Spinal Centering Tool with Pin Guides
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Solution Overview
Problem
Current methods for stereotactically locating and preparing the site for intervertebral endoprosthesis implants are complex, expensive, and not always available, particularly in smaller healthcare systems, and lack precision due to the proximity of critical structures like the spinal cord and vertebral arteries.
Innovation Solution
A centering tool with a support portion, handles, and pin placement guides allows for precise transverse centering between vertebrae, using a spring mechanism for alignment and a bubble level for orientation, enabling single-step centering and pin placement for accurate implant positioning without requiring expensive electronic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic systems with computing power are used for stereotactic positioning, then positioning precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex electronic and computerized tracking systems with a purely mechanical centering tool that uses physical guides, pins, and geometric relationships to achieve stereotactic positioning. The mechanical system uses interconnected components with fixed geometric relationships to locate the implantation site without requiring electronics, software, or external frames.
Solution Approach 2:
The patent creates a simplified mechanical model or copy of the stereotactic positioning function, replicating the essential geometric relationships and reference point establishment without copying the complex electronic systems. The centering tool establishes reference points and midlines through mechanical means that mirror the function of electronic systems but with simpler physics.
2Measurement precision
If electronic systems with specialized software are used for stereotactic positioning, then positioning precision is improved, but ease of operation deteriorates due to complexity
Solution Approach 1:
The patent replaces electronic systems requiring specialized software with a mechanical system that operates through direct physical manipulation. The surgeon simply positions the centering tool on anatomical landmarks, and the mechanical guides automatically establish reference points and midlines without requiring software operation or computational processing.
Solution Approach 2:
The centering tool is self-contained and self-explanatory, with its geometric relationships and reference point establishment functioning automatically once positioned on anatomical landmarks. The tool does not require external computing resources, software interfaces, or complex operational procedures - it performs stereotactic positioning through its inherent mechanical design.
3Measurement precision
If expensive electronic systems are used for stereotactic positioning, then positioning precision is improved, but availability deteriorates in smaller healthcare systems
Solution Approach 1:
The patent employs a simple, inexpensive mechanical centering tool that can be manufactured at low cost using conventional machining techniques. The tool appears to be a one-time or limited-use device that provides precise stereotactic positioning without the high capital investment required for electronic systems, making it accessible to smaller healthcare systems and those in less developed countries.
Solution Approach 2:
By replacing expensive electronic systems with a simple mechanical device, the patent makes stereotactic positioning technology universally accessible. The mechanical centering tool requires no specialized infrastructure, computing power, or technical expertise beyond basic surgical skills, thereby dramatically improving availability across all healthcare settings.
4Device complexity
If conventional imaging technologies are used without electronic tracking, then cost is reduced, but positioning precision may deteriorate
Solution Approach 1:
The centering tool acts as a mechanical intermediary between conventional imaging technologies and the implantation site. It translates two-dimensional imaging information into precise three-dimensional positioning by establishing reference points and midlines through mechanical guides and pins, bridging the gap between simple imaging and precise positioning without requiring electronic tracking.
Solution Approach 2:
The centering tool performs preliminary stereotactic positioning and reference point establishment before implantation. By pre-establishing the midline and reference points mechanically, the tool ensures precise positioning is achieved before the actual implantation occurs, maintaining high precision throughout the procedure using only conventional imaging for guidance.
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 tool enables precise localization and positioning of implants, ensuring proper load distribution and reducing the risk of uneven balancing and complications from errors in positioning.
Implementation Method 1
the handles contain a spring in between them to bias them toward each other in a closed position so that the distal portions of both handles abut each other in a resting or closed position
Implementation Method 2
using a spring mechanism for alignment and a bubble level for orientation
Data Source
AI summary
A centering tool for transverse centering between an upper vertebra and a lower vertebra is disclosed. The centering tool comprises a support portion having a proximal end and a distal end, two handles, and two pin placement guides, each guide having a hollow cylinder shape for the placement of a drill or pin on each of the upper and lower vertebrae. The two handles each have a proximal end and a distal end, wherein the proximal end of each handle is connected to the proximal end of the support portion, and the distal end of each handle ultimately contact the uncular joint of one of the vertebrae when centering is achieved. Preferably, each handle has a spring that biases the handle in a closed position so that the distal portions of both handles abut each other in a resting or closed position.


