parallel. A moving member 14 is slidably supported through the guide rail 12, and a feed screw shaft 13 is threaded through the moving member 14. A step motor 15 installed at the end of the case 11 is connected to the feed screw shaft 13, and the moving member 14 is moved along the guide rail 12 by rotating the feed screw shaft 13 with the step motor 15. You. An adjusting handle 16 is provided at the other end of the feed screw shaft 13, and the position of the moving member 14 can be adjusted by manual operation.

A syringe 20 is openable and closable on the upper end of the case 11
It is crimped and fixed detachably by 17. The syringe 20 presses the inner liquid by pushing the inner cylinder 21 and sends out the liquid from the nozzle 22 or the tube 23 at the tip to the infusion target. On the other hand, a slit 18 extending from the holder 17 to the opposite end is formed on the upper surface of the case 11, and an upper portion of the moving member 14 is exposed through the slit 18, so that the exposed moving member 14
Is engaged with the end of the inner cylinder 21 of the syringe 20. Therefore, the inner cylinder 21 is pushed in by moving the moving member 14 by the stepping motor 15 or the like, and the infusion operation by the syringe 20 is performed.

An infusion control device 30 according to the present invention is connected to such an infusion pump 10 in order to control an infusion operation.

As shown in FIG. 2, the infusion control device 30 includes an operation control means 31 for operating the infusion pump 10 under the infusion conditions designated with reference to a predetermined operation constant.
Calibration means 40 for setting an operation constant according to 10 is provided.

The operation control means 31 includes a motor driver 32, a main control unit 33,
A normal operation start switch 34, a clock timer 35, an operation condition storage unit 36, and a condition input unit 37 are provided.

The motor driver 32 rotates the stepping motor 15 by pulse output at a predetermined rate, and controls the syringe of the infusion pump 10
20 is operated at the speed V, and the pulse rate is adjusted according to the speed V input from the main control unit 33.

The main control unit 33 controls the normal infusion operation of the infusion pump 10 by operating the normal operation start switch 34. Specifically, the main control unit 33 refers to the operation condition storage unit 36 and controls the operation speed V and the like. The operating conditions are set in the motor driver 32, and the start and stop of the motor driver 32 are controlled so as to reach a predetermined operating time with reference to the clock timer 35.

In the operating condition storage unit 36, the total amount Do, the flow rate Fo, and the like are stored as infusion conditions to be controlled in the infusion pump 10, and the effective cross-sectional area A of the syringe 20 is stored as the operating constant of the infusion pump 10. . Of these, the infusion conditions and the like are manually input from the condition input unit 37, but the cross-sectional area A is accurately set by the calibrating means 40 in accordance with an error or the like for each syringe 20 used.

The calibration means 40 includes a calibration operation control unit 41, a calibration switch 42, a calibration condition storage unit 43, a calibration end confirmation unit 44,
A variable measurement unit 45 and a constant setting unit 46 are provided, and a calibration end confirmation unit 44
Is connected to a measuring output of an external measuring device 47.

The calibration operation control unit 41 includes a calibration switch 42
The infusion pump 10 is calibrated by the above operation, and the cross-sectional area A corresponding to the syringe 20 to be used is obtained and set in the operation control means 31. Specifically, referring to the calibration condition storage unit 43, a predetermined calibration condition is set in the main control unit 33, the infusion pump 10 is operated, and the operation is stopped by the signal STP from the calibration completion confirmation unit 44, A predetermined variable measured by the variable measuring unit 45 is subjected to arithmetic processing by the constant setting unit 46 to set the cross-sectional area A.

The calibration condition storage unit 43 stores an infusion pump as a calibration condition.
Total volume Dc and operation speed Vc of calibration infusion operation that 10 should perform
It is remembered. These calibration conditions can be set or changed from the condition input unit 37.

The calibration end confirmation unit 44 monitors the weighing output d of the externally connected weighing device 47, and stores the total amount set in the calibration condition storage unit 43.
A comparison with Dc is performed, and a stop signal STP is output when the measurement d = the total amount Dc.

