In general, python libraries that access native libraries (.DLL, .so) will not (ever) work in jython. However, it is often possible to find java bindings for such native libraries, which can be used in jython. One would use the java examples for such bindings instead of the python examples.
There is a SourceForge project call jvisa that appears to offer what you need if you pursue this approach. If your jython is only going to run in the gateway, you could simply add the files to your gateway’s lib folder with all of the other common jars. Otherwise, you’ll need to package jvisa into a module so its parts get distributed properly to each client.