CN109260548B - Infusion drop speed detection method, infusion control method and infusion detector - Google Patents
Infusion drop speed detection method, infusion control method and infusion detector Download PDFInfo
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- CN109260548B CN109260548B CN201811299931.0A CN201811299931A CN109260548B CN 109260548 B CN109260548 B CN 109260548B CN 201811299931 A CN201811299931 A CN 201811299931A CN 109260548 B CN109260548 B CN 109260548B
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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
- A61M5/16804—Flow controllers
- A61M5/16813—Flow controllers by controlling the degree of opening of the flow line
-
- 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
-
- 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
Abstract
The invention discloses an infusion drop rate detection method, an infusion control method and an infusion detector, wherein the drop rate detection method comprises the following steps: sequentially obtaining the instantaneous dropping speeds of N drops according to a preset sampling time interval rule; respectively obtaining a drop velocity deviation value corresponding to each drop except the first drop in the N drops; acquiring the dropping speed of each drop except the first drop after the limiting filter treatment in the N drops; calculating the average value of the dropping speeds of N drops after the limiting filtering treatment and taking the average value as a drop speed detection value of the N drops at the current moment; and calculating the drop velocity detection value of each drop collected later at the current moment in sequence according to the steps. The method realizes a brand new mode of detecting the infusion drip speed, and the acquired drip speed is processed through amplitude limiting filtering, so that the obtained drip speed result is more reliable and more consistent with the actual situation.
Description
Technical Field
The invention belongs to the technical field of infusion control, and particularly relates to an infusion dropping speed detection method, an infusion control method and an infusion detector.
Background
Intravenous infusion is the most commonly used and important means of assisting in the treatment of disease in clinical medical work. In the traditional clinical infusion process, a nurse is generally adopted to monitor the infusion process, and the dripping speed is estimated by the nurse according to experience, so that uncertainty exists in the result. In order to solve the uncertainty of judgment, the existing automatic detection method for the drip speed monitors the quantity of the drip in a period of time or monitors the time between two adjacent drips by means of infrared detection and the like, and then calculates the drip speed, and the automatic detection of the drip speed is realized by the method, but in practice, the automatic detection result of the drip speed is easily interfered by external environments such as external illumination, shaking of a transfusion tube and the like, so that a large difference exists between the automatic detection result and the actual drip speed, and the reliability of the detection result still needs to be further improved.
Disclosure of Invention
The invention aims to provide an infusion drip speed detection method, an infusion control method and an infusion detector, which realize a brand new mode of detecting infusion drip speed, and the acquired drip speed is processed through amplitude limiting filtering, so that the obtained drip speed result is more reliable and more consistent with the actual situation.
Firstly, the invention provides a method for detecting infusion drop velocity, which comprises the following steps:
s1: sequentially obtaining the instantaneous dropping speeds of N drops according to a preset sampling time interval rule, wherein N is a positive integer;
the sampling time interval is the interval time of two collected drops;
s2: respectively obtaining a drop velocity deviation value corresponding to each drop except the first drop in the N drops;
the calculation formula of the drop velocity deviation value is as follows:
wherein A is i Is the drop velocity deviation value, v, of the ith drop i The instant dropping speed of the ith dropping liquid is the instant dropping speed of the ith dropping liquid;
s3: acquiring the dropping speed of each drop except the first drop after the limiting filter treatment in the N drops;
the method comprises the steps of carrying out filtering treatment on the dripping speed of each dripping liquid after amplitude limiting filtering treatment based on the corresponding dripping speed deviation value of the dripping liquid, and taking the dripping speed value of the current dripping liquid as the instantaneous dripping speed of the current dripping liquid when the absolute value of the difference between the instantaneous dripping speeds of the current dripping liquid and the previous dripping liquid is smaller than or equal to the dripping speed deviation value of the current dripping liquid; otherwise, the value is the instantaneous dropping speed of the previous drop;
in the formula, v di The dripping speed after the i-th dripping liquid limiting filtering treatment is the dripping speed;
s4: calculating the average value of the dropping speeds of N drops after the limiting filtering treatment and taking the average value as a drop speed detection value of the N drops at the current moment;
s5: and (3) sequentially calculating the drop speed detection value of each drop at the current moment acquired later according to the method of S1-S4.
