CN113855915B - Intelligent transfusion monitor control method based on stepping motor accurate control of dropping speed - Google Patents
Intelligent transfusion monitor control method based on stepping motor accurate control of dropping speed Download PDFInfo
- Publication number
- CN113855915B CN113855915B CN202111128066.5A CN202111128066A CN113855915B CN 113855915 B CN113855915 B CN 113855915B CN 202111128066 A CN202111128066 A CN 202111128066A CN 113855915 B CN113855915 B CN 113855915B
- Authority
- CN
- China
- Prior art keywords
- stepping motor
- dropping speed
- speed
- value
- intelligent transfusion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims description 33
- 238000001802 infusion Methods 0.000 claims description 28
- 239000011888 foil Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 description 5
- 230000000474 nursing effect Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000001990 intravenous administration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
-
- 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
- A61M5/16877—Adjusting flow; Devices for setting a flow rate
-
- 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
Abstract
The application provides a control method of an intelligent transfusion monitor based on accurate control of a stepping motor, which comprises the following steps: step 1: setting a target dropping speed of an intelligent transfusion monitor; step 2: acquiring the current dropping speed of the intelligent transfusion monitor, and calculating a basic value of the regulation proportion; step 3: adjusting the basic value of the adjusting proportion to form a corrected adjusting proportion; step 4: setting an adjusting step number basic value of a stepping motor; step 5: step number adjustment of the stepping motor is carried out, so that the clamping state of the intelligent transfusion monitor is adjusted; step 6: and judging whether the difference between the current drop velocity and the target drop velocity is within an allowable error range, if so, stopping adjusting, otherwise, performing fine adjustment until the difference is controlled within the allowable range. The application controls the advance and the retreat of the sliding block by the stepping motor and matching with the corresponding algorithm, and has high precision, flexibility and convenience.
Description
Technical Field
The application relates to the technical field of infusion monitors, in particular to an intelligent infusion monitor control method based on accurate control of a stepping motor.
Background
Intravenous infusion is a common mode of administration in clinical treatment. According to the medicine property and the physique of patients, the intravenous transfusion speed is different. The expected treatment effect is difficult to achieve when the infusion is too fast and too slow, and even the nursing safety is influenced. At present, a common transfusion system widely applied in clinic mainly depends on liquid level difference pressure to input liquid to a receptor, and a nursing staff visually observes and manually adjusts a wheel clamp to control the transfusion speed. The common transfusion device lacks functions of blocking alarm, bubble alarm, liquid transfusion alarm and the like, so that clinical nursing burden is increased; and the liquid bottle is easy to introduce outside air to pollute liquid. The infusion pump is an instrument capable of controlling the number of infusion drops or the infusion flow rate, guaranteeing that the medicine can be uniformly and accurately and safely enter a patient body to play a role, and is an intelligent infusion device, the infusion speed is not influenced by human back pressure and operators, the infusion is accurate and reliable, the clinical nursing working intensity is reduced, and the infusion accuracy, safety and nursing quality are improved.
At present, the existing infusion pump adopts a photoelectric type or gravity type to detect liquid, the photoelectric type infusion pump has high power consumption and cannot be applied to occasions needing light shielding, the gravity type infusion pump has large error and cannot monitor the state of liquid drops, the direct current motor is adopted to clamp or release the operation of an infusion tube, the adjusting precision is low, the exact position of a sliding block cannot be mastered, and the flexible and rapid adjustment according to the current dropping speed cannot be realized.
Disclosure of Invention
The application provides a control method of an intelligent transfusion monitor based on a stepping motor for precisely controlling the dropping speed, which is characterized in that the stepping motor is matched with a corresponding algorithm to control the advance and the retreat of a sliding block, so that the accuracy is high, and the intelligent transfusion monitor is flexible and convenient.
