Interrelationship of aneurysm clips and vascular tissue

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✓ Various straight-jawed aneurysm clips were tested for occluding capabilities on a vascular tissue model. Occluding pressures varied markedly among the clip styles and were altered by changes in the lumen and tissue composition of the model. Mechanical characteristics are highly variable between clip styles, but fall within a narrow range for clips of a similar style. The complex interplay of the unique aspects of clip design and force generated by the spring in conjunction with tissue characteristics and precise clip placement upon the tissue are major variables in the apparent ability of a particular clip to occlude the neck of an aneurysm.

Article Information

Address reprint requests to: Thoralf M. Sundt, Jr., M.D., Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota 55901.

© AANS, except where prohibited by US copyright law.

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Figures

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    T-tube system to determine opening pressure of various aneurysm clips on a vascular tissue model.

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    The mean and standard deviation of the opening pressure of various aneurysm clips on vascular tissue models.

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    The median, high, and low values for opening pressure of various aneurysm clips on a vascular tissue model with simulated wall irregularity.

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    Static model. The mean and standard deviation (gm) required to open various aneurysm clips 3 mm with the force applied 2 mm from the distal blade tips.

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    Static model. The mean and standard deviation (gm) necessary to cause aneurysm clip slippage when each clip was placed 6 mm onto a cardboard sheet 3 mm thick. (Note that the Heifetz clip value is an estimate, see text).

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