The limiting filter set by the invention is to set the maximum deviation value allowed by the instantaneous drop velocity obtained by twice sampling, when the deviation between the instantaneous drop velocity of the current sampling and the instantaneous drop velocity of the last sampling is larger than the set drop velocity deviation value of the current drop, the instantaneous drop velocity of the last sampling is taken, otherwise, the instantaneous drop velocity of the current sampling is taken. The excessive change in the drop velocity of a certain drop caused by the disturbance of the external environment is eliminated by setting the drop velocity deviation value. On the other hand, in the practical test, the invention finds that under different dropping speeds, the influence of the external environment on the dropping speed is different, and the larger the speed is, the smaller the influence of the change of the external environment on the change of the dropping speed is, so that the invention sets different drop speed deviation values for different instantaneous dropping speeds of the dropping liquid, and the practical situation of each limiting filtering treatment and the dropping speed of the dropping liquid are more consistent.
Further preferably, the preset sampling time interval is as follows:
a: the sampling time interval between the second drip and the first drip is a preset initial value;
b: the sampling time interval between the other droplets except the second droplet and the first droplet is calculated according to the following formula:
wherein Δt is i For the sampling time interval between the i-th drop and the i+1-th drop, deltav i Is the instantaneous drop velocity difference between the ith drop and the (i-1) th drop.
In the sampling process, dynamically adjusting the sampling time according to the speed change, comparing the current acquired speed value with the last speed value, if the difference value change is larger, shortening the sampling time, and if the difference value change is smaller, amplifying the sampling time; by the arrangement, when the dropping speed is changed faster, the probability of missing the dropping liquid of the detection part is greatly reduced.
It is further preferred that the sampling time interval between the second drop and the first drop has a value in the range of [20,50]. Wherein the optimum value is 32ms.
Further preferably, N in the N drops is collected in a range of [5,11]. Wherein, the optimal value is 7 drops.
On the other hand, the invention also provides an infusion control method based on the method, which comprises the following steps:
step 1: detecting whether the current infusion tube is dripped, if so, executing the step 2, otherwise, repeating the step 1;
step 2: detecting the quantity of the drops in the current dropping period and detecting the dropping speed of the drops by adopting the infusion drop speed detection method;
step 3: judging whether the number of the drops in the current dropping period is greater than or equal to Q drops, if so, putting the drops in an infusion state, and executing the step 4; otherwise, returning to the step 1;
wherein Q is a positive integer, the value range is [3,10], and the optimal value is 6 drops;
step 4: judging whether the liquid level is detected by a liquid level detection sensor at the upper position of the infusion funnel, and if not, executing the step 5; otherwise, returning to the step 1;
step 5: judging whether a liquid level is detected by a liquid level detection sensor at the lower position of the infusion funnel, and if not, controlling a gear motor to lock and stop infusion; otherwise, returning to the step 1.
In order to prevent the tube from being flattened or folded and being locked by mistake due to actions such as turning over of a patient in the actual infusion process and to prevent the situation that a motor is locked due to the fact that a sensor is touched by mistake after the infusion tube is installed, the invention adds multiple layers of logic judgment. Firstly, judging whether the infusion is in an infusion state by counting the number of liquid drops, if the infusion is in the infusion state, detecting through liquid level detection sensors at the upper position and the lower position, and if the upper liquid level and the lower liquid level are not detected, locking the motor to stop the infusion. The invention prevents the occurrence of motor locking caused by false touch through multiple logic judgment.
