JP3185064U - Infusion pump - Google Patents

Abstract

An infusion pump for automatically discriminating a mounted 20 drops / ml infusion set and a 60 drops / ml infusion set to prevent an operator from making a setting error is provided.
SOLUTION: The diameters of drip ports (nozzles) in drip tubes attached to 20 drops / ml infusion set 10 and 60 drops / ml infusion set 11 are different from each other. A light-emitting element 23 and a light-receiving element 24 are attached to positions facing each other across the tube, and the light-receiving element measures the state where the light from the light-emitting element is blocked by the drip mouth in the drip tube, so that two types of infusion sets can be distinguished It was.
[Selection] Figure 3

Description

  The present invention relates to an infusion pump having a function capable of automatically discriminating the type of infusion set to be used.

  An infusion pump is widely used in the medical field as a device that can accurately and continuously infuse a medical solution or the like. At that time, the infusion set attached to the infusion pump is a sterilized disposable product, and an infusion tube is provided at the inlet of the infusion set so that the flow rate can be visually confirmed. There are mainly two types of infusion pump flow rate control methods. One infusion rate control type infusion pump measures the number of infusions per unit time when the infusion tube drops (drops), and feedback controls the pump speed. ing. There is a volume control type infusion pump as another control method, and the flow rate is controlled by keeping the pump speed constant according to the characteristics of the infusion set.

There are two types of infusion sets used for infusion pumps: one for general infusions with a 20 drops / mL infusion tube and one for precision infusions with a 60 drops / mL infusion tube. Yes. A 20 drop / mL drip tube is equipped with a drip mouth (nozzle) that drops 20 drops per mL, and a 60 drip / mL drip tube that drops 60 drops per mL (nozzle) Nozzle). As described above, there are two types of infusion sets, and therefore, there is a difference in the number of infusions per hour even at the same flow rate.

For infusion rate controlled infusion pumps, to control the number of drops per unit time, it is important to determine whether to use a 20 drops / mL infusion set or a 60 drops / mL infusion set. It becomes a condition.

Some capacity-controlled infusion pumps measure the number of infusions in order to confirm the safety of the flow rate. In that case, it is necessary to select an infusion set. In this way, setting which of the two types of infusion sets to use for the infusion pump is an important matter for ensuring a correct flow rate.

However, in the current infusion pump, there is no method other than the user setting the type of infusion set to the infusion pump, and the infusion pump does not have a function for automatic determination. For this reason, there are cases where flow rate abnormalities and false alarms occur due to incorrect settings of the infusion set, causing medical errors.

In order to eliminate such an erroneous setting, some infusion pumps have a function of counting the number of infusions during infusion and generating an alarm and distinguishing when the number deviates from the value assumed in each infusion set. However, depending on the chemical solution to be infused, the volume of the droplet changes due to the surface activity of the chemical solution, and as a result, the number of infusions changes, and there is a chemical solution that reaches an unexpected number of drops. The anti-cancer drugs that are frequently used recently have the same properties, so if an alarm is generated despite normal settings, the function of issuing an alarm that is not expected is an obstacle to use. There is.

In Patent Document 1, it is not necessary to distinguish between 20 drops / mL and 60 drops / mL infusion tubes because the size of the instilled infusion is measured by an image sensor and the drop volume is calculated. However, there remains a problem in that it becomes a discrimination after the start of infusion and the system is complicated.

JP 2011-62371 A

  The problem to be solved is that the type of infusion set attached to the infusion pump (20 drops / mL infusion set and 60 drops / mL infusion set) and the type of infusion set set by the user for the infusion pump are incorrect. This is the point that causes abnormal flow and false alarms.

  This invention pays attention to the instillation nozzle (nozzle) in the infusion cylinder of two types of 20 drops / mL infusion set and 60 drops / mL infusion set, and the two kinds of infusion are different because the diameters of the infusion ports (nozzles) are different. The most important feature is that it is an infusion pump with a sensor that identifies the set.

  According to the present invention, when the infusion set is attached to the infusion pump, the infusion pump automatically discriminates the infusion set, so that subsequent setting by the user becomes unnecessary. Or, when the function set by the user is left, it is possible to double check the user's set value and the infusion set determined by the infusion pump. This eliminates a medical error due to an infusion set setting error.

FIG. 1 is an operation explanatory diagram showing the flow of control of the infusion pump. FIG. 2 is a diagram in which an infusion set is attached to an infusion pump and a drop detector for automatic infusion set discrimination is mounted. FIG. 3 is a view showing the drip tube shape of two types of infusion sets and the detection heights of the light emitting element and the light receiving element. FIG. 4 is a horizontal sectional view of the detection position of FIG. 3, and is an explanatory view of a light emitting element and a light receiving element arranged for automatically discriminating the drip mouth (nozzle). Example 1 FIG. 5 is an explanatory diagram of the light receiving element output voltage for discriminating the drip mouth (nozzle). Example 1 FIG. 6 is an explanatory diagram when the number of light receiving elements and the number of light emitting elements are switched. (Example 2) FIG. 7 is an explanatory diagram for discriminating the drip mouth (nozzle) at a level for receiving light with the light receiving element surface wide. (Example 3)

  The light emitting element 23 and the light receiving element 24 facing the position of the height 15 of the drip tube 12 are arranged, and the light receiving element 24 detects the state where the light emitted from the light emitting element 23 is blocked by the drip mouth (nozzle), It became possible to distinguish between two types of drip mouths (nozzles) and to distinguish infusion sets.

