Pre-adjusting Bone Cutting Block for Decoupled Incision Plane Navigation
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Solution Overview
Problem
Conventional cutting blocks used in computer-assisted knee arthroplasty require numerous iterations to precisely set the incision plane with respect to reference objects due to the interdependence of mechanical degrees of freedom, making navigation time-consuming and inefficient.
Innovation Solution
A cutting block with a pre-adjusting device that aligns the base coordinate system with the reference coordinate system using joints and setting elements, allowing for decoupled adjustments of the incision plane's degrees of freedom, enabling precise positioning with fewer steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cutting blocks are used with setting elements to adjust the incision plane, then the incision plane can be positioned with respect to a predetermined navigation plan, but a large number of iterations are required to precisely set the incision plane with respect to reference objects
Solution Approach 1:
The cutting block is pre-adjusted in the factory to have a base coordinate system that is pre-aligned with the reference coordinate system. This preliminary alignment eliminates the need for time-consuming iterative adjustments during surgery, as the setting elements directly control decoupled degrees of freedom relative to reference objects such as the femoral axis or tibial plateau.
Solution Approach 2:
The patent changes the parameter of coordinate system alignment by pre-configuring the base coordinate system to match the reference coordinate system. This parameter change transforms the adjustment process from coupled, interdependent movements to decoupled, independent adjustments of each degree of freedom, significantly reducing the number of iterations needed to achieve precise positioning.
2Adaptability or versatility
If setting elements are used to adjust the incision plane, then the cutting guide can be rotated about non-parallel axes and adjusted in height, but changes to one setting element affect multiple degrees of freedom of the incision plane
Solution Approach 1:
The adjusting device is segmented into multiple setting elements, each independently controlling a specific degree of freedom of the cutting guide. This segmentation decouples the adjustments, allowing each setting element to control only one mechanical degree of freedom (rotation about a specific axis or height adjustment), preventing unwanted changes in other degrees of freedom.
Solution Approach 2:
The patent changes the parameter of coordinate system alignment by pre-configuring the base coordinate system to match the reference coordinate system. This parameter change transforms the adjustment process from coupled, interdependent movements to decoupled, independent adjustments of each degree of freedom, significantly reducing the number of iterations needed to achieve precise positioning.
Data Source
AI summary
The invention relates to a device, system, and method for making an incision into a patient's bone using a cutting block, wherein locations of reference objects of the patient's body are defined with respect to a reference coordinate system. The device may include: a cutting guide having an incision plane; a localization reference for determining a spatial position of the incision plan (the localization reference secured to the cutting guide); a fixation device secured to the bone; an adjusting device for setting a position of the incision plane relative to the bone, wherein a location of the adjusting device is defined with respect to a base coordinate system; and a pre-adjusting device for aligning the base coordinate system with respect to the reference coordinate system.