This paper presents an Incremental Class Semantic Segmentation (CISS) method for accurate, real-time scene understanding in robotic surgical environments. To overcome the limitations of existing segmentation models trained on static datasets, we propose TOPICS+, an improved version of the Taxonomy-Oriented Poincaré-regularized Incremental Class Segmentation (TOPICS) method. TOPICS+ addresses class imbalance by adding the Dice loss to the hierarchical loss function, introduces hierarchical pseudo-labeling, and designs a label classification scheme tailored to robotic surgical environments. Furthermore, we present six new CISS benchmarks to mimic the class incremental settings of realistic robotic surgical environments and provide an improved label set of over 144 classes on the Syn-Mediverse synthetic dataset. The code and trained models are publicly available.