Annular Bacterial Filter Prevents Air Lock in Implantable Infusion Pumps
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Solution Overview
Problem
Implantable infusion devices face challenges with air lock formation due to gas bubbles, particularly in negative or neutral pressure systems, where the low pressure makes it difficult for fluid to pass through bacterial filters, leading to blockages and inefficient medication delivery.
Innovation Solution
An internal bacterial filter is positioned between the reservoir and the pump, extending at least 180 degrees, allowing fluid to pass regardless of orientation and inhibiting air lock by providing an alternate path, even in the presence of gas bubbles, and can be composed of multiple filter elements arranged in an annular or semi-annular shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bacterial filter is positioned between the reservoir and pump in a negative or neutral pressure infusion device, then the device can filter fluid medication, but gas bubbles can cause air lock that blocks fluid flow through the filter
Solution Approach 1:
The bacterial filter is divided into multiple filter elements arranged in an annular array, creating multiple parallel flow paths. This segmentation allows fluid to bypass gas bubbles that may block individual filter elements, preventing complete air lock while maintaining filtration functionality.
Solution Approach 2:
The filter elements are arranged in an annular configuration extending circumferentially around the reservoir outlet. This dimensional arrangement creates multiple angular pathways for fluid flow, allowing the system to maintain flow reliability regardless of device orientation or gas bubble position.
2Adaptability or versatility
If the infusion device operates in negative or neutral pressure mode, then the reservoir is not continuously pressurized, but fluid must be drawn through the filter which becomes difficult when gas bubbles are present
Solution Approach 1:
Multiple filter elements create parallel flow channels that reduce resistance to fluid flow. This segmentation enables easier priming and operation in negative pressure mode by providing multiple pathways for fluid to overcome gas bubble blockages without requiring high positive pressure.
Solution Approach 2:
The annular filter array acts as an intermediary structure between the reservoir and pump, facilitating smooth fluid transition. The distributed filter elements mediate the pressure differential by creating gradual flow paths that reduce the effort required to prime the system in negative pressure mode.
3Device complexity
If a traditional linear filter is used, then the structure is simple, but the filter cannot provide alternate flow paths when gas bubbles block the flow path
Solution Approach 1:
The filter is segmented into multiple discrete filter elements arranged annularly, creating inherent redundancy. This segmentation provides multiple independent flow paths without significantly increasing overall structural complexity, as the elements follow the natural curvature of the reservoir.
Solution Approach 2:
The filter transitions from a linear one-dimensional arrangement to an annular two-dimensional configuration. This dimensional change naturally provides alternate flow paths around the reservoir outlet, improving reliability while maintaining structural simplicity through the use of curved geometry.
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
Ensures reliable fluid flow from the reservoir to the pump, preventing air lock and ensuring consistent medication delivery across various orientations and pressures, including negative and slightly positive pressure conditions.
Implementation Method 1
A bacterial filter extends across the fluid flow path from the reservoir to the pump inlet
Implementation Method 2
The configuration of the filter allows fluid to pass from the reservoir to the pump, even in the presence of gas bubble(s)
Data Source
AI summary
An implantable infusion device for delivering a fluid medication to a patient. The infusion device has an internal bacterial filter positioned between the reservoir and the pump, configured to provide a pathway for fluid to be pulled from the reservoir to the pump, regardless of the orientation of the infusion device. The configuration of the filter provides a fluid pathway from the reservoir to the pump, even in the presence of a gas bubble.