Multi-Indenter Device for in Vivo Biomechanical Tissue Measurement

Area of Science:

• Biomedical Engineering
• Biomechanics
• Prosthetics and Orthotics

Background:

• Biomechanical properties of residual limb tissues are critical for prosthetic socket design.
• Accurate characterization of these properties is essential for improving prosthetic fit and function.
• Current methods may lack the precision needed for comprehensive tissue analysis.

Purpose of the Study:

• To present and evaluate a novel multi-indenter platform for residual limb tissue characterization.
• To assess the platform's performance in measuring hyperviscoelastic tissue properties.
• To demonstrate the utility of the platform for prosthetic socket development.

Main Methods:

• Development of a novel indenter platform with 14 circumferentially arranged, individually controllable actuators.
• Actuators capable of precise position and force control (accuracy: [Formula: see text] and 330 mN, respectively) at a 500 Hz feedback rate.
• Data acquisition from 162 sensors via EtherCAT fieldbus to capture hyperviscoelastic responses from transtibial residual limbs.

Main Results:

• The multi-indenter platform successfully characterized the mechanical hyperviscoelastic tissue response of two transtibial residual limbs.
• Force versus deflection data, including key hyperviscoelastic properties, were obtained at five distinct anatomical locations.
• The system demonstrated accuracy and versatility in measuring residual limb tissue properties.

Conclusions:

• The novel multi-indenter platform is a versatile and accurate tool for residual limb tissue characterization.
• This technology holds significant potential for advancing the quantification and design of prosthetic sockets.
• Improved prosthetic socket production can be achieved through precise biomechanical tissue property measurements.