In order to solve the technical problems, the application adopts the following technical scheme:
an intelligent transfusion monitor control method based on a stepping motor for accurately controlling the dripping speed comprises the following steps:
step 1: setting a target dropping speed of an intelligent transfusion monitor;
step 2: acquiring the current dropping speed of the intelligent transfusion monitor, and calculating an adjustment proportion basic value based on the difference value of the current dropping speed and the target dropping speed of the intelligent transfusion monitor;
step 3: adjusting the basic value of the adjusting proportion based on the target dropping speed value of the intelligent transfusion monitor to form a corrected adjusting proportion;
step 4: setting an adjusting step number base value of a stepping motor based on the current dropping speed of the intelligent transfusion monitor;
step 5: the stepping motor adjusts the step number of the stepping motor based on the adjustment step number basic value and the corrected adjustment proportion, so as to adjust the clamping state of the intelligent transfusion monitor;
step 6: acquiring the current dropping speed of the adjusted intelligent transfusion instrument, judging whether the difference between the current dropping speed and the target dropping speed is within an allowable error range, and stopping adjustment and stopping the stepping motor at the existing position if the difference is within the allowable error range; otherwise, repeating the steps 2-4, and carrying out fine adjustment on the adjustment ratio value and the ratio basic value until the difference between the infusion speed of the infusion monitor and the target infusion speed reaches the allowable error range.
Further, the intelligent transfusion monitor comprises a monitor body, the front of the monitor body is provided with a cavity for accommodating a drip chamber of a transfusion tube, holes for the drip chamber to freely pass through are respectively arranged above and below the cavity on the monitor body, metal foils are arranged on two sides of the drip chamber, a capacitance sensor is arranged on the monitor body and positioned at the middle upper position of the cavity, the capacitance sensor records the real-time capacitance value of the metal foils and feeds the real-time capacitance value back to a processor, and the processor judges whether drip liquid passes through or not according to whether the received capacitance value exceeds a threshold value and records the time interval between two adjacent drip liquids as the drip speed of the next drip liquid.
Preferably, the calculating of the current dropping speed in the step 2 includes the following steps:
step 2.1: the weight of each dropping liquid is calculated by weight,
S wi ＝ω i S i +ω i-1 S i-1 +…+ω i-a+1 S i-a+1 (1)
wherein S is wi Represents the weighted speed of the ith drop, S i Represents the drop velocity of the ith drop, closest to the current moment, omega i The weight of the ith drip is represented, a is the number of the weighted dripping speeds, a is constant and is more than or equal to 3,
the weights satisfy the following conditions:
ω i +ω i-1 +…+ω i-a+1 ＝1 (2)
ω i ＞ω i-1 ＞…＞ω i-a+1
step 2.2: the extreme one of the a drop rates is removed:
wherein S is n The extreme drop velocity is the drop velocity of the nth index, i-a+1 is not less than n and not more than i, S M The median value of the a drip speeds is represented, E represents the acceptability of the difference degree, namely, when the difference degree is smaller than E, the difference degree is in an acceptable range, and when the difference degree is larger than E, the difference degree is overlarge, and E is a constant;
step 2.3: on the basis of the step 2.2, calculating the average value of the residual dropping speed, namely the current dropping speed:
wherein,for the current dropping speed, b represents the number of extreme dropping speeds, S nx Represents the x-th extreme drop velocity, S ωx The weighted drop rate representing the x-th drop rate.
Further, the basic value of the adjustment ratio in the step 2 is:
wherein k represents an adjustment ratio basic value, S is the current dropping speed, S * For the target drop velocity, δ is the allowable error, which is a constant, 0 < δ < 1.
Preferably, step 3 includes:
①S * ≥S 1 when k is i =1/4 k, where k i To be corrected afterAdjusting the proportion S 1 A first threshold value of the dripping speed is a constant;
②S * ≤S 2 when k is i =1/2 k, where S 1 A second threshold value for the drop velocity, which is a constant;
③S 1 ＜S * ＜S 2 when k is i ＝k。
Preferably, the back of monitor body is equipped with the pipe guide way that is used for supplying the transfer line pipe passes through, be equipped with the slider in the pipe guide way, the slider passes through step motor control movement position and direction.
Further, the adjustment step number base value of the step 4 stepper motor is as follows:
P m ＝11g (6)
wherein P is m Representing the basic value of the number of adjustment steps, S being the current dropping speed, g being the group number, (1) g=8 when 0 < S < 750, (2) g=7 when 750.ltoreq.s < 857, (3) g=6 when 857.ltoreq.s < 1000, (4) g=5 when 1000.ltoreq.s < 1200, (5) g=4 when 1200.ltoreq.s < 1500, (6) g=3 when 1500.ltoreq.s < 2000, and (7) g=2 when S > 2000.
Preferably, the step number of the stepping motor in step 5 satisfies the following formula:
P′ i ＝P i +k i P m (7)
wherein P' i Indicating the position of the stepping motor after the step number is adjusted, P i Indicating the position of the stepping motor before the number of steps is not adjusted.
