Multi-Dose Gas-Powered Inhaler for Powder De-agglomeration
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Solution Overview
Problem
Existing dry powder inhalers face challenges in achieving high delivery efficiency and complete emptying of powder doses due to difficulties in de-agglomeration and uneven powder distribution, leading to incomplete inhalation and reduced efficacy.
Innovation Solution
A compact, active, gas-powered multi-dose dispensing device with a radially movable actuator and guiding mechanisms for precise alignment and operation, ensuring high delivery efficiency and desired spray plume characteristics by using a common carrier with separate, easily accessible receptacles and a mechanism for reinsertion of inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive inhaler is used where powder is inhaled by the patient without additional energy source, then the device complexity is reduced, but the inhalable fraction and delivery efficiency become dependent on patient breathing variability
Solution Approach 1:
The patient's own breathing action serves as the power source for the inhaler. The breathing actuation mechanism converts the patient's inhalation flow into mechanical motion that drives the powder delivery system, eliminating the need for external power sources while maintaining reliable delivery through patient-specific flow sensing and response
Solution Approach 2:
The patent replaces traditional mechanical spring-loaded or pump-based powder delivery mechanisms with a breathing-actuated system that uses patient inhalation flow to directly drive powder release. This substitution reduces device complexity by eliminating motors, batteries, and complex mechanical actuation systems while maintaining delivery reliability through flow-sensitive triggering
2Device complexity
If the powder is stored in a single large container, then the device complexity is reduced, but the powder distribution becomes uneven and de-agglomeration is difficult
Solution Approach 1:
The patent divides the powder storage into multiple separate powder reservoirs or compartments, each containing a portion of the total powder dose. This segmentation ensures uniform powder distribution from each compartment, facilitates complete emptying of individual smaller volumes, and improves de-agglomeration by reducing powder compactation effects while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The patent employs a rotating carousel or multi-position powder delivery mechanism that transitions the powder delivery system from a single static container to a multi-dimensional array of powder sources. This allows sequential access to multiple powder compartments, ensuring complete utilization of all powder material while maintaining compact device form factor through rotational or translational positioning mechanisms
3Reliability
If the powder particles are made very small to reach alveolar region, then the delivery efficiency to lung is improved, but the particle aggregation increases and de-agglomeration becomes more difficult
Solution Approach 1:
The patent employs periodic pulsing of the powder delivery mechanism to create controlled bursts of airflow that sequentially dislodge and transport powder particles from the reservoir. This periodic action prevents particle aggregation by maintaining constant motion and reduces de-agglomeration requirements by delivering particles in controlled sequences rather than continuous streams, while keeping device complexity manageable through simple pulsing mechanisms
Solution Approach 2:
The patent utilizes changes in airflow parameters (velocity, pressure, turbulence) during the breathing cycle to optimize particle delivery. By varying flow rate and pressure characteristics in response to patient breathing phase, the system achieves effective de-agglomeration and alveolar delivery of fine particles without requiring complex mechanical disruption mechanisms, maintaining device simplicity while enhancing delivery efficiency
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 device achieves high delivery efficiency and complete emptying of powder doses with improved de-agglomeration and spray characteristics, enhancing the inhalation of drugs to specific lung regions with desired particle sizes.
Implementation Method 1
A compact, active, gas-powered multi-dose dispensing device
Implementation Method 2
difficulties in de-agglomeration and uneven powder distribution
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A dispensing device (1) having a storage device (4) and an air pump (18) for dispensing a medical formulation (2) is proposed. The storage device (4) comprises multiple inserts (6), each insert (6) containing a single dose of the formulation (2). Each insert (6) is located in a. separate and sealed cavity (7). The cavities (7) can be individually opened for dispensing the respective dose from the respective insert (6).