NL2002338C2 - Device and method for determining the quantity in a holder having a holder, which holder is coupled with feed-out lines for feeding and disposing the liquid and a dosing device. - Google Patents

Device and method for determining the quantity in a holder having a holder, which holder is coupled with feed-out lines for feeding and disposing the liquid and a dosing device. Download PDF

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Publication number
NL2002338C2
NL2002338C2 NL2002338A NL2002338A NL2002338C2 NL 2002338 C2 NL2002338 C2 NL 2002338C2 NL 2002338 A NL2002338 A NL 2002338A NL 2002338 A NL2002338 A NL 2002338A NL 2002338 C2 NL2002338 C2 NL 2002338C2
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Netherlands
Prior art keywords
device
liquid
weight
characterized
holder
Prior art date
Application number
NL2002338A
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Dutch (nl)
Inventor
Albert Johan Pijl
Wilhelmina Aleida Jacoba Das
Elmar Jacobus Everardus Jongerius
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Jamla Investments
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Priority to NL2002338 priority Critical
Priority to NL2002338A priority patent/NL2002338C2/en
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Publication of NL2002338C2 publication Critical patent/NL2002338C2/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168Means 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
    • A61M5/16831Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • A61M5/1684Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
    • A61M5/16845Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion by weight
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168Means 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
    • A61M5/16886Means 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
    • A61M5/16895Means 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 by monitoring weight change, e.g. of infusion container
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F19/00Digital computing or data processing equipment or methods, specially adapted for specific applications
    • G06F19/30Medical informatics, i.e. computer-based analysis or dissemination of patient or disease data
    • G06F19/34Computer-assisted medical diagnosis or treatment, e.g. computerised prescription or delivery of medication or diets, computerised local control of medical devices, medical expert systems or telemedicine
    • G06F19/3456Computer-assisted prescription or delivery of medication, e.g. prescription filling or compliance checking
    • G06F19/3468Computer-assisted delivery of medication via infusion or injection
    • GPHYSICS
    • G16INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16HHEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H40/00ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices
    • G16H40/60ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the operation of medical equipment or devices
    • G16H40/63ICT specially adapted for the management or administration of healthcare resources or facilities; ICT specially adapted for the management or operation of medical equipment or devices for the operation of medical equipment or devices for local operation

Description

Device and method for determining the amount of liquid present in a container, which container is coupled to feed-through means for supplying or discharging the liquid and a dosing device to a human or animal.

The present invention relates to a device and a method for determining the amount of liquid present in a holder, which holder is coupled to feed-through means for supplying or discharging the liquid to a human or animal and to a dosing device connected to such a device.

Devices for determining the amount of liquid present in a container, which container is coupled to transit means for supplying or discharging the fluid to a human or animal are used in large numbers in hospitals or similar medical-oriented institutions. Examples of such devices are infusion systems for administering an animal or person to a fluid or devices for receiving urine secreted by an animal or person. For this purpose such devices generally comprise coupling means for coupling the holder to the device, a weight measuring device connected to the coupling means for measuring the weight of the holder, a data processing unit coupled to the weight measuring device, a memory for the data processing unit connected to the data processing unit. storing the values measured by the weight measuring device, and visual display means for displaying data calculated by the data processing unit, such as the current weight of the container.

The disadvantage of these known devices is that a user, for example a nurse, is not immediately informed by the device about the flow of the liquid flowing in or out of the container. This is an important value in particular when a liquid is supplied, such as with an infusion. In use, the device is regularly checked during use, that is to say within a short period of time, to determine the flow rate and thus prevent dangerous situations.

However, due to distraction of the nurse as a result of other activities, there is a risk of leaving the device or even not checking it at all, which further increases the chance of a dangerous situation.

2

The object of the present invention is to provide an improved device and an improved method for determining the weight of a container for medical use provided with a passage for liquid, wherein during the use of the device the risk of hazardous situations is at least is reduced.

5

To this end, the invention provides a device of the above-mentioned type wherein the data-processing unit is adapted to calculate the flow rate of the liquid flowing through the feed-through means and that the visual display means are arranged to display the flow rate of the through-feed means. liquid flowing out.

Because the flow rate of liquid flowing through the feed means of a container coupled to the device is determined and displayed, the nursing staff can accurately determine the flow rate so that the risk of dangerous or undesirable situations for the patient is reduced. After all, because the user, such as the nursing staff, is informed about the flow of the liquid flowing in or out of the container, the user can check whether the desired value of the flow is met. In particular if a long-term infusion is administered to a patient, this may reduce the risk of administering, for example, a medicine with a too high or too low flow.

