CN110787340A - Method and device for detecting dropping speed of infusion - Google Patents
Method and device for detecting dropping speed of infusion Download PDFInfo
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- CN110787340A CN110787340A CN201911085292.2A CN201911085292A CN110787340A CN 110787340 A CN110787340 A CN 110787340A CN 201911085292 A CN201911085292 A CN 201911085292A CN 110787340 A CN110787340 A CN 110787340A
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- 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
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- 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
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
- A61M5/1684—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
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- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
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- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Veterinary Medicine (AREA)
- Heart & Thoracic Surgery (AREA)
- Public Health (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention relates to a method and a device for detecting the dropping speed of infusion, belonging to the technical field of medical treatment, in particular to the technical field of medical venous infusion; the liquid level sensor comprises ten capacitance sensing pole pieces arranged on a capacitance sensing piece from bottom to top, wherein each capacitance sensing pole piece can independently sense capacitance change so as to sense the liquid level; the acquired data is subjected to drying processing by using an amplitude limiting filtering method, so that the accuracy of the drop velocity calculation is improved, and the interference of small-amplitude self-oscillation after the drops fall on the drop velocity calculation is eliminated. The device has the advantages that only one capacitive sensing pole piece is required to be close to the Murphy's dropper, three sides can be exposed, the minimum shielding surface is provided, and the visual field can be observed to the maximum extent. The device can work well under strong light and in an infrared interference environment. When the infusion is stable, the infusion drop speed can be well detected.
Description
Technical Field
The invention relates to a method and a device for detecting the dropping speed of infusion, belonging to the technical field of medical treatment, in particular to the technical field of medical intravenous infusion.
Background
At present, intravenous infusion is the most common and important auxiliary treatment means in clinical medical work. In the medical monitoring field, the intravenous infusion emerges as a plurality of infusion monitoring devices and instruments, and the functions of the devices are similar, so that the device is used for monitoring the dropping speed of the intravenous infusion and other functions. In the existing devices and instruments for monitoring infusion, an infrared pair tube scheme is basically adopted for detecting the infusion drop speed, i.e. infrared light is transmitted by an infrared light emitting diode on one surface and infrared rays are received by an infrared photodiode on the other surface of the opposite surfaces of a Murphy's tube to detect the dropping of the drops, so that the infusion drop speed is calculated. The method for detecting the liquid drops by infrared rays needs to have two parts of infrared emission and infrared receiving, and in use, the method needs to be arranged on two opposite surfaces of a dropping funnel of an infusion tube. When a patient or a nurse needs to directly observe the liquid drops of the infusion dropping funnel, the detection method can block more observation visual fields. The shielding transfusion for the large area of the dropping funnel influences the function that the dropping funnel of the transfusion tube can comprehensively observe the transfusion, causes uneasiness for patients and is not beneficial to the safe transfusion of the patients. In addition, the liquid drop is detected in an infrared mode, so that the liquid drop is easily interfered by strong light and infrared light, and the phenomena of undetected detection and inaccurate detection are caused in the environment of the strong light and the infrared light.
Disclosure of Invention
The invention aims to reduce the shielding of a Murphy's dropper as much as possible, detect infusion liquid drops and avoid the interference of strong light and infrared light, thereby disclosing a method and a device for detecting the infusion drop speed based on capacitance induction.
The invention is realized by the following technical scheme that the liquid level sensor comprises ten capacitance sensing pole pieces arranged on a capacitance sensing piece from bottom to top, and each capacitance sensing pole piece can independently sense capacitance change so as to sense the liquid level; the acquired data is subjected to drying processing by using an amplitude limiting filtering method, so that the accuracy of the drop velocity calculation is improved, and the interference of small-amplitude self-oscillation after the drops fall on the drop velocity calculation is eliminated.
The amplitude limiting filtering method is characterized in that the maximum deviation value allowed by two times of sampling is set, when the deviation between the value of the current sampling and the value of the last sampling is larger than the set maximum deviation value, the sampling value is taken, and otherwise, the sampling value is discarded as invalid interference data. In practical tests, the influence of small amplitude oscillation after liquid drops fall is different under different infusion heights, and the higher the height is, the larger the oscillation period and the oscillation amplitude after the liquid drops fall are, so that the maximum deviation value of amplitude limiting filtering is set according to the heights of a plurality of liquid levels in the sampling process. In addition, in the initial stage of dripping, the dripping speed changes greatly, in the sampling process, the sampling time is dynamically adjusted according to the speed change, the currently acquired speed value is compared with the last speed value, if the difference value changes greatly, the sampling time is shortened, and if the difference value changes slightly, the sampling time is amplified.
