A self-feedback needle cleaning pipeline and control method

Abstract

The present application relates to a self-feedback needle cleaning control method, comprising the following steps: S1: setting a pressure range value; S2: setting a pressure detection point on the needle washing pipeline connected to the sampling needle, and setting a pressure sensor at the pressure detection point to detect the liquid pressure in the needle washing pipeline; S3: transmitting the digital signal converted in the pressure sensor to the microcontroller unit through real-time communication; S4: the microcontroller unit calculates the received numerical value and compares it with the set pressure range value to determine the next action, and controls the internal timer to output a pulse of a specific proportion to the speed-regulated high-pressure diaphragm pump; S5: the speed-regulated high-pressure diaphragm pump adjusts the motor speed according to the pulse signal, thereby controlling the needle washing flow rate. The present application dynamically adjusts the motor speed of the diaphragm pump to ensure stable pressure output during the needle washing process; it can also realize abnormal alarm during needle washing; and sets a safety valve to ensure the safety of the entire fluid pipeline system to avoid joint leakage, pump and valve damage, etc.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and in particular, relates to a self-feedback needle cleaning pipeline and control method. Background Art

[0002] In the medical field, it is often necessary to test blood or body fluids, so it is necessary to sample the liquid in the reagent tube. To avoid contaminating the reagent, the non-disposable sampling needle needs to be cleaned after sampling before the next sampling to ensure that the cleaning pressure can enhance the needle washing effect and avoid contamination. At present, the instruments on the market cannot accurately control the cleaning pressure of the inner wall of the sampling needle, and often use high pressure to flush the inner wall of the sampling needle, which not only wastes cleaning fluid, but also easily causes safety accidents. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to solve the deficiencies in the prior art, thereby providing a self-feedback needle cleaning control method, aiming to achieve better cleaning effect by adjusting the cleaning pressure, saving cleaning fluid, and avoiding safety accidents caused by high pressure.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A self-feedback needle cleaning pipeline comprises a needle washing pipeline and a pressure relief pipeline, wherein the needle washing pipeline and the pressure relief pipeline are arranged in parallel, and the needle washing pipeline comprises:

[0006] Sampling needle;

[0007] A pressure sensor connected to the liquid inlet end of the sampling needle and used to detect the internal pressure of the sampling needle;

[0008] A sampling plunger pump, connected to the sampling needle, for driving the sampling needle to suck and discharge liquid;

[0009] Two normally closed electromagnetic valves are connected to the sampling plunger pump and are used to control the opening and closing of the needle washing pipeline.

[0010] The pressure relief pipeline comprises:

[0011] Safety valve, which ensures that the pressure of the needle washing pipeline is not higher than the set value during use and is used to protect the needle washing pipeline;

[0012] Two normally open solenoid valves are connected to the safety valve to control the opening and closing of the pressure relief pipeline.

[0013] A self-feedback needle cleaning pipeline also includes a speed-adjustable high-pressure diaphragm pump, which is used to pressurize the needle cleaning pipeline.

[0014] A self-feedback needle cleaning control method comprises the following steps:

[0015] S1: Set a pressure range value;

[0016] S2: a pressure detection point is set on the needle washing pipeline connected to the sampling needle, and a pressure sensor is set at the pressure detection point to detect the liquid pressure in the needle washing pipeline;

[0017] S3: transmitting the converted digital signal in the pressure sensor to the micro control unit through real-time communication;

[0018] S4: The microcontroller unit calculates the received value and compares it with the set pressure range value, determines the next action, and controls the internal timer to output a pulse of a specific proportion to the speed-regulating high-pressure diaphragm pump;

[0019] S5: The speed-regulated high-pressure diaphragm pump adjusts the motor speed according to the pulse signal to control the needle washing flow rate.

