Bone Screw Receiving Part With Bottom-Inserted Pressure Element
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Solution Overview
Problem
Existing bone screw systems for coupling to a rod are complex, with multiple parts and lack a streamlined design for improved handling during surgery.
Innovation Solution
A receiving part with a slim design pressure element that can be introduced from the bottom, featuring a U-shaped recess for the rod and an accommodation space for the bone anchoring element head, allowing for a low-profile and improved handling with fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing bone screw systems are used for coupling to a rod, then the coupling function is achieved, but the system becomes complex with multiple parts and poor handling during surgery
Solution Approach 1:
The patent combines multiple separate components into a single integrated receiving part. The receiving part integrates the rod coupling function, the head accommodation space, and the pressure element mechanism into one unified component, eliminating the need for multiple separate parts and simplifying the overall assembly.
Solution Approach 2:
The receiving part serves multiple functions simultaneously: it receives and couples the rod, accommodates the bone anchoring element head, and provides the pressure element mechanism for securing the head. This multi-functionality reduces the number of separate components needed in the system.
2Device complexity
If a traditional pressure element design is used, then the head can be clamped, but the design requires additional components for holding the pressure element in position
Solution Approach 1:
The receiving part body includes an internal end stop that automatically positions and holds the pressure element in its insertion position. The pressure element utilizes this built-in feature for positioning without requiring any additional external components, achieving self-positioning and self-holding functionality.
3Strength
If the pressure element is designed with sufficient wall thickness for strength, then structural integrity is maintained, but the profile becomes large and handling is difficult
Solution Approach 1:
The pressure element features a slim design with optimized wall thickness distribution. Rather than uniform thick walls throughout, the design provides sufficient thickness only where structurally necessary while maintaining thin walls in other areas, achieving a low-profile overall shape that is easy to handle while preserving structural integrity where needed.
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 solution provides a low-profile, high-stiffness design with fewer parts, enhancing surgical handling and stability through a simplified assembly process.
Implementation Method 1
a second section having a flexible portion to clamp the head
Data Source
AI summary
A receiving part for receiving a rod for coupling the rod to a bone anchoring element includes a receiving part body including a first end and a second end, and having a substantially U-shaped recess at the first end forming a channel for receiving the rod, and an accommodation space for accommodating a head of the bone anchoring element, the accommodation space having an opening at the second end for introducing the head; and a pressure element arranged at least partially in the accommodation space, the pressure element including a first section having a second recess for receiving the rod, and a second section having a flexible portion to clamp the head, the first section and the second section being fixed relative to each other, wherein said pressure element is insertable from the opening.