Furthermore, a good estimate can be made of the time at which the device must be checked again, whereby on the one hand the user does not check the device unnecessarily often and on the other hand does not pass such a long period between two checks that there is an increased risk of a dangerous situation arises.

The same advantages are obtained with a method for determining the amount of liquid in a container, which is coupled to a human or animal through a passage of the liquid, comprising the steps of: measuring the weight of the liquid at a first time. container, allowing a liquid to flow through the passage, measuring the weight of the container at at least one second time known to the first point in time, and storing the measured values thus obtained in a memory, characterized in that the flow rate of the liquid flowing through the feed-through is determined from the measured values thus obtained and the time period 3 between the times at which they were obtained.

According to a first preferred embodiment, the device comprises second coupling means for coupling a second holder to the device, a second weight measuring device connected to the second coupling means and the memory, for measuring the weight of the second holder, the data-processing unit is adapted to calculate the flow rate of the liquid flowing through the feed-through means of the second holder and the visual display means are arranged for displaying the flow of the liquid flowing through the feed-through means of the second holder. As a result, the flow rate of liquid flowing through the passage means of two containers coupled to the device can be determined and displayed. For example, the first container may contain a physiological saline solution and the second container may contain a solution with a medicine. A user can then accurately determine the flow rate of both fluids and check whether they meet the desired values of the flow rate of the two fluids.

In another embodiment, the data-processing unit is adapted to ignore or take into account, depending on measured values stored in the memory, measured values originating from the weight measuring device. This can increase the reliability of the determined flow. The measured values measured by the weight measuring device are after all subject to strong fluctuations, for example as a result of swinging of the container, often designed as a bag. After all, in this embodiment the data-processing unit can ignore strongly deviating values caused by coincidences for calculating the flow, whereby the determined and thus displayed flow to a user fluctuates less and the displayed value thereof becomes more reliable.

According to this embodiment, depending on the measured values stored in the memory 30, measured values originating from the weight measuring device are ignored or taken into account.

In particular, the data processing unit is adapted to ignore measurement values located outside predetermined limits for further calculation. Because 4 measured values located outside predetermined limits are ignored for further calculation, a flow rate can be calculated that is even more reliable. Indeed, there is a great risk of widely differing measured values located outside predetermined limits that these values are unrealistic and come, for example, from external factors, such as a movement of the device as a result of a disturbance. Such greatly deviating measurement values are excluded from the calculation by this measure. Because, for example, the user can determine the limits himself, the device is flexible in use. According to this embodiment, measured values outside predetermined limits are ignored.

10

In another embodiment, the data processing unit is adapted to select a representative measurement value, such as an average or a median of the group of measurement values, for further calculation from a group of successive measurements from the weight measuring device. By using representative values, an improved determination of the flow is obtained. Any weight data that differs greatly from other weight data is hereby filtered with respect to other weight data. Further stability of the measured values is achieved by these measures. This embodiment further provides the measure that for calculation from a group of successive measured values originating from the weight measuring device, a representative measured value, such as an average or a median of the group of measured values, is used.

In a further embodiment the memory is provided with reference data and the data processing unit and the visual display means are adapted to display at least one of the quantities selected from the group consisting of: the initial weight of the liquid-filled container, the weight of the liquid container, after a quantity of liquid has flowed into or out of the container, the quantity of liquid flowing into or out of the container, the flow rate of the liquid flowing into or out of the container, a value of the value to be set by a user The desired amount of liquid to flow through the feed-through, and the period of time before the liquid still present in the holder has flowed out of the holder or the holder has been filled with liquid flowing in the holder and the device is provided with operable selection means for choosing the greatness to display. A user is thus offered the option of directly reading this data, so that the user can take immediate measures. This makes the device more efficient to use. Thus, a user is alerted if, for example, he has coupled a holder with a weight deviating from the desired initial weight to the device. The deviating initial weight of the container with liquid is displayed on which the user can take immediate measures, such as checking the contents of the container or the density of the container. Also, the initial weight in conjunction with the flow rate determined by the device and a value to be set by a user of the desired amount of liquid to flow through the feed-through can be used to determine and display the time duration before the desired amount is reached. amount of liquid has flowed through the feed-through, this time period is also called residual time. For example, the weight of the container after an amount of fluid has flowed through the bushing can be used to determine when the container needs to be replaced, while the amount of fluid flowing through the bushing can just be used to determine how much of, for example, a desired Drug has been administered to the patient. According to this embodiment, the method comprises the step of storing quantities in a memory selected from the group consisting of: a desired amount of liquid to flow through the passage, a lower limit of the weight of the liquid container, an upper limit of the weight of the container with liquid, a desired flow rate of the liquid, and a lower limit and upper limit of the desired flow rate of the liquid, the method also comprising the step of displaying a quantity selected from this group.

