hl7 uk nhs implementers group integration engine stream philip firth im&t strategy...
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HL7 UK NHS Implementers GroupIntegration Engine Stream
Philip Firth
IM&T Strategy Implementation Manager
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Background
• NPfIT is stepping into gear
• Replacement of NHS IT systems will not happen overnight in Acute Hospital Trusts
• Key existing departmental systems may not even be replaced before 2010
• Systems integration is therefore a key issue for Acute Hospital Trusts
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Integration strategy
• Integration Engine on its own is not enough!
• Need Master Patient Index for validation
• Need highly skilled IT resources (R&R issues)
• Need money to invest in integration (not a given)
• Need to adhere to LSP advice and guidance
• … WWL is therefore evaluating a range of options
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Current status at WWL
• A systems integration architecture was needed to support the implementation of a web-based EPR
• WWL EPR built on an XML data repository (CSW)
• An architecture for systems integration was developed in-house using – Microsoft .NET– Microsoft SQL Server– XML technologies – XML, Schemas, XSLT, Stylesheets
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WWL Integration Architecture
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Requirements for NPfIT
• LSP advice (CSCA): – The choice of software, hardware and the
maintenance of the Trust Integration Engine is entirely the NHS Trust’s decision and responsibility.
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Required architecture
• Trust Interface Engine (TIE) – Trust IE needed to link existing systems in the
Trust to the LSP Data Centre
• Existing System Interface Engine (ESIE) – LSP IE needed to channel data from the reference
PAS to/from Trust existing systems
• Emergency Bundle Interface Engine (EBIE) – LSP IE needed to channel data from emergency
bundles to/from Trust existing systems
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Trust A Hosted and Maintained
Trust Interfacing Engine - A (TIE-A)
Existing Systems(ES)
CSC Data Centre Hosted and Maintained
Existing System InterfaceEngine(ESIE)
Emergency Bundle InterfaceEngine(EBIE)
P1R1 PAS
P1R1 Emergency Bundles
TheatresMaternity
Results A&E
1a 2a
1 2
1b 2b
LSP Existing System Architecture
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What this means for WWL
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Messaging standards
• LSP and NPfIT have agreed to base existing systems integration on HL7 v2
• NOTE: HL7v3 predominantly for NASP integration
• HL7 version 2.3 for EBIE (emergency bundles)
• HL7 version 2.4 for ESIE (reference PAS)
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Networking and Security
• Secure delivery of messages sent over the NHS/N3 network using industry standard SSL encryption
• HTTPS (Hypertext Transfer Protocol over Secure Socket Layer)
• SSL V3 encryption
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Choices of Integration Engine
• Seebeyond (aka Datagate)– Used by LSP
• Microsoft BizTalk– BizTalk 2004 well worth a look?
• Clearspan Server (aka Neon, Microscript)– A lot of Microscript interfaces in the NHS
• New kids on the block– WCI, WRQ, Intersystems ... (potentially a lucrative market)
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Options
• Buy an integration engine
• Buy in a managed service
• Entirely in-house development
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Constraints
• Money– Local funding is non-existent after 3 years CIP– LDP funding just hasn’t materialised
• Time– 101 other things to do
• Resources– Recruitment and retention is a major issue– Skills needed are in short supply (.NET, XML, SQL etc)– NHS wages cannot compete with private sector
• Local considerations– Need to maintain existing interfaces, not break them
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Way forward for WWL
• Money (lack of it …)– Favours an in-house approach
• Time– Favours a managed service approach
• Resources– Favours a managed service approach
• Local considerations– Favours an in-house approach and – Favours an integration engine approach
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Conclusion
• Balancing all options and constraints it is not easy to decide on a way forward !!!
• Lucky to have a good in-house integration architecture – this is our fall-back position
• Knowing we need to satisfy stringent LSP and NPfIT requirements we will evaluate integration engines
• Looking to HL7UK and NPfIT / Cluster wide events/forums for sharing best practice and ideas