CN219743548U - Novel infusion drip speed measuring and alarming device - Google Patents
Novel infusion drip speed measuring and alarming device Download PDFInfo
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- CN219743548U CN219743548U CN202222542243.0U CN202222542243U CN219743548U CN 219743548 U CN219743548 U CN 219743548U CN 202222542243 U CN202222542243 U CN 202222542243U CN 219743548 U CN219743548 U CN 219743548U
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- 238000001802 infusion Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000003814 drug Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 102100026278 Cysteine sulfinic acid decarboxylase Human genes 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 108010064775 protein C activator peptide Proteins 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of medical appliances, and particularly relates to a novel infusion drip speed measuring and alarming device. The method adopts the measurement of the capacitance changes at two sides of the infusion tube to realize the measurement of the drop, and the drop speed can be obtained by measuring and calculating the time interval between two pulse values by the pulse generated by the capacitance change caused in the drop dropping process. Comprises a capacitance sensor arranged on an inclined dropping funnel; and the capacitance sensor is used for detecting the liquid drop dropped by the dropping funnel.
Description
Technical Field
The utility model belongs to the technical field of medical appliances, and particularly relates to a novel infusion drip speed measuring and alarming device.
Background
Infusion is an important treatment. When a patient is in a hospital for infusion, care is often required by a nurse or family member. Nurses need to pay attention to the transfusion condition of patients at any time, so that the patients are prevented from being excessively fast. Meanwhile, nurses or accompanying staff need to find out the condition of the infusion completion in time and pull out the infusion tube in time. This is a tedious task for caregivers and nurses.
Currently, commercial products of the same type generally employ the photoelectric principle to detect droplet dynamics and generate an electrical signal when no liquid is present. Such products generally only achieve the end of drip alarm function. Meanwhile, for some medicaments requiring light shielding, the detection is that the used light source can have adverse effects on the medicaments. The other products adopt a weighing mode, the dropping speed is determined by detecting the weight change of the infusion bottle (bag), and meanwhile, the alarm of ending the infusion is realized. This approach only allows for detection of the average drop velocity over a relatively long period of time, since it is not possible to detect weight changes caused by a single drop. On the other hand, the change in the weight value due to the movement of the patient affects the reliability of the weighing result.
Still another solution is to measure the drop velocity by means of an image. The principle is that the moment that liquid drops drop in a dropping funnel is captured by a camera, and the dropping speed of the liquid drops is obtained by judging the dropping speed of the liquid drops through pattern recognition. However, this method requires a light source and eliminates the effect of background light, such as in particular bright, shielding portions of the ambient light; and light supplement is needed in the place of insufficient light, which is unsuitable for medicines needing light shielding.
Disclosure of Invention
The utility model provides a novel transfusion dripping speed measuring and alarming device aiming at the defects existing in the prior art. The method adopts the measurement of the capacitance changes at two sides of the infusion tube to realize the measurement of the drop, and the drop speed can be obtained by measuring and calculating the time interval between two pulse values by the pulse generated by the capacitance change caused in the drop dropping process.
In order to achieve the purpose, the utility model adopts the following technical scheme that the utility model comprises a capacitance sensor arranged on an inclined dropping funnel; and the capacitance sensor is used for detecting the liquid drop dropped by the dropping funnel.
Further, the two electrodes of the capacitance sensor are composed of two parallel metal strips, and the metal strips are fixed on the outer wall of the dropping funnel through conductive adhesive.
Furthermore, the positive electrode and the negative electrode of the capacitance sensor are fixed on the outer wall below the inclined dropping funnel.
Further, the capacitive sensor employs a capacitive-to-digital converter CDC.
Further, two electrodes of the capacitive sensor are respectively connected with the measuring module; the measuring module comprises a PCAP02AE chip, the PCAP02AE chip is respectively connected with the capacitance sensor and the singlechip, and the singlechip is connected with the PC through the communication module.
Compared with the prior art, the utility model has the beneficial effects.
The utility model can realize non-contact measurement of infusion drip speed, and transmits related information to a hospital nurse station through a wireless communication mode to be used as an alarm, and simultaneously, a nurse can conveniently grasp the infusion process, so that the nursing workload is effectively reduced while the medical experience of patients is improved.
Drawings
The utility model is further described below with reference to the drawings and the detailed description. The scope of the present utility model is not limited to the following description.
