Innovating Prosthetics with a Self-Actuated Locking System

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By Marins Med
At Marins Med, our mission is to develop prosthetic devices that truly enhance the daily lives of upper-limb amputees. One of our proudest innovations is the ProHensor (ProHook), which features a cutting-edge self-actuated locking mechanism that addresses a major challenge in voluntary closing (VC) prosthetics—grip fatigue.
The Science Behind Self-Actuated Locking
Research by Llopis et al. (2015) published in the Journal of Rehabilitation Research & Development highlights the critical role a self-actuated locking system plays in maintaining grip force in VC prosthetics. Users are no longer required to continuously exert effort to maintain their grip, which can reduce physical strain during prolonged tasks and enhance overall functionality.
The ProHensor builds on these insights, providing amputees with a device that offers improved control without the burden of fatigue, making it more intuitive and user-friendly. This technological breakthrough addresses a key issue in the adoption of prosthetics, ensuring users can maintain a secure grip during everyday activities without constant exertion.
Modular Design for Efficiency
In addition to the self-actuated lock, the ProHensor introduces a modular design. This innovative feature places the locking mechanism inside a replaceable cartridge. Should the lock need replacement, the cartridge can be swapped out in less than 60 seconds, ensuring that users face no downtime and always have a fully functioning prosthesis.
This quick-change system not only benefits the user but also creates a new revenue stream for prosthetists. Like the razor/razor blade model, the modular design allows prosthetists to schedule regular maintenance visits with their patients, ensuring the prosthetic remains in top condition while addressing any other concerns that may arise.
Improving Prosthetic Care and Adoption
The ability to quickly and easily replace the locking mechanism is more than just a convenience—it promotes ongoing care between amputees and prosthetists. These regular check-ins allow prosthetists to address other issues, such as socket discomfort or skin irritation, fostering a holistic approach to the patient’s health and well-being.
This proactive model helps prevent prosthetic abandonment, a common issue among amputees, by ensuring users have the support they need to stay comfortable and confident with their device.
A Future of Empowerment
At Marins Med, we are dedicated to creating prosthetics that enhance users' lives, and the ProHensor is a testament to that commitment. With its self-actuated locking mechanism and modular design, it’s built to offer superior functionality and longevity, keeping users in control—whether they’re at work, at home, or out in the world.
For more information on the research that inspired our innovations, check out the article by Llopis et al. in the Journal of Rehabilitation Research & Development here.