On the other hand, the invention provides an infusion detector based on the infusion drop speed detection method, which comprises
The infrared detection module is electrically connected with the control chip;
the infrared detection module comprises a pair of infrared diodes which are respectively arranged at two sides of the dropping funnel, and is used for collecting the instant dropping speed of the dropping liquid;
the control chip is used for calculating the drop speed detection value of the drop at the current moment according to the methods of the steps S1-S5.
Further preferably, the infusion detector further comprises an upper liquid level detection module, a lower liquid level detection module, a speed reducing motor, a locking slide block and a slide block fixing seat;
the upper liquid level detection module, the lower liquid level detection module and the speed reducing motor are electrically connected with the control chip;
the upper liquid level detection module and the lower liquid level detection module are liquid level detection sensors and are respectively arranged above and below the inlet of the dropping funnel and are respectively used for detecting whether liquid levels exist at the corresponding upper position and lower position;
the speed reducing motor is provided with a screw rod with external threads, the front end of the locking slide block is aligned to the infusion tube, the locking slide block is provided with an opening, an internal thread matched with the external threads of the screw rod is arranged in the opening, and the screw rod is positioned in the opening;
the sliding block fixing seat is fixed on the shell of the transfusion detector, a sliding groove is formed in the sliding block fixing seat, the bottom of the locking sliding block is embedded into the sliding groove, and the screw is driven by the gear motor to rotate and drive the locking sliding block to move back and forth along the sliding groove;
the infrared detection module is used for detecting whether the infusion tube is dropping liquid or not;
the control chip is used for controlling the speed reducing motor to lock so as to stop transfusion when the infrared detection module detects that the transfusion tube is dripped and the quantity of dripped liquid in the current dripping period is larger than or equal to Q drops and the upper liquid level detection module and the lower liquid level detection module do not detect the liquid level
Wherein Q is a positive integer and the value range is [3,10].
The invention puts the dropping funnel between the infrared emission diode and the infrared receiving diode, and can judge whether the current dropping funnel has dropping liquid and the instant dropping speed of the current dropping liquid by utilizing the output level of the infrared detecting circuit. The upper liquid level detection module and the lower liquid level detection module are respectively used for detecting whether transfusion exists at the corresponding positions of the transfusion tube. The motor is controlled by the control chip and receives the instruction of the control chip to control transfusion. When the motor is locked, the transfusion is stopped. According to the invention, the locking slide block moves along the vertical direction of the infusion tube under the drive of the motor, and compresses the infusion tube to achieve the effect of stopping infusion. The control chip is used as a processing center for realizing the infusion drip speed detection method and the algorithm operation and control in the infusion control method.
Further preferably, the upper liquid level detection module is 25mm away from the inlet of the dropping funnel and is positioned above the inlet of the dropping funnel; the lower liquid level detection module is 15mm away from the outlet of the dropping funnel and is positioned between the inlet and the outlet of the dropping funnel.
Further preferably, the intelligent control device further comprises a peripheral circuit module electrically connected with the control chip, wherein the peripheral circuit module is any combination of an external key, an alarm lamp and a buzzer.
Advantageous effects
1. The invention determines the current drip speed by setting the maximum allowable deviation value of the instantaneous drip speed obtained by twice sampling, namely limiting filtering, and takes the instantaneous drip speed of the last sampling when the deviation of the instantaneous drip speed of the current sampling and the instantaneous drip speed of the last sampling is larger than the set drip speed deviation value of the current drip, otherwise takes the instantaneous drip speed of the current sampling. The invention eliminates the overlarge change of the dropping speed of a certain drop caused by the interference of external environment by setting the drop speed deviation value. Meanwhile, different drop velocity deviation values are set for the instantaneous drop velocity of different drops, so that each time of limiting filtering processing is more matched with the actual situation of the drop velocity of the drops.
