The Grip Has to Hold

By Marins, Inc. 

Body-powered prosthetics have always had a quiet advantage: immediate response, low maintenance, direct physical connection to the work. The clinical community is finally catching up to what long-term users have known for decades.

But voluntary closing — for all it changed — has a physics problem.

To hold something, the user must maintain harness tension. Throughout the task. The moment that tension releases, so does the grip. That is not a product flaw. It is a mechanism limitation. And it is a primary reason users report fatigue, compensatory movement, and eventually, abandonment.

Acceptance rates remain stubbornly low. Users learn to work around their devices rather than with them.

The question worth sitting with is: why?

What Holding Actually Requires

Marins co-founder and inventor Darryl DuBre is a long-term upper-limb amputee who moved through roughly forty body-powered devices over his lifetime. He did not set out to build a product. He set out to close a gap he had lived inside for two decades.

The ProHensor® is the result. The first modular voluntary closing auto-locking terminal device. It closes voluntarily. It locks automatically. No sustained tension required to maintain grip. The user initiates. The device holds.

One of our early patients — J.P., a commercial pilot — regained his SACAA-regulated license after fitting the ProHensor®. Not because it is complicated. Because it is dependable.

Daily life does not ask for dramatic outcomes. It asks for a grip that stays.

Why This Moment Matters

The ProHensor® carries CE marking, FDA registration, and patent protection through 2041. It has secured reimbursement through workers' compensation and private insurance. It is available now.

The field is ready for a device that delivers what voluntary closing promised.

Hold Fast.

Suzen DuBre CEO and Co-founder, Marins, Inc.