Interspinous Cutting Tool Guide for Precise Bone Shaping
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Solution Overview
Problem
Conventional methods for implanting interspinous devices lack precise control over device positioning and shaping of the spinous processes, leading to potential improper placement and suboptimal results.
Innovation Solution
A system comprising a cutting tool guide and holder that allows for accurate and controlled shaping of the spinous processes, using guiding surfaces and adjustable attachments to ensure precise placement of the implantable device within the interspinous space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional freestyle methods using chisels or power cutting tools are used to shape spinous processes, then bone tissue can be removed to increase surface contact, but precise control over device positioning and shaping is lost
Solution Approach 1:
A guide tool is introduced as an intermediary device between the surgeon and the cutting tool. The guide tool includes a guide body with a guide bore that directs the cutting tool along a predetermined path, ensuring precise shaping of the spinous process while maintaining system simplicity through the use of a straightforward mechanical guide structure
Solution Approach 2:
The guide tool is pre-positioned on the spinous process before cutting begins. The guide body is attached to the spinous process with pins or screws, establishing a fixed reference frame that determines the exact positioning and orientation of the cut before the cutting tool is inserted and activated
2Reliability
If more bone tissue is removed to increase surface contact between device and spinous processes, then device stability improves, but surgical time and bone loss increase
Solution Approach 1:
Instead of removing large amounts of bone tissue, the guide tool enables precise localized shaping of the spinous process surface. The guide bore restricts the cutting tool to remove only the specific amount of bone needed to create an optimal bearing surface, minimizing unnecessary bone loss and reducing surgical time while maintaining device stability
Solution Approach 2:
The guide tool allows the surgeon to perform partial cutting actions by adjusting the depth of insertion of the cutting tool into the guide bore. This enables removal of only the necessary portion of bone tissue to achieve adequate surface contact, avoiding excessive bone removal and reducing overall surgical time
3Manufacturing precision
If the device is implanted without precise shaping guidance, then the surgical procedure is simpler and faster, but improper placement may lead to device failure
Solution Approach 1:
The guide tool serves as a mechanical intermediary that translates the surgeon's positioning actions into precise cutting paths. The guide body with its guide bore automatically ensures accurate shaping without requiring the surgeon to have advanced skill in freehand bone contouring, thus maintaining ease of operation while achieving high precision
Solution Approach 2:
The guide tool is designed to be self-aligning and self-guiding. Once attached to the spinous process, the guide body automatically orients itself correctly, and the guide bore automatically directs the cutting tool along the proper path, reducing the skill requirement for the surgeon and simplifying the operation while ensuring precise shaping
Data Source
AI summary
A method and system are provided for preparing an interspinous space to receive an implantable device. The system may comprise a cutting tool guide having a guiding surface for directing a cutting tool therethrough and a holder for positioning the cutting tool guide relative to the interspinous space. The holder may be configured to adjustably attach to at least one of a pair of spinous processes defining the interspinous space.