BionicM Closes $4.5 Mn to Expand Powered Prosthetic Leg Production

Nov 2, 2026 | By Nguyen Minh

Japanese medical technology startup BionicM has Closes US$4.5 million in the first close of its Series B funding round. The investment was led by B Dash Ventures and Mitsubishi UFJ Capital, with participation from overseas and individual investors. The company will use the funding to increase production, marketing and sales of its powered prosthetic knee, ASISTA, ahead of its planned US launch in 2027.

BionicM Develops Powered Prosthetic Legs Using Robotics

Founded from research at the University of Tokyo, BionicM develops powered prosthetic legs using humanoid robotics technology. Its products are designed to support movement and help people with lower-limb amputations improve their mobility.

Its existing product, Bio Leg, has received US FDA Class II medical device registration and approval for insurance reimbursement in the US. The company has also established a US sales operation to expand its business.

Funding to Support ASISTA's US Launch

The newly raised capital will support the production of ASISTA, BionicM's next-generation powered prosthetic knee. The company plans to launch the product in the US market in 2027.

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ASISTA is designed to assist both knee bending and straightening through motor-based technology. Unlike conventional microprocessor-controlled prosthetic knees that mainly provide passive control, the product aims to actively support movements such as walking, climbing stairs, using slopes and sitting down.

Growing Demand for Powered Prosthetics

The US prosthetics market is seeing growing demand for advanced devices as the number of people with diabetes increases and the prosthetic user population ages.

In 2025, the US introduced a new billing code for electromechanical prosthetic knees, supporting the wider adoption of motor-powered devices. BionicM believes this development could create new opportunities for its technology.

About BionicM

BionicM is a Japan-based medical technology startup founded in December 2018. Established using research developed at the University of Tokyo, the company focuses on powered prosthetic legs that combine robotics and human movement.

Led by CEO Sun Xiaojun, BionicM aims to improve mobility and quality of life for people with lower-limb amputations through advanced prosthetic technology.