Finger Assist Tool with Size Adjustment Plate for Capillary Refill Time
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Solution Overview
Problem
Existing assist tools for measuring capillary refill time struggle to maintain constant pressure on biological tissues, especially when the finger size deviates significantly from the tool's size, leading to measurement errors and inefficiencies.
Innovation Solution
The assist tool includes a support body, a bag body with a fluid passage, and a size adjustment plate that can be accommodated within the support body, allowing for adjustable finger accommodation and ensuring consistent pressure application regardless of finger thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed-size assist tool is used, then the structure is simple and easy to manufacture, but the measurement precision deteriorates when finger size deviates from the tool size
Solution Approach 1:
The assist tool incorporates a size adjustment plate that can be moved between multiple positions (first position for thin fingers, second position for thick fingers) to dynamically adjust the internal space of the tool. This allows the same tool structure to adapt to different finger sizes, maintaining appropriate pressure application and measurement precision without requiring multiple fixed-size tools.
Solution Approach 2:
The invention changes the physical parameter of the assist tool's internal space by adjusting the position of the size adjustment plate. When the plate is in the first position, it creates a smaller internal space for thin fingers; when in the second position, it creates a larger internal space for thick fingers. This parameter adjustment ensures consistent pressure application regardless of finger size.
2Reliability
If the assist tool is designed for average finger size, then manufacturing is simplified, but the reliability of measurement deteriorates for fingers with significantly different sizes
Solution Approach 1:
Rather than manufacturing multiple fixed-size tools for different finger circumferences, the invention uses a single tool with a movable size adjustment plate. This dynamic adjustment mechanism allows one tool to serve multiple finger sizes reliably, improving measurement consistency without the complexity of producing and managing multiple tool variants.
Solution Approach 2:
The assist tool is designed to be universal by incorporating the size adjustment plate that can be positioned to accommodate both thin and thick fingers. This single tool performs the function of multiple specialized tools, ensuring reliable measurements across different finger sizes while simplifying manufacturing and inventory management.
3Measurement precision
If pressure is applied manually, then the operation is simple, but the measurement precision and reproducibility deteriorate
Solution Approach 1:
The assist tool uses the subject's own finger to apply pressure through the bag body. When the finger is inserted into the assist tool, it automatically exerts pressure on the biological tissue without requiring external manual pressure application. This self-service mechanism ensures consistent and reproducible pressure application while maintaining operational simplicity.
Data Source
AI summary
An assist tool to be attached to a finger of a subject. The assist tool includes a support body configured to be placed on a first side of the finger in a case where the support body is attached to the finger, a bag body configured to be placed on a second side of the finger, the second side being opposite to the first side with respect to the finger, a fluid passage communicating with inside of the bag body, and a size adjustment plate configured to be placed on one side, to which the finger is to be attached, in the support body. In a case where the size adjustment plate is accommodated in the support body, a finger accommodating space on a finger side of the bag body is thinned.