Blood Pressure Monitor Cuff Inflation Analysis

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Solution Overview

Problem

Existing blood pressure measurement methods using standard cuffs face accuracy issues due to variations in upper arm circumference, leading to inaccuracies in systolic and diastolic readings.

Innovation Solution

A method that determines the upper arm circumference by analyzing the inflation behavior of the cuff, using the integral of electrical pump power at a predetermined pressure increase rate, and adjusts the blood pressure calculation algorithm accordingly to improve measurement accuracy across different arm sizes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a standard cuff is used for blood pressure measurement, then the device complexity is reduced and ease of operation is improved, but measurement precision deteriorates due to variations in upper arm circumference

Engineering Contradiction:

Improveblood pressure measurement accuracyVSAvoidcuff size classification system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The blood pressure monitoring device automatically determines the upper arm circumference by analyzing the inflation curve characteristics during cuff inflation, eliminating the need for manual measurement and selection. The device self-adjusts the calibration parameters based on the detected arm size, allowing a single cuff to adapt to different arm circumferences and improving measurement accuracy without increasing device complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention changes the calibration parameters dynamically based on the detected upper arm circumference. By analyzing the inflation curve (particularly the pressure increase rate), the system identifies the appropriate calibration set and adjusts the blood pressure calculation algorithm accordingly, enabling accurate measurements across different arm sizes with a single cuff

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If multiple cuff sizes are provided for different arm circumferences, then measurement precision is improved, but device complexity and ease of operation worsen due to selection requirements

Engineering Contradiction:

Improveblood pressure measurement accuracyVSAvoidcuff selection process

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The device automatically detects the upper arm circumference by analyzing the inflation curve characteristics and selects the appropriate calibration parameters without user intervention. This eliminates the need for users to manually measure their arm or select the correct cuff size, making the device equally easy to use for all users while maintaining high measurement accuracy

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

A single cuff design is made universal by equipping it with an integrated sensor that can detect arm circumference and automatically adjust calibration. This allows one cuff to serve multiple functions: both as a pressure application device and as a measurement device for determining the appropriate calibration settings

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If a single cuff is used for all users, then device complexity and ease of operation are improved, but measurement precision deteriorates without adaptive calibration

Engineering Contradiction:

Improvecuff system simplicityVSAvoidblood pressure accuracy for different arm sizes

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The invention replaces the mechanical approach of using multiple physical cuffs with different sizes with an electronic/sensor-based system. A single pressure sensor measures the inflation curve characteristics to detect arm circumference and automatically selects the appropriate calibration, substituting physical variety with electronic adaptability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The inflation curve analysis serves as an intermediary that links the single cuff to the appropriate calibration parameters. By measuring the pressure increase rate during inflation, the system indirectly determines arm circumference and uses this information to select the correct calibration, acting as a bridge between a universal cuff and size-specific accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4085825B1Blood pressure measuring method with upper arm cuff

Publication Date: 2024.12.04 BEURER

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AI summary

A blood pressure measurement method on an upper arm, comprising the following steps: - Providing a blood pressure monitor with a cuff; - Applying the cuff around a patient's upper arm; - Inflating the cuff and during inflation; - Determining the inflation behavior of the cuff by recording at least one of the following parameters: pressure change per unit of time (mmHg/s) during inflation, cuff pressure after a predetermined inflation time, inflation time required to reach a predetermined cuff pressure;Integral of the electrical pump power at a predetermined cuff pressure rise rate - Determination of the patient's upper arm circumference from the cuff inflation behavior, wherein the cuff inflation behavior is stored as information and the stored information is compared with previously stored information of the same type by this blood pressure monitor and this cuff, if available, and assigned to a person from a group of persons in case of identity or predetermined similarity.