Excimer Laser Trabeculostomy for Failed Glaucoma Treatment
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Solution Overview
Problem
Traditional methods for treating glaucoma, including pharmaceutical, laser, and surgical treatments, often fail to effectively manage elevated intraocular pressure (IOP) in advanced stages, leading to irreversible vision loss due to fluid build-up in the eye.
Innovation Solution
The use of excimer laser trabeculostomy (ELT) to create perforations in the trabecular meshwork and/or Schlemm's canal, allowing for immediate fluid drainage by positioning a laser probe transverse to the canal and applying laser energy to create precise tissue ablation without thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pharmaceutical or laser treatments are used to manage glaucoma, then fluid drainage is increased to lower IOP, but these treatments become ineffective in advanced stages of the disease
Solution Approach 1:
The invention changes the fundamental parameter of the treatment approach from medical management (pharmaceuticals, laser) to mechanical intervention (surgical implant). This parameter change enables the treatment to be effective in advanced stages where less invasive methods fail, as the implant physically creates a new drainage pathway regardless of the degree of trabecular meshwork damage.
Solution Approach 2:
The surgical implant divides the drainage function into separate components: the implant itself creates the primary drainage pathway, while the natural trabecular meshwork and Schlemm's canal continue to function secondarily. This segmentation allows the implant to provide reliable drainage even when natural pathways are compromised in advanced glaucoma.
2Reliability
If surgical procedures such as implant insertion are used to treat advanced glaucoma, then fluid drainage is improved, but risks such as implant dislodgment occur
Solution Approach 1:
The implant is extracted from the natural drainage pathway anatomy and positioned in the suprachoroidal space, separating it from the trabecular meshwork and Schlemm's canal. This extraction eliminates the risk of implant dislodgment into the anterior chamber while still achieving effective aqueous humor drainage through the suprachoroidal space.
Solution Approach 2:
The suprachoroidal space serves as an intermediary pathway between the anterior chamber and the venous system. The implant utilizes this intermediate space to drain aqueous humor, avoiding direct contact with mobile structures in the anterior chamber that could lead to dislodgment, while still achieving the therapeutic goal of IOP reduction.
3Reliability
If laser treatments are applied to increase fluid outflow, then IOP is reduced, but thermal damage and scar tissue formation can occur
Solution Approach 1:
The invention replaces the thermal-mechanical laser system with a purely mechanical surgical implant system. Instead of using laser energy to create openings (which generates heat and potential thermal damage), a surgical instrument physically creates the drainage pathway mechanically, eliminating thermal injury risks while achieving the same functional outcome of enhanced fluid outflow.
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
ELT provides effective fluid drainage and reduced IOP, minimizing thermal injury and scar tissue formation, thus addressing the limitations of previous treatments and preventing further vision loss.
Implementation Method 1
a laser probe is positioned transverse to the Schlemm's canal to create perforations the trabecular meshwork and/or Schlemm's canal to immediately improve fluid drainage
Data Source
AI summary
A method of treating a subject having glaucoma comprises performing excimer laser trabeculostomy (ELT) on a subject having glaucoma and having previously undergone a failed treatment or a treatment that has been rendered ineffective by progression of the disease. In some examples, the failed treatment is a non-surgical treatment comprising administering medicated eye drops. In some examples, the failed treatment is a laser treatment or surgical treatment, such as a trabeculoplasty, iridotomy, iridectomy, trabeculectomy, trabeculotomy, goniotomy, surgical insertion of a shunt or implant, deep sclerectomy, viscocanalostomy, or a combination thereof.