JP2017202259A - Drip detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drip detector having high accuracy of determining a type of an infusion set, and an infusion pump using the drip detector.SOLUTION: The drip detector includes: light-emitting devices; a plurality of light-receiving devices for receiving light exited by the light-emitting devices; a droplet fall control part for controlling lighting and lights-out of the light-emitting devices; and a data processing part to which an output voltage generated in each light-receiving device by receiving the light of the light-emitting device and that determines a type of an infusion set on the basis of a result of the output voltage. The light-emitting devices and the plurality of light-receiving devices are disposed in such a relationship that the number of optical axes blocked by a drip opening of an infusion set in 60 drop configuration becomes (a) or (a-1) according to the mounting state of the infusion tube on the drip detector, and the number of optical axes blocked by an a drip opening of an infusion set in 20 drop configuration becomes (b) or (b-1) according to a mounting state of the infusion tube on the droplet detector. In this regard, a relationship of a<b-1 is satisfied, where (a) and (b) are natural numbers and (a) is 2 or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an infusion detector that determines the type of infusion set to be used, and an infusion pump including the infusion detector.

  Infusion pumps are widely used in the medical field as devices capable of accurately and continuously supplying medicinal solutions and the like to patients. The infusion set attached to the infusion pump and connected to the patient is a sterilized disposable product, and the infusion set includes a drip tube for visually confirming an approximate flow rate.

  The infusion set attached to the infusion pump is classified into two types, a 20-drop infusion set and a 60-drop infusion set. A 20-drop drip tube drops 1 mL into 20 drops, and a 60-drop drip tube drops 1 mL into 60 drops. The infusion pump is provided with a drip detector that detects a droplet falling in the drip tube as a standard or optional, and monitors the flow rate of the infusion during the infusion. For example, when the type of the infusion set attached to the infusion pump is different from the setting conditions set by the operator on the infusion pump, the infusion pump detects an abnormal flow rate and stops the infusion even when the infusion starts. Patent Document 1 discloses an infusion pump having a function of automatically discriminating the type of infusion set in an infusion detector. In Patent Document 1, the light emitting element and the light receiving element are arranged so as to sandwich the infusion tube, and the optical axis input from the light emitting element to the light receiving element is blocked by the infusion port of the infusion tube. The type of infusion set is determined.

Utility Model Registration No. 318504

  However, in the infusion pump disclosed in Patent Document 1, if three of the three optical axes input from one light emitting element to three light receiving elements are blocked, 20 drops are infused. When the set has one central optical axis blocked, it is determined that the 60-drop infusion set is attached. Therefore, the detection range of the infusion port of the 60-drop infusion set is only a range for one optical axis, and when the installation of the infusion tube to the infusion detector is not ideal or due to variations in the production of the infusion tube, If the infusion port is displaced from the ideal position, the type of infusion set may not be correctly identified.

  The present invention provides an infusion detector having high accuracy in determining the type of infusion set, and an infusion pump using the same.

The drip detector of the present invention is
An infusion detector for outputting a detection signal of a droplet falling in an infusion tube to an infusion pump main body constituting an infusion pump,
One or more light emitting elements disposed on one side of the outside of the infusion tube;
A plurality of light receiving elements arranged on the opposite side of the one side outside the infusion tube and receiving light emitted from the light emitting elements;
A drip controller that controls turning on and off of the light emitting element;
An output voltage generated in each light receiving element by receiving the light of the light emitting element is transmitted, and based on the result of the output voltage, a type of infusion set is determined, and a data processing unit,
A plurality of optical axes respectively connecting the light emitting element and the plurality of light receiving elements are all in a single plane,
When the 60-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 60-drop infusion set depends on the mounting state of the drip tube to the drip detector. -1 or a,
When a 20-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 20-drop infusion set depends on the mounting state of the drip tube to the drip detector. The light emitting element and the plurality of light receiving elements are arranged in a positional relationship of −1 or b. However, the relationship of a <b-1 is satisfied, a and b are natural numbers, and a is 2 or more.

The control method of the drip detector of the present invention is:
The light emitting element is caused to emit light by the drop control unit,
The output voltage of each light receiving element generated by receiving light of the light emitting element is input to the data processing unit,
The data processing unit determines the type of infusion set based on the result of the output voltage.

The infusion pump of the present invention includes the drip detector of the present invention and an infusion pump body,
The infusion pump body is
A setting input unit / control unit into which the determination result of the type of infusion set by the data processing unit is input,
A tube pressing part for pressing the tube of the infusion set;
A motor for driving the tube pressing portion;
A motor drive unit that controls rotation of the motor in accordance with a stop signal or a rotation signal input from the setting input unit / control unit,
The setting input unit / control unit
The type of the infusion set determined by the data processing unit is compared with the type of the infusion set previously input to the setting input unit / control unit, and if both match, a rotation signal is sent to the motor drive unit. If the two do not match, a stop signal is input to the motor drive unit.

  ADVANTAGE OF THE INVENTION According to this invention, the infusion detector using the infusion set which has the high determination precision of the kind of infusion set, its control method, and the said infusion detector can be provided.