FIG. 1 is a schematic view of the installation of a tilting bucket and a capacitive sensor.
Fig. 2 is a schematic diagram of the change in capacitance between the positive and negative electrodes.
Fig. 3 is a schematic view of a vertically arranged drip chamber.
Fig. 4 is a table of several drop detection comparison results.
Fig. 5 is a schematic diagram of the capacitive sensor and measurement module connection.
Fig. 6 is a schematic diagram of the positions of the droplets and the electrode plate in the second embodiment.
Fig. 7 is a diagram showing an example of measurement results.
Fig. 8 is an example of the results of the higher drop rate measurement.
Fig. 9 is a circuit diagram of a measurement module connected to a capacitive sensor.
In the figure, 1 is a dropping funnel, 2 is a capacitance sensor, 3 is a liquid drop, 4 is an electrode plate+, and 5 is an electrode plate-.
Detailed Description
Specific examples: comprises a capacitance sensor 2 arranged on an inclined dropping funnel 1; and the capacitive sensor 2 is used for detecting the liquid drops 3 falling from the dropping funnel 1.
Preferably, the two electrodes of the capacitive sensor 2 are composed of two parallel metal strips, and the metal strips are fixed on the outer wall of the dropping funnel 1 through conductive adhesive. The positive and negative electrode plates of the capacitance sensor 2 are fixed on the outer wall below the inclined dropping funnel 1.
Preferably, the capacitive sensor 2 employs a capacitive-to-digital converter CDC.
Preferably, the two polar plates of the capacitive sensor 2 are respectively connected with a measuring module; the measuring module comprises a PCAP02AE chip, the PCAP02AE chip is respectively connected with the capacitance sensor 2 and the singlechip, and the singlechip is connected with the PC through the communication module.
Scheme comparison:
the test results of the following two different capacitive arrangements are compared.
Scheme one, as shown in figure 3, adopts a vertically arranged dropping funnel 1 to measure the capacitance change between the walls of the dropping funnel 1 at two sides caused in the dropping process of the dropping liquid.
The test results show that the drop funnel 1 is not easily detected because the diameter of the drop funnel is large in scale relative to the diameter of the drop, that is, because the distance between the two polar plates of the capacitor is large, and the capacitance change caused by the drop in the dropping process is small. Therefore, the process does not have commercially acceptable operating conditions for the present day.
In the second scheme, as shown in fig. 1, the capacitance change between two polar plates on the wall of the dropping funnel 1 caused by the dropping of the dropping liquid onto the inner wall of the dropping funnel 1 is measured by obliquely placing the dropping funnel 1. The polar plate is composed of two parallel metal strips and is fixed on the outer wall of the dropping funnel 1 through conductive adhesive.
As shown in fig. 6, when the liquid droplet 3 falls down to the bottom of the dropping funnel 1, the capacitance between the electrode plates will decrease. This process results in the generation of a peak capacitance pulse, the drop velocity value being deduced by measuring the time interval between the two pulses. The results of the experimental tests show that:
(1) The capacitance change caused by the droplet 3 is quite large, and has a significant magnitude order difference from the environmental background value, which indicates that the scheme can have strong applicability in practical application;
(2) The dripping speed measured by the comparison equipment is very consistent with the result tested by the stopwatch, so that the accuracy of the dripping speed is fully verified;
(3) Tests on infusion tubes of different colors show that the infusion tube is applicable to commonly used infusion tubes.
Fig. 4 compares several drop 3 detections, from which it can be seen: the utility model avoids the influence of the light source used in photoelectric measurement on the liquid medicine, and can realize the detection of the liquid drops 3 in a weighing mode, but effectively avoids the problem of inaccurate measurement caused by shaking of the infusion device. In addition, the utility model can be suitable for different infusion tube types (colors and materials).
Specifically, the principle of one-drop number measurement is explained.
