yapay kalp destek ünitesinin kan viskozitesi ölçümünü gerçekleştiren titreşimli bir viskozimetre olarak geliştirilmesi

Ali AKPEK
79 13

Öz


Bir hastada yapay kalp destek üniteleri kullanıldığında, kırmızı kan hücreleri zaman içerisinde ünitelerin iç yapılarına tutunmakta ve tromboz oluşmasına neden olmaktadır. Böylelikle birkaç yıl içerisinde yapay kalp destek üniteleri ciddi hasarlar almakta ve kullanılması imkansız hale gelmektedir. Bu çalışmanın amacı yapay kalp destek ünitesinde bulunan kanın viskozitesini tespit etmek ve uzmanlara kalp ünitesinin durumu hakkında bilgi temin etmektir. Trombo z kalp destek ünitesinde birikmeye başladığı zaman kalp destek ünitesi üzerinden akan kanın viskozitesi de artmaktadır. Böylelikle kalp destek ünitesinde oluşan tromboz hakkında fikir elde edilmesi amaçlanmıştır. Bunu gerçekleştirebilmek adına kalp pompası içerisindeki rotor sadece kendi ekseni etrafında döndürülmemiş, bunun yanında belirlenmiş bir frekansta da osilasyona maruz bırakılmıştır. Çalışma esnasında anlaşılmıştır ki kalp destek ünitesi içindeki viskozite arttıkça, rotoru aynı frekansta osilasyona tabi tutmakta zorlaşmaktadır. Viskozite arttıkça belirlenmiş olan bu frekansta faz kaymaları oluşmaktadır. Nihayetinde kanın viskozitesi ile kalp destek ünitesinin rotorunda oluşan faz kayması arasında doğrusal bir ilişkinin olduğu anlaşılmıştır.

Anahtar kelimeler


Viskozimetre; viskozite; trombojenez; yapay kalp destek ünitesi

Tam metin:

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