Inhaler Protrusions for Laminar Flow and Resistance Tuning
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Solution Overview
Problem
Current dry powder inhalers lack adaptability in airflow resistance, making it difficult to ensure efficient delivery of medication to patients, as the design features have not been extensively researched to accommodate varying patient inspiratory flow rates and drug dosages.
Innovation Solution
A drug delivery assembly with a body having a drug-receiving chamber and a fluid passage with shaped protrusions that reduce airflow resistance, promoting laminar flow and ensuring accurate inspiratory flow rates, which can be easily adapted to fit different patient conditions by adjusting the protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the airflow resistance of the inhaler is increased, then the drug delivery efficiency is improved, but the required inspiratory flow rate from the patient increases significantly
Solution Approach 1:
The patent applies parameter changes by modifying the cross-sectional area of the airflow pathway at different sections of the inhaler and cartridge system. By varying the geometry parameters of the air conduits, the invention achieves tunable airflow resistance that optimizes drug delivery efficiency while maintaining manageable inspiratory flow rate requirements for patients.
2Ease of operation
If the airflow resistance is reduced to lower inspiratory flow rate requirements, then patient compliance is improved, but drug delivery efficiency decreases
Solution Approach 1:
The invention uses parameter changes to adjust the cross-sectional area of air conduits, creating an optimized balance between airflow resistance and inspiratory effort. This allows the inhaler to maintain high drug delivery efficiency while requiring only moderate inspiratory flow rates, thereby improving patient compliance.
3Productivity
If the cross-sectional area of air conduits is varied to tune airflow resistance, then airflow distribution is optimized, but the device complexity increases
Solution Approach 1:
The patent applies local quality by varying the cross-sectional area at specific sections of the airflow pathway rather than uniformly throughout. This localized geometric modification optimizes airflow distribution and resistance tuning while minimizing the overall structural complexity of the inhaler device.
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 assembly provides a suitable airflow resistance for efficient drug delivery, ensuring that drug particles are not adhered to the inhaler's surfaces, and allows for precise control of inspiratory effort, making it suitable for delivering medications like the Fluticasone Propionate and Salmeterol combination effectively.
Implementation Method 1
shaped protrusions that reduce airflow resistance, promoting laminar flow
Data Source
Figure 1~2
Figure 3~4
AI summary
The assembly (100) comprises a body (105) having a drug-receiving chamber (110) and a fluid passage (120) in communication thereto. The fluid passage (120) has at least one inlet portion (120a; 120b) through which a fluid flow path (130) is defined when air passes through the drug-receiving chamber (110). One or more protrusions (200) are formed in the inlet portion (120a; 120b) comprising a first segment (200a) and a second segment (200b) forming an angle to each other. The second segment (200b) is arranged such that the flow of fluid passing through the fluid passage (120) is a laminar flow.