Generator for the delivery of high frequency alternating current to a medical instrument

A generator configured to delivery high frequency (HF) alternating current to a medical instrument, the generator comprising:

• a power supply unit;
• an HF generator primary unit;
• an application unit;
• at least one relay that is configured to switchably, electrically connect the application unit to at least one terminal of the medical instrument;
• a control unit configured to control the application unit and the at least one relay;
• and
• an intermediate control unit configured to receive control signals from the control unit, process the control signals and transmit the control signals, after processing, to the application unit, wherein:
• the power supply unit is configured to supply power to the HF generator primary unit and the control unit;
• the HF generator primary unit is connected to, but galvanically separated from, the power supply unit and the application unit and is configured to supply the application unit with HF alternating current during operation of the generator;
• the control unit is configured to control the at least one relay and the application unit via the intermediate control unit;
• the control unit is galvanically separated from the intermediate control unit by a first galvanic separation and the intermediate control unit is galvanically separated from the application unit by a second galvanic separation such that the first galvanic separation and the second galvanic separation are two serial galvanic separations in a control circuit from the control unit to the application unit, the first galvanic separation being before an entry of the intermediate control unit and the second galvanic separation being at an outlet of the intermediate control unit;
• the intermediate control unit is configured to control a read-back contact of the at least one relay;
• the intermediate control circuit is configured to receive, during the operation of the generator, the control signals from the control unit and to generate relay control signals in dependence on the control signals and to output the relay control signals to the at least one relay;
• the intermediate control circuit is connected to the control unit via at least one optocoupler;
• the at least one optocoupler is configured to transmit the control signals from the control unit to the intermediate control circuit;
• the intermediate control circuit has a relay control unit that is configured to process the control signals received from the control unit and to generate the relay control signals in dependence on the control signals;
• and
• a number of optocouplers of the at least one optocoupler between the control unit and the intermediate control circuit is smaller than a number of relays of the at least one relay.

A generator configured to deliver high frequency (HF) alternating current to a medical instrument, the generator comprising:

• a power supply unit;
• an HF generator primary unit;
• an application unit;
• at least one relay that is configured to switchably, electrically connect the application unit to at least one terminal of the medical instrument;
• a control unit configured to control the application unit and the at least one relay;
• and
• an intermediate control unit configured to receive control signals from the control unit, process the control signals and transmit the control signals, after processing, to the application unit, wherein:
• the power supply unit is configured to supply power to the HF generator primary unit and the control unit;
• the HF generator primary unit is connected to, but galvanically separated from, the power supply unit and the application unit and is configured to supply the application unit with HF alternating current during operation of the generator;
• the control unit is configured to control the at least one relay and the application unit via the intermediate control unit;
• the control unit is galvanically separated from the intermediate control unit by a first galvanic separation and the intermediate control unit is galvanically separated from the application unit by a second galvanic separation such that the first galvanic separation and the second galvanic separation are two serial galvanic separations in a control circuit from the control unit to the application unit, the first galvanic separation being before an entry of the intermediate control unit and the second galvanic separation being at an outlet of the intermediate control unit;
• the control unit, the intermediate control unit and the application unit are configured such that the control signals from the control unit for controlling the application unit are transmitted over the first galvanic separation from the control unit to the intermediate control unit and from the intermediate control unit over the second galvanic separation to the application unit;
• the application unit has a high frequency generator circuit that is connected to the HF generator primary unit and configured to supply a connected medical instrument with high frequency high voltage during operation;
• the high frequency generator circuit is electrically connected in a switchable manner to the at least one terminal for connecting the connected medical instrument via the at least one relay;
• the intermediate control unit is configured to control the at least one relay and read the output of the at least one relay;
• and
• the at least one relay is a separate component from the intermediate control unit.