JP2005131078A - Liquid carrying system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid carrying system in which safety in the case that air bubbles are present is improved further without the need of complicated procedures. <P>SOLUTION: This liquid carrying system (transfusion line system) 1 is provided with a deaerator 12 which removes the air bubbles from liquid to be injected to a human body beforehand, an air bubble detector 131 which detects the air bubbles precipitated from the liquid in a liquid carrying circuit, and a control part 120 which controls a deaerating operation in the deaerator 12 on the basis of the detected result of the air bubbles by the air bubble detector 131. In this case, in the liquid carrying system relating to this invention, the air bubble detector 131 detects the air bubbles at a position on the downstream side of the deaerator 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid transport system including a liquid feed line connected to a needle placed in a blood vessel, and in particular, in a medical circuit, a liquid transport system capable of controlling the amount of bubbles in the liquid to be fed. About.

  In order to check and control the liquid delivery state in a liquid conveyance circuit to the outside of the body such as infusion, blood transfusion, or extracorporeal circulation, a component called a drip tube that separates the liquid reservoir from the gas layer is used. It is done. The liquid feeding state is confirmed or controlled by dropping a liquid droplet from the outlet in the gas layer portion above the drip tube onto the liquid surface below the drip tube. However, in such a form, the liquid droplet directly drops on the liquid surface, and at that time, the gas in the gas layer is entrained in the liquid in the liquid reservoir. Therefore, there is a problem that the dissolved gas in the liquid in the liquid transport circuit increases and the dissolved gas precipitates in the circuit as bubbles over time due to an increase in the environmental temperature during liquid feeding.

As a method for avoiding the entrainment of gas in such a drip tube, there has heretofore been devised to prevent the liquid droplet from directly falling on the liquid surface (see, for example, Patent Documents 1 and 2). According to this prior art, the liquid droplets flow into the liquid along the inner wall surface of the drip tube, and the entrainment of gas is suppressed.
Japanese Patent Application No. 4-55928 (Page 1, Fig. 1) JP-A-60-116369 (first page, FIG. 1)

  However, even if the entrainment of air bubbles is eliminated by the drip tube as described above, and even when there is no drip tube in the liquid transport circuit, the amount of dissolved oxygen fluctuates with changes in the environmental temperature, and the air bubbles are contained in the circuit. May adhere to the wall. There is no problem with such bubbles entering the human body in the same size, but it seems that the influence of the bubbles on the human body is great when the bubbles gather to form large bubbles. Therefore, when such a bubble is detected by the bubble detector, the pump operation of the liquid feeding pump is generally stopped to stop the liquid feeding. Thus, the device (safety consideration) which prevents the harm to a human body beforehand is made | formed. However, since it is not always compensated that there is no malfunction in the bubble detector, it is desired to further improve safety so that bubbles in the liquid transport circuit do not exist. In spite of this, conventionally, if the pump is stopped or the structure of the drip tube is changed, if the circuit is clogged with bubbles, the nurse will tap the circuit to remove the bubbles. It was necessary to take measures such as taking care of them, and it took time and effort.

  Accordingly, an object of the present invention is to provide a liquid transport system that further enhances safety when bubbles are present without requiring a complicated procedure.

In order to solve the above-described problems, in the liquid transport system according to the present invention, a deaeration device that previously removes bubbles from the liquid injected into the human body, and a bubble detection that detects bubbles deposited from the liquid in the liquid transport circuit And a control means for controlling a deaeration operation in the deaeration device based on a bubble detection result by the bubble detection means.
Thereby, deaeration is possible and the influence on the liquid feeding speed can be reduced. As a result, it is possible to further improve the safety when bubbles are present without requiring a complicated treatment.

Here, in the liquid transport system according to the present invention, the bubble detection means may detect bubbles at a position downstream of the deaeration device.
Thereby, the deaeration operation in the deaeration device can be efficiently controlled.

