Biopsy Needle Tip with Multi-Bevel Geometry for Low-Cost Tissue Collection

The needle point is divided into multiple beveled surfaces (first, second, third, and fourth beveled surfaces) with different functions. The first beveled surface provides the primary cutting edge, while the second and third beveled surfaces provide additional cutting edges at specific angles. This segmentation allows the needle to achieve effective tissue cutting without requiring a sharp blade throughout the entire circumference, thereby reducing machining complexity and cost while maintaining adequate tissue collection capability.

Different portions of the needle point are given different properties: the first beveled surface has a specific angle for primary cutting, the second and third beveled surfaces have angles less than 90 degrees for additional cutting edges, and the fourth beveled surface provides a rounded transition. This local differentiation of properties allows the needle to achieve effective tissue cutting with reduced machining requirements compared to a uniformly sharp circumferential blade.

The needle point employs multiple beveled surfaces that create dynamic cutting edges during insertion. The first beveled surface provides the initial cutting action, while the second and third beveled surfaces engage at different stages of insertion, creating a progressive cutting effect that enhances tissue collection capability within a small diameter needle.

Instead of relying solely on the radial dimension (circumferential sharpness), the invention utilizes the axial dimension by creating multiple beveled surfaces at different angles along the needle length. This multi-dimensional approach to cutting edge geometry allows effective tissue cutting and collection with a reduced needle diameter.