A collection of sterile, invasive, non-steerable devices intended to provide percutaneous sub-xiphoid access to enable introduction of a diagnostic catheter (not included) to the epicardial surface of the heart. It primarily includes: 1) a percutaneous introducer sleeve/tunneller with obturator, intended for initial introduction; 2) a retracting mechanism, intended to grab and separate the pericardium from the epicardial surface; 3) a needle, intended to puncture the pericardium; and 4) a haemostatic valve. This is a single-use device.