Integrated Digit Sensor for Simultaneous Blood Pressure and Light Absorption
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Solution Overview
Problem
Existing methods for simultaneously measuring blood light absorber concentration and non-invasive blood pressure are cumbersome due to the need for cables and tubes to be drawn from separate body locations, causing botheration for both the subject and medical personnel.
Innovation Solution
A sensor configuration where a probe for acquiring blood light absorber concentration is attached to a first digit and a cuff for acquiring non-invasive blood pressure is attached to a second digit on the periphery, allowing cables and tubes to be drawn from a single digit, thus reducing clutter and maintaining pulsation-based measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the probe and cuff are attached to separate body locations (fingertip and upper arm), then the cable and tube can be drawn out from different places, but this causes botheration for both the subject and medical personnel
Solution Approach 1:
The patent combines the probe and cuff into a single integrated sensor unit that attaches to the same digit. This merging eliminates the need for separate attachment locations and allows both the cable and tube to be drawn out from the same place, reducing botheration while maintaining measurement functionality.
2Measurement precision
If the cuff is attached to compress the digit for blood pressure measurement, then non-invasive blood pressure can be acquired, but this may inhibit the pulsation needed for accurate blood light absorber concentration measurement
Solution Approach 1:
The patent segments the digit into two distinct attachment regions: a first portion for the probe and a second portion for the cuff. This spatial segmentation ensures that the probe remains in a region with sufficient pulsation for accurate blood light absorber concentration measurement, while the cuff compresses a different region for blood pressure measurement, thereby maintaining both measurement precisions simultaneously.
3Device complexity
If the probe and cuff are attached to the same digit, then cables and tubes can be drawn from a single location reducing clutter, but the cuff compression may affect pulsation detection
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different portions of the same digit. The first portion is optimized for optical measurement with minimal compression, while the second portion is optimized for pressure measurement with controlled compression. This localized functional differentiation allows both measurements to coexist without mutual interference.
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 reduces botheration and maintains the accuracy of blood light absorber concentration measurements by ensuring that pulsation is not inhibited, enabling continuous measurement without decreasing accuracy.
Implementation Method 1
The wavelength of the light beam which is emitted from the light emitter is set to be absorbable by a material in blood. The volume of blood in the fingertip is changed by the pulsation, and therefore also the intensity of the light beam which is received by the light-detecting surface is changed.
Data Source
AI summary
A sensor includes a probe that acquires a blood light absorber concentration in a subject and a cuff that acquires a non-invasive blood pressure of the subject. In the sensor, the probe is configured to be attached to a first portion of a digit of the subject, and the cuff is configured to be attached to a second portion of the digit, the second portion being located on a periphery side with respect to the first portion.