Bone Cutting Guide Assembly With Length Measurement for Joint Fit
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Solution Overview
Problem
Existing bone cutting guides in artificial joint surgery often result in inaccuracies due to reliance on operator judgment, leading to misfitting replacement joints and reduced patient satisfaction.
Innovation Solution
A bone cutting tool assembly featuring a guide unit with a guide slit and anchor, a length measuring unit with a reference module and moving guide part, and protection units to ensure precise cutting perpendicular to the bone's longitudinal direction, using a combination of mechanical components and indicators for accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If operator's eye measurement or experience is used for bone cutting, then the surgical process is simple and quick, but the cutting precision and accuracy deteriorate
Solution Approach 1:
The cutting guide is divided into multiple independent components: a guide body with guide slit, a separate measuring device with scale, and an anchor mechanism. This segmentation allows each component to perform its specific function precisely while keeping the overall system manageable and not excessively complex.
Solution Approach 2:
A measuring device acts as an intermediary between the guide structure and the cutting process. The measuring device with its scale provides an intermediate measurement step that translates the position along the guide slit into a precise numerical value, enabling accurate cutting length determination without requiring complex integrated systems.
2Measurement precision
If conventional guide devices are used that set approximate cutting position through intramedullary femoral implant, then the device structure is simple, but the positioning accuracy deteriorates
Solution Approach 1:
The invention replaces approximate mechanical positioning through intramedullary implants with a direct external measuring system. The measuring device with scale provides precise mechanical measurement of the cutting position along the guide slit, substituting the indirect and approximate positioning method with a direct measurement approach that achieves higher accuracy.
Solution Approach 2:
The guide slit serves as a physical copy or template of the desired cutting path and position. By inserting the measuring device into the guide slit, the exact position and orientation of the cut are replicated and measured, ensuring that the actual cutting matches the planned cutting parameters with high precision.
3Object-affected harmful factors
If no protection units are used during bone cutting, then the device structure is simpler, but the risk of damaging surrounding tissues increases
Solution Approach 1:
Protection units are attached to the guide body in advance, before the cutting operation begins. These protection units extend into the surrounding tissue space to cushion or block potential damage from the cutting tool, preventing harm to nerves, blood vessels, and other sensitive structures before any damage can occur.
Data Source
AI summary
Provided are a bone cutting tool assembly for artificial joint surgery. The assembly comprises a guide unit including a body having at least one guide slit and an anchor configured to extend from a side of the body, having a plurality of pin insertion holes; and a length measuring unit including a reference module having a slit insertion part inserted into the guide slit and a moving guide part extending in a direction perpendicular to a surface of the slit insertion part, and a position variable module slidingly coupled to the reference module through the moving guide part.