Trocar Concave Cutting Edges Penetration Force
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Solution Overview
Problem
Conventional trocars with straight-line blades fail to optimize penetration force due to limitations in internal angle and cutting edge inclination, resulting in suboptimal tissue penetration during minimally invasive procedures.
Innovation Solution
A trocar design featuring at least three concave cutting edges and surfaces, with specific angles and orientations to minimize internal angles and maximize cutting edge inclination, along with a manufacturing method involving grinding and rotation of shafts to form these surfaces, enhancing penetration force and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a straight-line type blade is used, then the structure is simple and easy to manufacture, but the penetration force cannot be optimized because small internal angle and large inclination angle cannot be satisfied
Solution Approach 1:
The patent applies curvature by forming concave cutting surfaces instead of straight-line blades. The cutting edges are formed by intersecting concave surfaces that curve toward the sharp end, creating optimal penetration angles. This curvature allows the cutting edges to achieve both small internal angles and large inclination angles simultaneously, maximizing penetration force while maintaining manufacturability through controlled surface formation processes.
2Force
If multiple grinding operations with rotation are used to form concave surfaces, then the penetration force is maximized, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs continuous grinding operations where the shaft is rotated and ground to form concave surfaces in a continuous manner. The process maintains continuous contact between the grinding wheel and the rotating shaft, ensuring uniform concave surface formation. This continuous action achieves optimal cutting edge geometry for maximum penetration force while streamlining the manufacturing process through uninterrupted material removal.
Solution Approach 2:
The manufacturing process utilizes periodic rotation of the shaft at specific angles (including angles greater than 90° and smaller than 180°) to form multiple concave cutting surfaces. The shaft is rotated to predetermined angles, ground, then rotated to the next angle for subsequent grinding operations. This periodic angular positioning and grinding cycle efficiently creates the required concave geometry with optimized penetration characteristics.
3Ease of operation
If conventional straight-line blades are used, then the manufacturing is straightforward, but tissue penetration is less smooth and causes more pain
Solution Approach 1:
The patent applies local quality by creating concave cutting surfaces with specific geometric properties at the cutting edges. The concave surfaces are formed with precise curvature and orientation to optimize the local cutting action at each point along the cutting edge. This localized geometric optimization ensures smooth tissue penetration and reduced pain while maintaining overall structural integrity and manufacturability of the trocar.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The trocar achieves improved penetration force and convenience in manufacturing, allowing for smoother tissue penetration with reduced pain and increased productivity through optimized cutting edge geometry and continuous manufacturing processes.
Implementation Method 1
forming a concave first cutting surface by grinding a shaft extended in one direction
Data Source
AI summary
According to an exemplary embodiment of the present invention, a trocar is provided. The trocar includes: a sharp end; at least three concave cutting edges extended from the sharp end; and at least three concave cutting surfaces forming the sharp end and the at least three cutting edges.