WO2011115474A1 - Dispositif et procédé de réglage d'un débit d'un liquide s'écoulant dans un goutte-à-goutte - Google Patents

Dispositif et procédé de réglage d'un débit d'un liquide s'écoulant dans un goutte-à-goutte Download PDF

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Publication number
WO2011115474A1
WO2011115474A1 PCT/NL2010/000046 NL2010000046W WO2011115474A1 WO 2011115474 A1 WO2011115474 A1 WO 2011115474A1 NL 2010000046 W NL2010000046 W NL 2010000046W WO 2011115474 A1 WO2011115474 A1 WO 2011115474A1
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WO
WIPO (PCT)
Prior art keywords
flow rate
drip
frequency
liquid
signal
Prior art date
Application number
PCT/NL2010/000046
Other languages
English (en)
Inventor
Albert Johannes Van Der Pijl
Original Assignee
Dextermedical B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dextermedical B.V. filed Critical Dextermedical B.V.
Priority to PCT/NL2010/000046 priority Critical patent/WO2011115474A1/fr
Publication of WO2011115474A1 publication Critical patent/WO2011115474A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16886—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body for measuring fluid flow rate, i.e. flowmeters
    • A61M5/1689—Drip counters

Definitions

  • the invention relates to a device for setting a flow rate of liquid flowing through a drip.
  • Drips are applied as flow rate-determining element in for instance an infusion, but also in other applications, such as in titration.
  • the flow rate of an infusion can be precisely determined by applying an infusion with a cylinder and a mechanically driven piston. Although the flow rate of such an infusion can be set very accurately, the costs of such devices are high. In an infusion provided with an adjustable drip the accuracy is mediocre, this usually depending on the person carrying out the setting.
  • the object of the invention is to provide means with which the flow rate of a device provided with a drip can be set more accurately.
  • the device is adapted to generate at an adjustable frequency a repetitive signal discernible by human senses, the frequency of this signal being related to the frequency of the droplets in the drip at the desired flow rate.
  • the frequency of the drip can usually be set by a restriction in a part of the tube between container and drip which is situated upstream of the drip. This restriction is usually controlled with a slide. It is however difficult for a person operating the restriction to find the correct setting of the restriction. Setting is greatly simplified by providing a signal. The person first sets the frequency of the signal and then adjusts the restriction to a position such that the frequency of the falling droplets is the same as that of the signal.
  • the droplet size also depends on the form of the drip; microdrippers are for instance known which have a droplet size three to four times smaller than that of a normal drip. It will be apparent that the desired flow rate is calculated by dividing the quantity of liquid to be administered by the time duration within which this quantity must be administered.
  • the invention also relates to an associated method for setting the flow rate of liquid flowing through a drip, wherein the following steps are performed of: setting a frequency on a device adapted to generate at an adjustable frequency a repetitive signal discernible by human senses, discerning the signal and adjusting the drip until the frequency with which the droplets fall into the drip corresponds to the frequency of the droplets in the drip at the target flow rate.
  • the signal comprises a sound signal.
  • the signal preferably comprises a sound signal.
  • a sound signal is not only readily discernible, but when perceiving such a signal the user can use other senses for discerning the droplets. When perceiving the sound signals the user can thus see in very simple manner what the number of droplets per unit of time is.
  • Use of visually discernible signals is possible, but does require the light source to be placed in the vicinity of the drip. It is also possible to apply a combination of a visual and an auditory signal.
  • Another preferred embodiment provides the measure that the device is provided with selection means for selecting liquid data and the desired flow rate, and data-processing means for calculating the frequency of the signal on the basis of at least the selected liquid data and the selected flow rate.
  • the user hereby need not know the drip frequency of the droplets of the relevant liquid; only properties which are relevant to the droplet formation, such as viscosity, surface tension and density, need be selected. When use is made of drips with different properties this is preferably also entered and taken into account in the calculation.
  • the selection means can also be adapted to select the quantity of liquid and the time duration within which this quantity of liquid must be administered. The digital computer itself then calculates the desired flow rate.
  • This embodiment likewise provides a method in which the frequency is set by selecting properties of the liquid and selecting the flow rate.
  • the device comprises a memory in which names of liquids with associated data are stored, if the selection means are adapted to select the name of a liquid and the data-processing means are adapted to calculate the desired frequency from data of the selected liquid stored in the memory and the selected flow rate.
  • the nature of the drip is preferably also entered here.
  • This embodiment likewise provides a method in which properties of the liquid are selected by selecting the name of the liquid.
  • the frequency of the signal corresponds to the period of the frequency of the signal generated by the device. It cannot however be precluded that the frequency of the signal is for instance twice as high, which means that a droplet should fall at every second sound signal. It will be apparent that this is also possible at more than two sound signals, and that it is also possible for a sound signal to occur at every second droplet.
  • the device is thus preferably adapted to determine the frequency of a drip of an infusion.
  • the device is implemented in a handheld electronic computer such as a PDA or a mobile telephone. This is after all already provided with a computer, a memory, input or selection means and with means for generating a signal, both auditory and visual.
  • the above device relates only to setting of the flow rate, wherein a certain measure of inaccuracy cannot be prevented, particularly when the setting is carried out hastily and insufficient synchronization is achieved.
  • a preferred embodiment therefore provides the measure that the device is coupled to a measuring device for determining the flow rate of the drip. It is hereby possible to check for correct setting.
  • This embodiment likewise provides a method in which, after the flow rate of the drip has been set, the flow rate of the drip is measured and after a period of time a comparison is made as to whether the measured flow rate corresponds to the set flow rate.
  • the measuring device preferably comprises a weighing member for determining the weight of the quantity of liquid present in a container, this container being coupled to the drip whose flow rate must be set, coupling means for coupling the container to the weighing member, a computer coupled to the weighing member for calculating the flow rate of the liquid flowing through the drip, a memory connected to the computer for storing the values measured by the weighing member, and visual display means for displaying the flow rate of the liquid flowing through the drip calculated by the computer.
  • This embodiment likewise relates to a method in which the flow rate is measured by measuring the weight of a container from which the liquid is supplied to the drip and measuring the relevant weight after a period of time, and subsequently dividing the difference by the time duration between the two weight measurements.