  The shape of the drip tube is different between the 20 drops / mL infusion set 10 and the 60 drops / mL infusion set 11 as shown in FIG. 3, and the outer diameter of the 20 drops / mL infusion port (nozzle) 13 is about φ4 mm, 60 drops / mL. The outer shape of the drip mouth (nozzle) 14 is about φ1 mm.

In FIG. 3, the light emitting element 23 and the light receiving element 24 are arranged at a position facing each other at a height 15 passing through the 20 drop / mL drop opening and the 60 drop / mL drop opening of the drop tube. Three 28, 29, 30 are arranged in a horizontal position with respect to the cross section.

The light receiving element 29 is arranged at a position 29 where the optical axis 21 is blocked by the 60 drops / mL drip inlet, and the light receiving elements 28 and 30 are arranged at positions where the optical axes 20 and 22 are blocked by only the 20 drops / mL drip inlet.

  With this arrangement (FIG. 4), when the infusion tube is not attached, the light 20, 21 and 22 of the light emitting element reaches all the light receiving elements 28, 29 and 30, and the infusion tube of 60 drops / mL is attached. In this case, the light reaches the light receiving elements 28 and 30. When a 20 drop / mL drip tube is attached, all 28, 29 and 30 light receiving elements are shielded from light. Therefore, in each case, it is classified into the light receiving element output voltage of FIG.

  The classification is shown in Table 1, and the type of infusion set can be identified.

  The control of the infusion pump will be described with reference to FIG. The voltage received by the drip-opening light receiving unit 41 enters the infusion set detection unit / drop detection unit 43 to determine the infusion set. The discriminated signal is compared with the infusion set set 45 by the operator in the set value input unit / control unit 44, and when both match, a motor drive signal suitable for the infusion set is given to the motor drive unit 46, The motor 47 is driven to operate the liquid loading unit 48.

The signal received by the drop receiving unit 42 is determined and measured as a drop by the infusion set detection unit / drop detection unit 43, and the value of the infusion set determined by the set value input unit / control unit 44. In comparison, if the number of infusions per hour becomes unexpected, an alarm is generated by the alarm generator 49 and the pump is stopped.

  The embodiment in FIG. 6 is a case where the number of light emitting elements and the number of light receiving elements are interchanged. As in the first embodiment, the instillation port (nozzle) shields the optical axis so that 20 drops / mL drip set and 60 drops / Judgment can be made based on the difference in the light receiving element output voltage when the mL drip set is installed.

  The embodiment of FIG. 7 is a method for discriminating between a 20 drop / mL infusion set and a 60 / mL infusion set based on the output voltage of the light receiving side element using the amount of light shielded by the drip mouth (nozzle).

If the infusion pump has a function that can automatically discriminate between 20 drops / mL and 60 drops / mL of the infusion set to be used, a setting error by the user is detected before the infusion is started, a warning is given, and safe infusion is performed. Can be provided to patients.

1 Infusion set discrimination sensor 2 Infusion set (infusion tube)
3 Infusion pump 4 Display unit 5 Set value input unit 10 20 drops / mL infusion set 11 60 drops / mL infusion set 12 Infusion tube 13 20 drops / mL infusion port (nozzle)
14 60 drops / mL Inlet (nozzle)
15 Light emitting / receiving element mounting height 20 Optical axis (20 drops / mL for drip mouth detection 1)
21 Optical axis (for detecting 60 drops / mL drip mouth)
22 Optical axis (20 drops / mL for drip mouth detection 2)
23 Light-Emitting Element 24 Light-Receiving Element 25 20 Drops / mL Drip Port 26 60 Drops / mL Drip Port 27 Drip Tubes 28, 29, 30 Light-Receiving Element 40 Light-Emitting Unit 41 Drip-Port Light-Receiving Unit 42 Drip-receiving Unit 43 Infusion Set Detection Unit / Drop Drop detection unit 44 Setting value input unit / control unit 45 Pump setting item input 46 Motor drive unit 47 Motor 48 Liquid loading unit 49 Alarm generation unit

Claims (2)

  It has a function to judge whether 20 drops / mL infusion set or 60 drops / infusion set is installed, and it has the function to make the setting of the infusion set unnecessary or to compare with the infusion set set by the user. Infusion pump characterized by.   The function to determine whether 20 drops / mL infusion set or 60 drops / infusion set is installed is an infusion pump realized by measuring the diameter of the drip mouth in the drip tube and measuring the degree of light shielding.