Ontology acts as an important technique for many real world applications and this paper presents some of ontology-based approaches. This paper describes how ontology is modeled, implemented and used in healthcare domain. Ontology is an important emerging rule that has the huge potential to improve information organization, management, and understanding. The documented structure of ontology makes it a natural approach for information retrieval with relevant data. However, the construction of ontology is still time-consuming and error prone for Medical practitioners in Healthcare Domain. One recent development that aims to remedy this situation is the introduction of ontology design patterns, codifying best practices and promoting reuse. This paper presents a literature survey into the state of research on ontology patterns and how it is useful for saving patient's life.

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Data Mining Knowledge Extraction Keyword Matching Method Knowledge Theory Model.