Pre-pressurized Chamber Rupture for Dry Powder Inhaler Aerosolization
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Solution Overview
Problem
Current dry powder inhalers (DPIs) face challenges in delivering active pharmaceutical ingredients (API-only) formulations efficiently due to incomplete deagglomeration of drug and carrier particles, leading to high wastage and variability in drug delivery, which is dependent on inhalation strength and prone to dosing errors, making them unsuitable for higher dose therapies.
Innovation Solution
An apparatus with pre-pressurized chambers and a separating wall that ruptures catastrophically to aerosolize powder, using a gas-permeable structure to enhance aerosolization, and a device design that includes a housing with a means to break the external or separating wall to create a pressure difference for efficient powder delivery, independent of inhalation strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If passive DPI devices are used that rely on patient inspiratory energy to create aerosol, then device complexity is low and ease of operation is good, but manufacturing precision of dose delivery is poor and reliability is low due to dependence on inhalation strength
Solution Approach 1:
The patent pre-pressurizes chambers before use, storing energy in advance. When the separating wall ruptures, this pre-stored pressure difference immediately drives aerosolization without depending on patient inhalation strength, ensuring consistent dosing while maintaining simple operation
Solution Approach 2:
The patent introduces a separating wall as an intermediary element between two pressurized chambers. This wall acts as a controlled release mechanism that, when ruptured, mediates the transfer of pressurized gas to create consistent aerosol flow independent of patient effort
2Ease of manufacture
If carrier particles are used to bulk up powder volume for metering, then ease of manufacture is improved and powder handling is aided, but manufacturing precision deteriorates due to incomplete deagglomeration of drug and carrier particles
Solution Approach 1:
The patent pre-mixes drug and carrier particles into a homogeneous blend before dosing. The sudden pressure difference upon separating wall rupture then acts on this pre-prepared mixture, providing sufficient force to completely deagglomerate particles and separate drug from carrier, ensuring complete delivery to the lung
Solution Approach 2:
The patent changes the pressure parameter dramatically by rupturing the separating wall, creating a sudden pressure difference that transitions the powder from a static blended state to a dynamic aerosolized state, enabling complete particle separation
3Manufacturing precision
If larger carrier particles are used to improve metering accuracy, then manufacturing precision of dose delivery is improved, but object-generated harmful factors increase due to drug deposition in mouth and throat rather than deep lung
Solution Approach 1:
The patent uses pneumatic pressure from pre-pressurized gas to drive aerosolization. The controlled rupture of the separating wall creates a directed gas flow that efficiently suspends and transports powder particles into the lung, maximizing deep lung delivery and minimizing oropharyngeal deposition
Solution Approach 2:
The patent changes the velocity parameter of the aerosol stream by using sudden pressure release. This high-velocity aerosolization ensures that even large carrier particles are propelled deep into the lung rather than depositing in the mouth and throat
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 apparatus effectively aerosolizes and delivers respirable powdered drug formulations with high efficiency, minimizing deposition and wastage, and providing a consistent fine particle dose, suitable for delivering higher payloads of carrier-free drug formulations in a cost-effective manner.
Implementation Method 1
a first chamber, containing gas at a first pressure higher than atmospheric pressure, and a second chamber, containing gas at a second pressure higher than atmospheric pressure
Implementation Method 2
The first chamber has a first external wall and a separating wall, the separating wall being shared with the second chamber. The first external wall or the separating wall is configured to rupture if the pressure difference across it becomes equal to or greater than a threshold pressure difference
Implementation Method 3
using a gas-permeable structure to enhance aerosolization
Data Source
AI summary
An apparatus for aerosolized powder delivery includes first and second chambers containing gas at first and second pressures, respectively, above atmospheric pressure. A powder is contained within the first or second chamber. The first chamber has a first external wall and a separating wall shared with the second chamber. The first external wall or the separating wall is configured to rupture if the pressure difference across it becomes equal to or greater than a threshold pressure difference. Specifically, the apparatus is configured so that the difference between the second pressure and atmospheric pressure is greater than the threshold pressure difference. Initially, the difference between the second and first pressures is less than the pressure difference required to rupture the separating wall, and the difference between the first pressure and atmospheric pressure is less than the pressure difference required to rupture the first external wall.