Preferably, the discrimination formula for termination of adjustment is:
wherein S' represents the current dropping speed after the stepping motor is adjusted.
Further preferably, the fine tuning formula is:
(1) when S '< 1200ms, and S' > S * At the time of k' i ＝1，P’ m ＝1/2P m ，
(2) When S '< 1200ms, and S' < S * At the time of k' i ＝-1，P’ m ＝1/2P m ，
Wherein k' i Representing the adjusted proportion of fine tuning, P' m Representing the base value of the fine tuning step.
The application has the beneficial effects that:
the application provides a control method of an intelligent transfusion monitor based on a stepping motor for accurately controlling the dropping speed, which solves the problem that the tilting and dropping states of the transfusion monitor cannot be monitored in the prior art, and the six-axis sensor is used for measuring the attitude angle and the acceleration, so that whether the transfusion monitor tilts or drops is judged through an attitude angle tilting state judging formula and an acceleration dropping state judging formula, and then early warning is carried out, and the control method is safe and reliable.
1. In order to accurately detect liquid dripping, the application adopts the capacitance sensor, controls the reference value of the capacitance value to change along with the environment, sets the threshold value, and considers that liquid drops are dripped when the capacitance value obviously changes to exceed the threshold value. The technical schemes for solving the similar problems in the market are generally photoelectric and gravity type, wherein the photoelectric type adopts a photoelectric switch, one end of the photoelectric switch emits infrared light, the other end of the photoelectric switch receives the infrared light, and the photoelectric switch judges the dripping of liquid drops through light shielding, so that the photoelectric switch has high power consumption and cannot be applied to occasions needing light shielding; the gravity type can only estimate the residual liquid capacity by measuring the weight of the infusion bottle, the error is large, and the state of liquid drops cannot be monitored.
2. In order to realize accurate adjustment of the dropping speed, the application adopts the stepping motor and the sliding block, and the stepping motor accurately controls the advancing and retreating of the sliding block, thereby controlling the clamping or loosening state of the dropper. In order to quickly and accurately regulate the dripping speed, various algorithms are used in the speed measurement and regulation process, so that the speed measurement is more accurate, and the speed regulation process is more rapid.
3. The application reduces the adjusting speed of the stepping motor by the algorithm setting of adjusting proportion and adjusting step number, and greatly improves the adjusting efficiency of the intelligent transfusion monitor.
4. According to the application, the current dropping speed is solved by weighting and removing the extreme value, and the influence caused by the extreme value and the water drop abnormality is deducted.
5. According to the application, through correction of the adjustment proportion, the adjustment steps of the stepping motor are reduced, the occurrence of overshoot is greatly reduced, and the overall efficiency is effectively improved.
Drawings
FIG. 1 is a flow chart of the steps provided by the present application;
FIG. 2 is a front view of the intelligent infusion monitor of the present application;
FIG. 3 is a rear view of the intelligent infusion monitor of the present application;
1-infusion tube, 2-dropping funnel, 3-cavity, 4-hole, 5-capacitance sensor, 6-display screen, 7-pipe guide slot, 8-slider, 9-monitor body.
Detailed Description
The control method of the intelligent transfusion monitor based on the accurate control of the dropping speed of the stepping motor is further described in detail below with reference to the accompanying drawings and the specific implementation method.
Example 1
As shown in fig. 1, the control method of the intelligent transfusion monitor based on the accurate control of the dropping speed of the stepping motor comprises the following steps:
step 1: setting a target dropping speed of an intelligent transfusion monitor;
step 2: acquiring the current dropping speed of the intelligent transfusion monitor, and calculating an adjustment proportion basic value based on the difference value of the current dropping speed and the target dropping speed of the intelligent transfusion monitor;
step 3: adjusting the basic value of the adjusting proportion based on the target dropping speed value of the intelligent transfusion monitor to form a corrected adjusting proportion;
step 4: setting an adjusting step number base value of a stepping motor based on the current dropping speed of the intelligent transfusion monitor;
step 5: the stepping motor adjusts the step number of the stepping motor based on the adjustment step number basic value and the corrected adjustment proportion, so as to adjust the clamping state of the intelligent transfusion monitor;
step 6: acquiring the current dropping speed of the adjusted intelligent transfusion instrument, judging whether the difference between the current dropping speed and the target dropping speed is within an allowable error range, and stopping adjustment and stopping the stepping motor at the existing position if the difference is within the allowable error range; otherwise, repeating the steps 2-4, and carrying out fine adjustment on the adjustment ratio value and the ratio basic value until the difference between the infusion speed of the infusion monitor and the target infusion speed reaches the allowable error range.
