Air-Lock-Free Catheter Drainage With Real-Time Fluid Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Foley catheters suffer from residual urine due to air locks, leading to inaccurate urine output measurements and skewed intra-abdominal pressure readings, with existing solutions being imprecise and repetitive.
Innovation Solution
A device with lumens that maintain a siphon effect and incorporate a pumping mechanism to prevent obstruction, combined with line-clearing mechanisms using vacuum, pulsatile energy, and sensors to automate urine measurement and analysis, including oxygen tension and specific gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional Foley catheter with central lumen is used, then the device structure is simple and easy to manufacture, but air locks form in the drainage tube causing large residual volume and inaccurate urine output measurement
Solution Approach 1:
The single central lumen is divided into multiple separate lumens (first lumen for urine drainage, second lumen for air venting). This segmentation allows urine and air to be drained through different pathways, preventing air lock formation and improving measurement accuracy while maintaining reasonable structural complexity
Solution Approach 2:
A third lumen is introduced as an intermediary element to detect air lock conditions. This sensing lumen monitors the drainage system for air lock presence and triggers the pump mechanism, enabling automated detection and response without significantly increasing overall device complexity
2Productivity
If manual manipulation of drainage tube is performed to clear air locks, then device structure remains simple, but the process is repetitive, imprecise, and time-consuming
Solution Approach 1:
The system performs self-service through automated detection and clearing mechanisms. The third lumen automatically detects air locks, and the pump mechanism automatically activates to clear them, eliminating the need for repetitive manual manipulation and significantly improving drainage efficiency
Solution Approach 2:
A feedback loop is established where the third lumen continuously monitors for air lock conditions and provides feedback to control the pump mechanism. When air lock is detected, the pump activates to clear it, creating an automated closed-loop system that improves productivity without requiring manual intervention
3Measurement precision
If air locks are present in the drainage tube, then residual volume increases, but air locks also skew intra-abdominal pressure readings
Solution Approach 1:
Air is extracted from the drainage system through the dedicated second lumen that provides a separate air venting pathway. By removing air locks through this dedicated channel, both residual urine volume and pressure measurement accuracy are improved, as air locks no longer block the drainage path or interfere with pressure sensing
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
Enhances urine drainage accuracy, prevents air locks, and provides precise intra-abdominal pressure measurements by maintaining an open flow path and incorporating sensors for real-time monitoring and analysis.
Implementation Method 1
lumens that maintain a siphon effect
Implementation Method 2
line-clearing mechanisms using vacuum
Implementation Method 3
line-clearing mechanisms using vacuum, pulsatile energy
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A device for draining bodily fluids is described herein which generally may comprise an elongate body defining one or more lumens configured to receive a bodily fluid from a cavity, e.g., bladder, of a patient body. The one or more lumens are in fluid communication with a reservoir which may receive the bodily fluid. A pumping mechanism may be used to urge the bodily fluid through the one or more lumens, where the pumping mechanism is configured to maintain an open space within the one or more lumens such that outflow of the bodily fluid through the one or more lumens remains unobstructed such that a negative pressure buildup in the cavity is inhibited. The device may also include a vent or valve mechanism in communication with the elongate body to allow air to enter or exit the one or more lumens.