ABSTRACT
Objective To explore the power output and blood compatibility of a novel electromagnetic pulsatile blood pump. Methods First, a theoretical model was established to analyze the driving force of the blood pump, and the experimental driving voltage satisfying the conditions was calculated based on this model. Then, the output flow rate, output pressure characteristics and hemolysis performance of the new blood pump in vitro were preliminarily analyzed by simulated circulation experiments. Results The experimental result showed that when the pump load was 73-5 mmHg (9-78 kPa, 1 mmHg=0-133 kPa), the driving voltage was 35 V and the pulsation frequency was 75 beats/min, the flow rate of the pump was 3-18 L/min, producing high, low and average pressure of 132, 66, 98 mmHg (17-56, 8-78, 13-03 kPa), and the normalized index of haematolysis (NIH) in vitro was (0-049 15+0-003 75) mg/dL. Conclusions The new pulsatile blood pump can satisfy the clinical requirements for perfusion of isolated organs and short-term assistance of cardiopulmonary bypass, which is of great significance to the development of cardiopulmonary bypass blood pump.
ABSTRACT
A mechanical circulatory support system is a life-saving option for treating acute severe respiratory failure or cardiac failure. There are currently a few types of assist devices and the Twin-Pulse Life Support (T-PLS) system is a kind of pulsatile pump. We report here on three patients with severe life threatening cardiopulmonary dysfunction who had the T-PLS system used as an assist device. The indications for applying the T-PLS system were continuing respiratory or cardiac failure in spite of maximal ventilatory and inotropic support. There were two patients with acute respiratory failure due to infection and one patient with cardiac failure due to acute myocarditis. One respiratory failure patient and one cardiac failure patient survived after applying the T-PLS system for 3 days and 5 days, respectively. The T-PLS system is useful as an assist device and it should be considered before multi-organ failure occurs.
Subject(s)
Humans , Extracorporeal Circulation , Heart Failure , Myocarditis , Respiratory InsufficiencyABSTRACT
Objective To assess the effect of the pulsatile catheter (PUCA) pump support on cardiac resuscitation in sheep,and to provide a new approach for saving cardiac arrest patients. Methods Cardiac arrest was induced by ventricular fibrillation in 11 sheep. These sheep were divided into three groups including no support (n=3), delayed support (n=2) and immediate support (n=6). Time for cardiac resuscitation and the ratio of success to failure in each group were recorded. Hemodynamic parameters including heart rate (HR), cardiac output (CO), systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), central venous pressure(CVP),right ventricular end-diastolic pressure (RVEDP),left atrial pressure (LAP), and left ventricular end-diastolic pressure (LVEDP) were monitored and recorded at 5, 60 and 180 min after cardiac resuscitation with PUCA pump. Results Time for cardiac resuscitation in no support group, delayed support group and immediate support group was (38.3±5.8),(43.5±9.2) and (48.7±23.8)minutes, respectively(P＞0.05),and the ratio of success to failure was 0/3,0/2 and 5/1, respectively ( P＜0.05). After cardiac resuscitation with the PUCA pump support, MAP, SBP and DBP increased gradually(P＜0.05).Conclusions PUCA pump can maintain the hemodynamic stability in a sheep model of cardiac arrest,and can thus increase the success rate of cardiac resuscitation. It may be suitable for resuscitating cardiac arrest patients.