Sphygmomanometer Dynamic Scale Sliding for Pressure Resolution
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Solution Overview
Problem
Conventional sphygmomanometers with electronic graph displays have a coarse resolution for blood pressure measurement due to a fixed scale from 0 mmHg to 300 mmHg, limiting the accuracy of pressure indication on a display screen.
Innovation Solution
A sphygmomanometer with a display control unit that slides the scale indication along the display screen at a predetermined or measured pressure change rate, allowing the pressure mark to remain within a frame, improving the resolution by focusing on a 100 mmHg range within the 0 mmHg to 300 mmHg scale, mimicking the appearance of a traditional mercury column sphygmomanometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the entire range of the scale from 0 mmHg to 300 mmHg is fixed and displayed on the indicator, then the display screen size can be kept small, but the resolution of indication becomes coarse (1 mmHg or 2 mmHg)
Solution Approach 1:
The patent applies the dynamics principle by making the scale indication movable rather than fixed. The scale indication slides along the longitudinal direction of the display screen based on the current cuff pressure value, allowing the display to dynamically adjust its range. This enables the system to maintain a small display screen size while achieving fine resolution by focusing on a 100 mmHg range at a time rather than attempting to display the entire 0-300 mmHg range simultaneously.
2Measurement precision
If the scale indication is made movable to improve resolution, then the resolution of indication improves, but the device complexity increases due to the need for slide control
Solution Approach 1:
The patent applies the self-service principle by designing the scale indication to automatically slide and position itself based on the current cuff pressure value without requiring manual intervention. The display control unit automatically calculates the appropriate position and slides the scale indication to maintain optimal visualization, making the system self-adjusting and reducing operational complexity despite the enhanced functionality.
3Ease of operation
If the scale indication slides at a speed matching the pressure change rate, then the mark remains within the frame for better readability, but the control system becomes more complex
Solution Approach 1:
The patent applies the feedback principle by making the slide speed of the scale indication dependent on the actual pressure change rate. The display control unit continuously monitors the pressure change rate and adjusts the slide speed accordingly, creating a feedback loop that optimizes readability. This ensures the mark remains within the frame during pressure changes while using information already available in the measurement system.
Data Source
AI summary
A sphygmomanometer includes a frame that spatially demarcates a region in which a display screen is displayed. On the display screen, a scale indication for making a value of pressure readable is displayed along one direction. On the display screen, a mark that represents a pressure of a cuff by a position of the mark with respect to the scale indication is displayed. When the pressure changes, a display control unit performs control to slide the scale indication with respect to the frame along the one direction at a slide speed corresponding to a predetermined pressure change rate or a pressure change rate obtained by actual measurement in a pressurizing process or a depressurizing process of the cuff so that the mark falls within the frame.