Cylindrical Drum Cuff for Variable Arm Circumference
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Solution Overview
Problem
Existing automated blood pressure cuffs with fixed circumference designs are limited in their ability to accommodate users with varying arm sizes, leading to inaccurate and inconsistent measurements due to variability in air volume and pressure points, and often fail to support proper postural positioning as recommended by the American Heart Association, making it difficult for these devices to meet new FDA accuracy guidelines.
Innovation Solution
A blood pressure device featuring a cylindrical drum cuff housing with a direct drive assembly, a flexible lead band material, and a knuckle support assembly that tilts, slides, and rotates, allowing for adjustable postural positioning and accurate arm circumference measurement, along with a bladder and pump system for inflation, providing a more ergonomic and consistent measurement experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed circumference automatic cuff design is used, then the device structure is simple, but it cannot accommodate users with varying arm sizes leading to inaccurate measurements
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed circumference cuff with a flexible lead band material that can dynamically adjust to different arm circumferences. The flexible band allows the cuff to adapt its shape and size to accommodate various arm dimensions while maintaining consistent measurement pressure, thereby resolving the contradiction between measurement precision and adaptability to varying arm sizes.
Solution Approach 2:
The patent employs parameter changes by modifying the cuff structure from a rigid fixed circumference design to a flexible variable circumference design. The flexible lead band material changes its dimensional parameters to match the user's arm circumference, enabling accurate measurements across different arm sizes while maintaining the simplicity of the overall device structure.
2Measurement precision
If the bladder inflates until it pins the arm, then the blood pressure measurement can be obtained, but the process leads to inaccurate and inconsistent results due to variability in air volume and pressure points
Solution Approach 1:
The patent applies feedback by incorporating a sensor associated with the flexible lead band material that provides real-time information about cuff positioning and arm circumference. This feedback mechanism allows the system to adjust the inflation process dynamically, ensuring consistent pressure application and measurement accuracy while reducing variability in air volume requirements.
Solution Approach 2:
The patent replaces the traditional mechanical inflation system that relies on fixed pressure points with a more sophisticated control system that uses sensor feedback. This substitution allows for more precise control of the inflation process, maintaining measurement consistency while managing the increased complexity through automated control mechanisms.
3Ease of operation
If a fixed metal or plastic housing is used, then the device structure is stable, but it does not allow a wide range of users to achieve proper postural positioning
Solution Approach 1:
The patent applies dynamics by replacing the fixed metal or plastic housing with a knuckle support assembly that can tilt, slide, and rotate. This dynamic support structure adapts to different user positions and arm lengths, allowing a wide range of users to achieve proper postural positioning while maintaining overall device stability through controlled movement capabilities.
Solution Approach 2:
The patent employs segmentation by dividing the support structure into multiple movable components (tilting mechanism, sliding mechanism, rotating joint) rather than a single rigid housing. This segmentation allows each component to adjust independently to accommodate different user needs, improving ease of operation while managing complexity through modular design.
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 device achieves higher accuracy and consistency in blood pressure measurements by accommodating a range of arm sizes and allowing for optimal postural positioning, meeting the American Heart Association's recommendations and new FDA guidelines, while providing a comfortable and reliable user experience.
Implementation Method 1
a pump having a source of pressurized air to inflate the pump
Data Source
AI summary
A blood pressure device having a cylindrical drum cuff housing adapted to measure the circumference of either a right or left arm and administer a blood pressure test. The drum cuff housing is connected to a knuckle support assembly adapted to provide freedom of movement for postural positioning before and during the blood pressure test.