As shown in fig. 1: the dropping funnel 1 is arranged obliquely, and two electrodes (+, -) are arranged on the outer wall below the dropping funnel 1. The liquid drop 3 drops onto the inner wall of the dropping funnel 1 under the action of gravity, so that the capacitance value between the two electrodes is increased due to the influence of the liquid drop 3, and the capacitance between the two electrodes is reduced along with the sliding of the liquid drop 3 from the inner wall of the dropping funnel 1. This causes a pulse in the capacitance between the electrodes, as shown in fig. 2. By measuring the time between the two pulses, the drop velocity of the drop 3 can be accurately deduced. Meanwhile, the specific value of the capacitor is not needed to be considered in measuring the dripping speed, only the pulse signal with the changed capacitance value is needed to be detected, the measuring difficulty is greatly simplified, and the measuring accuracy, reliability and anti-interference performance are improved.
2. And a measurement module.
As shown in fig. 5, a measurement module using PCAP02 as a capacitance measurement core device is constructed to realize capacitance measurement between two electrodes, and the result is transferred to a PC end through a TTL-to-USB communication module. The software of the PC side realizes the tasks of setting, controlling and displaying, recording the acquired capacitance value and the like of the PCAP 02. The circuit diagram is shown in fig. 9.
Analysis and comparison of measurement results:
according to the system constructed as described above, measurement of the correlation of capacitance values between the two electrodes was performed by software reading. In fig. 7, the abscissa indicates the number of samples, and the ordinate indicates the capacitance value. The capacitance pulse value in the figure is caused by the instantaneous increase of the capacitance between the two electrodes due to the drop 3 falling onto the inner wall of the dropping funnel 1. As already mentioned, measuring the time interval between two successive pulses can correctly obtain the drop velocity of the drop 3. After measuring the intervals of the pulses in the graph and taking the average, the drop velocity obtained was 0.85 seconds/drop, which is very close to the measured value (time required for measuring 20 drops and then calculating the drop velocity) of 0.866 seconds/drop using a stopwatch.
Further, the other drop numbers were compared, and fig. 8 shows that the drop speed was 0.4 seconds/drop, and the stopwatch measurement was 0.42 seconds/drop. This error is acceptable given that at higher drop speeds, the stopwatch measurement is affected by the human reaction time (measurement time is too short). Lengthening the measurement time can effectively eliminate human measurement errors, and the measured results of the two are believed to be consistent.
It can be seen that the infusion drop speed can be effectively fixed by utilizing the capacitance change caused by the falling of the detection drop 3 onto the inner wall of the dropping funnel 1.
It should be understood that the foregoing detailed description of the present utility model is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present utility model, and those skilled in the art should understand that the present utility model may be modified or substituted for the same technical effects; as long as the use requirement is met, the utility model is within the protection scope of the utility model.
Claims (3)
1. The utility model provides a novel infusion drip rate survey and alarm device which characterized in that: comprises a capacitance sensor arranged on an inclined dropping funnel; the capacitive sensor is used for detecting liquid drops falling from the dropping funnel;
the two electrodes of the capacitance sensor consist of two parallel metal strips, and the metal strips are fixed on the outer wall of the dropping funnel through conductive adhesive;
the positive electrode and the negative electrode of the capacitance sensor are fixed on the outer wall below the inclined dropping funnel;
the liquid drops drop onto the inner wall of the dropping funnel under the action of gravity, so that the capacitance value between the two electrodes is increased due to the influence of the liquid drops, and the capacitance between the two electrodes is reduced along with the sliding of the liquid drops from the inner wall of the dropping funnel.
2. The novel infusion drip rate measurement and alarm device according to claim 1, wherein: the capacitive sensor employs a capacitive-to-digital converter CDC.
3. The novel infusion drip rate measurement and alarm device according to claim 1, wherein: the two electrodes of the capacitive sensor are respectively connected with the measuring module; the measuring module comprises a PCAP02AE chip, the PCAP02AE chip is respectively connected with the capacitance sensor and the singlechip, and the singlechip is connected with the PC through the communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222542243.0U CN219743548U (en) | 2022-09-26 | 2022-09-26 | Novel infusion drip speed measuring and alarming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222542243.0U CN219743548U (en) | 2022-09-26 | 2022-09-26 | Novel infusion drip speed measuring and alarming device |
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| Publication Number | Publication Date |
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| CN219743548U true CN219743548U (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222542243.0U Active CN219743548U (en) | 2022-09-26 | 2022-09-26 | Novel infusion drip speed measuring and alarming device |
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| CN (1) | CN219743548U (en) |
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2022
- 2022-09-26 CN CN202222542243.0U patent/CN219743548U/en active Active
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