A medical device control unit may include at least one processing device, a circuit electrically coupled to the at least one processing device, and a flexible housing configured to contain the at least one processing device and the circuit. The flexible housing may include at least one connection portion configured to engage a connector protruding from a flexible carrier, and at least one electrical contact electrically coupled to the circuit and configured to establish an electrical connection with an exposed electrical contact on the flexible carrier when the connection portion is engaged with the at least one connection portion.