The present invention provides an implantable medical product in a pouch structure, comprising an extracellular matrix (ECM) structure in sheet form. The pouch structure has an internal region and is configured to receive an electrical medical device therein. In particular, a larger pouch structure is designed to accommodate a medical device having a larger size, such as a subcutaneous implantable cardioverter-defibrillators (S-ICDs). In particular, lock-stitched seamed ECM sheets form a larger pouch structure. It is preferable that the stitches can securely hold the ECM sheets together by providing mechanical strength and durability to withstand the weight of the electronic medical device. The stitches securely hold the pouch structure together and does not fall apart during trimming or cutting of the pouch structure.
