1｜A Teaspoonful of Discomfort

It is sometimes said that the total amount of female hormones is about a teaspoonful.

That tiny amount affects our body temperature, mood, and even concentration. Yet, we live almost completely "unaware" of these changes.

At that time, home testing kits that required pricking a finger to draw blood were starting to emerge. I tried one myself, but even with a tiny needle, I was scared and couldn't do it alone.

And most importantly, that data was just a "point."

Our bodies change like waves all day long, yet we only understand them in fragments. This feeling of unease lingered deep in my mind.

2｜Impli: The Option of an "Implantable Sensor"

Impli is a small sensor developed for women undergoing in vitro fertilization (IVF), designed to be implanted subdermally.

In short, it's a medical technology for "continuously measuring" hormones.

Until now, IVF has involved blood tests at each hospital visit, with decisions made based on the values from that day.

Impli quietly challenges that premise.

The word "implant" carries a bit of tension. But what lies beyond is the idea of viewing the body as a continuous flow, not just as fragments.

3｜The Premise of Blood Sampling, Once Taken for Granted

In IVF, delicate hormone control is key to treatment. That's why hospital visits and blood tests are repeated.

This structure has long been accepted as a matter of course. However, the body is constantly changing continuously.

Because measurement methods were limited, the design of medical care was constructed within those confines.

Impli is precisely an attempt to review this "measurement design."

4｜When the Measurement Design Changes

Its novelty isn't in the sheer volume of numbers.

With continuous data, the movement of hormones can be understood as a flow.

Fewer blood tests might reduce the physical burden and the anxiety associated with hospital visits. For doctors, it broadens the scope to notice more subtle changes.

5｜What Will Technology Restore?

I don't want to use the word "empowerment" lightly.

However, I believe that technology that reduces burdens, makes uncertainties a little more concrete, and expands choices is meaningful.

The potential of continuous hormone monitoring may not be limited to IVF.

• Hormone replacement therapy during menopause
• Hormone treatment associated with gender transition
• The context of long-term hormone management in medicine

In these areas too, understanding things as a "flow" rather than "points" should be highly significant. As small data accumulates, our understanding of medicine itself will gradually be updated.

Historically, technologies related to women's health have not received adequate investment.

Nevertheless, there are people like the developers of Impli who continue to take on challenges. In their efforts, I feel a quiet hope.

6｜Thinking in the Japanese Context

In Japan, in vitro fertilization became covered by health insurance from 2022. There are certain conditions such as age and number of attempts. Even so, the burden of hospital visits and blood tests still exists.

If continuous monitoring becomes practical, how will the operations in medical settings change?

• How will the insurance system respond?
• How will data handling be designed?
• How will communication between doctors and patients change?

It may not spread immediately. But this question is important.

That also means reviewing our fundamental approach to how we engage with our own bodies.

Seeing a teaspoonful of change as a continuous line.

We may be standing at that quiet turning point. And how we embrace that change is, I believe, up to us in the future.