Urine Output Feedback Control for Safe Diuretic Fluid Removal
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Solution Overview
Problem
Patients with conditions like acute decompensated heart failure and acute kidney injury face unpredictable responses to diuretic treatments, leading to prolonged hospital stays or vital organ damage due to insufficient or excessive urine production, necessitating a need for precise diuretic dosing and fluid management.
Innovation Solution
A method involving diuretic administration, real-time urine output monitoring, and controlled infusion of hydration fluid to maintain intravascular volume within safe limits, using a fluid management device like the RenalGuard® system to adjust diuretic dosage and infusion rates based on urine output feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conservative (low) diuretic dosage is prescribed, then the risk of hypotension and vital organ damage is reduced, but the treatment duration is prolonged and the patient may be unable to produce sufficient urine
Solution Approach 1:
The patent applies dynamics by transitioning from a static conservative dosage approach to a dynamic dosing strategy. The system continuously monitors urine output and adjusts diuretic dosage in real-time, allowing the treatment to adapt its intensity based on patient response. This enables rapid fluid removal when safe, while automatically reducing dosage to prevent hypotension, thus resolving the contradiction between treatment speed and safety.
Solution Approach 2:
The patent implements feedback control by continuously measuring urine output and using this information to adjust diuretic dosage. The system compares actual urine production against target goals and modifies the dosage accordingly, creating a closed-loop control system. This feedback mechanism allows the treatment to achieve rapid fluid removal when urine output is adequate, while preventing oversreatment, thereby resolving the time-safety contradiction.
2Productivity
If a high diuretic dosage is administered, then fluid removal speed is increased, but the risk of hypotension and vital organ damage increases
Solution Approach 1:
The patent uses feedback control to monitor urine output in real-time and adjust diuretic dosage accordingly. The system compares actual urine production against safety thresholds and target goals, automatically reducing dosage when signs of hypotension or excessive fluid removal appear. This closed-loop feedback enables high fluid removal rates when safe, while preventing harmful effects through continuous monitoring and adaptive dosing.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting diuretic dosage based on real-time patient parameters such as urine output, blood pressure, and fluid balance. The system modifies dosage parameters continuously to optimize fluid removal while maintaining safety margins. This dynamic parameter adjustment allows the system to achieve high productivity when patient conditions permit, while automatically reducing intensity to prevent harmful effects.
3Reliability
If diuretic dosage is increased to achieve desired urine output, then fluid balance is improved, but the patient's clinical state may worsen due to slow application
Solution Approach 1:
The patent applies dynamics by implementing real-time dosage adjustment based on patient response. The system transitions from static conservative dosing to dynamic adaptive dosing, where the diuretic dosage is continuously modified based on urine output measurements and patient condition. This enables rapid achievement of fluid balance when patient conditions allow, while automatically adjusting to prevent worsening of clinical state, thus resolving the time-reliability contradiction.
Solution Approach 2:
The patent implements feedback control by continuously monitoring urine output and patient clinical status, using this information to adjust diuretic dosage in real-time. The system compares actual progress against target fluid balance goals and modifies dosage accordingly, creating an adaptive treatment protocol. This feedback mechanism enables faster achievement of fluid balance while maintaining patient safety, resolving the contradiction between treatment speed and clinical stability.
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
This approach enables rapid and safe reduction of fluid levels by ensuring intravascular volume remains below risk thresholds while promoting urine production, minimizing hospital stays and preventing hypotension or organ damage.
Implementation Method 1
The body removes excess liquid primarily by generating urine. Artificially promoting urine production by administration of a diuretic is a well-known and standard practice for reducing fluid levels in a patient.
Implementation Method 2
monitoring urine output by the patient; infusing a hydration liquid into the patient; determining a net rate of liquid removal from the patient based on a difference between the urine output and the infusion of the hydration liquid
Implementation Method 3
maintaining the intravascular volume in the range to allow extravascular fluid in the body to move into the vasculature and be removed by the kidneys generating urine
Data Source
AI summary
A method to treat patients suffering from fluid overload including: administrating a diuretic to the patient to increase urine output of the patient; monitoring intravascular volume of the patient; and maintaining the patient in a condition in which the intravascular volume is below a baseline intravascular volume and above a hemodynamic level by adjusting the administered diuretic.