Microbubble Drug Delivery to Inner Ear via Cavitation
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Solution Overview
Problem
Current methods for delivering drugs to the inner ear, such as intratympanic injection, face inefficiencies due to the low permeability of the round window membrane and the eustachian tube's role in drug elimination, leading to poor drug penetration and significant side effects from systemic administration.
Innovation Solution
A method involving a microbubble composition mixed with drugs, applied to the middle ear cavity, where mechanical oscillation waves induce cavitation to increase membrane permeability, allowing drug penetration into the inner ear without invasive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If intratympanic injection is used to deliver drugs locally into the inner ear, then side effects from systemic administration are avoided, but drug penetration efficiency is poor due to low round window membrane permeability
Solution Approach 1:
The patent applies mechanical vibration through a sound source to induce cavitation of microbubbles in the middle ear cavity. The vibration causes the round window membrane to oscillate and increases its permeability, enabling drugs to penetrate into the inner ear more effectively while maintaining local administration benefits
Solution Approach 2:
The patent changes the physical state of the drug delivery system by introducing microbubbles that undergo cavitation. This parameter change from stable microbubbles to cavitating microbubbles creates temporary pores in the round window membrane, dramatically increasing drug permeability without systemic administration
2Productivity
If drugs are administered systemically to reach the inner ear through blood circulation, then drug delivery is achieved, but side effects increase and blood labyrinth barrier reduces penetration
Solution Approach 1:
The patent uses microbubbles as an intermediary carrier in the middle ear cavity. These microbubbles serve as a mediator between the drug and the round window membrane, facilitating localized drug delivery to the inner ear without requiring systemic circulation, thereby avoiding systemic side effects
3Ease of operation
If eustachian tube is open in the middle ear cavity, then drug elimination is facilitated, but drug retention time decreases reducing delivery efficiency
Solution Approach 1:
The patent applies preliminary action by inducing cavitation of microbubbles before drug elimination can occur through the eustachian tube. The cavitation process creates immediate and intense local effects on the round window membrane, ensuring drug penetration occurs rapidly during the brief retention period before eustachian tube elimination
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 significantly enhances drug delivery efficiency into the inner ear by increasing the permeability of the round window membrane, as demonstrated by improved drug penetration and safety profiles in animal experiments, with no significant hearing impairment.
Implementation Method 1
the microbubbles of the microbubble-drug mixture in the middle ear producing a cavitation is induced by the mechanical waves
Implementation Method 2
mechanical waves are generated by the mechanical oscillation wave source
Data Source
AI summary
A method of delivering drugs to inner ear facilitated by microbubbles, including mixing a microbubble composition and a drug into a microbubble-drug mixture, applying the microbubble-drug mixture to middle ear cavity, and placing a mechanical oscillation wave source to ear canal or cranium located behind the ear. The mechanical waves generated by the mechanical oscillation wave source penetrate through tympanum or cranium, and induce the cavitation on the microbubbles in the middle ear cavity. Thus, the permeability of the round window membrane is increased, so that the drug penetrates into inner through the round window membrane. Therefore, the mechanical oscillation wave source induces the cavitation on the microbubbles in a non-invasive way.