Patient-Specific Template for Precise Partial Knee Replacement Cuts
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Solution Overview
Problem
Current uni-compartmental knee replacement surgeries face challenges with inaccurate implant positioning, complex and time-consuming surgical instruments, long learning curves, and logistical difficulties in instrument transportation, particularly in developing countries, leading to lower success rates and increased waiting lists.
Innovation Solution
A patient-specific surgical template for uni-compartmental knee replacement comprising a femoral and tibial component with cutting slots, fixation holes, and locating arms, designed for precise bone resection and alignment, allowing inexperienced surgeons to perform surgeries efficiently and accurately, and accommodating intraoperative adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional surgical instruments are used for UKA, then the surgery can be performed with standard equipment, but the instruments are complex, large in number, and require considerable time for sterilization and handling
Solution Approach 1:
The patent combines multiple conventional surgical instruments into a single patient-specific template that integrates cutting guides, alignment references, and positioning features. This consolidation reduces the number of separate instruments needed while maintaining all necessary surgical functions.
Solution Approach 2:
The patient-specific template is designed as a segmented device with modular components that can be separately manufactured and then assembled. This allows each segment to perform a specific function while the overall device remains manageable and less complex than using multiple separate conventional instruments.
2Measurement precision
If conventional X-ray based surgical planning is used, then the planning process is simple, but the positioning accuracy of the implant is reduced
Solution Approach 1:
The patent implements preoperative CT-based planning that creates a 3D model of the patient's knee joint before surgery. This preliminary action allows precise measurement and planning of implant positioning, cutting angles, and template design, which are then transferred to the physical patient-specific template used during surgery.
3Productivity
If a large number of surgical kits are purchased to overcome transportation limitations, then instrument availability is improved, but the cost and waiting lists increase
Solution Approach 1:
The patient-specific template is designed as a universal device that can be used for any UKA procedure once manufactured for a specific patient. The template performs multiple functions including cutting guidance, alignment reference, and positioning aid, eliminating the need for multiple specialized instrument sets.
Data Source
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AI summary
This invention relates to a method and surgical device for preparing the knee joint of a patient undergoing to partial knee replacement. The device is a patient specific and has information about implant size, alignment and bone cut. The conventional instrumentations is very complex and has a very long learning curve, The device is used to assist the surgeons, especially the low-experience one to perform the surgery of partial knee replacement in a few steps regardless to the cleverness of the surgeon. This device consists of two parts, one is related to femoral template and the other one is related to tibial template. The femoral template is positioned to a predefined location on the femur bone based on a virtual planning of the surgery on specific software. The femoral template allows to perform the posterior distal cut and detection of the location two holes relevant to implant pegs, while the tibial template allows the surgeon to make the tibial cut and vertical cut, beside that it has a creative and unique design for the cutting plane with double slots which allows the surgeon to make extra bone removing if needed or while he decided to use larger size of polyethylene insert.