Glaucoma Shunt With Severable Distal Duct For Custom Bleb Positioning
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Solution Overview
Problem
Existing glaucoma drainage devices face issues such as pre-determined bleb positioning, inability to adjust fluid flow resistance, risk of endothelial cell damage, device migration, and complexity in surgery, which can lead to complications like hypotony, filtration failure, and corneal endothelial damage.
Innovation Solution
A shunt with a deformable and severable distal portion that can be cut to desired length, combined with a proximal capillary lumen for adjustable fluid flow resistance, and a fixation body for secure implantation, allowing customizable bleb positioning and reduced risk of migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If glaucoma drainage devices are implanted with pre-determined bleb positioning, then surgical procedure is simplified, but adaptability to patient-specific anatomical variations and optimal bleb location is reduced
Solution Approach 1:
The shunt device is divided into distinct segments: a proximal portion with capillary lumen for fluid resistance, a mid-portion for implantation, and a distal portion that can be cut to desired length. This segmentation allows the surgeon to customize the distal portion length and bleb position while maintaining the integrated design benefits for ease of implantation.
Solution Approach 2:
The distal portion of the shunt is designed to be severable, transforming a static pre-determined length device into a dynamic one that can be adjusted during surgery. This allows the bleb position to be optimized for each patient's anatomy while keeping the overall device structure simple for implantation.
2Device complexity
If glaucoma drainage devices have fixed fluid flow resistance, then device design is simplified, but ability to prevent hypotony and regulate IOP is compromised
Solution Approach 1:
The proximal portion of the shunt incorporates a capillary lumen with specific dimensional characteristics that provide inherent fluid flow resistance. This localized structural feature creates pressure differential control without requiring complex active regulation mechanisms, maintaining design simplicity while ensuring reliable IOP management.
Solution Approach 2:
The capillary lumen's internal diameter and length are designed to create specific flow resistance characteristics that prevent excessive drainage. By controlling the geometric parameters of the proximal portion, the device inherently regulates fluid flow to prevent hypotony while maintaining overall device simplicity.
3Manufacturing precision
If glaucoma drainage devices use rigid structures, then manufacturing precision is improved, but ability to conform to anatomical structures and reduce endothelial cell damage risk is reduced
Solution Approach 1:
The shunt device incorporates curved and tapered geometric features, particularly in the distal portion, that allow it to conform to the natural curvature of scleral tunnels and anatomical structures. This curved design reduces sharp edges and stress concentrations that could damage endothelial cells, while maintaining manufacturing feasibility through standard fabrication processes.
4Device complexity
If glaucoma drainage devices lack fixation mechanisms, then device complexity is reduced, but device migration and positioning accuracy deteriorate
Solution Approach 1:
The shunt device features an asymmetric design with a broader proximal portion and a tapered distal portion. This asymmetry provides natural stabilization during implantation, with the wider proximal end serving as an anchor point that resists migration while the tapered distal end facilitates smooth insertion into the scleral tunnel.
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 shunt provides adjustable fluid flow resistance, customizable bleb positioning, and reduced risk of complications, enhancing surgical efficacy and patient-specific treatment outcomes.
Implementation Method 1
a proximal portion, defining the proximal end of the elongate duct, the proximal portion having a proximal capillary lumen in fluid flow communication with the distal lumen, the proximal lumen having an internal diameter which is relatively smaller than an internal diameter of the distal lumen so as to reduce a flow rate of aqueous humor
Implementation Method 2
the proximal lumen having an internal diameter which is relatively smaller than an internal diameter of the distal lumen so as to reduce a flow rate of aqueous humor and regulate pressure along the proximal capillary lumen
Data Source
AI summary
A shunt for treating glaucoma comprises a silicone rubber duct for diverting aqueous humor from a chamber of a patient's eye and a fixation body frictionally located on the duct in an arrangement permitting sliding displacement of the fixation body, for fixing and sealing the duct within scleral tissue surrounding the eye. The duct has a rigid proximal portion having a proximal end and a deformable distal portion locatable in the scleral channel and having a distal end. The distal portion is severable, allowing a surgeon to cut the distal portion to a desired length corresponding to the anatomical dimensions of the patient's eye and a required bleb position. The proximal portion has a capillary lumen having a diameter which is smaller than a diameter of a lumen of the distal portion, thereby reducing a flow rate of aqueous humor along the capillary lumen.