Segmented Spinal Retraction Device for Minimally Invasive Access
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Solution Overview
Problem
Invasive surgical techniques for accessing spinal surgical sites can cause tissue necrosis and creep, necessitating the development of less invasive methods for retraction during spinal surgery.
Innovation Solution
A retractor device with a ring and arm assemblies that can be actuated to move blades from a closed to an open position, featuring a ratcheting mechanism for one-way rotation and removable blades, allowing for dual-stage retraction and minimally invasive access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If invasive surgical techniques are used to access spinal surgical sites, then access to the surgical site is achieved, but tissue necrosis and creep occur
Solution Approach 1:
The retractor device is divided into multiple independent arm assemblies (first pair and second pair) that can be actuated separately. Each arm assembly can be independently controlled to provide staged retraction, allowing gradual tissue displacement rather than sudden invasive retraction, thereby reducing tissue damage
Solution Approach 2:
The retractor device employs a dynamic actuation system with actuators that can control the arm assemblies in different stages. The system transitions from a static invasive approach to a dynamic controlled retraction process, where the degree of retraction can be adjusted in real-time to minimize tissue harm while maintaining surgical access
2Ease of operation
If traditional retractor devices are used, then tissue retraction is achieved, but tissue strain is excessive
Solution Approach 1:
The retraction force is distributed across multiple arm assemblies rather than applied by a single structure. The first and second pairs of arm assemblies can be actuated independently to distribute and control the mechanical load on tissues, reducing peak strain forces while achieving adequate retraction
Solution Approach 2:
The device allows control over the degree and timing of retraction through independent actuation of different arm assemblies. By changing the parameters of retraction (timing, degree, distribution), the system achieves effective tissue exposure while minimizing excessive strain on any single tissue region
Data Source
AI summary
The present disclosure generally relates to a retractor device for retracting soft tissue to provide access to a surgical site. The retractor device includes a plurality of arms coupled to a frame and operatively coupled to a ring disposed at least partially within the frame. Related methods of using the retractor device are also described.