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En kompakt testplattform för felsökning och utveckling av portabelt EKG: Användning av Raspberry Pi för att karaktärisera överföringsfunktionen samt undersökning av WCT
Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems.
Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems.
2021 (Swedish)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesisAlternative title
A compact testplatform for troubleshooting and development of a portable ECG : Using a Raspberry Pi to characterize the transfer function and investigation of WCT (English)
Abstract [sv]

Projektet tar sin start i den intressanta fasen testning och verifiering. En prototyp har påbörjats för ett portabelt EKG tillsammans med Linköpings universitet och ett tidigare examensarbete. Prototypens elektriska egenskaper behöver nu genomgå test och verifiering. Samt undersöka om kretskortet kan ha blivit fel designat. Målsättningen för produkten är att den ska kunna krympa avståndet mellan mätpunkterna i förhållande till ett 12 avlednings-EKG. En problematik för arbetet är att undersöka vilka alternativa placeringar eller konfigurationer av Wilson Central Terminal som kan göras på enbart överkroppen.

En testplattform grundad på enkortsdatorn Raspberry Pi utformades för att säkerställning av systemets funktionalitet kunde utföras med en känd signal. Efter säkerställningen gjordes tester med elektroder på person.

Testplattformen fungerade väl och kunde ge en bra bild över produktens kapacitet och begränsningar. Kretskortet är felkopplat i någon mening samt att systemet begränsar frekvensomfånget så att inte alla nödvändiga frekvenser upptas för en korrekt återspegling av hjärtats aktivitet.

Produkten fungerar bra men har en del funktioner kvar att implementera innan den kan tas i allmänt bruk. Att dubbla bandbredden för frekvenser skulle innebära att hjärtfel inom de området skulle upptäckas av systemet. En av elektroderna har anslutits till fel kanalingång på A/D-omvandlaren för att helt kunna kopiera och komprimera en normal mätning av EKG.

Abstract [en]

The project takes it start at the interesting phase testing and verification. A prototype has been started for developing of a portable ECG in cooperation between Linköpings university and an earlier bachelor thesis. The prototypes electrical properties need to be tested and verified. The PCB also needs an examination to see if it has been incorrectly designed. The objective for this product is to minimize the distance between the measuring points relative to a 12-lead ECG. A challenging task is to examine what alternative placements or configurations there is of Wilson Central Terminal which can only be done on the upper body.

A test platform based on the single card computer Raspberry PI has been developed to ensure the systems functionality by sending a known signal into the system. Next phase after the verification was to undergo and investigate the system behavior when the electrodes is placed on a test person.

The test platform worked well and was able to put light on both the abilities and constraints. It turned out that in some meaning the PCB is not optimally designed. The total bandwidth for the system is limited and cannot fully represent all frequencies that is needed to cover extreme cases and give an exact health check on the heart.

The instrument is now able to pick up the electric activities with aid from the loose electrodes, that also has been used under the verification. There still is a small amount of noise left on the signal. Before the instrument can be launched to commercial use there remain a few functions to implement. One thing is to double the bandwidth, it should solve the difficulty to detect the higher frequency. It is not necessary, but to completely shrink and copy the original pattern from a larger EKG-measurement the PCB design must be remade. The results from the new pattern appear to be good enough but must be verified from medical view.

Place, publisher, year, edition, pages
2021. , p. 51
Keywords [sv]
elektronik, WCT, EKG, portabel, Raspberry Pi, elektrokardiografi, ADS1298, signalgenerator
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-176927ISRN: LiTH-ISY-EX-ET--21/0504--SEOAI: oai:DiVA.org:liu-176927DiVA, id: diva2:1570265
Subject / course
Integrated Circuits and Systems
Presentation
2021-06-17, 08:30 (Swedish)
Supervisors
Examiners
Available from: 2021-06-22 Created: 2021-06-21 Last updated: 2021-06-22Bibliographically approved

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