1. Innovation: An invention applying for a patent must be innovative, that is, its technical scheme does not belong to the known technical scheme in the same technical field. If this needle drill has the same technical scheme in the known technical field, then you can't apply for a patent.
2. Practicality: The invention for which a patent is applied must be practical, that is, its technical scheme can be applied in actual production or life. If this needle drill has no practical value, then you can't apply for a patent.
3. Feasibility: The invention for which a patent is applied must be feasible, that is, its technical scheme can be realized under the existing technical conditions. If the technical scheme of this needle electric drill can't be realized, then you can't apply for a patent.