Further, in the liquid transport system according to the present invention, the deaeration device includes a deaeration element connected in the middle of the liquid transport circuit, and a decompression unit that decompresses the air pressure around the deaeration element. The control means causes the pressure reducing means to perform a pressure reducing operation of the ambient pressure around the deaeration element when the bubble detecting means detects a predetermined amount of bubbles exceeding a predetermined first threshold value. It may be a feature.
As a result, when the bubble detecting means detects, for example, a bubble having a diameter of more than 3 mm, the bubble can be degassed, and there is a risk of harming the human body (for example, the length in the infusion line). Can be degassed before growing.

Further, in the liquid transport system according to the present invention, the control unit may reduce the pressure when the bubble detection unit detects a predetermined amount of bubbles less than a second threshold value that is lower than the first threshold value. The depressurization operation of the atmospheric pressure around the deaeration element by means may be stopped.
As a result, when the bubble detection means detects a bubble having a diameter of less than 1 mm, for example, the deaeration of the bubble can be stopped, and efficient deaeration control can be performed.

Further, in the liquid transfer system according to the present invention, the control means stops the pressure reducing operation after a predetermined time has elapsed since the pressure reducing means performs the pressure reducing operation of the deaeration element ambient pressure. It can also be.
As a result, for example, deaeration of the bubbles can be stopped after the bubbles become less than 1 mm in diameter, and efficient deaeration control can be performed.

Moreover, in the liquid conveyance system according to the present invention, the liquid conveyance system further detects a temperature of the infusion heated by the heating means and a heating means for heating the infusion flowing into the deaeration element. Temperature detecting means, and the control means may control a heating operation by the heating means based on a detection result of the infusion temperature by the temperature detection.
This makes it easier for gas to escape from the infusion when heated, reducing the effect on the infusion rate, and allowing the infusion to reach the same temperature as the human body, reducing the load on the human body. it can.
In the liquid transfer system according to the present invention, the control unit stops the heating operation by the heating unit when the temperature detecting unit detects a temperature exceeding a predetermined third threshold value. It can also be made to feature.
Accordingly, when the temperature detecting means detects a temperature exceeding 37 ° C., for example, the heating can be stopped, and the heating can be stopped before the infusion solution reaches a temperature higher than the human body.

Further, the control means causes the infusion solution to be warmed by the warming means when the temperature detection means detects a temperature lower than the fourth threshold value and lower than the fourth threshold value. It can be.
Thus, when the temperature detecting means detects a temperature of, for example, less than 36 ° C., heating can be started, and heating can be performed before the infusion solution reaches a temperature lower than that of the human body.

  As is clear from the above description, according to the liquid transport system of the present invention, the deaeration operation in the deaeration device is controlled based on the detection result of the bubbles by the bubble detection means, so that deaeration is possible. In addition, the influence on the liquid feeding speed can be reduced. As a result, it is possible to further improve the safety when bubbles are present without requiring a complicated treatment.

  Therefore, according to the present invention, the safety of medical treatment is enhanced, and the practical value of the present invention of the present application in which the liquid transport system has become widespread is extremely high.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings using an infusion line as an example.
(Embodiment 1)
FIG. 1 is a block diagram showing an overall configuration of an infusion line system 1 in the present embodiment.

FIG. 1 is a block diagram showing a configuration of an infusion line system 1 of the present embodiment.
As shown in FIG. 1, the infusion line system 1 includes an infusion bag 11, an infusion set 10, a deaeration device 12, an infusion pump 13, and the like.
The infusion bag 11 stores the infusion solution. The infusion set 10 is formed of a transparent synthetic resin infusion tube 15 and a flexible transparent resin in addition to the infusion introduction needle and the vein needle, and connects the infusion introduction needle, the infusion tube 15 and the vein needle. Tube-like infusion lines 14, 16, and 17, and a tubular deaeration element 123 (see FIGS. 2 and 3) that is airtightly connected to any part of the infusion lines 14, 16, and 17. Composed. The deaeration device 12 is equipped with a deaeration element 123 and degass the gas such as air and oxygen contained in the infusion solution. The deaeration element 123 is formed of a resin having porosity and water repellency (for example, a porous hollow tube made of a fluororesin such as polytetrafluoroethylene), and selectively allows a gas present in the liquid to permeate. It has a function. One of the infusion lines 14, 16, and 17 is attached to the infusion pump 13, and the infusion solution is delivered from the infusion bag 11 side to the human body by a predetermined amount.

