Infrared Drip Sensor False Alarm Reduction in Enteral Pumps
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Solution Overview
Problem
Current enteral pumps experience false alarms due to fixed infrared beam sensitivity, which is inadequate for distinguishing between water and liquid nutrient flows, leading to increased costs and complexity with multiple motors for separate fluid delivery.
Innovation Solution
A method that adjusts infrared beam power dynamically to accommodate water droplets and residue, and automatically differentiates between water and liquid nutrient flows using a single motor by incrementally increasing beam power and monitoring pulse counts to adjust pumping rates accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed infrared beam power level is used, then the system can operate with simple hardware, but false alarms occur due to water droplets blocking the beam
Solution Approach 1:
The infrared beam power level is changed from fixed to dynamically adjustable. The system automatically increases beam power when water droplets are detected (indicated by absence of expected drop pulses), thereby maintaining reliable operation without requiring complex additional hardware components.
Solution Approach 2:
The infrared beam power parameter is modified adaptively based on detected conditions. The firmware monitors drop detection pulses and adjusts beam power levels accordingly, changing the operational parameter to maintain reliability while keeping hardware simple.
2Measurement precision
If higher infrared beam power is used, then water droplets can be seen, but liquid nutrient may become transparent to the beam causing detection failures
Solution Approach 1:
The infrared beam power is dynamically adjusted based on the type of liquid being pumped. The system detects liquid type using optical density measurements and automatically selects appropriate power levels to maintain reliable detection for both water and liquid nutrient conditions.
Solution Approach 2:
The beam power parameter is changed adaptively according to detected liquid type. The firmware modifies operational parameters based on real-time conditions, enabling reliable detection across different liquid types without manual intervention.
3Adaptability or versatility
If multiple motors are used to pump water and liquid nutrient separately, then fluid delivery flexibility is improved, but system cost and complexity increase
Solution Approach 1:
A single motor is designed to perform multiple functions by pumping both water and liquid nutrient through the same tubing set. The infrared detection system provides multi-functionality by detecting both liquid types, eliminating the need for separate pumping mechanisms while maintaining delivery flexibility.
Solution Approach 2:
The single motor system uses the infrared detection system to automatically identify liquid type and adjust pumping parameters accordingly. The system self-regulates to handle different fluids without requiring separate dedicated pumping mechanisms for each liquid type.
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
Reduces false alarms, lowers system costs by using a single motor, and ensures accurate fluid differentiation and delivery rates without hardware modifications, maintaining reliable operation and reducing operational complexity.
Implementation Method 1
an infrared (IR) light source (light emitting diode—LED) and infrared detector are positioned on opposing sides of the drip chamber transverse to the liquid flow. The IR beam passes through the drip chamber.
Implementation Method 2
the transparent wall of the drip chamber may become less transparent through the accumulation of liquid residue or droplets
Data Source
AI summary
The present invention provides a method of operating an infrared drip sensor in an enteral pump system to reduce false alarm conditions. The method consists of the following steps: optically coupling a infrared beam emitter with an infrared beam detector along an infrared beam path that extends through a drip chamber and intersects the drip path; monitoring the output signal of the infrared beam detector to detect pulses; monitoring the pulses for an interruption thereof; and running an infrared beam power update routine when an interruption is detected in the pulses, the infrared beam power update routine consisting of incrementally increasing a power level of the infrared beam until the power level of the infrared beam is sufficient to re-establish an output signal at the infrared beam detector.