2. In the sampling process, the invention dynamically adjusts the sampling time according to the speed change, compares the current acquired speed value with the last speed value, shortens the sampling time if the difference value change is larger, and amplifies the sampling time if the difference value change is smaller. When the speed of dripping is changed faster through the arrangement, the probability of missing the dripping of the detection part is greatly reduced.
3. The invention prevents the false locking caused by the tube flattening or folding caused by actions such as turning over of a patient in the actual transfusion process and the false touch of the sensor after the transfusion tube is arranged, thereby preventing the situation of the dead locking of the motor, and the invention has simple operation realization and convenient popularization.
Drawings
FIG. 1 is a schematic block diagram of an infusion detector provided by the present invention;
FIG. 2 is a diagram of an infusion detector according to an embodiment of the present invention, wherein (a), (b), and (c) are diagrams of structures at different angles, respectively;
FIG. 3 is a combined installation diagram of a locking slide block and a motor provided by the embodiment of the invention;
fig. 4 is a diagram of a locked state and an unlocked state of an infusion detector according to an embodiment of the present invention, where (a) is the unlocked state and (b) is the locked state.
Fig. 5 is a flowchart of a method for detecting infusion drop velocity provided by the invention.
FIG. 6 is a flow chart of an infusion control method provided by the present invention;
further description of the reference numerals is as follows:
1. the liquid dropping funnel comprises a liquid dropping funnel body, 2 parts of an upper liquid level detection module, 3 parts of a lower liquid level detection module, 4 parts of an infrared detection module, 5 parts of a speed reducing motor, 6 parts of a screw rod, 7 parts of a locking slide block, 8 parts of a transfusion tube, 9 parts of a button, 10 parts of a slide block fixing seat, 11 parts of a motor fixing seat, 12 parts of a motor pressing block, 13 parts of a shell, 14 parts of a cylinder, 15 parts of a locking slide block limiting part, 16 parts of a semicircular guide groove, 17 parts of a square hole, 18 parts of a rear limiting seat.
Detailed Description
The invention will be further illustrated with reference to examples.
As shown in fig. 1, the invention provides an infusion detector, which comprises an infrared detection module 4, an upper liquid level detection module 2, a lower liquid level detection module 3, a control chip, a speed reducing motor 5 and a peripheral circuit module. The infrared detection module 4, the upper liquid level detection module 2, the lower liquid level detection module 3, the gear motor 5 and the peripheral circuit module are electrically connected with the control chip.
In this embodiment, the control chip is a bluetooth chip, and uses DA14580, where the bluetooth chip may be used as a master control chip and is matched with external hardware to form a single-chip bluetooth product scheme, and may be used for short-distance bidirectional wireless communication. The Bluetooth chip is used as a processing center and is used for running an infusion drip speed detection algorithm and an infusion detection algorithm. On the traditional infusion detector, a matrix keyboard or an independent key circuit is generally adopted for input, but the former is complex in circuit and high in programming difficulty, the latter occupies more IO number, and the other two are poor in expansibility. After the external equipment is connected with the infusion detector, the operation message is sent to the infusion detector according to the message format, so that the corresponding operation can be realized. The hardware structure is simplified, more control information can be sent to the infusion detector according to the requirement in the later period, and the operation expansibility of the device is improved. Meanwhile, by utilizing Bluetooth two-way communication, a nurse can download relevant APP, remotely alarm and eliminate equipment, and stop operations such as transfusion.
Such as a message for closing an alarm: @ AABBCLEAR @;
locking the message that the motor stops transfusion: @ AABBSTOP @;
in addition, in the infusion process, the infusion detector can send the state of the detector to the Bluetooth equipment at the nurse end in real time, as follows:
message head, transfusion state, number of times of sending data packet, total amount of dripping, electric quantity of transfusion detector, speed, alarm type of device and MAC address of Bluetooth device.
