A device system comprising: a reusable connector cable (22; 58; 158) operably connectable to a signal processing module, the connector cable (22; 58; 158) including a first adaptor (44; 60; 160) and a first fiber optic cable disposed within the reusable connector cable (22; 58; 158); a single use device (14; 62) capable of connecting to the reusable connector cable (22; 58; 158), the single use device (14; 62) including a second adaptor (46; 64) capable of mating with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158) and a second fiber optic cable extending through the single use device (14; 62) such that the second fiber optic cable optically connects to the first fiber optic cable when the second adaptor (46; 64) of the single use device (14; 62) is mated with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158); and a cleaning assembly (78; 88) disposed within the single use device (14; 62) and configured such that mating the second adaptor (46; 64) of the single use device (14; 62) with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158) causes the cleaning assembly (78; 88) to clean an end of the first fiber optic cable, the device system being characerised in that it is a medical device system and in that the second adaptor (46; 64) includes a pocket to accommodate the cleaning assembly (78; 88) when the cleaning assembly (78; 88) is moved into a collapsed configuration when the second adaptor (46; 64) of the single use device (14; 62) mates with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158). a reusable connector cable (22; 58; 158) operably connectable to a signal processing module, the connector cable (22; 58; 158) including a first adaptor (44; 60; 160) and a first fiber optic cable disposed within the reusable connector cable (22; 58; 158); a single use device (14; 62) capable of connecting to the reusable connector cable (22; 58; 158), the single use device (14; 62) including a second adaptor (46; 64) capable of mating with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158) and a second fiber optic cable extending through the single use device (14; 62) such that the second fiber optic cable optically connects to the first fiber optic cable when the second adaptor (46; 64) of the single use device (14; 62) is mated with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158); and a cleaning assembly (78; 88) disposed within the single use device (14; 62) and configured such that mating the second adaptor (46; 64) of the single use device (14; 62) with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158) causes the cleaning assembly (78; 88) to clean an end of the first fiber optic cable, the device system being characerised in that it is a medical device system and in that the second adaptor (46; 64) includes a pocket to accommodate the cleaning assembly (78; 88) when the cleaning assembly (78; 88) is moved into a collapsed configuration when the second adaptor (46; 64) of the single use device (14; 62) mates with the first adaptor (44; 60; 160) of the reusable connector cable (22; 58; 158).