Permeable Support Catheter for Negative-Pressure Urine Drainage
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Solution Overview
Problem
Existing devices are inadequate in effectively removing urine from the urinary tract, particularly in conditions of fluid retention and venous congestion, leading to impaired renal function and conditions like prerenal Acute Kidney Injury (AKI) and chronic kidney disease.
Innovation Solution
A fluid collection catheter with a permeable tissue support is deployed in the urinary tract to maintain the catheter's position and induce negative pressure, facilitating urine drainage through a drainage lumen, using a permeable tissue support to maintain the catheter's position and enhance urine excretion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drainage catheters are used, then the device structure is simple, but urine removal effectiveness is insufficient under fluid retention and venous congestion conditions
Solution Approach 1:
The catheter is divided into multiple functional segments: an elongated tube for drainage, a permeable tissue support for structural maintenance and negative pressure induction, and a drainage lumen for urine collection. This segmentation allows each component to perform its specific function optimally, improving overall urine removal effectiveness while keeping individual components relatively simple.
Solution Approach 2:
The patent combines multiple functions into a single integrated catheter device: urine drainage, negative pressure generation, and tissue support are merged into one device. This integration improves productivity by eliminating the need for multiple separate devices while the unified structure manages complexity through functional consolidation.
2Productivity
If negative pressure is applied to increase urine output, then renal hemodynamics improve, but the risk of tissue damage or catheter displacement increases
Solution Approach 1:
The permeable tissue support acts as an intermediary between the negative pressure source and the surrounding tissues. It distributes the negative pressure forces evenly across the tissue interface, preventing localized stress concentrations that could cause tissue damage or catheter displacement, while still allowing sufficient negative pressure to be transmitted to increase urine output.
Solution Approach 2:
The permeable tissue support functions as a flexible membrane that conforms to the surrounding tissue geometry. This flexibility allows it to maintain stable contact with tissues under varying pressure conditions, ensuring catheter position stability while transmitting the necessary negative pressure gradient to improve urine production.
3Productivity
If a permeable tissue support is added to maintain catheter position and induce negative pressure, then urine drainage effectiveness improves, but device complexity increases
Solution Approach 1:
The permeable tissue support performs multiple functions simultaneously: it maintains catheter position by providing structural support, induces negative pressure to enhance urine drainage, and allows fluid permeability for physiological compatibility. This multi-functionality improves urine drainage effectiveness while minimizing the need for additional separate components, thereby controlling overall device complexity.
4Ease of manufacture
If the catheter structure is simplified for ease of manufacture, then production cost decreases, but the ability to maintain negative pressure and position stability deteriorates
Solution Approach 1:
The permeable tissue support is constructed from porous materials that can be manufactured using relatively simple processes while maintaining their permeability characteristics. The porous structure allows the material to be produced cost-effectively through techniques like sintering or foam formation, while still providing the necessary mechanical properties for position stability and negative pressure maintenance.
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
The solution increases urine output, reduces sodium and water re-absorption, improves renal hemodynamics, and alleviates venous congestion, potentially preventing or reducing AKI and chronic kidney disease progression.
Implementation Method 1
a permeable tissue support directly or indirectly connected to and extending axially and/or radially from the elongated tube... configured to be deployed in the urinary tract to maintain the distal end of the elongated tube at a predetermined position
Implementation Method 2
inducing a negative pressure through the at least one drainage lumen of the elongated tube to draw urine from the urinary tract into the drainage lumen
Implementation Method 3
the permeable tissue support defines a three-dimensional shape of sufficient size to permit flow of at least a portion of fluid from the urinary tract through the permeable tissue support and drainage portion of the sidewall to the at least one drainage lumen
Data Source
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AI summary
A catheter includes an elongated tube having a distal portion having a distal end and a sidewall defining at least one drainage lumen. The sidewall includes a drainage portion which allows fluid to pass through the sidewall and into the drainage lumen. The catheter also includes a permeable tissue support. The tissue support is configured to be deployed in the urinary tract to maintain the distal end of the elongated tube at a predetermined position in a bladder, a ureter, a renal pelvis, or a kidney of the patient. When deployed, the permeable tissue support defines a three-dimensional shape of sufficient size to permit flow of at least a portion of fluid from the urinary tract through the tissue support and drainage portion of the elongated tube to the at least one drainage lumen.