Next, the configuration of the deaeration device 12 will be described.
FIG. 2 is a diagram showing an external configuration of the deaeration device 12, and FIG. 3 is a diagram showing an internal configuration of the deaeration device 12.
As shown in these drawings, the deaeration device 12 includes a housing 121 having an opening / closing door 122 supported so as to be opened and closed around a predetermined axis of the housing 121. In the housing 121, tube holders 126 and 127 for fixing both ends of the deaeration element 123 that is airtightly connected to the infusion lines 14 and 16 when the open / close door 122 is opened, and the infusion flowing through the deaeration element 123. Formed by a housing 121 and an opening / closing door 122 when the opening / closing door 122 is closed, a hot plate type heater 125 for heating the temperature, a temperature detection sensor 124 for detecting the temperature of the infusion flowing through the deaeration element 123. A vacuum pump 128 for depressurizing the inside of the room and a control unit 120 for driving and controlling the vacuum pump 128 and the heater 125 are provided.

  According to such a configuration, when the open / close door 122 is opened, both ends of the deaeration element 123 are pushed into the tube holders 126 and 127, respectively, and the deaeration element 123 is meandered while being in contact with the temperature detection sensor 124 and the heater 125. The deaeration element 123 can be securely attached to the deaeration device 12 simply by closing the open / close door 122. That is, the ease of mounting can be realized. Moreover, since the deaeration element 123 is connected to the infusion line in an airtight manner, these sterilization properties can be enhanced.

  In order to bring the deaeration element 123 into contact with the temperature detection sensor 124 and the heater 125, the temperature detection sensor 124 and the temperature detection sensor 124 may be formed in a holder shape, and a pressing member is provided on the open / close door 122. The deaeration element 123 may be configured to contact the temperature detection sensor 124 and the heater 125. Further, deaeration control and the like by the control unit 120 will be described later. Furthermore, although the deaeration element 123 is formed in a tubular shape here, it is not limited to a tubular shape as long as it has a function of selectively permeating the gas present in the liquid, and other shapes such as a membrane shape, a bag shape, etc. It may be.

Next, the configuration of the infusion pump 13 will be described.
FIG. 4 is a diagram showing the configuration of the infusion pump 13.
As shown in FIG. 4, the infusion pump 13 includes a bubble detector 131, a finger part 132, a tube closing part 133, a pair of tube holders 134 and 135 that hold the tube, and a touch panel display part 136. Yes. Further, a guide member 137 for guiding and holding the infusion line and a pressing member 138 for pressing the infusion line against the finger portion 132 to obtain a pump function are provided on the inner surface of the door of the infusion pump 13. Is provided. The bubble detector 131 includes, for example, a transmitting element that generates an ultrasonic wave toward the tube and a receiving element that is disposed along the tube and receives the ultrasonic wave through the tube. Can be accurately detected including its size. In addition, here, a configuration is shown in which the infusion liquid is supplied by a predetermined amount with the finger portion 132 sandwiching the infusion tube, but the infusion solution may be supplied by a predetermined amount by squeezing the infusion tube with a roller or the like. Good.

  According to such a configuration, the infusion line is pushed into the long groove tube holder 134, the infusion line is straightly extended while being pushed straight into the long groove tube holder 135, the door is closed, and the infusion line is moved to the finger portion 132. Can be securely attached. Then, when the door is closed, the power switch is turned on, the desired amount of infusion is set by operating the touch panel, and the start of the infusion is instructed, the control unit (not shown) performs the pressure closing operation of the tube by the fingers of the finger portion 132. Control sequentially. As a result, the transfusion in the tube is fed to the human body by a predetermined amount.

  When the liquid feeding is started, the control unit acquires the presence / absence of bubbles in the infusion including the size thereof from the ultrasonic reception level of the receiving element of the bubble detector 131. When the bubble size (length in the line) becomes 5 mm or more, the control unit stops the tube closing operation by the finger of the finger unit 132 and drives the tube blocking unit 133 to block the infusion line. Stop feeding. This reliably prevents the injection of “5 (+1, −0) mm” bubbles, which are defined by JIS standards and are dangerous to the human body. In addition, if a control part acquires the presence or absence of the bubble in infusion including the magnitude | size from the ultrasonic reception level of the receiving element of the bubble detector 131, the acquisition result will be transmitted to the control part 120 of the deaeration apparatus 12. To do.

