Surgical Instrument for Rod Reduction Using Pivotally Interconnected Gripping Noses
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Solution Overview
Problem
Current surgical instruments for reducing rod components into bone anchors in orthopedic constructs for spinal deformity treatment lack effective mechanisms for precise and efficient rod reduction, necessitating improved tools and methods for this procedure.
Innovation Solution
A surgical instrument featuring pivotally interconnected members with a gripping nose to engage bone anchors, a channel to hold and guide rods, and a rotatable member with a threaded guide to advance or retract the rod into the anchor, enhancing the capability for precise rod reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional surgical instruments are used for rod reduction, then the procedure can be performed, but the precision and efficiency of rod reduction is insufficient
Solution Approach 1:
The instrument is divided into distinct functional components: a gripping nose for engaging the bone anchor, a rod engagement channel for positioning the rod, and a rotatable member with threaded guide for controlled advancement. This segmentation allows each component to perform its specific function with high precision while working together efficiently
Solution Approach 2:
The rod engagement channel acts as an intermediary structure that guides and positions the rod during reduction. The threaded guide serves as a mediator between the rotatable member and the rod, translating rotational motion into precise linear advancement of the rod into the bone anchor
2Ease of operation
If force is applied to reduce the distance between the rod and the next anchor, then rod reduction is achieved, but the process lacks control and precision
Solution Approach 1:
The instrument incorporates dynamic elements including pivotally interconnected members that allow controlled movement, and a rotatable member that converts rotational motion into controlled linear advancement. This dynamic design enables the operator to apply force in a controlled manner while maintaining precision through the threaded guide mechanism
Solution Approach 2:
The threaded guide mechanism changes the parameter of motion from rotational to linear, providing mechanical advantage and precise control over the advancement distance. By controlling the number of rotations of the rotatable member, the operator can precisely control the linear displacement of the rod into the bone anchor
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
The instrument enables precise and efficient reduction of rods into bone anchors, facilitating better spinal curvature alignment and construct stability, addressing the limitations of existing technologies by providing a more effective rod reduction mechanism.
Implementation Method 1
a threaded guide and a rotatable member including a threaded portion disposed between its proximal and distal end. This threaded portion engages the threaded guide. With the rotatable member threaded to the guide, the rotatable member can be turned to advance or retract its distal end relative to the seat in the bone anchor
Implementation Method 2
Proximal to the gripping nose is a channel structured to hold a rod while the gripping nose is engaged with the bone anchor. The channel is further structured to urge the rod into a seat in the bone anchor when the gripping nose is rocked about the bone anchor
Data Source
AI summary
One embodiment of the present application includes a surgical instrument comprising a first member and a second member that are pivotally interconnected together. The first member and the second member each include a proximal end structured for manual manipulation by an operator and a distal end defining a gripping nose structured to engage a bone anchor. The instrument further includes a bearing surface to contact an implantable rod when the gripping nose is engaged with a bone anchor and to urge the rod toward the bone anchor when the gripping nose is pivoted thereabout. A thread guide is included that is engaged by threading of a rotatable member. The rotatable member can include a swivel-mounted head structured to bear against and further urge the rod toward a seat in the bone anchor when the rotatable member is turned through the guide.