Punctal Plugs for Controlled Drug Release
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Solution Overview
Problem
Current methods for delivering medication to the eye, such as eye drops and topical sustained release systems, are inefficient and uncomfortable, leading to poor patient compliance and ineffective drug delivery due to issues like overflow, systemic side effects, and discomfort.
Innovation Solution
Punctal plugs designed to be positioned within the lacrimal canaliculus, featuring a drug core with a swell plate and drug chamber that utilize lacrimal fluid for controlled and autonomous release of therapeutic agents through a fluid outlet, ensuring steady and pulsatile delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eye drops are used to deliver medication to the eye, then the active agent can penetrate through the cornea and reach therapeutic concentration levels, but a substantial portion of the drop is lost due to overflow and drainage, reducing delivery efficiency
Solution Approach 1:
The invention extracts the drug delivery function from conventional eye drops by using punctal plugs that are inserted into the lacrimal punctum to deliver medication directly into the eye, bypassing the conjunctival sac and preventing overflow loss
Solution Approach 2:
The punctal plug serves as an intermediary device between the medication and the eye, controlling the release of active agents through the lacrimal punctum and canaliculus system to ensure efficient delivery without overflow
2Extent of automation
If sustained release systems are placed into the conjunctival cul-de-sac, then autonomous drug release is achieved, but the units are uncomfortable and patient acceptance is poor
Solution Approach 1:
The invention copies the natural tear drainage pathway anatomy by designing punctal plugs that fit into the lacrimal punctum and canaliculus, making the autonomous delivery system invisible and comfortable for patients
Solution Approach 2:
The punctal plug delivers medication locally at the site of insertion in the lacrimal punctum, providing autonomous release without the discomfort of larger systems in the conjunctival cul-de-sac
3Reliability
If devices are inserted into the lacrimal punctum to deliver active agents, then direct eye delivery is achieved, but much of the agent is delivered in an initial large bolus rather than linear delivery over time
Solution Approach 1:
The punctal plug incorporates dynamic release mechanisms including osmotic pumps and swellable materials that adjust the release rate of medication over time, transitioning from initial bolus delivery to sustained linear release
Solution Approach 2:
The invention replaces simple mechanical insertion with sophisticated release mechanisms including osmotic engines and polymer swelling systems that control medication release kinetics for linear delivery over time
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
Provides a comfortable and effective method for sustained drug release directly into the eye, overcoming the inefficiencies of traditional delivery methods by maintaining therapeutic levels and reducing adverse events.
Implementation Method 1
the drug core insert comprises a swell plate and a drug chamber; the swell plate comprising a timer channel and a plurality of swell chambers
Data Source
AI summary
Lacrimal inserts such as punctal plugs may be utilized for delivery of medication to the eye. The plug includes a body portion sized to pass through a lacrimal punctum and be positioned within a lacrimal canaliculus of the eyelid. The plug may contain a core, or reservoir, at least partially within the body portion comprising a therapeutic agent that is configured for controlled, pulsatile release into the eye.