Cervical Retractor Pivot Mechanism for Tissue Pressure Reduction
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Solution Overview
Problem
Current cervical retractors face challenges such as fixed retractor blades that cannot adjust with tissue movement, leading to pressure points and handling difficulties, and retractors with many moving parts that complicate correct alignment during procedures.
Innovation Solution
The cervical retractor design features a base arm and moving arm with pivot links and friction mechanisms to maintain alignment, allowing for adjustable retractor blades that self-align and reduce pressure on tissues, along with articulating arm connectors for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If retractor blades are fixed in a single position, then the retractor structure is simple and easy to manufacture, but the retractor cannot adjust with tissue movement causing pressure points and potential morbidity
Solution Approach 1:
The retractor blade is designed to be movable relative to the retractor body through a pivot mechanism, allowing it to dynamically adjust its position and orientation as tissue is retracted. This dynamic capability enables the blade to adapt to tissue movement and maintain optimal contact without creating pressure points, while the pivot mechanism ensures controlled movement that prevents harmful forces on surrounding tissue.
2Adaptability or versatility
If retractor blades are free to rotate relative to the retractor body, then the retractor can adapt to tissue movement, but correct alignment during deployment becomes challenging
Solution Approach 1:
The retractor blade incorporates a self-aligning mechanism through its pivot connection design, where the blade automatically orients itself to the correct angle and position relative to the retractor body as it is inserted and deployed. The pivot mechanism is configured so that the blade naturally assumes the proper alignment without requiring manual adjustment or complex alignment procedures, making the deployment process straightforward while maintaining adaptability to tissue movement.
3Adaptability or versatility
If retractors have many parts that are free to move relative to each other, then the retractor can achieve desired position, but handling outside the body becomes difficult
Solution Approach 1:
The retractor is divided into distinct modular components including the retractor body, movable blade, pivot mechanism, and articulating arm connectors, each with a specific function. The segmentation allows for simplified handling of individual components during insertion while maintaining the ability of the assembled retractor to achieve precise positioning. The modular design reduces complexity during handling compared to monolithic structures with multiple integrated moving parts.
4Ease of operation
If retractor blades are fixed, then handling is simple, but pressure points arise causing unnecessary morbidity
Solution Approach 1:
The movable pivot connection enables the retractor blade to dynamically adjust its position and orientation in response to tissue resistance and movement during retraction. This dynamic capability allows the blade to maintain optimal contact with tissue surfaces, distributing forces more evenly and preventing concentration of pressure at fixed points, thereby reducing the risk of tissue injury and morbidity while preserving ease of handling through the pivot mechanism's controlled movement.
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
This design enhances the ability to create a clear operative corridor by reducing tissue pressure and improving handling, allowing for more precise and effective retraction during cervical spine procedures.
Implementation Method 1
pivot links and friction mechanisms to maintain alignment
Data Source
AI summary
An anterior cervical retractor comprises a retractor body having a base arm and a moving arm and a pair of retractor blades having a side loading blade and a top loading blade. The base arm includes a first track and a side loading connector. The first track extends perpendicularly from a proximal end of the base arm and the first track includes an articulating arm post and a gear teeth. The moving arm is located opposite to the base arm and includes a first track receptacle and a top loading connector. The moving arm is advanced along the first track by means of a knob extending from the base arm. The side loading blade includes a first blade portion and a first connection post and the top loading blade includes a second blade portion and a second connection post.