Bone Preparation System with Pivoting Cutting Instrument
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Solution Overview
Problem
Current bone reaming systems are inadequate for preparing complex and non-uniform geometries in the metaphyseal region of long bones during revision total knee replacement (TKR) procedures, often leading to excessive bone removal and potential fractures due to the use of impaction techniques in compromised bone regions.
Innovation Solution
A bone preparation system comprising a cutting instrument and a guiding element that allows for precise rotation and pivoting about a guiding element, with the guiding surface derived from patient-specific imaging to create unique defect geometries without impaction, using a cutting instrument that can rotate and pivot about the guiding element, ensuring accurate and customized bone preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard augment prostheses are used with limited sizes and shapes, then the procedure is simpler, but excessive bone removal is required to accommodate the standard geometries
Solution Approach 1:
The guiding element is customized to match the specific defect geometry of each patient's bone, allowing the preparation to adapt to local anatomical variations rather than forcing the bone to conform to standard implant geometries. This patient-specific approach preserves healthy bone while preparing only the necessary defect region.
Solution Approach 2:
The guiding element replicates the outer profile of the augment implant, creating a negative impression that guides the cutting instrument to prepare the exact complementary geometry needed. This copying approach ensures precise fit without requiring excessive bone removal.
2Ease of manufacture
If impaction based preparation technique such as broaching is used, then bone defect region can be prepared, but bone fractures may occur in compromised bone regions
Solution Approach 1:
The patent replaces the impaction-based mechanical system (broaching) with a cutting-based system guided by a customized guiding element. The cutting instrument removes bone material through controlled cutting rather than impact forces, eliminating the risk of fractures in compromised bone regions while effectively preparing the defect geometry.
3Device complexity
If current preparation instrument systems are used, then the system is simpler, but complex and non-uniform geometries cannot be prepared
Solution Approach 1:
The system is segmented into modular components: a standardized cutting instrument and a customized guiding element. This segmentation allows the simple, well-understood cutting instrument to be combined with a patient-specific guiding element that provides the necessary geometric complexity, achieving both simplicity and adaptability.
Solution Approach 2:
The guiding element serves as an intermediary between the simple cutting instrument and the complex defect geometry. It translates the simple rotational motion of the cutting instrument into the complex preparatory geometry needed for patient-specific augments, enabling standard instruments to create non-uniform geometries.
4Manufacturing precision
If patient-specific imaging and customized guiding elements are used, then unique defect geometries can be created, but the procedure becomes more complex
Solution Approach 1:
Patient-specific imaging and guiding element design are performed in advance, before the actual bone preparation surgery. This preliminary customization allows the surgical procedure itself to remain relatively simple, as the complex geometric planning is completed beforehand, reducing intraoperative complexity while maintaining high precision.
Data Source
AI summary
The invention includes a system, method and kit for preparation of a bone. One aspect of the present invention is a bone preparation system comprising a cutting instrument and a guiding element. The cutting instrument includes a distal attachment feature and a distal region. The guiding element includes a proximal attachment feature and a guiding surface. When the proximal attachment feature of the guiding element is engaged with the distal attachment feature of the cutting instrument, the cutting instrument can pivot about the proximal attachment feature until the distal region contacts the guiding surface.