• J A Kaufman, J W Thomas, S C Geller, S M Rivitz, and A C Waltman.
• Department of Radiology, Massachusetts General Hospital, Boston 02114, USA.
• Radiology. 1996 Jan 1; 198 (1): 71-6.

PurposeTo study guide-wire engagement and entrapment by inferior vena caval (IVC) filters.Materials And MethodsPatterns of engagement were determined in six IVC filters with four commonly used guide wires in a simulated IVC. Force required to disengage guide wires from filters was measured.ResultsEleven engagement patterns were identified with J-tipped guide wires; straight guide wires never engaged. The Simon-Nitinol filter engaged guide wires with the highest frequency (P < .05). The 15-J wire was engaged most frequently overall (P < .0005) but disengaged with forces not significantly different (P > .05) from those required to open the J. Entrapment occurred with only the Vena-Tech (VT) and 12-F stainless steel Greenfield (12SSG) filters and the 1.5-J and 3-J guide wires. The former guide wire became entrapped regardless of engagement pattern; the latter became entrapped only when engaged in the hole in the apex of the 12SSG and VT filters.ConclusionGuide wires with a J tip 3 mm or less in radius are at risk for entrapment by the 12SSG and VT filters.

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