Capsule Spin Chamber Geometry for Full-Dose Dry Powder Inhalation

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Solution Overview

Problem

Existing dry powder inhalers face issues such as powder migration, disrupted airflow, and inefficient delivery of medication due to flawed spin chamber designs, leading to reduced treatment efficacy for conditions like asthma.

Innovation Solution

A preloaded inhaler with a spin chamber featuring a primary recess for capsule rotation, a secondary recess for capsule holding, and curved inlet channels with tangential and funnel sections to ensure efficient airflow and capsule mixing, delivering a dry powder formulation containing antigen binding fragments of anti-TSLP antibodies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing spin chamber designs are used, then device simplicity is maintained, but powder migration occurs and airflow is disrupted leading to reduced medication delivery efficiency

Engineering Contradiction:

Improvemedication delivery efficiencyVSAvoidspin chamber design complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The spin chamber is divided into distinct functional zones: a primary recess for capsule placement and rotation, a secondary recess for powder containment, and curved inlet channels for controlled airflow. This segmentation prevents powder migration while maintaining efficient medication delivery to the lungs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Curved inlet channels are designed with smooth transitions and rounded geometry to eliminate sharp corners that cause airflow disruption. The curved design ensures laminar flow patterns that efficiently transport medication particles to the patient without causing turbulence or powder deposition in unintended areas.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of manufacture

If simple spin chamber geometry is used, then manufacturing is easier, but airflow disruption occurs preventing full capsule emptying

Engineering Contradiction:

Improvespin chamber manufacturing easeVSAvoidcapsule emptying efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The spin chamber incorporates curved inlet channels with smooth transitions instead of sharp angles, and a rounded primary recess geometry that facilitates complete capsule emptying. These curved surfaces guide airflow efficiently through the capsule contents without creating dead zones where powder could accumulate, ensuring full dose delivery while remaining manufacturable.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Quantity of substance

If conventional inlet channel design is used, then device complexity is low, but powder migration back into inhaler occurs instead of delivering full dose

Engineering Contradiction:

Improvemedication dose deliveredVSAvoidinlet channel structure complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The inlet channel system is segmented into curved sections with controlled geometry that directs airflow unidirectionally through the primary and secondary recesses. This segmented design creates pressure gradients that prevent powder from migrating back into the inhaler body while ensuring complete medication delivery to the patient.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Curved inlet channels are designed with smooth, continuous surfaces that eliminate sharp corners and dead zones where powder could accumulate and migrate. The curved geometry maintains laminar airflow that efficiently transports medication forward while preventing backward migration into the inhaler mechanism.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 design enhances medication delivery to the lungs, ensuring a full dose is administered effectively, improving treatment outcomes for TSLP-related conditions like asthma.

Implementation Method 1

a primary recess configured to receive air to mix with contents of a capsule

Methodology Applied

Scientific EffectAirflow mixing: Convection

Implementation Method 2

the primary recess having a curved wall configured to allow rotation of the capsule

Methodology Applied

Scientific EffectRotation: Centrifugal Force

Implementation Method 3

at least one curved inlet channel configured to allow air to travel therethrough

Methodology Applied

Scientific EffectAirflow direction: Fluid Spray

Data Source

PatentUS20260034317A1Inhaler and capsule for delivering thymic stromal lymphopoietin (TSLP)-binding antibodies

Publication Date: 2026.02.05 MEDIMMUNE LTD

AI summary

A preloaded inhaler comprises a spin chamber in which a primary recess is configured to receive air to mix with contents of a capsule. The primary recess has a curved wall configured to allow rotation of the capsule. A secondary recess is configured to hold the capsule and is located within a bottom surface of the primary recess. A curved inlet channel allows air to travel therethrough. The curved inlet channel defines a curved recess and comprises a tangential section and a funnel section. A capsule containing a dry powder formulation which comprises an antigen binding fragment of an anti-thymic stromal lymphopoietin (TSLP) antibody is held in the spin chamber.