Patent problem: I designed a product similar to the existing patent, with basically the same principle, but different structure. Can I also apply for a patent? thank you

A utility model or invention must have three characteristics of novelty, creativity and practicality, especially novelty. That is to say, the premise of applying for a patent can be simply understood as the word "new", which brings better effect on the basis of "new", is suitable for use and meets "practicality".

Your design structure is different from the existing patented technology. First of all, it has met the requirements of novelty. And what about the so-called creativity? Personally, I always think this is subjective. Even the same working principle, because of the structural change, cost reduction, performance improvement, easier processing, convenient maintenance and so on, can be regarded as the direct benefits brought by this new technical scheme. A technical scheme that can satisfy novelty and creativity can almost be considered practical as long as it can be realized.

According to my thinking, I can basically apply.

However, it should be noted that the same principle is only a structural change. Please pay attention to distinguish whether the two structures belong to the same transformation in technical common sense, if so, it may lead to lack of creativity.