Depletion Block Nerve Stimulation via Neurotransmitter Depletion
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Solution Overview
Problem
Current methods for blocking nerve communication, such as kilohertz high frequency alternating current (KHFAC) and direct current (DC) nerve blocks, face limitations including uncomfortable sensations and safety concerns for chronic applications, as they either cause intense firing bursts or deliver unrecoverable charge to neural tissue.
Innovation Solution
A system that applies electrical signals at frequencies between 100 Hz to 1000 Hz to deplete neurotransmitters from presynaptic terminals, allowing for a full or partial depletion block of nerve communication, which is quickly reversed upon signal termination, thereby avoiding the drawbacks of KHFAC and DC blocking techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If KHFAC is used to block nerve communication, then nerve blocking effect is achieved, but intense firing bursts occur causing uncomfortable sensation
Solution Approach 1:
The patent changes the stimulation parameters from KHFAC (kilohertz frequency) to a lower frequency range (100-1000 Hz) combined with specific pulse widths and amplitudes that exceed the stimulation threshold. This parameter change achieves nerve blocking through neurotransmitter depletion rather than intense firing, eliminating uncomfortable sensations while maintaining blocking effectiveness.
2Reliability
If DC is used to block nerve communication, then nerve blocking effect is achieved, but unrecoverable charge is delivered to neural tissue
Solution Approach 1:
The patent employs periodic electrical pulses instead of continuous DC current. The pulsed delivery method allows for controlled charge accumulation that depletes neurotransmitters without delivering unrecoverable charge to the tissue. The periodic nature of the stimulation enables safe chronic application while maintaining effective nerve blocking.
3Reliability
If stimulation intensity exceeds threshold to deplete neurotransmitters, then nerve communication is blocked, but energy consumption increases
Solution Approach 1:
The patent applies stimulation intensity that exceeds the threshold just enough to deplete neurotransmitters effectively. By targeting the specific threshold for neurotransmitter depletion rather than using excessive intensity, the method achieves reliable nerve blocking with optimized energy consumption, avoiding unnecessary energy waste while ensuring complete blockade.
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 effectively blocks nerve communication without causing discomfort or long-term tissue damage, offering a reversible and energy-efficient method for modulating neural activity, suitable for various therapeutic applications.
Implementation Method 1
The stimulation activates the action potentials on the nerve fibers, but the frequency of the stimulation blocks or inhibits communication from the presynaptic terminal to the postsynaptic membrane
Implementation Method 2
An electrical signal may be applied to at least some nerve fibers at a stimulation intensity that exceeds the stimulation threshold for at least some of the nerve fibers within a nerve to quickly deplete neurotransmitters from a presynaptic terminal
Data Source
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Figure 5A~5B
AI summary
An example of a system may include a depletion block neural stimulator and a depletion block controller. The depletion block neural stimulator may be configured to deliver a depletion block stimulation to a nerve. The depletion block stimulation may include a series of pulses at a pulse frequency within a range between about 100 Hz to about 1000 Hz. The depletion block controller may be configured to communicate with the depletion block neural stimulator and control the depletion block stimulation. The depletion block controller may be configured to receive a start depletion block signal and respond to the received start depletion block signal by initiating the delivery of the depletion block stimulation to the nerve, and the depletion block controller may be configured to receive a stop depletion block signal and respond to the received stop depletion block signal by terminating the delivery of the depletion block stimulation to the nerve.