Tubular Blood Pressure Cuff for Stable Pressure Readings
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Solution Overview
Problem
Existing blood pressure cuffs designed as flat sheets that encircle and tighten around extremities often result in improper pressure readings due to being too tight or too loose, leading to instability in measurements.
Innovation Solution
A tubular-shaped blood pressure cuff with an elastomeric inflatable bladder and a rigid housing, featuring angled segments and stabilizers, which securely fits onto the extremity without encircling, ensuring consistent pressure and accurate measurements by providing a radially inward push force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat sheet cuff is used to encircle and tighten around the extremity, then the cuff can be applied to the extremity, but the pressure readings become improper and unstable due to being too tight or too loose
Solution Approach 1:
The cuff transitions from a flat sheet design to a tubular shape that conforms to the cylindrical geometry of the extremity. This curvature allows the cuff to wrap smoothly around the extremity without creating tight constrictions or loose gaps, thereby stabilizing pressure readings while maintaining ease of application.
Solution Approach 2:
The cuff incorporates a flexible inflatable bladder made of elastomeric material that can deform to match the extremity's contours. This flexibility enables the cuff to adapt to different extremity sizes and shapes, ensuring proper contact and stable pressure measurements without requiring tight tightening.
2Stability of the object's composition
If the cuff is tightened to fit securely, then the cuff stabilizes on the extremity, but the pressure readings become improper due to excessive tightness
Solution Approach 1:
The tubular geometry of the cuff allows it to conform to the extremity's shape, providing stability through geometric fit rather than excessive tightening. The curved structure naturally follows the extremity's contours, maintaining secure placement without creating compressive forces that would skew pressure readings.
Solution Approach 2:
The cuff utilizes the elastomeric properties of the inflatable bladder to change its physical state between inflated and deflated conditions. When deflated, the bladder maintains the tubular shape for stable positioning; when inflated, it provides controlled pressure for measurement, separating the functions of stability and pressure application.
3Ease of operation
If the cuff is made loose to avoid excessive pressure, then the extremity can be easily fitted, but the pressure readings become unstable due to insufficient contact
Solution Approach 1:
The tubular shape of the cuff is designed to naturally conform to the extremity's cylindrical form, providing adequate contact and measurement stability without requiring tight tightening. The curved geometry ensures continuous contact along the extremity surface, maintaining stable pressure readings while allowing easy fitting.
Solution Approach 2:
The flexible inflatable bladder made of elastomeric material can deform to match the extremity's contours, ensuring proper contact for stable measurements. This flexibility allows the cuff to maintain consistent contact pressure without requiring excessive tightness, thereby stabilizing readings while facilitating easy application.
4Device complexity
If a traditional flat cuff design is used, then the structure is simple, but the pressure distribution is improper leading to measurement errors
Solution Approach 1:
The cuff incorporates a tubular structure with curved geometry that distributes pressure more evenly around the extremity. This curved design improves pressure distribution compared to flat cuffs, reducing measurement errors while adding only minimal structural complexity through the use of a standard cylindrical geometry.
Solution Approach 2:
The inflatable bladder is constructed from flexible elastomeric material that can deform to conform to the extremity's shape. This flexibility allows the cuff to adapt to the extremity's contours, improving pressure distribution and measurement accuracy without requiring complex structural elements.
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 tubular design ensures snug and secure fitting, stabilizes pressure fluctuations, and maintains consistent contact with the extremity for accurate blood pressure monitoring, transforming arterial pressure waveforms into central arterial pressure.
Implementation Method 1
a photoplethysmograph. The photoplethysmograph can be utilized to measure parameters of the artery, such as the arterial diameter
Implementation Method 2
An arterial pressure sensor can include an inflatable cuff that inflates to a pressure on the artery to be measured
Data Source
AI summary
Systems and devices for performing hemodynamic measurements are provided. A blood pressure cuff can have a fixed tubular shape. The blood pressure cuff can include an inflatable bladder and a housing with an inflation chamber formed in between the inflatable bladder and housing. The blood pressure cuff is configured to fit onto an extremity of an individual. The inflatable bladder can include angled segments to help secure the blood pressure cuff to the extremity.