Modular Pedicle Distractor with Interchangeable Elements
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Solution Overview
Problem
Current surgical methods for spinal irregularities, such as collapsed discs, require improved devices for pedicle-based distraction and soft tissue retraction to facilitate access and visualization during procedures like transforaminal lumbar interbody fusion, where minimally invasive techniques demand precise and reliable landmarking and tissue management.
Innovation Solution
A modular pedicle-based distraction assembly with interchangeable distractor elements, including headless posts and pre-assembled posts, that also functions as a retractor, allowing for pedicle-based distraction and medial retraction, utilizing a distraction rack and pinion system to widen the disc space and retract soft tissue, thereby establishing a surgical safe-zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pedicle-based system is used to perform both distraction and retraction functions, then device versatility is improved, but device complexity increases
Solution Approach 1:
The patent combines distraction and retraction functions into a single integrated system. The distraction rack supports both distractor elements (for distraction) and retractor blades (for retraction), allowing both functions to be performed simultaneously through one device rather than requiring separate instruments.
Solution Approach 2:
The distraction rack is designed as a universal platform that can accommodate multiple types of distractor elements and retractor blades. The system provides multi-functionality by enabling the same rack structure to perform both vertebral distraction and soft tissue retraction operations during spinal surgery.
2Adaptability or versatility
If interchangeable distractor elements are used in the modular system, then adaptability is improved, but device complexity increases
Solution Approach 1:
The distractor elements are segmented into interchangeable components that can be independently selected and attached to the distraction rack. This segmentation allows the system to be customized for different surgical needs while maintaining a standardized interface for attachment.
Solution Approach 2:
The system incorporates dynamic configurability through interchangeable distractor elements that can be adjusted, added, or removed based on surgical requirements. The modular design allows the device to adapt its configuration during the procedure rather than being fixed.
3Measurement precision
If the distraction rack and pinion system is used to widen disc space, then distraction precision is improved, but device complexity increases
Solution Approach 1:
The rack and pinion mechanism provides mechanical feedback through engaged teeth that ensure precise, controlled movement of the distractor elements. This gear-based system offers inherent positioning feedback and control, allowing for accurate disc space widening while maintaining a relatively simple mechanical structure.
Data Source
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AI summary
Distractor and retractor systems and methods of using the same are disclosed. A pedicle-based distractor assembly includes a base supporting a distraction rack, a pair of moveable arms coupled to the distraction rack, a connector at the end of each arm, each connector having a through-opening, and a pair of distractor elements each configured to attach to a pedicle screw. Each distractor element may be positioned through the through-opening in the respective connector. The distractor elements are modular such that different types of distractor elements, such as headless posts, pre-assembled posts, or minimally invasive towers, are interchangeable with the connectors. The assembly also includes a retractor assembly with a medial retractor blade (502) for retracting soft tissue. The medial retractor blade (502) has first and second translating components (504, 506) at a distal end for retracting soft tissue, wherein the translating components (504, 506) each are configured to independently move from a first position to a second position.