This project developed a prosthetic interface design and manufacturing pipeline that uses a novel computational algorithm to create subject-specific transtibial liner and socket components that can be additively manufactured at low cost. The residual limb is imaged using a magnetic resonance imaging (MRI) device, and the image set is segmented into a three-dimensional model. This approach is superior to other 3D-modeling prosthetic interface techniques as it is able to capture bone geometries and soft tissue depths of the residuum. A more accurate topology of the skin is captured using digital image correlation (DIC), and this mesh is used in replacement of the MRI skin. The socket is divided into four distinct pressure regions, and the nominal pressure applied at each region can be adjusted to be patient-specific. Finite element analysis is run to simulate liner donning and bodyweight loading upon the interface to generate the final pressure map and liner-socket geometries. Manual modifications to the mesh can be made based on subject feedback. The final model is then … View full description
This project developed a prosthetic interface design and manufacturing pipeline that uses a novel computational algorithm to create subject-specific transtibial liner and socket components that can be additively manufactured at low cost. The residual limb is imaged using a magnetic resonance imaging (MRI) device, and the image set is segmented into a three-dimensional model. This approach is superior to other 3D-modeling prosthetic interface techniques as it is able to capture bone geometries and soft tissue depths of the residuum. A more accurate topology of the skin is captured using digital image correlation (DIC), and this mesh is used in replacement of the MRI skin. The socket is divided into four distinct pressure regions, and the nominal pressure applied at each region can be adjusted to be patient-specific. Finite element analysis is run to simulate liner donning and bodyweight loading upon the interface to generate the final pressure map and liner-socket geometries. Manual modifications to the mesh can be made based on subject feedback. The final model is then sent for fabrication via 3D printing.
The findings and results of this project have many beneficial applications in the prosthetics industry. The pipeline reduces the amount of required in-person time from the patient, as design can be done remotely once the image set is obtained. This will help those who do not have the time or means to travel to a prosthetic clinic often. The design algorithm also retains a memory of subject-specific liner and socket preferences, so that future sockets built on the algorithm are more likely to be comfortable on the first try. This will reduce repetition in the interface design process, shortening the lead times for comfortable sockets and allowing more patients to be seen. 3D printing from a digital model shortens the time and reduces the cost for check sockets, and by printing multiple check socket variations a patient will have the opportunity to directly compare different socket designs. We hope that the host of benefits from this design method will enable better prosthetic comfort and care for all people with amputation, and will have a profound effect on those in developing countries.
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October 09, 2022 at 04:33AM
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Overview ‹ Digital Design and Manufacture of a Transtibial Prosthetic Interface — MIT Media Lab - MIT Media Lab
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