Bone Anchoring Assembly With Interchangeable Rods and Dual Locking
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Solution Overview
Problem
Existing bone anchoring devices lack versatility and have a complex structure with numerous components, limiting their application and increasing surgical steps.
Innovation Solution
A bone anchoring assembly with interchangeable closure elements that allow for versatile use with rods of different diameters, featuring a first closure element for simultaneous locking and fixation, and a second closure element for independent or sequential locking and fixation, reducing the number of components and simplifying surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple closure elements with different locking mechanisms are provided for versatile applications, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a receiving part that can accommodate multiple types of closure elements (first closure element with simultaneous locking mechanism, second closure element with independent/sequential locking mechanism) through a universal interface. This allows a single bone anchoring device to perform multiple locking functions by simply changing the closure element, rather than designing separate devices for each locking mechanism type.
Solution Approach 2:
The system allows dynamic selection between different locking mechanisms (simultaneous locking vs. independent/sequential locking) based on surgical requirements. The receiving part is designed to accept different closure element types, enabling the surgeon to choose the appropriate locking mechanism for each specific application scenario.
2Adaptability or versatility
If rods of different diameters are used interchangeably, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The receiving part features a channel with specific geometric characteristics (cross-sectional shape, surface finish, dimensional tolerances) that are optimized to accommodate rods of different diameters. The channel's local geometric properties ensure proper fit and function for various rod sizes while maintaining consistent performance across the range of interchangeable rods.
3Device complexity
If a single receiving part design is used for multiple rod diameters, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The receiving part is designed as a universal component that can receive and accommodate multiple rod diameters through its channel structure. This single universal receiving part replaces what would otherwise require multiple specialized receiving parts for different rod sizes, reducing overall device complexity while maintaining functionality across various rod configurations.
Data Source
AI summary
An anchoring assembly for anchoring a rod to a bone or vertebra includes a shank and a receiving part pivotably connected to one another, the receiving part defining a channel for the rod, a pressure element for locking the shank with the receiving part, first and second rods with different diameters configured to be interchangeably received in the channel, and first and second closure elements configured to interchangeably cooperate with the receiving part. The first closure element acts on the selected rod in the receiving part such that the rod exerts pressure on the pressure element to simultaneously lock the shank with the receiving part and fix the rod in the channel. The second closure element cooperates with the receiving part to act on the pressure element to lock the shank with the receiving part, and to act separately on the selected rod to fix the rod in the channel.