Bone Anchoring Receiving Part Curved Locking Ring
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Solution Overview
Problem
Existing bone anchoring devices are large in size, making them unsuitable for minimally invasive applications, and they require significant force to securely lock the head, which complicates handling and increases manufacturing costs.
Innovation Solution
A compact bone anchoring device with a receiving part that clamps the head circumferentially from the lateral sides using a locking ring with a curved interior surface, reducing the necessary clamping force and device size, allowing for modular systems and easier handling, particularly in cervical spinal surgery and pediatric applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bone anchoring devices are used, then reliable locking of the head is achieved, but the device size becomes large and requires significant clamping force
Solution Approach 1:
The locking ring features a curved interior surface that contacts the tapered exterior surface of the head receiving portion, creating a conforming contact interface. This curvature allows for more efficient force distribution and reduces the overall clamping force needed to achieve secure locking, thereby reducing device size while maintaining reliability
Solution Approach 2:
The invention changes the geometric parameters of the locking interface by introducing a tapered exterior surface on the head receiving portion that works in conjunction with the curved interior surface of the locking ring. This parameter change optimizes the mechanical advantage of the clamping action, reducing the force required while maintaining secure locking
2Reliability
If conventional bone anchoring devices are used, then secure locking is achieved, but the clamping force required is high complicating handling
Solution Approach 1:
The curved interior surface of the locking ring conforming to the tapered exterior surface creates an optimized force distribution pattern. This geometric configuration reduces stress concentrations and allows for more efficient force transmission, reducing the overall clamping force needed while maintaining secure locking
Solution Approach 2:
The locking mechanism is segmented into distinct functional surfaces: the tapered exterior surface on the head receiving portion and the curved interior surface on the locking ring. This segmentation allows each surface to be optimized for its specific function, with the tapered surface providing mechanical advantage and the curved surface providing conforming contact, together reducing the required clamping force
3Reliability
If conventional bone anchoring devices are used, then adequate locking is achieved, but manufacturing costs increase
Solution Approach 1:
The invention merges the head receiving portion and the locking ring into an integrated structure where the tapered exterior surface and curved interior surface work together as a unified locking system. This merging reduces the number of separate components that need to be manufactured and assembled, thereby reducing manufacturing complexity and cost while maintaining adequate locking
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 safe and secure locking mechanism with reduced size and force requirements, facilitating smaller device dimensions and lower manufacturing costs, suitable for minimally invasive procedures and modular systems.
Implementation Method 1
The curved portion of the locking ring presses against the tapered portion of the exterior surface of the head receiving portion to compress the head receiving portion and 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 rod receiving portion with a channel for receiving a rod, and a head receiving portion for accommodating a head of a bone anchoring element, the head receiving portion having an open end and being flexible so as to allow introduction and clamping of the head, the head receiving portion having an exterior surface with a tapered portion; and a locking ring around the head receiving portion and including an interior surface with a curved portion configured to engage the tapered portion of the exterior surface of the head receiving portion to clamp the head.