Cannulated Sleeve Burr Surface for Spinal Implant Insertion
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Solution Overview
Problem
Existing instrumentation for forming openings in bone for implant placement often experiences skiving due to the angled anatomy of the bone, leading to inaccurate trajectories and reduced surgical efficiency.
Innovation Solution
A surgical system comprising a cannulated sleeve with a distal burr surface and a drill bit, designed to prevent skiving by forming a pocket in the bone that aligns with the drill bit's trajectory, ensuring accurate and efficient implant placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional incision tools are used to create openings in bone, then the surgical procedure can be performed, but skiving occurs due to angled bone anatomy leading to inaccurate trajectories
Solution Approach 1:
The burr surface is used to pre-form a pocket in the bone before the drill bit creates the final opening. This preliminary action prepares the bone surface to prevent skiving during subsequent drilling, ensuring accurate trajectory for implant placement.
Solution Approach 2:
The burr surface acts as an intermediary element between the incision tool and the drill bit. It modifies the bone surface by creating a pocket that guides the drill bit, preventing direct contact and skiving between the drill bit and angled bone surface.
2Ease of operation
If the incision tool slips along the bone surface, then the tool can be inserted, but the trajectory becomes inaccurate for implant placement
Solution Approach 1:
The burr surface creates a pocket in advance that serves as a guide for tool insertion. This preliminary pocket formation ensures that subsequent tool insertion follows the desired trajectory without slipping, maintaining both ease of operation and trajectory accuracy.
3Productivity
If drilling is performed without a pre-formed pocket, then the procedure is simpler, but skiving causes reduced surgical efficiency
Solution Approach 1:
The burr surface and drill bit are combined in a single surgical instrument, allowing both pocket formation and drilling to be performed in sequence without changing tools. This integration maintains surgical efficiency by reducing instrument changes while preventing skiving through the pre-formed pocket.
Solution Approach 2:
The burr surface performs preliminary pocket formation before drilling, which prevents skiving and ensures accurate trajectory. This preliminary action, while adding a step, actually improves overall surgical efficiency by preventing rework from incorrect implant placement.
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 system effectively prevents skiving by creating a stable pocket in the bone, allowing for precise and efficient drilling of implant sites, thereby enhancing surgical accuracy and efficiency.
Implementation Method 1
rotating the cannulated sleeve about the insertion axis to cause the burr surface to contact a surface of the bone that is not perpendicular to the insertion axis to form a pocket in the bone
Data Source
Figure 1~2
Figure 3~5
Figure 6A~6B
AI summary
A surgical tool for use with a drill bit (124, 224) to prevent skiving at an implant insertion site on a bone includes a cannulated sleeve (140, 240) having a distal end (148) defining a burr surface (152, 152'). The distal end may be detachable from a body of the cannulated sleeve. The tool may be used with more than one distal end, each of the distal ends defining a burr surface having a different cutting surface from the others. The tool may form a system (100, 200) that includes the drill bit. Another surgical system (300) for use with a drill (380) to prevent skiving at an implant insertion site on a bone includes a cannulated guide tube (320), an obturator (340) to be disposed within the guide tube, and a burr tool (360) to be disposed within the obturator, the burr tool having a distal end (363) defining a burr surface (366). The drill can be disposed within the guide tube after removal of the obturator and the burr tool.