Endoscope leak detection method based on full-automatic endoscope cleaning and disinfecting machine
The endoscope leak detection method uses a check valve and PWM-controlled air pump to address contamination and misjudgment issues, ensuring fast and accurate leak detection without damaging the endoscope.
Patent Information
- Application Number
- CN202411244915.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2024-12-31
AI Technical Summary
Existing automatic endoscope leak detection systems face issues with contamination during cleaning and disinfection due to fluid ingress and poor air pressure stability, leading to misjudgments and low accuracy.
An endoscope leak detection method using a check valve joint and a PWM speed-controlled air pump, with a controller adjusting the duty cycle of the inflation pump based on real-time pressure differences and stability checks, ensuring accurate and stable pressure regulation.
The method ensures fast and accurate leak detection with minimal damage to the endoscope, maintaining high detection accuracy and preventing contamination during the cleaning process.
Smart Images
Figure CN119223546A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of endoscope leak detection, and in particular to an endoscope leak detection method based on a full-automatic endoscope cleaning and disinfecting machine. Background Art
[0002] An endoscope, also known as an endoscope, is a tube equipped with a light that can enter the human body through the body's natural orifices or through a small incision made during surgery. An endoscope can be used to see lesions that cannot be shown by X-rays, so it is very useful to doctors.
[0003] Leak detection of medical endoscopes is an important step after cleaning and disinfection. There are two ways to detect leaks: manual and automatic. Manual leak detection is not only cumbersome to operate and wastes manpower, but also involves many human factors and has a large accuracy error. Automatic leak detection is to use an automatic leak detection system for automatic measurement. The existing automatic leak detection system includes a controller, a display screen, an air pump, a pressure relief valve, a pressure gauge and an endoscope test connector. The air pump is connected to the endoscope test connector via an air charging pipeline. A pressure relief valve and a pressure gauge are installed on the air charging pipeline. The controller is respectively connected to the display screen, the air pump, the pressure relief valve and the pressure gauge. The controller is used to control the operation of the air pump and the pressure relief valve. The pressure gauge is used to detect the pressure inside the endoscope in real time and display it on the display screen through the controller control. The endoscope test connector is used to connect to the leak detection connector on the endoscope cavity. The existing endoscope test joint and the leak detection joint on the endoscope include a straight-through valve and a check valve. When the straight-through valve is used for connection, the cleaning fluid will enter the endoscope cavity during the cleaning and disinfection process of the endoscope by the fully automatic endoscope cleaning and disinfecting machine, which is easy to cause contamination and affect the service life of the endoscope; when the check valve is used for connection, when the cavity inside the endoscope is inflated, due to the diameter change phenomenon, the air pressure stability during the inflation and pressurization process is poor, which is easy to cause misjudgment and low accuracy. Summary of the invention
[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art. In view of the fact that water is easily ingressed into endoscopes during immersion cleaning and disinfection by a fully automatic endoscope cleaning and disinfecting machine, an endoscope leak detection method based on a fully automatic endoscope cleaning and disinfecting machine is provided, which adopts a check valve joint for leak detection.
[0005] The technical solution of the present invention is:
[0006] An endoscope leak detection method based on a fully automatic endoscope cleaning and disinfecting machine is characterized by comprising the following steps:
[0007] Step 1: Use a check valve for the endoscope test connector and the leak detection connector on the endoscope, and use a PWM speed-controlled air pump to connect the endoscope test connector to the leak detection connector on the cleaned and disinfected endoscope.