The infrared detection module 4 is a pair of infrared diodes, namely an infrared emission diode and an infrared receiving diode respectively, the infrared emission diode can emit infrared radiation with a certain wavelength, and when no drip barrier exists between the infrared emission diode and the infrared receiving diode, the infrared receiving diode is conducted due to the fact that the infrared emission diode receives the infrared radiation, and low level is output; when a drip barrier exists between the infrared emitting diode and the infrared receiving diode, the infrared receiving diode is cut off due to the fact that infrared radiation is received, and a high level is output. According to the invention, the dropping funnel 1 is arranged between the infrared emitting diode and the infrared receiving diode, and whether the current dropping funnel 1 has dropping liquid or not and the instant dropping speed of the current dropping liquid can be judged by utilizing the output level of the infrared detecting circuit.
In this embodiment, the upper liquid level detection module 2 and the lower liquid level detection module 3 are both liquid level detection sensors, and are capacitance liquid level sensors. The capacitance liquid level sensor can convert the measured liquid level change into capacitance change, when the detection position has no liquid, the capacitance is minimum, the generated output is maximum, otherwise, the generated output is minimum, and the program judges whether the liquid level exists currently or not by detecting the output value. Wherein, the upper liquid level detection module 2 and the lower liquid level detection module 3 are respectively arranged above and below the inlet of the dropping funnel 1. In this embodiment, the upper liquid level detection module 2 is 25mm away from the inlet of the dropping funnel 1, and the lower liquid level detection module 3 is 15mm away from the outlet of the dropping funnel and is located between the inlet and the outlet of the dropping funnel 1.
As shown in fig. 2 and 3, the infusion detector further comprises a locking slide block 7, a slide block fixing seat 10, a motor fixing seat 11 and a motor pressing block 12, wherein a speed reducing tooth (not shown) and a screw rod 6 with the length of 10mm are arranged on the speed reducing motor 5, external threads of M4 are arranged on the screw rod 6, the screw rod 6 is driven to rotate by the speed reducing motor 5, the speed reducing motor 5 is changed in speed through a four-stage speed reducing gear, and a screw rod shaft sleeve of M4 is sleeved on a final-stage gear. As shown in fig. 3, the outer contour of the locking slide block 7 is cuboid, and the front end of the cuboid is provided with a taper and is opposite to the infusion tube 8, the taper can prevent the right angle of the front end from being sharp, and meanwhile, the infusion tube is convenient to extrude, and the wall of the infusion tube cannot be damaged. The rear end middle part of cuboid is equipped with cylinder 14, establishes the trompil in this cylinder 14, be equipped with on the pore wall of trompil with screw rod 6 external screw thread assorted M4 internal screw thread, screw rod 6 assemble in the trompil. The sliding block fixing seat 10 is fixed on the shell 13, a sliding groove is formed in the sliding block fixing seat 10, the bottom of the locking sliding block 7 is embedded into the sliding groove, and the locking sliding block 7 moves back and forth along the sliding groove under the rotation driving of the screw rod 6. Furthermore, as shown in fig. 2 (c), a lock slider stopper 15 is provided on the housing 13, and the lock slider stopper 15 is located at the rear end of the lock slider 7. When the motor is unlocked, the locking slide block moves backwards, and the locking slide block limiting piece is used for preventing the motor from moving back to a preset position and giving a signal to the motor, so that the motor stops working and the purpose of unlocking is achieved. For example, if the motor is locked, the locking slider is advanced by 4mm, and the retreating distance is also 4mm.
In order to prevent the locking slider 7 from rocking left and right during the back and forth movement, as shown in fig. 2 (b) and (c), a semicircular guide groove 16 is provided on the housing 13 at a position corresponding to the cylinder 14, an intrados of the semicircular guide groove 16 matches with an extrados of the cylinder 14, and the cylinder 14 is embedded in the semicircular guide groove 16.
In order to facilitate processing and tapping, the invention is provided with a square hole 17 on the locking slide 7, wherein the square hole 17 is positioned at the front end of the cylinder 14.
