Tissue Retractor Blade Alignment With Flanged Guide Body
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Solution Overview
Problem
Existing tissue retractors face challenges in maintaining alignment and preventing tissue creep during spinal surgery, leading to increased trauma and obscured surgical views due to splaying and misalignment of retractor blades.
Innovation Solution
The use of an elongate body with a polygonal profile and internal round channel, featuring flanges that engage slotted tracks in tissue retractor blades, along with a design that allows for the insertion of dilators and neuromonitoring devices, and a shim deployment mechanism to maintain blade alignment and provide space for additional instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional retractors are used to create surgical opening, then tissue access is improved, but blade splaying and misalignment occur causing increased tissue trauma and obscured surgical view
Solution Approach 1:
A guide wire is introduced as an intermediary element that the retractor blades engage with during insertion. The guide wire maintains a predetermined path and spacing between blades, preventing splaying and misalignment while allowing the blades to be inserted through tissue. This mediator ensures reliable blade alignment throughout the surgical procedure.
Solution Approach 2:
The guide wire is positioned through the tissue and into the target area before the retractor blades are inserted. This preliminary action establishes the correct spatial relationship and alignment path for the blades, ensuring they follow the predetermined trajectory and maintain proper spacing from the start of insertion.
2Ease of operation
If retractors are inserted through tissue, then surgical access is achieved, but tissue necrosis and creep occur
Solution Approach 1:
The retractor system is divided into separate functional components: the guide wire for guidance and alignment, the blades for tissue retraction, and the shaft for transmission of forces. This segmentation allows each component to be optimized independently, with the guide wire minimizing tissue damage during insertion and the blades providing controlled retraction forces.
Solution Approach 2:
The traditional single-piece retractor design is replaced with a system that uses a guide wire to establish the insertion path and maintain blade alignment, substituting the mechanical guidance function of a solid shaft with a flexible wire that can be steered and positioned more precisely, reducing mechanical trauma to tissues.
3Illumination intensity
If retractor blades are inserted to maintain spacing, then surgical view is improved, but blades splay and misalign during insertion
Solution Approach 1:
The guide wire serves as a mediator that transmits the spacing and alignment information to the retractor blades. The blades engage with the guide wire at specific points, maintaining a predetermined spacing and configuration throughout the insertion process, preventing splaying and misalignment while ensuring proper blade orientation for surgical access.
Solution Approach 2:
The guide wire is advanced through the tissue first, establishing the correct spatial relationship and alignment path before the retractor blades are inserted. This preliminary positioning action ensures that when the blades are introduced, they automatically assume the correct configuration and spacing, maintaining stability throughout the procedure.
Data Source
AI summary
Systems, devices, and methods for tissue retraction include one or more instruments operatively couplable for retracting and/or retaining tissues or other materials during a procedure. In one aspect, a first instrument includes an elongate rigid body having a longitudinal axis extending from a proximal end to a distal end. The elongate rigid body has an outer polygonal profile and an interior surface defining a round channel extending along the longitudinal axis. The round channel may receive a tubular instrument therethrough. The elongate rigid body includes one or more sets of flanges protruding from lateral sides of the outer polygonal profile. The flanges positively engage one or more respective tracks of a tissue retraction blade. Additional instruments may be provided that operatively couple to the first instrument and/or to one or more tissue retractor blades, for example while the first instrument is coupled to the tissue retractor blades.