  • the computer is adapted, depending on measured values stored in the memory, to disregard or take into account measured values originating from the weighing member. Because measured values lying outside predetermined limits are disregarded for further calculation, a flow rate can be calculated which is even more reliable. This is because highly deviating measured values lying outside predetermined limits entail a great risk of these values being unrealistic and for instance being caused by external factors, such as a movement of the device as a result of a disturbance. Such highly deviating measured values are excluded from the calculation by this measure. Because the user can for instance determine the limits him/herself, the device is flexible in use. According to this embodiment measured values lying outside predetermined limits are disregarded.
  • Figure 1 shows a diagram of the device according to the invention
  • Figure 2 is a perspective schematic view of a combination according to the present invention, which is also adapted to measure flow rate;
  • Figure 3 is a block diagram of the combination shown in figure 2.
  • Figure 4 is a perspective schematic view of an alternative embodiment.
  • Figure 1 shows a diagram of a device according to the invention.
  • This device designated as a whole with 30, comprises a computer 31 , an input member 32, for instance in the form of a keyboard or a 'touch screen', a memory 33, an oscillator 34, a loudspeaker 35 and a display 36.
  • the oscillator can otherwise be incorporated in computer 31.
  • the operation of the device is as follows: According to a simple embodiment, during input the desired frequency is entered into input member 32. This frequency is then for instance read from a table or from an specification on the packaging of the liquid to be dispensed. This frequency is fed to digital computer 32, which drives oscillator 34 at this frequency, from which oscillator the output signal is fed to the loudspeaker. It will be apparent that after a period of time computer 32 stops the signal to the oscillator and the signal no longer sounds from loudspeaker 35. It is of course also possible to use the input member to switch off the oscillator.
  • the user selects various values of significance to the droplet size, such as specific mass and viscosity and the nature of the drip, by means of input member 32, which can show a relevant options menu when formed by a touch screen.
  • input member 32 which can show a relevant options menu when formed by a touch screen.
  • These signals are then fed to digital computer 31, after which computer 31 retrieves from memory 33 the frequencies associated with these values and activates oscillator 34 at the relevant frequency.
  • the input member is formed by a keyboard, it is also attractive for a visual panel, 'display', to be present in order to visualize the menu. It will be apparent that instead of entering a desired flow rate it is likewise possible to enter a desired quantity of liquid to be administered and a time duration within which this liquid must be administered, preferably via a relevant options menu.
  • only the name of the. liquid to be administered need be entered into input member 32, after which digital computer 31 retrieves the relevant values of liquid properties or directly retrieves the frequency from the memory and activates oscillator 34 at the thus obtained frequency.
  • Such functions can be performed by a specific apparatus, it is attractive if they are performed by an apparatus that is already commercially available, such as a PDA or a 'smartphone'.
  • Such devices do after all already comprise a digital computer 31, an input member 32, a display 36, a memory 33 and a loudspeaker 35.
  • Such an apparatus also usually provides the option of communicating with other devices by means of 'Bluetooth' or other communication medium, as will be found important in the embodiment to be elucidated hereinbelow.
  • Figure 2 shows a device 1 for determining the quantity of liquid present in a container for medical use, such as an infusion bag 2, provided with a passage 2a for liquid, which can be closed by a tap (not shown).
  • Device 1 comprises a housing 3 to which coupling means in the form of a hook 4 are fixed via a weighing member (not shown in this drawing) embodied as weight sensor for the purpose of determining the weight of infusion bag 2.
  • the device also comprises a memory placed in the interior of housing 3, and therefore not shown in this drawing, for storing weight data, and a data-processing unit.
  • a display 5, a control panel 6 and a light source are situated on an outer side of housing 3.
  • the device further comprises fixation means (not shown in this drawing) for coupling device 1 to an infusion rod (not shown).
  • FIG 3 shows a block diagram which shows how the different components of the device of figure 1 are mutually connected.
  • Infusion bag 2 is releasably connected to hook 4.
  • Hook 4 is connected to weighing member 8, which is embodied for instance as a Hall sensor.
  • Weighing member 8 is connected to data-processing unit 10.
  • Display 5, control panel 6, signalling means embodied as a LED 7 and memory 9 are likewise connected to data-processing unit 10. It is noted here that the signalling means can also comprise a beeper or other auditory signalling member.
  • Display 5, control panel 6, LED 7, weighing member 8, memory 9 and data-processing unit 10 are also connected to battery 12 in order to obtain the required energy.
  • This battery is preferably formed by a rechargeable battery, but can also be formed by a non-rechargeable battery.
  • a power supply circuit connectable to the mains can be applied instead of a battery.
  • the device operates as follows. Once an infusion bag 2 has been coupled to hook 4, weighing member 8 measures the weight of infusion bag 2 and generates an associated signal. This signal representing the measured weight is stored in memory 9. Data- processing unit 10 can be operated by means of control panel 6 such that the flow rate is determined on the basis of weight data stored in memory 9. In order to determine a flow rate a user at least partially opens the tap, whereby liquid flows out of infusion bag 2 through passage 2a. Weighing member 8 measures the weight of the infusion bag at a frequency of 1 Hz, after which the signals representing these values are transmitted to data-processing unit 10 and stored in memory 9.
  • Data- processing unit 10 calculates the flow rate on the basis of data stored in memory 9 by the user relating to the specific mass of the liquid entered beforehand into the memory, the difference in weights of infusion bag 2 measured at at least two mutually differing times, and the time difference between these times. This is then displayed on display 5. On the basis of the displayed flow rate the user can open the tap further or partially close it if the value of the displayed flow rate lies respectively below or above the value desired by the user.
  • control panel 6 Making use of control panel 6 the user can enter the desired quantity of liquid to flow out of infusion bag 2, after which data-processing unit 10 determines and displays on display 5 the time remaining on the basis of the weight of infusion bag 2, the
  • Examples of further reference data are: the initial weight of infusion bag 2, the weight of infusion bag 2 after a quantity of liquid has flowed through passage 2a, the quantity of liquid which has flowed through the passage, the time duration before the desired quantity of liquid has flowed through passage 2a (time remaining), a lower limit and upper limit of the flow rate of the liquid, and so on. If a value determined by device 1 now differs from the lower limit or upper limit set by the user, data-processing unit 10 will activate the blue LED 7 such that it begins to flash.
  • the device can optionally be adapted such that LED 7 then first generates a signal if the determined flow rate differs from the lower or upper limit by more than a value preset by a user. This can optionally be accompanied by a sound signal, for which purpose the signal means are provided with a loudspeaker.
  • Device 1 can also be adapted such that it generates a signal to a central monitoring system (not shown).
  • the combination of a measuring device as described above and the device for setting the flow rate of a liquid flowing through a drip is attractive for setting the drip.
  • the advantages increase when the measuring device is connected to the setting device so that the results of the measuring device can be used to modify the frequency in order to achieve a greater accuracy. It will otherwise be apparent that the measuring device can also be used on its own.

