Clamping Retractor Assembly for Spinal Surgery
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Solution Overview
Problem
Conventional surgical retractors face mechanical disadvantage and instability issues during spinal surgery, particularly when retracting the psoas muscle, leading to inefficient access and potential tissue injury due to suboptimal force application and distribution.
Innovation Solution
A retraction assembly comprising a retractor blade and a second handle inserted through a separate incision, connected within the wound, allowing controlled retraction with an adjustable stop mechanism that engages a plate on the skin surface to resist tissue pull, enabling precise adjustment of retraction force without manual holding or table-mounted stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional retractors with long blades are used to reach deep spinal structures, then access to deep wound structures is improved, but mechanical stability deteriorates due to high moment and cantilever effects
Solution Approach 1:
The patent introduces a second handle inserted through a separate incision that connects to the blade internally, adding a dimensional element perpendicular to the traditional handle-blade alignment. This creates a triangular stabilization structure where the second handle provides counterbalancing support, reducing the cantilever moment on the primary handle while maintaining deep blade insertion for accessing spinal structures.
2Force
If strong mechanisms and materials are used to overcome tissue resistance in deep wounds, then retraction force is improved, but device complexity increases
Solution Approach 1:
The patent extracts the force application function from a complex mechanical mechanism and distributes it across two simple handles that the surgeon can manually control. Instead of using strong mechanisms within the wound, the solution removes the need for complex internal mechanisms by providing external manual control through two handles, simplifying the device while maintaining adequate retraction force.
3Stability of the object's composition
If dual or multi-bladed retractors are used to apply spreading forces for stability, then retractor stability is improved, but tissue injury increases due to force applied to wound edges
Solution Approach 1:
The patent introduces an intermediary counterforce plate that contacts the skin surface to resist retraction forces. This plate acts as a mediator between the retractor blade and the patient's body, providing stability through counterbalancing force rather than through spreading forces on wound edges. The plate distributes the counterforce across a larger skin area, preventing tissue injury while maintaining retractor stability.
4Stability of the object's composition
If table-mounted mechanisms with long mechanical arms are used to stabilize deep retractors, then retractor stability is improved, but mechanical efficiency deteriorates due to distance from fixation to force application
Solution Approach 1:
Instead of fixing the retractor to the table and applying force from a distance, the patent inverts the approach by having the surgeon directly hold and control the blade through a handle inserted through the incision. This places the force application point adjacent to the wound, eliminating the mechanical inefficiency of long arms while maintaining stability through direct surgical control.
Data Source
AI summary
An assembly for retracting soft tissue in a surgical incision is provided, the assembly including a supporting member having first and second ends; a retractor blade having a first distal end and a second proximal end retained at the first end of the support member; a retaining arm which co-operates with the support member and receives and supports a clamping assembly; and an adjusting assembly which engages the support member and allows the clamping assembly to advance and retract relative to the retractor blade.