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Diplosystem ® is the world’s most advanced biomimetic shock protection system allowing to adapt to high velocity shocks by reproducing and amplifying the functionality of the natural anatomy. It meets the needs of greater efficiency than simple systems and significantly improves the protection of individuals and equipment alike.

François SILHOL MD & Serge COHEN MD


Diplosystem was created 5 years ago during a trek in the calanques of Marseille. For those who know this magnificent place, the path is sometimes difficult. I slipped into a scree and my head hit a stone. I found myself with a deep wound; fortunately, I got off with a big bump and a sermon from my wife. My son who was accompanying me then thought "it was better if it broke outside, rather than inside!."

The human body has over the course of evolution selected a very ingenious active mechanism to protect the brain: diplo. The skullcap is made up of two fairly thin strips of bone surrounding a system of bony trabeculae, the diplos, partially bathed in fluid. In the event of an impact, the energy wave is absorbed by the fractured diplos and diffused to the sides by the wave induced in the liquid; the fracture diffuses energy and prevents it from causing brain damage.

While this system is adapted to the shocks to which a reckless walker like me is exposed, the natural evolution of human beings has not had time to adapt to shocks at high velocities.
Thus, despite the excessive number of deaths and handicapped people on the roads around the world, the most important protective accessory for a biker, the helmet, has not benefited from any major technological advance in last 50 years. The same structure that currently makes up the helmets is the same as in the days of our grandparents: a simple polystyrene foam surrounded by two polycarbonate caps, the thickness of which protects the rider during only low-intensity shocks.

As a result of my past experiences in the hospital’s intensive care unit, I imagined that we should take inspiration from nature, which had chosen a precise mechanism over the course of evolution: to diffuse energy rather than attempt to stop it. There was a need to completely rethink the functionality of the helmets: release energy by using the fracture of the diplos and diffuse it, thus protecting the brain optimally.

I was torn between the excitement of an idea and the doubts brought about by such a realization. I had to tell the wisest person I know about it. I naturally went to see my friend Serge Cohen, a doctor and cardiologist like myself, who is wise and above all relentless in his pursuit of innovation. He listened to me talk for a long time about this idea, then he looked at me and simply said: “Our vocation is to save human lives; this idea will allow us to save hundreds of thousands, to reduce the handicapped, the traumatized. Let's go!"

That same evening we started working together, until late at night. Weeks, months and years of work followed, manufacturing prototypes, evaluation by controlled tests by biomechanical engineers, development of an adaptable 3D printing software.

Every day during our consultations with our patients the motivation only grew : wouldn't this injured person have been luckier if we had succeeded in developing this technology earlier ?

walk on the safe side … with us

Traumatic brain injury (TBI) is sudden damage to the brain caused by a blow or jolt to the head. Common causes include car or motorcycle crashes, falls, sports injuries, and assaults. Injuries can range from mild concussions to severe permanent brain damage.

The relationships between helmet deformation and brain injury are not well known. Most of the studies in biomechanical engineering and medicine are related to sports and vehicle collisions, and these investigations are based on a different range of stresses and stress rates from those encountered in the battlefield.


A series of studies emphasizes that one must not overestimate the advantages of helmet use in preventing craniocerebral injury. That means, in terms of protective effectiveness of a helmet, it appears that a helmet does not sufficiently protect against diffuse brain injury induced by rotational acceleration impact to the human head at the moment of impact.


The lifetime economic cost of TBI, including direct and indirect medical costs, was estimated to be approximately $76.5 billion. Additionally, the cost of fatal TBIs and TBIs requiring hospitalization, many of which are severe, account for approximately 90% of total TBI medical costs.


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François is a cardiologist working at Timone’s University Hospital Center in Marseille. He is a specialist in Arterial Hypertension and a leader of the clinical research center for Fibromuscular Dysplasia, a rare vascular disease.

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Serge is a cardiologist working at the European Hospital in Marseille and he is also the president of the French College of Cardiology. In the past 16 years, he worked as a vascular research scientist in Timone Hospital, he founded the first international vascular ultrasound symposium (IVUS) in 1997 (15 editions until 2018). Serge has a strong passion for clinical research.




Brian is former Chief Strategy & Operating Officer of MERCK’s  Healthcare Services & Solutions, and  former Global Leader for Business Development at IBM  WATSON. A Fortune 500 Executive, a serial entrepreneur with multiple  successful exits, and a Senior  Advisor on Artificial Intelligence and  Innovation to several European  governments.

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Fabrice worked as a research scientist  in medtech for more than 12 years in  top-tier institutes worldwide. He was deeply involved in the entrepreneurial scene leading to multiple startup successes including one IPO.
He setup  from scratch and led MonacoTech,  the first and only incubator program  in Monaco. In less than a year, he created a portfolio of 12 hand – selected companies valued over 100M€.

The skull cap is made up of 2 tables of flat bone between which the cancellous bone is inserted, representing more than 60% by volume. He is called Diploé. In the event of a shock, the presence of trabecular traps allows the energy to be absorbed and distributed around the periphery and limits its passage to the brain. This functional anatomy represents the natural adaptation of human evolution over 3 million years to best protect the human brain.


Trauma to the brain can occur as a result of an impact, which can cause a concussion or open skull fracture, or a jarring motion, such as a quick turn or sudden stop. Even seemingly mild head injuries, where you don't lose consciousness, can cause permanent behavioral and cognitive problems, such as memory loss, inability to concentrate, sleep disorders and, in some cases, permanent disability or death.


Current Helmets are designed with an outer shell and a foam layer. This design doesn’t offer sufficient absorption of shock giving a false sense of security while not actually providing the level of protection needed.



A system for damping and diffusing biomimetic energy.


It reproduces the functional anatomy of the cranium allowing the energy to be absorbed and distributed around the periphery of the helmet limiting its passage to the brain. Diplosystem offers significant improvement in shock absorption for all types of helmets for sports, leisure and combat.

The same effect is achieved with ballistic vest, automotive parts or other types of equipment that is likely to sustain a shock.


Simplicity of implementation thanks to digitization on 3D printer allowing rapid prototyping and reduction of manufacturing costs


The Diplosystem can be easily applied to existing products by inserting it into existing helmets, or attached with Velcro to existing ballistic vests.

Helmet without Diplo System ®

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Helmet with Diplo System ®


3D Diplo System ® structure


These BPRX points correspond to the zones :


- B: Frontal

- P: Vertex

- R: Occipital

- X: Lateral

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Fall of a helmet containing a 4.8 kg false head instrumented at a speed of 8.5 m/s on a flat anvil.


Validation of phase tests :

Improvement of the energy diffusion on the majority of the points tested in particular on the frontal and occipital recordings despite the very high velocities tested. A much larger gain is therefore expected for the shocks corresponding to accidents on the public highway.

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Diplo System ® insert



Each helmet was tested on 2 of the 4 BPRX impact points, which makes a total for the 8 helmets of 16 impacts.


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