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  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

La présente invention concerne un dispositif de réglage du débit d'un liquide s'écoulant dans un goutte-à-goutte, qui est adapté pour générer à une fréquence ajustable un signal répétitif pouvant être discerné par les sens humains, la fréquence de ce signal étant liée à la fréquence des gouttelettes dans le goutte-à-goutte au débit souhaité. Si l'on suppose que la taille des gouttelettes du goutte-à-goutte ne varie pas, la fréquence avec laquelle les gouttelettes tombent est une bonne mesure du débit. La fréquence du goutte-à-goutte est réglée par une restriction dans une partie du tube entre le récipient et le goutte-à-goutte qui se trouve en amont du goutte-à-goutte. Un individu règle d'abord la fréquence du signal, puis la restriction dans une position telle que la fréquence des gouttelettes qui tombent soit la même que celle du signal.
PCT/NL2010/000046 2010-03-17 2010-03-17 Dispositif et procédé de réglage d'un débit d'un liquide s'écoulant dans un goutte-à-goutte WO2011115474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/NL2010/000046 WO2011115474A1 (fr) 2010-03-17 2010-03-17 Dispositif et procédé de réglage d'un débit d'un liquide s'écoulant dans un goutte-à-goutte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2010/000046 WO2011115474A1 (fr) 2010-03-17 2010-03-17 Dispositif et procédé de réglage d'un débit d'un liquide s'écoulant dans un goutte-à-goutte

