Annular Cutting Tool Flared Tips and Recessed Surface for Bone Graft Resection
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Solution Overview
Problem
Existing annular cutting tools for resecting bone grafts suffer from lack of durability, inefficient cutting performance, and excessive heat generation, which can lead to premature tool dulling, binding, and reduced viability of the bone graft.
Innovation Solution
The annular cutting tool features improved cutting geometry with flared distal tips and extended gullets for debris removal, a recessed surface area to reduce heat generation and debris accumulation, and a cannulated drill bit for precise alignment and hole drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional annular cutting tools are used to resect bone grafts, then the cutting function is provided, but the tools suffer from premature dulling and lack of durability
Solution Approach 1:
The cutting tool is divided into multiple discrete cutting teeth arranged around the annular body, each tooth being replaceable or independently functional. This segmentation allows individual teeth to be replaced if dulling occurs, extending overall tool life without replacing the entire tool assembly.
Solution Approach 2:
The cutting teeth are designed with specific geometric parameters including rake angles, clearance angles, and tooth spacing that optimize cutting efficiency and reduce dulling. The annular body parameters such as wall thickness and diameter are optimized to maintain structural integrity during prolonged use.
2Productivity
If conventional annular cutting tools are used for bone graft resection, then cutting function is provided, but cutting performance is inefficient
Solution Approach 1:
The bone graft is pre-marked with alignment guides and the annular cutting tool is pre-positioned using a guide pin before activation. This preliminary alignment ensures accurate positioning and eliminates setup time during the cutting operation, improving overall cutting efficiency.
Solution Approach 2:
The annular cutting tool rotates continuously during the resection process, maintaining constant cutting action without interruption. The multiple cutting teeth are distributed around the annular body, ensuring that at least one tooth is always in contact with the bone graft, providing continuous cutting performance.
3Reliability
If conventional annular cutting tools are used, then bone graft resection is performed, but excessive heat is generated reducing bone graft viability
Solution Approach 1:
The cutting operation is performed in periodic intervals with brief pauses between cutting passes. During these pauses, the tool is withdrawn to allow heat dissipation and prevent excessive temperature buildup that could damage the bone graft tissue.
Solution Approach 2:
Irrigation fluid is introduced as an intermediary between the cutting teeth and bone graft surface. This fluid serves as a heat sink, absorbing excessive heat generated during cutting and flushing it away, thereby protecting the bone graft from thermal damage.
4Ease of operation
If conventional annular cutting tools are used, then cutting function is provided, but bone debris accumulates causing tool binding
Solution Approach 1:
Bone debris is actively extracted from the cutting zone through irrigation fluid flow and gullet design. The gullets between cutting teeth are shaped to channel debris away from the cutting interface, preventing accumulation and binding while maintaining smooth cutting operation.
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 improved design enhances durability, cutting performance, and reduces heat generation, allowing for more efficient and effective resection of bone grafts with improved tool longevity and bone graft viability.
Implementation Method 1
a cannulated drill bit that extends distally from the proximal end of the annular cutting body along the central longitudinal axis
Implementation Method 2
excessive heat generation, which can lead to premature tool dulling, binding, and reduced viability of the bone graft
Data Source
AI summary
An annular cutting tool and related methods are provided for herein that exhibit improved durability, cutting performance, and/or reduced heat generation for bone graft resections. The annular cutting tool can include an annular body having cutting teeth with a flat, flared distal tip for greater durability. An extended gullet can be disposed between groups of adjacent cutting teeth to improve removal of bone debris away from the cutting teeth more and thus prevent binding during use. The annular cutting body can have a recessed surface portion to reduce the area of direct contact to bone and thus reduce heat generated. The recessed surface portion can also provide an area in which bone debris can accumulate away from the cutting teeth to prevent or reduce binding of the tool during use. The annular cutting body can also include a drill bit for drilling a hole in a resected bone graft.