In yet another embodiment, the device is adapted to issue an auditory signal in dependence on the outcome of a comparison of weight data of the holder with reference data. As a result, a user who is remote from the device can be alarmed if weight data determined by the device deviate, preferably a minimum value set at least by the user deviates from limits set by the user. If, for example, a value to be set by a user of the desired amount of liquid to flow through the passage has been reached, with which the residual time has been given the value zero, a signal can be issued. The user can then respond, for example by disconnecting the infusion, or by placing a new container filled with liquid.

6

The signal means can also be adapted to provide a light signal, a vibrating signal or a combination of such signals. The light signal can for instance be emitted by using a light-emitting diode (LED) illumination, and preferably an LED with a blue color. A blue color differs from the usual colors for issuing a signal, so that the alarming effect is large.

In particular, the device is adapted to deliver a signal to a central monitoring device. This allows remote users to be easily informed through the intervention of the central monitoring device. This measure can be used to advantage in larger settings in particular.

The values of the different weight data can be displayed in various ways, such as for example on the basis of the number of lit lamps, the length of a tone and so on. In particular, the indication means comprise an alpha-numeric display. The value of the weight data can thus be displayed in a very simple manner and can be read by a user. The display can advantageously be designed as a "liquid crystal display" 20 (LCD). A clear display clearly shows information and uses little electrical energy. In particular, the display is designed as a touchscreen. Such a display is not only easy to use, it is also easy to keep clean.

The device can be embodied in various ways, but often the device comprises a housing and the coupling means are adapted to position the holder in a position in which it is at least partially enclosed by wall parts of the housing. Because the holder coupled to the device is at least partially enclosed by wall parts of the housing, the movement of the holder is limited. In the case of any disruptions that could occur during the determination of weight data, for instance because a patient bumps into the device or causes it to move in a different way, the wall parts of the housing will limit the movement of the holder, whereby the measurement can be determined more reliably by the device.

7

For a further improvement in determining weight data, the device comprises positioning means for maintaining at least a part of the bushing at a substantially fixed position relative to the device. As a result, the weight of the transit is not included in the determination of the weight of the container.

Furthermore, these positioning means limit the movements of the holder.

The device preferably comprises fixing means for fixing the device to a frame, such as an infusion standard, wherein the fixing means are preferably adapted to adjust the angular position of the device relative to the frame. The measurement results are after all strongly dependent on the angle at which the weight of the holder pulls on the coupling means.

The weight data can be detected in various ways. In particular, the weight measuring device comprises a weight sensor, which weight sensor comprises a component selected from the group consisting of: a Hall sensor, a spring unit with an electronic displacement sensor, a strain gauge, a piezoelectric sensor, a piezo-resistive sensor and a thin film transmitter. Such weight sensors can be small, reliable and inexpensive.

20

It is also advantageous to provide the weight measuring device with means for limiting the risk of damage to the weight measuring device as a result of the excessively high load applied to the weight measuring device. The reliability of the device can hereby increase. High load is herein understood to mean a load that is well above the load as a result of a liquid-filled container coupled to the weight measuring device, such as an infusion bag filled with a liquid. In particular, such security means comprise a stop against which a displaceable part of the weight-measuring member or of the coupling means presses, if a previously known maximized load is applied to the weight-measuring member. A load greater than the maximum load is in this case not absorbed by the weight measuring device, but by the stop and this, for example, is introduced into a housing of the weight measuring device.

8

The device may further be adapted to provide a signal which can be repeatedly perceived by human senses at an adjustable time interval. This measure is particularly important for initially setting up a flow-determining device in which the flow depends on a periodically occurring event, such as the drop of a drop, such as with a dropper. The desired flow rate is set on the device, which, depending on the nature of the liquid, determines the frequency of the periodic signal, which has a relationship with the periodically occurring event, such as the frequency of the drops falling. The user then observes the signal and sets the flow regulator 10 so that the frequency of the falling drops corresponds to the frequency of the signal. This avoids estimates-based settings, so that the initial value of the flow does not deviate too much from the desired flow.

The device is then used to determine the actual flow rate, with which the setting of the flow rate determining device can be corrected.

