Results of a multicenter study of the modified hook—titanium Greenfield filter

Numerical Analysis of the Mechanical Properties of a Vena Cava Filter

“…In other words, the model includes only dynamic friction, and there is no friction when the model does not move. However, the titanium GF has an improved hook design and does not move at the contact position (Greenfield et al, 1990(Greenfield et al, , 1991. As a preliminary test, we measured the resistance force that occurs when the head of a commercial GF is pushed and pulled in acryl and silicon rubber tubing (inner diameter: 20 mm).…”

“…2) (Ando & Kuribayashi, 2000;Boston Scientific, 2007;Greenfield et al, 1990Greenfield et al, , 1991Kinney et al, 1997;Nara et al, 1995;Rogers et al, 1998;Streiff, 2000;Swaminathan et al, 2006). This permanent filter is commonly used in Japan.…”

“…The bottom diameter of the cone is 38 mm (Greenfield et al, www.intechopen.com 1991). The total length of the GF is 47 mm (Greenfield et al, 1991). We used a head without a hole and determined the diameter (2R h ) and length (L h ) of the head by measurement.…”

“…(2) and (3). The recurved hook is set at an angle of 80 (Greenfield et al, 1991). The actual leg hook consists of a twisted and complicated structure in order to avoid migration of the filter after deployment or penetration of the vein (Greenfield et al, 1990(Greenfield et al, , 1991 (Fig.…”

“…In order to satisfy these requirements, several types of filters, such as permanent, temporary, and retrievable filters, have been proposed. For example, several types of vena cava filters, such as Greenfield filter, Vena Tech filter, Bird's nest filter, Simon-Nitinol filter, TrapEase filter, Günther tulip filter, Antheor filter, Neuhaus protect filter, and RecoveryNitinol filter, have been developed (Ando & Kuribayashi, 2000;Boston Scientific, 2007;Greenfield et al, 1990Greenfield et al, , 1991Kinney et al, 1997;Nara et al, 1995;Rogers et al, 1998;Streiff, 2000;Swaminathan et al, 2006). However, there are few quantitative data on the mechanical properties of these filters.…”