Bone Cutting Tool Frustoconical Cavity Alignment
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Solution Overview
Problem
Conventional cutting tools struggle to accurately create frustoconical cavities in bones during hip replacement surgeries, often resulting in undersized or oversized cavities, misalignment, and bone damage due to difficulty in achieving the correct dimensions and alignment.
Innovation Solution
A cutting tool with primary and secondary cutting surfaces designed to create conical or frustoconical cavities, equipped with a cannulation for guide rod alignment and an attachment mechanism for an alignment device that ensures precise alignment and prevents over-shooting, allowing for accurate cavity creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting tools are used to create frustoconical cavities in bone, then the cavity may be undersized or oversized, but the manufacturing precision and reliability are poor
Solution Approach 1:
The cutting tool is pre-aligned with the bone using a guide rod and alignment device before cutting begins. The guide rod is inserted into the bone first to establish the correct axis, then the cutting tool is attached and aligned to this guide rod, ensuring the cavity is created at the correct position and orientation from the start.
Solution Approach 2:
A guide rod acts as an intermediary between the bone and the cutting tool. The guide rod is inserted into the bone to establish the correct cutting axis, and the cutting tool is then attached to and aligned with the guide rod, mediating the transfer of alignment information from the bone to the cutting tool.
2Productivity
If conventional cutting tools are used, then multiple attempts may be needed to create the cavity, but this increases the time required and risk of bone damage
Solution Approach 1:
The alignment device and guide rod are set up before cutting begins, establishing the correct cutting parameters in advance. This preliminary alignment ensures that the cavity is created correctly on the first attempt, eliminating the need for multiple attempts that would increase surgery time and bone damage risk.
Solution Approach 2:
The alignment device provides visual and physical feedback to ensure the cutting tool is correctly positioned and aligned with the bone before cutting begins. The guide rod fits into the bone with specific orientation, providing immediate feedback on alignment correctness, allowing the surgeon to verify proper positioning before activation.
3Measurement precision
If conventional cutting tools are used, then alignment with the optimal cutting axis is difficult, but the device complexity remains low
Solution Approach 1:
The guide rod serves as an intermediary alignment element that simplifies the alignment process. Instead of directly aligning the complex cutting tool with the bone, the guide rod first establishes the correct axis by fitting into the bone, and then the cutting tool aligns with the guide rod, breaking down the complex alignment task into simpler steps.
Solution Approach 2:
The alignment function is segmented into separate components: the guide rod that establishes the cutting axis by fitting into the bone, and the alignment device that attaches to the cutting tool and aligns it with the guide rod. This segmentation allows each component to perform its specific alignment function independently, simplifying the overall alignment process.
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 cutting tool enables precise creation of conical or frustoconical cavities, improving the fit of femoral implants and reducing bone damage by ensuring accurate alignment and controlled cutting depth.
Implementation Method 1
at least one primary cutting surface disposed at the distal end; wherein the primary cutting surface is shaped so that when, in use, a torque is applied to the proximal end of the body, the primary cutting surface cuts a conical or frustoconical shaped cavity in the bone
Data Source
AI summary
A cutting tool (1) for cutting bone, comprising: a body (2) having a proximal end (4) and a distal end (6); and at least one primary cutting surface (8) disposed at the distal end (6); wherein the at least one primary cutting surface (8) is shaped so that when, in use, a torque is applied to the proximal end (4) of the body (2), the at least one primary cutting surface (8) cuts a conical or frustoconical shaped cavity in the bone. A method for cutting bone using such a cutting tool (1).