Although this embodiment is preferably used in integrated form with the device for determining the flow, it can also be used alone, for example in situations where a less accurate adjustment of the flow is sufficient,

Although visually perceptible signals such as illuminated LEDs are not excluded, the signal is in particular an audio signal. Such a signal is not only easily perceptible, but during the perception of such an audio signal the user can very easily use other senses for detecting the drops. In this way, the user can very easily see the number of drops per unit of time while observing audio signals. Use of visually observable signals is possible, but requires that the light source is placed in the vicinity of the dropper. It is also possible to apply these measures separately.

It is pointed out that the above-mentioned embodiment is suitable for adjusting the flow rate and less for measuring the flow rate. This embodiment can therefore also be used on its own. Hereby only those parts 9 that are necessary for fulfilling this function, such as an electronic computer with an adjustable pulse generator and control means, need be present. A separate unit can thus be provided which can be adapted to be attached to a carrier for an infusion bag such as an infusion pole.

5

However, it is also possible to use this embodiment, as indicated above, in combination with a device according to the preceding claims of this patent application. In this case, the adjusting device can be used to set an initial value of the flow and the main device can then be used to measure the actual flow. If this measured flow rate deviates from the desired flow rate, then the flow rate determining device is adjusted.

In an advantageous embodiment, the device comprises selection means for selecting liquid data belonging to at least one liquid data stored in the memory and the data processing unit is adapted to calculate a desired flow rate input by a user at least on the basis of the selected liquid data of the desired time interval. Because a user can select a liquid which is located in the holder, the device can use the liquid data belonging to this liquid for calculating the time interval. The time interval thus calculated can be a measure of the desired flow rate, whereby the user can adjust the flow rate of repeatedly emitted signal on the basis of the calculated time interval. In particular, the fluid data includes data regarding the density, viscosity, and surface tension of the fluid.

25

According to another preferred embodiment, the device comprises selection means for selecting the name of a liquid and that the data-processing device is adapted to calculate the desired time interval from data stored in the memory and the desired flow rate. Operation is hereby greatly facilitated; after all, a user only needs to enter the name of the fluid to be administered, such as "physiological saline solution", after which the device automatically selects the data of the fluid in question and uses it to calculate the interval.

10

In a further advantageous embodiment, the calculated time interval substantially corresponds to the time interval between two drops of liquid moving during operation in the transit means. This made a direct link with the flow rate and the time interval. By comparing the sound signals with the number of drops per unit of time, the user can accurately set a desired flow rate in a simple manner.

The embodiments described above all relate to a device for measuring or determining the flow, and in the last embodiments to the initial adjustment of the flow. The presence of a signal representing the value of the flow rate also offers the possibility of building a control circuit. To this end, an alternative embodiment provides a device provided with a control circuit for outputting a control signal which is dependent on the result of the comparison of a desired flow rate and the determined flow rate. By these measures, the device can be further automated by using the control signal and using this signal to adjust the flow.

The invention also relates to a dosing device, comprising a device for determining the amount of liquid present in a holder, which holder is coupled to feed-through means for supplying the liquid to a person or animal and a dosing device provided with a control circuit for outputting a control signal which is dependent on the result of the comparison of a desired flow rate and the determined flow rate according to the present invention and a flow determining device placed in the feed-through, which is coupled to the control circuit for outputting the control signal to the flow determining device. A device is hereby obtained which operates automatically and accurately. For example, during the administration of an infusion this dosing device can be used with advantage. If, during the administration of the infusion, the determined flow rate deviates from the desired value of the flow rate (the target value), a signal can be supplied to the flow rate determination device, after which the flow rate determination device can adjust the flow rate on the basis of the signal, 11

The control circuit preferably outputs a signal if the value of the determined flow deviates more than a desired value predetermined by a user from the flow. The flow-determining device preferably adjusts the flow so that the absolute value of the adjustment of the flow is smaller than the difference between the determined flow and the desired value of the flow. The flow-determining device can also adjust the flow so that a value to be set by a user of the desired amount of liquid to flow through the feed-through is also administered within a period of time desired by the user.

Example 1:

The present invention will be further elucidated with reference to the non-limitative example shown in the following table.

Table 1 gives an overview of weights measured by a weight measuring device of a infusion bag filled with water, from which the water flows. The initial weight was measured at time 0 (the starting time), after which the weight of the infusion bag filled with water was further measured with a frequency of 1 Hz. Of each successive five weight measurements, the median and the largest difference between two of the five weight measurements of these five weight measurements are determined and stored in the memory 20. If this greatest difference exceeds a predetermined value, this group of five weight measurements is not used any further. However, if this largest difference is smaller than the predetermined value, the median is used to determine the flow.

