JP5477788B2 - Infusion device, infusion monitoring system, and detection device - Google Patents

Description

  The present invention relates to an infusion device for injecting a drip solution such as blood or a chemical solution into a vein of a human body little by little, an infusion monitoring system for monitoring the infusion device, and a detection device that can be applied to an infusion device or the like. In particular, the present invention relates to an infusion device, an infusion monitoring system, and a detection device that can accurately detect a minute flow rate such as an infusion and can be provided at low cost.

  In recent years, a drip device for injecting a drip solution such as blood or a drug solution into a vein of a human body little by little may be provided with a sensor for detecting a flow rate of the drip solution. In such a case, it becomes possible to monitor the state of infusion using the detection result of the sensor.

  For example, Patent Documents 1 to 4 disclose conventional techniques related to sensors provided in such an infusion apparatus and related arts related to monitoring of the state of infusion.

  That is, Patent Document 1 discloses a technique for detecting the flow rate of drip liquid using a pressure sensor. Patent Document 2 discloses a technique for detecting a liquid surface position of a drip liquid using ultrasonic waves. Patent Document 3 discloses a technique for monitoring a drip state based on a detection result of a drop sensor and contacting a nurse station in the case of an abnormality. Patent Document 4 discloses a technique in which a drip liquid flow rate is electronically read using a rotary impeller having a magnet and the flow rate data is transmitted to a remote place such as an intensive care unit.

  Patent Document 5 discloses a technique related to flow rate detection that is used not for an infusion device but for general purposes. As in Patent Document 4, a flow rate detection that uses an impeller provided with a permanent magnet at the tip is used. Techniques related to this are disclosed. In other words, the flow sensor disclosed in Patent Document 5 is a general electromagnetic induction type sensor that rotates an impeller by applying a magnetic field that changes as the impeller rotates to an external Hall element. The flow rate of the liquid is detected.

JP 2007-007135 A Japanese Patent Application Laid-Open No. 08-098884 Japanese Patent Laid-Open No. 10-234851 US Pat. No. 4,187,847 US Pat. No. 3,636,767

  However, all of the sensors disclosed in Patent Documents 1 to 3 require a power supply circuit and have a correspondingly complicated configuration. As a result, when viewed as an application of an infusion device, the manufacturing cost increases.

  Note that, as described above, Patent Document 4 only discloses that a flow rate is electronically read with a magnet, and is it technically completed to exhibit a desired function? Since it is unknown, I think that it lacks concrete feasibility before manufacturing cost.

  Further, the electromagnetic induction type flow sensor as disclosed in Patent Document 5 is not suitable for the application of an infusion device because it cannot detect a minute flow rate due to its nature.

  That is, it is desired to provide a sensor (detection device) that accurately detects a minute flow rate of an infusion solution or the like, and an infusion device or a monitoring system including such a sensor at a low cost. The situation is not responding to.

  The present invention has been made in view of such a situation, and provides an infusion device, an infusion monitoring system, and a detection device that can accurately detect a minute flow rate of an infusion solution or the like at a low cost. Objective.

The drip device of the present invention (for example, the drip device 11 in the embodiment)
An infusion device including a drip line (for example, the drip line 22 in the embodiment) for flowing a drip liquid (for example, the infusion liquid 71 in the embodiment) accommodated in an infusion pack (for example, the infusion pack 21 in the embodiment) to the infusion needle,
One or more permanent magnets (for example, the permanent magnet 61 in the embodiment) are provided, and a moving member (for example, the moving member 53 in the embodiment) that moves the one or more permanent magnets by the force of the drip liquid flowing through the dropping line; ,
A magnetic sensing wire (for example, the magnetic sensing wire 54 in the embodiment) that generates a large Barkhausen jump phenomenon due to a change in the magnetic field caused by the movement of the one or more permanent magnets;
A detection coil suspended around the magnetic sensing wire, which generates an induced electromotive force due to the large Barkhausen jump phenomenon generated in the magnetic sensing wire and outputs a pulse signal (for example, detection in the embodiment) Coil 55),
A signal detector (for example, signal detector 56 in the embodiment) for detecting the pulse signal output from the detection coil;
It is an infusion device provided with.