An electronic balance or the like capable of outputting an external signal is used for the measuring device 47. The infusion amount directly measured is the weight w, but the volume d = w / w is set by setting the specific gravity ρ of the infusion. ρ is obtained.

The variable measuring unit 45 calculates the infusion time of the infusion pump 10 as a variable.
It is set to measure Tc. Specifically, the timer starts counting from the time when the motor 15 starts operating based on the command of the calibration operation control unit 41, and stops counting when the stop signal STP is output from the calibration end check unit 44. Output the elapsed time Tc.

The constant setting unit 46 uses the time Tc from the variable measurement unit 45, the total amount Dc and the speed Vc from the calibration condition storage unit 43,
The cross-sectional area A of 20 is calculated as D = Dc / (Vc · Tc), and the obtained cross-sectional area A is stored in the operating condition storage unit 36.

In this embodiment, the calibration operation is performed prior to the original infusion operation. In the calibration operation, the syringe 20 filled with liquid is used as in the normal infusion operation.
Set to 10, and weigh the tube 23 at the tip of the syringe 20
Connect to 47. Then, the calibration means 40 is activated to perform a calibration operation using the actual infusion pump 10 to set the cross-sectional area A of the syringe 20 to be used.

As shown in FIG. 3, the infusion control device 30 enters the calibration operation mode by operating the calibration switch 42 (process C10), and executes the calibration operation under the control of the calibration operation control unit 41. The calibration operation control unit 41 includes a calibration condition storage unit 43
The controller reads the total amount Dc and the speed Vc from (step C11), sets the respective values in the main control unit 33 and the calibration end check unit 44, and resets the measuring device 47 (step C12). And the variable measurement unit 4
5, the timer is started using the clock timer 35 (process C13), and the main controller 33 controls the motor 15 to operate at the speed Vc.
(Process C14). As a result, a liquid is sent out from the syringe 20, and the amount is sequentially measured by the measuring unit 47.
The calibration end confirmation unit 44 sequentially compares the measured current liquid amount d with the previously set total amount Dc (process C15), and repeats the operation during d <Dc, and becomes d ≧ Dc. At this point, the timing is stopped (process C16), and the advance of the motor 15 is stopped (process C17). The calibration operation control unit 41 sends the measured time t = Tc, the total amount Dc, and the speed Vc to the constant calculation unit 46, where the cross-sectional area A = Dc / (TcVc) is calculated (processing C18). Is stored in the operation condition storage unit 36 (process C19).

Next, when performing a normal infusion operation, the syringe 20 filled with a predetermined liquid is set in the infusion pump 10, the distal end tube 23 is connected to the infusion target of the main body, and the operation control means 31 is activated.

As shown in FIG. 3, the infusion control device 30 enters the normal operation mode by operating the normal operation start switch 34 (process S10), and executes the normal operation under the control of the main control unit 33. The main control unit 33 reads the total amount Do and the flow velocity Fo set by the condition input unit 37 from the operating condition storage unit 36 (processing
S11), the operation time To = Do / Fo is calculated from each value (processing S1)
2), the operation time Vo = Fo / A is calculated (process S1).
3). Then, time measurement is started using the clock timer 35 (process S14), and the speed V
The motor 15 is moved forward by o (process S15). As a result, the liquid is delivered from the syringe 20, and the flow rate becomes F = AVo = Fo. The main controller 33 sequentially compares the current elapsed time t with the operation time To (step S16), continues the operation during t <To, and stops the forward movement of the motor 15 when t ≧ To. (Step S17). As a result, the total amount of the infused liquid becomes D = AVoTo = Do, and the infusion of the total amount Do is achieved at the desired flow rate Fo.

According to this embodiment, the infusion operation according to the infusion conditions set in advance by the infusion control device 30 is performed by the infusion pump 10.
Can be performed.

At this time, prior to the original infusion operation, the cross-sectional area A of the syringe 20 used by the calibration operation for actually infusing a certain amount is infused.
In the subsequent normal infusion operation, the operating conditions are determined from this cross-sectional area A and the specified infusion conditions to determine the infusion pump.
10 can be controlled, and therefore, even if there is a manufacturing error or the like as a difference in the individualities of the syringe 20, these can be compensated for and an accurate infusion can be performed.

