Device and method for monitoring blockage of liquid flow driven by peristaltic pump

Abstract

The invention relates to a device and a method for monitoring liquid flow blockage driven by a peristaltic pump. The problem that in the prior art, ablation needle fluid blockage detection lags behind and is not accurate enough is solved. The device comprises a water removal pipe and a water return pipe, peristaltic pumps are arranged on the water removal pipe and the water return pipe, one end of the water removal pipe and one end of the water return pipe are connected with a normal saline container, the other end is connected with an ablation needle, and sensor matrixes are arranged on the water removal pipe and the water return pipe, connected with a control assembly and used for pulse signal transmission. The method has the advantages of being good in detection accuracy, good in real-time performance, quicker and safer in blocking judgment and good in use effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical detection tools, and in particular to a device and method for monitoring liquid flow blockage driven by a peristaltic pump. Background Art

[0002] In microwave ablation equipment, flowing saline is used for cooling, and the power to drive the flow is a peristaltic pump. In actual use, due to various factors, the infusion line will be compressed, twisted, bent, etc., resulting in blockage during the infusion process. Once the liquid medicine cannot be output, it may cause adverse consequences, so it is necessary to promptly detect the blockage of the system and issue an alarm. The existing technology for detecting the blockage pressure of the infusion pump usually detects some indirect physical quantities related to the blockage state, such as motor current, push rod displacement, piston friction and other physical quantities to infer the blockage state. However, these detection methods through indirect physical quantities cannot detect the blockage of the infusion line in a timely and accurate manner; in addition, the internal liquid flow cavity of the existing ablation needle is small and the flow rate is small, and it is difficult for conventional flow sensors to accurately detect the flow. Although the liquid flow state can be indirectly judged by a temperature sensor, the judgment time is delayed and not accurate enough.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a liquid delivery device, an infusion line blockage detection method, device and circuit [CN202210190870.4], which includes a liquid storage bag, an infusion hose, an infusion pump motor, an extrusion block, a hose fitting, a flexible pressure sensor and a controller; the infusion hose is connected to the liquid storage bag, the output shaft of the infusion pump motor is provided with an extrusion block, the hose fitting is provided with a U-shaped groove, the U-shaped groove is used to match the infusion hose, and a flexible pressure sensor that fits the U-shaped groove is provided between the U-shaped groove and the infusion hose; the controller and the flexible pressure sensor are connected to the infusion pump motor.

[0004] The above scheme has solved to a certain extent the problem that the infusion pump blockage pressure room detection method in the prior art is difficult to accurately detect fluid blockage, but the scheme still has many shortcomings, for example: the internal liquid flow cavity of the ablation needle is small and the flow rate is small, and conventional flow sensors are difficult to accurately detect the flow. Although the liquid flow state can be indirectly judged by a temperature sensor, the judgment time is delayed and not accurate enough. Summary of the invention

[0005] The object of the present invention is to provide a device and method for monitoring flow blockage driven by a peristaltic pump in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a device for monitoring liquid flow blockage driven by a peristaltic pump, comprising a drain pipe and a return pipe, the drain pipe and the return pipe are provided with a peristaltic pump, and one end of the drain pipe and the return pipe are connected to a physiological saline container and the other end is connected to an ablation needle, and a sensor matrix is ​​provided on the drain pipe and the return pipe, and the sensor matrix is ​​connected to a control component and transmits a pulsating signal.

[0007] In the above-mentioned device for monitoring liquid flow blockage driven by a peristaltic pump, a liquid inlet and a liquid outlet are respectively provided on the ablation needle, the liquid inlet is connected to one end of the drain pipe, the liquid outlet is connected to one end of the return pipe, and the physiological saline container is connected to the atmosphere.

[0008] In the above-mentioned device for monitoring the blockage of liquid flow driven by a peristaltic pump, the sensor matrix includes a hard pipe arranged in the outermost layer, a deformable hose is provided on the inner side of the hard pipe in the circumferential direction, and the deformable hose and the two ends of the hard pipe are sealed, and a plurality of annular sensor groups arranged in a ring shape along the circumferential outer wall of the deformable hose are provided between the deformable hose and the hard pipe, and the annular sensor group is composed of a plurality of equidistantly arranged sensors, and the annular sensor groups are arranged in sequence inside the entire hard pipe to form a sensor matrix.

