Triangulation Bar Assembly for Precise 3D Vertebrae Rectification
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Solution Overview
Problem
Existing lumbar vertebrae rectification systems face challenges with precise 3-dimensional corrections due to difficulties in bending connecting rods and potential damage to pedicle screws, especially in osteoporotic bones, and multiaxial screws require complex and unsatisfactory techniques.
Innovation Solution
A triangulation bar assembly with bone anchoring means and adjustable correction instruments forms a rigid triangular attachment, allowing precise sagittal, coronal, and transverse corrections without damaging the bone anchorages, using a triangulation bar with connectors and adjustable angular positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If connecting rods are bent to adapt to vertebral deformation, then the system can accommodate pronounced vertebral deformation, but the bending operation becomes increasingly difficult and imprecise
Solution Approach 1:
The connecting rod is segmented into multiple modular sections that can be independently positioned and connected. This allows the rod to adapt to pronounced vertebral deformation through modular assembly rather than continuous bending, maintaining precision while accommodating complex spatial configurations.
Solution Approach 2:
The solution transitions from 2D bending (curving the rod in a single plane) to 3D spatial configuration using modular sections that can be oriented in multiple dimensions. This allows precise adaptation to complex vertebral deformations by positioning segments in three-dimensional space rather than relying on planar bending.
2Manufacturing precision
If corrective forces are directly applied to pedicle screws for significant correction, then vertebrae rectification is achieved, but the quality of anchorage deteriorates and screws may be torn out
Solution Approach 1:
A triangular assembly structure acts as an intermediary between the correction forces and the pedicle screws. This rigid triangular framework distributes corrective forces across multiple anchor points and structural elements rather than concentrating them on the screws, allowing significant vertebral rectification while preserving screw anchorage quality.
Solution Approach 2:
The triangular assembly is pre-configured with optimized force distribution geometry before application. The rigid triangular structure is designed in advance to channel and distribute corrective forces through its geometric configuration, preventing excessive localized stresses on the pedicle screws during the rectification process.
3Adaptability or versatility
If multiaxial pedicle screws are used to overcome monoaxial limitations, then correction capacity is increased, but the techniques become heavy-handed, long, and complicated
Solution Approach 1:
The correction function is segmented from the pedicle screws and embodied in the separate triangular assembly structure. This allows multiaxial correction capability to be achieved through the modular triangular framework rather than requiring complex multiaxial screw mechanisms, simplifying the overall surgical technique while maintaining multi-dimensional correction capacity.
Solution Approach 2:
The triangular assembly serves as an intermediary structure that provides multiaxial correction capability without requiring multiaxial pedicle screws. This mediator structure simplifies the system by decoupling the correction function from the anchoring function, allowing each to be optimized independently and reducing overall procedural complexity.
4Reliability
If monoaxial pedicle screws are used for precise anchorage, then screw-vertebrae attachment quality is ensured, but precise 3-dimensional vertebrae corrections cannot be systematically achieved
Solution Approach 1:
The rigid triangular assembly acts as an intermediary structure that translates simple monoaxial screw anchorage into precise 3-dimensional correction capability. The triangular geometry provides inherent spatial definition and rigidity, allowing accurate positioning and correction in multiple dimensions while maintaining attachment quality through simple monoaxial screw fixation.
Solution Approach 2:
The solution transitions from 1D monoaxial screw fixation to 3D correction capability through the triangular assembly structure. The rigid triangle provides inherent spatial definition in three dimensions, allowing precise control of vertebral position in sagittal, coronal, and transverse planes while maintaining simple monoaxial anchoring at each vertex.
Data Source
AI summary
An assembly for rectifying vertebrae, comprises: two bone anchoring means intended to be implanted on a same vertebra, a triangulation bar and a connection means for connecting the triangulation bar to each bone anchoring means and for holding the bone anchoring means in a given position in order to form, with the triangulation bar connected to the bone anchoring means by means of the connection means, a rigid triangular assembly, the triangulation bar comprising an attachment area for attaching a correction instrument arranged to ensure a rigid attachment in rotation and in translation of the correction instrument on the triangulation bar.