Grip-Type Pulse Wave Sensor with Spheroid Body and Thumb Stopper
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Solution Overview
Problem
Existing pulse wave measuring devices face limitations in stability and usability due to the need for unnatural finger placement and restricted use locations.
Innovation Solution
A grip-type pulse wave measuring device with a spheroid-shaped main body, a stopper to restrict thumb position, and a recessed pulse wave sensor area, allowing natural one-handed grip and stable pulse wave acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If non-slip rubber is stuck on the bottom surface to prevent slipping, then the main body portion does not slip and move, but the place of use is limited to desks or similar surfaces
Solution Approach 1:
The main body portion is designed with a substantially spheroid shape, which eliminates the need for a flat bottom surface with non-slip rubber. The curved, grippable form allows the device to be held stably in the hand without requiring placement on a specific surface, thereby resolving the contradiction between stability and versatility of use location.
2Ease of operation
If the pulse wave detector is positioned near the center and the user grips with four fingers, then the device can be held, but an unnatural movement is forced and stable long-term measurement is difficult
Solution Approach 1:
The pulse wave detector is positioned at an off-center location on the main body portion, specifically arranged to be contacted by the thumb when naturally gripped. This local repositioning allows the thumb to naturally rest on the sensor area, creating a comfortable and stable gripping posture that enables reliable long-term measurement without forcing unnatural hand movements.
3Measurement precision
If the main body portion is fixed to prevent movement during finger insertion, then measurement can be performed, but the device cannot be used portably
Solution Approach 1:
The substantially spheroid shape of the main body portion provides ergonomic grip stability in the hand, replacing the need for fixed positioning on surfaces. This curved form factor enables portable use while maintaining measurement precision through natural hand stabilization.
Solution Approach 2:
The device design allows the user's hand to naturally stabilize the device during measurement through the ergonomic spheroid shape and strategically positioned sensor. The gripping action itself provides the stability needed for accurate measurement, eliminating the need for external fixing mechanisms and enabling portability.
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 stable and natural acquisition of pulse waves without place restrictions, reducing user fatigue and improving measurement consistency.
Implementation Method 1
a pulse wave sensor disposed at a position offset from the stopper portion along a peripheral direction of the main body portion and to acquire a pulse wave signal from a fingertip of the thumb
Data Source
AI summary
A grip-type pulse wave measuring device includes a main body that has a substantially spheroid shape, and a stopper that projects along an axial direction of the main body and abuts against a side surface of a thumb to restrict a position of the thumb when a user grips the main body portion. Moreover, a light shielding cover is provided that is formed into a substantially semi-cylindrical shape and is mounted so as to be swingable about, as a swing shaft, a shaft that is provided in parallel to the axial direction of the main body. A photoplethysmographic sensor is disposed at a position offset from the swing shaft of the light shielding cover along a peripheral direction of the main body and is configured to acquire a photoplethysmographic signal.