Preferably, the back of the monitor body 9 is provided with a guide pipe guiding groove 7 for the guide pipe of the infusion pipe 1 to pass through, the guide pipe guiding groove 7 has no edge angle, a sliding block 8 is arranged in the guide pipe guiding groove 7, and the sliding block 8 controls the moving position and the moving direction through a stepping motor. The application adopts the stepping motor to push the sliding block to clamp or release the infusion tube, the stepping motor is controlled by the professional driving chip, the stepping motor is positioned by the absolute position, the error of the stepping forward and backward is small, the positioning and adjusting precision is high, and the speed and the strength can be flexibly controlled. The equipment of the same type generally adopts a direct current motor scheme, the forward and backward distance is controlled by the power-on time, the adjusting frequency is generally fixed, the adjusting precision is low in such a way, the exact position of the sliding block cannot be mastered, and the flexible and rapid adjustment according to the current dropping speed cannot be realized.
Further, the basic value of the adjustment ratio in the step 2 is:
wherein k represents an adjustment ratio basic value, S is the current dropping speed, S * For the target drop velocity, δ is the allowable error, which is a constant, 0 < δ < 1. Here, δ takes an engineer experience value of 10%.
Preferably, step 3 includes:
①S * ≥S 1 when k is i =1/4 k, where k i For the corrected adjustment ratio S 1 A first threshold of the dripping speed, which is a constant, where S 1 Take the empirical value of 25000ms，
②S * ≤S 2 When k is i =1/2 k, where S 2 A second threshold of drop velocity, which is a constant, where S 2 Taking an empirical value of 6000/5ms;
③S 1 ＜S * ＜S 2 when k is i ＝k。
Further, the adjustment step number base value of the step 4 stepper motor is as follows:
P m ＝11g (6)
wherein P is m Representing the basic value of the number of adjustment steps, S being the current dropping speed, g being the group number, (1) g=8 when 0 < S < 750, (2) g=7 when 750.ltoreq.s < 857, (3) g=6 when 857.ltoreq.s < 1000, (4) g=5 when 1000.ltoreq.s < 1200, (5) g=4 when 1200.ltoreq.s < 1500, (6) g=3 when 1500.ltoreq.s < 2000, and (7) g=2 when S > 2000.
Preferably, the step number of the stepping motor in step 5 satisfies the following formula:
P′ i ＝P i +k i P m (7)
wherein P' i Indicating the position of the stepping motor after the step number is adjusted, P i Indicating the position of the stepping motor before the number of steps is not adjusted.
Preferably, the discrimination formula for termination of adjustment is:
wherein S' represents the current dropping speed after the stepping motor is adjusted.
Further preferably, the fine tuning formula is:
(1) when S '< 1200ms, and S' > S * At the time of k' i ＝1，P’ m ＝1/2P m ，
(2) When S '< 1200ms, and S' < S * At the time of k' i ＝-1，P’ m ＝1/2P m ，
Wherein k' i Representing the adjusted proportion of fine tuning, P' m Representing the base value of the fine tuning step.
After the application is regulated to a specified speed, the regulation is stopped, and normal transfusion is started; restarting to regulate the dripping speed if the dripping speed is found to exceed the designated range in the process of transfusion; if the first speed regulation can not reach the designated dropping speed, reporting failure of speed regulation and locking; if the speed cannot reach the designated speed, reporting the current dripping speed to be too fast or too slow and locking; reporting the stopping of the liquid drops and locking the liquid drops when the stopping of the liquid drops is detected in normal transfusion; and when the liquid drop is detected to stop in the speed regulation period, the liquid drop enters a state of retreating detection of the liquid drop, the liquid level is detected, and if the liquid flowing light in the dropper is found, the liquid drop is reported to stop and lock.
Example 2
Example 2 differs from example 1 only in that: and solving the current dropping speed by weighting and removing the extreme value, and deducting the influence caused by the extreme value and the water drop adhesion.
