Don't dissolving stitches already exist[0]?

> Absorbable sutures, also known as dissolvable stitches, are sutures that can naturally dissolve and be absorbed by the body as a wound heals.

[0]: https://www.webmd.com/a-to-z-guides/what-to-know-absorbable-...

Yes. Now imagine e.g. dissolving pace makers or whatnot.

I wonder what use that would have—maybe healing after heart surgery? Using a pacemaker as a crutch until your heart can beat on its own again?

a pacemaker is admittedly a poor example, but it's also just that: an example. I'm sure there's hosts of medical devices that would benefit from dissolving. Perhaps even devices that are infeasible currently because they don't dissolve.