CSF Drainage Implant with Segmented Modular Design
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Solution Overview
Problem
Existing devices for treating excess fluid in cranial spaces suffer from high failure rates due to challenging surgical procedures, fluid flow issues, blockages, infections, bleeding risks, and inadequate drainage, with difficulties in placing catheters correctly and potential air embolism.
Innovation Solution
A combined implant system comprising a subarachnoid space implant, dural venous sinus implant, and connector implant, affixed to the cranium, allowing safe access and drainage of cerebrospinal fluid into the venous system with minimal brain penetration, featuring a low profile design and modular components for easy maintenance and testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional catheter systems are used to drain CSF, then drainage function is achieved, but surgical complexity and risk increase due to challenging surgical procedures and difficult catheter placement
Solution Approach 1:
The device is divided into separate functional elements: a first element for accessing the subarachnoid space, a second element for accessing the venous system, and a third connecting element. This segmentation allows each component to be optimized independently and simplifies the surgical procedure by providing modular, pre-configured access points rather than requiring complex catheter placement.
Solution Approach 2:
The third connecting element acts as an intermediary between the first and second elements, providing a pre-established fluid pathway. This intermediary component eliminates the need for complex surgical catheter placement by offering a ready-made connection that reduces surgical complexity while maintaining drainage reliability.
2Productivity
If catheters are placed to drain CSF, then fluid removal is achieved, but blockages and clots occur periodically
Solution Approach 1:
The device incorporates local quality variations in the connecting element design, including angled transitions and specific curvature radii that prevent clot formation. The material properties and geometric features are locally optimized to maintain open flow pathways while adapting to the specific requirements of each component interface.
Solution Approach 2:
The connecting element introduces angular dimensions and three-dimensional transitions between the first and second elements, creating multiple flow pathways and reducing the likelihood of complete blockage. This dimensional complexity in the fluid pathway design prevents periodic clots while maintaining effective drainage.
3Reliability
If catheters are inserted into cranial space, then CSF drainage is achieved, but bleeding and air embolism risks increase
Solution Approach 1:
The device is designed with pre-configured access elements that establish safe pathways before fluid drainage begins. The first and second elements are pre-positioned to access the subarachnoid space and venous system through controlled openings, eliminating the need for high-risk catheter insertion while maintaining drainage safety and preventing bleeding and air embolism.
Solution Approach 2:
The third connecting element serves as a protected intermediary pathway that transfers CSF from the subarachnoid space to the venous system through a controlled, pre-established route. This intermediary design isolates the surgical risk from the drainage function, maintaining safety while enabling effective fluid removal.
4Productivity
If catheters are placed in SAS or ventricles, then CSF drainage is achieved, but placement precision is difficult
Solution Approach 1:
The device segments the drainage system into distinct elements with predefined access locations. The first element provides a fixed access point to the subarachnoid space, and the second element provides a fixed access point to the venous system. This segmentation transforms the precision challenge into a matter of accurate but simple opening placement, improving overall placement precision.
Solution Approach 2:
The device uses standardized access element designs that can be replicated at precise locations. The first and second elements are designed as reproducible components with consistent geometries, allowing for accurate placement at predetermined positions in the subarachnoid space and venous system, thereby improving placement precision without compromising drainage effectiveness.
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 reduces surgical complications, minimizes bleeding and air embolism risks, and ensures effective drainage of cerebrospinal fluid, making it safer and more accessible than traditional methods, particularly suitable for young subjects.
Implementation Method 1
a third connecting element located between, and connected to, the first and second elements that: 1) allows CSF fluid to flow between the first and second elements
Data Source
AI summary
An implant system is provided for drainage of cerebrospinal fluid (CSF) via a CSF containing space of a subject to a dural venous sinus (DVS) of the subject without penetration of gray matter of a brain of the subject. The implant system includes a first element for providing access to the CSF located in the CSF containing space, a second element for providing access to the DVS, and a third connecting element fluidly coupled to the first element and to the second elements and arranged to carry the CSF from the first element to the second element.