Gregory G. Couch, MASc, K.Wayne Johnston, MD, FRCS, Matadial Ojha, PhD

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Presentation transcript:

An in vitro comparison of the hemodynamics of two inferior vena cava filters Gregory G. Couch, MASc, K.Wayne Johnston, MD, FRCS, Matadial Ojha, PhD Journal of Vascular Surgery Volume 31, Issue 3, Pages 539-549 (March 2000) DOI: 10.1067/mva.2000.103799 Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 1 The photochromic flow visualization and measurement system. CCD, Charge-coupled device. Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 2 Flow phantom and insertion of A, the 12F Titanium Greenfield filter, and B, the VenaTech LGM filter Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 3 Direction of the scan with the photochromic system, and the field of view of the charge-coupled device camera. Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 4 Spatial orientation and numbering convention used to identify the four scans within the flow phantom. Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 5 Displacement profiles (blue ) recorded in the 12F Greenfield (left ) and VenaTech LGM filters (right ) A, with a flash delay of 0 ms, B, with a flash delay of 20 ms, and C, superimposed with theoretical velocity profiles (red ) for flow in the absence of the filter for comparison. Each profile represents the average of 10 measurements. Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 6 Wall shear stress distributions measured in A, the horizontal and B, the vertical cross-sectional planes of the 12F Titanium Greenfield filter, and in C, the horizontal and D, the vertical cross-sectional planes of the VenaTech LGM filter. For comparison, the theoretical wall shear stress in the absence of the filter is shown. Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 7 Regions of fluid with velocity less than the theoretically predicted value in the absence of a filter are shown in red for the A, horizontal and C, vertical cross-sectional planes of the 12F Titanium Greenfield filter, and the B, horizontal and D, vertical cross-sectional planes of the VenaTech LGM filter. Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions

Fig. 8 Sketch of streamlines showing the relative effects of flow past A, a round filter “leg” and B, a flat filter “leg.” Journal of Vascular Surgery 2000 31, 539-549DOI: (10.1067/mva.2000.103799) Copyright © 2000 Society for Vascular Surgery and International Society for Cardiovascular Surgery, North American Chapter Terms and Conditions