FIG. 1 is a schematic configuration diagram of an infusion pump including an infusion detector according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining a holding state of an infusion tube by an infusion detector according to an embodiment of the present invention. 3A is a schematic diagram for explaining the first light emitting unit and the first light receiving unit of the drip detector shown in FIG. 1, and FIG. 3B is the second light emitting unit and the second light receiving unit of the drip detector shown in FIG. The schematic diagram explaining a part. FIG. 4 shows the positional relationship between the optical axis between the first light emitting element 31a and the first light receiving elements 41a to 41e of the drip detector shown in FIG. 3A and the arrangements a _{2 to} d ₂ of the drip inlets of the 20 drop infusion set. Explanatory drawing which showed. 5A to 5E are graphs showing output voltages of the first light receiving elements 41a to 41e that receive the light of the first light emitting element 31a of the drip detector shown in FIG. FIG. 6 shows the positional relationship between the optical axis between the first light emitting element 31a and the first light receiving elements 41a to 41e of the drip detector shown in FIG. 3A and the arrangements a _{6 to} d ₆ of the drip inlets of the 60 drop infusion set. Explanatory drawing which showed. 7A to 7F are graphs showing output voltages of the first light receiving elements 41a to 41e that receive the light of the first light emitting element 31a of the drip detector shown in FIG.

  The drip detector of the present invention includes one or more light emitting elements and a plurality of light receiving elements that receive light emitted from the light emitting elements. In the drip detector of the present invention, for example, the type of infusion set is discriminated based on the difference in output voltage drop caused by the light input from the light emitting element to the light receiving element being blocked by the drip port of the drip tube. ing. In the drip detector of the present invention, when the 60-drop infusion set is mounted on the drip detector, the light-emitting element and the plurality of light-receiving elements have the number of optical axes blocked by the drip port of the 60-drop infusion set, Depending on the mounting state of the infusion tube to the infusion detector, it becomes a-1 or a, and when the 20-drop infusion set is attached to the infusion detector, the optical axis blocked by the infusion port of the 20-drop infusion set The numbers are arranged in a positional relationship such that b-1 or b depending on the mounting state of the infusion tube to the infusion detector. However, the relationship of a <b-1 is satisfied, a and b are natural numbers, and a is 2 or more. For this reason, when the drip tube is not ideally mounted on the drip detector or due to variations in the manufacture of the drip tube, even if the drip port of the 60-drop infusion set is displaced from the ideal position, the light emitting element The probability that the emitted light is blocked by the drip inlet increases. Therefore, the drip detector of the present invention can determine the type of infusion set better than the conventional drip detector.

  In the present invention, “when the 60-drop infusion set is attached to the drip detector, the number of the optical axes that are blocked by the drip port of the 60-drop infusion set depends on the drip detector of the drip tube. "It becomes a-1 or a according to the mounting state of" when the mounting position of the drip tube to the drip detector is a predetermined position, the number of optical axes blocked by the drip port of the 60-drop infusion set is When it is a-1 and the mounting position of the drip tube on the drip detector is another predetermined position, it means that the number of optical axes blocked by the drip port of the 60-drop infusion set is a. Similarly, “when the 20-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 20-drop infusion set is the mounting state of the drip tube on the drip detector. "It becomes b-1 or b depending on" when the mounting position of the drip tube on the drip detector is a predetermined position, the number of optical axes blocked by the drip port of the 20 drop infusion set is b- When the mounting position of the drip tube to the drip detector is another predetermined position, it means that the number of optical axes blocked by the drip port of the 20-drop infusion set is b.

  Next, an infusion detector according to an embodiment of the present invention, a control method therefor, and an infusion pump including the infusion detector will be described with reference to FIGS.

  FIG. 1 is a schematic configuration diagram of an infusion pump 2 according to an embodiment of the present invention, and an infusion pump 1 including an infusion detector 2 and an infusion pump body 12. A flexible tube 10 is connected to an infusion bag 11 constituting the infusion set via a drip tube 8. The infusion in the flexible tube 10 is sent downward when the flexible tube 10 is squeezed downward by the tube pressing portion 17 and sent to the patient to which the infusion set is connected.

  The drip detector 2 includes a first light emitting unit 31, a first light receiving unit 41, a second light emitting unit 32, and a second light receiving unit 42, which are arranged to face each other with the drip tube 8 interposed therebetween. The first light emitting unit 31 and the second light emitting unit 32 are disposed on one side outside the infusion tube 8, and the first light receiving unit 41 and the second light receiving unit 42 are opposite to the one side outside the infusion tube 8. Is arranged. The first light emitting unit 31 and the first light receiving unit 41 are provided for determining the type of infusion set attached to the infusion pump, and the second light emitting unit 32 and the second light receiving unit 42 are used for detecting the droplet 9. It is provided for.

