If I had an inventors log filled out for medical device but do not have a working model is the idea still patentable/ investment worthy?

i can't disclose to much detail about my idea because it is not yet protected by any patent, i want to patent it but am afraid that with out a working model the concepts that the device operates with would be free game, the device will be able to reduce insurance costs for both the individual and companys that provide insurance to their employees. along with it's primary function it can gather statistical data and even be an online/ smartphone app. assisted device alowing multiple industries to be active in the devices functions, marketing ect. the device can also be used as a framework to develop a human operated clinic , the clinics concepts are also described and documented in the inventars notebook. not only is this concerning a medical devices conception but also a medical facility(s) that specializes in the 1 primary goal of the device , providing the same results as the device and employment to it's staff and insurance cuts to the customer of the device or facilitys service.