Share this project


Share this project

World's most affordable and reliable head impact sensors for concussion awareness. Works on any helmet. If it's red, check your head!
World's most affordable and reliable head impact sensors for concussion awareness. Works on any helmet. If it's red, check your head!
151 backers pledged $30,944 to help bring this project to life.
Last updated


Tozuda Head Impact Sensor for Concussion Awareness project video thumbnail
Replay with sound
Play with

Tozuda Head Impact Sensor for Concussion Awareness



What is a prototype?

A prototype is a preliminary model of something. Projects that offer physical products need to show backers documentation of a working prototype. This gallery features photos, videos, and other visual documentation that will give backers a sense of what’s been accomplished so far and what’s left to do. Though the development process can vary for each project, these are the stages we typically see:

Proof of Concept

Explorations that test ideas and functionality.

Functional Prototype

Demonstrates the functionality of the final product, but looks different.

Appearance Prototype

Looks like the final product, but is not functional.

Design Prototype

Appearance and function match the final product, but is made with different manufacturing methods.

Production Prototype

Appearance, function, and manufacturing methods match the final product.

Project supporting material callout image

Prototype Gallery

These photos and videos provide a detailed look at this project’s development.

At Tozuda, we design head impact sensors to raise concussion awareness, indicate potential injury, and emphasize proper precautionary measures to aid injury recognition.

Tozuda sensors allow you to make safety a priority and keep your focus on the tasks that demand it. Ease your concussion worries in the activities you enjoy everyday. Our sensors are affordable, simple, objective, and versatile—ideal for any sport, commute, job-site, or service. All you have to do is remember our simple motto: 

At Tozuda, we manufacture head impact sensors with you, our user, in mind.

You don’t want complicated, so we made it simple. Just attach the sensor on to any helmet or headgear, and it will indicate when a sustained impact is potentially concussive. Easy to attach and easy to read, you’ll be sure to know when you need to take action.

You don’t want expensive, so we made it affordable. Eliminating electronic parts in our sensors makes sense for us both; we reduce costs by using only mechanical parts, and simplify the process by removing batteries, wifi, and charging from the equation. Additionally, our sensors can help you identify a concussion faster, saving you from spending more on medical costs and other indirect expenses that arise.

You don’t want a hidden injury, so we made it clear and tamper-proof. Tozuda sensors can’t be concealed, covered, or changed; indicating objectively and reliably when you should be assessed for a head injury. Our sensors are transparent by design—encouraging users, athletes, and coaches alike to be transparent about the severity of every impact sustained and the reality of traumatic brain injuries.

A Traumatic Brain Injury, or TBI, can devastate a career or an entire community, yet the stigma of these injuries can sometimes keep victims from speaking up or seeking help. Safety shouldn’t hold you back, and Tozuda sensors won’t. We created our sensors to fit onto any helmet and into any routine—giving you piece of mind without hindering your hustle. This means you can keep your focus on what matters, and spend less time bracing for a TBI.

CONCUSSIONS AND LOSS OF CONSCIOUSNESS—It is widely believed that concussions and TBIs must involve a loss of consciousness; however this is one of the main misconceptions that leads to delayed or missed diagnoses. The University of Pittsburgh Medical Center reports that more than 90% of concussions are not accompanied by a loss of consciousness. UPMC’s research also indicated that concussions diagnosed without a loss of consciousness could lead to longer recovery periods, compared to those whose concussions did involve unconsciousness.

CONCUSSION PROBABILITY—Research from the Department of Orthopaedics at Brown University details concussion probability based on the varying G forces of more than 161,000 tested collisions. According to this data, an impact with a measured acceleration of 75 Gs has a 50% chance of causing a concussion in adults. Tozuda sensors activate at 85 Gs; for adults, this would indicate a 60% likelihood of concussion.

SECOND IMPACT SYNDROME—While concussions can be damaging, second-impact syndrome is exponentially more dangerous. Second-impact syndrome, or SIS, occurs when one sustains a second concussion before an initial concussion has healed. SIS causes the brain to swell suddenly, and with devastating consequences. The majority of cases are fatal, and of the few survivors, most are left seriously disabled. With SIS, time between concussions can range from minutes to weeks; this is why it is so important to wait to return to play until a concussion or brain injury can fully heal.

