A system for coupling electrical signals between an interventional device and a control unit through an electrically insulating barrier , the system comprising: a connector , comprising a device connector portion and a control unit connector portion (140"); wherein the device connector portion is configured to be electrically coupled to a proximal portion of the interventional device ; wherein the control unit connector portion (140") is configured to be electrically coupled to the control unit ; wherein the device connector portion , and the control unit connector portion (140") are configured to couple to each other across the electrically insulating barrier ; wherein the device connector portion comprises at least one transmitter , configured to transmit electrical signals representing i) transducer signals and ii) synchronisation signals for the transducer signals, the transducer signals being generated at a distal portion (110") of the interventional device , and the synchronisation signals being generated at a distal portion (110") of the interventional device or in the device connector portion ; wherein the control unit connector portion (140") comprises at least one receiver configured to receive the electrical signals when the control unit connector portion (140") and the device connector portion are coupled to each other across the electrically insulating barrier ; and wherein the control unit connector portion (140") or the control unit , is configured to extract the transducer signals and the synchronisation signals from the electrical signals, and to perform a timing correction on the transducer signals based on the synchronisation signals. a connector , comprising a device connector portion and a control unit connector portion (140"); wherein the device connector portion is configured to be electrically coupled to a proximal portion of the interventional device ; wherein the control unit connector portion (140") is configured to be electrically coupled to the control unit ; wherein the device connector portion , and the control unit connector portion (140") are configured to couple to each other across the electrically insulating barrier ; wherein the device connector portion comprises at least one transmitter , configured to transmit electrical signals representing i) transducer signals and ii) synchronisation signals for the transducer signals, the transducer signals being generated at a distal portion (110") of the interventional device , and the synchronisation signals being generated at a distal portion (110") of the interventional device or in the device connector portion ; wherein the control unit connector portion (140") comprises at least one receiver configured to receive the electrical signals when the control unit connector portion (140") and the device connector portion are coupled to each other across the electrically insulating barrier ; and wherein the control unit connector portion (140") or the control unit , is configured to extract the transducer signals and the synchronisation signals from the electrical signals, and to perform a timing correction on the transducer signals based on the synchronisation signals. <EOS>