Dual-Lumen Intraventricular Access for Brain Infusion and CSF Sampling
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Solution Overview
Problem
Existing methods for administering drugs directly to the brain, such as Ommaya reservoirs and external ventricular drains, are limited in their ability to provide continuous and effective drug delivery and sampling of cerebrospinal fluid, often leading to complications like infection and inadequate drug penetration due to the blood-brain barrier.
Innovation Solution
An intraventricular access device with a dual lumen design, including an aspiration and infusion system, that minimizes cross-contamination by using separate lumens and barriers to prevent needle penetration, allowing for continuous drug infusion and sampling through a port beneath the scalp, connected to either an implantable or external pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lumen is used for both aspiration and infusion, then device complexity is reduced, but cross-contamination between sampling and drug delivery pathways occurs
Solution Approach 1:
The catheter is divided into separate aspiration and infusion lumens, with the infusion lumen positioned within the aspiration lumen. This segmentation allows independent operation of sampling and drug delivery pathways, preventing cross-contamination while maintaining a unified catheter structure.
Solution Approach 2:
The infusion lumen is nested within the aspiration lumen, creating a concentric dual-lumen configuration. This nesting arrangement provides physical separation of pathways while maintaining a compact overall structure, effectively preventing contamination between the two functions.
2Ease of operation
If the infusion lumen is accessible from the outside, then ease of operation is improved, but the risk of needle penetration and contamination increases
Solution Approach 1:
A barrier is positioned at the proximal end of the infusion lumen to preemptively prevent needle penetration. This barrier is designed to block accidental or intentional penetration of the infusion lumen during sampling operations, thereby preventing contamination before it can occur.
Solution Approach 2:
The barrier acts as an intermediary protective element between the external environment and the infusion lumen. It allows the infusion lumen to remain accessible for operation while providing a protective interface that prevents direct needle penetration into the luminal space.
3Productivity
If the catheter tip is positioned close to the blood-brain barrier, then drug delivery effectiveness is improved, but the risk of infection and complications increases
Solution Approach 1:
The catheter tip is positioned with its opening facing away from the blood-brain barrier, creating a localized configuration that facilitates drug delivery to the ventricular space while minimizing direct contact with potential infection sources. The directional orientation of the tip serves the dual purpose of efficient drug delivery and infection prevention.
Data Source
AI summary
In some embodiments, a device may include an intraventricular access device and an infusion device. The intraventricular access device may include more than one catheter and a container. In some embodiments, the catheter may include an aspiration lumen and an infusion lumen. A distal end of the intraventricular portion of the catheter may be positionable, during use, in a subject's brain fluid. In some embodiments, the container may be coupled to a proximal end of the aspiration lumen. The proximal end of the aspiration lumen may be in fluid communication with the container. The proximal end of the infusion lumen may be in communication with an infusion pump. In some embodiments, the device inhibits cross contamination between a first fluid in the aspiration lumen and a second fluid in the infusion lumen. In some embodiments, the container may include a barrier positioned between a proximal opening of the aspiration lumen and at least a portion of the infusion lumen adjacent to and/or associated with the container. The barrier may inhibit penetration of a surgical instrument.