Screw-Based Retractor With Selectively Lockable Articulating Blades
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Solution Overview
Problem
Current screw-based retractors in spinal surgery lack sufficient degrees of freedom for enhanced user applicability, particularly in scenarios where patient anatomy hinders blade placement and vertebral body distraction.
Innovation Solution
A screw-based retractor system with up to seven degrees of freedom, incorporating a modular design with articulating blades and pedicle screw attachment, allowing for adjustable positions and orientations to accommodate varying anatomical conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a screw-based retractor with fixed blade positions is used, then the device structure is simple and easy to manufacture, but the adaptability to varying patient anatomy is limited
Solution Approach 1:
The retractor blades are designed with multiple discrete selectable positions along the retractor arm, allowing dynamic adjustment to match varying patient anatomy. Each blade can be positioned at different locations and locked in place, transforming a static structure into a dynamically adaptable one without requiring continuous adjustment mechanisms.
Solution Approach 2:
The retractor blade is divided into multiple discrete position segments along its length. Instead of a continuous adjustable blade, the blade has predetermined position stops or locking points that allow it to be positioned at specific intervals and secured. This segmentation provides adaptability while maintaining structural simplicity.
2Adaptability or versatility
If the retractor blades are made rigid and fixed in position, then the device is structurally simple and stable, but the ability to accommodate complex anatomical structures is reduced
Solution Approach 1:
The blade positioning system allows the rigid blade to be dynamically repositioned along the retractor arm to different discrete locations. The blade itself remains rigid for structural stability, but its position along the arm is dynamic and selectable, enabling accommodation of complex anatomy while maintaining blade rigidity.
Solution Approach 2:
The retractor arm incorporates multiple discrete positioning points or locking mechanisms at specific intervals. The rigid blade can be secured at any of these segmented positions, providing flexibility for different anatomical configurations while maintaining the structural integrity and stability of both the blade and positioning system.
3Adaptability or versatility
If the retractor is designed with minimal footprint for ease of handling, then the device is easy to manipulate during surgery, but the degrees of freedom for blade placement are limited
Solution Approach 1:
The retractor arm features multiple discrete positioning points distributed along its length, creating segmented zones for blade placement. This segmentation increases the degrees of freedom for blade placement without requiring a proportionally larger overall device footprint, as the positions are distributed efficiently along the existing arm structure.
Solution Approach 2:
The blade can be dynamically repositioned to multiple discrete locations along the retractor arm, increasing operational flexibility. This dynamic positioning capability is achieved through a compact locking mechanism that allows the blade to be secured at different positions without significantly increasing the overall device footprint.
4Manufacturing precision
If conventional retractors without selective locking positions are used, then the device is simple to operate, but the precision of blade positioning for optimal retraction is reduced
Solution Approach 1:
The retractor arm incorporates multiple discrete positioning points or locking zones at specific intervals along its length. The blade can be positioned at any of these predetermined locations and locked in place, providing precise positioning control. The segmented design with clear stopping points makes the positioning process intuitive and easy to operate.
Solution Approach 2:
The blade positioning system allows dynamic adjustment to multiple discrete positions with locking capability. Each position provides precise control for optimal retraction, while the simple locking mechanism maintains ease of operation. The dynamic nature of the system allows the surgeon to select and secure the blade at the precise location needed for each surgical scenario.
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 at least one arm comprises a plurality of links each of which is configured to allow the blade supported by such arm to be moved in plural incrementally discrete positions with each such discrete position being selectively lockable. The blade may have a fixed or variable length. Such blade may be 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.