Nitric Oxide Releasing Tympanostomy Tubes for Infection Prevention

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Solution Overview

Problem

The high incidence of postoperative otorrhea and microbial infections following tympanostomy tube insertion poses significant morbidity and treatment challenges, with existing solutions relying on potentially ototoxic antibiotics.

Innovation Solution

Development of antimicrobial gas-permeable tympanostomy tubes that sequester and release nitric oxide (NO) gas, providing antimicrobial properties without the need for antibiotics, by using curable silicones and NO-releasing coatings to inhibit microbial growth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If antibiotic drops are used to prevent postoperative otorrhea, then the incidence of infection is reduced, but potential ototoxic reactions occur

Engineering Contradiction:

Improveinfection preventionVSAvoidototoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the antimicrobial function from the harmful antibiotic drops and concentrates it into a localized coating on the tympanostomy tube. This separates the beneficial antimicrobial action from the harmful ototoxic effects, allowing infection prevention without systemic or local toxicity to the ear. The antimicrobial coating is applied directly to the tube surface, providing targeted protection only where needed.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an intermediary substance - a carrier coating material - that delivers the antimicrobial agent to the tube surface. This intermediary coating serves as a vehicle to transport and release the antimicrobial compound, enabling controlled local delivery without the need for toxic antibiotic drops. The coating acts as a mediator between the antimicrobial agent and the ear environment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If antibiotic drops are applied routinely, then postoperative otorrhea incidence is reduced, but adverse toxicological reactions are not fully studied

Engineering Contradiction:

Improveinfection preventionVSAvoidtoxicological safety

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent employs a disposable antimicrobial coating applied to the tympanostomy tube that provides protection during the critical postoperative period. This single-use coating eliminates the need for repeated antibiotic drop applications, reducing cumulative exposure to potential toxins while maintaining adequate infection prevention during the tube's service life.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the delivery parameter of the antimicrobial agent from systemic/oral administration (antibiotic drops) to localized surface coating. This parameter change in delivery method allows for precise control of the antimicrobial concentration at the site of infection without the adverse effects of systemic absorption, improving both safety and precision of treatment.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If tympanostomy tubes are inserted, then middle ear effusion is treated, but high incidence of otorrhea develops

Engineering Contradiction:

Improveeffusion treatmentVSAvoidinfection risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies the antimicrobial coating to the tympanostomy tube before insertion into the ear. This preliminary action ensures that the tube is pre-armored against bacterial contamination and otorrhea development from the moment of implantation, preventing infection rather than treating it after occurrence. The coating is applied to the tube surface prior to surgical insertion.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements preliminary anti-action by applying the antimicrobial coating to counteract and prevent the high incidence of otorrhea that typically follows tube insertion. The coating creates a protective barrier that actively opposes bacterial adhesion and infection development, thereby counteracting the inherent infection risk of the surgical procedure before it manifests.

Inventive Principle:

Principle #9Preliminary anti-action

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

The NO-releasing tympanostomy tubes effectively reduce microbial proliferation and infection rates, offering a safer alternative to antibiotic treatments by preventing biofilm formation and promoting wound healing without adverse toxicological reactions.

Implementation Method 1

antimicrobial gas-permeable tympanostomy tubes that sequester and release nitric oxide (NO) gas

Methodology Applied

Scientific EffectGas permeation: Permeation

Implementation Method 2

by using curable silicones and NO-releasing coatings

Methodology Applied

Scientific EffectCuring: Chemical Bonding

Data Source

PatentUS11337863B2Antimicrobial gas impregnated devices and methods

Publication Date: 2022.05.24 ENOX ISRAEL LTD

AI summary

A nitric oxide gas-releasing conduit configured for surgical implantation through a patient's tympanic membrane. The nitric oxide gas-releasing conduit comprises a gas-permeable cured resin material configured for releasably sequestering therein gas. The gas-permeable cured resin material is charged with nitric oxide gas. The nitric oxide gas-releasing conduit may be optionally coated with an antimicrobial gas-releasing composition. The gas-releasing coating composition may be configured to release nitric oxide.