[0009] In the above-mentioned device for monitoring liquid flow blockage driven by a peristaltic pump, the control component includes an analog signal fusion circuit, one end of the analog signal fusion circuit is connected to the sensor and the other end is connected to the low-pass filter through an amplification circuit, the low-pass filter is connected to an analog-to-digital converter ADC, and the analog-to-digital converter ADC is connected to a multiplexer MUX, the multiplexer MUX is respectively connected to a reference template and an MCU module, and the MCU module is respectively connected to a display screen, an information indicator light, a peristaltic pump and a loudspeaker.

[0010] According to the above-mentioned device for monitoring the blockage of liquid flow driven by the peristaltic pump 3, a method for monitoring the blockage of liquid flow driven by the peristaltic pump 3 is provided, and the method comprises the following steps:

[0011] S1, peristaltic pump drives liquid flow;

[0012] S2, force changes detected by the sensor matrix;

[0013] S3, the sensor matrix sends a pulsating signal to the control component;

[0014] S4, the control component makes a blocking judgment based on the received pulse signal;

[0015] S5. The control component performs an operation according to the judgment result.

[0016] In step S1, the peristaltic pump drives the liquid in the water intake pipe and the water return pipe to flow synchronously. When the liquid is blocked, the continuous driving force of the peristaltic pump increases the pressure in the water intake pipe and the water return pipe, and the pulsation intensifies.

[0017] In step S2, when liquid blockage causes deformation of the return pipe or the drain pipe, the sensor matrix generates a pulsation signal, wherein the superposition of the pulsation signals of the sensors generates a pulsation signal with greater intensity.

[0018] In step S4, the sensor matrix generates signal phase differences and intensities according to the different times when each position of the return pipe and the drainage pipe is disturbed by the liquid flow. The control component records the direction, pressure and speed of the liquid flow at each position of the current return pipe and the drainage pipe by continuously acquiring the phase difference and intensity of the pulsating signal in different time periods, and determines the blockage location based on the recorded data.

[0019] In step S4, when making a blockage judgment, the control component compares the pressures at the same positions of the drain pipe and the return pipe detected by the sensor. If the pressure at the current position of the return pipe is lower than the pressure at the same position of the drain pipe, it is judged to be blocked; if the pressure at the current position of the return pipe is greater than or equal to the pressure at the same position of the drain pipe, it is judged to be unobstructed.

[0020] In step S5, when the MCU and the module determine that the current state is blocked, a reminder is given through the display screen, the information indicator light, and the loudspeaker, and the pump pressure of the peristaltic pump is adjusted to clear the blockage; the pulsating signal template data under the normal liquid flow state is pre-stored in the memory of the MCU module as a reference. When the blocked state is judged, the real-time collected waveform data and the pulsating signal template data under the normal liquid flow state pre-stored in the reference template are subjected to pattern matching algorithm analysis, and a minimum similarity threshold is set. When the similarity between the real-time pulsating signal and the reference template is lower than the minimum similarity threshold, it is judged as a liquid flow abnormality; if the similarity values ​​of several consecutive pulsating signal cycles are lower than the minimum similarity threshold, the MCU module determines that the liquid flow is blocked, triggers an alarm and subsequent actions.

[0021] Compared with the prior art, the advantages of the present invention are: a peristaltic pump is used to drive the flow of physiological saline, and a matrix-arranged annular sensor group is used to monitor the pressure of the deformable hose, thereby achieving the purpose of monitoring the liquid flow state, and real-time analysis of whether the liquid flow is normal is performed based on the pulsating signal of the sensor to determine whether the pipeline is blocked. The scheme is simple in design, easy to implement, and has good real-time performance. The blockage judgment is faster and safer, and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2It is a schematic diagram of the arrangement position of the annular sensor group in the present invention;

[0024] Figure 3 is a sensor distribution diagram in the present invention;

[0025] Figure 4 It is a schematic diagram of the pulsation signal in the present invention;

[0026] Figure 5 It is a pulse signal collection flow chart in the present invention;