The operating area to be calibrated is the cross-sectional area A of the syringe 20.
Therefore, the relationship D of the total amount D, the flow velocity F, the operation speed V, and the operation time T depends on the infusion condition set for each infusion.
Operation conditions can be easily set based on = FT = AVT.

Further, when checking the total amount Dc at the time of calibration, the external measuring instrument 47 is connected online, so that manual intervention can be eliminated, automation can be achieved, and erroneous operation can be eliminated.

Second Embodiment As shown in FIG. 4, the present embodiment is configured substantially in the same manner as the above-described first embodiment, but the calibration means 40 of the infusion control device 30 does not automatically confirm the completion of calibration but manually operates. The difference is that the measurement is not the time t but the movement distance s.

That is, the calibration end confirmation unit 44A of the present embodiment is an externally operable switch or the like, and a general measuring cylinder is used as the weighing device 47A. The liquid level is monitored, and when the liquid amount d reaches a predetermined total amount Dc, a switch is operated to output an end signal STP.

Further, the variable measuring unit 45A of the present embodiment is
The control pulse from the controller to the motor 15 is monitored, whereby the movement distance s = Sc during the calibration operation is measured.

Along with this, the processing contents of the constant calculation unit 46A also differ, and the constant calculation unit 46A calculates the cross-sectional area A = Dc / Sc from the set total amount Dc and the measured moving distance Sc.

In this embodiment, a calibration operation is performed and then a normal infusion operation is performed in substantially the same manner as in the first embodiment.

As shown in FIG. 5, the infusion control device 30 enters the calibration operation mode by operating the calibration switch 42 (process C20). The calibration operation control unit 41 includes a calibration condition storage unit 43
, The variable amount measurement unit 45A is reset to start measuring the moving distance s (processing C22), and the main control unit 33 operates the motor 15 at the speed Vc (processing C23). ). As a result, the liquid is sent out from the syringe 20, and the amount is sequentially measured by the measuring unit 47A. The operator monitors the current liquid amount d (process C24), and when d ≧ Dc, the calibration end confirmation unit 44A is operated to stop the measurement of the moving distance s (processing C25), and the motor 15A is operated.
Is stopped (process C26). Calibration operation controller 4
1 sends the measured distance s = Sc and the total amount Dc to the constant calculator 46, where the cross-sectional area A = Dc / Sc is calculated (process C27),
This value A is stored in the operating condition storage unit 36 (process C2
8). Note that the normal operation following the calibration operation is one in which the same processes S10 to S17 as those in the first embodiment are sequentially performed, and a description thereof will be omitted.

According to this embodiment as well, the cross-sectional area A of the syringe 20 to be used can be actually measured by the calibration operation for actually infusing a constant amount, and substantially the same effect as in the first embodiment can be obtained.

Further, the travel distance s of the syringe 20 is measured, and the sectional area A
Is calculated, the calibration accuracy can be further improved.

Further, since the measuring cylinder 47A is used for the measuring device 47A for confirming a certain amount of infusion, automation cannot be performed, but the solution can be directly measured and the certain amount can be easily confirmed. In particular, if you set the total amount Dc according to the scale,
Sufficient accuracy can be obtained by visual inspection of the operator.

Third Embodiment As shown in FIG. 6, the present embodiment is configured substantially in the same manner as the above-described first embodiment, but the calibration means 40 of the infusion control device 30 uses the time t for confirming the completion of calibration, Infusion volume d
This is different from the first and second embodiments in that a system for measuring the amount of infusion over a certain period of time is used, whereas the first and second embodiments use a constant amount of infusion system.

That is, the calibration end confirmation unit 44B of the present embodiment is connected to the clock timer 35, monitors the time t, and outputs the stop signal STP when the predetermined time Tc has elapsed.

The fixed time Tc is set in the calibration condition storage unit 43 in advance, and is transferred when the calibration operation control unit 41 is activated.

Further, the variable measuring section 45B of the present embodiment is connected to the measuring device 47 similar to that of the first embodiment, and the cylinder 20 is operated during the calibration operation.
The liquid amount d sent from is measured.

