Pedicle Subtraction Osteotomy Guide With Intersecting Axes
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Solution Overview
Problem
Current pedicle subtraction osteotomy procedures lack precision due to the lack of guiding instruments, leading to potential improper trajectory of cutting instruments and increased risk of injury during spinal realignment surgeries.
Innovation Solution
A surgical cutting guide assembly with strategically oriented slots and channels to guide cutting instruments, ensuring precise alignment and intersection for accurate subtraction angles, and a method involving a post with locking elements for secure positioning during the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If freehand cutting instruments are used without guiding instruments, then the surgical procedure is simpler and faster to perform, but cutting precision and trajectory control deteriorate
Solution Approach 1:
A cutting guide assembly is introduced as an intermediary device between the surgeon and the cutting instruments. The guide assembly includes slots and channels that mediate the interaction by providing a predetermined trajectory path, ensuring precise cutting while maintaining ease of operation through simple instrument insertion and advancement.
2Manufacturing precision
If guiding instruments are introduced to improve cutting precision, then trajectory control improves, but device complexity increases
Solution Approach 1:
The cutting guide assembly is segmented into multiple independent components including slots for trajectory guidance, channels for instrument advancement, and interfaces for securing to the vertebral body. This segmentation allows each component to perform its specific function independently, reducing overall complexity while maintaining cutting precision.
3Measurement precision
If impaction equipment is used to advance cutting instruments, then cutting depth control improves, but risk of improper trajectory and injury increases
Solution Approach 1:
The cutting guide assembly is secured to the vertebral body before any cutting instruments are advanced. This preliminary action establishes the correct trajectory and depth limits in advance, preventing improper instrument placement and reducing the risk of injury during the cutting process.
Solution Approach 2:
The guide channels act as an intermediary structure that physically constrains the cutting instruments to follow a predetermined safe trajectory. This mediation eliminates the need for forceful impaction equipment while maintaining precise depth control, thereby reducing the risk of injury.
Data Source
AI summary
A virtual surgical cutting guide may have first and second slots defining first and second axes respectively. The virtual surgical cutting guide may be positioned away from a vertebral body such that the first and second axes intersect at a distal point located in an interior of the vertebral body. The virtual surgical cutting guide may include the virtual surgical cutting guide with first and second cutting instruments. A method of performing a pedicle subtraction osteotomy may include the steps of placing the virtual surgical cutting guide over the first and second cutting instruments.