Biocompatibility analysis of the Sundt-Kees booster clip and the Drake aneurysm clip

Technical note

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✓ A combination of the Sundt-Kees reinforcing aneurysm clip applied to a Drake aneurysm clip in a piggyback fashion was studied for possible defects due to corrosion and or tissue toxicity. These two clips, which are made of similar metal (301 stainless steel), showed little or no defects when immersed in 5% saline or when implanted in rats for 6 months. This study demonstrates that clips made of similar metals can be used piggyback in patients without ill effects provided that they are carefully handled to avoid any abrasion or misbends which could conceivably lead to corrosion.

Article Information

Address reprint requests to: Thoralf M. Sundt, Jr., M.D., Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, 55905.

© AANS, except where prohibited by US copyright law.

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Figures

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    Scanning electron micrographs of a Drake aneurysm clip that was applied to a solid silver wire and placed in a saline bath. Note that the surfaces of the contact area are literally eaten away. Left: Overall view of the two prongs. Arrows show the area in contact with the silver wire. × 8. Center: View of the right prong at the contact area. × 48. Right: View of the left prong at the contact area. × 48.

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    Scanning electron micrographs of a solid silver wire that was in contact with a Drake aneurysm clip in a saline bath. Left: Overall view of the silver wire. × 20. Right: View of the area of contact with the clip. × 80.

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    Scanning electron micrographs of a Drake aneurysm clip that was in contact with a Sundt-Kees reinforcing clip in a saline bath. The surfaces show minor abrasion and dried salts from the saline solution. Left: Overall view of the two prongs. Arrows show the area in contact with the Sundt-Kees clip. × 8. Center: View of the right prong at the contact area. × 64. Right: View of the left prong at the contact area. × 64.

  • View in gallery

    Scanning electron micrographs of a Sundt-Kees reinforcing clip that was applied to a Drake aneurysm clip and immersed in a saline bath. The surfaces in contact with the Drake clip show dried salt formations. Left: Overall view of the two cups. Arrows show contact area of cups. × 8. Center: View of the top cup contact area. × 32. Right: View of the bottom cup contact area. × 32.

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    Scanning electron micrographs of the clips after implantation in the thigh area of rats for 6 months. There is no apparent corrosion at the sites of contact. Left: View of the Sundt-Kees reinforcing clip at the cup area. × 30. Right: View of a Drake aneurysm clip blade at the area of contact with the Sundt-Kees clip (arrow). × 40.

References

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