[0008] Step 2: The controller outputs an initial control signal to the inflation pump, controls the inflation pump to inflate and pressurize the endoscope cavity; and simultaneously starts the inflation timer to record the inflation time th;
[0009] Step 3: The controller obtains the pressure value Pr of the endoscope cavity in real time through the pressure gauge, and obtains the difference between Pr and Pt and the difference between th and Th;
[0010] Step 4, when Pr-Pt<0, th-Th<0, the controller obtains the current error value Pe_c=Pt-Pr; and integrates the previous errors to obtain the cumulative error value: Ie_c=Ie_b+Pe_c; Ie_c is the cumulative error value at the current moment, Ie_b is the cumulative error value at the previous moment, where the initial values of Ie_b and Pe_c are 0; the current error value and the cumulative error value obtained are multiplied by the corresponding coefficients Cp and Ci respectively to obtain the duty cycle update coefficient Cp*Pe_c+Ci*Ie_c, and the duty cycle update coefficient is multiplied by the current duty cycle Duty_b to obtain a new duty cycle Duty_c; the new duty cycle Duty_c is used to update the duty cycle of the control signal (PWM wave) of the inflation pump, and step 3 is repeated; where Cp=0.5, Ci=0.032;
[0011] When Pr-Pt<0, th-Th≥0, the endoscope cavity is judged to be leaking;
[0012] When Pr-Pt≥0, the controller controls the air pump to stop working and verify the air pressure stability;
[0013] Step 5: If the air pressure is unstable, return to step 3; if the air pressure is stable, the controller controls the air pump to stop working, starts the timer counting mode, and performs the leak detection monitoring process. The leak detection monitoring process is as follows: the timer counts once a second and performs a self-add operation: T_c = T_b + 1; the count value T_b = T_c at the previous moment is updated; the real-time pressure value Pr is obtained through the pressure gauge. If Pr < Pa, it means that there is a leak in the endoscope cavity; the air tightness of the endoscope is unqualified, and the test is terminated; if Pr ≥ Pa, further determine whether the leak detection time T_c has reached the leak detection time setting value T; if T_c < T, continue the leak detection monitoring process; if T_c ≥ T, it is determined that there is no leak and the air tightness of the endoscope is qualified. T is usually 20-60s.
[0014] The specific method for verifying the air pressure stability described in the present invention is: read the Pr value once every 1S, if Pr is not less than Pt, add 1 to the count value, when the count value is equal to 5, the air pressure is judged to be stable, otherwise the air pressure is judged to be unstable and the count value is reset.
[0015] The initial control signal described in the present invention is a PWM wave with a frequency of 20 Hz and a duty cycle of 50%.
[0016] The present invention controls the inflation speed of the PWM speed-regulated inflation pump by controlling the duty cycle of the control signal, thereby realizing that before the pressure in the endoscope lumen reaches the target pressure value Pt, the automatic leak detection system inflates and pressurizes the endoscope lumen at the fastest speed, and during the inflation and pressurization process, the pressure gauge will not make misjudgments and the detection accuracy is high. The pressure inside the endoscope lumen increases slowly in the later stage, and the endoscope will not be damaged due to excessive pressure increase in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the automatic leak detection system described in the present invention.
[0018] Figure 2 The figure is a leak detection flow chart of the endoscopic leak detection method described in the present invention. DETAILED DESCRIPTION
[0019] like Figure 1 The automatic leak detection system shown includes a display screen, a controller, an air pump, a pressure relief valve, a pressure gauge and an endoscope test connector. The air pump is connected to the endoscope test connector via an air charging pipeline. A pressure relief valve and a pressure gauge are installed on the air charging pipeline. The pressure gauge uses a sensor GZP6859D. The controller is connected to the display screen, the air pump, the pressure relief valve and the pressure gauge respectively. The controller controls the operation of the air pump and the pressure relief valve. The pressure gauge is used to detect the pressure inside the endoscope in real time and display it on the display screen after calculation by the controller. The endoscope test connector is used to connect to the leak detection connector on the endoscope cavity. Furthermore, an alarm is also connected to the controller.
