Finger-Clipped Oximeter Elastic Plate Design
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Solution Overview
Problem
Finger-clipped oximeters with coil springs face assembly challenges, fatigue fractures, unreliable connections, and user discomfort due to non-parallel movements, affecting measurement accuracy and longevity.
Innovation Solution
A finger-clipped oximeter design featuring a simplified elastic finger pressed plate made of silica gel, using V-shaped springs or magnets for measurement force application, with U-shaped connecting rods and magnetic pairs to eliminate thickness influence and enhance comfort and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coil spring is used to connect upper case and lower case, then clamping pressure is applied to finger, but assembly is difficult and fatigue fracture occurs reducing useful life
Solution Approach 1:
The patent removes the coil spring from the connection structure between upper case and lower case. Instead, a rigid connection structure with positioning protrusions and recesses is used to directly connect the upper and lower cases, eliminating the elastic component that suffers from fatigue fracture while maintaining the necessary clamping function through the overall device geometry.
Solution Approach 2:
The connection structure is divided into modular components with specific positioning features. The upper case has positioning protrusions and the lower case has corresponding positioning recesses, creating segmented but precisely fitted connections that are both strong and easy to assemble.
2Ease of operation
If pivot and coil spring connection is used, then upper and lower cases can rotate relatively, but connection is neither firm nor reliable and cases may separate
Solution Approach 1:
The patent employs asymmetric positioning protrusions and recesses that allow controlled relative movement during assembly while preventing separation during use. The asymmetric geometry ensures unidirectional locking that maintains firm connection reliability.
Solution Approach 2:
The positioning protrusions of one case nest into the positioning recesses of the other case, creating an interlocked structure where components are nested together to form a reliable unified connection that prevents separation.
3Ease of operation
If pivot and coil spring connection is used, then upper and lower cases move in non-parallel directions, but user comfort is poor
Solution Approach 1:
The patent creates a dynamic connection system where the rigid cases can still accommodate finger thickness variations through elastic deformation of the finger pressed plate and flexible positioning, rather than relying on complex non-parallel mechanical movements.
4Measurement precision
If conventional lower case structure is used, then measurement is possible, but thickness of finger influences measurement result
Solution Approach 1:
The patent changes the physical state and properties of the lower case by using silica gel material with specific elastic characteristics. This allows the lower case to dynamically adjust its shape and pressure distribution according to finger thickness, maintaining measurement precision across different finger sizes.
Solution Approach 2:
The finger pressed plate is made of silica gel with specific local elastic properties that allow it to conform to different finger shapes and thicknesses. This localized material property enables adaptability to various finger sizes while maintaining consistent measurement quality.
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 design improves user comfort, measurement accuracy, and device longevity by providing a stable, easy-to-assemble oximeter suitable for various finger sizes, with a non-contacting force mechanism that reduces mechanical failures and accommodates finger shape, ensuring effective and accurate measurements.
Implementation Method 1
a lower case which is simplified as a structure of an elastic finger pressed plate
Implementation Method 2
a finger pressed plate of which applies a measurement force to the finger by peculiar V-shaped springs
Implementation Method 3
V-shaped springs or magnets for measurement force application, and U-shaped connecting rods and magnetic pairs
Data Source
AI summary
A finger-clipped oximeter includes an upper case (2) in which a measuring element (4), a data processing circuit, batteries (6) and a display (3) are provided, a rectangular through hole being provided in the upper case (2); a finger pressed plate (10) in which a measuring element is also provided, a finger inserting hole (11), a rectangular column (7) with a position corresponding to that of the rectangular through hole of the upper case (2); and a pair of connectors which are capable of ascending or descending, each of the connectors including one U-shaped connecting rod (8).