Dry Powder Inhaler Containment Unit for Better Deaggregation

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Solution Overview

Problem

Existing dry powder inhalers face issues with poor deaggregation performance, high mouth-throat deposition, and inefficient delivery of pharmaceutical aerosols, particularly in inhalation toxicology testing and noninvasive ventilation systems, due to direct airflow through the powder bed and rapid aerosolization.

Innovation Solution

The use of containment units with specifically positioned and sized inlet and outlet apertures, configured to create a direct airflow path that avoids the powder bed, utilizing inlet jet momentum and secondary airflows to enhance deaggregation, and integrated with delivery systems for controlled aerosol delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If all air passes directly through the powder bed to enable complete powder aerosolization, then powder delivery is maximized, but deaggregation performance deteriorates and mouth-throat deposition increases

Engineering Contradiction:

Improvepowder deliveryVSAvoiddeaggregation performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The airflow path is segmented into two distinct channels: a direct path that bypasses the powder bed for most air flow, and a secondary path that allows controlled air interaction with the powder bed. This segmentation resolves the contradiction by allowing the majority of air to bypass the powder bed (maintaining deaggregation performance) while a portion still interacts with it (ensuring powder delivery).

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A bypass channel acts as an intermediary pathway, allowing air to reach the outlet without directly passing through the powder bed. This intermediary structure enables controlled interaction between air and powder, preventing direct airflow through the powder bed while still achieving effective powder aerosolization through the bypass mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If piercing elements are used to open capsules or blisters, then powder access is enabled, but capsule flaps interfere with flow at the needle opening

Engineering Contradiction:

Improvepowder accessVSAvoidflow interference

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The piercing element is completely removed from the system and replaced with a pre-formed aperture in the containment unit. This extraction eliminates the problem of capsule flaps interfering with flow, as there is no piercing action that creates flaps. The aperture provides direct, unobstructed access for airflow while maintaining capsule integrity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If piercing elements remain in the capsule to serve as conduits, then powder flow path is established, but the piercing action creates capsule flaps that interfere with flow

Engineering Contradiction:

Improvepowder flowVSAvoidcapsule flap interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

4Ease of operation

If aerosol delivery is performed through small diameter tubing and cannula systems, then noninvasive ventilation is maintained, but delivery efficiency drops to 0.6-2.5% of loaded dose

Engineering Contradiction:

Improvenoninvasive ventilation continuityVSAvoidaerosol delivery efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The containment unit is pre-configured with optimized aperture geometry and airflow channels that maximize aerosol generation efficiency before the powder is delivered through the small diameter tubing. This preliminary optimization ensures that the aerosol is already highly efficient when it enters the ventilation system, compensating for the inherent efficiency losses in small diameter delivery systems.

Inventive Principle:

Principle #10Preliminary 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

Improves deaggregation and delivery efficiency, reducing unwanted deposition and hygroscopic growth, with enhanced aerosol characteristics and higher emitted doses, suitable for various subjects including infants, children, and laboratory animals.

Implementation Method 1

The inlet and outlet apertures are positioned, sized, and arranged relative to one another to provide a direct airflow path which does not directly pass through a dry powder bed

Methodology Applied

Scientific EffectInertial impaction: Impact Force

Implementation Method 2

utilizing inlet jet momentum and secondary airflows to enhance deaggregation

Methodology Applied

Scientific EffectTurbulence: Turbulence

Implementation Method 3

reducing unwanted deposition and hygroscopic growth

Methodology Applied

Scientific EffectHygroscopic growth: Absorption (physical)

Data Source

PatentUS12521500B2Devices, systems, and methods for dry powder therapies

Publication Date: 2026.01.13 VIRGINIA COMMONWEALTH UNIV

AI summary

Containment units, dry powder inhalers, delivery systems, and methods for the same are disclosed. Exemplary devices are configured to have inlets and outlets which are formed with the containment walls of a containment unit. Air jets formed by the configuration of inlet(s) and outlet(s) inside the containment unit create significant turbulence and deaggregate the powder. Delivery system components downstream of the containment unit may integrate the exiting aerosol plume with a low flow nasal cannula air stream for delivery to a subject.