# BIONICOHAND an opensource and collaborative myoelectric hand prothesis

Nicolas Huchet, Côme Butin, Henri Boutard, Christophe Braillon, Yann Corbel, Sébastien Cariou, Charlie Dreano, Christian Fromentin, Jean Forest, Arthur van Haaren, et al.

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## ► To cite this version:

Nicolas Huchet, Côme Butin, Henri Boutard, Christophe Braillon, Yann Corbel, et al. BIONICOHAND an opensource and collaborative myoelectric hand prothesis. IFESS 2025 - 28th Annual Conference of the International Functional Electrical Stimulation Society, May 2025, Chicago, United States. 2025. [hal-05285381](https://hal-05285381)

HAL Id: hal-05285381

https://inria.hal.science/hal-05285381v1

Submitted on 26 Sep 2025

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Distributed under a Creative Commons Attribution 4.0 International License
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# BIONICOHAND
an OPENSOURCE and COLLABORATIVE
MYOELECTRIC HAND PROSTHESIS

MHK
My Human Kit

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RÉPUBLIQUE
FRANÇAISE

Liberté
Égalité
Fraternité

Nicolas Huchet², Côme Butin⁴, Henri Boutard³, Christophe Braillon¹,
Yann Corbel⁵, Sébastien Cariou², Charlie Dreano², Christian Fromentin²,
Jean Forest⁶, Arthur Van Haaren¹, Roger Pissard-Gibollet¹, Christine Azevedo Coste¹
¹CAMIN, INRIA, Univ of Montpellier, France - ²My Human Kit, Rennes, France
³Lycée Saint-Aubin de la Salle, France - ⁴Orthopus, France
⁵OPR, France - ⁶JFTech, France
https://bionico.org

## CONTEXT

Bionicohand (BNH) is a myoelectric prosthesis designed and developed by a community-driven multidisciplinary network formed around an individual with a hand amputation, aiming to closely meet his needs while making technical choices that will eventually make it accessible and acceptable. The features of this open-source hand, as well as its performances, are presented.

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<figure><img src="image_7.png" /><figcaption>Figure 1: BNH 3D model presenting the 2 thumb positions (opposition and lateral)</figcaption></figure>

## METHODS

A single motor activates two grips depending on the thumb positioning (opposition vs lateral). Two electromyographic (EMG) sensors allow control of the hand's opening and closing. BNH is equipped with a universal wrist designed to be used with various tools (knife, screwdriver...). 1 participant with a transradial amputation performed a series of evaluation tests (SHAP test, dynamometry) to compare BNH with his commercial prosthetics (Michelangelo, Ottobock). 2 dynamometers were used for pinch and grip evaluation using different grip sizes. During the 2024 Cybathlon held in Zurich, this hand participated in the ARM discipline events, which involved completing a series of 10 object manipulation tasks representative of real-life situations.

## RESULTS

Execution times to achieve the different tasks of the SHAP test [1] are presented (fig 2). The obtained LIF score [2] is 0,9 for the commercial prosthetics and 0,86 for the BNH prosthetics (1 being the score for a population with no impairment).

The BNH prosthetics was able to deliver a maximum force of **8,9Kg** for the opposition position and **2,7kg** for the lateral position. The commercial prosthetics was able to deliver a maximum force of **7,7Kg** for the opposition position and **6,8kg** for the lateral position.

The user equipped with the Bionicohand was able to complete 9 out of the 10 tasks, placing him second in CYBATHLON competition (Zurich, 2024). Execution times of the different tasks are presented (fig 3).

<figure><img src="image_8.png" /><figcaption>Figure 2: SHAP test tasks execution times for the two prosthetic hands compared to reference value.</figcaption></figure>

## CONCLUSION

Designing high-performing assistive solutions tailored to individual needs, while anticipating their adaptability for a broader user base, is an innovative approach that achieves results nearing performance of commercial prosthetic devices.

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<figure><img src="image_10.png" /><figcaption>Figure 3: Cybathlon 10 tasks execution times (seconds) for the 3 first teams. 2nd bar (green) corresponds to BNH team. https://cybathlon.com</figcaption></figure>

[1] Establishing a standardized clinical assessment tool of pathologic and prosthetic hand function: Normative data, reliability, and validity. C Light, P Chappel, P Kyberg. Archives of Physical Medicine and Rehabilitation 2002. DOI: 10.1053/apmr.2002.32737

[2] The Southampton Hand Assessment Procedure revisited: A transparent linear scoring system, applied to data of experienced prosthetic users. J. Burgerhof, E Vasluian, P Dijkstra, R Bongers, C Van der Sluis. Journal of Hand Therapy 2017. DOI: 10.1016/j.jht.2016.05.001

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MAY 12-16 2025 · CHICAGO, IL USA

REHAB WEEK
2025

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