Implantable Drainage Chamber with Mechanical Overfill Limiting
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Solution Overview
Problem
Existing bodily fluid drainage systems face challenges in minimizing the volume taken up by volume limiting mechanisms and require continuous monitoring to prevent overfilling, which can lead to malfunction and limited adjustable volume capacity.
Innovation Solution
An implantable drainage system with a mechanical volume limiting mechanism using a rack-and-pinion mechanism and an adjustable volume capacity mechanism via a coil spring, allowing for automatic overfill prevention and adjustable collection chamber volume without susceptibility to fluid immersion, along with a gravity shutoff valve for additional safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buoyant float member is used for volume limiting, then overfill prevention is achieved, but the float member occupies significant volume within the collection chamber reducing fluid collection capacity
Solution Approach 1:
The collection chamber is divided into two separate chambers: an inner collection chamber for fluid collection and an outer collection chamber that houses the volume limiting mechanism. This segmentation allows the volume limiting mechanism to occupy space in the outer chamber while the inner chamber maintains maximum fluid collection capacity without being compromised by the presence of the float or limiting mechanism.
Solution Approach 2:
The inner collection chamber is nested within the outer collection chamber, creating a compact dual-chamber structure. The volume limiting mechanism is positioned in the outer chamber while the inner chamber floats within it, allowing efficient space utilization where the limiting mechanism does not encroach on the fluid collection volume of the inner chamber.
2Reliability
If continuous visual monitoring is implemented to prevent overfilling, then overfill prevention is achieved, but medical staff time and resources are significantly consumed
Solution Approach 1:
The drainage system implements self-service overfill prevention through an automatic volume limiting mechanism. The floating inner collection chamber is constrained by the outer chamber structure, which automatically prevents overfilling when the inner chamber reaches a predetermined volume. This eliminates the need for continuous manual monitoring by medical staff, as the system self-regulates fluid collection volume.
Solution Approach 2:
The floating inner collection chamber provides visual feedback about fluid volume through its position and displacement within the outer chamber. As fluid accumulates, the inner chamber rises, providing immediate visual indication of the volume level. This automatic visual feedback mechanism eliminates the need for continuous manual monitoring while maintaining reliable overfill prevention.
3Reliability
If the collection chamber volume is fixed to accommodate the volume limiting mechanism, then overfill prevention is reliable, but the volume capacity cannot be adjusted for different patient needs
Solution Approach 1:
The drainage system implements dynamic adjustability by allowing the inner collection chamber to float at different height positions within the outer collection chamber. The volume limiting mechanism can be adjusted to constrain the inner chamber at different levels, enabling customization of the fluid collection volume capacity to match different patient needs while maintaining reliable overfill prevention through the floating constraint mechanism.
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 system effectively reduces the workload on medical staff by automatically preventing overfilling and allowing adjustable volume capacity, enhancing safety and reducing the risk of malfunction due to fluid exposure, while maintaining efficient fluid collection and flow control.
Implementation Method 1
an adjustable volume capacity mechanism via a coil spring
Implementation Method 2
a gravity shutoff valve for additional safety
Implementation Method 3
A pinion gear at the opposite end engages with a rack gear mounted to the inner surface of the inner collection chamber to raise the stopper head upwards
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
An implantable bodily fluid drainage system including a collection vessel 10 and a mechanical volume limiting mechanism 100, 105 for preventing overfill of the collection chamber. The mechanical volume limiting mechanism is not susceptible to malfunction if immersed in the bodily fluid. Moreover, the volume capacity of the fluid collection chamber is adjustable in addition to the overfill prevention functionality.