  (1) According to the present invention, since the drip liquid is detected by utilizing the large Barkhausen jump phenomenon, it is possible to output a pulse signal as a detection signal without a power source.

  (2) Since the drip device of the present invention has a simple configuration as described above, it can be realized at a low cost. The effect (2) becomes even more conspicuous when combined with the effect (1) (the effect that a power supply circuit is unnecessary because there is no power supply).

  (3) The pulse signal output from the detection coil is generated due to the magnetization reversal in the magnetosensitive wire. The speed of this magnetization reversal depends only on the large Barkhausen jump phenomenon, and the external magnetic field It is unrelated to time change. Therefore, in order for the detection coil to output a pulse signal, it is sufficient to generate a large Barkhausen jump phenomenon, and it is not affected by the temporal change of the external magnetic field. As a result, if the permanent magnet moves due to the force of the instilled liquid and changes even the external magnetic field, a large Barkhausen jump phenomenon will occur regardless of the infusion liquid flow rate (even if the infusion liquid has a very low flow rate). A pulse signal is output from the detection coil, and the drip liquid can be detected. That is, the drip device of the present invention can accurately detect even a drip liquid with a minute flow rate.

  In this case, the moving member is an impeller in which the permanent magnets are respectively disposed at a plurality of tip portions, and the impeller is arranged to rotate by the force of the drip liquid to be dropped. You may make it.

  In this case, the signal detection unit may include a photocoupler.

The drip monitoring system of the present invention comprises:
An infusion device (for example, an embodiment) including a dripping line (for example, the dripping line 22 in the embodiment) for flowing an infusion liquid (for example, the infusion liquid 71 in the embodiment) contained in an infusion pack (for example, the infusion pack 21 in the embodiment) to the infusion needle An instillation device 11) and a monitoring device (for example, the monitoring device 12 in the embodiment) for monitoring the infusion device,
The infusion device is
One or more permanent magnets (for example, the permanent magnet 61 in the embodiment) are provided, and a moving member (for example, the moving member 53 in the embodiment) that moves the one or more permanent magnets by the force of the drip liquid flowing through the dropping line; ,
A magnetic sensing wire (for example, the magnetic sensing wire 54 in the embodiment) that generates a large Barkhausen jump phenomenon due to a change in the magnetic field caused by the movement of the one or more permanent magnets;
A detection coil suspended around the magnetic sensing wire, which generates an induced electromotive force due to the large Barkhausen jump phenomenon generated in the magnetic sensing wire and outputs a pulse signal (for example, detection in the embodiment) Coil 55),
A signal detector (for example, signal detector 56 in the embodiment) for detecting the pulse signal output from the detection coil;
Have
The monitoring device
It is an infusion monitoring system that monitors the infusion device based on the pulse signal detected by the signal detection unit of the infusion device.

  According to this invention, the drip monitoring system includes a drip device capable of producing the effects (1) to (3) described above as a component. Therefore, due to the effects (1) and (2), the entire drip monitoring system can be realized at low cost. Further, due to the effect of (3), various monitoring methods can be adopted, and it is possible to quickly and accurately determine the abnormality of the infusion device. In particular, considering that a drip liquid with a minute flow rate can be detected, this effect becomes even more prominent when an abnormality in the drip liquid drainage is detected.

  In this case, the monitoring device compares the prescribed value with at least one of the interval and the number of pulses included in the pulse signal detected in a predetermined time by the signal detection unit of the infusion device, The drip device may be monitored, and a warning signal may be further output when the prescribed value is exceeded.

