Implantable Stimulator Voltage Selection for Tissue Impedance Changes
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Solution Overview
Problem
Existing electrical stimulation devices face challenges in minimizing volume, extending charge periods, and reducing power consumption, especially when implanted in the human body.
Innovation Solution
The electrical stimulation device incorporates a boost circuit, a voltage selecting circuit, and a control circuit. The boost circuit generates multiple voltages, and the voltage selecting circuit automatically selects an output voltage based on a reference voltage from tissue impedance, optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electrical stimulation device uses a fixed voltage output, then the device structure is simple, but the power consumption cannot be optimized according to tissue impedance changes
Solution Approach 1:
The patent implements dynamic voltage selection by generating multiple voltages (V1, V2, V3, V4) through a boost circuit and using a voltage selecting circuit to automatically choose the appropriate voltage based on tissue impedance detected via reference voltage. This dynamic adaptation allows the device to optimize power consumption according to real-time physiological conditions while maintaining a relatively compact structure through integrated circuit design.
Solution Approach 2:
The patent changes the voltage parameter dynamically by providing multiple voltage levels (5V, 10V, 15V, 20V) and selecting among them based on tissue impedance. The voltage selecting circuit compares the reference voltage with threshold values and switches between different voltage outputs, thereby adapting the power consumption to match the actual tissue impedance conditions.
2Volume of moving object
If the device volume is reduced for implantation, then the device can be implanted in the human body, but the charge period becomes longer and power consumption increases
Solution Approach 1:
The dynamic voltage selection based on tissue impedance allows the device to operate more efficiently by matching the output voltage to the actual load conditions. This optimization extends the charge period and reduces power consumption, thereby extending the service life of the implanted device without requiring increased volume.
3Use of energy by moving object
If the output voltage is adjusted immediately according to tissue impedance changes, then power consumption is reduced, but the device complexity increases
Solution Approach 1:
The voltage selecting circuit operates automatically based on the detected reference voltage from tissue impedance. The circuit self-adjusts the output voltage without requiring external control signals or complex processing, thereby reducing power consumption while minimizing the increase in device complexity through autonomous operation.
Solution Approach 2:
The patent implements a feedback mechanism where the reference voltage from tissue impedance is continuously monitored and fed to the voltage selecting circuit. This feedback loop enables automatic voltage adjustment in response to tissue impedance changes, optimizing power consumption while maintaining a relatively simple circuit architecture through direct voltage comparison and switching.
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 solution allows for immediate adjustment of the output voltage in response to changing tissue impedance, reducing power consumption and extending the device's service life while maintaining a compact design.
Implementation Method 1
The boost circuit generates a plurality of voltages, wherein the voltages have different voltage values
Implementation Method 2
the stages of the charge pump circuits generate voltages according to the control signal and the capacitors are configured to store the respective voltages
Implementation Method 3
the voltage selecting circuit is coupled to the boost circuit and selects one of the voltages according to a reference voltage on a tissue impedance
Implementation Method 4
When the first switch is enabled, the first diode is coupled to the first electrode input end to transmit the reference voltage to the voltage selecting circuit
Data Source
AI summary
An electrical stimulation device is provided. The electrical stimulation device includes a boost circuit, a voltage selecting circuit and a control circuit. The boost circuit generates a plurality of voltages, wherein the voltages have different voltage values. The voltage selecting circuit is coupled to the boost circuit and selects one voltage according to a reference voltage on a tissue impedance to generate an output voltage. The control circuit is coupled to the boost circuit and in response to electrical stimulation; it transmits a control signal to enable the boost circuit.