A release mechanism for releasing a medical device, the release mechanism comprising: a generally elongate shaft defining a longitudinal axis; an actuating member receivable in the elongate shaft, the actuating member having an interlocking position and a releasing position; and at least two, mutually opposed arms (20, 30) at a distal end of the elongate shaft, the arms being biased to open relative to each other, each arm comprising: a gripping portion (42, 43) at a distal end thereof, and at least one interlocking member (23, 33), wherein: the gripping portions (42, 43) of the arms at least partially define a hollow space for holding a medical device to be released, the interlocking member (23, 33) of each arm is longitudinally spaced from the interlocking member of any other arm, each interlocking member (23, 33) extends circumferentially around a sufficient proportion of the actuating member such that, when the actuating member is in the interlocking position, opening of the arms (20, 30) is prevented by interaction between the actuating member and the interlocking members, and the actuating member is longitudinally retractable from the interlocking position to the releasing position to enable the arms (20, 30) to open for releasing a medical device from the gripping portions (42, 43). a generally elongate shaft defining a longitudinal axis; an actuating member receivable in the elongate shaft, the actuating member having an interlocking position and a releasing position; and at least two, mutually opposed arms (20, 30) at a distal end of the elongate shaft, the arms being biased to open relative to each other, each arm comprising: a gripping portion (42, 43) at a distal end thereof, and at least one interlocking member (23, 33), wherein: the gripping portions (42, 43) of the arms at least partially define a hollow space for holding a medical device to be released, the interlocking member (23, 33) of each arm is longitudinally spaced from the interlocking member of any other arm, each interlocking member (23, 33) extends circumferentially around a sufficient proportion of the actuating member such that, when the actuating member is in the interlocking position, opening of the arms (20, 30) is prevented by interaction between the actuating member and the interlocking members, and the actuating member is longitudinally retractable from the interlocking position to the releasing position to enable the arms (20, 30) to open for releasing a medical device from the gripping portions (42, 43). a gripping portion (42, 43) at a distal end thereof, and at least one interlocking member (23, 33), wherein: the gripping portions (42, 43) of the arms at least partially define a hollow space for holding a medical device to be released, the interlocking member (23, 33) of each arm is longitudinally spaced from the interlocking member of any other arm, each interlocking member (23, 33) extends circumferentially around a sufficient proportion of the actuating member such that, when the actuating member is in the interlocking position, opening of the arms (20, 30) is prevented by interaction between the actuating member and the interlocking members, and the actuating member is longitudinally retractable from the interlocking position to the releasing position to enable the arms (20, 30) to open for releasing a medical device from the gripping portions (42, 43). the gripping portions (42, 43) of the arms at least partially define a hollow space for holding a medical device to be released, the interlocking member (23, 33) of each arm is longitudinally spaced from the interlocking member of any other arm, each interlocking member (23, 33) extends circumferentially around a sufficient proportion of the actuating member such that, when the actuating member is in the interlocking position, opening of the arms (20, 30) is prevented by interaction between the actuating member and the interlocking members, and the actuating member is longitudinally retractable from the interlocking position to the releasing position to enable the arms (20, 30) to open for releasing a medical device from the gripping portions (42, 43).