In the example of Table 1, the predetermined allowable difference between two weight measurements of the five detected weight measurements is set to 10 grams.

As a result, the data from group 1 is not used to determine the flow, since the largest weight difference (21.11 grams) is more than the predetermined maximum value (10 grams). The weight data of groups 2 and 3 may be can be used, since the largest weight difference is 5.52 and 2.20 grams respectively. This allows the flow rate to be determined by taking the difference between the median of the second and third groups (999.29 - 997.11 = 2.18 grams) and dividing this value by the elapsed time corresponding to the middle measured value of a group. In the example, this is the third measured value of 12 for each group, between which 5 seconds each time elapses. The flow rate for the example thus amounts to 0.436 grams per second. By dividing this by the

T-J

density (1 g / cm) the flow can easily be determined (0.436 cm per second or 26.16 cc per minute).

5

Time (Seconds) Weight (Gram) Number

Median weight (Gram)

Maximum weight difference (Gram) Ö 1000.27 1 1016.24 1 2 1008.70 1000.27 3 1000.03 21.11 4 995.13 1 995.05 6 997.54 2 7 1000.54 999.29 8 1000.43 5.52 9 999.29 TÖ 997 ^ 9 ΊΙ 996 ^ 4 3 12 997.11 997.11 "9 998.55 2.20 14 998.48

Table 1: Measured weight data of a fluid-filled infusion bag, from which fluid flows.

The present invention will be further elucidated on the basis of the non-limiting claims invention shown in the following figures. In the figures, identical parts are designated with the same reference numerals. Herein: figure 1 shows a perspective schematic view of a first embodiment of the present invention, wherein a holder designed as an infusion bag is coupled to the device; Figure 2: a block diagram in which the various parts of the device of figure 1 are schematically shown; figure 3: a perspective schematic view of a second embodiment of the invention; and figure 4: a perspective view on the rear side of the device from figure 1, wherein the device is coupled to an infusion rod.

Figure 1 shows a device 1 for determining the amount of liquid present in a container for medical use, such as an infusion bag 2, provided with a passage 10 2a for liquid, which can be closed by a tap (not shown). The device 1 comprises a housing 3, to which coupling means in the form of a hook 4 are attached, with the intervention of a weight measuring device, not shown in this drawing, designed for determining the weight of the infusion bag 2. The device furthermore comprises a memory placed in the interior of the 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 located on an outside of the housing 3. The device further comprises fixing means (not shown in this drawing) for coupling the device 1 with an infusion rod (not shown).

20

Figure 2 shows a block diagram showing how the different parts of the device of Figure 1 are connected to each other. The infusion bag 2 is detachably connected to the hook 4. The hook 4 is connected to the weight measuring device 8, which is designed, for example, as a Hall sensor. The weight measuring device 8 is connected to the data processing unit 10. The display 5, the control panel 6, the signal means designed as an LED 7 and the memory 9 are also connected to the data processing unit 10. It is noted here that the signal means may also comprise a beeper or another auditory signal device. The display 5, the control panel 6, the LED 7, the weight measuring device 8, the memory 9 and the data-processing unit 10 are also connected to the battery 12 for obtaining the energy required. This battery is preferably formed by a rechargeable battery, but can also be formed by a non-rechargeable battery. A power supply connection that can be connected to the mains can be used instead of a battery.

14

The device works as follows. After an infims bag 2 is coupled to the hook 4, the weight measuring device 8 measures the weight of the infusion bag 2 and outputs a corresponding signal. This signal representing the measured weight is stored in the memory 9. By means of the control panel 6 the data processing unit 10 can be operated such that the flow rate is determined on the basis of weight data stored in the memory.

In order to determine a flow rate, a user turns the tap at least partially open, through which liquid flows out of the infusion bag 2 through the passage 2a. At a frequency of 1 Hz, the weight measuring device 8 measures the weight of the infusion bag, whereafter the signals representing these values are sent to the data processing unit 10 and stored in the memory 9. The data processing unit 10 calculates on the basis of 15 memory data concerning the specific mass of the liquid introduced into the memory beforehand, the difference of weights of the infusion bag 2 measured at least at two mutually different times and the time difference between these times the flow. This is then shown on the display 5. The user can further open or partially close the tap 20 on the basis of the displayed flow rate if the value of the displayed flow rate is below or above the value desired by the user (target value).

Using the control panel 6, the user can enter the desired amount of liquid to flow out of the infusion bag 2, whereafter the data processing unit 10 flows out of the infusion bag based on the weight of the infusion bag 2, the determined flow rate and the desired amount. liquid determines the remaining time and shows it on the display 5.

