Shape Memory Alloys for Controllable Compression Textiles and Garments

Technology #17392

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Inventors
Professor Dava Newman
Department of Aeronautics And Astronautics, MIT
External Link (aeroastro.mit.edu)
Bradley Holschuh
Department of Aeronautics And Astronautics, MIT
Luca Levrino
Department of Aeronautics And Astronautics, MIT
Giacomo Gatto
Department of Aeronautics And Astronautics, MIT
Managed By
Ben Rockney
MIT Technology Licensing Officer
Patent Protection

Wearable, Self-Locking Shape Memory Alloy (SMA) Actuator Cartridge

PCT Patent Application WO 2016-077150

Wearable, Self-Locking Shape Memory Alloy (SMA) Actuator Cartridge

US Patent Pending
Publications
Materials and Textile Architecture Analyses for Mechanical Counter-Pressure Space Suits using Active Materials
American Institute of Aeronautics and Astronautics Space Conf. Expo., Pasadena, CA, USA. 2012.
Two-spring model for active compression textiles with integrated NiTi coil actuators
Smart Materials and Structures, 24, 3 (2015): 035011.
Low Spring Index NiTi Coil Actuators for Use in Active Compression Garments
SPIE MOEMS-MEMS , 897505-897505. International Society for Optics and Photonics, 2014.

Applications

  • In healthcare: garments for management of diabetes; garments to improve blood circulation; garments for burn management; post-surgical compression garments to aid in recovery after a surgical procedure
  • In athletics: garments for improvement of oxygen circulation  
  • In emergency medicine: garments to tourniquet active wounds
  • In space: compressive space suits to provide required pressurization to an astronaut’s body
  • In cosmetics: body shapewear

Problem Addressed

Functional textiles, such as compression textiles, hold significant promise for a variety of industries, including but not limited to, athletics, healthcare and space. Existing approaches towards implementation of compression textiles rely exclusively on the pneumatic bladders and tight-fitting passive materials. None of the existing technological solutions, though being advantageous in specific circumstances, allows for implementation of lightweight and well-fitted compression textiles that provide active control over the compression process.

Technology

This work presents the first kind of lightweight compression textiles that provide users with an active control over the compression process. The textiles consist of compression elements made in a form of springs that are woven into the fabrics. The actuators utilize the shape memory effect in order to produce compression motion and are fabricated using Nickel and Titanium materials. The springs are ‘trained’ to conform to a preprogrammed shape upon direct electrical stimulation and return to its original shape when stimulus is removed. Shape of the compression garments changes according to the way actuation springs are woven into the garments.

The invention includes a cartridge that spatially arranges actuators within textiles and locks them in a compressed state once they are actuated. The cartridge also provides customizable interfaces required for interaction of actuators with fabrics.

Advantages

  • Active control over the process of compression
  • Form-fitting ability
  • Lightweight
  • Electrically-driven compression
  • Unique textile architectures capable of producing compression in a variety of directions
  • Multipurpose compression garments with possibility to be used in a variety of applications