The detection device of the present invention (for example, the detection device 101 in the embodiment)
A detection device for detecting an object (for example, the object 103 in the embodiment) passing through a predetermined line (for example, the line 102 in the embodiment),
One or more permanent magnets (for example, the permanent magnet 121 in the embodiment) are provided, and a moving member (for example, the moving member 111 in the embodiment) that moves the one or more permanent magnets by the force of the object passing through the line ,
A magnetic sensing wire (for example, the magnetic sensing wire 112 in the embodiment) that generates a large Barkhausen jump phenomenon due to a change in the magnetic field caused by the movement of the one or more permanent magnets;
A detection coil suspended around the magnetic sensing wire, which generates an induced electromotive force due to the large Barkhausen jump phenomenon generated in the magnetic sensing wire and outputs a pulse signal (for example, detection in the embodiment) Coil 113);
A signal detection unit (for example, the signal detection unit 114 in the embodiment) that detects the pulse signal output from the detection coil;
It is a detection apparatus provided with.

  According to the present invention, it is possible to detect not only the drip liquid dropped by the drip device, but also any object passing through a predetermined line. The effect (3) can be achieved.

In this case, the apparatus further includes a mounting portion (for example, the mounting portion 51 in the embodiment) that can be freely attached to and detached from a drip line (for example, the infusion line 22 in the embodiment) provided in the infusion device (for example, the infusion device 11 in the embodiment).
When the detection device is mounted on the dropping line by the mounting portion, the moving member can move the one or more permanent magnets by the force of drip liquid flowing through the dropping line.

  According to the present invention, it is possible to provide an apparatus capable of accurately detecting a minute flow rate such as a drip liquid at a low cost.

It is a side view showing the schematic structure of the drip monitoring system concerning one embodiment of the present invention. It is a perspective view which shows schematic structure of the drip sensor of the drip monitoring system of FIG. It is a top view which shows schematic structure of the dripping sensor of FIG. It is a functional block diagram which shows the outline of the functional structure of the detection apparatus which concerns on one Embodiment of this invention.

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

  FIG. 1 is a side view showing a schematic configuration of an infusion monitoring system according to an embodiment of the present invention.

  The infusion monitoring system includes an infusion device 11, a monitoring device 12, an antenna 13, a cable 14, and a gantry 15.

  The infusion device 11 includes an infusion pack 21, a drip line 22, a drip sensor 23, and a connector 24.

  The drip pack 21 is a pack for storing a drip solution 71 such as a drug solution or blood, and drip the drip solution 71 by being hung on the retaining piece 32 of the gantry 15. The drip line 22 has one end connected to the drip pack 21 and the other end connected to the connector 24, and allows the drip liquid 71 dripped from the drip pack 21 to flow to the connector 24. The drip sensor 23 is provided in the middle of the drip line 22 and detects a drip liquid 71 flowing through the drip line 22. The details of the dropping sensor 23 will be described later with reference to the drawings after FIG. The connector 24 is connected to an infusion needle (not shown), and supplies the infusion liquid 71 flowing through the instillation line 22 to the infusion needle.

  The monitoring device 12 is connected to the dropping sensor 23 by the cable 14 and acquires the detection result of the dropping sensor 23. And the monitoring apparatus 12 monitors the flow volume and flow velocity of the drip liquid 71 as a drip state based on the detection result of the drip sensor 23, for example. As a result of the monitoring, the monitoring device 12 generates a warning signal and transmits it to the nurse station or the like via the antenna 13 when it is determined that an abnormality has occurred in the infusion device 11 such as the infusion of the infusion solution 71, for example. To do. Note that the transmission method to the nurse station or the like employs a wireless direct transmission method in the present embodiment, but is not particularly limited thereto. For example, a method including at least a part of a wire, the Internet, or the like It is possible to adopt a method involving a predetermined network.

  The gantry 15 includes a column 31 to which the monitoring device 12 is attached, and a hooking piece 32 on which the drip pack 21 is suspended as described above.

  Hereinafter, with reference to FIG.2 and FIG.3, the detail of the dripping sensor 23 is demonstrated.

  FIG. 2 is a perspective view showing a schematic configuration of the dropping sensor 23. FIG. 3 is a top view showing a schematic configuration of the dropping sensor 23.

  The dropping sensor 23 includes a mounting portion 51, a dropping chamber 52, a moving member 53, a magnetic sensing wire 54, a detection coil 55, a signal detection portion 56, and a terminal 57.