Specifically, preferably, the calculation of the current dropping speed in the step 2 includes the following steps:
step 2.1: the weight of each dropping liquid is calculated by weight,
S wi ＝ω i S i +ω i-1 S i-1 +…+ω i-a+1 S i-a+1 (1)
wherein S is wi Represents the weighted speed of the ith drop, S i Represents the drop velocity of the ith drop, closest to the current moment, omega i The weight of the ith drip is represented, a is the number of the weighted dripping speeds, a is constant and is more than or equal to 3,
the weights satisfy the following conditions:
ω i +ω i-1 +…+ω i-a+1 ＝1 (2)
ω i ＞ω i-1 ＞…＞ω i-a+1
preferably omega i ＝(a-1)/a。
Step 2.2: the extreme one of the a drop rates is removed:
wherein S is n The extreme drop velocity is the drop velocity of the nth index, i-a+1 is not less than n and not more than i, S M A median value of the a drip speeds is represented, E represents the acceptability of the difference degree, namely, when the difference degree is smaller than E, the difference degree is in an acceptable range, when the difference degree is larger than E, the difference degree is overlarge, E is a constant, and E is preferably any real number between 5 and 8;
step 2.3: on the basis of the step 2.2, calculating the average value of the residual dropping speed, namely the current dropping speed:
wherein,for the current dropping speed, b represents the number of extreme dropping speeds, S nx Represents the x-th extreme drop velocity, S ωx The weighted drop rate representing the x-th drop rate.
Example 3
Example 3 differs from example 1 only in that: the current dropping speed can be obtained by detecting the dropping of the liquid drops through the capacitance sensor and recording the time between two drops, the distance required to advance is calculated based on the difference value between the current speed and the target speed, and then the stepping motor is driven to push the sliding block to achieve the accurate position.
Specifically, intelligent transfusion monitor includes monitor body 9, monitor body 9's front is equipped with the cavity 3 that is used for holding dropping funnel 2 of transfer line 1, monitor body 9 is last and be located the top and the below of cavity 3 are equipped with respectively and supply dropping funnel 2 freely walks through hole 4, monitor body 9 is last and be located the well intermediate position of cavity 3 is equipped with capacitive sensor 5, capacitive sensor 5 records cavity horizontal direction's real-time capacitance value to feed back real-time capacitance value to the treater, whether the treater is according to whether the received capacitance value exceeds the threshold value, judges whether there is the dropping liquid to pass through, and the time interval between two adjacent dropping liquids of record is as the dropping speed of later dropping liquid. It should be noted here that the distance of the stepping motor used in the present application varies to 3-4mm every 3 ten thousand steps.
In order to accurately detect liquid dripping, the application adopts the capacitance sensor, controls the reference value of the capacitance value to change along with the environment, sets the threshold value, and considers that liquid drops are dripped when the capacitance value obviously changes to exceed the threshold value.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
While the application has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the application as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit thereof. The disclosure of the present application is intended to be illustrative, but not limiting, of the scope of the application.
The foregoing is only a preferred embodiment of the application, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the application.
Claims (6)
1. The intelligent transfusion monitor control method based on the accurate control of the dropping speed of the stepping motor is characterized by comprising the following steps:
step 1: setting a target dropping speed of an intelligent transfusion monitor;
step 2: acquiring the current dropping speed of the intelligent transfusion monitor, and calculating an adjustment proportion basic value based on the difference value of the current dropping speed and the target dropping speed of the intelligent transfusion monitor;
step 3: adjusting the basic value of the adjusting proportion based on the target dropping speed value of the intelligent transfusion monitor to form a corrected adjusting proportion;
step 4: setting an adjusting step number base value of a stepping motor based on the current dropping speed of the intelligent transfusion monitor;
step 5: the stepping motor adjusts the step number of the stepping motor based on the adjustment step number basic value and the corrected adjustment proportion, so as to adjust the clamping state of the intelligent transfusion monitor;