SENSE—Tozuda sensors can detect forces in any direction within milliseconds of impact. Concussions occur when an impact to the head or body causes the brain to move inside of the skull; most concussions and traumatic brain injuries are caused by rotational and linear forces. Tozuda sensors withstand regular helmet use and minor impacts, but can detect when a hit is potentially concussive, such as a direct blow to the helmet, or a rotational hit which causes the head or neck to twist.

ACTIVATE—Our sensors are mechanically activated when linear or rotational accelerations exceed the threshold of 85 Gs of force. This trigger point was determined using data from the Department of Orthopaedics at Brown University which found that impacts of 75 Gs were 50% likely to be concussive. Direct contact and impact from inertial forces trigger the sensor to activate, meaning the sensor can detect concussive hits even when the head isn’t struck. Once activated, Tozuda sensors release a simple, non-toxic mix of liquid and dye, changing in color from clear to red.

INDICATE—Tozuda sensors measure the force of an impact and indicate when an athlete should be evaluated before returning to the field—no sensor on the market today is able to fully detect or prevent concussions. This allows users to clearly identify when an impact is especially dangerous–exceeding 85 Gs–and prevents users from exacerbating an injury when they might not even know they have one. With the ability to alert users of major linear and rotational forces, the sensors can clearly and reliably indicate a potential concussion, even when other symptoms aren’t present.

 SIMPLE—Tozuda sensors are easy to use and understand—with a straightforward attachment process and clear activation, our sensors make it obvious when you need to take action.

AFFORDABLE—Thanks to Tozuda’s patented technology, our uniquely designed sensors function reliably without the use of electronics, which keeps costs low for everyone.

OBJECTIVE—The sensors’ unambiguous indicator keeps athletes and coaches accountable about the severity of each and every impact. Anyone can intervene when a sensor has been activated, including teammates, coaches, referees, and even opponents.

VERSATILE—Our sensors’ versatile design brings safety and a sense of security to any setting—not only on helmets in sport, but also on hard hats in construction, or other headgear protecting you while on duty.

For those who are hard-headed like us, we know how difficult it can be to sit yourself out when you want to keep going. It isn’t easy to admit an injury, but denying a concussion can lead to extended symptoms and healing time, increased risk for further complications, and even death. As our founder Jessie puts it: “would you rather sit out the game or the season?” Our sensors give users the information they need to make informed decisions to protect their heads. By purchasing or gifting a head impact sensor, you can help spread concussion awareness and encourage others to take note.

 At Tozuda, we design tools to make the world safer. We make impact sensors to bring you peace of mind and alert you when an impact is potentially devastating, no matter the setting. Our team, fueled by the passion of our founder Jessie Garcia since 2015, aims to raise concussion awareness and help reduce the frequency of traumatic brain injuries and the severity of their impacts. Tozuda is based in Philadelphia and brings visibility to concussion awareness around the world. Our name, Tozuda, means hard headed (in a determined way!) and epitomizes our mission—to encourage you to STAY TOZUDA and never lose sight of your goals, no matter what gets in your way.

At Tozuda, we see the value in participating in sports and recreational activity—physically, mentally, and socially. Some of our fondest memories come from playing! Our goal is to continue encouraging sports participation while raising awareness of this one specific injury, concussions. Concussions are something to take seriously, the key to successful recovery is recognition and proper treatment. That is why we plan to:

  • Educate on the dangers, signs, and symptoms of TBIs and concussions 
  • Emphasize prevention and prioritizing safety to reduce the frequency of sustained brain injuries
  • Encourage users to get medical attention when needed and to prioritize the brain’s wellness along with the body's health

To contact our team, send us an email at [email protected].

For wholesale opportunities, contact John Pettit at [email protected].

For media inquiries, contact Katie Burger at [email protected]

Additional information can be found in our press kit or on our press page.

Risks and challenges

We are incredibly excited to be bringing the Tozuda Head Impact Sensor to you, the Team Tozuda community, this year. From the onset of this product, we were determined to make safety and head impact sensors accessible to everyone. More than 3 years of research, development, and testing have gone into this product’s core technology and we are positive it will be a great tool in all of your activities.

With that being said, we will be preparing for any issues that may arise during the campaign and regarding fulfillment. We are committed to your complete satisfaction with our head impact sensors. We plan on keeping all of our backers up to date on our manufacturing milestones and order updates.

