The paper introduces an innovative security framework using Blockchain technology and deep learning in securing patient monitoring and health data transmission with IoT, for the safety of devices in smart healthcare systems. The proposed system uses Blockchain and its distributed ledger that records all transactions related to a particular asset which can guarantee integrity, transparency, and non-repudiation of IoT device data via an immutable log. To improve security, deep learning and more specifically, convolutional neural network (CNN) is used to detect anomalies within the IoT network through device behaviour and data flow patterns analysis. Our experiments on a comprehensive healthcare testbed with multiple sensors attest to the high efficacy of the current approach in differentiating between normal and adversarial behaviour. Lastly, the performance of the proposed approach is validated and compared with existing recent studies based on metrics such as attack estimation rate (AER %) and accuracy (%), The results demonstrate that the proposed approach outperforms existing studies in terms of performance.