Living Body Stimulation Device Waveform Distortion
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Solution Overview
Problem
Conventional living body stimulation devices experience waveform distortions due to the reactive properties of the body, leading to an uneven stimulation feeling.
Innovation Solution
A living body stimulation device that outputs a stimulation signal with alternating positive and negative pulse groups, where pulse width changes in a specific pattern across four terms, and includes discharge pulses to promote discharging and reduce waveform distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pulse groups are outputted to stimulate the living body, then the living body's capacitive properties distort the waveform, but the stimulation effect is maintained
Solution Approach 1:
The patent applies preliminary action by inserting discharge pulses before the main pulse groups to proactively neutralize the capacitive charge accumulated in the living body. This pre-discharge mechanism prevents waveform distortion before it occurs, ensuring both accurate sine wave formation and effective stimulation. The discharge pulses are strategically positioned to clear residual charge that would otherwise distort the upcoming pulse group waveform.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the timing and intensity of discharge pulses relative to the main pulse groups. By varying the discharge pulse parameters (amplitude, duration, interval) based on the living body's capacitive response, the system maintains accurate waveform delivery while adapting to changing physiological conditions, thus resolving the contradiction between waveform precision and stimulation effectiveness.
2Ease of operation
If pulse width is adjusted to form pseudo-sine waves, then the stimulation feeling becomes softer, but waveform distortion occurs at the peaks
Solution Approach 1:
The discharge pulses are inserted immediately before the positive and negative pulse groups to preemptively clear capacitive charge that would cause peak distortion. This preliminary discharge action ensures that when the pulse width-modulated pulse groups are delivered for soft stimulation, the capacitive effects do not distort the waveform peaks, thus maintaining both comfort and fidelity.
Solution Approach 2:
The discharge pulses act as an intermediary element between the pulse generator and the living body's capacitive properties. By introducing this intermediate discharge mechanism, the system mediates the interaction between the applied stimulation and the body's reactive characteristics, preventing distortion while preserving the soft pseudo-sine wave stimulation effect.
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 effectively suppresses waveform distortions, providing a softer and more consistent stimulation by adjusting pulse width and incorporating discharge pulses to counteract body reactance, resulting in a waveform closer to a sine wave and reduced third-order harmonic.
Implementation Method 1
a living body has capacitive properties like a capacitor, and employs the action of the living body's capacitive properties to distort pulse groups
Data Source
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Figure 2A~2B
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AI summary
Provided is a living body stimulation device capable of suppressing distortion in the waveform of a pseudo-sine wave. In a stimulation signal, a positive pulse group, which includes a plurality of pulses whose potential rises toward the plus-side, and a negative pulse group, which includes a plurality of pulses whose potential falls toward the minus-side, appear alternately at predetermined intervals. When a single period of the stimulation signal is divided into four terms consisting of first, second, third, and fourth terms: the positive pulse group appears in the first term and the second term, wherein, in the first term, the pulse width gradually widens, and in the second term, the pulse width gradually narrows in a manner that change-over-time thereof is reverse of the change-over-time of the pulse width in the first term; and the negative pulse group appears in the third term and the fourth term, wherein, in the third term, the pulse width gradually widens, and in the fourth term, the pulse width gradually narrows in a manner that change-over-time thereof is reverse of the change-over-time of the pulse width in the third term. The stimulation signal includes: a discharge pulse that is provided immediately before the positive pulse group and whose potential rises toward the plus-side; and a discharge pulse that is provided immediately before the negative pulse group and whose potential falls toward the minus-side.