PRODUCT MANUFACTURING—At Tozuda, we manufacture all of our sensor’s components in our facility in South Philadelphia, PA to maintain the utmost quality control of our sensor’s functionality. Each batch of sensors are tested and inspected prior to shipment. Moreover, we’ve field tested our sensor on over 300+ beta users who used our device in action who can attest to the quality product we produce.

We will be ordering all of our raw materials for our initial production run and cutting our injection mold plates upon the campaign’s success. We will then send out a survey to all our backers to make sure our device is calibrated appropriately for level of play. We will stay on top of our communications with our vendors to ensure a quick transition into production and assembly.

SHIPPING—As soon as your sensors have gone through our testing and quality control procedures, our team in Philadelphia will begin shipping packages to our backers.

QUALITY ASSURANCE—Our standard at Tozuda is to test and inspect each and every device we ship. We want our backers to feel completely satisfied with the Tozuda Head Impact Sensor. We will replace any defective device for a backer.

PRODUCT WARNING—WARNING: This device is intended to measure force of impact and is not a medical device or diagnostic tool by any meaning. Force of impact is one of many indications of potential injury and/or concussion. If any indications of a concussion are present, promptly see a licensed medical doctor for diagnosis and treatment. Use this device as directed and only for the use of measuring force of impact. You should seek medical attention for any injury or concussion that occurs while wearing this device. Tozuda has no control over the activities that may cause the injury or concussion and cannot provide any medical advice or treatment.

Learn about accountability on Kickstarter
Questions about this project? Check out the FAQ

Funding period

- (30 days)