It should be understood that the control chip can control the gear motor 5 to rotate forward or reverse, and the locking slide block 7 is driven to move forward or backward by the screw rod 6 when the gear motor 5 rotates forward or reverse. Because the front end of the locking slide block 7 is aligned with the infusion tube 8, when the locking slide block 7 moves forwards to the infusion tube 8 to compress the infusion tube 8, the effect of suspending infusion is achieved, and the infusion tube 8 is not conducted; and when the locking slide block 7 moves backwards and does not press the infusion tube 8 any more, the infusion tube 8 is conducted. As shown in fig. 4, wherein (a) shows the unlocking state of the gear motor 5, the infusion tube 8 is in the conducting state; (b) The drawing shows the locked state of the gear motor 5, and the infusion tube 8 is in a non-conducting state. As can be seen from the figure, the front end of the locking slider 7 presses the infusion tube 8. In this embodiment, the length of the internal thread of the cylinder 14 in the locking slide 7 is 8mm.
In order to fix the gear motor 5, the shell 13 is provided with a motor fixing seat 11, a motor pressing block 12 and a rear limit seat 18, as shown in fig. 2 (a) and 3, the motor fixing seat 11 is provided with a screw hole and a fixing hole, wherein the screw 6 of the gear motor 5 passes through the screw hole, and a fixing piece passes through the fixing hole to fix the motor fixing seat 11 and the gear motor 5. The motor briquetting 12 is located gear motor 5 rear end, is equipped with the recess on the motor briquetting 12, and the size of recess and gear motor 5 rear end profile phase-match, and gear motor 5's rear end embedding is in the recess, and motor briquetting 12 and casing 13 protecgulum cooperate and have formed a fixed space, and gear motor 5 is located fixed space to push down gear motor 5, also prevent gear motor 5 from rocking. The rear limit seat 18 is positioned at the tail end of the gear motor 5 and props against the two sides of the gear motor 5 to prevent the gear motor 5 from retreating.
In this embodiment, the peripheral circuit module includes an external key, a warning lamp and a buzzer. The method is mainly used for displaying alarm information and providing a peripheral interface of the operation equipment.
As shown in fig. 5, the present invention provides an infusion drop speed detection method based on the infusion detector, which includes the following steps:
s1: sequentially obtaining the instantaneous dropping speed of 7 drops according to a preset sampling time interval rule;
the sampling time interval is the interval time of two collected drops;
s2: respectively obtaining a drop velocity deviation value corresponding to each drop except the first drop in the 7 drops;
the calculation formula of the drop velocity deviation value is as follows:
wherein A is i Is the drop velocity deviation value, v, of the ith drop i The instant dropping speed of the ith dropping liquid is the instant dropping speed of the ith dropping liquid;
s3: acquiring the dropping speed of each drop except the first drop after the limiting filter treatment in the N drops; when the absolute value of the instantaneous drop velocity difference between the current drop and the previous drop is smaller than or equal to the drop velocity deviation value of the current drop, the drop velocity of the current drop is equal to the instantaneous drop velocity of the current drop; otherwise, the instantaneous dropping speed of the previous drop is equal to that of the previous drop;
in the formula, v di The dripping speed after the i-th dripping liquid limiting filtering treatment is the dripping speed;
s4: calculating the average value of the dropping speeds of the 7 drops after the limiting filtering treatment and taking the average value as a drop speed detection value of the 7 th drop at the current moment;
s5: and (3) sequentially calculating the drop speed detection value of each drop at the current moment acquired later according to the method of S1-S4.
