Modular Ratcheted Surgical Retractors for Adjustable Spinal Access
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Solution Overview
Problem
Existing surgical retractors face challenges in providing stable and adjustable access to spinal surgical sites, particularly during lateral approaches, with limited ability to maintain orientation and adjust the surgical corridor effectively.
Innovation Solution
The surgical retractor design includes a base portion with receiving areas for retractor blades, featuring ratchet mechanisms for adjustment, alignment features for proper orientation, and modular blade assemblies to create and enlarge the surgical corridor, allowing for independent adjustment and secure anchoring to the surgical site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If surgical retractors are designed with fixed blade positions, then structural simplicity is maintained, but the ability to adjust the surgical corridor is limited
Solution Approach 1:
The retractor blades are designed with movable connections to the base portion, allowing dynamic adjustment of blade positions and angles. The advancement mechanism enables the blades to be moved from an initial position to an advanced position, transforming the retractor from a static to a dynamic structure that can adapt to different surgical needs.
Solution Approach 2:
The retractor is divided into separate components: a base portion and multiple blade portions that can be independently adjusted. Each blade can be positioned and locked independently through the advancement mechanism, allowing selective adjustment of different parts of the retractor to create customized surgical corridors.
2Reliability
If surgical retractors use simple anchoring mechanisms, then device complexity is reduced, but stability at the surgical site is compromised
Solution Approach 1:
Alignment features are incorporated into the retractor design to ensure proper orientation and positioning before the retractor is fully anchored at the surgical site. These features guide the placement and confirm correct alignment with the target site, preventing mispositioning before final securing.
Solution Approach 2:
The ratchet mechanism provides mechanical feedback by allowing incremental advancement of the blades while preventing backward movement. This one-way locking mechanism ensures that once the blades are positioned and anchored, they maintain their position without requiring continuous active control, providing reliable stability.
3Adaptability or versatility
If surgical retractors are designed for highly adjustable blade positions, then surgical corridor customization is improved, but maintaining orthogonality and parallel orientation becomes difficult
Solution Approach 1:
The blade portions are designed with specific geometric relationships to the base portion, including orthogonal and parallel orientations that are built into the structure. The advancement mechanism maintains these geometric relationships during adjustment, ensuring that even as blade positions change, the critical orthogonality and parallelism are preserved through the constrained degrees of freedom of the mechanism.
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
The retractor system provides stable, adjustable access to spinal surgical sites, maintaining orthogonality and parallel orientation, reducing tissue trauma, and enabling efficient surgical corridor expansion as needed.
Implementation Method 1
Each receiving area may include a ratchet mechanism that engages with and locks the arm portion relative to the base portion.
Data Source
AI summary
Disclosed herein are surgical retractors and methods of using such surgical retractors where the surgical retractors include a base portion and two retractor blades. The base portion has (a) two extensions, each extension having a receiving area, and (b) and one or more engagement portions. Each retractor blade includes both a blade portion with proximal and distal ends and an arm portion extending from the proximal end of the blade portion. Each arm portion is received by a respective receiving area.