RFID Tag Sterilization Verification via Resonance Frequency Shift
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Solution Overview
Problem
There is a need for a simple and independent method to verify that medical or pharmaceutical devices have been properly sterilized, such as through autoclaving or radiation, without requiring knowledge of the underlying circuitry or complex procedures, as existing methods can fail to ensure effective sterilization and are cumbersome to deploy.
Innovation Solution
The method modifies the wireless transmission characteristics of RFID tags by altering their bandwidth or resonance frequency in response to environmental conditions like radiation, temperature, or shock, using external circuits with variable components that change state upon exposure to these conditions, allowing for remote verification without affecting the tag's operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical color changing dyes are used to indicate successful radiation exposure, then sterilization verification is provided, but the method cannot detect other sterilization methods like autoclaving or freezing and requires visual inspection rather than independent verification
Solution Approach 1:
The patent uses RFID tags whose electromagnetic parameters (resonance frequency, impedance, bandwidth) change in response to sterilization conditions. Instead of relying on chemical dyes that only work for radiation, the RFID tag's electrical characteristics are modified by exposure to various sterilization methods including autoclaving, freezing, and radiation, enabling universal verification across all sterilization types.
Solution Approach 2:
The patent replaces visual inspection of chemical dyes with electronic detection of RFID tag parameter changes. The verification system uses wireless communication to read changes in the RFID tag's electromagnetic characteristics, substituting manual visual verification with automated electronic detection that can independently confirm sterilization regardless of the method used.
2Reliability
If semiconductor components with sensing circuits are used to detect radiation effects, then sterilization information is stored, but the operator must understand complex communication protocols and memory locations to access the information
Solution Approach 1:
The RFID tag automatically detects sterilization conditions and self-modifies its electromagnetic parameters accordingly. The tag performs the verification function autonomously by changing its own characteristics in response to sterilization exposure, eliminating the need for external sensing circuits or complex storage protocols. The verification information is embedded directly in the tag's electromagnetic signature, which can be read without understanding internal circuitry.
Solution Approach 2:
Instead of storing verification data in memory locations requiring protocol knowledge, the patent encodes sterilization verification information directly into changes in the RFID tag's electromagnetic parameters. The resonance frequency, impedance, or bandwidth shifts serve as the verification signal itself, allowing any RFID reader to detect sterilization status without needing to interpret complex data formats or access specific memory addresses.
3Reliability
If process engineering controls with linear manufacturing sequences are used, then device sterilization is ensured, but equipment malfunction or obstruction can still result in inadequate sterilization that fulfills process controls
Solution Approach 1:
The patent incorporates feedback by using the RFID tag to monitor actual sterilization conditions and provide verification that sterilization was effective. The tag's parameter changes confirm that the device was properly exposed to sterilization conditions, providing real-world verification that complements process controls and alerts to potential failures where equipment malfunctioned or obstructions prevented adequate sterilization.
4Reliability
If independent verification methods are developed, then customer assurance of correct sterilization processing is improved, but the methods become more complex and require difficult or cumbersome procedures to deploy
Solution Approach 1:
The RFID tag serves multiple functions: it provides product identification, tracking, and sterilization verification all in a single component. The same tag that identifies the device also automatically verifies sterilization through its parameter changes, eliminating the need for separate verification systems or procedures. This multi-functionality reduces overall system complexity while providing comprehensive customer assurance.
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 provides quick and simple verification of sterilization processes, ensuring that devices have been correctly exposed to required conditions without requiring complex understanding of the device's circuitry, and can be easily deployed, enhancing assurance of sterilization effectiveness.
Implementation Method 1
The method modifies the wireless transmission characteristics of RFID tags by altering their bandwidth or resonance frequency in response to environmental conditions like radiation, temperature, or shock
Data Source
AI summary
A system and method for verifying the occurrence of an environmental condition is disclosed. Rather than store information concerning the occurrence and/or success of the sterilization process, the present invention modifies the wireless transmission characteristics of the device. In some embodiments, the bandwidth of the wireless transceiver is altered as a result of undergoing sterilization. In other embodiments, the resonance frequency of the circuit is affected. In other embodiments, one or more of these parameters are affected based on other environmental conditions, such as shock or vibration.