Polyaxial Vertebral Anchor With Pivotable Ring
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Solution Overview
Problem
Current vertebral osteosynthesis equipment faces challenges in transmitting corrections to vertebrae while maintaining easy engagement of connecting bars, with monoaxial anchor members providing perfect correction but difficult engagement, and polyaxial members facilitating engagement but imperfectly transmitting corrections.
Innovation Solution
A polyaxial anchor member with a pivotable ring that allows for easy bar engagement by pivoting between two angular positions, enabling both polyaxial and monoaxial functionality, ensuring precise correction transmission without hindering bar placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If monoaxial anchor members are used, then perfect transmission of corrections to vertebrae is achieved, but engagement of connecting bars in the duct becomes difficult
Solution Approach 1:
The anchor member head is designed to be dynamically adjustable between two configurations: locked (monoaxial) and unlocked (polyaxial). The ring element can pivot between positions to either constrain or allow rotation of the spherical articulation, enabling the system to adapt its degree of freedom based on operational needs.
Solution Approach 2:
The system changes the parameter of articulation freedom by using a ring element that can pivot between positions. When the ring is in the first position, it allows polyaxial movement; when in the second position, it constrains movement to monoaxial alignment, thereby changing the operational parameter of the anchor member.
2Ease of operation
If polyaxial anchor members are used, then easy engagement of connecting bars is achieved, but perfect transmission of corrections to vertebrae is compromised
Solution Approach 1:
The anchor member head is designed to be dynamically adjustable between two configurations: locked (monoaxial) and unlocked (polyaxial). The ring element can pivot between positions to either constrain or allow rotation of the spherical articulation, enabling the system to adapt its degree of freedom based on operational needs.
Solution Approach 2:
The system changes the parameter of articulation freedom by using a ring element that can pivot between positions. When the ring is in the first position, it allows polyaxial movement; when in the second position, it constrains movement to monoaxial alignment, thereby changing the operational parameter of the anchor member.
3Ease of operation
If both monoaxial and polyaxial anchor members are used on the same assembly, then both engagement ease and correction transmission are addressed, but placement complexity and correction performance become much more difficult
Solution Approach 1:
The anchor member is designed as a universal component that can perform both monoaxial and polyaxial functions. The head assembly with the pivotable ring allows the same anchor member to adapt to different operational requirements, eliminating the need for separate monoaxial and polyaxial anchor member types.
Solution Approach 2:
The anchor member head is segmented into separable components: a body with a spherical articulation, a head with an engagement duct, and a pivotable ring element. This segmentation allows the ring to be independently positioned to achieve either locked or unlocked configurations, providing functional versatility through modular design.
Data Source
AI summary
The equipment (1) includes at least one connecting bar and at least one anchor member (1) of the “tulip” type and of the so-called “polyaxial” type. According to the invention, the head (3) forms an articulation portion (15). The body (2) forms an articulation cavity (8) for receiving the articulation portion (15), defined by a bearing wall (9). The anchor member (1) includes a ring (20) bearing against said bearing wall (9). The ring (20) and a distal bearing surface of the head (3) includes inter-engagement means (16, 21) having, in a first angular position of the ring (20), a first inter-engagement position of the ring (20) in which play exists between the ring (20) and the bearing wall (9), and having, in a second angular position of the ring (20), a second inter-engagement position in which said play is eliminated such that the head (3) is made immobile, or substantially immobile, relative to the body (2).