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WO2011115474A1 true WO2011115474A1 (fr) 2011-09-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102553022A (zh) * 2012-02-13 2012-07-11 广东步步高电子工业有限公司 一种可进行输液滴速检测、输液时间预估及提醒的手机系统
US9199036B2 (en) 2013-02-25 2015-12-01 Shift Labs, Inc. Device, method, and system for monitoring the delivery of fluids through a drip chamber
US11464905B2 (en) 2013-02-25 2022-10-11 Shift Labs, Inc. Monitoring device including an emitter emitting electromagnetic radiation and a detector positioned to receive the radiation to determine one or more rolling average flow rates

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7612261A (nl) * 1975-11-05 1977-05-09 Clin Midy Debietregelaar.
US4038982A (en) * 1975-12-03 1977-08-02 Burron Medical Products, Inc. Electrically controlled intravenous infusion set
EP0100682A1 (fr) * 1982-08-03 1984-02-15 Peritronic Medical Industries Plc Procédé et appareil de commande du débit d'un fluide
US4509943A (en) * 1981-08-10 1985-04-09 Terumo Kabushiki Kaisha Infusion control apparatus
NL8303389A (nl) * 1983-10-03 1985-05-01 Continental Pharma B V Inrichting voor het instellen van een herhalingsfrequentie van een zintuigelijk waarneembaar verschijnsel.
EP0286221A1 (fr) * 1987-02-27 1988-10-12 Shimadzu Corporation Appareil de commande du débit de perfusion
US4778450A (en) * 1979-07-12 1988-10-18 Baxter Travenol Laboratories, Inc. Fluid flow control system
US4976687A (en) * 1987-05-11 1990-12-11 James Martin Apparatus for controlling the supplying of intravenous fluids
US5045069A (en) * 1989-01-17 1991-09-03 Robert Imparato Portable infusion monitor
WO2003022127A2 (fr) * 2001-09-07 2003-03-20 Citrenbaum Richard A Appareil et procede de suivi de perfusion
WO2007148912A1 (fr) * 2006-06-19 2007-12-27 Jae Sang Park appareil d'émission et de vérification de signaux de commande pour un écoulement de fluide vers un patient

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7612261A (nl) * 1975-11-05 1977-05-09 Clin Midy Debietregelaar.
US4038982A (en) * 1975-12-03 1977-08-02 Burron Medical Products, Inc. Electrically controlled intravenous infusion set
US4778450A (en) * 1979-07-12 1988-10-18 Baxter Travenol Laboratories, Inc. Fluid flow control system
US4509943A (en) * 1981-08-10 1985-04-09 Terumo Kabushiki Kaisha Infusion control apparatus
EP0100682A1 (fr) * 1982-08-03 1984-02-15 Peritronic Medical Industries Plc Procédé et appareil de commande du débit d'un fluide
NL8303389A (nl) * 1983-10-03 1985-05-01 Continental Pharma B V Inrichting voor het instellen van een herhalingsfrequentie van een zintuigelijk waarneembaar verschijnsel.
EP0286221A1 (fr) * 1987-02-27 1988-10-12 Shimadzu Corporation Appareil de commande du débit de perfusion
US4976687A (en) * 1987-05-11 1990-12-11 James Martin Apparatus for controlling the supplying of intravenous fluids
US5045069A (en) * 1989-01-17 1991-09-03 Robert Imparato Portable infusion monitor
WO2003022127A2 (fr) * 2001-09-07 2003-03-20 Citrenbaum Richard A Appareil et procede de suivi de perfusion
WO2007148912A1 (fr) * 2006-06-19 2007-12-27 Jae Sang Park appareil d'émission et de vérification de signaux de commande pour un écoulement de fluide vers un patient

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102553022A (zh) * 2012-02-13 2012-07-11 广东步步高电子工业有限公司 一种可进行输液滴速检测、输液时间预估及提醒的手机系统
US9199036B2 (en) 2013-02-25 2015-12-01 Shift Labs, Inc. Device, method, and system for monitoring the delivery of fluids through a drip chamber
US11464905B2 (en) 2013-02-25 2022-10-11 Shift Labs, Inc. Monitoring device including an emitter emitting electromagnetic radiation and a detector positioned to receive the radiation to determine one or more rolling average flow rates

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