Bone Screw With Independent Rotation For Compression
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Solution Overview
Problem
Current spinal fusion procedures require invasive incisions for screw and cage placement, leading to significant tissue disruption and limited precision in compression and distraction maneuvers during spine stabilization operations.
Innovation Solution
A bone screw design featuring a threaded proximal and distal piece with an inner post, allowing for separate rotation of each piece and enabling minimally invasive procedures with precise control over compression and distraction through a system of non-cylindrical receptacles and a threaded outer sleeve, facilitating bone fusion and stabilization with reduced tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional open incision methods are used for screw and cage placement, then structural stability can be achieved, but tissue disruption is significant
Solution Approach 1:
The bone screw is divided into multiple separable components including a proximal piece with threads, a distal piece with threads, and an inner post. These segments can be inserted through minimal incisions and assembled within the bone structure, eliminating the need for large open incisions while maintaining structural integrity through threaded engagement of the segments.
Solution Approach 2:
The inner post is inserted within the distal piece, which is itself threaded into the proximal piece. This nested configuration allows all components to be delivered through a single minimal incision site, reducing tissue disruption while ensuring stable fixation through the hierarchical assembly of nested elements.
2Measurement precision
If separate rotation of proximal and distal pieces is enabled, then precision in compression and distraction is improved, but device complexity increases
Solution Approach 1:
The proximal piece and distal piece are designed with independent rotational capability relative to each other through the inner post mechanism. This dynamic design allows the surgeon to rotate each piece separately to achieve precise control over compression and distraction forces, transforming a static single-unit screw into a dynamically adjustable system.
Solution Approach 2:
The independent rotation capability adds a rotational degree of freedom to the traditional linear screw mechanism. By enabling separate rotation of proximal and distal pieces around the inner post axis, the system gains an additional dimensional control parameter for precise compression and distraction maneuvers.
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
Enables minimally invasive bone fusion and stabilization with predictable compression/distraction forces and distances, reducing tissue disruption and improving procedural efficiency while maintaining structural integrity.
Implementation Method 1
a bone screw including a threaded proximal piece, a threaded distal piece
Implementation Method 2
The proximal piece is configured to be rotated separately from the distal piece via engagement of the first non-cylindrical receptacle, and the distal piece is configured to be rotated separately from the proximal piece via engagement of the second non-cylindrical receptacle
Implementation Method 3
The inner post includes a shaft that extends through the central lumen of the proximal piece and is fixedly attached to the distal piece
Data Source
AI summary
A method and system for performing bone fusion and/or securing one or more bones, such as adjacent vertebra, are disclosed. The screw includes a threaded distal piece fixedly attached connected to an inner post. Both the inner post and the proximal piece have non-cylindrical receptacles at their proximal ends for engagement with driving tools. Independent rotation of the proximal piece and the distal piece enables for compression or decompression to modify the gap between two bones or bone fragments. During use, the distal piece of the bone screw is placed at least partially within a distal bone, the proximal piece is placed at least partially within a proximal bone, and one of two pieces is rotated while the other is held in a fixed position, causing movement of the proximal and distal bones relative to each other.