  As shown in FIG. 2, the drip detector includes a drip tube holding unit 6 that holds a drip tube 8, and the drip tube holding unit 6 has, for example, a substantially U shape when viewed from the top. It is a holder. On the inner surface of the drip tube holding part, the first light emitting part 31 and the first light receiving part 41, and the second light emitting part 32 and the second light receiving part 42 are arranged to face each other. The drip tube holding part 6 has holding means such as a leaf spring (not shown) on the inner surface, and holds the drip tube 8 detachably from the inlet side (drip tube mounting start side) 61. The drip tube 8 may be disposed on the far side 64 of the internal space 62 of the drip tube holding unit 6 from the ideal position for detecting the drip port 81 or the droplet 9, or the inlet side 61. It may be arranged in.

As shown in FIG. 1, the first light emitting unit 31 and the first light receiving unit 41 include optical axes L _{1 to} L ₅ (see FIG. 3A) between the first light emitting unit 31 and the first light receiving unit 41. The surface is arranged at a position penetrated by the drip port 81 of the drip tube 8. On the other hand, the second light emitting unit 32 and the second light receiving unit 42 are disposed below the downstream end of the drip port 81, and the optical axis between the second light emitting unit 32 and the second light receiving unit 42 is arranged. The surface to be included is arranged on the downstream side of the liquid flowing in the drip tube 8 from the surface including the optical axis between the first light emitting unit 31 and the first light receiving unit 41.

The infusion set attached to the infusion pump is classified into two types, a 20-drop infusion set and a 60-drop infusion set. A 20-drop drip tube drops 1 mL into 20 drops, and a 60-drop drip tube drops 1 mL into 60 drops. Therefore, the drip port b ₂₀ (see FIG. 3) of the drip tube 8 constituting the 20-drop infusion set is larger than the drip port b ₆₀ (see FIG. 3) of the drip tube 8 constituting the 60-drop infusion set.

  In FIG. 3A, the first light emitting unit 31 includes one first light emitting element 31 a, but the number of the first light emitting elements 31 a is in the region between the first light emitting unit 31 and the first light receiving unit 41. From the viewpoint of expanding the detection range of the infusion opening 81, a plurality of the number may be used. The first light receiving unit 41 includes a plurality of first light receiving elements, and the number of the first light receiving elements is equal to the detection range of the drip mouth 81 in the region between the first light emitting unit 31 and the first light receiving unit 41. From the viewpoint of spreading, it is preferably 5 or more, more preferably 6 or more, and from the viewpoint of economy, it is 7 or less.

  In the first light receiving unit 41, the first light receiving elements 41a to 41e are such that the optical axis between the first light emitting element 31a and the first light receiving elements 41a to 41e is the drop direction of the droplet 9 (see FIG. 1). It arrange | positions so that it may fit in the orthogonal horizontal plane.

  In FIG. 3B, the second light emitting unit 32 includes a plurality of second light emitting elements 32a to 32e, and the second light receiving unit 42 includes a plurality of second light receiving elements 42a to 42g. In FIG. 3B, the number of the second light emitting elements is five and the number of the second light receiving elements is seven. However, in the drip detector 1 of the present invention, the number of the second light emitting elements is the drop detection range. From the viewpoint of spreading, it is preferably 3 or more, more preferably 5 or more, and from the viewpoint of economy, it is 7 or less. The number of second light receiving elements may be equal to or greater than the number of light emitting elements, but is preferably 3 or more, more preferably 5 or more, from the viewpoint of expanding the detection range of droplets, from the viewpoint of economy. 7 or less.

  The second light receiving elements 42a to 42g and the second light emitting elements 32a to 32e are such that any of the optical axes between them is within a single horizontal plane perpendicular to the drop direction of the droplet 9 (see FIG. 1). Has been placed.

  As the 1st light emitting element 31a and the 2nd light emitting elements 32a-32e, LED, a semiconductor laser, etc. which emit near infrared rays, respectively, are mentioned, for example. Each of the first light receiving elements 41a to 41d and the second light receiving elements 42a to 42g includes, for example, a photodiode or a phototransistor that converts received light into an electric signal (output voltage).

The drip detector 2 includes a drip tube holding unit 6 that holds the drip tube 8, and in a preferred example of the present invention, the output voltage of the first light receiving element 41e when the drip detector 2 is mounted with a 20 drop drip set. However, when the optical axis L ₅ is lower than that when only the outer wall of the drip tube 8 is passed, the data processing unit 7 sends an abnormal signal to the setting input unit / control unit 13 of the infusion pump body 12. The first light receiving element 41e is disposed closest to the inlet side of the drip tube 8 of the drip tube holding part 6 among the plurality of first light receiving elements 41a to 41e.

  The first light receiving element 41e is, for example, a position where the optical axis between the first light emitting element 31a and the first light receiving element 41e does not pass through an appropriate region 63 (see FIG. 4) where the drip port 81 is properly arranged. Placed in. The appropriate region 63 is, for example, inside a circle having a predetermined radius centered on the ideal mounting position, which is determined when the arrangement of the first light emitting element and the first light receiving element is determined. The radius is determined in consideration of variations in the position of the drip port, which is assumed from variations in the manufacture of the drip tube of the infusion set and variations in the manner in which the drip tube 8 is attached to the drip tube holding unit 6. Is done.

