Medical device delivery system having reduced loading, and method
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United States of America Patent
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Issued Date -
Jan 23, 2003
app pub date -
Jul 23, 2001
filing date -
Jul 23, 2001
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Abstract
The present invention involves medical devices, and also the delivery systems used to convey them to a desired location for treatment and then deploy them in position. Of course, it is desirable for many reasons to reduce the amount of stress or loading in the compressed medical device. Less stress generally means the device is more flexible during delivery, less friction during deployment, less possibility of device failure. Also, less stress may indicate the delivery system can obtain a longer shelf life, needs to support less expansive force, and can be designed with greater flexibility and smaller dimensions to reach smaller and more delicate anatomy. The novel technique of the present invention includes intentionally 'over-compressing' the stent or other medical device to a size slightly smaller than eventually desired, using much greater pressure, and then 'relaxing' the stent by allowing it to expand slightly to the desired initial size. The result of this over-compress and relax process is to radically reduce the stress in, and the expansive force of the stent against, the delivery system.
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