step 6: acquiring the current dropping speed of the adjusted intelligent transfusion instrument, judging whether the difference between the current dropping speed and the target dropping speed is within an allowable error range, and stopping adjustment and stopping the stepping motor at the existing position if the difference is within the allowable error range; otherwise, repeating the steps 2-4, and carrying out fine adjustment on the adjustment ratio value and the ratio basic value until the difference between the drip speed of the infusion monitor and the target drip speed reaches the allowable error range;
the intelligent transfusion monitor comprises a monitor body (9), a cavity (3) for accommodating a drip chamber (2) of a transfusion tube (1) is arranged on the front surface of the monitor body (9), metal foils are arranged on two sides of the drip chamber (2), holes (4) for the drip chamber (2) to freely pass through are respectively arranged on the monitor body (9) and above and below the cavity (3), a capacitance sensor (5) is arranged on the monitor body (9) and in the middle-upper position of the cavity (3), the capacitance sensor (5) records a real-time capacitance value of the metal foils and feeds the real-time capacitance value back to a processor, the processor judges whether drip passes or not according to whether the received capacitance value exceeds a threshold value, and records a time interval between two adjacent drips as the drip speed of the next drip, and the display screen (6) is further arranged on the monitor body (9) and used for displaying the drip speed;
the current dropping speed calculation in the step 2 comprises the following steps:
step 2.1: the weight of each dropping liquid is calculated by weight,
S wi ＝ω i S i +ω i-1 S i-1 +…+ω i-a+1 S i-a+1 (1)
wherein S is wi Represents the weighted speed of the ith drop, S i Represents the drop velocity, ω, of the ith drop i The weight of the ith drip is represented, a is the number of the weighted dripping speeds, a is constant and is more than or equal to 3,
the weights satisfy the following conditions:
ω i +ω i-1 +…+ω i-a+1 ＝1 (2)
ω i ＞ω i-1 ＞…＞ω i-a+1
step 2.2: the extreme one of the a drop rates is removed:
wherein S is n The extreme drop velocity is the drop velocity of the nth index, i-a+1 is not less than n and not more than i, S M The median value of the a drip speeds is represented, E represents the acceptability of the difference degree, namely, when the difference degree is smaller than E, the difference degree is in an acceptable range, and when the difference degree is larger than E, the difference degree is overlarge, and E is a constant;
step 2.3: on the basis of the step 2.2, calculating the average value of the residual dropping speed, namely the current dropping speed:
wherein,for the current dropping speed, b represents the number of extreme dropping speeds, S nx Represents the x-th extreme drop velocity, S ωx A weighted drop rate representing an xth drop rate;
wherein, the basic value of the adjusting proportion in the step 2 is as follows:
wherein k represents an adjustment ratio basic value, S is the current dropping speed, S * For the target drop velocity, delta is the allowable error, is a constant, 0<δ＜1；
Wherein, step 3 includes:
①S * ≥S 1 when k is i =1/4 k, where k i For the corrected adjustment ratio S 1 A first threshold value of the dripping speed is a constant;
②S * ≤S 2 when k is i =1/2 k, where S 2 A second threshold value for the drop velocity, which is a constant;
③S 1 ＜S * ＜S 2 when k is i ＝k。
2. The intelligent transfusion monitor control method based on the stepping motor for precisely controlling the dropping speed according to claim 1, wherein a catheter guide groove (7) for the catheter of the transfusion tube (1) to pass through is arranged on the back surface of the monitor body (9), a sliding block (8) is arranged in the catheter guide groove (7), and the sliding block (8) controls the moving position and the moving direction through the stepping motor.
3. The intelligent transfusion monitor control method based on the accurate control of the dropping speed of the stepping motor according to claim 2, wherein the adjustment step number base value of the stepping motor in the step 4 is as follows:
P m ＝11g (6)
wherein P is m Representing the basic value of the number of adjustment steps, S being the current dropping speed, g being the group number, (1) g=8 when 0 < S < 750, (2) g=7 when 750.ltoreq.s < 857, (3) g=6 when 857.ltoreq.s < 1000, (4) g=5 when 1000.ltoreq.s < 1200, (5) g=4 when 1200.ltoreq.s < 1500, (6) g=3 when 1500.ltoreq.s < 2000, and (7) g=2 when S > 2000.
4. The intelligent transfusion monitor control method based on the accurate control of the dropping speed of the stepping motor according to claim 3, wherein the stepping motor step number in the step 5 satisfies the following formula:
P′ i ＝P i +k i P m (7)
wherein P' i Indicating the position of the stepping motor after the step number is adjusted, P i Indicating the position of the stepping motor before the number of steps is not adjusted.
5. The intelligent transfusion monitor control method based on the accurate control of the dropping speed by the stepping motor according to claim 4, wherein the judging formula of the termination of the adjustment is:
wherein S' represents the current dropping speed after the stepping motor is adjusted.