  The drip sensor 23 can be freely attached to and detached from the drip line 22 by the mounting portion 51. When the drip sensor 23 is mounted on the drip line 22 by the mounting unit 51, the drip liquid 71 dripped from the drip pack 21 flows through the drip line 22 via the drip chamber 52 and is connected to the connector 24. Supplied to a needle (not shown).

  In this embodiment, the moving member 53 is configured as an impeller provided in the dropping chamber 52. One permanent magnet 61 is disposed at each of a plurality of tip portions of the impeller, which is the moving member 53, so that the polarity is reversed from that of the adjacent one. The impeller serving as the moving member 53 has a function similar to that of a so-called water wheel, and rotates in the counterclockwise direction in FIG. That is, the moving member 53 has a function of rotating the plurality of permanent magnets 61 counterclockwise in FIG. 2 by the force of the drip solution 71 to be dropped.

  The magnetic sensitive wire 54 is a wire that generates a large Barkhausen jump phenomenon by a change in a magnetic field caused by the rotational movement of the plurality of permanent magnets 61.

  Here, the operation principle of the magnetic sensitive wire 54 that causes the large Barkhausen jump phenomenon will be described.

  The thin wire obtained as a result of drawing a ferromagnetic material has unique magnetic properties along with its alloy composition. When twisting stress is applied to such a wire, the wire is twisted more in the vicinity of the outer peripheral portion of the wire and less twisted in the central portion, so that the magnetic characteristics are different between the outer peripheral portion and the central portion. When processing is performed to leave this state, a ferromagnetic magnetic wire having different magnetic characteristics between the outer peripheral portion and the central portion can be obtained. Such a magnetic wire is the magnetic sensitive wire 54.

  The outer peripheral portion of the magnetic sensitive wire 54 has a magnetic characteristic that its magnetization direction is changed by a relatively small magnetic field. On the other hand, the central portion of the magnetic sensitive wire 54 has a magnetic characteristic that its magnetization direction is changed by a magnetic field larger than that of the outer peripheral portion. In other words, the magnetic sensitive wire 54 is formed with a composite magnetic body having two different magnetic properties, such as an outer peripheral portion that is relatively easily magnetized and a central portion that is relatively difficult to be magnetized.

  In both the central portion and the outer peripheral portion of the magnetic sensitive wire 54, the magnetization direction is not particularly determined at the initial stage. In such a magnetization state, when an external magnetic field sufficient to reverse the magnetization direction of the central portion is applied in parallel with the longitudinal direction of the magnetic sensitive wire 54, that is, the axial direction, the outer peripheral portion and the central portion are magnetized. The magnetization state is a state where the magnetization directions of both are the same. Next, when an external magnetic field capable of magnetizing only the outer peripheral portion is applied in the opposite direction, the magnetization state becomes a state in which the magnetization direction is reversed between the outer peripheral portion and the central portion. Even if the external magnetic field is removed at this time, the magnetization direction of the outer peripheral portion is held down by the magnetization of the central portion, and the magnetization state is stabilized. Hereinafter, the external magnetic field at this time is referred to as a “set magnetic field”.

  Next, an external magnetic field is applied in the direction opposite to the set magnetic field to increase it. When the external magnetic field strength exceeds a certain critical strength, the magnetization direction of the outer peripheral portion of the magnetic sensing wire 54 is rapidly reversed. Hereinafter, a magnetic field having such a critical strength is referred to as a “critical magnetic field”. In the reversal phenomenon at this time, the magnetic domain reversal occurs instantly when the domain wall of the outer peripheral portion moves in a state of avalanche depression. As a result, the magnetization directions of the outer peripheral portion and the central portion of the magnetic sensitive wire 54 are the same, and the magnetization state returns to the initial state. The phenomenon that the magnetization state is reversed so as to pass through this avalanche is the “large Barkhausen jump phenomenon”. Therefore, in order to generate the large Barkhausen jump phenomenon, the external magnetic field needs to be a magnetic field larger than the critical magnetic field, and such a magnetic field is hereinafter referred to as a “reset magnetic field”.

