How to choose international mountain insurance, mostly for Europe?

There's a saying 'Better safe then sorry', and unfortunately, I was too lazy to follow that rule in the future.

I live in Central Europe, which gives me an opportunity for quick, few-days trips to many surrounding countries, such as Poland, Slovakia, Germany, Switzerland etc. As an EU-citizen I can expect free medical services in all EU countries, however rescue is not included, for example in Slovakia.

I've heard from some people met in mountains they've got some insurance valid in mountains in many countries, which should include medical and rescue services, however, I haven't noticed the name of that insurances.

Is there any general insurance policy, good for people, who travel to mountains many times a year, in many regions? It's probably cheapest to buy policy for a given trip, but if there are many short trips, it's simply eating too much time.

Are the travel policies included in credit cards any use in such cases?