And (3) calculating the drop velocity detection value of the 7 th drop at the current moment according to the steps of S1-S4, collecting the current instantaneous drop velocity of the 8 th drop, calculating the drop velocity deviation value of the 8 th drop in the mode of S2, performing amplitude limiting filter processing, and finally calculating the average value of the drop velocities of the 2 nd-8 th drops after the amplitude limiting filter processing as the 8 th drop velocity detection value. When the current drop velocity detection value is needed to be obtained, the drop velocity detection value is calculated by adopting the mode in S2-S4 according to the instantaneous drop velocity of the previous N drops.
Because actions such as patient turning over can lead to the tube to flatten or fold in the infusion process, even keep somewhere the needle and can the syringe needle jam for a long time, these circumstances can lead to the pipeline to be obstructed to there is not the liquid droplet change, leads to the mistake to lock, need to open the dead motor of lock again, this brings very big inconvenience for patient's use. The invention provides an infusion control method aiming at the situation, which comprises the following steps:
step 1: detecting whether the current infusion tube is dripped, if so, executing the step 2, otherwise, repeating the step 1;
step 2: detecting the number of the drops in the current drop period and detecting the drop speed of the drops by adopting the infusion drop speed detection method. In this example, the drip period is one minute.
Step 3: judging whether the number of the liquid drops in the current liquid drop period is more than or equal to 6 drops, if so, putting the liquid drops in an infusion state, and executing the step 4; otherwise, returning to the step 1. If the number of the drops is less than 6, the number of the drops is 0, and the infusion state is waited for.
Step 4: judging whether the liquid level is detected by a liquid level detection sensor at the upper position of the infusion funnel, and if not, executing the step 5; otherwise, returning to the step 1;
step 5: judging whether a liquid level is detected by a liquid level detection sensor at the lower position of the infusion funnel, and if not, controlling a motor to lock so as to stop infusion; otherwise, returning to the step 1.
By adding the logic judgment, the invention controls the motor to lock up and stops the transfusion only when the transfusion is judged to be in a normal transfusion state and the upper liquid level and the lower liquid level are not existed, thereby preventing the motor from locking up caused by false touch.
It should be emphasized that the examples described herein are illustrative rather than limiting, and that this invention is not limited to the examples described in the specific embodiments, but is capable of other embodiments in accordance with the teachings of the present invention, as long as they do not depart from the spirit and scope of the invention, whether modified or substituted, and still fall within the scope of the invention.
Claims (9)
1. The infusion dropping speed detection method is characterized by comprising the following steps of: the method comprises the following steps:
s1: sequentially obtaining the instantaneous dropping speeds of N drops according to a preset sampling time interval rule, wherein N is a positive integer;
the sampling time interval is the interval time of two collected drops;
s2: respectively obtaining a drop velocity deviation value corresponding to each drop except the first drop in the N drops;
the calculation formula of the drop velocity deviation value is as follows:
wherein A is i Is the drop velocity deviation value, v, of the ith drop i The instant dropping speed of the ith dropping liquid is the instant dropping speed of the ith dropping liquid;
s3: acquiring the dropping speed of each drop except the first drop after the limiting filter treatment in the N drops;
the method comprises the steps of carrying out filtering treatment on the dripping speed of each dripping liquid after amplitude limiting filtering treatment based on the corresponding dripping speed deviation value of the dripping liquid, and taking the dripping speed value of the current dripping liquid as the instantaneous dripping speed of the current dripping liquid when the absolute value of the difference between the instantaneous dripping speeds of the current dripping liquid and the previous dripping liquid is smaller than or equal to the dripping speed deviation value of the current dripping liquid; otherwise, the value is the instantaneous dropping speed of the previous drop;
in the formula, v di The dripping speed after the i-th dripping liquid limiting filtering treatment is the dripping speed;
s4: calculating the average value of the dropping speeds of N drops after the limiting filtering treatment and taking the average value as a drop speed detection value of the N drops at the current moment;
s5: and (3) sequentially calculating the drop speed detection value of each drop at the current moment acquired later according to the method of S1-S4.
