Detection of abnormalities occurring during cardioassist therapy based on vibration measurement

Abstract

Cardioassist therapy may cause centrifugal pump abnormalities. This study, purpose is to detect abnormalities that occur during cardioassist therapy. As basic study, we measured the vibration of centrifugal pump head used in external cardioassist circulation circuit based on the method used for industrial equipment diagnosis. Pump heads of two pumps were used in construction of circulation circuits. Sensor was secured to pump head, rotational frequency was set in increments of 500 rpm, and water was circulated through circuit. Vibrational quantities were analyzed, and differences between two pump heads were examined. Mean values of the displacement quantities were calculated for pump heads and different rotational frequencies. Results showed an increase in vibration with increasing rotational frequency and a difference between mean value of pump head displacement. In further studies, we will investigate possibility of quantitative recognition of abnormalities by measuring vibration in a centrifugal pump head with a simulated abnormality.