[0027] In the figure: drain pipe 1, return pipe 2, peristaltic pump 3, saline container 4, ablation needle 5, liquid inlet 51, liquid outlet 52, sensor matrix 6, hard pipe 61, deformable hose 62, annular sensor group 63, sensor 631, control component 7, analog signal fusion circuit 71, amplifier circuit 72, low-pass filter 73, analog-to-digital converter ADC74, multiplexer MUX75, reference template 76, MCU module 77, display screen 771, information indicator light 772, and loudspeaker 773. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-5 As shown, a device for monitoring liquid flow blockage driven by a peristaltic pump includes a drain pipe 1 and a return pipe 2, a peristaltic pump 3 is arranged on the drain pipe 1 and the return pipe 2, and one end of the drain pipe 1 and the return pipe 2 is connected to a physiological saline container 4 and the other end is connected to an ablation needle 5, a sensor matrix 6 is arranged on the drain pipe 1 and the return pipe 2, and the sensor matrix 6 is connected to a control component 7 and transmits a pulsating signal.

[0030] The ablation needle 5 is provided with a liquid inlet 51 and a liquid outlet 52 , the liquid inlet 51 is connected to one end of the drain pipe 1 , the liquid outlet 52 is connected to one end of the return pipe 2 , and the physiological saline container 4 is connected to the atmosphere.

[0031] Furthermore, the sensor matrix 6 includes a hard pipe 61 arranged in the outermost layer, a deformable hose 62 is provided on the inner side of the hard pipe 61 in the circumferential direction, and the deformable hose 62 and both ends of the hard pipe 61 are sealed, and a plurality of annular sensor groups 63 arranged in a ring shape along the circumferential outer wall of the deformable hose 62 are provided between the deformable hose 62 and the hard pipe 61 in the circumferential direction, and the annular sensor group 63 is composed of a plurality of equidistantly arranged sensors 631, and the annular sensor group 63 is arranged in sequence inside the entire hard pipe 61 to form a sensor matrix 6.

[0032] The seal between the deformable hose 62 and both ends of the hard pipe 61 allows the liquid to flow only in the inner pipe, and the sensors 631 can be set as one pair or multiple pairs. The number and length of the sensors 631 can be increased according to actual needs, and multiple sensors 631 can be arranged in sequence inside the entire hard pipe 61 to form a matrix. The signal lines of all sensors 631 pass through the hard pipe 61 to collect signals.

[0033] In detail, the control component 7 includes an analog signal fusion circuit 71, one end of the analog signal fusion circuit 71 is connected to the sensor 631 and the other end is connected to the low-pass filter 73 through the amplifier circuit 72, the low-pass filter 73 is connected to the analog-to-digital converter ADC74, and the analog-to-digital converter ADC74 is connected to the multiplexer MUX75, the multiplexer MUX75 is respectively connected to the reference template 76 and the MCU module 77, and the MCU module 77 is respectively connected to the display screen 771, the information indicator light 772, the peristaltic pump 3 and the loudspeaker 773.

[0034] The analog-to-digital converter ADC74 is an electronic device or circuit that converts an analog signal, ie, a continuous voltage signal, into a digital signal, ie, a discrete binary value.

[0035] Multiplexer MUX75 is an electronic component or circuit used for signal selection, selecting signals from multiple sensors or data sources and passing the selected signals to the next step of processing.

[0036] A method for monitoring blockage of a fluid flow driven by a peristaltic pump 3, the method comprising the following steps:

[0037] S1, peristaltic pump 3 drives the liquid to flow;

[0038] S2, force changes detected by the sensor matrix 6;

[0039] S3, the sensor matrix 6 sends a pulsating signal to the control component 7;

[0040] S4, the control component 7 performs blocking judgment according to the received pulse signal;

[0041] S5. The control component 7 performs an operation according to the judgment result.

[0042] In step S1, the peristaltic pump 3 drives the liquid in the water intake pipe and the water return pipe 2 to flow synchronously. When the liquid is blocked, the continuous driving force of the peristaltic pump 3 increases the pressure in the water intake pipe 1 and the water return pipe 2, and the pulsation intensifies.

[0043] In step S2, when liquid blockage causes deformation of the return pipe 2 or the drain pipe 1, the sensor matrix 6 generates a pulsation signal, wherein the superposition of the pulsation signals of the sensors 631 generates a pulsation signal with greater intensity.

