Implantable Pulse Generator Signal Generation Architecture
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Solution Overview
Problem
Current spinal cord stimulators face challenges with power consumption and the ability to generate diverse stimulation patterns simultaneously, limiting their effectiveness in treating varying degrees of pain across different body areas.
Innovation Solution
An implantable pulse generator (IPG) with a programmable signal generator that can operate without processor intervention to conserve battery power, featuring control registers for stimulation channels, an arbitrator to prevent channel overlap, and high-frequency generators for modulating timing signals, enabling flexible programming of pulse parameters across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the processor continuously controls the signal generation, then the stimulation patterns can be precisely controlled, but the battery power is consumed rapidly
Solution Approach 1:
The patent divides the control system into two independent parts: a programmable signal generator that autonomously produces stimulation patterns based on pre-stored parameters, and a processor that only intervenes for programming and monitoring. This segmentation allows the signal generator to operate without continuous processor intervention, significantly reducing power consumption while maintaining precise stimulation control through the programmable architecture.
2Adaptability or versatility
If multiple stimulation channels are activated simultaneously, then different body areas can be treated concurrently, but the power supply may be overloaded
Solution Approach 1:
The patent implements dynamic channel management where the arbitrator continuously monitors and adjusts channel activation in real-time. Based on power availability and treatment requirements, the system dynamically selects which channels to activate, allowing flexible concurrent treatment of multiple body areas while preventing power overload through adaptive control.
Solution Approach 2:
The arbitrator acts as an intermediary between the multiple stimulation channels and the power supply. It receives timing signals from all channels, intelligently selects which channels to activate based on power constraints and treatment priorities, and coordinates their operation to prevent power overload while maximizing therapeutic benefit.
3Ease of operation
If percutaneous trial stimulator is used, then the implantation can be tested before permanent installation, but the stimulator tends to move from its original location
Solution Approach 1:
The patent employs a disposable percutaneous trial stimulator designed for temporary use during the trial period. This trial device is intentionally designed to be less permanent and more easily removable than the final implant, allowing safe testing of stimulation parameters and effectiveness before committing to permanent surgical implantation. The trial stimulator's temporary nature facilitates easy adjustment and removal if needed.
Data Source
AI summary
An implantable pulse generator (IPG) that generates spinal cord stimulation signals for a human body has a programmable signal generator that can generate the signals based on stored signal parameters without any intervention from a processor that controls the overall operation of the IPG. While the signal generator is generating the signals the processor can be in a standby mode to substantially save battery power.