Curved-Bevel Puncture Needle for Lower Insertion Resistance
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Solution Overview
Problem
Medical puncture needles with multiple beveled surfaces of different angles can alleviate pain but often form ridges that increase puncture resistance, limiting pain reduction for patients.
Innovation Solution
A medical puncture needle design featuring a beveled shape with curved surfaces that gradually reduce in angle towards the needle tip, eliminating ridges and reducing puncture resistance, along with a manufacturing method using wire cutting to form these bevels on a rotating linear member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple slanted surfaces of different angles are connected to form bevels, then pain during insertion is alleviated, but ridges are formed at connection points which increase puncture resistance
Solution Approach 1:
The patent applies curvature by replacing the conventional sharp ridges formed by connecting multiple slanted surfaces with smooth curved transition surfaces. The curved surface connects the first and second slanted surfaces, eliminating the formation of sharp ridges while maintaining the pain-alleviating bevel structure. This curvature principle resolves the contradiction by removing the harmful ridge formation that increases puncture resistance, while preserving the beneficial pain reduction effect of the multi-angle bevel design.
2Object-affected harmful factors
If multiple slanted surfaces are connected to create a beveled shape, then insertion pain is reduced, but the complexity of the surface geometry increases forming ridges
Solution Approach 1:
The curved transition surface replaces the complex angular geometry of connected slanted surfaces with a smooth continuous curve. This reduces the geometric complexity by eliminating sharp edges and multiple planar intersections, while maintaining the progressive angle change that alleviates insertion pain. The curved surface provides a simpler, more elegant geometric solution that achieves the same pain reduction function without the complexity of multiple rigid planes.
3Ease of manufacture
If conventional wire cutting is used on stationary material, then manufacturing is simple, but precise curved bevels cannot be formed
Solution Approach 1:
The patent introduces dynamic motion by rotating the workpiece during the wire cutting process. Instead of cutting a stationary material, the material rotates while the wire cuts, enabling the formation of precise curved surfaces. This dynamic manufacturing approach maintains the simplicity of wire cutting as the core process while adding rotational motion to achieve the required curved bevel geometry with high precision.
Solution Approach 2:
The manufacturing process transitions from a two-dimensional cutting operation (wire moving linearly through stationary material) to a three-dimensional operation by adding rotational motion of the workpiece. This dimensional change enables the creation of curved surfaces that require variation in multiple directions simultaneously, achieving complex curved bevel precision while building upon the simple base process of wire cutting.
Data Source
AI summary
A medical puncture needle includes an end portion including a needle tip; and a main body portion contiguous with the end portion, having a substantially circular cross-sectional outer shape. The end portion includes a first bevel formed by a curved surface, the bevel having an angle that gradually decreases toward the needle tip in an axial direction, in a cross-section orthogonal to the axial direction, relative to an imaginary plane that extends along an axis of the main body portion.