[0020] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that a pressure relief pipeline connected in parallel with the needle washing pipeline is also provided at the liquid outlet of the speed-regulating high-pressure diaphragm pump, and a safety valve is provided on the pressure relief pipeline. When the pressure of the needle washing pipeline exceeds the pressure value set by the safety valve 6, the cleaning liquid will flow out from the safety valve 6 to protect the needle washing pipeline.

[0021] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that two normally open solenoid valves are further provided on the pressure relief pipeline between the speed-regulating high-pressure diaphragm pump and the safety valve.

[0022] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that: when the pressure sensor detects that the needle washing pressure is significantly lower than the lower limit of the set pressure range value, and still cannot reach the set value after increasing the speed of the high-pressure diaphragm pump, the needle washing system is judged to be abnormal, the instrument automatically alarms, and prompts maintenance personnel to intervene.

[0023] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that: when the needle washing pressure is higher than the set upper limit of the pressure range value, the system reduces the liquid inlet of the speed-regulating high-pressure diaphragm pump but the needle washing pressure still cannot be reduced, it is determined that the sampling needle is blocked and the instrument automatically alarms.

[0024] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that: when the sampling needle is blocked, the two normally open solenoid valves close the pressure relief channel, continuously increase the speed of the speed-regulating high-pressure diaphragm pump motor, increase the pressure of the needle washing pipeline to a first pressure value, and use high water pressure to clear the sampling needle.

[0025] Preferably, a self-feedback needle cleaning control method of the present invention is characterized by: increasing the pressure in the needle washing pipeline to a first pressure value and continuously washing the needle for 5 seconds, turning off the speed-regulating high-pressure diaphragm pump, and if the pressure sensor detects that the pressure continues to drop to near 0 at this time, it is determined that the needle is unblocked successfully and the operation is continued; if the pressure is still maintained at the first pressure value, it is determined that the needle is unblocked unsuccessfully, the two normally open solenoid valves are opened, part of the liquid is released to reduce the pressure of the entire system, and an alarm is issued to prompt maintenance personnel to intervene.

[0026] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that: the comparison result between the numerical value received in S4 and the set pressure range value includes, when the needle washing pressure is lower than the lower limit of the set pressure range value, increasing the motor speed of the speed-regulating high-pressure diaphragm pump, increasing the needle washing flow rate, and increasing the needle washing pressure.

[0027] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that: the comparison result between the numerical value received in S4 and the set pressure range value also includes, when the needle washing pressure is higher than the set upper limit of the pressure range value, reducing the motor speed of the speed-regulating high-pressure diaphragm pump.

[0028] Preferably, a self-feedback needle cleaning control method of the present invention is characterized in that: the comparison result between the numerical value received in S4 and the set pressure range value also includes, when the needle washing pressure value is within the set pressure range value, maintaining the motor speed of the speed-regulating high-pressure diaphragm pump.

[0029] The beneficial effects of the present invention are:

[0030] (1) The present invention applies a pressure detection sensor installed near the needle, and a high-pressure diaphragm pump with adjustable duty cycle is selected. The pressure sensor collects the needle washing pressure in real time, converts it into a digital signal, and uploads it to the microcontroller unit in real time. The microcontroller unit dynamically adjusts the motor speed of the diaphragm pump according to the set pressure value to ensure stable pressure output during the needle washing process;

[0031] (2) It can also realize abnormal alarm during needle washing, such as no pressure output during needle washing, needle blockage alarm, and output high water pressure to clear the needle after needle blockage;

[0032] (3) The present application also provides a safety valve to ensure the safety of the entire fluid pipeline system and avoid joint leakage, pump and valve damage, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Figure 1 It is a schematic diagram of the workflow of an embodiment of the present application;

[0035] Figure 2Schematic diagram of the fluid system of an embodiment of the present application.

