Bone Anchor Retractor with Flexible Wire for Spinal Distraction
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Solution Overview
Problem
Current spinal surgery techniques face challenges in minimizing invasive approaches, trauma, pain, and blood loss, particularly in achieving desired spinal correction while allowing for prone patient positioning and lateral access to the intervertebral space.
Innovation Solution
A bone anchor based retractor/distractor assembly utilizing an adjustable, flexible wire to secure bone anchors, featuring modular blades with pivot pins, rotatable knobs, and a release mechanism, allowing for stable engagement and incremental movement to facilitate tissue retraction and disc space distraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional spinal access techniques are used, then spinal correction can be achieved, but patient trauma, pain, and blood loss increase
Solution Approach 1:
The device is divided into modular components including separate blades, bone anchors, and connection elements that can be independently positioned and secured. This segmentation allows for minimal invasive access while maintaining effective spinal correction capability.
Solution Approach 2:
The invention enables lateral access to the intervertebral space, providing a new dimensional approach to spinal surgery that avoids the traditional anterior or posterior approaches, thereby reducing patient trauma while achieving correction.
2Ease of operation
If prone patient positioning is used, then surgical access is simplified, but lateral access to intervertebral space becomes difficult
Solution Approach 1:
The device provides lateral access to the intervertebral space through an innovative approach that works effectively in prone positioning, combining the benefits of prone positioning with lateral access capabilities.
Solution Approach 2:
The blade and bone anchor system acts as an intermediary mechanism that enables lateral access to the disc space while maintaining prone patient positioning, bridging the gap between these two requirements.
3Stability of the object's composition
If rigid fixation devices are used, then spinal stability is improved, but adaptability to different spinal configurations decreases
Solution Approach 1:
The device incorporates adjustable elements including modifiable blade positions and adaptable bone anchor configurations that allow the system to dynamically adjust to different spinal geometries while maintaining stable fixation.
Solution Approach 2:
The system allows for parameter adjustments in blade positioning, angle, and depth to accommodate various spinal configurations, enabling both stability and adaptability through controllable parameter variations.
4Reliability
If complex retraction mechanisms are used, then tissue retraction effectiveness is improved, but device complexity and operating time increase
Solution Approach 1:
The device merges the retraction and distraction functions into a unified blade structure that achieves both tissue retraction and disc space distraction simultaneously, reducing overall device complexity while maintaining effectiveness.
Solution Approach 2:
The blade structure serves multiple functions including retraction, distraction, and stabilization, eliminating the need for separate complex mechanisms for each function and thereby reducing device complexity and operating time.
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 direct visualization and minimally invasive spinal access, reducing trauma and improving recovery outcomes by providing stable engagement and adjustable distraction, thus enhancing surgical precision and reducing operating time and costs.
Implementation Method 1
a threaded draw rod having an adjustment knob for activating movement
Implementation Method 2
A main body is secured to a medial retraction blade by an arm having a gear member operatively associated with a gear knob for incremental movement of the medial retraction blade
Implementation Method 3
a blade connector with a rotatable knob for adjusting of a wire releasably securable to a first bone anchor
Data Source
AI summary
A bone anchor based retractor/distractor assembly for simultaneous tissue retraction and disc space distraction utilizing an adjustable, flexible wire to secure the bone anchors during the distraction process. The assembly includes first and second modular retractor/distractor blades that can be detached for securing to the bone anchor. Each blade has a pivot pin and blade connector with a rotatable knob for adjusting of a wire releasably securable to a bone anchor. The blade connectors are attached to the first and second arm elements, each having a stabilizing arm that is movable in relation to each other by a threaded draw rod having an adjustment knob for activating movement. A main body is secured to a medial retraction blade by an arm having a gear member operatively associated with a gear knob for incremental movement of the medial retraction blade.