Tapered Cannula and Stylet for Smooth Bone Insertion
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Solution Overview
Problem
Conventional cannula and stylet instruments face challenges with increased resistance during insertion due to a stepped transition, and the distal end of the stylet often protrudes insufficiently, hindering smooth tissue penetration and guidance in surgical procedures.
Innovation Solution
A cannula and stylet set with a distal end having a tapered configuration, where the stylet's tapered transition portion matches the cannula's angled perimeter, facilitating a smooth insertion and reducing tissue disruption, and an optional threaded cannula for secure fixation within the bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional cannula and stylet with stepped transition are used, then the stylet can be inserted into the cannula, but the insertion resistance increases and tissue disruption worsens
Solution Approach 1:
The patent merges the cannula and stylet into a unified instrument set with matching tapered configurations. The stylet's tapered transition portion is designed to approximate the converging angle of the cannula's outer perimeter, creating a seamless transition that eliminates the stepped configuration and reduces insertion resistance.
Solution Approach 2:
The patent applies different geometric qualities to different portions of the instrument set. The distal end of the cannula and the transition portion of the stylet are specifically tapered at matching angles to create a smooth transition, while other portions maintain their structural integrity for specific functions.
2Ease of operation
If the stylet distal end protrudes insufficiently from the cannula, then the instrument set can be inserted, but the guidance and penetration capability at the surgical site is reduced
Solution Approach 1:
The patent changes the geometric parameters of the stylet distal end by providing a tapered transition portion that extends beyond the cannula distal end. This creates an optimized protrusion length that provides sufficient guidance and penetration capability while maintaining a smooth transition profile.
Data Source
AI summary
In one preferred aspect, a method is provided for inserting an instrument set having a tapered configuration into a patient. In another preferred aspect, a method is provided for inserting a cannula having an external threaded portion into bone. In yet another preferred aspect, a method is provided for forming and enlarging an opening in bone.