Cuff Pressure Sensing Pad Layout Without Kink-Prone Fluid Tubes
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Solution Overview
Problem
Existing pressure measuring devices suffer from kinks in fluid tubes, mechanical noise, and air bubbles that adversely affect pressure measurement accuracy, particularly in determining physiological parameters like blood pressure.
Innovation Solution
A pressure measuring device with a pressure transducer attached to a shell, eliminating the need for a fluid tube, and incorporating a fluid-filled pressure sensing pad and a kinking-proof shell to directly transmit pressure signals, ensuring accurate and reliable measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fluid tube is used to transmit pressure from the pressure sensing pad to the pressure transducer, then the pressure sensing device can be separated from the transducer, but the tube may kink, introduce mechanical noise, or contain air bubbles that adversely affect measurement accuracy
Solution Approach 1:
The patent removes the fluid tube from the system entirely by integrating the pressure transducer directly to the shell at the pressure sensing location. This extraction of the problematic tube component eliminates kinks, mechanical noise, and air bubble issues while maintaining the ability to separate the pressure sensing pad from the transducer through the shell structure.
Solution Approach 2:
The pressure transducer is merged with the shell structure, forming an integrated assembly where the transducer is attached directly to the shell at the pressure sensing area. This merging eliminates the need for a separate fluid tube connection while maintaining functional separation of the pressure sensing pad and transducer components.
2Measurement precision
If the pressure transducer is attached to the shell, then fluid tubes and related problems are eliminated, but the transducer must be precisely positioned to avoid protruding into the subject's body part
Solution Approach 1:
The patent creates a localized recess or opening in the shell specifically positioned to accommodate the pressure transducer. This local structural modification ensures the transducer is precisely positioned within the shell thickness without protruding into the subject's body part, while maintaining direct attachment to the shell for accurate pressure sensing.
3Stability of the object's composition
If the shell is made rigid to prevent kinking, then structural stability is improved, but the shell may create pressure marks on the subject's skin
Solution Approach 1:
The patent employs a shell that combines rigid structural elements to prevent kinking with flexible or compliant surfaces that contact the subject's body part. This allows the shell to maintain its kink-resistant structural integrity while the flexible outer surface conforms to the body part shape and reduces pressure marks through even pressure distribution.
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 solution provides improved pressure measurement by eliminating tube-related issues, reducing mechanical noise and air bubbles, and enhancing measurement accuracy, particularly for determining physiological parameters like blood pressure.
Implementation Method 1
a pressure transducer for measuring the sensed pressure signal, wherein the pressure transducer is attached to the shell
Implementation Method 2
the pressure sensing device comprises a fluid-filled pressure sensing pad located in the pressure sensing area for sensing the pressure signal
Data Source
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AI summary
The invention relates to a pressure measuring device configured to surround a subject's body part. It comprises a pressure application element configured to apply pressure to the body part, a pressure sensing device configured to measure a pressure signal of the body part and a shell 4 which is arranged to be located between the pressure application element and the body part. The pressure sensing device comprises a fluid-filled pressure sensing pad 61 arranged on the inside of the shell for sensing the pressure signal and a pressure transducer 69 for measuring the sensed pressure signal, wherein the pressure transducer is attached to the shell. This configuration allows for an improved pressure measurement.