[0020] The endoscope leak detection method based on the fully automatic endoscope cleaning and disinfection machine completed by using the above-mentioned automatic leak detection system comprises the following steps:
[0021] Step 1: Use a check valve for the endoscope test connector of the automatic leak detection system and the leak detection connector on the endoscope, and use a PWM speed-controlled air pump to connect the endoscope test connector of the automatic leak detection system to the leak detection connector on the endoscope that has been cleaned and disinfected by the fully automatic endoscope cleaning and disinfecting machine;
[0022] Step 2: Use the controller to set the leak detection target pressure value Pt, monitoring pressure value Pa, maximum inflation time Th and initial control signal. The controller outputs the initial control signal to the inflation pump, controls the inflation pump to inflate and pressurize the endoscope cavity, and starts the inflation timer to record the inflation time th; Pt = 20kpa, Pa = 18kpa, Th = 30s, the initial control signal is a PWM wave with a frequency of 20Hz and a duty cycle of 50%, and the inflation timer uses the controller's clock system; the specific test process is as follows: Figure 2 shown.
[0023] Step 3: The controller obtains the pressure value Pr of the endoscope cavity in real time through the pressure gauge of the automatic leak detection system, displays the current pressure value Pr on the display screen, and obtains the difference between Pr and Pt and the difference between th and Th;
[0024] Step 4. When Pr-Pt<0, th-Th<0, the controller obtains the current error value of the leakage pressure difference Pe_c=Pt-Pr; and integrates the error values of the previous leakage pressure difference to obtain the cumulative error value: Ie_c=Ie_b+Pe_c; updates the previous cumulative error Ie_b=Ie_c; Ie_c is the cumulative error value at the current moment, and Ie_b is the cumulative error value at the previous moment; the initial values of Ie_b and Pe_c are 0; the current error value and the cumulative error value obtained are multiplied by the corresponding coefficients Cp and Ci respectively to obtain the duty cycle update coefficient: Cp*Pe_c+Ci*Ie_ c, in this implementation, Cp=0.5, Ci=0.032; multiply the duty cycle update coefficient by the current duty cycle Duty_b of the control signal of the inflation pump to obtain a new duty cycle Duty_c, Duty_c=Duty_b*(Cp*Pe_c+Ci*Ie_c); use the new duty cycle Duty_c to update the duty cycle of the control signal (PWM wave) of the inflation pump in the controller as: Duty_b=Duty_c; proceed to step 3 to repeat the measurement of Pr; the controller performs a measurement every 1s; the output PWM duty cycle will also become smaller and smaller, and finally the pressure value of the endoscope cavity will reach our set value Pt;
[0025] When Pr-Pt<0, th-Th≥0, the endoscope cavity is judged to be leaking and the test is terminated;
[0026] When Pr-Pt≥0, the controller controls the air pump to stop working and verify the air pressure stability;
[0027] Step 5: If the air pressure is unstable, return to step 3; if the air pressure is stable, start the timer counting mode and perform the leak detection monitoring process. The leak detection monitoring process is as follows: the timer counts once per second and performs a self-increment operation: T_c=T_b+1; the count value at the previous moment is updated to T_b=T_c, where T_b is the count value at the previous moment and T_c is the count value at the current moment; the real-time pressure value Pr of the sensor GZP6859D is obtained through IIC communication. If Pr<Pa, it means that there is a leak in the endoscope cavity and the air tightness of the endoscope is unqualified. The display screen outputs an alarm signal to the alarm to prompt the user that there is a leak in the endoscope cavity. At the same time, the counting function of the counter is turned off and the count is reset to T_b=0, and the test ends. If Pr≥Pa, it is further determined whether the leak detection time T_c has reached the leak detection time setting value T (T=30 seconds); if T_c<T, the leak detection monitoring process is continued (count value plus 1, obtain real-time pressure value Pr, determine pressure value, determine whether the leak detection time has been reached); if T_c≥T, it is determined that there is no leak and the endoscope is qualified for air tightness. The timer counting mode is implemented using the clock system of the controller.
[0028] The specific method for verifying the air pressure stability described in the present invention is: read the Pr value once every 1S. If Pr is not less than Pt, the count value is increased by 1. When the count value is equal to 5 (5 cycles, 5 times Pr is not less than Pt), the air pressure is judged to be stable, otherwise the air pressure is judged to be unstable and the count value is reset to zero.