6. The control method of the intelligent transfusion monitor based on the accurate control of the dropping speed by the stepping motor according to claim 5, wherein the fine tuning formula is:
(1) when S '< 1200ms, and S' > S * At the time of k' i ＝1，P’ m ＝1/2P m ，
(2) When S '< 1200ms, and S' < S * At the time of k' i ＝-1，P’ m ＝1/2P m ，
Wherein k' i Representing the adjusted proportion of fine tuning, P' m Representing the base value of the fine tuning step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111128066.5A CN113855915B (en) | 2021-09-26 | 2021-09-26 | Intelligent transfusion monitor control method based on stepping motor accurate control of dropping speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111128066.5A CN113855915B (en) | 2021-09-26 | 2021-09-26 | Intelligent transfusion monitor control method based on stepping motor accurate control of dropping speed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113855915A CN113855915A (en) | 2021-12-31 |
| CN113855915B true CN113855915B (en) | 2023-11-14 |
Family
ID=78994439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111128066.5A Active CN113855915B (en) | 2021-09-26 | 2021-09-26 | Intelligent transfusion monitor control method based on stepping motor accurate control of dropping speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113855915B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114452482B (en) * | 2022-02-10 | 2023-12-29 | 江苏爱朋医疗科技股份有限公司 | Infusion drip speed adjusting method, infusion control system and infusion equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208243856U (en) * | 2016-12-23 | 2018-12-18 | 南京信息工程大学 | A kind of SCM Based liquid dripping speed monitoring device |
| CN113274583A (en) * | 2021-05-26 | 2021-08-20 | 北京大学第三医院（北京大学第三临床医学院） | Injection management system with multi-parameter configuration |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103562730B (en) * | 2011-06-09 | 2015-09-16 | 富士通株式会社 | Whereabouts decision maker and whereabouts decision method |
| WO2016077534A1 (en) * | 2014-11-12 | 2016-05-19 | The General Hospital Corporation | Flow rate measurement and control of infusion devices |
-
2021
- 2021-09-26 CN CN202111128066.5A patent/CN113855915B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208243856U (en) * | 2016-12-23 | 2018-12-18 | 南京信息工程大学 | A kind of SCM Based liquid dripping speed monitoring device |
| CN113274583A (en) * | 2021-05-26 | 2021-08-20 | 北京大学第三医院（北京大学第三临床医学院） | Injection management system with multi-parameter configuration |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113855915A (en) | 2021-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2136419C (en) | Blood extraction flow control calibration system and method | |
| EP0610418B1 (en) | Method for liquid flow measuring and apparatus to practise this method | |
| CN109562225B (en) | Infusion flow adjusting device | |
| US10300197B2 (en) | Dropping rate measuring device, dropping rate controller, drip infusion device, and liquid droplet volume measuring device | |
| JP3243641B2 (en) | Blood extraction and reinfusion flow control system and method | |
| EP3277341B1 (en) | Iv flow management systems and methods | |
| EP1964584B1 (en) | Positive pressure infusion system having downstream resistance measurement capability | |
| CN113855915B (en) | Intelligent transfusion monitor control method based on stepping motor accurate control of dropping speed | |
| KR101327862B1 (en) | Flow rate correction device for setting infusion flow rate and method for optimum flow rate regulation using discharge coefficientt of iv flow regulator | |
| EP1428541B1 (en) | Infusion fluid container support with adjustable height | |
| US20200360604A1 (en) | Gravity Infusion Control System | |
| EP2644215A1 (en) | Apparatus for extracorporeal treatment of blood | |
| EP0135509A1 (en) | Intermittent drop detecting method and apparatus | |
| CN101579544A (en) | Automatically regulating infusion method and device | |
| KR101532613B1 (en) | Automatic flow rate control system of intravenous fluid | |
| KR20160149927A (en) | Device for automatically adjusting medication-speed of infusion solution | |
| JP6797405B2 (en) | Droplet volume estimation device and infusion device | |
| US4338932A (en) | Method and apparatus for fluid flow control | |
| KR20150125484A (en) | Apparatus and method for automatically regulating flow rate | |
| CN113663156A (en) | Intelligent infusion nursing system based on multi-sensor fusion technology | |
| CN115300708A (en) | Injection speed self-adaptive adjusting device and method of full-automatic contrast injection instrument | |
| CN210644757U (en) | Infusion apparatus flow velocity detection device | |
| JPH03244468A (en) | Transfused liquid monitoring device | |
| CN108392694A (en) | A kind of medical infusion stand with liquid flow control function | |
| CN108421120A (en) | A kind of pharmaceutical drugs flow velocity intelligence adjusting infusion support |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |