CN114618051A - Liquid conveying device, blockage detection method and device for infusion pipeline and circuit - Google Patents
Liquid conveying device, blockage detection method and device for infusion pipeline and circuit Download PDFInfo
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- CN114618051A CN114618051A CN202210190870.4A CN202210190870A CN114618051A CN 114618051 A CN114618051 A CN 114618051A CN 202210190870 A CN202210190870 A CN 202210190870A CN 114618051 A CN114618051 A CN 114618051A
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- 238000001802 infusion Methods 0.000 title claims abstract description 126
- 239000007788 liquid Substances 0.000 title claims abstract description 51
- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 238000001125 extrusion Methods 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims description 35
- 238000012545 processing Methods 0.000 claims description 20
- 230000000903 blocking effect Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 7
- 230000004044 response Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
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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
- A61M2005/16863—Occlusion detection
Abstract
The invention belongs to the technical field of medical instruments, and discloses a liquid conveying device, a blockage detection method of a transfusion pipeline, a device and a circuit, wherein the device comprises: the device comprises a liquid storage bag, a transfusion hose, a transfusion pump motor, an extrusion block, a hose fitting piece, a flexible pressure sensor and a controller; the infusion hose is connected with the liquid storage bag, an extrusion block is arranged on an output shaft of the infusion pump motor, a U-shaped groove is formed in the hose fitting piece and used for fitting the infusion hose, and a flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose; the controller is connected with the flexible pressure sensor and the infusion pump motor. Has the advantages that: the flexible film pressure sensor is used for measuring the pressure signal when the infusion pipeline is blocked, so that the flexible film pressure sensor is small in size and can be directly stuck on the outer wall of the infusion pipeline, and the direct measurement of the radial pressure of the liquid pipeline is realized.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a liquid conveying device, a blockage detection method of an infusion pipeline, a blockage detection device and a circuit.
Background
The infusion system in the medical appliance industry is a device for accurately controlling the infusion speed and the infusion amount, generally adopts the principle of an electronic micro pump, and utilizes a microcontroller to drive a motor to rotate, so that an extrusion block is driven to act on an infusion catheter, a small amount of liquid medicine is accurately, micro, uniformly and continuously infused into a human body, and the infusion accuracy and safety are greatly improved. However, in the actual use process, due to various factors, the infusion pipeline is pressed, twisted, bent and the like, so that the blockage phenomenon occurs in the infusion process. Once the liquid medicine cannot be output outwards, adverse effects may be caused, so that a blockage phenomenon of the system needs to be found and an alarm needs to be given in time.
The detection of the blocking pressure of the infusion pump in the prior art usually detects indirect physical quantities related to the blocking state, such as the current quantity of a motor, the displacement of a push rod, the friction force of a piston and other physical quantities, so as to infer the blocking state. However, these methods of detecting indirect physical quantities cannot accurately detect the blockage of the infusion line in time.
Disclosure of Invention
The purpose of the invention is: the liquid conveying device, the blockage detection method of the liquid conveying pipeline, the blockage detection device of the liquid conveying pipeline and the circuit are provided, and the blockage situation in the liquid conveying process can be timely and accurately detected.
In order to achieve the above object, the present invention provides a liquid transport apparatus comprising: the device comprises a liquid storage bag, a transfusion hose, a transfusion pump motor, an extrusion block, a hose fitting piece, a flexible pressure sensor and a controller; the infusion hose is connected with the liquid storage bag, an extrusion block is arranged on an output shaft of the infusion pump motor, a U-shaped groove is formed in the hose fitting piece and used for fitting the infusion hose, and a flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose; the controller is connected with the flexible pressure sensor and the infusion pump motor.
Further, the width of the U-shaped groove is twice of the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor, and the radius of the arc part of the U-shaped groove is the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor.
Further, the flexible pressure sensor includes: the finger inserting device comprises finger inserting electrodes, a pressure sensitive film and tail electrodes, wherein the tail electrodes are arranged on two sides of the finger inserting electrodes and are used for being connected with a controller, and the tail electrodes and the finger inserting electrodes are arranged on the pressure sensitive film; the insertion fingers of the insertion finger electrodes are perpendicular to the flowing direction of liquid in the infusion hose.
Further, the controller is used for acquiring pressure data of the infusion hose through the hose fitting and the flexible pressure sensor, filtering the pressure data to obtain a pressure change curve without direct current, judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude of the current pressure period exceeds a preset first threshold value according to the pressure change curve, and performing blocking alarm if the signal amplitude ratio exceeds the first threshold value.
The invention also discloses a blockage detection method of the infusion pipeline, which comprises the following steps:
acquiring pressure data of the infusion hose through a hose fitting piece and a flexible pressure sensor, wherein the hose fitting piece is provided with a U-shaped groove, the U-shaped groove is used for fitting the infusion hose, and the flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose;
filtering the pressure data to obtain a pressure change curve without direct current quantity;
and the second processing module is used for judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude in the current pressure period exceeds a preset first threshold value or not according to the pressure change curve, and performing blocking alarm if the signal amplitude ratio exceeds the first threshold value.
Further, the width of the U-shaped groove is twice of the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor, and the radius of the arc part of the U-shaped groove is the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor.
Further, the flexible pressure sensor includes: the finger inserting device comprises finger inserting electrodes, a pressure sensitive film and tail electrodes, wherein the tail electrodes are arranged on two sides of the finger inserting electrodes and are used for being connected with a controller, and the tail electrodes and the finger inserting electrodes are arranged on the pressure sensitive film; the insertion fingers of the insertion finger electrodes are perpendicular to the flowing direction of liquid in the infusion hose.
The invention also discloses a blockage detection device of the infusion pipeline, which comprises: the device comprises a first acquisition module, a first processing module and a second processing module;
the first acquisition module is used for acquiring pressure data of the infusion hose through a hose fitting piece and a flexible pressure sensor, the hose fitting piece is provided with a U-shaped groove, the U-shaped groove is used for being matched with the infusion hose, and the flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose;
the first processing module is used for filtering the pressure data to obtain a pressure change curve without direct current quantity;
and the second processing module is used for judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude in the current pressure period exceeds a preset first threshold value or not according to the pressure change curve, and performing a blockage alarm if the signal amplitude ratio exceeds the first threshold value.
Further, the detection device further comprises: an infusion pump motor control module;
and when the second processing module gives an alarm of blockage, the infusion pump motor control module controls the infusion pump motor to stop working.
The invention also discloses a blockage detection circuit of the infusion pipeline, which comprises: the pressure sensor comprises a divider resistor, a flexible pressure sensor, a voltage following circuit, a motor and a controller, wherein an ADC (analog to digital converter) module, a timer module and a motor driving module are arranged in the controller;
the first end of the divider resistor is connected with the first end of the flexible pressure sensor, the second end of the flexible pressure sensor is connected with the first end of the voltage follower circuit, the second end of the voltage follower circuit is connected with the first end of the ADC module, and the second end of the ADC module is connected with the timer module; the motor is connected with the motor driving module;
the flexible pressure sensor is attached in a U-shaped groove of a fitting piece for fitting the infusion hose;
the controller is used for acquiring pressure data of the infusion hose through the hose fitting piece and the flexible pressure sensor, and filtering the pressure data to obtain a pressure change curve without direct current quantity; and judging whether the signal amplitude ratio of the current pressure fluctuation amplitude of the current pressure period to the first pressure fluctuation amplitude exceeds a preset first threshold value or not according to the pressure change curve, and performing blockage warning if the signal amplitude ratio exceeds the first threshold value.
Compared with the prior art, the liquid conveying device, the blockage detection method of the liquid conveying pipeline, the device and the circuit have the advantages that:
(1) the flexible film pressure sensor is used for measuring the pressure signal when the infusion pipeline is blocked, so that the flexible film pressure sensor is small in size and can be directly stuck on the outer wall of the infusion pipeline, and the direct measurement of the radial pressure of the liquid pipeline is realized.
(2) According to the invention, the fitting piece with the U-shaped groove capable of being embedded into the pipeline is designed to limit and fix the liquid pipeline, so that the influence of the installation error of the pipeline on the blockage judgment is avoided.
(3) The flexible film pressure sensor is paved at the bottom of the fitting piece, so that the contact area between the pipeline and the sensor is ensured, and the measurement of the blocking state of the elastic pipeline is realized.
(4) The flexible pressure sensor has a piezoresistive strain curve, the resistance value is reduced along with the pressure change, the pipeline pressure value can be obtained by utilizing the linear range of the piezoresistive curve of the sensor, and the pressure value in the measured pipeline path direction can be obtained by designing a circuit matched with the sensor. And then, the radial pressure jitter amplitude of the pipeline is calculated in real time through a software processing algorithm, so that a blocking signal can be judged.
(5) And a filter is designed according to the working frequency of the pump, so that noise interference is removed, and the accuracy of data can be improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a liquid delivery device according to the present invention;
FIG. 2 is a schematic diagram of a flexible pressure sensor of a fluid delivery device according to the present invention;
FIG. 3 is a schematic view of a hose fitting of the fluid delivery device of the present invention;
FIG. 4 is a schematic diagram of a first flow of a method for detecting an occlusion in an infusion line according to the present invention;
FIG. 5 is a schematic diagram of a second process of the blockage detection method for an infusion pipeline according to the present invention;
FIG. 6 is a schematic structural diagram of an obstruction detection device for an infusion pipeline according to the present invention;
FIG. 7 is a schematic diagram of a block detection circuit of an infusion pipeline according to the present invention.
In the figure, 1, a liquid storage bag; 2. a flexible infusion tube; 3. an infusion pump motor; 4. the extrusion block, 5, a hose fitting piece; 6. a controller; 7. a flexible pressure sensor; 8. a finger electrode; 9. a pressure sensitive membrane; 10. and a tail electrode.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example (b):
as shown in fig. 1, the present invention discloses a liquid transport apparatus, comprising: the device comprises a liquid storage bag 1, an infusion hose 2, an infusion pump motor 3, an extrusion block 4, a hose fitting piece 5, a flexible pressure sensor and a controller 6; the infusion hose 2 is connected with the liquid storage bag 1, an extrusion block 4 is arranged on an output shaft of the infusion pump motor 3, a U-shaped groove is formed in the hose fitting piece 5 and used for being matched with the infusion hose 2, and a flexible pressure sensor 7 attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose 2; the controller 6 and the flexible pressure sensor 7 are connected with the infusion pump motor 3.
The flexible film pressure sensor is used for measuring the pressure signal when the infusion pipeline is blocked, so that the flexible film pressure sensor is small in size and can be directly stuck on the outer wall of the infusion pipeline, and the direct measurement of the radial pressure of the liquid pipeline is realized.
In this embodiment, the infusion pump motor 3 operates on the principle that the controller 6 (single chip microcomputer) is used to control the rotation speed of the motor, so as to drive the extrusion block 4 connected with the crankshaft of the motor to move up and down to form the extrusion action on the infusion hose 2, so that the liquid is pumped out from the liquid storage bag 1 and flows to the external interface after passing through the infusion hose 2.
In this embodiment, the end of the infusion hose 2 is connected to the external interface, and the hose fitting 5 is arranged before the external interface and after the squeezing block 4.
In this embodiment, the flexible pressure sensor 7 is thin and the infusion hose 2 has elasticity, so that the solution of the present invention can be implemented well regardless of the thickness of the flexible pressure sensor 7. In order to make the U-shaped groove fit the infusion hose 2 better, the thickness of the flexible pressure sensor 7 should be taken into account when designing the U-shaped groove. The U-shaped groove is matched with the infusion hose 2, so that the sensor and the hose are fixed, and the sensor is tightly attached to the hose.
Referring to fig. 2, the invention designs a fitting piece with a U-shaped groove which can be embedded into a pipeline, and limits and fixes the liquid pipeline, so as to avoid the influence of the installation error of the pipeline on the blockage judgment. The flexible film pressure sensor is paved at the bottom of the fitting piece, so that the contact area between the pipeline and the sensor is ensured, and the measurement of the blocking state of the elastic pipeline is realized.
Preferably, the width of the U-shaped groove is twice the sum of the radius of the infusion hose 2 and the thickness of the flexible pressure sensor 7, and the radius of the circular arc part of the U-shaped groove is the sum of the radius of the infusion hose 2 and the thickness of the flexible pressure sensor 7. Furthermore, the depth of the U-shaped groove can be equal to the diameter of the transfusion hose 2 or larger than the diameter of the transfusion hose 2. The U-shaped groove comprises a rectangular section and an arc section, the width of the rectangular section is the same as the diameter of the arc section, and the depth of the U-shaped groove is the sum of the length of the rectangular section and the radius of the arc section.
In this embodiment, the liquid is pumped out by the pressing block 4 and flows through the infusion hose 2, and the infusion hose 2 is pressed by the internal liquid pressure to be expanded and deformed to some extent, and is deformed to a smaller extent when not being externally blocked, and is deformed to a larger extent when being externally blocked, so that the pressure generated by the pressure sensor installed on the outside is increased.
In this embodiment, the flexible pressure transmissionThe sensor 7 is used for converting pressure signals into voltage signals, and is preferably a microstructure type piezoresistive sensor with the area of 16-100 mm2The thickness is 0.2-1 mm, and the linear response interval is 0-400 kPa. Among them, a sensor having an area of 7mm x 9mm, a thickness of 0.5mm, and a linear response interval of 0 to 100kPa is preferable.
Referring to fig. 3, in the present embodiment, the flexible pressure sensor 7 includes: the finger inserting device comprises a finger inserting electrode 8, a pressure sensitive film 9 and a tail electrode 10, wherein the tail electrode 10 is arranged on two sides of the finger inserting electrode 8, the tail electrode 10 is used for being connected with the controller 6, and the tail electrode 10 and the finger inserting electrode 8 are arranged on the pressure sensitive film 9; the insertion fingers of the insertion finger electrodes 8 are perpendicular to the flowing direction of the liquid in the transfusion hose 2. The piezoresistive sensor with the microstructure is characterized in that the microstructure protrusion is arranged on one side of the value pressure sensitive film 9, which is connected with the electrode, so that the sensor can sense pressure change more sensitively.
In this embodiment, both sides of the hose fitting 5 are provided with grooves for engaging the motor at the rear of the flexible pressure sensor 7.
In this embodiment, the controller 6 may be a single chip, a chip, or other devices, and may implement data processing and instruction editing and sending. The controller 6 is used for acquiring pressure data of the infusion hose 2 through the hose fitting 5 and the flexible pressure sensor 7, filtering the pressure data to obtain a pressure change curve without direct current, judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude of the current pressure period exceeds a preset first threshold value according to the pressure change curve, and performing blocking alarm if the signal amplitude ratio exceeds the first threshold value. The first pressure fluctuation amplitude is a pressure fluctuation amplitude value of one unplugged pressure cycle or an average of pressure fluctuation amplitude values of a plurality of unplugged pressure cycles. Since the system can be determined to be in an unplugged state at system start-up, the pressure fluctuation amplitude value for the first pressure cycle after system start-up can be selected.
In the present embodiment, the pressure cycle may be set on the pressure variation curve according to the duty cycle of the squeeze block 4 (infusion pump motor 3).
In this embodiment, since the pressure data includes a direct current amount, the direct current amount needs to be removed by a filter to reflect the pressure change caused by the squeezing operation, and the parameter range of the filter is usually set according to the operating frequency of the squeezing block 4. In the embodiment, a single chip microcomputer is adopted to realize program processing of a digital filter, an Infinite Impulse Response (IIR) type band-pass filter with the working frequency of 0.2-5 Hz is designed, and a pressure change curve without direct current quantity is obtained after an acquired voltage value passes through the IIR digital filter. And a filter is designed according to the working frequency of the pump, so that noise interference is removed, and the accuracy of data can be improved.
In the present embodiment, the difference between the maximum value and the minimum value of the pressure change is counted as the pressure fluctuation amplitude at fixed time intervals by the internal program of the controller 6 (single chip microcomputer). The fixed time interval should be greater than or equal to the duty cycle of the expression nubs 4.
In the on state and with the line not blocked, a set of first pressure fluctuation amplitudes V0 is recorded. And then circularly calculating the pressure fluctuation amplitude, comparing the current pressure fluctuation amplitude V1 with the first pressure fluctuation amplitude V0, obtaining a signal amplitude ratio in dB according to a formula d of 20log (V1/V0), and judging that the blockage phenomenon occurs when the signal amplitude ratio exceeds a set threshold value.
Then the single chip generates an alarm signal, outputs an alarm sound and displays the judgment result on a screen. Through multiple times of experimental determination, the signal amplitude ratio interval under the condition that the system is blocked is 10-15 dB, and the first threshold value is set to be less than or equal to 10 dB. The skilled person can perform experimental detection on the self-implemented liquid delivery device according to the technical solution of the present invention to obtain the corresponding signal amplitude ratio and the set value of the first threshold. In the present embodiment, setting the first threshold to 7dB makes it possible to effectively judge the occurrence of the clogging state.
In this embodiment, a further preferred technical solution is that, if the time exceeding the first threshold exceeds the first time, a blocking alarm is performed. In the practical application process, in order to prevent misjudgment caused by single abnormal data, the delay time for giving an alarm can be increased, for example, when the pressure change of the infusion tube sensed by the flexible sensor exceeds a threshold value, the infusion tube is marked to be possibly blocked, and if the numerical value is still greater than the threshold value after the blockage state lasts for 3-5 seconds, the occurrence of the blockage state is confirmed.
In the prior art, a blocking judgment method for calculating the change of a blocking state relative to a normal state by using a difference value method exists. However, in the prior art, a fixed value is generally adopted for processing of the initial value (judgment threshold). For a device for monitoring the pressure of a transfusion pipeline in real time by adopting a pressure sensor, the problem of setting and selecting a blockage threshold can be solved, and if the preset pressure value is too high, the pressure range cannot reach the preset value when blockage occurs, so that an alarm cannot be generated. If the preset value is set to be too low, sudden change pressure can be generated due to reasons of shaking of a pipeline, position movement of an infusion apparatus and the like in the normal use process, and the blockage alarm is judged by mistake. Moreover, for pipelines made of different materials, the blocked alarm pressure values are different, so that the risk of false alarm exists by a method of detecting the difference value between the pressure value and the preset value. Therefore, in the prior art, the data processing and judging method and accuracy of the blocking alarm still need to be improved. The invention judges according to the signal amplitude ratio of the pressure fluctuation amplitude when the blockage is judged and the pressure fluctuation amplitude of the current pressure period, not only can match the working period of the infusion pump motor 3, but also overcomes the problem that the judgment threshold value is easy to be improperly set in the prior art.
Example 2:
referring to fig. 4 and 5, the invention also discloses a blockage detection method of the infusion pipeline, comprising the following steps:
step S1, acquiring pressure data of the infusion hose 2 through a hose fitting piece 5 and a flexible pressure sensor 7, wherein the hose fitting piece 5 is provided with a U-shaped groove, the U-shaped groove is used for being matched with the infusion hose 2, and the flexible pressure sensor 7 attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose 2;
step S2, filtering the pressure data to obtain a pressure change curve without direct current quantity;
and step S3, judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude of the current pressure period exceeds a preset first threshold value according to the pressure change curve, and performing a blockage alarm if the signal amplitude ratio exceeds the first threshold value.
In this embodiment, the detection method further includes: the first pressure fluctuation amplitude is a pressure fluctuation amplitude value of one unplugged pressure cycle or an average of pressure fluctuation amplitude values of a plurality of unplugged pressure cycles. Since the system can be determined to be in an unplugged state at system start-up, the pressure fluctuation amplitude value for the first pressure cycle after system start-up can be selected.
In the present embodiment, the width of the U-shaped groove is twice the sum of the radius of the infusion hose 2 and the thickness of the flexible pressure sensor 7, and the radius of the circular arc portion of the U-shaped groove is the sum of the radius of the infusion hose 2 and the thickness of the flexible pressure sensor 7.
In this embodiment, the flexible pressure sensor 7 includes: the finger inserting device comprises a finger inserting electrode 8, a pressure sensitive film 9 and a tail electrode 10, wherein the tail electrode 10 is arranged on two sides of the finger inserting electrode 8, the tail electrode 10 is used for being connected with the controller 6, and the tail electrode 10 and the finger inserting electrode 8 are arranged on the pressure sensitive film 9; the insertion fingers of the insertion finger electrodes 8 are perpendicular to the flowing direction of the liquid in the transfusion hose 2.
In the embodiment, the flexible pressure sensor 7 is used for converting a pressure signal into a voltage signal, and is preferably a microstructure type piezoresistive sensor, the area of the sensor is 16-100 mm2, the thickness of the sensor is 0.2-1 mm, and the linear response interval of the sensor is 0-400 kPa. Among them, a sensor having an area of 7mm x 9mm, a thickness of 0.5mm, and a linear response interval of 0 to 100kPa is preferable.
In this embodiment, both sides of the hose fitting 5 are provided with grooves for engaging the motor at the rear of the flexible pressure sensor 7.
In the present embodiment, the pressure cycle may be set on the pressure variation curve according to the duty cycle of the squeeze block 4 (infusion pump motor 3).
In this embodiment, since the pressure data includes a direct current amount, the direct current amount needs to be removed by a filter to reflect the pressure change caused by the squeezing operation, and the parameter range of the filter is usually set according to the operating frequency of the squeezing block 4. In the embodiment, a single chip microcomputer is adopted to realize program processing of a digital filter, an Infinite Impulse Response (IIR) type band-pass filter with the working frequency of 0.2-5 Hz is designed, and a pressure change curve without direct current quantity is obtained after an acquired voltage value passes through the IIR digital filter. And a filter is designed according to the working frequency of the pump, so that noise interference is removed, and the accuracy of data can be improved.
In the present embodiment, the difference between the maximum value and the minimum value of the pressure change is counted as the pressure fluctuation amplitude at fixed time intervals by the internal program of the controller 6 (single chip microcomputer). The fixed time interval should be greater than or equal to the duty cycle of the expression nubs 4.
In the on state and with the line not blocked, a set of first pressure fluctuation amplitudes V0 is recorded. And then circularly calculating the pressure fluctuation amplitude, comparing the current pressure fluctuation amplitude V1 with the first pressure fluctuation amplitude V0, obtaining a signal amplitude ratio in dB according to a formula d of 20log (V1/V0), and judging that the blockage phenomenon occurs when the signal amplitude ratio exceeds a set threshold value.
Then the single chip generates an alarm signal, outputs an alarm sound and displays the judgment result on a screen. Through multiple times of experimental determination, the signal amplitude ratio interval under the condition that the system is blocked is 10-15 dB, and the first threshold value is set to be less than or equal to 10 dB. The skilled person can perform an experimental test on the self-implemented liquid delivery device according to the technical solution of the present invention to obtain the corresponding signal amplitude ratio and the set value of the first threshold. In the present embodiment, setting the first threshold to 7dB makes it possible to effectively judge the occurrence of the clogging state.
In this embodiment, a further preferable technical solution is that the blocking alarm is performed if the time exceeding the first threshold exceeds the first time. In the practical application process, in order to prevent misjudgment caused by single abnormal data, the delay time for sending out an alarm can be prolonged, for example, when the pressure change of the infusion tube sensed by the flexible sensor exceeds a threshold value, the infusion tube is marked to be possibly blocked, and if the value is still greater than the threshold value after the blockage state lasts for 3-5 seconds, the occurrence of the blockage state is confirmed.
The person skilled in the art can combine the liquid transport device of example 1 when carrying out the detection method of example 2. Therefore, those skilled in the art can understand that the description of the liquid delivery device in embodiment 1 can also be used to describe the detection method in embodiment 2, and therefore some repeated descriptions and limitations are not repeated.
Example 3:
referring to fig. 6, the invention also discloses a blockage detection device of the infusion pipeline, comprising: a first obtaining module 101, a first processing module 102 and a second processing module 103;
the first acquisition module is used for acquiring pressure data of the infusion hose 2 through a hose fitting piece 5 and a flexible pressure sensor 7, the hose fitting piece 5 is provided with a U-shaped groove, the U-shaped groove is used for fitting the infusion hose 2, and the flexible pressure sensor 7 attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose 2;
the first processing module is used for filtering the pressure data to obtain a pressure change curve without direct current quantity;
and the second processing module is used for judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude in the current pressure period exceeds a preset first threshold value or not according to the pressure change curve, and performing blocking alarm if the signal amplitude ratio exceeds the first threshold value.
In this embodiment, the detection apparatus further includes: an infusion pump motor 3 control module;
when the second processing module gives an occlusion alarm, the infusion pump motor 3 control module controls the infusion pump motor 3 to stop working.
The embodiment 3 is written based on the embodiment 2, and a person skilled in the art can execute a corresponding detection method on a controller 6 with an information receiving and processing function, such as a single chip microcomputer, according to the technical scheme disclosed by the present invention.
The technical solution of embodiment 3 may have the same or corresponding descriptions and limitations according to the detection method of embodiment 2, and is not described herein again.
Example 4:
referring to fig. 7, the present invention also discloses a blockage detection circuit for a transfusion pipeline, comprising: the pressure-dividing type pressure-measuring instrument comprises a voltage-dividing resistor, a flexible pressure sensor 7, a voltage following circuit, a motor and a controller 6, wherein an ADC (analog to digital converter) module, a timer module and a motor driving module are arranged in the controller 6;
the first end of the divider resistor is connected with the first end of the flexible pressure sensor 7, the second end of the flexible pressure sensor 7 is connected with the first end of the voltage follower circuit, the second end of the voltage follower circuit is connected with the first end of the ADC module, and the second end of the ADC module is connected with the timer module; the motor is connected with the motor driving module;
the flexible pressure sensor 7 is attached in a U-shaped groove of a fitting piece for fitting the infusion hose 2;
the controller 6 is used for acquiring pressure data of the infusion hose 2 through the hose fitting piece 5 and the flexible pressure sensor 7, and filtering the pressure data to obtain a pressure change curve without direct current; and judging whether the signal amplitude ratio of the current pressure fluctuation amplitude of the current pressure period to the first pressure fluctuation amplitude exceeds a preset first threshold value or not according to the pressure change curve, and performing blockage warning if the signal amplitude ratio exceeds the first threshold value.
In this embodiment, the flexible sensor is connected to the circuit in series with the voltage dividing resistor, and the single chip module is configured to acquire a voltage signal (pressure data) of the flexible pressure sensor 7, and the voltage signal is firstly processed by a peripheral sensor signal acquisition circuit, which is usually designed as an amplifier voltage follower circuit, and then by an analog-to-digital converter module inside the single chip. The single chip microcomputer is internally provided with a timer device, the voltage of the sensor is collected according to a fixed time interval, and the voltage signal is converted by an ADC module in the single chip microcomputer to obtain a 12-bit voltage value.
In this implementation, the detection circuit further includes a display module. The display module includes: the LCD display and IIC module, IIC module sets up in controller 6, and IIC module and LCD display are connected. The display module is mainly a display screen with a digital display function, usually an LCD display, the singlechip sends data through an I2C interface, and information such as a blockage judgment result, an alarm prompt and the like is displayed through the display module.
On the basis of embodiment 1 or embodiment 2, a person skilled in the art can set a corresponding control circuit according to the detection method or the delivery device to realize the function of liquid delivery detection.
To sum up, the embodiment of the present invention provides a liquid delivery device, a method, a device and a circuit for detecting blockage of an infusion pipeline, and compared with the prior art, the beneficial effects are that:
(1) the flexible film pressure sensor is used for measuring the pressure signal when the infusion pipeline is blocked, so that the flexible film pressure sensor is small in size, can be directly adhered to the outer wall of the infusion pipeline, and realizes direct measurement of the radial pressure of the liquid pipeline.
(2) According to the invention, the fitting piece with the U-shaped groove capable of being embedded into the pipeline is designed to limit and fix the liquid pipeline, so that the influence of the installation error of the pipeline on the blockage judgment is avoided.
(3) The flexible film pressure sensor is paved at the bottom of the fitting piece, so that the contact area between the pipeline and the sensor is ensured, and the measurement of the blocking state of the elastic pipeline is realized.
(4) Since the flexible pressure sensor 7 has a piezoresistive strain curve, the resistance value is reduced along with the pressure change, the pipeline pressure value can be obtained by utilizing the linear range of the piezoresistive curve of the sensor, and the pressure value in the measured pipeline path direction can be obtained by designing a circuit matched with the sensor. And then, the radial pressure jitter amplitude of the pipeline is calculated in real time through a software processing algorithm, so that a blocking signal can be judged.
(5) And a filter is designed according to the working frequency of the pump, so that noise interference is removed, and the accuracy of data can be improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A liquid delivery device, comprising: the device comprises a liquid storage bag, a transfusion hose, a transfusion pump motor, an extrusion block, a hose fitting piece, a flexible pressure sensor and a controller; the infusion hose is connected with the liquid storage bag, an extrusion block is arranged on an output shaft of the infusion pump motor, a U-shaped groove is formed in the hose fitting piece and used for fitting the infusion hose, and a flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose; the controller is connected with the flexible pressure sensor and the infusion pump motor.
2. The liquid conveying device as claimed in claim 1, wherein the width of the U-shaped groove is twice the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor, and the radius of the circular arc portion of the U-shaped groove is the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor.
3. The liquid delivery device of claim 1, wherein the flexible pressure sensor comprises: the device comprises a finger inserting electrode, a pressure sensitive film and a tail electrode, wherein the tail electrode is arranged on two sides of the finger inserting electrode and is used for being connected with a controller, and the tail electrode and the finger inserting electrode are arranged on the pressure sensitive film; the insertion fingers of the insertion finger electrodes are perpendicular to the flowing direction of liquid in the infusion hose.
4. The liquid conveying device according to claim 1, wherein the controller is configured to obtain pressure data of the infusion hose through the hose fitting and the flexible pressure sensor, filter the pressure data to obtain a pressure variation curve without direct current, determine whether a signal amplitude ratio of a current pressure fluctuation amplitude and a first pressure fluctuation amplitude of a current pressure cycle exceeds a preset first threshold according to the pressure variation curve, and perform a blockage alarm if the signal amplitude ratio exceeds the first threshold.
5. A blockage detection method of an infusion pipeline is characterized by comprising the following steps:
acquiring pressure data of the infusion hose through a hose fitting piece and a flexible pressure sensor, wherein the hose fitting piece is provided with a U-shaped groove, the U-shaped groove is used for fitting the infusion hose, and the flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose;
filtering the pressure data to obtain a pressure change curve without direct current quantity;
and judging whether the signal amplitude ratio of the current pressure fluctuation amplitude of the current pressure period to the first pressure fluctuation amplitude exceeds a preset first threshold value or not according to the pressure change curve, and performing blockage warning if the signal amplitude ratio exceeds the first threshold value.
6. The method of claim 5, wherein the width of the U-shaped groove is twice the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor, and the radius of the arc portion of the U-shaped groove is the sum of the radius of the infusion hose and the thickness of the flexible pressure sensor.
7. The method of claim 5, wherein the flexible pressure sensor comprises: the finger inserting device comprises finger inserting electrodes, a pressure sensitive film and tail electrodes, wherein the tail electrodes are arranged on two sides of the finger inserting electrodes and are used for being connected with a controller, and the tail electrodes and the finger inserting electrodes are arranged on the pressure sensitive film; the insertion fingers of the insertion finger electrodes are perpendicular to the flowing direction of liquid in the infusion hose.
8. The utility model provides a blockage detection device of infusion pipeline which characterized in that includes: the device comprises a first acquisition module, a first processing module and a second processing module;
the first acquisition module is used for acquiring pressure data of the infusion hose through a hose fitting piece and a flexible pressure sensor, the hose fitting piece is provided with a U-shaped groove, the U-shaped groove is used for being matched with the infusion hose, and the flexible pressure sensor attached to the U-shaped groove is arranged between the U-shaped groove and the infusion hose;
the first processing module is used for filtering the pressure data to obtain a pressure change curve without direct current quantity;
and the second processing module is used for judging whether the signal amplitude ratio of the current pressure fluctuation amplitude and the first pressure fluctuation amplitude in the current pressure period exceeds a preset first threshold value or not according to the pressure change curve, and performing blocking alarm if the signal amplitude ratio exceeds the first threshold value.
9. The occlusion detection device of claim 8, wherein the detection device further comprises: an infusion pump motor control module;
and when the second processing module gives an alarm of blockage, the infusion pump motor control module controls the infusion pump motor to stop working.
10. A blockage detection circuit of an infusion pipeline is characterized by comprising: the pressure sensor comprises a divider resistor, a flexible pressure sensor, a voltage following circuit, a motor and a controller, wherein an ADC (analog to digital converter) module, a timer module and a motor driving module are arranged in the controller;
the first end of the divider resistor is connected with the first end of the flexible pressure sensor, the second end of the flexible pressure sensor is connected with the first end of the voltage follower circuit, the second end of the voltage follower circuit is connected with the first end of the ADC module, and the second end of the ADC module is connected with the timer module; the motor is connected with the motor driving module;
the flexible pressure sensor is attached in a U-shaped groove of a fitting piece for fitting the infusion hose;
the controller is used for acquiring pressure data of the infusion hose through the hose fitting piece and the flexible pressure sensor, and filtering the pressure data to obtain a pressure change curve without direct current quantity; and judging whether the signal amplitude ratio of the current pressure fluctuation amplitude of the current pressure period to the first pressure fluctuation amplitude exceeds a preset first threshold value or not according to the pressure change curve, and performing blockage warning if the signal amplitude ratio exceeds the first threshold value.
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