Next, the deaeration control by the control unit 120 will be described.
As shown in FIG. 5, the control unit 120 has, for example, a plurality of input ports and an output port for driving a heater and a vacuum pump, a ROM for storing a program in advance therein, a RAM for providing a work area, This is a one-chip microcomputer having a timer for measuring time, a CPU for executing a program, and the like. In addition, although the control part 120 can also perform temperature control and deaeration control in parallel, the case where only deaeration control is performed is demonstrated here.

FIG. 6 is a flowchart showing a deaeration control operation performed by the control unit 120.
The control unit 120 sets “0” (stop evacuation stop) to the evacuation flag indicating whether or not to evacuate (S60), and inputs the bubble data received from the controller of the infusion pump 13 ( S61) Whether or not the bubble size exceeds a predetermined first threshold value Th1 (the length at the pump bubble detector 131 varies depending on the inner diameter of the infusion line, for example, a diameter of 3 mm). Judgment is made (S62).

  When the bubble size is equal to or smaller than the first threshold value Th1 (no in S62), the control unit 120 determines whether the bubble size is less than a second threshold value Th2 (for example, a diameter of 1 mm) ( S65). As a result of the determination, when the size of the bubble is less than the second threshold Th2 (Yes in S65), the control unit 120 determines whether or not the vacuum pump 128 is ON (degassed) (S66). This determination is made based on whether the value of the deaeration flag indicating ON / OFF of the vacuum pump 128 provided in the work area of the RAM is “1” (ON) or “0” (OFF), for example. If the result of this determination is that the vacuum pump 128 is ON (degassing) (yes in S66), the control unit 120 turns off the vacuum pump 128 and resets the degassing flag to “0” (S67). The process returns to the bubble data input process (S61). When the vacuum pump 128 is not ON (degassed) (no in S66), the control unit 120 continues to stop degassing (S67b) and returns to the bubble data input process (S61). As a result, the air pressure around the deaeration element 123 increases, the deaeration by the deaeration element 123 is stopped, and bubbles grow.

  As a result of the determination, if the size of the bubble is not less than the second threshold Th2 (no in S65), that is, the size of the bubble is not less than the second threshold Th2 and not more than the first threshold Th1. In this case, the control unit 120 determines whether or not the evacuation flag is “0” (S68). As a result of the determination, if the follow-up deaeration flag is “0” (yes in S68), the control unit 120 continues the deaeration stop (S69) and returns to the bubble data input process (S61). As a result, the air pressure around the deaeration element 123 is increased, the deaeration by the deaeration element 123 is stopped, and the bubbles further grow.

  When the bubble size exceeds the first threshold Th1 (Yes in S62), the control unit 120 determines whether or not the vacuum pump 128 is ON (degassed) (S63). This determination is made according to whether the value of the deaeration flag is “1” (ON) or “0” (OFF), similarly to the determination in step S66. As a result of the determination, if the vacuum pump 128 is not turned on (degassed) (no in S63), the control unit 120 turns on the vacuum pump 128, sets "1" in the degas flag, and sets the follow degas flag. “1” is set (S64a), and the process returns to the bubble data input process (S61). If the vacuum pump 128 is ON (degassed) (yes in S63), the control unit 120 continues degassing by the vacuum pump 128 (S64b), and returns to the bubble data input process (S61). As a result, the deaeration by the deaeration element 123 is continued, the pressure around the deaeration element 123 is lowered, and the bubble diameter becomes smaller than 3 mm.

  If the bubble size is 1 mm or more and 3 mm or less (no in S62 and S65) and the evacuation flag is not “0” (no in S68), that is, if the evacuation flag is “1”, control is performed. The unit 120 continues the deaeration operation (S70), resets the follow-up deaeration flag to “0” (S71), and returns to the bubble data input process (S61). Thereby, the magnitude | size of a bubble will fall to 1 mm.