[0036] The reference numerals in the figure are:

[0037] Pressure sensor 1;

[0038] Sampling needle 2

[0039] Sampling plunger pump 3;

[0040] Two normally closed solenoid valves 4;

[0041] Speed-regulated high-pressure diaphragm pump 5;

[0042] Safety valve 6;

[0043] Two normally open solenoid valves 7;

[0044] Cleaning fluid storage tank 8. DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0048] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0049] Example

[0050] This embodiment provides a self-feedback needle cleaning control method. Figure 1 and Figure 2 , including the following steps:

[0051] S1: Set a pressure range value;

[0052] In this embodiment, the pressure range is set to 0.21 MPa-0.23 MPa.

[0053] S2: a pressure detection point is set on the needle washing pipeline connected to the sampling needle 2, and a pressure sensor 1 is set at the pressure detection point to detect the liquid pressure in the needle washing pipeline;

[0054] In this embodiment, the needle washing pipeline includes a sampling needle 2, a sampling plunger pump 3 and two normally closed solenoid valves 4 connected in sequence. The pressure sensor 1 is arranged between the sampling needle 2 and the sampling plunger pump 3, and close to the liquid inlet of the sampling needle 2. The two normally closed solenoid valves 4 are in a normally closed mode. When the speed-regulating high-pressure diaphragm pump 5 is working and pressurizing, the two normally closed solenoid valves 4 are in an open state.

[0055] It should be noted that the pressure sensor 1 adopts a board-mounted pressure sensor, and the pressure sensor 1 collects pressure values ​​at a set frequency, for example, once every 0.1 seconds, and collects pressure data 10 times in 1 second.

[0056] S3: transmitting the converted digital signal in the pressure sensor to the micro control unit through real-time communication;

[0057] In this embodiment, the real-time communication method uses a PC communication protocol or an SPI communication protocol to transmit the digital signal converted in the pressure sensor to the micro control unit.

[0058] S4: The microcontroller unit calculates the received value and compares it with the set pressure range value, determines the next action, and controls the internal timer to output a pulse of a specific proportion to the speed-regulating high-pressure diaphragm pump;

[0059] In this embodiment, the microcontroller unit calculates the received numerical value by averaging multiple pressure collection values ​​within a certain period of time, for example, collecting pressure data once every 0.1 seconds, collecting pressure data 10 times within 1 second, and averaging these 10 data. The average obtained is the pressure value, and this pressure value is compared with the pressure range value to determine the next action.

[0060] It should be noted that when one or two data are significantly different from other data among multiple pressure acquisition values, the data should be removed and the average value should be taken as the pressure value for comparison with the pressure range value.

[0061] S5: The speed-regulated high-pressure diaphragm pump adjusts the motor speed according to the pulse signal to control the needle washing flow rate.

[0062] Specifically, when the needle washing pressure is lower than 0.21Mpa, the motor speed of the speed-regulating high-pressure diaphragm pump is increased, the needle washing flow rate is increased, and the needle washing pressure is increased; conversely, when the needle washing pressure is higher than 0.23Mpa, the motor speed of the diaphragm pump is reduced; when the needle washing pressure value is within 0.21Mpa-0.23Mpa, the motor speed of the speed-regulating high-pressure diaphragm pump is maintained.

[0063] Preferably, in a self-feedback needle cleaning control method of the present embodiment, in a specific self-feedback needle cleaning control implementation system, a pressure relief pipeline connected in parallel with the needle washing pipeline is also provided at the liquid outlet of the speed-regulating high-pressure diaphragm pump 5, and a safety valve 6 is provided on the pressure relief pipeline. The safety valve 6 adopts a mechanical pressure relief valve. When the pressure of the needle washing pipeline exceeds the pressure value set by the safety valve 6, the cleaning liquid will flow out from the safety valve 6 to ensure that the pressure will not be higher than the set value during use, which is used to protect the needle washing pipeline. For example, the needle washing pressure range is set to 0.21Mpa-0.23Mpa, and the pressure of the pressure relief valve can be adjusted to 0.45Mpa. When the two normally closed solenoid valves 4 fail or the high-pressure needle opening attempt fails when the needle is blocked, leakage of the joint or damage to the pump valve caused by excessive liquid pressure can be avoided. Two normally open solenoid valves 7 are also provided on the pressure relief pipeline between the speed-regulating high-pressure diaphragm pump 5 and the safety valve 6. The two normally open solenoid valves 7 are used to open and close the pressure relief pipeline.

