Patient-Specific Ankle Cutting Guides for Precise Bone Resection
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Solution Overview
Problem
The accuracy of bone resections during total ankle arthroplasty procedures is compromised due to the small operative area and limited visualization, making it difficult for surgeons to place implant components correctly.
Innovation Solution
Patient-specific cutting guides are designed to fit onto the tibia and talus in a single orientation, using imaging and specialized software to create matching surfaces that guide cutting instruments along precise planes, ensuring accurate bone resections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional cutting guides are used in TAA procedures, then the device complexity is low, but the manufacturing precision of bone resections deteriorates due to limited visualization and small operative area
Solution Approach 1:
Patient-specific cutting guides are designed and manufactured before surgery based on pre-operative imaging (CT or MRI scans). The guides incorporate patient-specific anatomical surface mappings that are created in advance, allowing the surgical team to plan the exact resection planes and implant positioning before the patient enters the operating room. This preliminary customization enables high precision bone resections despite the complexity of the customized guide systems.
Solution Approach 2:
The cutting guides create accurate physical copies or representations of the patient's unique ankle anatomy through imaging and 3D modeling. The guides incorporate negative impressions or matched surfaces of the patient's distal tibia and proximal talus, allowing the surgical instrument to be positioned precisely relative to the actual bone geometry. This copying approach transforms complex anatomical variations into standardized guide interfaces that ensure repeatable, accurate cuts.
2Ease of operation
If the operative area is small with limited space for visualization, then the surgical procedure is minimally invasive, but the ease of operation deteriorates due to difficulty in visualizing and accessing the operative site
Solution Approach 1:
Patient-specific cutting guides serve as intermediary devices between the surgeon and the difficult-to-access ankle joint. The guides extend into the small operative area and provide external reference surfaces and instrument channels that guide cutting tools precisely to the target location. This intermediary approach allows the surgeon to work from a more accessible position while the guide mediates the interaction between the large surgical instrument and the small confined operative space.
Solution Approach 2:
The cutting guides utilize the external surface area of the ankle bones to establish precise positioning, effectively moving the control interface from the confined internal operative space to the external anatomical surface. By mapping and utilizing the three-dimensional surface geometry of the distal tibia and proximal talus, the guides create a larger effective working area on the bone surface that translates into precise control within the small internal operative space.
Data Source
AI summary
The disclosure includes devices for assisting in performing an ankle arthroplasty on a non-resected bone surface of a tibia and/or a talus. The devices may include patient-specific mating surfaces configured to engage the non-resected bone surface in a single relative position relative to the non-resected bone surface. The patient specific nature of the mating surface portion may be generated in the devices prior to the devices being brought into contact with the bone. The devices may include various cutting guides and holes for receiving fasteners to fasten the devices to the bone. The devices may include various features to enhance the stability and/or surface area contact between the devices and the bones.