  As described above, when the plurality of first light receiving elements include the first light receiving element 41e as the abnormality detecting light receiving element for detecting defective mounting of the drip inlet, types of the 20 drop infusion set and the 60 drop infusion set The improvement of the determination accuracy and the suppression of the mounting failure of the drip tube 8 of the 20-drop infusion set can both be achieved. In the first light receiving part 41, the abnormality detecting light receiving element may be provided on both the inlet side and the back side of the drip tube holding part 6, or may be provided only on the back side.

In FIG. 4, the output of the first light receiving element 41 e when the drip port 81 is at the position d ₂ and the optical axis L ₅ between the first light emitting element 31 a and the first light receiving element 41 e is blocked by the drip port 81. The voltage is lower than that when the optical axis L ₅ passes through only the outer wall of the drip tube 8 without passing through the drip port 81. In the data processing unit 7, the output voltage of the first light receiving element 41 e when the 20 drop drip set is mounted on the drip detector, the optical axis L ₅ does not pass through the drip inlet 81 and passes only through the outer wall of the drip tube 8. When the output voltage is lower than the output voltage of the first light receiving element 41e, an abnormal signal indicating that the installation of the drip tube is inappropriate is sent to the setting input unit / control unit 13 of the infusion pump body. Next, the setting input unit / control unit 13 inputs a stop signal to the motor driving unit 15 to stop the operation of the motor 16 and the tube pressing unit 17.

[Determination of the type of infusion set]
A part of the light emitted from the first light emitting unit 31 is blocked by the outer wall of the drip tube and the drip port 81, and reaches the first light receiving unit 41. Therefore, it is possible to determine whether the 60-drop infusion set or the 20-drop infusion set is attached to the drip detector 1 by detecting the degree of light blocking by the drip port 81. The amount of decrease in output voltage due to passing through both the outer wall and the mouth of the infusion tube is significantly larger than the amount of decrease in output voltage due to passing through only the outer wall of the infusion tube. Therefore, for example, if the output voltage when the optical axis passes through both the outer wall of the infusion tube and the infusion port is input to the data processing unit 7, the data processing unit 7 causes the optical axis to pass only the outer wall of the infusion tube. Can be distinguished from passing.

  Specifically, the first light receiving elements 41 a to 41 d receive the light emitted from the first light emitting element 31 a, and the output voltage generated in each first light receiving element due to the light reception is transmitted to the data processing unit 7. . In the data processing unit 7, the type of infusion set is determined according to the result of the output voltage. The light emission of the first light emitting element 31 a is controlled by a control signal from the droplet dropping control unit 5.

  In the following, as shown in FIG. 3A, an example of a method for determining the type of infusion set by the data processing unit 7 includes one first light emitting element and five first light receiving elements. A case will be described as an example.

(Detection of 20 drops infusion set)
FIG. 4 shows the optical axes L _{1 to} L ₅ between the first light emitting element 31a and the first light receiving elements 41a to 41d shown in FIG. 3A and the arrangements a _{2 to} d ₂ of the drip inlets 81 of the 20-drop infusion set. The positional relationship is shown. In FIG. 4, the arrangements a _{2 to} d ₂ mean variations in the mounting position of the infusion port 81, and the area surrounded by the circle 63 is an appropriate area where the infusion position of the 20-drop infusion set is appropriate. 63. FIG 5A~5E each is a graph placement of infusion ports 81 shows the output voltage of the first light receiving element 41a~41e having received when it is a ₂ to d _2, the light of the first light emitting element 31a .

As shown in FIGS. 5A and 5C, when the positions of the drip inlets are a ₂ and c ₂ , the three optical axes are blocked by the drip openings, and the output voltages of the three first light receiving elements are, for example, the optical axes. Is significantly lower than when only passing through the outer wall of the drip tube. Based on the sum of the reduction amounts of the output voltage or the number of first receiving elements in which the output voltage is significantly reduced, the data processing unit 7 determines that the 20-drop infusion set is attached.

As shown in Figure 5B, when the position of the infusion port is b _2, four optical axes is shielded by infusion port, the output voltage of the four first受素Ko is, for example, the optical axis is only the outer wall of the drip chamber It is significantly lower than when passing through. Based on the sum of the reduction amounts of the output voltage or the number of first receiving elements in which the output voltage is significantly reduced, the data processing unit 7 determines that the 20-drop infusion set is attached.

As shown in FIG. 5D, when the position of the drip mouth is d ₂ , the three optical axes are blocked by the drip mouth, and the output voltages of the three first receiving elements are, for example, only the outer wall of the drip tube whose optical axis is However, since the output voltage of the first light receiving element 41e disposed closest to the inlet side of the drip tube holding part 6 is lowered, a 20-drop infusion set is attached. However, it is determined to be a mounting failure.

  As shown in FIG. 5E, since there is no decrease in the output voltage for all of the first light receiving elements 41a to 41d, it is determined that no drip tube is attached to the drip tube holding unit 6.