In this embodiment, a calibration operation is performed and then a normal infusion operation is performed in substantially the same manner as in the above-described embodiments.

As shown in FIG. 7, the infusion control device 30 enters the calibration operation mode by operating the calibration switch 42 (process C30). The calibration operation control unit 41 includes a calibration condition storage unit 43
, The time Tc and the speed Vc are read (process C31), the respective values are set in the main control unit 33 and the calibration end confirming unit 44B, and the variable measuring unit 45B and the scale 47 are reset (process C3).
2). Then, the clock end is checked by the calibration end confirmation unit 44B.
At the same time, the timer is started by using the motor 35 (process C33), and the main controller 33 operates the motor 15 at the speed Vc (process C3)
4), whereby the liquid is delivered from the syringe 20.
The calibration end confirmation unit 44B successively compares the current time t with the previously set time Tc (process C35), repeats the operation during t <Tc, and continues the motor 15 when t ≧ Tc. Is stopped (process C36). The variable measuring unit 45B reads the liquid amount d = Dc measured by the measuring device 47 after waiting for a period of time such that the infusion from the syringe 20 completely runs out (process C37). The calibration operation control unit 41 includes a measured liquid amount Dc, a time Tc, and a speed Vc.
To the constant calculation unit 46, where the cross-sectional area A = Dc / (TcVc)
Is calculated (process C38), and this value A is stored in the operating condition storage unit 36.
(Process C39). Note that the normal operation following the calibration operation is one in which the same processes S10 to S17 as those in the first embodiment are sequentially performed, and a description thereof will be omitted.

According to this embodiment as well, the cross-sectional area A of the syringe 20 to be used can be actually measured by the calibration operation for actually performing an infusion, and the same effect as in the first embodiment can be obtained.

Also, the infusion operation is performed for a certain period of time Tc and automatically stopped,
Since the fluid volume Dc is measured after the infusion from the syringe 20 has expired, the fluid volume Dc sent out by the syringe 20 can be measured more accurately, the accuracy of the set cross-sectional area A can be increased, and calibration can be performed. The infusion accuracy in the normal operation following the operation can be further enhanced.

Fourth Embodiment As shown in FIG. 8, the present embodiment is configured substantially in the same manner as the third embodiment described above, but the calibration means 40 of the infusion control device 30 determines that calibration has been completed after a certain period of time. The difference is that a certain distance is detected without moving.

That is, the calibration end confirmation unit 44C of the present embodiment monitors the control pulse from the motor driver 32 to the motor 15, and outputs a stop signal STP when the movement distance s during the calibration operation reaches a certain distance Sc. It is supposed to.

Note that the constant calculation unit 46A is the same as that of the second embodiment, and the cross-sectional area A =
Calculate Dc / Sc.

As shown in FIG. 9, the infusion control device 30 enters the calibration operation mode by operating the calibration switch 42 (process C40). The calibration operation control unit 41 includes a calibration condition storage unit 43
, The distance Sc and the speed Vc are read from the CPU (process C41), the values are set in the main control unit 33 and the calibration end check unit 44C, and the variable measuring unit 45B and the scale 47 are reset (process C4).
2). Then, the monitoring of the movement distance s is started by the calibration end confirmation unit 44B (process C43), and the motor 15 is operated at the speed Vc by the main control unit 33 (process C44), whereby the liquid is sent out from the syringe 20. You. Calibration end confirmation section 44
C successively compares the current moving distance s with the previously set distance Sc (process C45), repeats the operation while s <Sc, and advances the motor 15 when s ≧ Sc. Stop (process C36). The variable measuring unit 45B reads the liquid amount d = Dc measured by the measuring device 47 after waiting for a period of time when the infusion from the syringe 20 completely runs out (process C47). The calibration operation control unit 41 calculates the measured liquid amount Dc and the movement distance Sc by a constant calculation unit 46.
A, where the cross-sectional area A = Dc / Sc is calculated (process C4
8) Then, this value A is stored in the operating condition storage unit 36 (Process C)
49). Note that the normal operation following the calibration operation is one in which the same processes S10 to S17 as those in the first embodiment are sequentially performed, and a description thereof will be omitted.

