Drip Chamber Fluid Level Sensing Under Condensation and Cloudiness
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Solution Overview
Problem
Existing IV drip chamber monitoring systems are hindered by conditions such as discoloration, cloudiness, and condensation, leading to inaccurate detection of fluid levels and free flow conditions.
Innovation Solution
Integration of an integral fluid level detection assembly within the drip chamber using optical, acoustic, or RFID sensors to monitor fluid levels, providing real-time detection and closed-loop control to prevent free flow or occlusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external optical sensors or camera vision systems are used to monitor drip chamber fluid levels, then the system can detect free flow conditions, but the detection accuracy deteriorates under conditions of discoloration, cloudiness, condensation, or small accumulated water drops
Solution Approach 1:
The patent introduces an intermediary reflective surface (mirror or reflective coating) on the internal surface of the drip chamber to redirect optical signals from the fluid level to the external sensor. This intermediary mechanism overcomes the limitations of direct optical sensing by ensuring consistent signal reflection regardless of conditions such as discoloration, cloudiness, condensation, or small water drops on the chamber wall.
Solution Approach 2:
The patent uses optical reflection to create a virtual copy of the fluid level information that can be detected by the external sensor. By reflecting the light path off the internal surface, the system creates an alternative optical pathway that preserves fluid level detection accuracy despite obscuring conditions on the external chamber wall.
2Ease of operation
If external optical sensors are positioned to view through the drip chamber wall, then the system can monitor fluid levels, but the sensor becomes vulnerable to obscuration by condensation, cloudiness, or discoloration
Solution Approach 1:
The reflective surface acts as an intermediary that redirects optical signals from the fluid level to the external sensor, allowing the sensor to monitor fluid levels without being directly exposed to obscuring conditions on the drip chamber wall.
Solution Approach 2:
Instead of having the sensor directly view the fluid level through the chamber wall (direct illumination), the system inverts the approach by using a reflective surface to redirect light from the fluid level to the sensor (indirect illumination), thereby avoiding direct exposure to harmful conditions.
3Adaptability or versatility
If the drip chamber wall is made translucent to allow optical sensing, then the system can detect fluid levels, but the wall becomes susceptible to discoloration and condensation that interfere with detection
Solution Approach 1:
The reflective surface serves as an intermediary that decouples the optical sensing function from the translucent wall material. The reflection mechanism ensures reliable detection regardless of the wall's optical properties, making the system adaptable to various materials while maintaining detection reliability under adverse conditions.
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
Accurate and reliable monitoring of fluid levels in the drip chamber, enabling real-time detection of abnormal flow conditions and automatic adjustments to infusion pump operations.
Implementation Method 1
an optical sensor having a transmitter and a receiver, the transmitter and receiver positioned to transmit and receive an optical signal, respectively, at an angle relative to a fluid level in the drip chamber
Implementation Method 2
an acoustic sensor having a transmitter and a receiver, the transmitter and receiver positioned to transmit and receive an acoustic signal, respectively, at an angle relative to a fluid level in the drip chamber
Data Source
AI summary
Drip chamber detection assemblies for intravenous sets used with an infusion pump are provided. A drip chamber detection assembly includes a sensor coupled to a drip chamber. The sensor is positioned to generate signals related to the fluid level within the drip chamber. The signal data is transmitted to an infusion pump or a controller. A fluid level status or condition is determined and used for closed loop control of the infusion system, which generates an alarm and/or stops the infusion pump based on abnormal conditions. Methods of operating drip chamber detection assemblies are also provided.