Universal optimal design in the vertebrate limb pattern and lessons for bioinspired design

Area of Science:

• Biomechanics
• Evolutionary Biology
• Robotics

Background:

• The basic vertebrate limb pattern is evolutionarily conserved but its optimality for diverse functions remains unclear.
• Investigating limb optimality is crucial for understanding evolutionary constraints and bioinspired design.

Purpose of the Study:

• To analyze the versatility and multifunctionality of vertebrate limb design features.
• To provide recommendations for bioinspired robotics and prosthetics based on vertebrate limb biomechanics.

Main Methods:

• Comparative analysis of six vertebrate limbs with contrasting functions (human arm, whale flipper, bird wing, human leg, feline hindlimb, frog hindlimb).
• Identification and tabulation of 52 biomechanical design features.

Main Results:

• The fundamental vertebrate limb pattern is highly versatile and optimal across various functions, including locomotion, manipulation, flight, and swimming.
• Key design features include segmented bones for shape morphing and linkage mechanisms for motion control and mechanical advantage.

Conclusions:

• The vertebrate limb's inherent design offers significant potential for bioinspired robotic and prosthetic limb development.
• Advancements in soft actuators further enhance the feasibility of creating sophisticated bioinspired limbs.