Pressure Flow Symptom Scoring for Clearer LUTS Obstruction Assessment
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Solution Overview
Problem
Current pressure flow studies (PFS) for lower urinary tract symptoms (LUTS) lack a comprehensive diagnostic metric beyond maximum pressure and flow rate, failing to differentiate between detrusor and abdominal contractions, leading to ambiguous obstruction assessments.
Innovation Solution
A symptom score derivation methodology that combines multiple sub-scores, including flow rate efficiency, voided urine volume, flow pattern, pressure pattern, and abdominal straining, to provide a more nuanced diagnostic assessment by integrating various PFS parameters and relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional PFS metrics (maximum pressure and flow rate only) are used, then the assessment is simple, but the diagnostic precision is insufficient and cannot differentiate between detrusor and abdominal contractions
Solution Approach 1:
The patent segments the overall symptom assessment into multiple distinct sub-scores: flow rate efficiency sub-score, voided urine volume sub-score, flow pattern sub-score, pressure pattern sub-score, and abdominal straining sub-score. Each sub-score evaluates a specific aspect of bladder function independently, allowing for precise differentiation between detrusor contraction effectiveness and abdominal straining contributions, thereby resolving the technical contradiction between diagnostic precision and assessment complexity.
2Loss of information
If multiple PFS parameters are integrated into a composite score, then the diagnostic information becomes more comprehensive, but the interpretation complexity increases
Solution Approach 1:
The patent merges multiple PFS parameters (flow rate, voided volume, flow pattern characteristics, pressure pattern characteristics, and abdominal straining indicators) into a single composite symptom score through a weighted averaging process. This integration preserves all relevant diagnostic information while consolidating it into one interpretable metric, directly addressing the contradiction between information completeness and interpretation ease by providing both detailed breakdown and synthesized overview.
3Reliability
If a composite symptom score with multiple sub-scores is derived, then the diagnostic clarity is enhanced, but the calculation complexity increases
Solution Approach 1:
The patent transforms complex PFS parameters into standardized sub-scores through defined calculation relationships and normalization processes. Each raw parameter (e.g., maximum flow rate, voided volume, pressure measurements) is converted into a dimensionless sub-score component that can be systematically combined. This parameter transformation approach enhances diagnostic reliability by ensuring consistent evaluation while managing calculation complexity through systematic processing.
Data Source
AI summary
A method of assessing pressure flow study data is provided. The method is characterized by obtaining a select weighted average composite of select derived symptom sub-scores via use of a urodynamic system characterized by, in operative combination, a processor, memory and symptom score software executable by the processor, the urodynamic system receiving input from at least pressure and urine flow sensing devices. A flow rate efficiency sub-score is derived, along with a voided urine volume sub-score, a post void residual sub-score, a flow pattern sub-score and a pressure pattern sub-score.