[0044] In step S4, the sensor matrix 6 has signal phase differences and intensities different according to the different times when each position of the return pipe 2 and the drainage pipe 1 is disturbed by the liquid flow. The control component 7 records the direction, pressure and speed of the liquid flow at each position of the current return pipe 2 and the drainage pipe 1 by continuously acquiring the phase difference and intensity of the pulsating signal in different time periods, and determines the blockage position based on the recorded data.

[0045] In step S4, when making a blockage judgment, the control component 7 compares the pressures at the same positions of the drain pipe 1 and the return pipe 2 detected by the comparison sensor 631. If the pressure at the current position of the return pipe 2 is lower than the pressure at the same position of the drain pipe 1, it is judged to be blocked; if the pressure at the current position of the return pipe 2 is greater than or equal to the pressure at the same position of the drain pipe 1, it is judged to be unobstructed.

[0046] In step S5, when the MCU module determines that the current state is blocked, a reminder is given through the display screen 771, the information indicator light 772, and the loudspeaker 773, and the pump pressure of the peristaltic pump 3 is adjusted to clear the blockage; the pulsating signal template data under the normal liquid flow state is pre-stored in the memory of the MCU module 77 as a reference. When the blocked state is judged, the real-time collected waveform data and the pulsating signal template data under the normal liquid flow state pre-stored in the reference template are subjected to pattern matching algorithm analysis, such as cross-correlation analysis or dynamic time warping algorithm DTW, and a minimum similarity threshold is set. When the similarity between the real-time pulsating signal and the reference template is lower than the minimum similarity threshold, it is judged as a liquid flow abnormality; if the similarity values ​​of several consecutive pulsating signal cycles are lower than the minimum similarity threshold, the MCU module 77 determines that the liquid flow is blocked, triggers an alarm and subsequent actions.

[0047] To sum up, the principle of this embodiment is: the peristaltic pump 3 is used to drive the physiological saline solution to flow along the drainage pipe 1 toward the ablation needle 5, and the deformation pressure of the deformable hose 62 is monitored by the annular sensor group 63 arranged in a matrix, so as to realize the detection of the liquid flow state. The sensor 631 detects the pulsation signal of the deformable hose 62 and sends it to the control component 7 for signal processing and comparison with the pulsation signal of the deformable hose 62 at the same position of the return pipe 2. At the same time, the pulsation signal template data under the normal liquid flow state is preset as a benchmark, and a minimum similarity threshold is set for two-way comparison, so as to determine whether the drainage pipe is blocked.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0049] Although this article uses more terms such as drain pipe 1, return pipe 2, peristaltic pump 3, saline container 4, ablation needle 5, liquid inlet 51, liquid outlet 52, sensor matrix 6, hard pipe 61, deformable hose 62, annular sensor group 63, sensor 631, control component 7, analog signal fusion circuit 71, amplifier circuit 72, low-pass filter 73, analog-to-digital converter ADC74, multiplexer MUX75, reference template 76, MCU module 77, display screen 771, information indicator light 772, loudspeaker 773, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A device for monitoring flow blockage driven by a peristaltic pump, comprising a drain pipe (1) and a return pipe (2), wherein the drain pipe (1) and the return pipe (2) are provided with a peristaltic pump (3), and the drain pipe (1) and the return pipe (2) are connected to a physiological saline container (4) at one end and to an ablation needle (5) at the other end, characterized in that: The water discharge pipe (1) and the water return pipe (2) are both provided with a sensor matrix (6), and the sensor matrix (6) is connected to a control component (7) and performs pulsation signal transmission.

2. A device for monitoring flow blockage driven by a peristaltic pump according to claim 1, characterized in that: The ablation needle (5) is provided with a liquid inlet (51) and a liquid outlet (52), respectively; the liquid inlet (51) is connected to one end of the drainage pipe (1), the liquid outlet (52) is connected to one end of the return pipe (2), and the physiological saline container (4) is connected to the atmosphere.

