Screw-Based Retractor With Articulating Blades
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Solution Overview
Problem
Current screw-based retractors in spinal surgery lack sufficient degrees of freedom and adaptability to accommodate varying patient anatomy, limiting their effectiveness in accessing the surgical site.
Innovation Solution
A screw-based retractor system with modular design, providing up to seven degrees of freedom through a combination of rack and pinion mechanisms, pivot control links, swivel joints, and articulation drive mechanisms, allowing for adjustable blade positions and lengths to accommodate different anatomical conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional retractor with fixed blades is used, then the structure is simple, but the adaptability to different patient anatomy is limited
Solution Approach 1:
The retractor is divided into multiple independent blades that can be individually adjusted in position, angle, and length. Each blade can be independently controlled to accommodate different anatomical variations, allowing the device to adapt to various patient geometries without requiring a completely different retractor design.
Solution Approach 2:
The retractor incorporates dynamic adjustment mechanisms that allow blades to be repositioned during surgery. The blades can be extended, retracted, and angled independently to match the dynamic needs of different surgical scenarios and patient anatomies, transforming a static device into an adaptable system.
Solution Approach 3:
The retractor design integrates multiple functions into a single device, including retraction, distraction, and compression capabilities. The ability to adjust blade positions and angles allows one retractor to serve multiple surgical purposes across different patient anatomies, reducing the need for multiple specialized devices.
2Ease of operation
If the retractor footprint is minimized for ease of handling, then ease of operation improves, but the ability to provide sufficient retraction and access may be compromised
Solution Approach 1:
The retractor blades are designed to nest within each other when not in use, allowing the device to maintain a compact footprint for easy handling and storage. During surgery, the blades can be extended to their full functional length to provide adequate retraction, effectively transitioning from a compact form to an expanded functional form.
Solution Approach 2:
The retractor utilizes vertical expansion of the blades rather than horizontal expansion of the overall device footprint. The blades can extend vertically from a compact base structure, providing sufficient retraction capability while maintaining a small horizontal footprint that is easy to handle and position.
3Manufacturing precision
If fixed blade positions are used, then device complexity is reduced, but the precision of surgical access is limited
Solution Approach 1:
The retractor blades are pre-configured with multiple adjustable positions and locking mechanisms that allow surgeons to set the desired blade angles and positions before surgery begins. This preliminary configuration capability enables precise surgical access to be achieved without requiring complex real-time adjustments during the procedure.
Solution Approach 2:
The design replaces complex mechanical adjustment systems with simpler, more reliable mechanisms such as indexed positioning systems, bayonet connectors, and friction-based locking mechanisms. These substitutions maintain surgical precision while reducing overall device complexity and improving reliability.
Data Source
AI summary
A screw-based retractor comprises an elongate rack having a rack axis, a plurality of arms slidably supported for translational movement on the rack, and a plurality of blades, one each supported by a respective arm at a distal portion thereof. At least one of the arms includes at its distal portion a blade releasably attached thereto. Such blade is attached to a blade receptacle movably attached to the at least one arm in a manner to provide articulation of the blade receptacle and hence the attached blade about an articulation point spaced from and not located on such arm. Such blade is additionally movable relative to the rack in multiple degrees of freedom.