Multicapacitor Sensor Array for Electrical Sensory Feedback
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Solution Overview
Problem
Individuals with amputations or neuropathy, such as those with diabetes, face challenges in regaining sensation in affected body parts, leading to difficulties in balance and increased risk of ulcers due to reduced sensory feedback.
Innovation Solution
A sensor array with capacitive elements and an electrode matrix provides real-time electrical feedback through axial and shear force sensing, temperature monitoring, and adjustable stimulation signals, allowing users to experience sensations and potentially stimulate new cell growth, integrated with a smartphone for data logging and user-variable settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor array with capacitive elements is used to sense forces and temperature, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system divides the sensing function into multiple discrete capacitive elements arranged in an array, with each element independently sensing forces and temperature at specific locations. This segmentation enables precise spatial mapping of sensory information while maintaining manageable complexity through modular architecture
Solution Approach 2:
The capacitive elements serve multiple functions: sensing axial forces, shear forces, and temperature simultaneously. The electrode matrix also performs dual functions of delivering electrical stimulation and receiving sensory feedback, reducing overall system complexity despite enhanced measurement capabilities
2Loss of information
If electrical stimulation signals are delivered through the electrode matrix, then sensory feedback is improved, but use of energy increases
Solution Approach 1:
The electrical stimulation signals are delivered in periodic pulses rather than continuous waves, allowing the system to provide adequate sensory feedback while significantly reducing average power consumption. The pulse timing and duration are optimized to trigger neural responses without sustained energy input
Solution Approach 2:
The stimulation signal parameters (amplitude, frequency, duration) are dynamically adjusted based on the sensed force and temperature levels, providing enhanced feedback when needed while conserving energy during normal conditions. This dynamic adaptation optimizes the balance between feedback quality and energy consumption
3Ease of operation
If the electrode matrix is placed on the user's skin or sub-lingually, then ease of operation is improved, but reliability of sensation transmission decreases due to skin resistance
Solution Approach 1:
The system dynamically adjusts electrical signal parameters (voltage, current, frequency) to compensate for variations in skin resistance. The controller monitors transmission quality and modifies stimulation parameters in real-time to maintain reliable sensation transmission despite changes in skin conductivity
Solution Approach 2:
The system incorporates feedback mechanisms where the controller receives information about signal transmission effectiveness and adjusts subsequent stimulation signals accordingly. This closed-loop control ensures consistent sensation delivery despite variable skin resistance conditions
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
Enables users to regain sensory awareness, improve balance, and prevent ulcers by providing accurate feedback on forces and temperatures, promoting neural adaptation and early detection of potential issues.
Implementation Method 1
A sensor array, in contact with a user's body part or prosthetic substitute for a user's body part, includes an array of capacitive elements, each element being operative to sense axial and shear forces applied to that element
Implementation Method 2
An electrode matrix, adapted for external placement in an area on a user of the sensor array, includes an array of electrodes in physical correspondence to the array of capacitive sensing elements of the sensor array
Data Source
AI summary
Electrical feedback is provided to a user who cannot receive full sensation from a body part due to amputation, neuropathy or other condition. A sensor array includes an array of capacitive force-sensing elements operative to sense axial and shear forces applied to that element. Temperature may also be sensed at each force-sensor location. An electrode matrix, adapted for external placement in an area on a user of the sensor array, includes an array of electrodes in physical correspondence to the array of capacitive sensing elements of the sensor array. An electronic controller is configured to receive electrical signals representative of the axial and shear forces applied to the sensor array and drive the electrode matrix with electrical stimulation signals corresponding to the electrical signals received from the sensor array, thereby enabling the user to experience force and/or temperature sensations experienced by the body part through the electrode matrix.