2019 Volume 46 Issue 4 Pages 382-387
In our country, a centrifugal pump is chosen by the open-heart surgery that have gave top priority to safety and biocompatibility. However, in the foreign countries, the open-heart surgery using the roller pump increases in consideration of operability and economy. The roller pump occlusion paid attention to the long-time operation causing axis displacement; Our study carried out that perfusion temperature executed the technology as a rule factor of the occlusion.
To evaluate the manifestation of the circumference of the occlusion, we used three kinds of different rollers diameter and measured perfusion temperature (Pt) and the electrical resistivity (Rz:resistance sigma), a pressure degree of the occlusion. Based on JIS-T1603, we observed the changed to kinds of the three pumps with degree of the occlusion which we were setting in the same condition as change of the occlusion by the progress at time. Pt and Rz repeated up-down motion in three pumps every 30-60 minutes. In addition, the occlusion extended the interval in progress at time. The pressure level of the sensor rose every 30 minutes and became unmeasurable afterwards.
This phenomenon affects is that perfusion temperature changes influence the blood viscosity and, we suppose that it influenced a rise in para-blood temperature and it appeared in pressure change and Rz of the occlusion. Therefore, control of the Pt leads to the appropriate control of the roller pump and thinks with an indispensable element though we carry out physiological extracorporeal.