  As described above, in this embodiment, the external magnetic field required for causing the large Barkhausen jump phenomenon in the magnetic sensitive wire 54 is rotated counterclockwise in FIG. 2 by the force of the drip liquid 71 to be dropped. It is given by a plurality of permanent magnets 61. That is, due to the rotational movement of the plurality of permanent magnets 61, the external magnetic field applied to the magnetic sensitive wire 54 changes, and as a result, a large Barkhausen jump phenomenon occurs in the magnetic sensitive wire 54 in accordance with the above-described operating principle.

  The detection coil 55 is an electric coil suspended around the magnetic sensitive wire 54, and an induced electromotive force is generated in accordance with the large Barkhausen jump phenomenon generated in the magnetic sensitive wire 54 and outputs a pulse signal.

  The signal detection unit 56 detects the pulse signal output from the detection coil 55. In the present embodiment, the signal detection unit 56 is configured by a photocoupler, and a detection coil 55 is connected to the input end (end of the light emitting diode) of the photocoupler, and the output end (phototransistor or phototransistor) of the photocoupler. The diode side end) is connected to the terminal 57. That is, the pulse signal (electric signal) output from the signal detection unit 56 as a photocoupler is supplied to the monitoring device 12 in FIG. 1 via the cable 14 connected to the terminal 57. As will be described later, the configuration of the signal detection unit 56 is not particularly limited as long as it has a function of detecting the pulse signal output from the detection coil 55. Also good.

  In addition, when using the impeller of the structure of FIG. 2 as the moving member 53, it is good to provide the space | interval of each blade | wing so that the magnetic interference of permanent magnets 61 may not occur. Or you may make it arrange | position the permanent magnet 61 not to all the blade | wings but for example to every other or every two. In short, the arrangement of the permanent magnets 61 is preferably such that no magnetic interference occurs with the other permanent magnets 61.

  Next, the operation of the above drip monitoring system will be described.

  As shown in FIG. 1, the drip liquid 71 dripped from the drip pack 21 flows through the drip line 22 and is supplied to a drip needle (not shown) connected to the connector 24.

  The drip sensor 23 provided in the middle of the drip line 22 detects the drip liquid 71 to be dropped, and outputs a pulse signal as the detection signal. That is, as shown in FIG. 2, the moving member 53 configured as an impeller rotates counterclockwise in FIG. Accordingly, the permanent magnet 61 disposed at each of the plurality of tip portions of the moving member 53 also rotates and changes, and the surrounding magnetic field changes. The magnetic field changing in this way is applied to the magnetic sensitive wire 54 as an external magnetic field. That is, due to such a change in the external magnetic field, as described above, a large Barkhausen jump phenomenon occurs in the magnetic sensing wire 54, and as a result, an induced electromotive force is generated in the detection coil 55, and a pulse signal is output. The The signal detection unit 56 detects this pulse signal and outputs it to the monitoring device 12 in FIG. 1 via the cable 14 connected to the terminal 57.

  The monitoring device 12 receives the pulse signal output from the infusion device 11 and monitors the infusion device 11 based on the pulse signal. The monitoring method of the monitoring device 12 is not particularly limited as long as the pulse signal is used, but the following method is adopted in the present embodiment. That is, in this embodiment, the monitoring device 12 compares the prescribed value with at least one of the interval and the number of pulses included in the pulse signal for a predetermined time, and monitors the infusion device 11 based on the comparison result. . In other words, the flow rate and flow velocity of the drip liquid 71 can be easily calculated by using at least one of the interval and the number of pulses included in the pulse signal for a predetermined time. Therefore, the monitoring device 12 determines whether or not the flow rate or flow velocity of the drip liquid 71 is out of the specified value. If not, it can be recognized that the drip device 11 is normal. On the other hand, when the flow rate or flow rate of the drip liquid 71 is out of the specified value, the monitoring device 12 recognizes that an abnormality such as a drip in the drip liquid 71 has occurred in the drip apparatus 11. it can. When the monitoring device 12 recognizes the abnormality of the infusion device 11 in this manner, the monitoring device 12 generates a warning signal and transmits it to the nurse station or the like via the antenna 13.