And the control part 120 performs the hysteresis operation which repeats deaeration stop until the magnitude | size of a bubble will be 3 mm and deaeration until it becomes 1 mm alternately.
By such treatment, the size of the bubbles is reliably maintained at 3 mm or less.
In the first embodiment, the first threshold value Th1 is 3 mm in diameter and the second threshold value Th2 is 1 mm in diameter. However, this value is an example, and other values may be used.

  Further, in the infusion pump 13, when the size of the air bubble is 5 mm or more, the control unit stops the tube crushing operation by the fingers of the finger unit 132 and drives the tube closing unit 133 to close the infusion line. Although the liquid feeding is stopped, the liquid feeding line may be closed by closing the infusion line when the size of the bubbles is less than 5 mm. In this case, the first threshold value Th1 and the second threshold value Th2 may be determined according to a value less than 5 mm.

(Embodiment 2)
By the way, in the infusion line system 1 which concerns on the said Embodiment 1, the deaeration apparatus 12 and the infusion pump 13 were separate structures. According to such a structure, an apparatus will enlarge.
Therefore, in the infusion line system according to Embodiment 2, the deaerator 12a and the infusion pump 13a are integrated as shown in FIG. Such integration is realized, for example, by providing a deaeration device above the infusion pump.

  If the deaeration device 12a and the infusion pump 13a are integrated in this way, it is possible to easily eliminate the need for lead wires between the devices in addition to the common housing and the common control unit. Can be miniaturized.

(Embodiment 3)
By the way, in the infusion line system 1 which concerns on the said Embodiment 1, the deaeration element 123 was one tube structure. According to such a configuration, the contact area between the tube and the infusion solution is reduced, and the deaeration efficiency is reduced.

Therefore, the deaeration element 123 according to the third embodiment is configured by a bundle of hollow fibers having porosity.
The configuration of one embodiment of the deaeration element 123 of the present invention is shown in FIG.
As shown in the figure, the deaeration element 123 generally includes a plurality of (for example, 3000 to 15000) hollow fibers 86, a holder 87 for bundling the plurality of hollow fibers 86, and a pair connected to the holder 87. Header 83, 84, a cylindrical housing 85, a cap 87 for connecting the holder 87 and the headers 83, 84 in a fluid-tight manner, and the like.

An infusion port protrudes from the top of the header 83, and a blood outlet protrudes from the top of the header 84. In addition, a deaeration port 82 is protruded from the side of the cylindrical housing 85.
The hollow fiber 86 is formed in a macaroni shape having an inner diameter of around 200 μm and an outer diameter of around 250 μm. As the hollow fiber 86, for example, a polyolefin such as polymethyl methacrylate, polyethylene, polypropylene, polysulfone, polyacrylonitrile, polyamide, polyimide, polyether polyamide, silicone, polytetrafluoroethylene, polyester polymer alloy, etc. is porous. That are configured to have The method for producing the hollow fiber membrane that can be used in the present invention is not particularly limited, but a synthetic resin having high water repellency is preferable.

According to the deaeration element 123 configured in this way, when gas is contained in the infusion flowing through the hollow fiber 86 from the header 83 toward the header 84, the deaeration port 82 is connected to the vacuum pump 128, and the vacuum is supplied. By driving the pump 128 to depressurize the inside of the cylindrical housing 85, the surface area of the hollow fiber 86 is very large, so that the gas can be efficiently degassed.
Further, it is not necessary to make the inside of the housing airtight, and the door can be simplified.

(Embodiment 4)
By the way, in the infusion line system 1 which concerns on the said Embodiment 1, the control part 120 was comprised so that temperature control of a bubble might not be performed. On the other hand, in the infusion line system according to the fourth embodiment, the control unit 120 is different in that it is configured to perform temperature control.

FIG. 9 is a flowchart showing a deaeration control operation executed by the control unit 120.
The control unit 120 sets “1” (additional heating) to the additional heating flag indicating whether additional heating is performed (S90), and measures the infusion temperature T flowing through the deaeration element 123 by the temperature detection sensor 124. Then, it is determined whether or not the infusion temperature T exceeds 37 ° C. (S92).

