This document proposes a new mechanism called ANKM to transmit urgent data in wireless sensor networks. It discusses existing transport layer protocols that provide reliability but do not prioritize urgent data transmission. The ANKM mechanism uses an assured path to transmit urgent data with reliability while blocking normal data packets. It operates in three phases - selecting an assured path, transmitting urgent data along that path using reliability mechanisms, and then resuming normal network operations. The goal is to transmit urgent data with reliability and congestion control while still allowing normal data to flow when the urgent transmission is not occurring.