The algorithm mainly comprises the following steps:
step 2, detecting the low liquid level steady state time timing after the first drop fallsAnd after the second drop falls, detecting the high liquid level transient time
，
As a sampling time interval for the second droplet;
step 3, collecting droplet speed data according to the high liquid level transient time interval of every two droplets, calculating the difference value between the speed collected this time and the speed collected last time, setting a sampling time interval,
step 4, repeating the step 3, and collecting a plurality of groups of data; typically five sets of data;
step 5, performing limited-pair filtering processing on the data one by one, wherein the amplitude value changes according to the previous sampling value, and then calculating the arithmetic mean value to obtain the dropping speed of the current dropping liquid;
and 6, repeating the steps 4 and 5 when the next droplet speed is calculated.
The invention is also used for detecting the over-high or over-low liquid level in the dropping funnel: when the capacitance sensing pole piece at the highest position senses the liquid level, the liquid level in the dropping funnel is indicated to be too high;
when the lower capacitance induction pole piece can not induce the liquid level, the liquid level in the dropping funnel is over low.
The invention comprises a capacitance induction sheet attached to the wall of a dropping funnel, an MCU processing and operating unit and ten capacitance induction pole pieces arranged on the capacitance induction sheet from bottom to top; and the processing and operation unit of the MCU detects and processes based on the DA14580 Bluetooth control chip.
Connecting ten capacitance sensing pole pieces on the capacitance sensing piece into ten IO pins of an MCU processing operation unit; and the MCU processing arithmetic unit calculates charging and discharging time for each IO pin and independently detects the ordered change of the capacitance of each IO pin caused by the falling of liquid drops.
The invention has the advantages and beneficial effects that a novel liquid drop detection method and a novel liquid drop detection device are provided, the size is small, the Murphy dropper is shielded to the minimum extent, and the normal observation function of the Murphy dropper is not influenced. The liquid drop can be effectively detected, and therefore the dropping speed of the liquid drop can be detected. The problem of traditional infusion detector exist surround the shading to the large tracts of land of Murphy's burette for a long time, solved the sensitive problem of traditional infrared infusion detector existence to highlight and infrared interference, improved the flexibility and the reliability that the infusion detector was controlled, the nurse patient can the direct observation drip chamber infusion, also can read the speed of dripping and the liquid level on the infusion detector, does not influence the original function of infusing of transfer line, has promoted work efficiency, has improved the speed of dripping calculation precision.
Drawings
FIG. 1 is a schematic diagram of an MCU and a capacitive sensing chip.
FIG. 2 is a schematic view of a capacitive sensing piece.
FIG. 3 is a schematic view of a low level steady state.
Fig. 4 is a schematic diagram of a high level transient after a drop has fallen.
Detailed Description
The preferred embodiment of the present invention is further described with reference to fig. 1 to 4, wherein the present invention includes ten capacitance sensing pole pieces, which are arranged on the capacitance sensing piece 1 from bottom to top, and are marked as 11 to 110 from bottom to top, each capacitance sensing pole piece can independently sense capacitance change, so as to sense liquid level; the acquired data is subjected to drying processing by using an amplitude limiting filtering method, so that the accuracy of the drop velocity calculation is improved, and the interference of small-amplitude self-oscillation after the drops fall on the drop velocity calculation is eliminated.
The amplitude limiting filtering method is characterized in that the maximum deviation value allowed by two times of sampling is set, when the deviation between the value of the current sampling and the value of the last sampling is larger than the set maximum deviation value, the sampling value is taken, and otherwise, the sampling value is discarded as invalid interference data. In practical tests, the influence of small amplitude oscillation after liquid drops fall is different under different infusion heights, and the higher the height is, the larger the oscillation period and the oscillation amplitude after the liquid drops fall are, so that the maximum deviation value of amplitude limiting filtering is set according to the heights of a plurality of liquid levels in the sampling process. In addition, in the initial stage of dripping, the dripping speed changes greatly, in the sampling process, the sampling time is dynamically adjusted according to the speed change, the currently acquired speed value is compared with the last speed value, if the difference value changes greatly, the sampling time is shortened, and if the difference value changes slightly, the sampling time is amplified.