[0029] The present invention controls the inflation speed of the PWM speed-regulated inflation pump by controlling the duty cycle of the control signal, thereby realizing that before the pressure in the endoscope lumen reaches the target pressure value Pt, the automatic leak detection system inflates and pressurizes the endoscope lumen at the fastest speed, and during the inflation and pressurization process, the pressure gauge will not make misjudgments and the detection accuracy is high. The pressure inside the endoscope lumen increases slowly in the later stage, and the endoscope will not be damaged due to excessive pressure increase in a short period of time and exceeding the Pt value too much.
Claims
1. An endoscope leak detection method based on a fully automatic endoscope cleaning and disinfecting machine, characterized in that The steps include: Step 1: Use a check valve for the endoscope test connector and the leak detection connector on the endoscope, and use a PWM speed-controlled air pump to connect the endoscope test connector to the leak detection connector on the cleaned and disinfected endoscope. Step 2: The controller outputs an initial control signal to the inflation pump, controls the inflation pump to inflate and pressurize the endoscope cavity; and simultaneously starts the inflation timer to record the inflation time th; Step 3: The controller obtains the pressure value Pr of the endoscope cavity in real time through the pressure gauge, and obtains the difference between Pr and Pt and the difference between th and Th; Step 4, when Pr-Pt<0, th-Th<0, the controller obtains the current error value Pe_c=Pt-Pr; and integrates the previous errors to obtain the cumulative error value: Ie_c=Ie_b+Pe_c; Ie_c is the cumulative error value at the current moment, Ie_b is the cumulative error value at the previous moment, where the initial values of Ie_b and Pe_c are 0; the current error value and the cumulative error value obtained are multiplied by the corresponding coefficients Cp and Ci respectively to obtain the duty cycle update coefficient Cp*Pe_c+Ci*Ie_c, and the duty cycle update coefficient is multiplied by the current duty cycle Duty_b to obtain a new duty cycle Duty_c; the new duty cycle Duty_c is used to update the duty cycle of the control signal (PWM wave) of the inflation pump, and step 3 is repeated; where Cp=0.5, Ci=0.032; When Pr-Pt<0, th-Th≥0, the endoscope cavity is judged to be leaking; When Pr-Pt≥0, the controller controls the air pump to stop working and verify the air pressure stability; Step 5. If the air pressure is unstable, return to step 3; if the air pressure is stable, the controller controls the air pump to stop working, starts the timer counting mode, and performs a leak detection monitoring process. The leak detection monitoring process is as follows: the timer counts once per second and performs a self-increment operation: T_c=T_b+1; the count value T_b=T_c at the previous moment is updated; the pressure value Pr of the endoscope lumen is obtained in real time by the pressure gauge. If Pr<Pa, the pressure value Pr of the endoscope lumen is obtained by the pressure gauge in real time, indicating that there is a leak in the endoscope lumen; the air tightness of the endoscope is unqualified and the test is terminated; if Pr≥Pa, further determine whether the leak detection time T_c has reached the leak detection time setting value T; if T_c<T, continue the leak detection monitoring process; if T_c≥T, it is determined that there is no leak and the air tightness of the endoscope is qualified.
2. The endoscope leak detection method based on the fully automatic endoscope cleaning and disinfecting machine according to claim 1 is characterized in that: The specific method for verifying the air pressure stability is: read the Pr value once every 1S, if Pr is not less than Pt, add 1 to the count value, and when the count value is equal to 5, the air pressure is judged to be stable, otherwise the air pressure is judged to be unstable and the count value is reset to zero.
3. The endoscope leak detection method based on the fully automatic endoscope cleaning and disinfecting machine according to claim 1 is characterized in that: The initial control signal is a PWM wave with a frequency of 20 Hz and a duty cycle of 50%.