2.My major is Biomedical Engineering which focus on My major is Biomedical Engineering which focuses on medical equipment research and development.
Note:
1. The sentence "reaserch and develop medcial devices" has grammatical errors ( The phrase "development" is grammatically incorrect (development) and misspelled (reaserch and medcial) and should read "research and develop medical devices".
2. "Medical equipment" should be translated as "medical equipment".
References:
3. The first sentence is translated in the order you provided and can be used. The second sentence is more authentic English.