  When the infusion temperature T is 37 ° C. or lower (no in S92), the control unit 120 determines whether the infusion temperature T is lower than 36 ° C. (S95). As a result of the determination, when the infusion temperature T is less than 36 ° C. (yes in S95), the control unit 120 determines whether or not the heater 125 is OFF (warming stop) (S96). This determination is made based on whether the value of the heater flag indicating ON / OFF of the heater 125 provided in the work area of the RAM is “1” (ON) or “0” (OFF), for example. As a result of the determination, when the heater 125 is OFF (warming stop) (Yes in S96), the control unit 120 turns on the heater 125 and sets the heater flag to “1” (S97a), and the infusion temperature. The process returns to the T measurement process (S91). If the heater 125 is not OFF (warming stop) (No in S96), the control unit 120 continues the heating by the heater 125 as it is (S97b) and returns to the infusion temperature T measurement process (S91). As a result, the infusion temperature rises to 36 ° C.

  When the infusion temperature T is not lower than 36 ° C. and not higher than 37 ° C. (No in S92 and S95), the control unit 120 determines whether or not the additional heating flag is “1” (S98). As a result of the determination, when the additional heating flag is “1” (Yes in S98), the control unit 120 continues the heating by the heater 125 (S99a), and returns to the infusion temperature T measurement process (S91). As a result, the infusion temperature rises to 37 ° C.

  When the infusion temperature T exceeds 37 ° C. (Yes in S92), the control unit 120 determines whether or not the heater 125 is ON (warming) (S93). This determination is made according to whether the value of the heater flag is “1” (ON) or “0”, similar to the determination in step S96. As a result of the determination, if the heater 125 is ON (warming) (yes in S93), the control unit 120 turns off the driving of the heater 125, resets the heater flag to “0”, and sets the additional warming flag. It resets to “0” and returns to the infusion temperature T measurement process (S91). If the heater 125 is not ON (warming) (no in S93), the control unit 120 continues the warming stop (S94b) and returns to the infusion temperature T measurement process (S91). As a result, the infusion temperature is lowered from 37 ° C.

  When the infusion temperature T is 36 ° C. or higher and 37 ° C. or lower (no in S92 and S95) and the additional heating flag is not “1” (no in S98), that is, the additional heating flag is “0”. In this case, the control unit 120 continues to stop heating (S99b), sets the additional heating flag to “1” (S99c), and returns to the infusion temperature T measurement process (S91). As a result, the infusion temperature is lowered to 36 ° C.

Then, the control unit 120 executes a hysteresis operation that alternately repeats the heating up to 37 ° C. and the heating stop up to 36 ° C.
By such treatment, the infusion solution is maintained at a temperature of 36 ° C. to 37 ° C. which is the same as the temperature of the human body. Thereby, when the infusion solution is cold, bubbles are easily generated by heating. Therefore, there is an effect that the deaeration efficiency is dramatically increased. Moreover, the flow rate accuracy of the infusion is increased. Moreover, since the infusion solution is maintained at the same temperature as the human body, the load on the human body is reduced.

In this embodiment, it is determined whether or not the heater 125 is turned on (warming) based on the value of the temperature flag. However, the heater 125 is turned on (warmed) based on the value of the output port that drives the heater 125. It may be determined whether or not.
In this embodiment, the threshold values are set to 37 ° C. and 36 ° C., but these values are merely examples, and other values may be used as the threshold values.

(Embodiment 5)
By the way, in the infusion line system 1 according to the first embodiment, the control unit 120 is configured to perform deaeration control with two threshold values.
In contrast, the infusion line system according to the fourth embodiment is different in that the control unit 120 is configured to perform deaeration control with one threshold value and a timer.

FIG. 10 is a flowchart showing a deaeration control operation performed by the control unit 120.
The control unit 120 inputs the bubble data received from the control unit of the infusion pump 13 (S61), and whether or not the bubble size exceeds a predetermined first threshold value Th1 (for example, a diameter of 3 mm). Judgment is made (S62).
As a result of the determination, if the bubble size is equal to or smaller than the first threshold value Th1 (no in S62), the control unit 120 immediately returns to the bubble data input process (S61).

