Implantable Medical Device Wakeup via Always-On RF Demodulator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for waking up implantable medical devices from a dormant state are inefficient in terms of power consumption and latency, often requiring close proximity to external devices and additional hardware, and lack reliable authentication mechanisms.
Innovation Solution
A method involving a modulated wakeup signal sent by an external device, which is demodulated by always-on demodulator circuitry in the implantable device, eliminating the need for active scanning and allowing for a fast, low-energy wake-up process, with shared antenna and frontend matching circuitry for reduced components and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic RF receiver sniffing is used to detect wakeup signals, then the device can detect advertising messages from external devices, but the battery power consumption increases and wakeup latency increases
Solution Approach 1:
The patent applies preliminary action by continuously monitoring the RF channel in a low-power state before full device activation is needed. The RF detector circuitry performs preliminary detection of advertising messages without requiring the main processor or full communication stack to be active, thus preparing for wakeup before high-power consumption begins.
Solution Approach 2:
The patent segments the wakeup detection function into a separate low-power RF detector circuitry that operates independently from the main device processor. This segmentation allows the detector to run continuously at minimal power while the main device remains in deep sleep, and only activates the high-power communication components when a valid wakeup signal is detected.
2Adaptability or versatility
If the implantable medical device periodically scans for Bluetooth advertising signals, then it can establish communication connections, but the wakeup process becomes slower and consumes more battery power
Solution Approach 1:
The RF detector circuitry continuously monitors for advertising messages from external devices even when the main device is in dormant state. This preliminary detection action eliminates the need for periodic scanning by the main processor, as the detector is already positioned to immediately recognize and trigger wakeup upon detecting a valid advertising message.
3Reliability
If inductive coil communication is used to wake up the device, then wireless communication can be established, but the external device must be placed in close proximity (about 2 cm) to the implantable medical device
Solution Approach 1:
The patent replaces the mechanical proximity requirement of inductive coil communication with RF-based advertising message detection. Instead of requiring physical close proximity for magnetic field coupling, the system uses RF signal detection that can operate at greater distances, substituting the mechanical constraint with an electromagnetic field-based solution.
4Reliability
If dedicated external RF hardware is used to generate wakeup messages, then wakeup communication can be achieved, but the design, fabrication and distribution costs increase and additional hardware support functions are required
Solution Approach 1:
The patent makes the external device (such as a smartphone) perform multiple functions: it serves as both the user interface device and the wakeup signal generator. The external device's existing RF communication capabilities are repurposed to generate Bluetooth advertising messages that function as wakeup signals, eliminating the need for dedicated wakeup hardware and reducing overall system complexity.
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 results in a power-efficient and rapid wake-up process with enhanced security and reduced production costs, enabling reliable authentication and communication without the need for additional hardware.
Implementation Method 1
demodulating the modulated wakeup signal by means of demodulator circuitry of the implantable medical device so as to produce a demodulated wakeup signal
Data Source
AI summary
A method for waking up an implantable medical device from a dormant state, an implantable medical device, and a system that includes such an implantable medical device and an external device. The implantable medical device is woken up from a dormant state by sending a modulated wakeup signal via a wireless link from an external device. The modulated wakeup signal is demodulated by way of a demodulator circuitry of the implantable medical device so as to produce a demodulated wakeup signal. The demodulator circuitry is permanently ready for operation. An awake state of the implantable medical device is then activated in response to the demodulated wakeup signal.