Urinary Catheter Negative Pressure Control for Renal Congestion
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Solution Overview
Problem
Existing treatments for venous congestion and fluid overload in the kidneys, such as diuretics, are ineffective in managing renal congestion and fluid overload, particularly in conditions like heart failure and sepsis, leading to prerenal acute kidney injury and impaired renal function.
Innovation Solution
A system utilizing sensors to monitor pulmonary artery pressure and control a negative pressure source to a urinary catheter, applying negative pressure to remove fluid from the urinary tract based on predetermined pressure thresholds, and optionally adjusting a blood pump output to support blood circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diuretics are used to treat venous congestion and fluid overload in the kidneys, then fluid removal is attempted, but the treatment is ineffective in managing renal congestion and fluid overload, particularly in conditions like heart failure and sepsis
Solution Approach 1:
Instead of using diuretics to promote urine production from within the kidneys, this patent applies negative pressure externally to the urinary tract to mechanically draw fluid out. The approach inverts the conventional method by creating a pressure gradient that pulls fluid through the urinary catheter rather than relying on renal function to produce and expel urine naturally.
Solution Approach 2:
The patent introduces a urinary catheter as an intermediary device between the urinary tract and the negative pressure source. This mediator allows direct access to the urinary tract to apply negative pressure and remove fluid, bypassing the ineffective diuretic pathway through congested renal systems.
2Object-generated harmful factors
If negative pressure is applied to the urinary tract to remove fluid, then renal congestion is reduced, but uncontrolled negative pressure may cause tissue damage or discomfort
Solution Approach 1:
The system continuously monitors pressure within the urinary tract and compares it to predetermined threshold values. When the pressure exceeds the threshold, the controller activates the negative pressure source; when pressure returns to normal, the system stops or reduces negative pressure application. This closed-loop feedback mechanism prevents excessive negative pressure that could cause tissue damage.
Solution Approach 2:
The negative pressure application is made dynamic rather than static. The system adjusts the magnitude and duration of negative pressure based on real-time pressure measurements and patient response, allowing optimization of fluid removal while minimizing potential harm from prolonged or excessive pressure application.
3Productivity
If continuous negative pressure is applied to maximize fluid removal, then productivity of fluid removal increases, but energy consumption and potential for harm increase
Solution Approach 1:
Instead of continuous negative pressure application, the system uses periodic or intermittent negative pressure cycles based on pressure threshold triggers. The negative pressure source is activated only when pressure exceeds predetermined thresholds and deactivated when thresholds are met, creating a rhythmic pattern of fluid removal that conserves energy while maintaining effectiveness.
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
Effectively manages renal congestion by enhancing fluid removal and supporting blood circulation, potentially improving renal function and reducing the risk of prerenal acute kidney injury.
Implementation Method 1
provide a control signal, determined at least in part from the pulmonary artery pressure signal(s) received from the at least one sensor, to a negative pressure source to apply negative pressure to a urinary catheter to remove fluid from a urinary tract
Implementation Method 2
at least one sensor configured to detect signal(s) representative of pulmonary artery pressure
Data Source
AI summary
A system for removing fluid from a urinary tract includes at least one sensor configured to detect signal(s) representative of pulmonary artery pressure and communicate signal(s) representative of the pulmonary artery pressure and a controller. The controller is configured to: receive and process the signal(s) from the at least one sensor to determine if the pulmonary artery pressure is above, below, or at a predetermined value; and provide a control signal, determined at least in part from the pulmonary artery pressure signal(s) received from the at least one sensor, to a negative pressure source to apply negative pressure to a urinary catheter to remove fluid from a urinary tract when the pulmonary artery pressure is above the predetermined value and to cease applying negative pressure when the pulmonary artery pressure is at or below the predetermined value.