Endoscope Suction Tube Clogging Detection and Reverse Jet Control
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Solution Overview
Problem
Existing calculus collection systems face issues with suction tube clogging due to calculus being caught, leading to increased pressure and potential blockages during the perfusion process.
Innovation Solution
A perfusion state detection method and apparatus that monitor the relationship between suction pump drive output, flow rate, and suction pressure to detect abnormalities, such as calculus accumulation, and control the flow to prevent clogging by generating a reverse jet using a solenoid valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If calculus is collected by water feeding and suction, then calculus can be efficiently removed from the body, but the suction tube may become clogged by caught calculus
Solution Approach 1:
The system performs preliminary detection of clogging by monitoring the relationship between suction pressure and flow rate before complete clogging occurs. When abnormality is detected (deviation from normal pressure-flow relationship), the system proactively generates a reverse jet to prevent complete clogging, thereby maintaining suction tube patency while ensuring efficient calculus collection
Solution Approach 2:
The system periodically monitors the suction pressure and flow rate relationship to detect clogging tendencies. When abnormality is detected, a reverse jet is generated periodically to clear accumulated calculus, maintaining the suction tube in a patent state while preserving overall collection efficiency
2Productivity
If suction pressure is increased to improve calculus removal, then calculus can be extracted more effectively, but the risk of clogging increases
Solution Approach 1:
The system continuously monitors the relationship between suction pressure and flow rate to detect abnormalities indicating clogging risk. When the monitored parameters deviate from the normal relationship, the system provides feedback by generating a reverse jet to clear the suction tube, thereby maintaining effective calculus extraction while reducing clogging risk
Solution Approach 2:
The system uses its own suction pressure and flow rate measurements to self-diagnose clogging conditions. When abnormality is detected, the system self-corrects by generating a reverse jet through the valve mechanism, eliminating the need for external intervention and maintaining continuous effective operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents suction tube clogging by detecting calculus accumulation at an early stage and using a reverse jet to remove it, maintaining perfusion efficiency and preventing pressure increases.
Implementation Method 1
a suction pump configured to discharge the liquid from the inside of the living body via the suction conduit
Implementation Method 2
a valve configured to generate reverse jet in the suction conduit by a water hammering action
Data Source
AI summary
A perfusion state detection method includes: driving a liquid feeding pump configured to supply a liquid via a liquid feeding conduit inserted into a living body; driving a suction pump configured to discharge the liquid via a suction conduit inserted into the living body; obtaining a distance, on a plane indicating a relation between any two values of a drive output to the suction pump, a flow rate of the liquid flowing through the conduit, and a pressure in the conduit, between a coordinate on the plane of the two values in a perfusion state at normal time of the conduit and a coordinate on the plane of the two values actually measured; detecting abnormality of the perfusion state of the conduit based on whether the distance exceeds a threshold; and controlling a flow of the liquid in the conduit based on a detection result of the perfusion state.