Electronic Sphygmomanometer Cuff Wrapping Control
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Solution Overview
Problem
Fully-automatic arm sphygmomanometers face measurement accuracy issues due to improper cuff wrapping, leading to incorrect pressure pulse wave detection and potential false pulse waves, caused by the curler's radial expansion or contraction affecting the measurement air bladder's pressurization.
Innovation Solution
An electronic sphygmomanometer with a control unit that adjusts the pressure of both the measurement air bladder and the wrapping mechanism to maintain a predetermined ratio, using a first fluid bladder, a wrapping unit, and a second fluid bladder, ensuring proper cuff wrapping and accurate blood pressure measurement through controlled inflation and deflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wrapping air bladder is inflated to wrap the measurement air bladder around the measurement area, then the cuff wrapping is achieved, but the curler expands or contracts radially causing false pulse waves and measurement errors
Solution Approach 1:
A compression air bladder is introduced as an intermediary component between the wrapping air bladder and the measurement air bladder. The compression air bladder applies radial compression to the measurement air bladder, stabilizing it against the measurement area and preventing false pulse waves caused by curler expansion or contraction during wrapping.
Solution Approach 2:
The system controls the internal pressure of the compression air bladder to maintain a predetermined ratio with the internal pressure of the measurement air bladder. By dynamically adjusting the compression pressure parameter, the system ensures stable cuff wrapping without causing measurement errors from excessive compression or curler deformation.
2Reliability
If the measurement air bladder pressure is increased to ensure proper artery compression, then measurement reliability improves, but the curler may expand outward preventing proper pressurization
Solution Approach 1:
The compression air bladder serves as a mediator that allows the measurement air bladder to maintain high pressure for reliable artery compression while preventing the curler from expanding outward. The compression air bladder applies counteracting radial force to stabilize the measurement air bladder shape.
Solution Approach 2:
The system dynamically adjusts the compression air bladder pressure to maintain a predetermined ratio with the measurement air bladder pressure. This parameter control ensures that the measurement air bladder can achieve sufficient pressure for reliable measurement without causing curler expansion.
3Manufacturing precision
If the wrapping mechanism pressure is increased to stabilize the cuff, then wrapping accuracy improves, but it may cause the measurement air bladder to contract inward affecting measurement
Solution Approach 1:
The compression air bladder acts as an intermediary that receives compression force from the wrapping mechanism and transmits controlled compression to the measurement air bladder. This prevents excessive wrapping pressure from directly contracting the measurement air bladder while still achieving stable cuff wrapping.
Solution Approach 2:
The system controls the compression air bladder pressure to maintain a predetermined ratio with the measurement air bladder pressure, ensuring that wrapping precision is achieved without excessive compression that would affect measurement accuracy.
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
Improves measurement accuracy by ensuring the cuff is properly wrapped around the measurement area, stabilizing the curler and preventing false pulse waves, thus enhancing the reliability of blood pressure readings.
Implementation Method 1
a measurement air bladder that to carry out blood pressure measurement compresses an artery in a measurement area, detects a change in the volume of the artery occurring as the pressure is gradually increased or decreased
Implementation Method 2
by inflating the wrapping air bladder, the diameter of the curler is reduced, thus wrapping the measurement air bladder around the measurement area
Implementation Method 3
a sensor for detecting an internal pressure of the first fluid bladder
Data Source
AI summary
A CPU of a sphygmomanometer includes a first control unit that, during measurement, controls a change in the internal pressure of a measurement air bladder by controlling the driving of a pump and/or a valve. The CPU further includes a second control unit that controls a change in the internal pressure of a compressing air bladder by controlling the driving of a pump and/or a valve. During measurement, the second control unit carries out control so that the internal pressure of the compressing air bladder is a predetermined ratio to the internal pressure of the measurement air bladder controlled by the first control unit.