Bone Anchor Receiving Part With Three-Position Pressure Locking
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Solution Overview
Problem
Existing bone anchoring systems require complex designs with multiple parts, making them difficult to handle during surgery and increasing manufacturing costs.
Innovation Solution
A receiving part with a pressure element that can assume three positions: insertion, pre-locking, and locking, allowing safer and more convenient handling by reducing the number of components and using a single element for pre-locking and final locking, facilitating assembly with a modular system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple parts are used in bone anchoring systems, then the functionality and reliability are improved, but the device complexity increases and handling becomes more difficult
Solution Approach 1:
The patent combines the pre-locking and final locking functions into a single pressure element. The pressure element can be positioned in three locations: insertion position (allowing head removal), pre-locking position (clamping the head), and locking position (final securement). This merging of functions reduces the number of separate components needed while maintaining reliable locking capability throughout the surgical procedure.
Solution Approach 2:
The pressure element serves multiple functions: it acts as a clamp during insertion, provides pre-locking to prevent inadvertent removal, enables final locking, and allows for controlled head removal when needed. This multi-functional design eliminates the need for separate pre-locking and final-locking mechanisms, reducing overall device complexity.
2Reliability
If multiple parts are used in bone anchoring systems, then the locking mechanism is more reliable, but the ease of operation deteriorates
Solution Approach 1:
By merging pre-locking and final-locking into a single pressure element with three positional states, the system maintains reliable locking while simplifying operation. The surgeon controls the entire locking sequence through a single element rather than managing multiple separate mechanisms, improving ease of operation during the procedure.
Solution Approach 2:
The pressure element transitions dynamically between three positions to provide different levels of locking control. This dynamic positioning allows the system to adapt between insertion mode, pre-locking mode, and final locking mode, making the device easier to operate while maintaining reliability at each stage.
3Reliability
If a complex design with multiple parts is used, then the locking capability is enhanced, but the manufacturing cost increases
Solution Approach 1:
The patent merges pre-locking and final-locking functions into a single pressure element, reducing the total number of components that need to be manufactured, assembled, and quality-checked. This consolidation lowers manufacturing costs while maintaining enhanced locking capability through the multi-position design of the single element.
Solution Approach 2:
The pressure element is designed as a universal component that performs multiple locking functions. This multi-functionality reduces the bill of materials and assembly complexity, directly reducing manufacturing costs while providing reliable pre-locking and final-locking capabilities.
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 design simplifies surgical handling, reduces manufacturing costs, and enhances safety by securely clamping the bone anchoring element with fewer parts, enabling easier assembly and adaptation during surgery.
Implementation Method 1
The pressure element has a flexible portion to clamp the head. The pressure element can assume in the receiving part body an insertion position in which introduction and removal of the head is permitted, a locking position in which the head is locked in the receiving part, and a pre-locking position in which the head is clamped by a pre-stress exerted by the pressure element.
Data Source
AI summary
A receiving part for receiving a rod for coupling the rod to a bone anchoring element, the receiving part including: a receiving part body having a channel for receiving a rod and defining an accommodation space for accommodating a head of a bone anchoring element, the accommodation space having an opening for inserting the head; and a pressure element at least partially in the accommodation space, the pressure element including a first portion having a recess to receive the rod, and a second portion having a flexible portion to clamp the head, wherein the pressure element is moveable along a longitudinal axis of the receiving part body from an inserting position to insert the head, to a pre-locking position to clamp the head in the receiving part by a pre-stress exerted by the pressure element, to a locking position to lock the head in the receiving part.