Pump Head Tubing Detection Using Motor Current Feedback
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Solution Overview
Problem
Current pump systems for cooling in radiofrequency ablation procedures often operate all pump assemblies simultaneously, regardless of whether they are loaded with tubing, leading to unnecessary energy consumption and wear, as there is no effective method to detect the presence of tubing in individual pump heads.
Innovation Solution
A method and system that connect power supplies to each pump motor, sense motor currents, and disconnect power from pump motors without tubing, using frequency domain analysis to determine if tubing is loaded, allowing only necessary pump assemblies to operate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all pump assemblies are operated simultaneously, then cooling function is ensured for all probe assemblies, but energy consumption and wear increase unnecessarily when some pump heads are empty
Solution Approach 1:
The pump assembly performs self-diagnosis by monitoring its own motor current to detect whether tubing is loaded in the pump head. The control circuit automatically identifies empty pump heads through current analysis and deactivates them, allowing the system to self-regulate operation based on actual cooling needs without external intervention.
Solution Approach 2:
The system implements feedback control by continuously monitoring motor current and using this information to control pump operation. The control circuit receives current signals from the motor, analyzes them to determine tubing presence, and adjusts pump activation accordingly, creating a closed-loop system that optimizes energy usage based on real-time conditions.
2Reliability
If all pump assemblies are operated simultaneously, then system readiness is maintained, but device wear and maintenance requirements increase
Solution Approach 1:
The pump assembly monitors its own operational status through motor current analysis and automatically determines when it should be activated or deactivated. This self-service capability ensures that only pump heads with loaded tubing operate, extending component service life while maintaining system readiness when needed.
Solution Approach 2:
The system transitions from a static configuration where all pumps operate continuously to a dynamic system where pump operation is adjusted in real-time based on tubing presence. The control circuit enables flexible activation and deactivation of individual pump assemblies, optimizing both reliability and component longevity.
3Use of energy by moving object
If tubing presence detection is implemented, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical or optical detection methods with electrical current analysis. By monitoring motor current characteristics, the system determines tubing presence without requiring additional mechanical sensors, optical systems, or complex detection hardware, thus maintaining energy efficiency while minimizing added complexity.
Solution Approach 2:
The motor current serves multiple functions: it powers the motor and simultaneously provides detection information about tubing presence. This multi-functionality eliminates the need for separate detection systems, achieving energy efficiency improvements without proportionally increasing device complexity.
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
This approach reduces energy consumption and wear by ensuring only loaded pump assemblies are active, enhancing safety and efficiency by minimizing unnecessary operation of pump motors.
Implementation Method 1
sensing a motor current from each of the power supply cables
Implementation Method 2
each pump motor of the plurality of pump motors drives a pump head
Data Source
AI summary
Methods for detecting tubing in a pump assembly of a pump system are provided. For example, a method comprises connecting a power supply to each of a plurality of pump motors of the pump system. Each pump motor of the plurality of pump motors has a power supply cable configured to connect to the power supply and drives a pump head of a plurality of pump heads of the pump system. The method also comprises sensing a motor current from each of the power supply cables, determining whether tubing is loaded in each pump head, and, if tubing is not loaded in a pump head, then disconnecting from the power supply the power supply cable of the pump motor associated with the pump head in which tubing is not loaded. Systems for detecting the presence of tubing within a pump head of a plurality of pump heads also are provided.