Trans-round Window Membrane Injection Handpiece
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Solution Overview
Problem
Current methods for delivering therapeutics to the inner ear face challenges such as lack of precision in dose delivery, limitations on molecule size, and variable membrane permeability, particularly due to reliance on diffusion across semi-permeable membranes.
Innovation Solution
A handpiece designed for direct delivery of therapeutic substances to the inner ear, featuring a tool shaft, angled portion, and tip portion with a collar to pierce the round window membrane, allowing controlled injection into the cochlea via a continuous fluid channel, enabling precise delivery independent of diffusion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diffusion across semi-permeable membranes is used for drug delivery, then the therapeutic substance can cross from middle ear to inner ear, but the dose delivery precision is poor
Solution Approach 1:
The invention extracts the tip portion of the handpiece as a separate, replaceable component that can be precisely positioned and controlled. This allows the delivery mechanism to be optimized independently from the handling portion, enabling precise dose delivery through controlled injection rather than passive diffusion.
Solution Approach 2:
The invention replaces the passive diffusion mechanism with an active injection system. The handpiece with controlled fluid delivery replaces the reliance on membrane permeability and concentration gradients, providing precise mechanical control over drug delivery timing, location, and dosage.
2Adaptability or versatility
If diffusion across membranes is used, then drug delivery is possible, but molecule size is limited
Solution Approach 1:
The tip portion is extracted as a separate component that can be designed with specific geometries and materials optimized for different therapeutic substances. This allows the system to accommodate various molecule sizes without being constrained by membrane properties.
Solution Approach 2:
The handpiece system is designed as a universal platform that can deliver various therapeutic substances including those with different molecule sizes. The replaceable tip portions and controlled injection mechanism allow the same basic system to handle diverse drugs that would have different diffusion characteristics across membranes.
3Measurement precision
If diffusion is used for drug delivery, then therapeutic substance can reach inner ear, but delivery precision and control are limited
Solution Approach 1:
The handpiece is segmented into distinct components: a handle for operation, a shaft for positioning, and a replaceable tip portion for delivery. This segmentation allows each component to be optimized for its specific function while maintaining overall system manageability. The tip portion can be precisely engineered for controlled delivery and then replaced if needed.
Solution Approach 2:
The passive diffusion system is replaced with an active mechanical injection system. The handpiece provides direct mechanical control over drug delivery through the round window membrane, enabling precise dosing and timing that cannot be achieved through diffusion alone.
4Adaptability or versatility
If round window membrane permeability is relied upon, then drug delivery is possible, but permeability varies between patients and during inflammation
Solution Approach 1:
The invention replaces reliance on variable biological membrane properties with a controlled mechanical injection system. By directly injecting through the membrane rather than relying on its permeability characteristics, the system achieves consistent dose delivery across different patients and inflammatory states.
Solution Approach 2:
The system changes the delivery parameter from passive diffusion (dependent on membrane permeability) to active injection (controlled by mechanical force). This parameter change makes delivery independent of membrane permeability variations, ensuring consistent dosing regardless of patient-specific or inflammatory conditions.
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
Enables precise and controlled delivery of therapeutic substances directly into the inner ear, overcoming limitations on molecule size and inconsistent diffusion rates, ensuring consistent and effective treatment.
Implementation Method 1
The handpiece of the present disclosure can overcome these challenges by delivering a therapeutic substance directly to the inner ear
Data Source
AI summary
The present disclosure discussed a handpiece for trans-canal delivery of a therapeutic substance to the inner ear. The handpiece can be inserted into the middle ear via a surgical tympanotomy approach. The handpiece can enable a controlled injection of a therapeutic substance directly through the round window membrane and into the inner ear. The direct delivery of the therapeutic substance to the inner ear can enable the delivery of a precise amount of therapeutic substance into the inner ear. Because the therapeutic substance is delivery directly to the inner ear the delivery of the therapeutic substance is not subject to limitations on molecule size and inconsistent diffusion rates that are present when therapeutic substances are diffused across the round window membrane.