Trans-Round Window Membrane Catheter for Inner Ear Drug Delivery
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Solution Overview
Problem
Current methods for delivering medications to the inner ear are ineffective due to low penetration of compounds through the round window membrane, leading to subtherapeutic concentrations and poor bioavailability.
Innovation Solution
A system and method for trans-round window membrane drug delivery using a micropump connected to a cannula inserted through the round window membrane, allowing for direct delivery of compounds into the perilymphatic fluid of the scala tympani.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If systemic delivery is used to deliver medications to the inner ear, then the medication can be administered easily, but the blood-cochlear barrier prevents effective penetration and therapeutic concentrations are not achieved
Solution Approach 1:
The invention extracts the medication delivery pathway from the systemic circulation route and creates a direct delivery path from the round window membrane into the cochlear space, bypassing the blood-cochlear barrier entirely. The catheter is inserted through the round window membrane to deliver medication directly into the perilymphatic fluid, eliminating the barrier problem while maintaining ease of administration through a minimally invasive procedure.
Solution Approach 2:
The round window membrane serves as an intermediary structure that provides access to the cochlear space. The invention uses this natural anatomical feature as a gateway, inserting a catheter through the membrane to bridge the external environment and the inner ear fluid space, enabling direct medication delivery without violating the blood-cochlear barrier.
2Ease of operation
If intra-tympanic injections are used to deliver medications, then the administration is simple, but the quantity of drugs crossing the round window membrane is low and distribution is uneven
Solution Approach 1:
The invention extracts the medication from the middle ear space where it would otherwise be limited by membrane crossing, and delivers it directly into the cochlear perilymphatic fluid. The catheter bypasses the round window membrane barrier by delivering medication on the other side of the membrane, ensuring adequate drug quantity reaches the target site without relying on passive diffusion or membrane crossing.
Solution Approach 2:
The invention changes the delivery dimension from the middle ear cavity space to the cochlear fluid space. By inserting the catheter through the round window membrane into the scala tympani, the system transitions from delivering medication in a confined middle ear space to distributing it directly in the cochlear fluid environment, enabling better distribution throughout the inner ear structures.
3Ease of operation
If intra-tympanic injections are used, then the procedure is simple, but drug bioavailability within the cochlea is poor
Solution Approach 1:
The invention extracts the medication delivery location from the middle ear space to the cochlear perilymphatic fluid space. The catheter delivers medication directly into the scala tympani, placing the drug where it can be absorbed by the cochlear structures, thereby achieving high bioavailability while maintaining procedural simplicity through a single minimally invasive insertion.
Solution Approach 2:
The catheter serves as an intermediary delivery device that bridges the external administration interface and the cochlear fluid environment. It transports medication directly into the perilymphatic fluid, ensuring high bioavailability by placing the drug in direct contact with the cochlear absorption surfaces without requiring complex multi-step procedures.
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
This approach overcomes the limitations of systemic delivery and intra-tympanic injections by achieving higher drug concentrations directly in the inner ear, improving bioavailability and treatment efficacy.
Implementation Method 1
The handpiece can then be pulled away from the middle ear, while the cannula remains behind due to friction between the cannula and the round window membrane.
Data Source
AI summary
The present solution provides systems and methods for trans-round window membrane drug delivery. As an overview, a system can include a micropump that is connected to a flexible cannula. The cannula can be threaded through a handpiece that can be used to pierce the round window membrane of a patient. Using the handpiece, the cannula can be inserted through the round window membrane to improve the distribution of the delivered drug throughout the inner ear. The present solution can function as a small implantable or wearable device that can be used for both chronic and acute trans-round window membrane drug delivery. With this configuration, the micropump can constantly or intermittently deliver, over a period of days to months, small volumes of drugs from an internal reservoir.