Bone Anchor Receiving Part With Bottom-Inserted Pressure Element
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Solution Overview
Problem
Existing bone anchoring devices have complex designs with multiple parts, leading to challenges in handling during surgery and requiring additional components for maintaining the pressure element in position.
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, with an internal stop for positioning and a flexible section for clamping, reducing the number of parts and enhancing handling during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex design with multiple parts is used for the bone anchoring device, then the functionality and reliability are improved, but the device complexity and handling difficulty increase
Solution Approach 1:
The pressure element is integrated directly into the receiving part body, forming a single unified component. The pressure element includes a first section with a recess for the rod and a second section with a flexible portion for clamping the head, all fixed relative to each other within the receiving part body. This merging eliminates the need for separate components to hold the pressure element in position, reducing the total number of parts while maintaining the clamping functionality.
2Reliability
If additional components are added to hold the pressure element in position, then the reliability of the pressure element positioning is improved, but the device complexity and profile increase
Solution Approach 1:
The receiving part body includes an internal stop that automatically positions the pressure element in the correct insertion position. The stop is formed as an integral part of the receiving part body, creating an abutment that the pressure element rests against. This self-positioning mechanism eliminates the need for additional external components to hold the pressure element in position, reducing device complexity while ensuring reliable positioning.
3Shape
If the pressure element is designed with a slim profile, then the device profile and stiffness are improved, but the ease of insertion and handling may be worsened
Solution Approach 1:
The pressure element is divided into two distinct sections: a first section with a recess for receiving the rod, and a second section with a flexible portion for clamping the head. This segmentation allows the pressure element to be inserted from the bottom through the opening in the receiving part body in a slim, compact form, while still providing the necessary clamping function. The segmented design enables easy insertion despite the functional complexity.
4Strength
If the wall thickness of the receiving part body is increased, then the stiffness and strength are improved, but the device profile and ease of insertion increase
Solution Approach 1:
Instead of inserting the pressure element from the top or side, the design allows insertion from the bottom through an opening in the receiving part body. The pressure element is pushed upward into the receiving part body until it abuts against the internal stop. This inverted insertion approach enables the use of thicker walls in the receiving part body for increased stiffness, while still allowing easy insertion of the slim pressure element from the bottom.
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 improved handling and reduced complexity, allowing for easier assembly and secure locking of the bone anchoring device.
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.