A control unit that is configured to control delivery of radio frequency energy to a medical device, the control unit comprising: an input terminal configured to receive RF energy from an RF generator; switching circuitry configured to switch between a closed state and an open state, wherein when the switching circuitry is configured in the closed state, the switching circuitry is configured to permit a first portion of the RF energy received from an RF generator to be output by the control unit to a medical device; and wherein when the switching circuitry is configured in the open state, the switching circuitry is configured to prevent the first portion of the RF energy from being output by the control unit to the medical device; energy measurement circuitry configured to: measure an amount of the first portion of the RF energy delivered to the medical device; and switch the switching circuitry from the closed state to the open state when the amount of the first portion of the RF energy delivered to the medical device reaches a predetermined RF energy level; characterized by a power supply circuitry configured to: receive a second portion of the RF energy received from the RF generator via a connection; generate one or more power supplies (217, 219) based on the second portion of the RF energy; and supply the one or more power supplies to the energy measurement circuitry to power the energy measurement circuitry. an input terminal configured to receive RF energy from an RF generator; switching circuitry configured to switch between a closed state and an open state, wherein when the switching circuitry is configured in the closed state, the switching circuitry is configured to permit a first portion of the RF energy received from an RF generator to be output by the control unit to a medical device; and wherein when the switching circuitry is configured in the open state, the switching circuitry is configured to prevent the first portion of the RF energy from being output by the control unit to the medical device; wherein when the switching circuitry is configured in the closed state, the switching circuitry is configured to permit a first portion of the RF energy received from an RF generator to be output by the control unit to a medical device; and wherein when the switching circuitry is configured in the open state, the switching circuitry is configured to prevent the first portion of the RF energy from being output by the control unit to the medical device; energy measurement circuitry configured to: measure an amount of the first portion of the RF energy delivered to the medical device; and switch the switching circuitry from the closed state to the open state when the amount of the first portion of the RF energy delivered to the medical device reaches a predetermined RF energy level; characterized by measure an amount of the first portion of the RF energy delivered to the medical device; and switch the switching circuitry from the closed state to the open state when the amount of the first portion of the RF energy delivered to the medical device reaches a predetermined RF energy level; characterized by a power supply circuitry configured to: receive a second portion of the RF energy received from the RF generator via a connection; generate one or more power supplies (217, 219) based on the second portion of the RF energy; and supply the one or more power supplies to the energy measurement circuitry to power the energy measurement circuitry. receive a second portion of the RF energy received from the RF generator via a connection; generate one or more power supplies (217, 219) based on the second portion of the RF energy; and supply the one or more power supplies to the energy measurement circuitry to power the energy measurement circuitry.