The main steps of the algorithm are as shown in fig. 3 and 4, and include:
step 2, the first dropWhen the liquid 41 drops, the steady-state time of the liquid level 51 is detected
Detection of a high level 52 transient time following the drop of the second drop 42，As a sampling time interval for the second droplet;
step 3, collecting droplet velocity data according to the transient time interval of the high liquid level 52 of every two droplets, solving the difference value between the velocity collected this time and the velocity collected last time, setting the sampling time interval,
step 4, repeating the step 3, and collecting a plurality of groups of data; typically five sets of data;
step 5, performing limited-pair filtering processing on the data one by one, wherein the amplitude value changes according to the previous sampling value, and then calculating the arithmetic mean value to obtain the dropping speed of the current dropping liquid;
and 6, repeating the steps 4 and 5 when the next droplet speed is calculated.
The invention is also used for detecting over-high or over-low liquid level in the dropping funnel 3: when the capacitance sensing pole piece at the highest position, namely the capacitance sensing pole piece at the label 110 senses the liquid level, the liquid level in the dropping funnel 3 is over high;
when the lower capacitance induction pole piece, namely the capacitance induction pole piece with the label 11 cannot induce the liquid level and cannot induce the liquid level, the liquid level in the dropping funnel is over low. After the infusion is started, when the liquid drop can not be detected for a long time and the liquid level is sensed to be gradually reduced until the liquid level can not be sensed by the capacitance sensing pole piece with the reference number 11, the completion of the infusion is indicated. The device and the method can be used for prompting patients and nurses to finish infusion or change medicines in time, and assisting the nurses to work more efficiently.
The invention comprises a capacitance induction sheet 1 attached to the outer wall of a dropping funnel 3, ten capacitance induction pole pieces arranged on the capacitance induction sheet from bottom to top, and an MCU processing and operating unit 2, wherein the capacitance induction pole pieces are marked as 11-110 from bottom to top; the MCU processing arithmetic unit 2 controls the chip detection processing based on the DA14580 Bluetooth.
Ten capacitance induction pole pieces on the capacitance induction piece 1 are connected into ten IO pins of the MCU processing arithmetic unit 2; the MCU processing arithmetic unit 2 calculates charging and discharging time for each IO pin, and detects ordered changes of capacitance of each IO pin caused by liquid drop falling independently.
During the use, put dropping funnel 3 outer wall with electric capacity response piece 1 subsides, as shown in fig. 2, each dropping liquid drippage before and after dropping can lead to the change of dropping funnel wall liquid level in dropping funnel 3, lead to electric capacity response piece 1 to sense different liquid levels before and after the dropping. After stable infusion, the fluctuation of the liquid level caused by each drop of liquid is basically consistent, before the first drop of liquid 41 falls, as shown in fig. 3, the steady state induction is the relative low liquid level 51, the induction of the capacitance induction pole piece at the label 13 and the label 14 and the capacitance induction pole piece below the capacitance induction pole piece is in a liquid state, and the induction of the capacitance induction pole piece at the label 15 and the capacitance induction pole piece above the capacitance induction pole piece is in a liquid-free state; fig. 4 shows a high liquid level 52 at the moment when the first dropping liquid 41 falls, and accordingly the capacitive sensing plate 1 senses a high liquid level 52, the capacitive sensing plate 16 senses a liquid state and the capacitive sensing plate below the capacitive sensing plate, and the capacitive sensing plate 17 senses a liquid-free state and the capacitive sensing plate above the capacitive sensing plate. The principle is that each time the liquid level in the dropping funnel 3 is changed greatly, the capacitance sensing pole piece of the capacitance sensing piece 1 corresponding to the liquid level can be caused to output a large change value, so that the generation of a drop of liquid can be detected. The Murphy's dropper is shielded to the minimum extent, and the normal observation function of the Murphy's dropper is not influenced. The liquid drop can be effectively detected, and therefore the dropping speed of the liquid drop can be detected. The problem of traditional infusion detector exist surround the shading to the large tracts of land of Murphy's burette for a long time, solved the sensitive problem of traditional infrared infusion detector existence to highlight and infrared interference, improved the flexibility and the reliability that the infusion detector was controlled, the nurse patient can the direct observation drip chamber infusion, also can read the speed of dripping and the liquid level on the infusion detector, does not influence the original function of infusing of transfer line, has promoted work efficiency, has improved the speed of dripping calculation precision.
