Biometric Sensor Strap with Elastic Framework and Air Cushions
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Solution Overview
Problem
Existing biometric signal acquisition devices face challenges in maintaining stable contact with varying body shapes and sizes, leading to issues like light leakage and motion artifacts, and cause skin irritation due to inadequate adherence and pressure distribution.
Innovation Solution
A body-attachable biometric signal acquisition device featuring a framework with elastic restoring moment generating portions and air cushions to ensure consistent contact and pressure, using a strap system with adjustable fasteners and materials that reduce skin irritation and accommodate body size variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is allowed to firmly adhere to the skin by tightening body fixing means such as a strap, then close adherence of the sensor to the skin is improved, but delicate skin may become congested with blood which is problematic
Solution Approach 1:
The strap is designed with different local properties: a rigid portion (bone-shaped portion) that provides structural support and pressure distribution, and a flexible fabric portion that contacts the skin directly. This local differentiation allows the rigid part to maintain adherence reliability while the flexible fabric part prevents skin congestion by conforming to body contours and distributing pressure evenly.
Solution Approach 2:
The bone-shaped portion is pre-formed with a specific curved geometry that matches the body contour before use. This preliminary shaping ensures that when the strap is applied, the pressure is automatically distributed along the curved path, preventing localized congestion while maintaining consistent sensor contact with the skin.
2Object-affected harmful factors
If a strap is formed of a soft material such as a fabric to reduce skin irritation, then skin health is improved, but it is difficult to generate an elastic restoring moment and thus the strap needs to be firmly tightened which is disadvantageous
Solution Approach 1:
The strap merges two previously separate components into one integrated structure: the rigid bone-shaped portion (which generates elastic restoring moment) and the soft fabric portion (which prevents skin irritation). This combination allows the device to simultaneously achieve reliable sensor adherence through the rigid portion's elastic properties and skin comfort through the fabric portion's softness.
Solution Approach 2:
The strap uses a composite structure combining rigid material (for the bone-shaped portion) and flexible fabric material (for the strap body). This composite approach leverages the advantages of both materials: the rigid portion provides structural integrity and elastic restoring force, while the fabric portion provides skin-friendly contact and flexibility.
3Ease of operation
If Velcro is attached to a soft silicone material or the like, then ease of fastening is improved, but it is difficult to attach Velcro to the silicone material
Solution Approach 1:
Instead of attaching Velcro directly to the silicone material (which is difficult), the invention inverts the approach by attaching the Velcro to the fabric portion of the strap, which is then integrated with the bone-shaped portion. This reversal of the attachment sequence and location solves the manufacturing difficulty while maintaining ease of fastening.
4Object-affected harmful factors
If a gap is formed between the strap and the body when elastic restoring moment is generated, then skin health is improved, but wobbling of the terminal device may occur
Solution Approach 1:
The strap is segmented into distinct functional portions: the bone-shaped rigid portion that maintains device stability and prevents wobbling, and the fabric portion that can accommodate gaps for skin health. This segmentation allows each portion to independently fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the strap have different contact characteristics with the body: the bone-shaped portion maintains stable contact to prevent wobbling, while the fabric portion allows for gaps to form, preventing skin congestion. This local differentiation of contact quality resolves the contradiction between stability and skin health.
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 device achieves stable biometric signal acquisition by maintaining close adherence to the body, reducing skin irritation, and preventing wobbling, while allowing for easy adjustment to accommodate varying body sizes and shapes, thus enhancing measurement reliability and comfort.
Implementation Method 1
a pressure applied by the sensor to the surface of the body is generated by an elastic restoring moment generated by the framework
Data Source
AI summary
Provided is a body-attachable biometric signal acquisition device. The body-attachable biometric signal acquisition device includes: a main body including a sensor acquiring a biometric signal in a state of closely adhering to a surface of a body; and a first fixing portion winding the body to fix the main body to the body, wherein the first fixing portion includes a first strap winding the body, the first strap includes a framework formed of an elastic material, and when the first strap winds the body to fasten the main body and the first fixing portion to the body, a pressure applied by the sensor to the surface of the body is generated by an elastic restoring moment generated by the framework, and a gap is present between a portion of an outer surface of the first strap, and the surface of the body, the portion being positioned between the framework and the surface of the body. An air cushion is provided to prevent wobbling of the main body caused by an excessive space formed due to body size variation.