Triangular Suture Needle Reducing Thrust Resistance
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Solution Overview
Problem
Conventional triangular suture needles experience high thrust resistance due to a large tip angle and inconsistent formation of cutting blades, leading to increased difficulty in inserting the needle into tissue and potential variance in grinding, resulting in a short sharpened part and high resistance.
Innovation Solution
A triangular suture needle design featuring an angular triangular prism-shaped part on the needlepoint side and a rounded triangular prism-shaped part connecting to the needle base, with the sharpened part ground to form a pointed tip and cutting blades along the entire angular portion, reducing the tapering angle and allowing for consistent cutting blade formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the tip angle (tapering angle) of the sharpened part is decreased to reduce thrust resistance, then the thrust resistance decreases, but the sharpened part must be elongated which makes manual grinding difficult and increases variance
Solution Approach 1:
The invention changes the geometric parameters of the needle by introducing a specific tapering angle range (10-30 degrees) and a controlled diameter increase rate (0.05-0.2 mm/mm), optimizing the balance between thrust resistance and manufacturability. This parameter optimization allows the sharpened part to be sufficiently long for consistent grinding while maintaining low thrust resistance during insertion.
Solution Approach 2:
The invention performs preliminary shaping of the triangular prism portion with predetermined dimensions and tapering angles before the grinding process. By pre-forming the geometry with controlled diameter increase rates, the subsequent grinding operation becomes more consistent and easier to perform manually, reducing variance in the final sharpened part.
2Force
If the sharpened part is elongated to reduce tip angle and thrust resistance, then thrust resistance decreases, but the grinding operation becomes difficult to perform properly with manual operations
Solution Approach 1:
The invention optimizes the length and tapering angle parameters of the sharpened part to fall within specific ranges (10-30 degrees tapering angle, 0.05-0.2 mm/mm diameter increase rate) that make manual grinding feasible and consistent. These parameter changes ensure the sharpened part is long enough to reduce thrust resistance but not so long or tapered so steeply that manual grinding becomes impractical.
Solution Approach 2:
The triangular prism portion is pre-formed with controlled geometry and diameter increase rates before grinding. This preliminary shaping creates a more favorable geometry for manual grinding operations, making it easier to achieve consistent cutting blades across all three surfaces even with elongated sharpened parts.
3Ease of manufacture
If a round bar is press formed into a triangular prism with the same area, then the width of triangle sides becomes slightly greater than circular part, but the cutting blade portion diameter is less than parallel part
Solution Approach 1:
The invention changes the press forming parameters by controlling the diameter increase rate of the triangular prism portion (0.05-0.2 mm/mm) and setting specific width relationships between the circular needle base and triangular prism sections. This creates a gradual transition in cross-section that maintains manufacturing feasibility while improving shape uniformity and cutting performance.
Solution Approach 2:
The invention applies different geometric characteristics to different portions of the needle: the needle base maintains a circular cross-section while the triangular prism portion has controlled varying width. This local differentiation allows the press forming process to be simple while creating the necessary shape variations for optimal cutting blade formation and reduced thrust resistance.
Data Source
AI summary
A triangular suture needle having a low thrust resistance and a press mold suitable for manufacturing the same are provided. The triangular suture needle includes: an angular triangular prism-shaped part (100a) on the needlepoint side; a rounded triangular prism-shaped part (100b) connecting to the needle base side of said triangular prism-shaped part; and a thread attaching part (100c) in a needle base end. The entire angular triangular prism-shaped part (100a) is ground, forming a pointed, sharpened part (100d) with a sharp tip. Furthermore, width (w1) of the thickest portion of the sharpened part (100d) is greater than width (w2) of the rounded triangular prism-shaped part connecting to that portion.