Have you considered registering your improvement as an utility innovation (UI)? A utility innovation is an exclusive right granted for a “minor” invention which does not require to satisfy the test of inventiveness as required of a patent.
An utility innovation is protected 10 + 5 + 5 years from the date of filing subject to use. It’s a relatively quick and inexpensive way to obtain protection for your new device, substance, method or process.
If you believe you have invented something new, rather than just improving an existing product you might want to consider registering a standard patent? A patent is an exclusive right granted for an invention, which is a product or a process that provides a new way of doing something, or offers a new technical solution to a problem.