Ankle Prosthesis Phantom Skid Dynamic Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for implanting ankle prostheses often result in unsatisfactory positioning, leading to excess stress and premature wear due to inadequate relative positioning between the tibial implant and the prosthetic skid, whether stationary or moving, lacking a reliable correction option for surgeons.
Innovation Solution
A surgical instrumentation kit comprising tibial and talus phantoms, along with a phantom skid, that allows dynamic engagement through ankle joint movement to self-position the tibial phantom optimally on the tibia, ensuring precise anatomical alignment and reducing medio-lateral movement, thereby facilitating accurate implant placement and minimizing stress on the tibial implant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional phantom components are used for preoperative testing, then the surgeon can verify bone preparation quality, but the relative positioning between tibial implant and prosthetic skid cannot be reliably corrected
Solution Approach 1:
The phantom skid is designed to be movable relative to both the tibial phantom and talus phantom, allowing dynamic adjustment during preoperative testing. This mobility enables the surgeon to test and correct the relative positioning between tibial and talus components, ensuring optimal alignment before final implantation, thereby resolving the positioning accuracy issue while maintaining operational ease
Solution Approach 2:
The phantom assembly allows the surgeon to self-correct positioning errors by manually adjusting the phantom skid's position relative to the tibial and talus phantoms during testing. This self-adjustment capability eliminates the need for additional correction instruments or procedures, improving both reliability and ease of operation
2Stability of the object's composition
If stationary skid prosthesis is implanted, then structural stability is achieved, but excess stress leads to connection zone breaking or tibial bone damage
Solution Approach 1:
The preoperative testing with phantom components allows the surgeon to identify and correct potential stress concentration issues before final implantation. By verifying the positioning and alignment of the stationary skid prosthesis during the testing phase, the surgeon can prevent excess stress scenarios that would lead to connection zone breaking or bone damage, thereby maintaining structural stability while improving stress resistance
3Strength
If moving skid prosthesis is implanted, then stress distribution is improved, but the prosthetic skid surface extends outside tibial implant outline causing premature wear
Solution Approach 1:
During preoperative testing with the movable phantom skid, the surgeon can verify that the skid surfaces remain properly contained within the tibial implant outline through dynamic movement testing. This preliminary verification ensures optimal positioning that distributes stress evenly while preventing the skid from extending beyond the implant boundaries, thereby improving stress distribution without compromising service life
Solution Approach 2:
The movable phantom skid provides real-time feedback during dynamic testing, allowing the surgeon to observe the relative movement between tibial and talus components. This feedback mechanism enables the surgeon to adjust positioning to ensure the skid surfaces remain properly aligned and contained, preventing premature wear while maintaining improved stress distribution characteristics
Data Source
AI summary
A surgical instrument including at least one tibial phantom generally corresponding to at least certain features of the tibial implant. The tibial phantom includes a top surface adapted to move freely against the prepared bottom end of the tibia. At least one talus phantom generally corresponding to at least certain features of the talus implant is engaged with the prepared top surface of the talus. At least one phantom skid is located between the tibial phantom and the talus phantom. The phantom skid is engaged with the tibial phantom such that dynamic engagement between the phantom skid and the talus phantom through at least extension and flexion of the ankle joint positions the tibial phantom on the prepared bottom end of the tibia. The phantom skid can either be a part of the tibial phantom or a separate component.