The concept is the proposirions on HW-SW implementation of probability system for diagnostics with its Knowledge base distributed between Mobile Diagnostics Devices (MDD) and cloud structures. Due to the progress of the System on Chip technology the Knowledge base will migrate towards the MDDs. The decentralized approach is proposed. It provides high level of security for personal data, low cost of system set up and maintenance. Each user has a portable MDD which collects information from biosensors attached to the user's body, stores this information and has a SW for diagnostic of diseases. The diagnostic algorithms are open, the MDD SW is easily updated implementing the updates of the algorithms. USB, BT and ZigBee interfaces are incorporated into the MDD. Recommended by Continua Alliance the IEEE 11073-104xx protocols are implemented for communication of the MDD with sensors. User interface gives possibility for manual input of measurement data. The interface is designed for elderly persons, people with chronic diseases, disabled people. The results of diagnostic is displayed on the MDD screen. The Diagnostic Software Applications (DSA) located in the cloud structures may be communicated over HL7 v3 protocol. Information from MDD data bases (DB) may be transmitted to DSA, an access to the information from MDD DB to DSA may be authorized. It's planned to certify the MDD in Continua Alliance. Manufacturing and maintenance of the MDD are planned to be performed on the Russian factory. The maintenance includes implementation of new versions of SW in all MDDs in operation. The sensors available today on the market don't cover the needs for diagnostic of diseases listed in the Regulations on the MDD selection. Development of flexible biosensor network is planned. One of the members of the team develops and manufactures sensors. An estimation of the market of MDD in Saint-Petersburg today is 200 000 pieces.