Load-Induced Resonance Shift Keying for Wireless Biomedical Implants
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Solution Overview
Problem
Implanted biomedical devices require wireless power and data transmission to eliminate the restrictions and infection risks associated with wired connections, while existing technologies struggle to achieve simultaneous and efficient near-field wireless power and data transfer.
Innovation Solution
A wireless inductive telemetry link using a load-induced resonance-shift-keying modulation scheme, which employs a switch capacitor to modulate data signals and flip oscillations between two resonant frequencies, enabling simultaneous power transfer and data transmission through a pair of inductive coils with self-regulated power delivery over varying distances and loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired connections are used for power and data transmission, then reliable power delivery and data transfer are achieved, but patient movement is restricted and infection risk increases
Solution Approach 1:
The patent replaces mechanical wired connections with wireless inductive power and data transmission systems. The implanted device communicates with external equipment through electromagnetic fields generated by inductive coils, eliminating physical wires that restrict patient movement while maintaining reliable power and data transfer capabilities
2Ease of operation
If wireless inductive transmission is used, then patient movement freedom and infection risk are reduced, but simultaneous power and data transmission efficiency deteriorates
Solution Approach 1:
The patent merges power transmission and data transmission functions into a single wireless inductive link. By modulating data signals onto the power transmission carrier wave and using synchronized detection at the receiver, the system achieves simultaneous bidirectional communication and power transfer through one inductive coupling interface, improving overall system efficiency
Solution Approach 2:
The inductive link serves multiple functions simultaneously: it provides bidirectional data communication and bidirectional power transfer. The external device can transmit power to the implant while receiving data, and the implant can transmit data back while providing feedback, making the wireless interface universally capable of handling both energy and information transfer
3Productivity
If high data rates are transmitted, then data communication capability is improved, but power transfer stability and rectified voltage ripple increase
Solution Approach 1:
The patent employs periodic modulation of data signals at specific frequencies and uses synchronized periodic detection at the receiver. By structuring data transmission as periodic bursts with controlled duty cycles and using coherent detection synchronized to the carrier frequency, the system achieves high data rates while maintaining stable power transfer and minimizing voltage ripple through predictable, repeatable transmission patterns
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
The solution achieves efficient power transfer efficiency above 35% and data transmission at 5 Mbps, maintaining consistent power delivery and high data rates while minimizing ripple on the rectified voltage, thus addressing the need for wireless telemetry in biomedical implants.
Implementation Method 1
external transceiver including a demodulation circuit... and an internal transceiver including a modulation circuit... wherein the external transceiver is configured to transfer power to the internal transceiver
Implementation Method 2
the load-induced resonance-shift-keying modulation scheme is implemented by using a switch capacitor to flip oscillation between two resonant frequencies, ωL and ωH
Data Source
AI summary
Biomedical implants in accordance with various embodiments of the invention can be implemented in many different ways. The implants can be configured to receive power and transmit data, both wirelessly and simultaneously. Such devices can be configured to receive power from an external source and transmit data, such as but not limited to recorded neural data and/or other biological data, to outside the body. In many cases, the data is transmitted to the device that delivers power to the implant. For example, the power and data transmission system can be implemented with a pair of transceivers. The implant transceiver can receive power wirelessly though an external transceiver while simultaneously transmitting data to the external transceiver. In several embodiments, both forward (power) and reverse (data) links use the same pair of inductive coils in the transceivers, one coil mounted in the implant and the other in the external unit.