According to this embodiment as well, the cross-sectional area A of the syringe 20 to be used can be actually measured by the calibration operation for actually performing an infusion, and the same effects as those of the above embodiments can be obtained.

In addition, the syringe 20 for a certain distance Sc during the infusion operation
To stop the infusion from the syringe 20 after the automatic stop, and then measure the liquid amount Dc, so that the liquid amount Dc sent out by the syringe 20 can be measured more accurately, and the moving distance Sc Is clear, the accuracy of the set cross-sectional area A can be increased, and the infusion accuracy in the normal operation following the calibration operation can be further increased.

The present invention is not limited to the above embodiments, but includes the following modifications.

That is, the mechanical or circuit configuration of the infusion control device 30 may be appropriately selected, and the operation control means 31 and the calibration means 40 may be selected.
May be appropriately selected for implementation.

Further, the means for measuring or monitoring the liquid amount at the time of the calibration means is not limited to the method of calculating the liquid amount from the weight w as in each of the above embodiments and the method of visually checking the liquid level using a measuring cylinder, An appropriate format may be adopted.

For example, a light-emitting device and a light-receiving device may be arranged on both sides of a measuring cylinder or the like, and a beam of light or the like may be stretched across the measuring cylinder or the like to monitor passage of the liquid surface. Monitoring can be automated. Alternatively, a ribbon-shaped sensor for detecting liquid contact may be arranged vertically on the inner circumference of a container such as a measuring cylinder, and the level of the liquid may be monitored by sensor output. Automation is possible while measuring.

Further, in each of the above embodiments, as the calibration operation, the infusion amount Dc was measured by the measuring device 47 or the like, but the flow rate Fc was measured using a flow meter or the like.
May be measured. In this case, the section constant A is A = Fc / Vc
From the relationship.

Further, the speed Vc at the time of performing the calibration operation is arbitrary, and may be appropriately set in practice. However, if the speed Vc is too high, it may be difficult to accurately confirm the liquid amount particularly when the calibration operation is completed by detecting a constant amount as in the first and second embodiments, and the speed may be too low. Then, it takes a long time for the calibration operation, so it is desirable to set the speed to an appropriate speed.

In the normal infusion operation, the elapsed time t is monitored in the above-described embodiment, and the drive of the motor 15 is continued to inject the entire amount Do, but the stroke S in the motor driver 32 may be monitored.

Further, the total amount Do and the flow rate Fo are specified as the infusion conditions, but as is clear from the relationship Do = Fo × To, the total amount Do and the operation time To or the operation time To and the flow rate Fo may be specified.

On the other hand, the control target of the infusion control device 30 according to the present invention is not limited to the infusion pump 10 using the cylinder 20, but a tube-type infusion pump as shown in FIG. 10 or FIG.
It may be 50,60.

In FIG. 10, the infusion pump 50 has an arc-shaped guide surface 51.
, A plurality of rollers 53 are arranged on the outer periphery of the rotating portion 52, and a flexible infusion tube 54 is sandwiched between each roller 53 and the guide surface 51. . The rotating part 52 is driven to rotate by a motor 55, and sequentially handles the tube 54 with each roller 53 according to the rotation, so that the liquid supplied from the upstream side of the tube 54 is infused downstream according to the rotation speed. I have.

In such an infusion pump 50, there is an individual difference such as a manufacturing error in the effective cross-sectional area of the tube 54, and the effective cross-sectional area is different from an initial value due to a time change due to use. However, by adopting the infusion control device 30 similar to each of the above embodiments, the calibration operation is performed prior to the normal infusion operation, the section coefficient A corresponding to the current effective area of the tube 54 is determined, and the normal operation is performed. At this time, by controlling the operation of the motor 55 based on the section coefficient A, accurate infusion can be performed. Note that an encoder 56 for monitoring rotation may be provided in the motor 55, and the output thereof may be returned to the infusion control device 30 to perform closed-loop control.