[0064] The liquid inlet end of the speed-regulated high-pressure diaphragm pump 5 is connected to the cleaning liquid storage tank 8 through a pipeline, and the liquid outlet end of the safety valve 6 is also connected to the cleaning liquid storage tank 8 through a pipeline, so that the cleaning liquid overflowed by overpressure flows back to the cleaning liquid storage tank 8.

[0065] Preferably, in a self-feedback needle cleaning control method of this embodiment, when the pressure sensor 1 detects that the needle washing pressure is significantly lower than 0.21Mpa, and still cannot reach the set value after increasing the speed of the speed-regulating high-pressure diaphragm pump 5, the needle washing system is judged to be abnormal, and the instrument automatically alarms, prompting maintenance personnel to intervene in maintenance, and the alarm mode includes flashing warning lights and sounding buzzers.

[0066] Preferably, in a self-feedback needle cleaning control method of this embodiment, when the needle washing pressure is higher than 0.23Mpa, the system reduces the liquid intake of the speed-regulated high-pressure diaphragm pump but the needle washing pressure still cannot be reduced, it is determined that the sampling needle is blocked and the instrument automatically alarms. When the sampling needle is blocked, the two normally open solenoid valves 7 close the pressure relief channel, and the motor speed of the speed-regulated high-pressure diaphragm pump 5 is continuously increased to increase the pressure of the needle washing pipeline to 0.6Mpa. The sampling needle is unblocked with high water pressure, and the pressure of the needle washing pipeline is increased to the first pressure value for continuous needle washing for 5 seconds. The speed-regulated high-pressure diaphragm pump 5 is turned off. If the pressure sensor detects that the pressure continues to drop to near 0 at this time, it is determined that the needle is unblocked successfully and the operation continues; if the pressure is still maintained at the first pressure value, it is determined that the needle is unblocked unsuccessfully, and the two normally open solenoid valves are opened to release part of the liquid to reduce the pressure of the entire system, and an alarm is sounded to prompt maintenance personnel to intervene.

[0067] Preferably, in a self-feedback needle cleaning control method of this embodiment, the comparison result of the numerical value received in S4 and the set pressure range value includes: when the needle washing pressure is lower than 0.21Mpa, increasing the motor speed of the speed-regulating high-pressure diaphragm pump, increasing the needle washing flow rate, and increasing the needle washing pressure; when the needle washing pressure is higher than 0.23Mpa, reducing the motor speed of the speed-regulating high-pressure diaphragm pump; when the needle washing pressure value is within 0.21Mpa-0.23Mpa, maintaining the motor speed of the speed-regulating high-pressure diaphragm pump.

[0068] The workflow of the present invention application is as follows: when washing the needle, the onboard pressure sensor collects the sampling needle pressure in real time, and transmits the digital signal converted in the pressure sensor to the MCU (microcontroller unit) through real-time communication. The MCU calculates the received numerical value and compares it with the specified numerical value to determine the next action, and controls the internal timer to output a pulse of a specific proportion to the diaphragm pump, so as to achieve the purpose of regulating the speed of the high-pressure diaphragm pump to ensure that the pressure of washing the needle is within the set range. For example, the needle washing pressure range is set to 0.21Mpa-0.23Mpa. When the needle washing pressure is lower than 0.21Mpa, the MCU output pulse duty cycle is increased, the motor speed of the speed regulating high-pressure diaphragm pump is increased, the flow rate is increased, and the needle washing pressure is increased. On the contrary, when the needle washing pressure is higher than 0.23Mpa, the MCU output pulse duty cycle is reduced, and the motor speed of the diaphragm pump is reduced.

