Forearm Blood Pressure Cuff Geometry for Obese Patient Accuracy
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Solution Overview
Problem
Conventional non-invasive blood pressure monitoring systems face challenges in accurately measuring blood pressure in obese patients due to the large upper arm circumference and subcutaneous adipose tissue, which can lead to inaccurate readings and errors in blood pressure estimation.
Innovation Solution
A pressure cuff designed for the forearm with specific cuff bladder dimensions of 9.2+/−2.1 centimeters in width and 24.6+/−4.2 centimeters in length, providing a width ratio range of 0.25 to 0.34 and length ratio range of 0.66 to 0.91, optimized for precise non-invasive blood pressure measurements in patients with forearm circumferences ranging from 27 to 37 centimeters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional upper arm pressure cuffs are sized proportionally to patient's upper arm circumference, then the pressure cuff can accommodate larger arm sizes, but the cuff width becomes so large that it extends beyond the patient's elbow, reducing measurement accuracy
Solution Approach 1:
The invention segments the upper arm measurement problem by introducing a forearm-specific cuff with optimized dimensions. Instead of scaling up the conventional upper arm cuff proportionally, the patent creates a dedicated forearm cuff design that avoids the geometric distortion and measurement errors that occur when conventional cuffs are simply enlarged for larger patients.
Solution Approach 2:
The invention applies local quality by optimizing the cuff bladder dimensions specifically for the forearm anatomy. The cuff bladder width of 9.2+/−2.1 cm and length of 24.6+/−4.2 cm are specifically tailored to the forearm's dimensional characteristics, ensuring proper fit and measurement accuracy for this specific body部位 rather than using a universal upper arm design.
2Ease of operation
If conventional pressure cuffs are applied to obese patients' upper arms, then the cuff can be secured to the limb, but subcutaneous adipose tissue interferes with NIBP measurements, introducing error
Solution Approach 1:
The invention extracts the measurement site from the upper arm to the forearm, removing the patient from the problematic anatomical location. By applying the cuff to the forearm instead of the upper arm, the patent eliminates the interference from subcutaneous adipose tissue that plagues upper arm measurements in obese patients, while still enabling blood pressure monitoring.
3Area of stationary object
If pressure cuff bladder dimensions are increased to accommodate larger circumferences, then the cuff can fit larger patients, but the cuff extends beyond the patient's elbow, diminishing measurement accuracy
Solution Approach 1:
The invention changes the dimensional approach by creating a forearm-specific cuff with optimized width and length ratios rather than simply scaling up the conventional upper arm cuff. The specific dimensions (width: 9.2+/−2.1 cm, length: 24.6+/−4.2 cm) are designed to fit the forearm's geometry, providing adequate coverage without extending beyond the elbow, thus maintaining measurement precision while accommodating the necessary cuff area.
Data Source
AI summary
A pressure cuff is disclosed herein. The pressure cuff includes a sleeve and a cuff bladder. The cuff bladder defines a bladder length of 9.2+/−2.1 centimeters and a bladder width of 24.6+/−4.2 centimeters. The bladder length and bladder width dimensions provide precise non-invasive blood pressure measurements when the pressure cuff is applied to a forearm having a circumference in the range of 27 to 37 centimeters.