Multi-Lumen Ventricular Catheter Aperture Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current shunt systems for hydrocephalus treatment face frequent blockages and obstructions at the ventricular catheter apertures due to tissue growth, debris, and other factors, leading to ineffective flushing and repair methods, necessitating frequent replacement and increasing surgical risks and costs.
Innovation Solution
A ventricular catheter with a design featuring multiple lumens at the distal end that transition into a single lumen at the proximal end, incorporating tapered apertures with enlarged openings and slit geometries that resist tissue ingrowth and facilitate easier removal, reducing the likelihood of complete occlusion and simplifying revision surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple apertures are used in the ventricular catheter to allow CSF entry, then the drainage efficiency is improved, but the risk of blockage increases due to tissue growth and debris accumulation
Solution Approach 1:
The catheter is divided into multiple independent lumens (first lumen, second lumen, third lumen) instead of a single lumen. Each lumen has its own aperture for CSF entry. This segmentation ensures that if one aperture becomes blocked, the other lumens remain functional, thereby maintaining drainage efficiency while reducing the overall blockage risk.
Solution Approach 2:
The apertures are designed with specific geometric parameters including tapered configurations and enlarged openings. These parameter changes make the apertures more resistant to tissue ingrowth and debris accumulation, thereby reducing blockage risk while maintaining adequate CSF flow through each aperture.
2Reliability
If the catheter is designed with multiple lumens and tapered apertures, then the resistance to tissue ingrowth is improved, but the device complexity increases
Solution Approach 1:
The catheter body is segmented into multiple lumens (first, second, and third lumens) that run parallel through the catheter structure. Each lumen is equipped with its own tapered aperture at the distal end. This segmentation provides redundancy and resistance to tissue ingrowth while maintaining a relatively simple overall catheter design that can be manufactured using standard techniques.
Solution Approach 2:
The apertures are designed with specific geometric parameters including tapered configurations and enlarged openings. These parameter changes make the apertures more resistant to tissue ingrowth and debris accumulation, thereby reducing blockage risk while maintaining adequate CSF flow through each aperture.
3Reliability
If flushing mechanisms are used to clear blockages, then the catheter patency is improved, but the effectiveness is reduced due to small aperture size and limited flushing liquid
Solution Approach 1:
The catheter is divided into multiple independent lumens (first lumen, second lumen, third lumen) instead of a single lumen. Each lumen has its own aperture for CSF entry. This segmentation ensures that if one aperture becomes blocked, the other lumens remain functional, thereby maintaining drainage efficiency while reducing the overall blockage risk.
Solution Approach 2:
The apertures are designed with specific geometric parameters including tapered configurations and enlarged openings. These parameter changes make the apertures more resistant to tissue ingrowth and debris accumulation, thereby reducing blockage risk while maintaining adequate CSF flow through each aperture.
4Ease of repair
If cauterization is performed to remove blocking tissue, then existing apertures can be reopened, but the procedure may be incapable of removing obstructions depending on clog location and tissue growth extent
Solution Approach 1:
The catheter is divided into multiple independent lumens (first lumen, second lumen, third lumen) instead of a single lumen. Each lumen has its own aperture for CSF entry. This segmentation ensures that if one aperture becomes blocked, the other lumens remain functional, thereby maintaining drainage efficiency while reducing the overall blockage risk.
Solution Approach 2:
The apertures are designed with specific geometric parameters including tapered configurations and enlarged openings. These parameter changes make the apertures more resistant to tissue ingrowth and debris accumulation, thereby reducing blockage risk while maintaining adequate CSF flow through each aperture.
Data Source
Figure 1~2
Figure 3~6
Figure 7~9
AI summary
A shunt (10) includes a housing (14) having an inlet (16), an outlet (18) and a flow control mechanism disposed within the housing. A ventricular catheter (12) is connected to the inlet of the housing. The catheter has a longitudinal length, a proximal end (20), a distal end (22), and an inner lumen (24) extending therethrough. The inner lumen of the catheter includes at least two lumens (24',24'') at the distal end and has only one lumen at the proximal end. The catheter has one slit (30) and aperture (26) corresponding to each of the at least two lumens located at the distal end of the catheter.