[0069] Based on the above ideal embodiments of this application, the relevant staff can make various changes and modifications without departing from the technical concept of this application through the above description. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A self-feedback needle cleaning control method, characterized in that: The following steps are involved: S1: Set a pressure range value; S2: a pressure detection point is set on the needle washing pipeline connected to the sampling needle, and a pressure sensor is set at the pressure detection point to detect the liquid pressure in the needle washing pipeline; S3: transmitting the converted digital signal in the pressure sensor to the micro control unit through real-time communication; S4: The microcontroller unit calculates the received value and compares it with the set pressure range value, determines the next action, and controls the internal timer to output a pulse of a specific proportion to the speed-regulating high-pressure diaphragm pump; S5: The speed-regulated high-pressure diaphragm pump adjusts the motor speed according to the pulse signal, thereby controlling the needle washing flow rate; A self-feedback needle cleaning pipeline capable of executing the control method includes: A needle washing pipeline, the needle washing pipeline comprising a sampling needle, a pressure sensor, a sampling plunger pump and two normally closed solenoid valves connected in sequence; A speed-regulating high-pressure diaphragm pump for pressurizing the needle washing pipeline, a pressure relief pipeline connected in parallel with the needle washing pipeline is also provided at the liquid outlet of the speed-regulating high-pressure diaphragm pump, the pressure relief pipeline is provided with a safety valve and two normally open solenoid valves, and the solenoid valve is located between the speed-regulating high-pressure diaphragm pump and the safety valve; The method for cleaning the pipeline and unblocking the sampling needle comprises: When the needle washing pressure is higher than the upper limit of the set pressure range, the system reduces the liquid inflow of the speed-adjusting high-pressure diaphragm pump but the needle washing pressure still cannot be reduced, it is determined that the sampling needle is blocked and the instrument automatically alarms; When the sampling needle is blocked, the two normally open solenoid valves close the pressure relief channel, continuously increase the speed of the speed-adjustable high-pressure diaphragm pump motor, increase the pressure of the needle washing pipeline to the first pressure value, and continue to wash the needle for 5 seconds, and then turn off the speed-adjustable high-pressure diaphragm pump; If the pressure sensor detects that the pressure continues to drop to near 0, it is determined that the needle is successfully passed and the operation continues; If the pressure sensor detects that the pressure is maintained at the first pressure value, it is determined that the needle has failed, and the two normally open solenoid valves open to leak some liquid to reduce the pressure of the entire system, and an alarm is sounded to prompt maintenance personnel to intervene.

2. A self-feedback needle cleaning control method according to claim 1, characterized in that: When the pressure sensor detects that the needle washing pressure is significantly lower than the lower limit of the set pressure range, and still cannot reach the set value after increasing the speed of the high-pressure diaphragm pump, the needle washing system is judged to be abnormal, the instrument automatically alarms, and prompts maintenance personnel to intervene.

3. A self-feedback needle cleaning control method according to claim 1, characterized in that: The comparison result between the numerical value received in S4 and the set pressure range value includes, when the needle washing pressure is lower than the lower limit of the set pressure range value, increasing the motor speed of the speed-regulating high-pressure diaphragm pump, increasing the needle washing flow rate, and increasing the needle washing pressure.

4. A self-feedback needle cleaning control method according to claim 3, characterized in that: The comparison result between the numerical value received in S4 and the set pressure range value further includes, when the needle washing pressure is higher than the upper limit of the set pressure range value, reducing the motor speed of the speed-regulating high-pressure diaphragm pump.

5. A self-feedback needle cleaning control method according to claim 4, characterized in that: The comparison result between the numerical value received in S4 and the set pressure range value further includes maintaining the motor speed of the speed-regulated high-pressure diaphragm pump when the needle washing pressure value is within the set pressure range value.

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