(Detection of 60 drops infusion set)
FIG. 6 shows the optical axes L _{1 to} L ₅ between the first light emitting element 31a and the first light receiving elements 41a to 41e of the drip detector shown in FIG. 3A, and the arrangement a ₆ to the drip port 81 of the 60 drop infusion set. It shows the positional relationship between the d _6. FIGS. 7A to 7E are graphs showing output voltages of the first light receiving elements 41a to 41e that receive the light of the first light emitting element 31a when the arrangement of the infusion openings 81 is a _{6 to} d ₆ , respectively. .

As shown in FIG. 7A, FIG. 7B, FIG. 7D, and FIG. 7E, when the position of the infusion port is a ₆ , b ₆ , d ₆ , e ₆ , one optical axis is blocked by the infusion port, The output voltage of one of the first receiving elements is significantly lower than when, for example, the optical axis passes only through the outer wall of the drip tube. Based on the sum of the reduction amounts of the output voltage or the number of first receiving elements in which the output voltage is significantly reduced, the data processing unit 7 determines that the 60-drop infusion set is attached.

As shown in FIG. 7C, when the position of the infusion port is c ₆ , the two optical axes are blocked by the infusion port, and the output voltages of the two first receiving elements are, for example, only the outer wall of the infusion tube whose optical axis is It is significantly lower than when passing through. Based on the sum of the reduction amounts of the output voltage or the number of first receiving elements in which the output voltage is significantly reduced, the data processing unit 7 determines that the 60-drop infusion set is attached.

  As shown in FIG. 7F, since there is no decrease in the output voltage for all of the first light receiving elements 41a to 41d, it is determined that no infusion tube is attached to the infusion tube holder 6.

  As described above, when the 20-drop infusion set is mounted on the drip detector 2, the number of optical axes blocked by the drip port 81 of the 20-drop infusion set is the mounting state of the drip tube 8 to the drip detector 2. Accordingly, the number of optical axes blocked by the drip port 81 of the 60-drop infusion set when the 60-drop infusion set is attached to the drip detector 2 is 3 or 4. 1 or 2 depending on the mounting state.

  The number b-1 or b of the optical axis blocked by the drip port 81 of the 20-drop infusion set is not limited to 3 or 4, but preferably 3 or 4 from the viewpoint of expanding the detection range of the drip port 81. Preferably it is 4 or 5, and 5 or 6 from a viewpoint of economical efficiency. The number of optical axes a-1 or a blocked by the drip port 81 of the 60-drop infusion set is 1 or 2 as long as a <b-1 is satisfied, a and b are natural numbers, and a is 2 or more. However, it is preferably 2 or 3 from the viewpoint of expanding the detection range of the instillation port 81, and 3 or 4 from the viewpoint of economy. a and b are natural numbers, and a is a natural number of 2 or more.

  When the 60-drop infusion set is mounted on the drip detector 2, the number of optical axes blocked by the drip port 81 of the 60-drop infusion set depends on the state of attachment of the drip tube 8 to the drip detector 2. 1 or a, and when the 20-drop infusion set is mounted on the drip detector 2, the number of optical axes blocked by the drip port 81 of the 20-drop infusion set is the mounting state of the drip tube 8 on the drip detector 2 For example, the positional relationship between the first light emitting element and the plurality of first light receiving elements, which is b-1 or b, can be determined as follows, for example.

  For example, a plurality of optical axes pass through a circle with a predetermined radius centered on the ideal mounting position, and two optical axes pass through the infusion opening of a 60-drop infusion set inside the circle. The first light-emitting element and the plurality of first light-receiving elements (however, when the plurality of first light-receiving elements include an abnormality detection light-receiving element are excluded) are arranged. do it. The radius may be determined in consideration of the variation in the manufacturing position of the infusion tube of the infusion set and the variation in the arrangement position of the infusion port assumed from the variation in the manner in which the infusion tube 8 is attached to the infusion tube holder 6. Good.

  The data processing unit 7 outputs the determination result of the type of infusion set to the setting input unit / control unit 13 of the infusion pump main body 12. The setting input unit / control unit 13 determines the type of infusion set previously input by the operator to the setting input unit / control unit 13 and the determination result of the type of infusion set input from the data processing unit 7 (20 drops or 60 A drop). If the two match, the setting input unit / control unit 13 inputs a drive signal to the motor drive unit 15, and the motor drive unit 15 operates the motor 16 and operates the tube pressing unit 17. When the two do not match, the setting input unit / control unit 13 inputs a stop signal to the motor driving unit 15 to stop the operation of the motor 16 and the tube pressing unit 17.

  As described above, in the example of the present invention, when the 60-drop infusion set is mounted on the drip detector, the number of optical axes blocked by the drip port of the 60-drop infusion set is 1 according to the mounting state of the drip tube. Or the 1st light emitting element 31a and the 1st light receiving elements 41a-41e are arrange | positioned by the positional relationship used as two. For this reason, even when the infusion port 8 is not ideally mounted on the infusion detector 2 or due to manufacturing variations of the infusion tube 8, even if the infusion port deviates from the ideal position, the infusion tube 8 is not emitted from the first light emitting element. The probability that the illuminated light is blocked by the drip inlet is increased. Therefore, in the example of the drip detector of the present invention, the type of infusion set is different from the conventional drip detector in which the detection of the drip mouth of the 60-drop infusion set is performed by blocking only one optical axis. Judgment accuracy is high.

