Pivoting Collet Interface for Surgical Pin Alignment
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Solution Overview
Problem
Existing surgical tools face challenges in efficiently and effectively aligning and engaging pins or wires due to misalignment issues with collets, leading to procedural delays and reduced satisfaction.
Innovation Solution
A locking interface between a driveshaft and collet that allows the collet to pivot within a bore, featuring a retaining insert and a pivot point, enabling flexible alignment and reducing binding, utilizing standard components for manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the collet is rigidly engaged with the driveshaft, then the structural stability is improved, but the alignment precision deteriorates due to binding and misalignment
Solution Approach 1:
The collet is designed to pivot within the bore of the driveshaft about a pivot point, transforming the rigid static connection into a dynamic adjustable connection. This allows the collet to self-align with pins or wires during insertion, eliminating binding while maintaining structural stability through the retaining insert that prevents excessive movement.
2Stability of the object's composition
If the collet is rigidly engaged with the driveshaft, then the structural stability is improved, but the ease of operation deteriorates due to misalignment issues
Solution Approach 1:
The pivotable connection allows the collet to dynamically adjust its position during the loading operation, enabling surgeons to easily insert pins or wires without precise pre-alignment. The retaining insert maintains structural stability while the pivot point provides operational flexibility, eliminating procedural delays.
3Manufacturing precision
If the collet is allowed to pivot freely within the bore, then the alignment precision is improved, but the structural stability deteriorates due to reduced constraint
Solution Approach 1:
The retaining insert provides localized constraint at the proximal engagement portion of the collet, allowing free pivoting for alignment purposes while preventing excessive movement that would compromise structural stability. This creates different degrees of freedom in different locations of the same component.
Solution Approach 2:
The system transitions from a fully constrained rigid connection to a semi-constrained dynamic connection where the collet can pivot within limited bounds. The retaining insert defines the boundaries of this dynamic range, providing stability when needed while allowing alignment flexibility.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A wire or pin driver for a rotary surgical tool includes a driveshaft having a bore and extending along a longitudinal axis and a collet forming a cannula. The cannula extends from a proximal engagement portion disposed in the bore to a distal gripping end configured to engage an elongated shaft. At least one retaining insert extending between and engaging the proximal engagement portion of the collet and the driveshaft in the bore.