Further reference data can be entered into the memory 9 using the control panel 6. Examples of further reference data are: the initial weight of the infusion bag 2, the weight of the infusion bag 2, after a quantity of liquid has flowed through the passage 2a, the quantity of liquid flowing through the passage, the length of time before the desired quantity of liquid 15 has passed through the passage. feed-through 2a has flowed (residual time), a lower limit and upper limit of the flow rate of the liquid, and so on.

If now a value determined by the device 1 deviates from the lower limit or upper limit set by the user 5, the data-processing unit 10 will control the blue LED 7 in such a way that it starts to flash. The device can optionally be arranged such that only then the LED 7 emits a signal if the determined flow rate deviates more than a value preset by a user from the lower or upper limit. This may possibly be accompanied by a sound signal, for which purpose the signal means are provided with a loudspeaker. The device 1 can also be arranged such that it outputs a signal to a central monitoring device (not shown).

Furthermore, the device can be adapted to cause the LED 7 to flash with a frequency that corresponds to the frequency with which drops fall into a dripper belonging to the tap at a desired flow rate. This is based on the fact that the flow rate of the dropper depends only on the frequency of the drops. By setting the frequency and nature of the liquid, the data processing unit 10 calculates the drop frequency and causes the LED 7 to flash at this frequency or to beep at this frequency. The user can then choose the initial setting of the flow rate of the dropper using the frequency. This makes the initial setting of the tap or dripper much more accurate, so that the correct value can be reached faster.

As mentioned above, the device is connected to an infusion rod (not shown) using fixation means (not shown). The infusion bag 2 herein hangs above a surface that is not shown. The liquid flows from the infusion bag 2 under the influence of gravity, which keeps the operation of the device 1 simple.

30

Figure 3 shows an alternative embodiment of the invention. The housing 3 herein comprises a display section 3a and a support section 3b. Between the display section 3a and the support section 3b there is a space 3c, within which the coupling means 4 extend. Wall parts 3d, 3e of the housing 3 form a boundary of the space 16 3 c. If now an infusion bag 2 is coupled to the coupling means 4, the wall parts 3d, 3e at least partially obstruct the freedom of movement of the infusion bag 2, since the infusion bag 2 will then press against at least one of the wall parts 3d, 3e. Any swinging of the infusion bag will therefore not lead to strong deviations from the measurement results.

Figure 4 shows a perspective view of the rear side of the device 1 from figure 1, wherein the device is coupled to an infusion rod 13. To this end, the device 1 is connected to a jib 15 of the infusion rod 13 through fixation means 14. The fixation means comprise a first plate 14a and a second plate 14b. Two threaded cavities are provided in the first plate 14a and the second plate 14b is provided with two continuous cavities which are arranged in accordance with the two threaded cavities. The second plate 14b can be urged in the direction towards the first plate 14a by means of two bolts 14c, the boom 15 being located between the two plates 14a, 14b. In this way the device 1 can be clampingly connected to the infusion rod 13 at the desired position and orientation.

A second coupling means 4a designed as a hook is also connected to the second plate 14b. A second infusion bag can be coupled to this hook 4a, which can be advantageous if it is desired to simultaneously administer different fluids to a person or animal. The coupling means 4,4a designed as hooks are connected to the weight measuring member 8 and the second plate 14b such that if the device 1 is connected to the infusion rod 13, two infusion bags coupled to the hooks 4,4a are situated at approximately the same height. It is also possible that the second plate 14b can be connected separately to the boom 15, so that the second hook 4a can be used without the device 1 having to be coupled to the infusion rod 13.

Positioning means 16 designed as guide rollers are connected to the infusion rod 13. Part of the feed-through 2a is guided through the guide rollers 16.

As a result, during the shocking of the infusion rod 13, the movements of the infusion bag 2 are limited, because a part of the passage 2a is clamped to a greater or lesser extent by the guide rollers 16. The infusion rod 13 is furthermore provided with a lower frame 17 to which wheels 18 are connected.

17

According to a further preferred embodiment, the control circuit can be arranged for outputting a signal which is a measure of the difference between the flow rate determined by the device 1 and a desired (target value) flow rate entered by the user in the memory 9. Such an embodiment requires the presence of a control signal-controllable crane 19, to which the control signal is supplied via a cable 20. The accuracy of the crane 19 is less important here; it is, however, important that the crane reacts unambiguously to the relevant control signal.

In the situation described above, in which a measurement is performed every second, the data processing device will check with each measurement whether the measurement of the flow corresponds to the desired value. When the measured flow rate is less than the target value, the data processing unit will send a signal to the controllable valve which further opens the valve; in the reverse case, a signal that closes the valve 15 further.