Claims (5)
1. A method for detecting the dropping speed of infusion is characterized in that: ten capacitance induction pole pieces are arranged on the capacitance induction piece from bottom to top, and each capacitance induction pole piece can independently induce capacitance change so as to induce liquid level; the acquired data is subjected to drying processing by using an amplitude limiting filtering method, so that the accuracy of the drop velocity calculation is improved, and the interference of small-amplitude self-oscillation after the drops fall on the drop velocity calculation is eliminated.
2. The method for detecting the dropping speed of an infusion solution according to claim 1,
the amplitude limiting filtering method is characterized in that the maximum deviation value allowed by two times of sampling is set, when the deviation between the value of the current sampling and the value of the last sampling is larger than the set maximum deviation value, the sampling value is taken, and otherwise, the sampling value is discarded as invalid interference data.
3. The method for detecting the dropping speed of the infusion solution according to claim 1 or 2, wherein the algorithm mainly comprises the following steps:
step 1, firstly, recording the steady state time of the low liquid level
Recording high level transient time after drop
，
As the landing time of the first drop, the speed of the first drop is calculated;
step 2, detecting the low liquid level steady state time timing after the first drop fallsAnd after the second drop falls, detecting the high liquid level transient time
，
As a sampling time interval for the second droplet;
step 3, collecting droplet speed data according to the high liquid level transient time interval of every two droplets, calculating the difference value between the speed collected this time and the speed collected last time, setting a sampling time interval,
step 4, repeating the step 3, and collecting a plurality of groups of data; typically five sets of data;
step 5, performing limited-pair filtering processing on the data one by one, wherein the amplitude value changes according to the previous sampling value, and then calculating the arithmetic mean value to obtain the dropping speed of the current dropping liquid;
and 6, repeating the steps 4 and 5 when the next droplet speed is calculated.
4. The method for detecting the dropping speed of the infusion solution as claimed in claim 1, which is further used for detecting whether the liquid level in the dropping funnel is too high or too low: when the capacitance sensing pole piece at the highest position senses the liquid level, the liquid level in the dropping funnel is indicated to be too high;
when the lower capacitance induction pole piece can not induce the liquid level, the liquid level in the dropping funnel is over low.
5. The utility model provides a detection device of infusion speed, its characterized in that: the device comprises a capacitance induction sheet attached to the wall of the dropping funnel, ten capacitance induction pole pieces arranged on the capacitance induction sheet from bottom to top, and an MCU processing and operating unit;
connecting ten capacitance sensing pole pieces on the capacitance sensing piece into ten IO pins of an MCU processing operation unit; and the MCU processing arithmetic unit calculates charging and discharging time for each IO pin and independently detects the ordered change of the capacitance of each IO pin caused by the falling of liquid drops.
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| CN201911085292.2A CN110787340A (en) | 2019-11-08 | 2019-11-08 | Method and device for detecting dropping speed of infusion |
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| CN201911085292.2A CN110787340A (en) | 2019-11-08 | 2019-11-08 | Method and device for detecting dropping speed of infusion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114103A (en) * | 2021-11-10 | 2022-03-01 | 国家石油天然气管网集团有限公司 | Material force magnetic characteristic parameter determination method for strong and weak magnetic detection |
| CN115356381A (en) * | 2022-08-15 | 2022-11-18 | 四川省慈予医疗科技有限责任公司 | Double-capacitor acquisition method for infusion tube based on variable electric field effect |
-
2019
- 2019-11-08 CN CN201911085292.2A patent/CN110787340A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114103A (en) * | 2021-11-10 | 2022-03-01 | 国家石油天然气管网集团有限公司 | Material force magnetic characteristic parameter determination method for strong and weak magnetic detection |
| CN115356381A (en) * | 2022-08-15 | 2022-11-18 | 四川省慈予医疗科技有限责任公司 | Double-capacitor acquisition method for infusion tube based on variable electric field effect |
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