Multi-Bevel Pen Needle Tip for Consistent Penetration Force
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Solution Overview
Problem
Existing hypodermic needles, particularly pen needles, vary in penetration force and user experience due to differing tip geometries, affecting injection comfort and user preferences.
Innovation Solution
A multi-beveled needle tip geometry with a proximal bevel and symmetrically inclined intermediate and distal bevels, featuring smooth transitions between bevels and the needle's surface, reducing sharp edges and enhancing user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standard single-bevel needle tip geometry is used, then the manufacturing process is simple, but the penetration force varies and user comfort is reduced
Solution Approach 1:
The needle tip is segmented into multiple beveled surfaces (typically three bevels) instead of a single bevel, with each bevel oriented at different angles to distribute penetration forces more evenly during injection
Solution Approach 2:
Different regions of the needle tip are given different geometric properties through multi-bevel design, where each bevel creates a specific local surface orientation optimized for skin penetration while maintaining overall tip sharpness
2Manufacturing precision
If needle tip geometry is simplified, then manufacturing precision requirements are reduced, but penetration force consistency deteriorates
Solution Approach 1:
By dividing the tip geometry into multiple standardized bevels, the manufacturing process can use repeatable angular measurements for each bevel, improving consistency across production batches
Solution Approach 2:
The invention specifies particular angular parameters for each bevel (e.g., first bevel at 30-45 degrees, second bevel at 15-30 degrees, third bevel at 5-20 degrees relative to the needle axis), transforming the geometric design into controlled parameter specifications that enhance manufacturing precision
3Reliability
If a multi-bevel design is implemented, then penetration force consistency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process is segmented into distinct steps for forming each bevel, allowing each angular feature to be created and verified independently, which improves consistency while maintaining process manageability
Solution Approach 2:
By defining specific angular ranges for each bevel, the invention provides clear manufacturing targets that simplify quality control and process standardization, offsetting the increased geometric complexity
Data Source
AI summary
A multi-beveled needle point geometry for hypodermic needles such as pen needles. A proximal bevel is formed at a first angle of inclination, a pair of intermediate bevels at a second angle of inclination, and a pair of distal bevels at a third angle of inclination and differing angles of rotation. The second angle of inclination is substantially different than the first angle of inclination to define a marked apex at the intersections between the proximal bevel and the intermediate bevels. At least one smooth transition is typically provided between adjacent bevels, between a bevel and an outer surface of the needle, and/or between a bevel and the lumen of the needle.