Implantable Pressure Sensor Encapsulation for Ventricular Assist Device Control

Lingua: inglese

Editore: Hartung-Gorre, Hartung-Gorre Dez 2024, 2024

3866288344 / 9783866288348

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This item is printed on demand - Print on Demand Titel. Neuware -Autonomous feedback controlled ventricular assists device (VAD) operation promises a plethora of benefits such as increased patient safety, comfort, and reduced healthcare costs. Current generation VADs operate at static pump speeds due to the lack of available biocompatible, long-term stable pressure sensor systems.In this thesis, a pressure sensor encapsulation was developed and integrated in an inflow cannula for a VAD and in an implantable testing platform for animal trials. The encapsulation uses a media separating diaphragm embedded in a Parylene C coating. The approach is expanded to enable optimized diaphragm shapes, which allow significantly better control over the final device characteristics, especially the temperature cross sensitivity.Furthermore, a production processes was developed to minimize assembly induced internal overpressure.The produced capsules showed excellent pressure transmission of more than 99.7 % and a temperature cross sensitivity of less than 266 Pa from 35 °C to 42 °C for most capsules. However, a large temperature cross sensitivity was observed from room to body temperature in some capsules, adding relevant drift of 750 Pa (75 % quartile) after 42 days to the measurement.The observed drift is related to the viscoelastic nature of the Parylene C diaphragm and the capsule-to-capsule variation is attributed to production process variations, which can be further optimized.Systematic errors in the pressure transmission, temperature cross sensitivity (TCS), and drift were extracted and correction approaches for each were developed. This enabled the reduction of the pressure transmission error by 50 % by linear correction. A differential measurement approach reduced the temperature cross sensitivity to less than 70 Pa from 35 °C to 42 °C and drastically reduced the temperature induced drift to 300 Pa (75 % quartile) after a jump from room to body temperature. Half of all sensors even remained within a +- 100 Pa window in the same time period.Books on Demand GmbH, Überseering 33, 22297 Hamburg 192 pp. Englisch.…

Codice articolo 9783866288348

Titolo
Implantable Pressure Sensor Encapsulation for Ventricular Assist Device Control
Autore
Matthias Alexander Dupuch
Editore
Hartung-Gorre, Hartung-Gorre Dez 2024
Anno di pubblicazione
2024
Condizione
Neu
Rilegatura
Taschenbuch
Lingua
inglese
ISBN 10
3866288344
ISBN 13
9783866288348
Peso dell'articolo
376 grammi
Dimensioni
240x170x13 mm

buchversandmimpf2000

Emtmannsberg, BAYE, Germania

Venditore con 5 stelle

Venditore AbeBooks dal 23 gennaio 2017

Tariffe di spedizione da Germania a U.S.A.

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