3. A device for monitoring flow blockage driven by a peristaltic pump according to claim 1, characterized in that: The sensor matrix (6) comprises a hard pipe (61) arranged at the outermost layer, a deformable hose (62) is arranged on the inner side of the hard pipe (61) in the circumferential direction, and the deformable hose (62) and the hard pipe (61) are sealed at both ends, and a plurality of annular sensor groups (63) arranged in an annular shape along the circumferential outer wall of the deformable hose (62) are arranged between the deformable hose (62) and the hard pipe (61) in the circumferential direction, and the annular sensor group (63) is composed of a plurality of sensors (631) arranged at equal distances, and the annular sensor groups (63) are sequentially arranged inside the entire hard pipe (61) to form a sensor matrix (6).

4. A device for monitoring flow blockage driven by a peristaltic pump according to claim 1, characterized in that: The control component (7) comprises an analog signal fusion circuit (71), one end of the analog signal fusion circuit (71) is connected to the sensor (631) and the other end is connected to the low-pass filter (73) through the amplifier circuit (72), the low-pass filter (73) is connected to an analog-to-digital converter ADC (74), and the analog-to-digital converter ADC (74) is connected to a multiplexer MUX (75), the multiplexer MUX (75) is respectively connected to a reference template (76) and an MCU module (77), and the MCU module (77) is respectively connected to a display screen (771), an information indicator light (772), a peristaltic pump (3) and a loudspeaker (773).

5. A method for monitoring flow blockage driven by a peristaltic pump (3) according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1, peristaltic pump (3) drives liquid flow; S2, force changes detected by the sensor matrix (6); S3, the sensor matrix (6) sends a pulsating signal to the control component (7); S4, the control component (7) performs blocking judgment according to the received pulse signal; S5. The control component (7) performs an operation according to the judgment result.

6. A method for monitoring blockage of a fluid flow driven by a peristaltic pump (3) according to claim 5, characterized in that: In step S1, the peristaltic pump (3) drives the liquid in the water intake pipe and the water return pipe (2) to flow synchronously. When the liquid is blocked, the continuous driving force of the peristaltic pump (3) increases the pressure in the water intake pipe (1) and the water return pipe (2), and the pulsation intensifies.

7. A method for monitoring flow blockage driven by a peristaltic pump (3) according to claim 6, characterized in that: In step S2, when liquid blockage causes the return pipe (2) or the drain pipe (1) to deform, the sensor matrix (6) generates a pulsation signal, wherein the superposition of the pulsation signals of the sensors (631) generates a pulsation signal with greater intensity.

8. A method for monitoring blockage of a fluid flow driven by a peristaltic pump (3) according to claim 7, characterized in that: In step S4, the sensor matrix (6) generates signal phase differences and intensities according to the different times when each position of the return pipe (2) and the drainage pipe (1) is disturbed by the liquid flow. The control component (7) records the direction, pressure and speed of the liquid flow at each position of the current return pipe (2) and the drainage pipe (1) by continuously acquiring the phase difference and intensity of the pulsating signal in different time periods, and determines the blockage position based on the recorded data.

9. A method for monitoring blockage of a fluid flow driven by a peristaltic pump (3) according to claim 8, characterized in that: In step S4, when making a blockage judgment, the control component (7) compares the pressures at the same positions of the drain pipe (1) and the return pipe (2) detected by the comparison sensor (631). If the pressure at the current position of the return pipe (2) is less than the pressure at the same position of the drain pipe (1), it is judged to be blocked; if the pressure at the current position of the return pipe (2) is greater than or equal to the pressure at the same position of the drain pipe (1), it is judged to be unobstructed.

10. A method for monitoring flow blockage driven by a peristaltic pump (3) according to claim 1, characterized in that: In step S5, when the MCU module determines that the current state is blocked, a reminder is given through the display screen (771), the information indicator light (772), and the loudspeaker (773), and the pump pressure of the peristaltic pump (3) is adjusted to clear the blockage; the pulsating signal template data under the normal liquid flow state is pre-stored in the memory of the MCU module (77) as a reference. When the blocked state is determined, the real-time collected waveform data and the pulsating signal template data under the normal liquid flow state pre-stored in the reference template are subjected to pattern matching algorithm analysis, and a minimum similarity threshold is set. When the similarity between the real-time pulsating signal and the reference template is lower than the minimum similarity threshold, it is determined that the liquid flow is abnormal; if the similarity values ​​of several consecutive pulsating signal cycles are all lower than the minimum similarity threshold, the MCU module (77) determines that the liquid flow is blocked, triggers an alarm and subsequent actions.

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