Modular Surgical Guide Assembly for Ankle Alignment Precision
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Solution Overview
Problem
Total ankle replacement surgery faces challenges in accurately aligning the ankle joint due to the complexity of manually aligning the tibial and talar bones, leading to higher failure rates compared to other joint replacements, necessitating improved tools and methods for precise bone resection cuts.
Innovation Solution
A surgical guide assembly comprising modular instruments with customized bone contact interfaces and connection mechanisms that allow for precise alignment and positioning relative to the patient's anatomy, enabling accurate alignment of the ankle joint by forming assemblies that guide other surgical instruments for optimal implant placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment methods are used for ankle joint alignment, then the surgeon has flexibility in operation, but the alignment precision and reliability are insufficient leading to high failure rates
Solution Approach 1:
The alignment system is divided into multiple modular components including patient-specific guides, universal guides, and interchangeable alignment tools that can be combined in different configurations. Each module performs a specific function (e.g., tibial alignment, talar alignment, soft tissue balancing) allowing surgeons to select only the necessary components for each procedure, thereby improving precision without requiring all components to be present simultaneously.
Solution Approach 2:
Patient-specific cutting guides and alignment jigs serve as intermediary devices between the surgeon's manual alignment attempts and the final bone resection. These guides translate preoperative planning data into precise physical alignment references during surgery, acting as mediators that ensure accurate osteotomy cuts and implant positioning while reducing reliance on purely manual alignment techniques.
2Reliability
If complex alignment instruments are used to improve alignment accuracy, then the alignment reliability improves, but the ease of operation and surgical time are reduced
Solution Approach 1:
Patient-specific alignment guides are manufactured preoperatively based on CT or MRI imaging and surgical planning. These custom guides arrive ready-to-use in the operating room, eliminating the need for complex intraoperative alignment procedures. The preoperative preparation of patient-specific instruments ensures reliable alignment while simplifying the actual surgical operation, as the guides are designed to be straightforward to position and use.
Solution Approach 2:
The alignment system incorporates adjustable and repositionable components that can be dynamically modified during surgery. Universal guides and alignment tools allow for intraoperative adjustments to accommodate varying anatomical conditions and surgical findings, maintaining ease of operation while ensuring reliable alignment through adaptability rather than rigid fixed procedures.
3Adaptability or versatility
If standardized alignment tools are used for all patients, then the device complexity is reduced, but the adaptability to individual patient anatomy is insufficient
Solution Approach 1:
The system combines patient-specific custom guides with universal alignment tools that can be used across different patient anatomies. The universal components provide a standardized platform that adapts to various foot and ankle configurations, while patient-specific elements address individual anatomical variations. This multi-functional approach allows a single instrument system to serve both customized and generalized alignment needs, improving adaptability without proportionally increasing overall system complexity.
Data Source
AI summary
A surgical guide assembly is disclosed herein that includes instruments configured to aid in the alignment of surgical instruments. In one aspect, a first and second instrument are provided that are configured to be connected to each other via interfaces and each define bone contact interface. The bone contact interfaces are configured to engage with the tibia and talus, in one embodiment.