The data processing unit 10 will just open or close the valve 19 more to adjust the flow rate of the liquid on the basis of a comparison of the determined flow rate and desired flow rate.

It will be clear that deviations can be made in various ways from the above-described embodiments within the scope of the invention; in particular other types of displays or coupling means can be used.

Claims (24)

  1. Device for determining the amount of liquid present in a holder, which holder is coupled to feed-through means for supplying or discharging the liquid to a human or animal, comprising: coupling means for coupling the holder to the device; a weight measuring device connected to the coupling means for measuring the weight of the holder; a data processing unit coupled to the weight measuring device; 10. a memory connected to the data processing unit for storing the values measured by the weight measuring device; and visual display means for displaying data calculated by the data processing unit; characterized in that the data processing unit is adapted to calculate the flow rate of the liquid flowing through the feed-through means and in that the visual display means are arranged to display the flow rate of the liquid flowing through the feed-through means.
  2. 2. Device as claimed in claim 1, characterized in that the device comprises second coupling means for coupling to the device a second holder, a second weight measuring device connected to the second coupling means and the memory for measuring the weight of the second holder , that the data-processing unit is adapted to calculate the flow rate of the liquid flowing through the feed-through means of the second container and that the visual display means 25 are arranged to display the flow rate of the through-feed means of the second container flowing liquid.
  3. 3. Device as claimed in claim 1 or 2, characterized in that the data-processing unit is adapted to ignore or take into account, depending on the measured values stored in the memory, measured values originating from the weight measuring device.
  4. Device as claimed in any of the foregoing claims, characterized in that the data-processing unit is adapted to ignore measurement values situated outside predetermined limits for further calculation.
  5. Device as claimed in any of the foregoing claims, characterized in that the data-processing unit is adapted to select a representative measurement value, such as an average or a median of the group of measurement values, from a group of successive measurement values originating from the group of weight measuring members for further calculation. 10
  6. Device as claimed in any of the foregoing claims, characterized in that the memory is provided with reference data and that the data-processing unit and the visual display means are adapted to display at least one of the quantities selected from the group consisting of: initial weight of the liquid-filled container; the weight of the liquid container after an amount of liquid has flowed into or out of the container; the amount of liquid flowing in or out of the container; the flow rate of the liquid flowing in or out of the container; 20. a value set by a user of the desired amount of liquid to flow through the feed-through; and the period of time before the liquid still present in the holder has flowed out of the holder or the holder has been filled with liquid flowing in the holder and that the device is provided with operable selection means for choosing the quantity to be displayed.
  7. 7. Device as claimed in any of the foregoing claims, characterized in that the device is adapted to output an auditory signal in dependence on the result of a comparison of weight data from the holder with reference data.
  8. Device as claimed in any of the foregoing claims, characterized in that the device is adapted to deliver a signal to a central monitoring device.
  9. Device as claimed in any of the foregoing claims, characterized in that the device comprises a housing and that the coupling means are adapted to position the holder in a position in which it is at least partially enclosed by wall parts of the housing. 5
  10. Device as claimed in any of the foregoing claims, characterized in that the device comprises positioning means for holding at least a part of the bushing at a substantially fixed position relative to the device.
  11. 11. Device as claimed in any of the foregoing claims, characterized in that the device comprises fixing means for fixing the device to a frame and that the fixing means are adapted to adjust the angular position of the device relative to the frame.
  12. 12. Device as claimed in any of the foregoing claims, characterized in that the weight measuring member comprises a weight sensor, which weight sensor comprises a component selected from the group consisting of: a Hall sensor, a spring unit with an electronic positioning device, a strain gauge, a piezoelectric sensor, a piezo-resistive sensor and a thin film transmitter.
  13. Device as claimed in any of the foregoing claims, characterized in that the device is adapted to deliver a repeated signal perceptible to human senses with an adjustable time interval.
  14. Device as claimed in claim 13, characterized in that the signal is an audio signal.
  15. 15. Device as claimed in claim 13 or 14, characterized in that the device comprises selection means for selecting liquid data stored in the memory and containing at least one liquid data and that the data processing unit is adapted to at least be based on the selected flow rate data and a desired flow rate entered by a user calculating the desired time interval.
  16. Device as claimed in claim 15, characterized in that the device comprises selection means for selecting the name of a liquid and that the data-processing device is arranged for calculating the desired liquid from data stored in the memory and the desired flow rate. desired time interval.
  17. Device as claimed in claim 15 or 16, characterized in that the calculated time interval substantially corresponds to the time interval between two drops of liquid moving during operation in the transit means. 10
  18. Device as claimed in any of the foregoing claims, characterized in that the device is provided with a control circuit for supplying a control signal which is dependent on the result of the comparison of a desired flow rate and the determined flow rate. 15
  19. A metering device, comprising a device according to claim 18 and a flow determining device placed in the feed-through, which is coupled to the control circuit for outputting the control signal to the flow determining device.
  20. A method for determining the amount of liquid in a container that is coupled to a human or animal through a passage for the liquid, comprising the steps of: measuring the weight of the container at a first time; flowing a liquid through the passage; 25. measuring the weight of the holder at at least one second time known with respect to the first point in time; and storing the measurement values thus obtained in a memory; characterized in that the flow rate of the liquid flowing through the feed-through is determined from the measured values thus obtained and the time between the times at which they were obtained.
  21. Method according to claim 20, characterized in that, depending on measured values stored in the memory, measured values originating from the weight measuring device are ignored or taken into account.
  22. Method according to claim 20 or 21, characterized in that measured values outside predetermined limits are ignored.
  23. A method according to any one of claims 20 - 22, characterized in that a representative measurement value, such as an average or a median of the set of measurement values, is used for calculation from a group of successive measured values originating from the weight measuring device.
  24. A method according to any one of claims 20-23, characterized by the step of storing quantities in a memory selected from the group consisting of: a desired amount of liquid to flow through the passage; a lower limit of the weight of the container with liquid; 15. an upper limit of the weight of the liquid container; a desired flow rate of the liquid; and a lower limit and upper limit of the desired flow rate of the liquid, and that the method also comprises the step of displaying a quantity selected from this group.
NL2002338A 2008-12-18 2008-12-18 Device and method for determining the quantity in a holder having a holder, which holder is coupled with feed-out lines for feeding and disposing the liquid and a dosing device. NL2002338C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL2002338 2008-12-18
NL2002338A NL2002338C2 (en) 2008-12-18 2008-12-18 Device and method for determining the quantity in a holder having a holder, which holder is coupled with feed-out lines for feeding and disposing the liquid and a dosing device.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2002338A NL2002338C2 (en) 2008-12-18 2008-12-18 Device and method for determining the quantity in a holder having a holder, which holder is coupled with feed-out lines for feeding and disposing the liquid and a dosing device.

