Wearable Biometric Sensor with Optical Shielding for Motion Accuracy
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Solution Overview
Problem
Wearable devices face challenges in accurately measuring biometric parameters like oxygenation level, heart rate, heart rate variability, blood pressure, hydration level, and blood glucose due to movement-induced shifts, which cause light to bypass body tissue and directly reach sensors, leading to inaccurate readings.
Innovation Solution
A wearable device featuring a circular, annular, or polygonal array of light emitters and receivers, with compressible opaque light barriers to prevent direct light transmission and ambient interference, allowing for accurate analysis of light reflected or transmitted through body tissue to measure biometric parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wearable device is worn on the body, then biometric parameters can be measured, but movement causes the device to shift and light to bypass body tissue, leading to measurement inaccuracies
Solution Approach 1:
The patent applies preliminary anti-action by implementing light barriers and optical shielding structures before light can bypass the tissue. The device includes opaque barriers positioned between the light source and detector that preemptively block direct light paths, preventing the harmful effect of light bypassing tissue during device movement. This proactive approach maintains measurement reliability even when the device shifts on the body.
Solution Approach 2:
The patent introduces intermediary elements in the form of light guides and optical coupling structures that mediate between the light source and detector. These intermediaries ensure that light must interact with the body tissue rather than taking a direct path, using optical waveguides or reflective surfaces to redirect light through the tissue before reaching the detector, thus maintaining measurement accuracy during motion.
2Measurement precision
If light barriers are added to prevent direct light transmission, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent employs flexible thin film light barriers and opaque coatings that can be integrated into the wearable device structure. These thin film structures provide effective light blocking while maintaining device flexibility and wearability, avoiding the need for bulky rigid shielding components. The thin films conform to the device geometry and provide sufficient optical isolation without significantly increasing device complexity.
Solution Approach 2:
The patent merges the light barrier function with existing device components such as the housing, sensor mounting structures, or structural elements. By integrating optical shielding into components that already exist for mechanical support or sensor mounting, the patent avoids adding separate dedicated light barrier components, thus improving measurement accuracy without proportionally increasing device complexity.
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 configuration enhances the accuracy of biometric parameter measurements by ensuring that only light interacting with body tissue is analyzed, reducing motion artifacts and ambient interference, thereby providing reliable data.
Implementation Method 1
Light emitted from the emitters is reflected from and/or transmitted through the person's body tissue and then received by the receivers
Data Source
AI summary
A wearable device for measuring biometric parameters includes a circular or polygonal array of sets of light emitters and light receivers. Light transmitted through body tissue is received and analyzed to measure one or more biometric parameters such as oxygenation level, heart rate, heart rate variability, blood pressure, hydration level, and/or blood glucose level. Each set of light emitters includes light emitters which emit light of different colors. This device can also include one or more compressible opaque light barriers which surround light receivers.