Blood Pressure Cuff Valve and Vent for Residual Pressure Relief
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Solution Overview
Problem
Residual pressure in blood pressure measurement devices can lead to inaccurate calibration and discomfort due to incomplete deflation of the bladder, restricting limb movement and blood flow.
Innovation Solution
A blood pressure measurement device with a valve that controls inflation and deflation of the bladder and a vent that continuously releases air to equalize pressure with the environment, ensuring complete deflation and minimizing residual pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bladder is deflated after blood pressure measurement, then the limb can return to normal blood flow, but residual pressure remains in the bladder causing discomfort and restricting movement
Solution Approach 1:
The patent employs an air permeable diaphragm material in the vent structure that allows residual air to gradually escape from the bladder while maintaining structural integrity. This porous/permeable material enables continuous pressure relief without compromising the bladder's sealing function during inflation, thereby eliminating discomfort and restricting movement caused by trapped residual pressure.
Solution Approach 2:
The vent with air permeable diaphragm acts as an intermediary component between the bladder interior and exterior environment. It mediates the pressure equalization process by allowing controlled air passage during deflation while preventing air leakage during inflation, thus resolving the contradiction between maintaining pressure for measurement and relieving residual pressure for comfort.
2Ease of operation
If the bladder is completely deflated to remove residual pressure, then user comfort improves, but calibration accuracy may be affected if pressure is not maintained
Solution Approach 1:
The vent system dynamically adjusts its air permeability based on pressure differential. During inflation, the vent remains closed to maintain pressure for accurate measurement and calibration. During deflation, the air permeable diaphragm opens to allow residual pressure release, improving user comfort. This dynamic behavior resolves the contradiction between maintaining pressure for precision and releasing pressure for comfort.
Solution Approach 2:
The vent operates in periodic cycles: closed during inflation and measurement phases to maintain calibration accuracy, and open during deflation phases to relieve residual pressure for user comfort. This periodic action pattern allows the system to alternate between precision requirements and comfort requirements without compromise.
3Productivity
If a valve is used to control air flow during inflation, then inflation efficiency improves, but the valve may not completely release air during deflation leaving residual pressure
Solution Approach 1:
The patent merges the functions of the valve and vent into an integrated system. The valve provides controlled inflation with high efficiency, while the integrated vent with air permeable diaphragm ensures complete deflation by allowing residual air escape. This combination resolves the contradiction between efficient inflation control and complete deflation capability.
Solution Approach 2:
The vent provides excessive air release capability beyond what the valve alone can achieve. While the valve handles the primary inflation control, the vent ensures complete deflation by allowing any remaining residual pressure to escape, thus compensating for the valve's inability to achieve 100% deflation.
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 effectively reduces residual pressure, improving calibration accuracy and user comfort by ensuring the bladder is fully deflated, allowing for more precise measurements and unrestricted limb movement.
Implementation Method 1
the diaphragm comprises an air permeable material... operate in a first state that blocks the outlet and allows air to vent through the air permeable material
Data Source
AI summary
Embodiments are directed to a blood pressure measurement device that includes a cuff configured to wrap around a limb of a user when the cuff is worn by the user, a bladder coupled to the cuff and configured to compress the limb when inflated, and a pump operative to inflate the bladder. The blood pressure measurement device can also include a valve positioned between the bladder and the pump and configured to operate in a first state that allows air from the pump to enter the bladder and prevent air from leaving the bladder. The valve can also be configured to operate in a second state that allows air to leave the bladder. The blood pressure measurement device can also include a vent positioned between the bladder and an external environment and configured to continuously release air from the bladder.