Dual-Lumen CSF Access Port for CNS Drug Delivery and Sampling
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Solution Overview
Problem
Existing medical devices face challenges in delivering therapeutic agents to the central nervous system (CNS) due to the blood-brain-barrier, achieving adequate spatial and temporal exposure, and monitoring therapeutic agent concentrations in the brain, with issues in catheter design and implantation causing patient discomfort and limited functionality.
Innovation Solution
A medical system with a first implantable access and infusion port having separate fluid pathways for introducing and withdrawing fluid from a CSF-containing space, and a second port for convenient access, allowing for separate catheters to withdraw CSF and introduce therapeutic agents, with optional implantation near the ear or clavicle, and a port catheter connecting both ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single catheter with one lumen is used for both delivering therapeutic agents and withdrawing CSF, then device complexity is reduced, but measurement precision of therapeutic agent concentrations in CSF deteriorates due to contamination from the lumen
Solution Approach 1:
The catheter is divided into multiple independent lumens within a single catheter body. The first lumen is dedicated to delivering therapeutic agents while the second lumen is dedicated to withdrawing CSF for sampling. This segmentation prevents cross-contamination between delivery and sampling pathways, ensuring accurate measurement of therapeutic agent concentrations in CSF without requiring separate catheters.
2Device complexity
If CSF is withdrawn through the same lumen used for delivering therapeutic agents, then device complexity is reduced, but reliability of continuous therapy deteriorates due to required interruptions in delivery
Solution Approach 1:
The catheter incorporates separate lumens for delivery and withdrawal functions, allowing simultaneous operation without interruption. The first lumen maintains continuous therapeutic agent delivery while the second lumen enables CSF sampling without disrupting the delivery flow, ensuring uninterrupted therapy.
Solution Approach 2:
The multi-lumen catheter structure acts as an intermediary solution that reconciles the conflicting requirements of continuous delivery and sampling. By providing dedicated pathways for each function, the catheter enables both operations to occur concurrently without interference, maintaining therapy reliability.
3Ease of operation
If therapeutic agents are systemically administered to achieve CNS therapeutic levels, then ease of administration is improved, but harmful factors increase due to undesirably high systemic concentrations and metabolites
Solution Approach 1:
The system extracts the therapeutic agent delivery directly into the CNS via the ventricular system, bypassing the systemic circulation. By delivering agents directly into the CSF through the catheter, the therapy achieves high CNS concentrations without requiring high systemic doses, thereby avoiding the harmful effects of elevated systemic concentrations and metabolites.
Solution Approach 2:
The CSF-containing space and catheter system serve as an intermediary pathway for delivering therapeutic agents directly to the CNS. This intermediary route allows selective delivery to the target site (brain) while avoiding widespread systemic distribution, reducing exposure of non-target tissues to high concentrations of the agent and its metabolites.
4Adaptability or versatility
If devices are implanted under the scalp with multiple catheters or multi-lumen catheters, then functionality for separate delivery and withdrawal is improved, but device complexity and surgical difficulty increase due to secure connection requirements
Solution Approach 1:
Multiple lumens are integrated within a single catheter body, which then connects to a single access port implantable under the scalp. This merging approach provides the functionality of separate delivery and withdrawal pathways while simplifying the implantation procedure compared to using multiple separate catheters, reducing surgical complexity and improving secure connection reliability.
Data Source
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AI summary
A system includes a first port (100) comprising a first inlet (150), a first outlet (132), and a first fluid pathway extending between them, a second inlet (140), a second outlet (134), and a second fluid pathway extending between them. The system further includes at least one CSF catheter having a first and a second lumen. The CSF catheter is coupled with the first port (100) such that the first lumen is in fluid communication with the first fluid pathway and the second lumen with the second fluid pathway. At least a first distal opening of the first lumen is placed in the CSF-containing space. The system further includes a second port (500) having a third inlet, a third outlet and a third fluid pathway extending between them. The system also includes a port catheter (600) configured to operatively couple the third fluid pathway to the second fluid pathway.