An optical head for reading an object includes a hollow housing, a light source module, a diffuser structure and a light sensing module. In the switching system for controlling conduction between electrodes of a switch by discharge between the electrodes, a laser beam is applied to one of the electrodes to make discharge from the other of the electrodes be induced by the laser beam and application of the laser beam is controlled to switch the conduction. The proximal end of the first tube is configured to receive pressurized ionizable gas. The tissue specimen is suitable for implantation as a homograft or xenograft, with or without rehydration.