Vol. 5 (Part 2) | What is kegg? Can it not be a medical device? Yet, we didn't give up. The 10 years spent grappling with kegg and the Japanese system [Amina's Lense]

Mar 2, 2026
Amina’s Lens|Medical Device & Social Implementation

kegg
Products don't reach people just by being made.

kegg is a fertility device that measures changes in cervical mucus and records the body's signs approaching ovulation.
This article looks back at the background behind the notification as a general medical device, the medical device notification number, and the social implementation of a product related to women's health.

Click here for the kegg product page.

View kegg product page
※You will be redirected to an external site. Please check the latest information on the product page for product information, sales status, and precautions for use.
General Medical Device It has been registered in Japan as a general medical device, "Household Cervical Mucus Measurement Device."
Medical Device Notification Number Medical Device Manufacturing and Sales Notification Number: 13B2X10428006001
Fertility Device Measures changes in cervical mucus and records the body's signs approaching ovulation with an app.
Social Implementation A challenge to bridge the gap between systems and culture and deliver it as an option for home use.

1|Products don't reach people just by being made.

No matter how good a product is, it won't spread in society just by being made.

This is especially true for products related to women's health, which often encounter systemic and cultural barriers.

kegg was no exception.

The first challenge we faced was the systemic barrier.

A device inserted into the vagina.
It may indicate the approximate time of ovulation.

What category would it fall under in Japan?

Medical device?
Or something else?

The decision was by no means easy.


(In 2017, I participated in a kegg photo shoot when I first met Kristina.)

2|The Choice of a General Medical Device

When I decided to bring kegg to Japan, the first thing I did was consult the Ministry of Health, Labour and Welfare.

In the US, kegg is treated as an FDA-registered medical device.
However, Japan has its own criteria for judgment.

A device inserted into the vagina.

"Is it a miscellaneous good?"
"Is it treated as a pleasure device?"

If so, it would be difficult to properly convey its efficacy, safety, and quality.

On the other hand, if it became a controlled medical device, the hurdles for approval would be higher, and it would take more time and cost to sell.

As a result, there was a possibility that it would become less accessible to those who truly needed it.

This is not for medical institutions only,
I want to make it available to society as an option for home use.

However, at the time, Japan's Pharmaceutical and Medical Device Act did not have a framework that anticipated products like kegg.

Even if we wanted it to be a medical device, there was no such category.

So we persevered in our discussions.

With the cooperation of Diet members, we formed a parliamentary league and engaged in repeated dialogues with the Ministry of Health, Labour and Welfare.

In 2023, a new generic name was created.

A new generic name, "Household Cervical Mucus Measuring Device," was established under the Pharmaceutical and Medical Device Act.

In 2024, kegg completed its registration as a general medical device.

Medical Device Manufacturing and Sales Notification Number: 13B2X10428006001

And in 2026, kegg's expansion in Japan began.

Rather than avoiding regulations,
Find the most rational place within the regulations.

That was the form we aimed for.

(With Minister of Health, Labour and Welfare Kato in 2022)
(With Minister of Economy, Trade and Industry Saito in 2024)

3|The Reality of Fertility Treatment in Japan

Japan is one of the countries with a high number of infertility treatments, including in vitro fertilization.

However, the burden surrounding fertility treatment and infertility care has not yet been sufficiently reduced.

(Source: ICMART World Report 2016 / International Committee for Monitoring Assisted Reproductive Technologies)

The age of first childbirth is rising, the number of dual-income households is increasing, and the burden of hospital visits is significant.

Women bear the brunt of much of this.

The problem is not just cost.

  • Knowing one's condition early
  • Judging the timing to proceed with necessary medical treatment
  • Reducing unnecessary burden

This flow is not yet sufficiently streamlined.

kegg is not a treatment.

However, it has the potential to prepare the groundwork before treatment.

Instead of merely "groping by feel," it creates an opportunity to understand one's body rhythm through daily data.

4|The Future of Data

Today, kegg has grown into a company with one of the world's largest cervical mucus databases.

This is not just about "a lot of data."

Cervical mucus is one of the biological signs that reflect hormonal changes.

It changes throughout the menstrual cycle and is related to hormonal fluctuations not only during the period of considering pregnancy but also postpartum and around menopause.

What if we could accumulate such changes
as a "line" rather than just "points"?
  • Understanding your cycle trends faster
  • Noticing changes in postpartum hormone balance
  • Being able to describe pre-menopausal fluctuations in your own words

Such possibilities are gradually emerging.

Furthermore, through the combination of large-scale data and AI, changes in the body that have previously been described as individual sensations may be organized as statistical trends.

For example, we might see changes such as these:
  • The relationship between diet or stress and cervical mucus changes
  • Patterns of cycle fluctuations
  • The range of changes at different life stages

Everyday data, which medical and research institutions have not been able to fully obtain, is now being collected from daily life.

5|Data is not a panacea

However, data is not a panacea.

Data does not replace the body.
It merely complements it.

Respecting both quantitative data and subjective sensations.

And only when the following three conditions are met does data become valuable:

  • Transparency
  • Designed to avoid misunderstanding
  • Appropriate connection with medical care when needed

Precisely because it is a fertility device related to women's health, it needs to be designed not only for convenience but also to include connectivity with systems, information, and medical care.

6|Finally

It's been about 10 years since we first met in 2017.

It was a time of structural change rather than technological advancement.

To place women's health within the continuum of daily life, rather than isolating it as something special.

To arrange the right tools and the right framework.

A society that continues to consider fertility efforts as "something to strive for,"
and a society that increases "sustainable designs."

Which future is more peaceful and sustainable?

I am still in the midst of this inquiry.

Placing Options Within the System

The social implementation of kegg was not merely about bringing an overseas fertility device to Japan.

It involved the framework of a general medical device, a medical device notification number, language to convey safety and quality, and a design as an option for home use.

To deliver a product to society, I believe it's necessary to build bridges between technology, systems, and culture.

This article is intended to provide information on kegg, fertility devices, general medical devices, and social implementation. kegg is not intended to diagnose or treat infertility. If you have concerns about irregular periods, abnormal bleeding, severe pain, infertility treatment, or pregnancy, please consult a medical institution. For product usability, usage instructions, contraindications, and precautions, please refer to the latest information on the product page and in the accompanying documents.

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