In FIG. 11, the infusion pump 60 has fingers 62 that can move back and forth toward a flat guide surface 61, and a flexible infusion tube 54 is sandwiched between each finger 62 and the guide surface 61. . Each finger 62 is connected to a motor 64 via a cam mechanism 63.
, And can be pressed against the guide surface 61. Each finger 62 introduces the liquid supplied from the upstream of the tube 54 by opening the upstream finger 62A and the central measuring finger 62B with the downstream finger 62C closed, and closes the upstream finger 62A to close the downstream finger. The tube 54 is crushed by pushing the measuring finger 62B after opening the opening 62C, and the liquid introduced earlier is pressure-fed to the downstream side. The amount of infusion liquid for each cycle can be adjusted by limiting the stroke of the measuring finger 62B with the motor 65,
66 enables the operation cycle to be detected.

In such an infusion pump 60, the infusion control device 30
By performing the calibration operation, the calibration operation is performed prior to the normal infusion operation, and the sectional coefficient A corresponding to the effective sectional area associated with the current crushing operation of the tube 54 is determined. By controlling the operation of the motor 55 in this way, accurate infusion can be performed. On this occasion,
In the calibration calculation, the operation cycle time, the interval between the upstream and downstream fingers 62A and 62C, the pushing stroke of the measuring finger 62B, and the like are appropriately referred to, and the deformation state at the time of crushing due to the change in the flexibility of the tube 54, etc. It is desirable to set so that calibration including the above can be performed.

Further, the infusion control device 30 according to the present invention is not limited to the above-described cylinder-type or tube-type infusion pumps 10, 50, and 60, and may be applied to existing diaphragm-type infusion pumps. The same application as that of the infusion pump 60 is possible.

〔The invention's effect〕

As described above, according to the present invention, a calibration operation using an actually used infusion pump is performed to set an operation constant, and an operation according to an infusion condition given based on the operation constant is performed. The infusion pump can be operated by the setting, and an accurate infusion operation corresponding to the given infusion condition can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a controlled object of a first embodiment of the present invention,
FIG. 2 is a block diagram showing a control device of the first embodiment, and FIG.
FIG. 4 is a flowchart showing a control procedure of the first embodiment, FIG. 4 is a block diagram showing a control device of the second embodiment, FIG. 5 is a flowchart showing a control procedure of the second embodiment, and FIG. FIG. 7 is a block diagram showing a control device of the third embodiment, FIG. 8 is a block diagram showing a control device of the fourth embodiment, FIG. 9 is a block diagram showing a control device of the fourth embodiment. FIG. 10 is a flowchart showing a control procedure of the embodiment, FIG. 10 is a schematic diagram showing another control object of the present invention, and FIG. 11 is a schematic sectional view showing another control object of the present invention. 10: infusion pump, 20: syringe, 30: infusion control device, 31: operation control means, 40: calibration means, 41: calibration operation control unit, 43: calibration condition storage unit, 44 ... Calibration completion confirmation section, 45 …… Variable measurement section, 50, 60 …… Infusion pump, 54…
…tube.

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A61M 5/00, 5/142

Claims (3)

(57) [Claims] 1. An infusion pump having operation control means for operating an infusion pump under designated infusion conditions, and calibration means for calibrating the infusion state of the infusion pump, wherein the calibration means calibrates the infusion pump under predetermined calibration conditions. A calibration operation control unit to be operated, a calibration end confirmation unit that ends the calibration operation when a predetermined stop state is detected, a variable measurement unit that measures a predetermined variable related to the infusion state when the calibration operation is completed, and measurement. A constant setting unit for setting an operation constant relating to the infusion pump to the operation control means based on the set variables. 2. The apparatus according to claim 1, wherein the calibration completion confirmation unit detects that the infusion amount by the calibration operation has reached a predetermined value, and the variable measurement unit has a moving distance or a moving amount of the calibration operation. An infusion control device for measuring time. 3. The method according to claim 1, wherein the calibration completion confirmation unit detects that the calibration operation has elapsed for a predetermined time or has moved by a predetermined distance, and the variable measurement unit measures the infusion amount by the calibration operation. An infusion control device for measuring.