  It should be noted that in the dropping sensor 23 of the present embodiment, the pulse signal output from the detection coil 55 and supplied to the monitoring device 12 is caused by the magnetization reversal in the magnetic sensitive wire 54 as described above. Although generated, the speed of this magnetization reversal depends only on the large Barkhausen jump phenomenon and is independent of the temporal change of the external magnetic field.

  That is, in the conventional flow sensor of Patent Document 5 or the like, in order to output a pulse signal as a detection signal, since it is an electromagnetic induction type, it is necessary to set the change rate of the external magnetic field to a certain level or more. In order to make the change of the external magnetic field, when an impeller provided with permanent magnets is employed as in the present embodiment, in order to make the change rate of the external magnetic field constant or more, the impeller is set to a constant rotational speed. It is necessary to rotate by the above. In order to increase the impeller to a certain rotational speed or more, it is necessary to rotate the impeller by flowing a liquid having a constant flow rate or more. This is because a conventional electromagnetic induction type flow sensor cannot output a pulse signal unless a liquid of a certain flow rate or more flows, in other words, it cannot detect a liquid with a flow rate lower than a certain flow rate. It means that the drip liquid 71 that is can not be detected.

  On the other hand, in the dropping sensor 23 of the present embodiment, in order for the detection coil 55 to output a pulse signal, it is only necessary to generate a large Barkhausen jump phenomenon, and it is not affected by the time change of the external magnetic field. As shown in FIG. 2, this is independent of the flow rate of the drip liquid 71 (even if the drip liquid has a minute flow rate) as long as the moving member 53 is rotated by the force of the drip liquid 71 and the external magnetic field changes. 71) Since a large Barkhausen jump phenomenon occurs, this means that a pulse signal is output from the detection coil 55 and the drip liquid 71 can be detected. That is, the drip sensor 23 of the present embodiment can accurately detect even the drip liquid 71 having a minute flow rate.

  It should be noted that the present invention is not limited to the present embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

  For example, in this specification, the system refers to a system that represents the entire apparatus including a plurality of apparatuses and processing units. Accordingly, as the components of the drip monitoring system, separate devices, i.e., the drip device 11 and the monitoring device 12 are provided in the embodiment of FIG. 1, but the present invention is not limited to this. For example, the drip sensor 23 of the drip device 11 One device having both functions of the monitoring device 12 may be provided.

  Further, for example, in the embodiment of FIGS. 1 to 3, the object to be detected by the drip sensor 23 is the drip liquid 71 flowing through the drip line 22 of the drip device 11, but the object to be detected according to the present invention is the same. It is not limited, and any object that passes a predetermined line may be used. Here, the state of the object may be any of three states of an individual, a liquid, and a gas. Further, the predetermined line does not mean a closed space like a pipe, but simply means a path through which an object passes, and may be an arbitrary path in the open space.

  Hereinafter, with reference to FIG. 4, a detection device that detects an arbitrary object passing through such a predetermined line will be described as an embodiment of the detection device according to the present invention.

  FIG. 4 is a functional configuration diagram showing an outline of a functional configuration of the detection apparatus 101 according to the embodiment of the present invention.

  The detection apparatus 101 includes a moving member 111, a magnetic sensitive wire 112, a detection coil 113, and a signal detection unit 114 in order to detect an arbitrary object 103 that passes through a predetermined line 102.

  The moving member 111 is provided with one or more permanent magnets 121 and moves the one or more permanent magnets 121 by the force of the object 103 passing through the line 102. The magnetic sensitive wire 112 generates a large Barkhausen jump phenomenon due to a change in the magnetic field caused by the movement of the one or more permanent magnets 121. The detection coil 113 is an electric coil suspended around the magnetic sensing wire 112, and an induced electromotive force is generated in accordance with the large Barkhausen jump phenomenon generated in the magnetic sensing wire 112 and outputs a pulse signal. The signal detection unit 114 detects the pulse signal output from the detection coil 113 and outputs it to the outside.

