Rod Reduction Instrument Segmentation and Ratchet Dynamics
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Solution Overview
Problem
Existing rod reduction instruments for spinal fixation constructs are often bulky, time-consuming, and limited in achievable reduction depth, making them inefficient for aligning and seating spinal fixation rods into anchors during spinal surgery.
Innovation Solution
The development of a series of rod reduction instruments, each with a unique coupling and translation unit design, that allow for efficient alignment and seating of spinal fixation rods into anchors by applying downward force and utilizing locking mechanisms to secure the rod in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing rod reduction instruments are used, then rod alignment can be achieved, but the instruments are bulky and time-consuming
Solution Approach 1:
The rod reduction instrument is divided into separate functional modules: a coupling unit that attaches to the anchor and a translation unit that applies reduction force. This segmentation allows each component to be optimized independently, reducing overall instrument bulk while maintaining functionality.
Solution Approach 2:
The coupling unit is designed with a universal interface that can attach to various anchor types and configurations. This multi-functionality eliminates the need for multiple specialized instruments, reducing instrument bulk and simplifying the surgical toolkit.
2Manufacturing precision
If existing rod reduction instruments are used, then some reduction can be achieved, but the achievable reduction depth is limited
Solution Approach 1:
The translation unit incorporates a dynamic ratchet mechanism that allows bidirectional movement during the reduction process. This enables the surgeon to apply force in both directions, achieving greater reduction depth while maintaining a relatively simple device structure.
Solution Approach 2:
A ratchet mechanism serves as an intermediary between the surgeon's manual force and the rod reduction process. This mechanical mediator amplifies and controls the applied force, enabling deeper reduction without requiring complex powered systems.
3Productivity
If manual rod alignment is attempted without specialized instruments, then instrument complexity is reduced, but alignment precision and efficiency deteriorate
Solution Approach 1:
The ratchet mechanism provides self-locking functionality, automatically maintaining reduction force without requiring continuous manual intervention. This self-service feature increases productivity while keeping the device structure relatively simple.
Solution Approach 2:
The instrument replaces complex powered mechanical systems with a simple manual ratchet mechanism. This substitution achieves efficient rod reduction through mechanical advantage rather than through complex actuation systems.
Data Source
AI summary
This disclosure describes example embodiments of rod reduction instrumentation and other rod and vertebrae manipulation instruments. The rod reducers can be used during the installation of a rod based surgical fixation system to help urge the rod into the fixation anchors. The reducers described provide various configurations delivering large reduction distance capabilities, strong controlled reduction coupled with an ability to quickly advance the reducer if desired, and reduction of bulk through the surgical corridor.