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The Architecture of Enterprise Hospital Information System

Abstract –Because of the complexity of the hospital environment, there exist a lot of medical information systems from different vendors with incompatible structures. In order to establish an enterprise hospital information system, the integration among these heterogeneous systems must be
considered. Complete integration should cover three aspects: data integration, function integration and workflow integration. However most of the previous design of architecture did not accomplish such a complete integration.This article offers an architecture design of the enterprise hospital information system based on the concept of digital neural network system in hospital. It covers all three aspects of integration, and eventually achieves the target of one virtual data center with Enterprise Viewer for users of different roles.The initial implementation of the architecture in the 5-year Digital Hospital Project in Huzhou Central hospital of Zhejiang Province is also described.
Index Terms –Enterprise Digital Hospital System, Data Integration, Workflow Integration, Function Integration, Enterprise Viewer.

I. INTRODUCTION
Managing clinical information is a challenge with unique requirements, and so far, no system has been able to address the complexity of the entire hospital environment. Some medical information systems such as Hospital Information System (HIS), Picture Archiving and Communication System (PACS), Radiology Information System (RIS) and Laboratory Information System (LIS) are used in hospitals now, but they are usually heterogeneous and isolated. Data is incomplete, workflow is discontinuous, and management is not uniform. Therefore, it has been medical staffs’ dream to establish the Enterprise Hospital Information System that could integrate all heterogeneous systems and make all clinical data including clinical report, lab results and medical images available whenever and wherever they are needed. Many efforts have been made on integrating the heterogeneous systems in hospital. Some of them define standardised interfaces to many healthcare "Object Oriented Services" such as CORBAmed (Common Object Request Broker Architecture in Medicine) [1], which realizes the share of common functionalities like access control among
different systems. Others, like DICOM (Digital Image Communication in Medicine) [2], HL7 (Health Level Seven) [3] and the initiative of IHE (Integrating the Healthcare Enterprise) [4], specify the guidelines or standards for exchanging messages among different systems, which make the different systems working in harmony and implement the workflow integration. Due to the existence of a large variety of heterogeneous systems, three aspects of integration are required to implement an enterprise system, including data integration, workflow integration and function integration [5]. However, the above efforts have only dealt with one or two of them, which makes the integration insufficient, e.g., it’s difficult to establish one data center containing all clinical data only through message exchanging or common functionalities.To solve the problems, this article proposes an architecture design that consists of one virtual data center with Enterprise Viewer for users of different roles. This design achieves the goal of complete integration among heterogeneous systems within the hospital.

II. THE DESIGN OF ARCHITECTURE
A. Design Concept
The complicated digital hospital environment could be considered as a digital neural network system, as depicted in Fig.1.The outmost ring, analogous to neural end, contains the terminals, workstations, medical devices and even sensors in the hospital, through which all kinds of end-users could interface with the system. The end-users do not need to be aware of the internal structure of system at all.
The middle ring, assimilated to peripheral neural system, contains all kinds of the medical information systems, through which most of the tasks in a hospital are accomplished. Among them, some are departmental systems such as PACS, RIS and LIS, while others are enterprise systems such as HIS. Since most of the systems come from different vendors, they are often heterogeneous and isolated. In order to fulfill the digital workflow among these systems, a kind of framework or model is necessary to specify how to exchange messages among these systems to achieve the workflow integration.

1 comment:

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