Publications (1)

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NL2002338C2 true NL2002338C2 (en) 2010-06-21

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640277A (en) * 1968-12-09 1972-02-08 Marvin Adelberg Medical liquid administration device
CA1201999A (en) * 1982-08-03 1986-03-18 Peter G. Wheeldon Fluid flow control process and apparatus
EP0477973A1 (en) * 1990-09-28 1992-04-01 Pall Corporation Flow meter
WO2002036044A2 (en) * 2000-10-31 2002-05-10 B. Braun Medical, Inc. Patient medication iv delivery pump with wireless communication to a hospital information management system
US20050267413A1 (en) * 2004-05-26 2005-12-01 Wang Jong H Flow monitoring devices and methods of use
US20060064053A1 (en) * 2004-09-17 2006-03-23 Bollish Stephen J Multichannel coordinated infusion system
US20060270971A1 (en) * 2004-09-09 2006-11-30 Mark Gelfand Patient hydration system with a redundant monitoring of hydration fluid infusion
US20070255199A1 (en) * 2006-05-01 2007-11-01 Cardinal Health 303, Inc. System and method for controlling administration of medical fluid

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640277A (en) * 1968-12-09 1972-02-08 Marvin Adelberg Medical liquid administration device
CA1201999A (en) * 1982-08-03 1986-03-18 Peter G. Wheeldon Fluid flow control process and apparatus
EP0477973A1 (en) * 1990-09-28 1992-04-01 Pall Corporation Flow meter
WO2002036044A2 (en) * 2000-10-31 2002-05-10 B. Braun Medical, Inc. Patient medication iv delivery pump with wireless communication to a hospital information management system
US20050267413A1 (en) * 2004-05-26 2005-12-01 Wang Jong H Flow monitoring devices and methods of use
US20060270971A1 (en) * 2004-09-09 2006-11-30 Mark Gelfand Patient hydration system with a redundant monitoring of hydration fluid infusion
US20060064053A1 (en) * 2004-09-17 2006-03-23 Bollish Stephen J Multichannel coordinated infusion system
US20070255199A1 (en) * 2006-05-01 2007-11-01 Cardinal Health 303, Inc. System and method for controlling administration of medical fluid

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