Optical Cassette Detection Using Absorptive Window
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Solution Overview
Problem
Infusion pumps lack an effective means to ensure proper loading of a matching cassette, which is crucial for safety features like anti-free flow protection and volumetric accuracy, and to prevent uncontrolled fluid delivery.
Innovation Solution
An optical detection system is integrated into the infusion pump to verify the presence of a properly loaded cassette using an optical emitter, detector, and a window with predetermined absorptance, which generates a signal that enables or disables pump operation based on the cassette's presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no optical detection system is used, then the pump structure remains simple, but the safety of fluid delivery cannot be ensured
Solution Approach 1:
The patent replaces complex mechanical detection mechanisms with an optical detection system. The optical emitter and detector use light transmission through a window in the cassette to determine proper loading, eliminating the need for complex mechanical switches, sensors, or moving parts while ensuring reliable detection of cassette presence and proper installation.
Solution Approach 2:
The patent introduces an optical window as an intermediary element in the cassette that mediates the detection process. This window allows light to pass through when the cassette is properly loaded, creating a simple yet reliable optical signal that indicates correct cassette installation without requiring complex mechanical or electronic interfaces.
2Measurement precision
If mechanical detection methods are used to verify cassette loading, then the detection mechanism is simple, but detection precision is insufficient
Solution Approach 1:
The patent substitutes mechanical detection methods with an optical detection system. The optical emitter and detector provide precise detection of cassette presence and proper loading by measuring light transmission through the cassette window, achieving high measurement precision without complex mechanical sensors, switches, or moving parts.
3Reliability
If safety features are added to the cassette, then patient protection is improved, but the difficulty of detecting proper loading increases
Solution Approach 1:
The patent introduces an optical window as an intermediary element that works in conjunction with safety features like the anti-free flow mechanism. This window provides a simple optical signal path that indicates proper cassette installation, making it easy to detect correct loading even when multiple safety features are present, by translating complex mechanical properness into a simple light transmission signal.
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
Ensures safe operation by preventing pump activation unless a matching cassette is correctly loaded, thereby maintaining safety features and ensuring accurate fluid delivery.
Implementation Method 1
an optical emitter mounted to the pump and arranged to emit a light beam directed along an optical axis, and a photosensitive detector mounted to the pump and arranged to receive the light beam along the optical axis
Implementation Method 2
The window absorbs a portion of the light beam and transmits another portion of the light beam
Data Source
AI summary
An infusion pump has an optical cassette detection system for determining whether or not a cassette of an administration tubing set is properly loaded in the pump. Operation of the pump may be enabled or disabled based on a determination of the cassette detection system. The cassette detection system includes a light emitter and a corresponding photosensitive detector aligned along an optical axis, and window carried by the cassette. When the cassette is properly loaded in the pump, a light beam from the emitter enters the window, where a portion of the beam is absorbed and another portion of the beam is transmitted for receipt by the detector. The detector signal is evaluated by signal evaluation electronics to determine if the cassette is loaded. The determination may be based on an expected attenuation of the light beam corresponding to a predetermined light absorptance property of the window.