Femoral Cutting Block Offset Guide for Knee Surgery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current orthopaedic joint replacement procedures face challenges in accurately preparing and aligning prosthetic components during revision knee surgeries, particularly in determining the correct offset orientation and securing the femoral component to the patient's femur, which can affect the stability and longevity of the implant.
Innovation Solution
The orthopaedic surgical instrument system includes a femoral cutting block with an offset guide and intramedullary orthopaedic surgical instrument, featuring a pivotally coupled adaptor body and elongated shaft, along with an offset indicator and stem stabilizer, to facilitate precise alignment and securement of the prosthetic femoral component by determining the offset orientation and adjusting the position of the cutting block relative to the patient's anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional orthopaedic surgical instruments are used for revision knee surgery, then the surgical procedure can be performed, but the accuracy of offset orientation determination and alignment of prosthetic components deteriorates
Solution Approach 1:
The offset guide assembly is divided into multiple independent components: a cutting block for positioning, an adaptor body with pivotal connection, and an elongated shaft with intramedullary instrument. This segmentation allows each component to perform its specific function independently, improving the overall measurement precision of offset orientation while maintaining system reliability through modular design.
Solution Approach 2:
The offset guide assembly acts as an intermediary tool between the surgeon and the prosthetic components. It provides a mechanical reference system that mediates the determination of offset orientation and alignment, thereby improving measurement accuracy and subsequently enhancing implant stability through precise positioning.
2Measurement precision
If complex offset guide assemblies are used to improve alignment accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The cutting block is designed with multi-functionality, serving both as a positioning reference for the offset guide assembly and as a cutting guide for preparing the femoral bone surface. The adaptor body provides both pivotal connection functionality and structural support. This multi-functionality reduces the need for separate specialized tools, thereby improving alignment accuracy without proportionally increasing device complexity.
Solution Approach 2:
The offset guide assembly merges multiple functions into a single integrated system: offset measurement, alignment reference, and cutting guidance. By combining these functions that would traditionally require separate instruments, the system achieves high alignment accuracy while controlling overall device complexity through functional integration.
3Manufacturing precision
If precise alignment tools are used to improve prosthetic component positioning, then the manufacturing precision improves, but the ease of operation deteriorates
Solution Approach 1:
The offset guide assembly is pre-configured with specific geometric relationships and reference features before surgery. The adaptor body is pre-set with pivotal connection capabilities, and the cutting block is pre-positioned with appropriate angles. This preliminary preparation ensures that during the actual surgical procedure, the surgeon can achieve precise prosthetic component positioning without complex real-time adjustments, thereby maintaining ease of operation while improving manufacturing precision.
Data Source
AI summary
An orthopaedic joint replacement system is shown and described. The system includes a number of prosthetic components configured to be implanted into a patient's knee. The system also includes a number of surgical instruments configured for use in preparing the bones of the patient's knee to receive the implants. A method or technique for using the surgical instruments to prepare the bones is also disclosed.