Optical Flowrate Detection in Dialysis Cassette
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Solution Overview
Problem
Current dialysis systems face challenges in accurately measuring dialysate flowrate and detecting air or gas bubbles and fibrin particles, and they lack an efficient method for heating dialysate to body temperature within a disposable cassette.
Innovation Solution
A system that includes an optically transparent viewing window in the dialysate pathway for imaging gas bubbles and fibrin particles, using a camera and light source to determine flowrate, and an inductive heater for efficiently heating the dialysate within a cassette, eliminating the need for external heating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a disposable cassette is used for dialysis treatment, then ease of operation and hygiene are improved, but the ability to accurately measure flowrate and detect particles is worsened due to lack of integrated sensing capabilities
Solution Approach 1:
The patent combines the disposable cassette with integrated optical sensing capabilities, merging the fluid delivery function with flowrate measurement and particle detection functions into a single unit. This allows accurate measurements to be achieved while maintaining the ease of operation benefits of disposable cassettes.
Solution Approach 2:
The disposable cassette is designed to serve multiple functions: fluid delivery, flowrate measurement via optical detection, and particle detection. This multi-functionality eliminates the need for separate sensing equipment while maintaining operational simplicity.
2Temperature
If external heating elements are used to heat dialysate, then heating capability is provided, but device complexity and space requirements increase
Solution Approach 1:
The heating element is integrated directly into the disposable cassette structure, merging the thermal processing function with the fluid delivery system. This eliminates the need for separate external heating equipment and reduces overall system complexity.
Solution Approach 2:
The disposable cassette is designed to be self-heating through an integrated heating element, allowing it to maintain dialysate temperature independently without requiring external heating infrastructure.
3Measurement precision
If traditional flowrate measurement methods are used, then flowrate can be monitored, but detection of gas bubbles and fibrin particles is not achieved
Solution Approach 1:
The optical detection system is designed to perform multiple detection functions simultaneously: measuring flowrate by tracking bubble movement, detecting gas bubbles, and identifying fibrin particles. This single system provides versatile detection capabilities across multiple parameters.
Solution Approach 2:
The system uses optical properties including light absorption and scattering characteristics to differentiate between gas bubbles and fibrin particles, leveraging their different optical signatures for accurate identification and classification.
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
Enables accurate flowrate measurement and detection of gas bubbles and fibrin particles, while providing a compact and efficient heating solution that maintains dialysate at body temperature, improving the reliability and efficiency of dialysis treatments.
Implementation Method 1
A first aspect of the present disclosure includes an improved system for medical fluid flowrate detection... A camera and light source are placed relative to the viewing window, such that the camera is able to image gas bubbles and/or fibrin particles flowing within the liquid
Implementation Method 2
an inductive heater for efficiently heating the dialysate within a cassette
Data Source
AI summary
A medical fluid machine includes an enclosure; a disposable unit accepted by the enclosure, the disposable unit including a conduit through which a medical fluid can flow, the conduit including a viewing portion; a light source configured and arranged to emit light onto the viewing portion of the conduit; a camera focused on the viewing portion of the conduit; and a processor configured to determine a speed of a particle entrained in the medical fluid based on at least two images of the particle in the viewing area taken by the camera.