Sharpened Needle Geometry for Powder Inhaler Capsule Piercing
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Solution Overview
Problem
Existing powder inhalers face challenges in precisely piercing or cutting open capsules to ensure complete expulsion of medicament compositions, as blunt needles damage the capsules and fail to deliver the medicament effectively.
Innovation Solution
A powder inhaler equipped with specially sharpened needles, such as triangular or relief-ground points, designed to accurately perforate or cut open capsules with minimal patient effort, ensuring efficient delivery of medicament compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a blunt needle is used to pierce the capsule, then the needle structure is simple, but the capsule is damaged and powder delivery is incomplete
Solution Approach 1:
The patent applies parameter changes by modifying the needle's geometric parameters - specifically the sharpening angle (30-60 degrees) and the point geometry (faceted or relief-ground). These parameter changes transform the needle from a blunt structure that merely indents the capsule to a precisely sharpened structure that creates clean puncture holes, enabling complete powder delivery while maintaining manufacturing feasibility.
Solution Approach 2:
The patent applies local quality by creating a specialized sharpened region at the needle tip while keeping the rest of the needle body simple. The local quality enhancement is achieved through faceted sharpening (multiple flat surfaces meeting at an edge) or relief-ground sharpening (a conical point with relief angles), which concentrates the cutting action at the tip while maintaining overall structural simplicity for easy manufacture.
2Manufacturing precision
If a specially sharpened needle is used to pierce the capsule precisely, then the powder delivery is complete, but the needle manufacturing becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the needle into distinct functional zones: a simple cylindrical body for structural integrity and ease of manufacture, and a specialized sharpened tip region for precise puncture. The sharpened tip is further segmented into facets or relief-ground zones, each performing a specific cutting function. This segmentation allows the complex sharpening to be applied only where necessary, reducing overall manufacturing complexity.
Solution Approach 2:
The patent applies the inversion principle by approaching the sharpening process from the tip outward rather than trying to create the point from the full length. The faceted sharpening is achieved by removing material from the tip in controlled steps, and the relief-ground sharpening is created by grinding from the tip backward at specific angles. This inverted approach simplifies manufacturing compared to trying to form the entire needle geometry in one complex operation.
3Productivity
If more patient effort is applied to pierce the capsule, then the capsule can be opened, but the patient effort and device complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-sharpening the needle tip to a precise geometry (30-60 degree faceted or relief-ground point) before use. This preliminary preparation of the needle ensures that minimal patient effort is required during operation, as the pre-configured sharp geometry concentrates force effectively on first contact with the capsule, enabling easy piercing without requiring the patient to apply excessive force or repeat the action.
Data Source
AI summary
The invention relates to a powder inhaler with at least one specially sharpened needle, to ensure the precise piercing or cutting open of capsules and hence the optimum delivery of powdered medicament compositions, medicament formulations or medicament mixtures, as well as ensuring that little effort is needed to perforate or cut open the capsule.