Heart Booster: a pericardial support device

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Presentation transcript:

Heart Booster: a pericardial support device Robert T.V Kung, PhD, Meir Rosenberg The Annals of Thoracic Surgery Volume 68, Issue 2, Pages 764-767 (August 1999) DOI: 10.1016/S0003-4975(99)00524-X

Fig 1 Cross-sectional view of the device wrapped into a circle with the diastolic and systolic shape shown concentrically. The shaded region is the change in area (“volume”) resulting from inflating the attached tubes from nearly flat (highly elliptical shape) to circular shape. It is evident that the stroke volume (shaded region) is larger than the volume represented by the sum of the circular tubes. The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)

Fig 2 Illustrates the device wrapped around a heart. A hydraulic pump is shown as a driver for fluid introduction and withdrawal. A fluid reservoir is used for compliance. The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)

Fig 3 The small actuation volume needed from this device is illustrated by the volume ratio, VB/VH (physiologic to hydraulic), as a function of the number of tubes forming the wrap’s perimeter. Calculated ratio is given for a univentricular support with a left heart wrap and a ventricular support with a complete wrap. The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)

Fig 4 Shape of the unfurled device. The device is illustrated in two sections, usable as either a univentricular or a biventricular support device. Fluid introduction is through the open apical ends (two of which are illustrated). The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)

Fig 5 (A) Pressure and (B) flow generated by a wrap as a function of drive pressure respectively for a flow of 6.5 L/min and an afterload of 115 mm Hg. A partial wrap in the left ventricular support configuration is used in these measurements. Calculation is shown as a solid curve. The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)

Fig 6 (A) Oxygen saturation and (B) mean aortic pressure in a hypoxia failure model in a transition from “no assist” to “assist” and returning to “no assist” condition. The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)

Fig 7 Hemodynamic transition from device off to device on. Parameters shown are PAP = pulmonary artery pressure; AOP = aortic pressure; DAF = descending aortic flow; and PAF = pulmonary artery flow. The Annals of Thoracic Surgery 1999 68, 764-767DOI: (10.1016/S0003-4975(99)00524-X)