Line icon alert icon Artboard Copy 8 arrow-down icon arrow-down arrow-left icon arrow-left arrow-point-left icon Fill 1 Copy 5 arrow-point-right icon Fill 1 arrow-right icon arrow-right arrow-up-right icon icon--arrow-up-right copy bar-chart icon Artboard Copy 6 bell icon Combined Shape Copy 5 book icon Artboard Copy 3 bookmark icon Fill 1 brand-assets icon Artboard Copy 13 cart icon Artboard Copy 4 chat icon chat check icon Fill 1 Copy 6 circle-back icon Fill 1 Copy 13 circle-forward icon Fill 1 Copy 16 circle-k icon circle-k circle-left icon circle-left circle-right icon circle-right clipboard icon Artboard Copy 12 clock icon Combined Shape close icon close closed-caption icon Fill 1 compass icon Combined Shape Copy 2 conversion icon conversion delta-down icon Fill 1 delta-left icon delta-right icon Fill 1 delta-up icon Fill 1 duplicate icon duplicate embed icon Combined Shape Copy 6 eye icon Combined Shape Copy 12 facebook-contained icon Facebook Contained facebook icon Facebook logo flag icon Fill 1 Copy 3 gear icon Fill 1 Copy 14 global-africa icon Fill 1 Copy 9 global-america icon Fill 1 Copy 10 global-asia icon Fill 1 Copy 17 graph-bar icon Combined Shape Copy 9 graph-line icon Combined Shape Copy 16 heart icon Fill 1 Copy 8 help icon human icon icon--human icon--activity-feed.kds icon icon--add-heading.kds icon icon--advanced-analytics.kds icon icon--alarm icon icon--alarm icon--alert icon icon--alert icon--alt-text.kds icon icon--arrow-down.kds icon icon--arrow-down icon icon--arrow-down icon--arrow-left-2 icon icon--arrow-left.kds icon icon--arrow-left icon icon--arrow-left icon--arrow-right.kds icon icon--arrow-right icon icon--arrow-right icon--arrow-up-right icon icon--arrow-up-right icon--arrow-up.kds icon icon--arrow-up icon icon--arrow-up icon--backer-badge icon icon--backer-badge icon--bar-graph.kds icon icon--bell.kds icon icon--bell icon icon--bell icon--bold.kds icon icon--bolt.kds icon icon--bolt icon icon--bolt icon--bookmark-filled.kds icon icon--bookmark-outline icon icon--bookmark-outline icon--bookmark.kds icon icon--bookmark icon icon--bookmark icon--bulleted-list.kds icon icon--calculator icon icon--calculator icon--calendar-check icon icon--calendar-check icon--calendar.kds icon icon icon--calendar icon icon--calendar icon--campaign-outline icon icon--campaign-outline icon--caption.kds icon icon--captions.kds icon icon--cart.kds icon icon--category.kds icon icon icon--chat.kds icon icon--check.kds icon icon icon--check icon icon--check icon--chevron-down.kds icon icon icon--chevron-down icon icon--chevron-down icon--chevron-left.kds icon icon icon--chevron-left icon icon--chevron-left icon--chevron-right.kds icon icon icon--chevron-right icon icon--chevron-right icon--chevron-up.kds icon icon icon--chevron-up icon icon--chevron-up icon--circle-around.kds icon icon--circle-around icon icon--circle-around icon--circle-back icon icon--circle-back icon--circle-backward.kds icon icon--circle-check icon icon--circle-empty icon icon--circle-forward.kds icon icon--circle-forward icon icon--circle-forward icon--circle-loader icon Page 1 icon--circle.kds icon icon--circle icon icon--clipboard icon icon--clipboard icon--clock.kds icon icon icon--clock icon icon--clock icon--close.kds icon icon icon--closed-caption icon icon--closed-caption icon--code icon icon--code icon--collapse.kds icon icon--collapse icon icon--collapse icon--commissions icon icon--commissions icon--compass icon icon--compass icon--confirmation icon icon--confirmation icon--conversion.kds icon icon--conversion icon icon-conversion icon--copy.kds icon icon--cpu icon icon--credit-card.kds icon icon--credit-card icon icon--cross icon icon--cross icon--curve-right icon icon--curve-right icon--date-and-time.kds icon icon icon--delta-down icon icon--delta-down icon--delta-left icon icon--delta-left icon--delta-right icon icon--delta-right icon--delta-up icon icon--delta-up icon--download.kds icon icon--download icon icon--download icon--drag.kds icon icon--edit.kds icon icon--ellipsis.kds icon icon--ellipsis icon icon--error.kds icon icon icon--expand.kds icon icon--expand icon icon--expand icon--external.kds icon icon icon--external icon icon--external icon--eye icon icon--eye icon--facebook icon icon--facebook icon--filter icon icon--filter icon--filters.kds icon icon--flag-outline icon icon--flag.kds icon icon icon--flag icon icon--flag icon--forward-fund icon icon--frown-filled icon icon--frown icon icon--fulfillment.kds icon icon--gear icon icon--gear icon--globe-africa icon icon--globe-africa icon--globe-america icon icon--globe-america icon--globe-asia icon icon--globe-asia icon--globe.kds icon icon--graph-bar icon icon--graph-bar icon--graph-line icon icon--graph-line icon--hamburger.kds icon icon--hamburger icon icon--happy-filled icon icon--happy icon icon--header-anchor icon icon--heading.kds icon icon--heading icon icon--heart-filled.kds icon icon icon--heart-outline icon icon--heart outline icon--heart-thin-outline icon Fill 1 icon--heart.kds icon icon icon--heart icon icon--heart icon--heartstrings-and-hardbacks icon icon--hide.kds icon icon--home-with-door icon icon--home.kds icon icon--home icon icon--home icon--human.kds icon icon icon--human icon icon--human icon--humans.kds icon icon--humans icon icon--humans icon--image.kds