  Here, as can be easily understood by comparing the drip sensor 23 of FIGS. 1 to 3 with the detection device 101 of FIG. 4, the superordinate concept of the drip sensor 23 is the detection device 101. In other words, the drip sensor 23 is a preferred embodiment of the detection apparatus 101 when the drip line 22 is employed as the line 102 and the drip liquid 71 is employed as the detection target.

  The moving member 111 only needs to have a function of moving the permanent magnet 121 so as to generate a large Barkhausen jump phenomenon in the magnetic sensitive wire 112, and the configuration thereof is not particularly limited. The moving member 53 of FIG. 2 adopts an impeller as such a configuration. In addition, for example, the moving member 111 may have a configuration such as a so-called “deer dance”.

  The signal detection unit 114 only needs to have a function of detecting the pulse signal output from the detection coil 113 and outputting the pulse signal to the outside, and the configuration thereof is not particularly limited. A signal detection unit 56 in FIG. 2 employs a photocoupler as such a configuration. In addition, for example, the signal detection unit 114 may be configured by, for example, an electromagnetic relay, a relay using a thyristor element, or the like. Further, the signal detection unit 114 may be configured to directly guide the signal from the detection coil 113 to the cable 14.

  2 employs a magnetic sensing wire 54 and a detection coil 55 as the magnetic sensing wire 112 and the detection coil 113 in FIG. 4, and a mounting portion that can be freely attached to and detached from the dropping line 22. 51 and a terminal 57 connected to the cable 14 are provided.

  The present invention can provide the following effects (1) to (4), for example, regardless of the various embodiments.

  (1) Since the detection apparatus 101 according to the present invention (including the drop sensor 23 in FIG. 2 and the same below) can detect the object 103 using the large Barkhausen jump phenomenon, a pulse signal as the detection signal thereof Can be output without a power source.

  (2) Moreover, since the detection apparatus 101 according to the present invention has a simple configuration as shown in FIGS. 2 to 4, it can be realized at low cost. The effect (2) becomes even more conspicuous when combined with the effect (1) (the effect that a power supply circuit is unnecessary because there is no power supply).

  (3) As described above using the drip sensor 23 of FIG. 2, in the detection device 101 according to the present invention, the pulse signal output from the detection coil 113 is generated due to magnetization reversal in the magnetic sensitive wire 112. The The speed of this magnetization reversal depends only on the large Barkhausen jump phenomenon and is independent of the temporal change of the external magnetic field. Therefore, in order for the detection coil 113 to output a pulse signal, it is sufficient that a large Barkhausen jump phenomenon occurs, and the detection coil 113 is not affected by the temporal change of the external magnetic field. Thus, as long as the permanent magnet 121 moves due to the force of the object 103 passing through the predetermined line 102 and the external magnetic field changes, the flow rate of the object 103 is irrelevant (even if the object 103 has a minute flow rate). Since the large Barkhausen jump phenomenon occurs, a pulse signal is output from the detection coil 113 and the object 103 can be detected. That is, the detection apparatus 101 according to the present invention can accurately detect even the target 103 having a minute flow rate.

  (4) A very small component can be adopted as a component for causing the large Barkhausen jump phenomenon. For example, the dimensions of the permanent magnet 121 are about 1.0 mm to 2.0 mm in diameter and about 5 mm to 10 mm in length, and the diameter of the magnetic sensitive wire 112 is on the order of 0.25 mm or less. Even if such a detection device 101 is provided in the drip line 22 of the drip device 11, it does not cause any obstacle in handling.

