An active compression bandage based on shape memory alloys: a preliminary investigation

Area of Science:

• Biomedical Engineering
• Materials Science
• Medical Devices

Background:

• Lower extremity swelling disorders are common, causing pain and syncope.
• Current treatments like compression stockings and pneumatic massagers have limitations.
• An active compression bandage (ACB) using smart materials is proposed to address these limitations.

Purpose of the Study:

• To design and prototype an innovative active compression bandage (ACB).
• To utilize smart materials technology for intermittent pressure application.
• To mitigate symptoms associated with lower extremity swelling disorders.

Main Methods:

• An active compression bandage (ACB) actuated by shape memory alloy (SMA) wires was designed and prototyped.
• The ACB was tested on a calf model, applying initial pressure comparable to compression stockings.
• An analytical model based on SMA constitutive behavior was developed and optimized.

Main Results:

• The ACB demonstrated a maximum pressure increase of 40.8% upon SMA wire activation.
• The analytical model accurately predicted ACB performance with <0.32 mmHg difference from experimental results.
• The prototyped ACB achieved an increase in compression up to 9.06 mmHg.

Conclusions:

• The developed ACB can provide initial compression similar to commercial stockings.
• The ACB effectively increases compression through intermittent activation.
• The analytical model is suitable for predicting ACB behavior, aiding future design.