  On the other hand, when the bubble size exceeds the first threshold value Th1 (Yes in S62), the control unit 120 turns on the vacuum pump 128 (S64), starts the timer operation (S100), Wait for a predetermined time t1 to elapse (S101). This time t1 is determined, for example, as the time required for the size of the bubbles in the infusion to drop to a diameter of 1 mm. When the time t1 has elapsed (Yes in S101), the control unit 120 turns off the vacuum pump 128 (S102), and returns to the bubble data input process (S61). As a result, the vacuum pump 128 is driven while the time t1 elapses, and the gas is degassed due to a decrease in atmospheric pressure.

By such treatment, the size of the bubbles is kept at 3 mm or less.
In the above embodiment, the infusion line is taken as an example, but it goes without saying that the present invention can be applied to a liquid transport system that transports a liquid such as blood.

  The liquid transport system of the present invention is a liquid transport system for transporting liquid into a blood vessel, and is particularly suitable for controlling the amount of bubbles in the liquid to be transported in a medical circuit used in a medical field. ing.

It is a block diagram which shows the whole structure of the infusion line system 1 in this Embodiment 1. FIG. It is a figure which shows the external appearance structure of the deaeration apparatus. It is a figure which shows the internal structure of the deaeration apparatus. It is a figure which shows the structure of the infusion pump. It is a block diagram which shows the structure of the control part 120 vicinity. It is a flowchart which shows the deaeration control operation | movement which the control part 120 performs. It is a figure which shows the structure of the infusion line system with which deaeration apparatus 12a and infusion pump 13a were integrated. It is a figure which shows the other structural example of the deaeration element. It is a flowchart which shows the temperature control operation | movement which the control part 120 performs. It is a flowchart which shows the other deaeration control operation | movement which the control part 120 performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Infusion line system 11 Infusion bag 12 Deaeration device 13 Infusion pump 14, 16, 17 Infusion line 15 Infusion tube 120 Control part 121 Case 122 Opening / closing door 123 Deaeration element 124 Temperature detection sensor 125 Heater 126, 127 Tube holder 131 Bubble Detector

Claims (8)

A degassing device that removes bubbles from the liquid injected into the human body in advance;
Bubble detection means for detecting bubbles deposited from the liquid in the liquid transport circuit;
And a control means for controlling a deaeration operation in the deaeration device based on a bubble detection result by the bubble detection means. The liquid conveyance system according to claim 1, wherein the bubble detection unit detects bubbles at a position downstream of the deaeration device. The deaeration device includes:
A deaeration element connected in the middle of the liquid transfer circuit;
A pressure reducing means for reducing the pressure around the deaeration element,
The control means, when the bubble detecting means detects a bubble exceeding a predetermined first threshold value, causes the pressure reducing means to perform a pressure reducing operation of the atmospheric pressure around the deaeration element. Item 3. The liquid transfer system according to Item 1 or 2. The control means stops the depressurization operation of the deaeration element ambient pressure by the depressurization means when the bubble detection means detects a bubble less than a second threshold value lower than the first threshold value. The liquid transfer system according to claim 3. The liquid transport system according to claim 3, wherein the control unit stops the depressurization operation after a predetermined time has elapsed since the depressurization unit performed the depressurization operation of the atmospheric pressure around the deaeration element. The liquid transport system further includes a heating means for heating the infusion flowing into the deaeration element,
Temperature detecting means for detecting the temperature of the infusion fluid heated by the heating means,
The liquid according to any one of claims 1 to 5, wherein the control unit controls a heating operation by the heating unit based on a detection result of the infusion temperature by the temperature detection. Conveying system. The liquid according to claim 6, wherein the control unit stops a heating operation by the heating unit when the temperature detection unit detects a temperature exceeding a predetermined third threshold value. Conveying system. The control means, when the temperature detection means detects a temperature lower than a fourth threshold value that is lower than the third threshold value, causes the infusion solution to be heated by the heating means. The liquid transfer system according to claim 7.

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