DESCRIPTION OF SYMBOLS 11 Drip apparatus 12 Monitoring apparatus 13 Antenna 14 Cable 15 Base 21 Drip pack 22 Drip line 23 Drip sensor 24 Connector 51 Mounting part 52 Drip chamber 53 Moving member 54 Magnetosensitive wire 55 Detection coil 56 Signal detection part 57 Terminal 61 Permanent magnet 71 Drip Liquid 101 Detection device 102 Line 103 Object 111 Moving member 112 Magnetosensitive wire 113 Detection coil 114 Signal detection unit

Claims (6)

In an infusion device including a drip line for flowing drip liquid contained in an infusion pack to a drip needle through a drip chamber ,
One or more permanent magnets are provided, and a moving member that moves the one or more permanent magnets by the force of the drip liquid flowing through the dropping line;
A magnetic sensitive wire that is provided outside the dropping chamber and generates a large Barkhausen jump phenomenon by a change in magnetic field caused by movement of the one or more permanent magnets;
A detection coil suspended around the magnetic sensing wire, wherein the induced electromotive force is generated along with the large Barkhausen jump phenomenon generated in the magnetic sensing wire, and a detection coil that outputs a pulse signal;
A signal detection unit for detecting the pulse signal output from the detection coil;
Equipped with a,
The moving member is an impeller provided in the dropping chamber and arranged to rotate by the force of the drip liquid to be dropped, and having a plurality of tips.
The permanent magnets are respectively disposed with the polarity reversed at intervals at which magnetic interference does not occur at the plurality of tip portions.
Infusion device. The infusion apparatus according to claim 1, wherein the signal detection unit includes a photocoupler. In an infusion monitoring system comprising an infusion device including an infusion line for flowing an infusion solution contained in an infusion pack to an infusion needle through an infusion chamber, and a monitoring device for monitoring the infusion device.
The infusion device is
One or more permanent magnets are provided, and a moving member that moves the one or more permanent magnets by the force of the drip liquid flowing through the dropping line;
A magnetic sensitive wire that is provided outside the dropping chamber and generates a large Barkhausen jump phenomenon by a change in magnetic field caused by movement of the one or more permanent magnets;
A detection coil suspended around the magnetic sensing wire, wherein the induced electromotive force is generated along with the large Barkhausen jump phenomenon generated in the magnetic sensing wire, and a detection coil that outputs a pulse signal;
A signal detection unit for detecting the pulse signal output from the detection coil;
Have
The moving member is an impeller provided in the dropping chamber and arranged to rotate by the force of the drip liquid to be dropped, and having a plurality of tips.
For each interval at which magnetic interference does not occur at the plurality of tip portions, the permanent magnets are respectively disposed with the polarity reversed,
The monitoring device
An infusion monitoring system that monitors the infusion device based on the pulse signal detected by the signal detection unit of the infusion device. The monitoring device
The infusion device is monitored by comparing at least one of the interval and the number of pulses included in the pulse signal detected at a predetermined time by the signal detection unit of the infusion device with a prescribed value, and the prescribed The drip monitoring system according to claim 3 , further outputs a warning signal when the value is out of the range. In a detection device for detecting drip passing through a predetermined line via a drip chamber ,
One or more permanent magnets are provided, and a moving member that moves the one or more permanent magnets by the force of the drip solution passing through the line;
A magnetic sensitive wire that is provided outside the dropping chamber and generates a large Barkhausen jump phenomenon by a change in magnetic field caused by movement of the one or more permanent magnets;
A detection coil suspended around the magnetic sensing wire, wherein the induced electromotive force is generated along with the large Barkhausen jump phenomenon generated in the magnetic sensing wire, and a detection coil that outputs a pulse signal;
A signal detection unit for detecting the pulse signal output from the detection coil;
Equipped with a,
The moving member is an impeller provided in the dropping chamber and arranged to rotate by the force of the drip liquid to be dropped, and having a plurality of tips.
The permanent magnets are respectively disposed with the polarity reversed at intervals at which magnetic interference does not occur at the plurality of tip portions.
Detection device. It further comprises a mounting part that can be freely attached to and detached from the drip line provided in the drip device,
The detection device according to claim 5, wherein when the detection device is mounted on the dropping line by the mounting portion, the moving member moves the one or more permanent magnets by the force of drip liquid flowing through the dropping line. .

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