2. The infusion drop rate detection method according to claim 1, wherein: the preset sampling time interval rule is as follows:
a: the sampling time interval between the second drip and the first drip is a preset initial value;
b: the sampling time interval between the other droplets except the second droplet and the first droplet is calculated according to the following formula:
wherein Δt is i For the sampling time interval between the i-th drop and the i+1-th drop, deltav i Is the instantaneous drop velocity difference between the ith drop and the (i-1) th drop.
3. The infusion drop rate detection method according to claim 2, wherein: the sampling time interval between the second drop and the first drop is in the range of [20,50].
4. The infusion drop rate detection method according to claim 1, wherein: the range of N values in the N drops is [5,11].
5. An infusion control method based on the infusion drip rate detection method according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
step 1: detecting whether the current infusion tube is dripped, if so, executing the step 2, otherwise, repeating the step 1;
step 2: collecting the quantity of the liquid drops in the current liquid drop period;
step 3: judging whether the number of the drops in the current dropping period is greater than or equal to Q drops, if so, putting the drops in an infusion state, and executing the step 4; otherwise, returning to the step 1;
wherein Q is a positive integer and the value range is [3,10]; step 4: judging whether the liquid level is detected by a liquid level detection sensor at the upper position of the infusion funnel, and if not, executing the step 5; otherwise, returning to the step 1;
step 5: judging whether a liquid level is detected by a liquid level detection sensor at the lower position of the infusion funnel, and if not, controlling a gear motor to lock and stop infusion; otherwise, returning to the step 1.
6. An infusion detector based on the infusion drop rate detection method of any one of claims 1-4, characterized in that: comprising the following steps: the infrared detection module is electrically connected with the control chip;
the infrared detection module comprises a pair of infrared diodes which are respectively arranged at two sides of the dropping funnel, and is used for collecting the instant dropping speed of the dropping liquid;
the control chip is used for calculating the drop speed detection value of the drop at the current moment according to the methods of the steps S1-S5.
7. The infusion detector of claim 6, wherein: the device also comprises an upper liquid level detection module, a lower liquid level detection module, a gear motor, a locking slide block and a slide block fixing seat;
the upper liquid level detection module, the lower liquid level detection module and the speed reducing motor are electrically connected with the control chip;
the upper liquid level detection module and the lower liquid level detection module are liquid level detection sensors and are respectively arranged above and below the inlet of the dropping funnel and are respectively used for detecting whether liquid levels exist at the corresponding upper position and lower position;
the speed reducing motor is provided with a screw rod with external threads, the front end of the locking slide block is aligned to the infusion tube, the locking slide block is provided with an opening, an internal thread matched with the external threads of the screw rod is arranged in the opening, and the screw rod is positioned in the opening;
the sliding block fixing seat is fixed on the shell of the transfusion detector, a sliding groove is formed in the sliding block fixing seat, the bottom of the locking sliding block is embedded into the sliding groove, and the screw is driven by the gear motor to rotate and drive the locking sliding block to move back and forth along the sliding groove;
the infrared detection module is used for detecting whether the infusion tube is dropping liquid or not;
the control chip is used for controlling the speed reducing motor to lock so as to stop transfusion when the infrared detection module detects that the transfusion tube is dripped and the quantity of dripped liquid in the current dripping period is greater than or equal to Q drops and the upper liquid level detection module and the lower liquid level detection module do not detect the liquid level;
wherein Q is a positive integer and the value range is [3,10].
8. The infusion detector of claim 7, wherein: the upper liquid level detection module is 25mm away from the inlet of the dropping funnel and is positioned above the inlet of the dropping funnel; the lower liquid level detection module is 15mm away from the outlet of the dropping funnel and is positioned between the inlet and the outlet of the dropping funnel.
9. The infusion detector of claim 6, wherein: the intelligent control device further comprises a peripheral circuit module electrically connected with the control chip, wherein the peripheral circuit module is any combination of an external key, an alarm lamp and a buzzer.
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