[Droplet detection]
As shown in FIG. 1, a part of the light emitted from the second light emitting unit 32 is blocked by the droplet 9 dropped from the drip inlet 81 and reaches the second light receiving unit 42. By detecting light blocking by the droplet 9, the number of droplets can be counted.

Specifically, as shown in FIG. 3B, the second light receiving elements 42a to 42g receive the light sequentially emitted from the second light emitting elements 32a to 32e. The output voltage generated by light reception by each of the second light receiving elements 42a to 42g varies every time the droplet 9 falls in the drip tube 8. In FIG. 3B, only the optical axes l ₁ to ₁₇ between the second light emitting element 32a and the second light receiving elements 42a to 42g are shown for simplification of the drawing, and the second light emitting elements 32b to 32e The optical axis between the second light receiving elements 42a to 42g is omitted. The analog value of the output voltage is converted into a digital signal by the data processing unit 7, and then output to the setting input unit / control unit 13 of the pump body 12 as a pulse signal indicating the drop of the droplet 9. Note that light emission of the second light emitting elements 32 a to 32 e is controlled by a control signal from the drop controller 5.

  The setting input unit / control unit 13 counts the pulse signal and converts the number of drops into a flow rate, and then determines whether the flow rate is within a normal range with respect to the flow rate preset in the setting input unit / control unit 13. To do. When the converted flow rate is within the normal range, the operation up to that time is continued. When the converted flow rate is outside the normal range, a stop signal is input from the setting input unit / control unit 13 to the motor drive unit 15, and The setting input unit / control unit 13 outputs an alarm notification signal to the alarm generation unit 14. The motor drive unit 15 to which the stop signal has been input stops the operation of the motor 16, and the alarm generation unit 14 to which the alarm notification signal has been input issues an alarm.

  The present disclosure further relates to one or more of the following embodiments.

[1] An infusion detector for outputting a detection signal of a droplet falling in an infusion tube to an infusion pump main body constituting an infusion pump,
One or more light emitting elements disposed on one side of the outside of the infusion tube;
A plurality of light receiving elements arranged on the opposite side of the one side outside the infusion tube and receiving light emitted from the light emitting elements;
A drip controller that controls turning on and off of the light emitting element;
An output voltage generated in each light receiving element by receiving the light of the light emitting element is transmitted, and based on the result of the output voltage, a type of infusion set is determined, and a data processing unit,
A plurality of optical axes respectively connecting the light emitting element and the plurality of light receiving elements are all in a single plane,
When the 60-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 60-drop infusion set depends on the mounting state of the drip tube to the drip detector. -1 or a,
When a 20-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 20-drop infusion set depends on the mounting state of the drip tube to the drip detector. The drip detector in which the light emitting element and the plurality of light receiving elements are arranged in a positional relationship of −1 or b.
However, the relationship of a <b-1 is satisfied, a and b are natural numbers, and a is 2 or more.
[2] The drip detector includes a drip tube holding unit that holds the drip tube,
The output voltage of the light receiving element arranged closest to the inlet side of the drip tube of the drip tube holding part of the plurality of light receiving elements when the drip detector is mounted with a 20 drop drip set, The data processing unit sends an abnormal signal to the setting input unit / control unit of the infusion pump main body when the optical axis is lower than that when only the outer wall of the drip tube is passed. Drip detector.
[3] When the light emitting element is referred to as a first light emitting element and the light receiving element is referred to as a first light receiving element,
One or more second light emitting elements disposed on the one side outside the infusion tube;
A plurality of second light receiving elements that are disposed on the opposite side of the one side outside the infusion tube and receive light emitted from the second light emitting elements;
The plurality of optical axes that respectively connect the second light emitting element and the plurality of second light receiving elements each include a plurality of optical axes that respectively connect the first light emitting element and the plurality of first light receiving elements. In a single plane, separate from
The drop controller controls turning on and off of the second light emitting element;
The data processing unit receives an output voltage generated in the second light receiving element by receiving the light of the second light emitting element, detects the droplet based on the result of the output voltage, and The drip detector according to [1] or [2], wherein a droplet detection signal is output to a setting input unit / control unit of the pump body.
[4] The method of controlling an infusion detector according to [1],
The light emitting element is caused to emit light by the drop control unit,
Output the output voltage of each light receiving element generated by receiving light of the light emitting element to the data processing unit,
The drip detector control method, wherein the data processing unit determines the type of infusion set based on the result of the output voltage.
[5] The drip detector includes a drip tube holding unit that holds the drip tube,
The output voltage of the light receiving element arranged closest to the inlet side of the drip tube of the drip tube holding part of the plurality of light receiving elements when the drip detector is mounted with a 20 drop drip set, The data processing unit sends an abnormality signal to the setting input unit / control unit of the infusion pump main body when the optical axis is lower than that when only the outer wall of the infusion tube passes through the optical axis. Method of drip detector.
[6] When the light emitting element is referred to as a first light emitting element and the light receiving element is referred to as a first light receiving element,
One or more second light emitting elements disposed on the one side outside the infusion tube;
A plurality of second light receiving elements that are disposed on the opposite side of the one side outside the infusion tube and receive light emitted from the second light emitting elements;
The drop controller controls turning on and off of the second light emitting element;
The data processing unit receives an output voltage generated in the second light receiving element by receiving the light of the second light emitting element, detects the droplet based on the result of the output voltage, and The drip detector control method according to [4] or [5], wherein a droplet detection signal is output to a setting input unit / control unit of the pump body.
[7] The infusion detector according to any one of [1] to [3], and an infusion pump main body,
The infusion pump body is
A setting input unit / control unit into which the determination result of the type of infusion set by the data processing unit is input,
A tube pressing part for pressing the tube of the infusion set;
A motor for driving the tube pressing portion;
A motor drive unit that controls rotation of the motor in response to a stop signal or a rotation signal input from the setting input unit / control unit;
The setting input unit / control unit
The type of the infusion set determined by the data processing unit is compared with the type of the infusion set previously input to the setting input unit / control unit, and if both match, a rotation signal is sent to the motor drive unit. Is input, and if both do not match, the infusion pump inputs a stop signal to the motor drive unit.
[8] The drip detector includes a drip tube holding unit that holds the drip tube,
The output voltage of the light receiving element arranged closest to the inlet side of the drip tube of the drip tube holding part of the plurality of light receiving elements when the drip detector is mounted with a 20 drop drip set, When the optical axis is lower than that when only passing through the outer wall of the drip tube, the data processing unit sends an abnormal signal to the setting input unit / control unit of the infusion pump body,
The infusion pump according to [7], wherein the setting input unit / control unit inputs a stop signal to the motor drive unit when receiving the abnormality signal.
[9] When the light emitting element is referred to as a first light emitting element and the light receiving element is referred to as a first light receiving element,
One or more second light emitting elements disposed on the one side outside the infusion tube;
A plurality of second light receiving elements that are disposed on the opposite side of the one side outside the infusion tube and receive light emitted from the second light emitting elements;
The drop controller controls turning on and off of the second light emitting element;
The data processing unit receives an output voltage generated in the second light receiving element by receiving the light of the second light emitting element, and detects the droplet based on the result of the output voltage,
The setting input unit / control unit counts the number of droplet detection signals output from the data processing unit, converts the number of droplet detection signals into a flow rate, and the converted flow rate is the setting input unit / control unit. The infusion pump according to [7] or [8], wherein a stop signal is output to the motor drive unit when the normal flow rate setting range input to the unit is out of range.
[10] Further includes an alarm generation unit,
The setting input unit / control unit counts the number of droplet detection signals output from the data processing unit, converts the number of droplet detection signals into a flow rate, and the converted flow rate is the setting input unit / control unit. The infusion pump according to [9], wherein the alarm signal is output to the alarm generation unit when the normal flow rate setting range input to the unit is out of range.

  The present invention can be used in the medical field, particularly in infusion therapy. Especially, it can utilize preferably for the infusion therapy which needs to manage dosage strictly.

DESCRIPTION OF SYMBOLS 1 Infusion pump 2 Infusion detector 31 1st light emission part 32 2nd light emission part 31a 1st light emission element 32a-32e 2nd light emission element 41 1st light reception part 42 2nd light reception part 41a-41e 1st light reception element 42a-42g 1st 2 light receiving element 5 drip control unit 6 drip tube holding unit 7 data processing unit 8 drip tube 9 droplet 10 liquid supply tube 11 infusion bag 12 infusion pump body 13 setting input unit / control unit 14 alarm generation unit 15 motor control unit 16 Motor 17 Tube pressing portion 61 Inlet side 62 of drip tube holding portion Internal space 64 Back side of drip tube holding portion

Claims (10)

An infusion detector for outputting a detection signal of a droplet falling in an infusion tube to an infusion pump main body constituting an infusion pump,
One or more light emitting elements disposed on one side of the outside of the infusion tube;
A plurality of light receiving elements arranged on the opposite side of the one side outside the infusion tube and receiving light emitted from the light emitting elements;
A drip controller that controls turning on and off of the light emitting element;
An output voltage generated in each light receiving element by receiving the light of the light emitting element is transmitted, and based on the result of the output voltage, a type of infusion set is determined, and a data processing unit,
A plurality of optical axes respectively connecting the light emitting element and the plurality of light receiving elements are all in a single plane,
When the 60-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 60-drop infusion set depends on the mounting state of the drip tube to the drip detector. -1 or a,
When a 20-drop infusion set is mounted on the drip detector, the number of the optical axes blocked by the drip port of the 20-drop infusion set depends on the mounting state of the drip tube to the drip detector. The drip detector in which the light emitting element and the plurality of light receiving elements are arranged in a positional relationship of −1 or b.
However, the relationship of a <b-1 is satisfied, a and b are natural numbers, and a is 2 or more. The drip detector includes a drip tube holding unit that holds the drip tube,
The output voltage of the light receiving element arranged closest to the inlet side of the drip tube of the drip tube holding part of the plurality of light receiving elements when the drip detector is mounted with a 20 drop drip set, The data processing unit sends an abnormal signal to a setting input unit / control unit of the infusion pump main body when the optical axis is lower than that when only the outer wall of the infusion tube passes. Infusion detector. When the light emitting element is referred to as a first light emitting element and the light receiving element is referred to as a first light receiving element,
One or more second light emitting elements disposed on the one side outside the infusion tube;
A plurality of second light receiving elements that are disposed on the opposite side of the one side outside the infusion tube and receive light emitted from the second light emitting elements;
The plurality of optical axes that respectively connect the second light emitting element and the plurality of second light receiving elements each include a plurality of optical axes that respectively connect the first light emitting element and the plurality of first light receiving elements. In a single plane, separate from
The drop controller controls turning on and off of the second light emitting element;
The data processing unit receives an output voltage generated in the second light receiving element by receiving the light of the second light emitting element, detects the droplet based on the result of the output voltage, and The drip detector according to claim 1 or 2, wherein a droplet detection signal is output to a setting input unit / control unit of the pump body. A method for controlling an infusion detector according to claim 1, comprising:
The light emitting element is caused to emit light by the drop control unit,
Output the output voltage of each light receiving element generated by receiving light of the light emitting element to the data processing unit,
The drip detector control method, wherein the data processing unit determines the type of infusion set based on the result of the output voltage. The drip detector includes a drip tube holding unit that holds the drip tube,
The output voltage of the light receiving element arranged closest to the inlet side of the drip tube of the drip tube holding part of the plurality of light receiving elements when the drip detector is mounted with a 20 drop drip set, The data processing unit sends an abnormal signal to a setting input unit / control unit of the infusion pump main body when the optical axis is lower than that when only the outer wall of the infusion tube passes. Method for controlling the drip detector. When the light emitting element is referred to as a first light emitting element and the light receiving element is referred to as a first light receiving element,
One or more second light emitting elements disposed on the one side outside the infusion tube;
A plurality of second light receiving elements that are disposed on the opposite side of the one side outside the infusion tube and receive light emitted from the second light emitting elements;
The drop controller controls turning on and off of the second light emitting element;
The data processing unit receives an output voltage generated in the second light receiving element by receiving the light of the second light emitting element, detects the droplet based on the result of the output voltage, and The method of controlling an infusion detector according to claim 4 or 5, wherein a droplet detection signal is output to a setting input unit / control unit of the pump body. Including the drip detector according to any one of claims 1 to 3 and an infusion pump body;
The infusion pump body is
A setting input unit / control unit into which the determination result of the type of infusion set by the data processing unit is input,
A tube pressing part for pressing the tube of the infusion set;
A motor for driving the tube pressing portion;
A motor drive unit that controls rotation of the motor in response to a stop signal or a rotation signal input from the setting input unit / control unit;
The setting input unit / control unit
The type of the infusion set determined by the data processing unit is compared with the type of the infusion set previously input to the setting input unit / control unit, and if both match, a rotation signal is sent to the motor drive unit. Is input, and if both do not match, the infusion pump inputs a stop signal to the motor drive unit. The drip detector includes a drip tube holding unit that holds the drip tube,
The output voltage of the light receiving element arranged closest to the inlet side of the drip tube of the drip tube holding part of the plurality of light receiving elements when the drip detector is mounted with a 20 drop drip set, When the optical axis is lower than that when only passing through the outer wall of the drip tube, the data processing unit sends an abnormal signal to the setting input unit / control unit of the infusion pump body,
The infusion pump according to claim 7, wherein the setting input unit / control unit inputs a stop signal to the motor driving unit when receiving the abnormality signal. When the light emitting element is referred to as a first light emitting element and the light receiving element is referred to as a first light receiving element,
One or more second light emitting elements disposed on the one side outside the infusion tube;
A plurality of second light receiving elements that are disposed on the opposite side of the one side outside the infusion tube and receive light emitted from the second light emitting elements;
The drop controller controls turning on and off of the second light emitting element;
The data processing unit receives an output voltage generated in the second light receiving element by receiving the light of the second light emitting element, and detects the droplet based on the result of the output voltage,
The setting input unit / control unit counts the number of droplet detection signals output from the data processing unit, converts the number of droplet detection signals into a flow rate, and the converted flow rate is the setting input unit / control unit. The infusion pump according to claim 7 or 8, wherein a stop signal is output to the motor drive unit when the flow rate setting is not within a normal range previously input to the unit. Further including an alarm generation unit,
The setting input unit / control unit counts the number of droplet detection signals output from the data processing unit, converts the number of droplet detection signals into a flow rate, and the converted flow rate is the setting input unit / control unit. The infusion pump according to claim 9, wherein the alarm signal is output to the alarm generation unit when the flow rate setting is not within a normal range input in advance to the alarm unit.

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