Surgery – Instruments – Internal pressure applicator
Patent
1989-09-07
1991-10-22
Rosenbaum, C. Fred
Surgery
Instruments
Internal pressure applicator
210448, A61B 1700
Patent
active
050592050
ABSTRACT:
A filter device positionable within a blood vessel for trapping blood clots in that vessel, the filter device comprising a head with a plurality of divergent legs each secured at its proximal end, to the head, each leg having a hook arranged at its distal end. The distal end includes a reversely bent portion of the leg which itself is bent radially outwardly, ending in the shape of a sharp point. The reversely bent portion of the leg comprises a pad to minimize the depth of penetration of the hook.
A further embodiment of the leg shows a radially outwardly directed radius of curvature to create a conical configuration to the filter assembly, while distributing the stress concentration along the length of the bend, so that the elastic limit of the material, stainless steel in this embodiment, is not exceeded, and which permits compact delivery of the filter, and adequate radially directed force to permit slight hook penetration of a vessel wall.
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Journal of Vascular Surgery, Jul. 1987, Experimental Comparison of Percutaneous Vena Caval Devices, Titanium Greenfield Filter Versus Bird's Nest Filter.
AJR: 151 Nov. 1988, Gunther Vena Caval Filter, Results of Long Term Follow-Up.
Interventional Radiology, Copyright 1988, Chapter 22, Inferior Vena Cava Filters.
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El-Nounou Fozan O.
Kordis Thomas F.
Sahatjian Ronald A.
Savin Michael A.
Weinreich Michael
Boston Scientific Corporation
Halgren Donald N.
Lewis William W.
Rosenbaum C. Fred
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