icon icon--image icon icon--image icon--inbox.kds icon icon--inbox icon icon--inbox icon--indeterminate icon icon--info.kds icon icon icon--info icon icon--info icon--instagram icon icon/instagram icon--intermediate.kds icon icon icon--italic.kds icon icon--late-pledges.kds icon icon icon--lightbulb.kds icon icon--lightbulb icon icon--lightbulb icon--line-graph.kds icon icon--link.kds icon icon--link icon icon--link icon--location.kds icon icon icon--lock-black-bg icon lock-icon icon--lock icon icon--lock icon--locked.kds icon icon icon--log-out.kds icon icon--long-story-short icon icon--mail icon icon--mail icon--make-100 icon icon--media-embed.kds icon icon--meh-filled icon icon--meh icon icon--menu icon icon--menu icon--message.kds icon icon--message icon icon--message icon--milestone-dfm icon icon--milestone-idea icon icon--milestone-preprod icon icon--milestone-prod icon icon--milestone-proof-of-concept icon icon--milestone-working-prototype icon icon--minus.kds icon icon--mobile.kds icon icon--mobile icon icon--mobile icon--mute.kds icon icon--numbered-list.kds icon icon--order-management.kds icon icon--overflow icon icon--overflow icon--pause.kds icon icon--pause icon icon--pause icon--pencil icon icon--pencil icon--pie-chart icon icon--pin.kds icon icon--pin icon icon--pin icon--pinterest icon icon--pinterest icon--play-filled.kds icon icon--play.kds icon icon--play icon icon--play icon--pledges.kds icon icon--plus-human.kds icon icon--plus-human icon icon--plus-human icon--plus.kds icon icon--plus icon icon--plus icon--prohibit icon icon--prohibit icon--prohibited.kds icon icon--project-budget icon icon--project-we-love icon icon--pull-quote icon icon--pull-quote icon--pullquote.kds icon icon--question-filled icon icon--question-filled icon--question.kds icon icon--question icon icon--question icon--reorder icon icon-reorder icon--reply.kds icon icon--reply icon icon--reply icon--reward.kds icon icon icon--reward icon icon--save icon icon--save icon--saved icon icon--saved icon--search.kds icon icon--search icon icon--search icon--section-break icon icon--section-break icon--sentiment-neutral-filled.kds icon icon--sentiment-neutral.kds icon icon--sentiment-satisfied-filled.kds icon icon--sentiment-satisfied.kds icon icon--sentiment-unsatisfied-filled.kds icon icon--sentiment-unsatisfied.kds icon icon--settings.kds icon icon--shipping.kds icon icon--show.kds icon icon--small-k icon icon--sound-hi icon icon--sound-hi icon--sound-lo icon icon--sound-lo icon--sound-mute icon icon--sound-mute icon--spinner.kds icon icon--star-outline icon Star Outline icon--star.kds icon icon icon--star icon icon--star icon--stopwatch.kds icon icon--subtitles-captions icon icon--subtitles-captions icon--success.kds icon icon icon--survey-multiple-choice.kds icon icon--survey-open-text.kds icon icon--survey-single-choice.kds icon icon--survey.kds icon icon--tax-documents.kds icon icon--text-bold icon icon--text-bold icon--text-bullet icon icon--text-bullet icon--text-italic icon icon--text-italic icon--textalign-centered icon icon--textalign-centered icon--textalign-right icon icon--textalign-right icon--thumbs-down icon icon--thumbs-down icon--thumbs-up icon icon--thumbs-up icon--thumbsdown-outline icon icon--thumbsdown-outline icon--thumbsup-outline icon icon--thumbsup-outline icon--timeline-to-do.kds icon icon--trash.kds icon icon--trash icon icon--trash icon--tumblr icon icon--tumblr icon--twitter icon icon--twitter icon--unlink.kds icon icon--unlink icon Artboard icon--unlock icon icon--unlock icon--unlocked.kds icon icon icon--update-freeform-round icon icon--update-freeform-round icon--update-freeform icon icon--update-freeform icon--update-pinned icon Artboard icon--update-qa-round icon icon--update-qa-round icon--update-qa icon icon--update-qa icon--upload.kds icon icon--upload icon icon--upload icon--video.kds icon icon--video icon icon--video icon--volume-down.kds icon icon--volume-up.kds icon icon--warning.kds icon icon icon--warning icon icon--witchstarter icon icon--youtube icon icon--youtube icon--zine-quest icon icon-imagealign-center icon icon-imagealign-center icon-imagealign-left icon icon-imagealign-left icon-imagealign-right icon icon-imagealign-right info icon Combined Shape Copy instagram icon instagram copy kickstarter icon Artboard Copy 5 leaf icon leaf lightbulb icon icon--lightbulb link icon Combined Shape Copy 8 loading-spin icon lock icon Combined Shape Copy 4 mail icon Combined Shape map-pin icon Fill 1 menu icon Group message icon Fill 1 Copy 12 mobile icon Page 1 Copy 2 pause icon pause copy pencil icon Combined Shape Copy 3 pin icon Combined Shape Copy 11 pinterest icon pinterest play icon play copy plus-human icon icon--plus-human plus icon Fill 1 Copy 7 question icon Combined Shape Copy 14 search icon Fill 1 Copy 11 shapeshift icon share icon Fill 1 Copy slash icon solid-arrow icon solid-arrow sound-hi icon Combined Shape sound-lo icon Combined Shape sound-mute icon Combined Shape star icon Fill 1 Copy 2 stopwatch icon Group 2 thumbs-up icon Shape tools icon Shape trash icon Combined Shape tumblr icon tumblr copy twitter icon twitter copy user icon Artboard Copy 10 volume-up icon Artboard Copy 9 warning icon Combined Shape Copy 10 write icon Artboard Copy 11 x icon Fill 1 Copy 4 youtube icon Combined Shape