Implant Telemetry Dynamic Frequency Tuning
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Solution Overview
Problem
Narrowband inductive links used in small medical implants face challenges in achieving reliable power transfer and data communication due to sensitivity to resonance frequency mismatches and oscillator drift, which is not effectively addressed by traditional RFID design principles.
Innovation Solution
Implementing a system where the reader determines and synchronizes with the resonance frequency of the implanted device using a phase-locked loop and tuning circuitry, allowing for accurate matching and maintaining transmission at the resonance frequency to ensure efficient power and data transfer, while minimizing components in the implant to maintain a small size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RFID design principles are used for narrowband inductive links in small medical implants, then device simplicity is maintained, but reliability of power transfer and data communication deteriorates due to sensitivity to resonance frequency mismatches and oscillator drift
Solution Approach 1:
The patent implements a phase-locked loop (PLL) system where the reader continuously monitors the resonance frequency of the implantable device and dynamically adjusts its transmission frequency to maintain synchronization. This feedback mechanism ensures reliable power transfer and data communication despite manufacturing tolerances and frequency drift, while keeping the implant itself simple without requiring complex tuning components.
Solution Approach 2:
The patent introduces an external reader as an intermediary device that performs the complex frequency determination and synchronization functions. The reader acts as a mediator between the implant and the power/data transfer system, handling all frequency tuning operations externally while the implant maintains a simple narrowband receiver design.
2Reliability
If multiple antennas and tuning components are added to the implant to improve frequency matching, then reliability of inductive coupling is improved, but device size and complexity increase
Solution Approach 1:
The patent extracts the complex frequency tuning and determination functionality from the implantable device and relocates it to the external reader. This allows the implant to maintain a minimal design with only essential components (battery, pump, simple telemetry receiver), while the reader handles all frequency synchronization tasks externally.
Solution Approach 2:
The external reader is designed to perform multiple functions: determining resonance frequency, synchronizing transmission frequency, transferring power inductively, and communicating data bidirectionally. This multi-functional approach consolidates complexity in a single external device rather than distributing it across multiple implant components.
3Use of energy by moving object
If the implant uses a narrowband receiver to maximize power transfer efficiency, then energy efficiency is improved, but the system becomes highly sensitive to frequency mismatches and drift
Solution Approach 1:
The patent implements dynamic frequency adjustment where the reader continuously adapts its transmission frequency to match the implant's resonance frequency. This dynamic synchronization maintains the narrowband receiver's high efficiency while compensating for frequency drift and mismatches in real-time, ensuring both energy efficiency and reliability.
Solution Approach 2:
The patent changes the operating frequency parameter dynamically by using the phase-locked loop to track and adjust the transmission frequency based on the detected resonance frequency of the implant. This parameter adaptation allows the system to maintain optimal power transfer efficiency despite variations in operating 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
This approach enhances the reliability and efficiency of power transfer and data communication in narrowband systems, maintaining usability even with manufacturing tolerances and frequency drifts, ensuring the system remains functional with minimal degradation.
Implementation Method 1
A number of parameters characterizing the efficiency of the coil antenna, e.g., the resonant frequency, gain, quality factor (Q factor), and the thermal effect (Joule effect or heat) are considered when selecting or designing the coil antenna.
Implementation Method 2
the thermal effect (Joule effect or heat) are considered when selecting or designing the coil antenna
Implementation Method 3
wireless charging of the battery powering the implanted device via inductive coupling
Data Source
AI summary
Systems and methods for maximizing the resonance frequency match between a reader and a controlled device interacting over a narrowband inductive link involve, in various embodiments, features of the controlled device, the reader, or both.