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A system for treating an aneurysm in a vessel includes a delivery device having a delivery portion suitable for delivery of embolic material. The delivery device is placed in a neck of the aneurysm and an expandable member is placed proximate the neck. The expandable member is expanded to overlie su

A system for treating an aneurysm in a vessel includes a delivery device having a delivery portion suitable for delivery of embolic material. The delivery device is placed in a neck of the aneurysm and an expandable member is placed proximate the neck. The expandable member is expanded to overlie substantially the entire neck. Embolic material is delivered to the aneurysm with a delivery device. The expandable member is held over the neck to inhibit movement of the embolic material out of the aneurysm. Blood is allowed to flow out of the aneurysm, past the neck of the aneurysm, and through the vessel while the expandable member is held over the neck of the aneurysm.

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1. A medical shield device insertable into a body lumen comprising:a first elongated member having a proximal end and a distal end and an elongated length therebetween;a second elongated member having a proximal end and a distal end and an elongated length therebetween and the second elongated membe

1. A medical shield device insertable into a body lumen comprising:a first elongated member having a proximal end and a distal end and an elongated length therebetween;a second elongated member having a proximal end and a distal end and an elongated length therebetween and the second elongated member being slidable relative to the first elongated member;a shield coupled to the first elongated member and the shield having an expandable profile; anda hub coupled to the second elongated member and slidable therewith and the hub including a proximal end and a distal end and the hub including a portion deployable about the shield to retain the shield in a collapsed profile and a proximal surface deployable to abut the shield to expand the shield to a radially expanded profile. 2. The medical shield device of claim 1 wherein the shield includes a plurality of circumferentially spaced and radially expandable shield members which are radially expanded from a collapsed profile via engagement of the proximal surface of the hub with an interior surface of the plurality of shield members. 3. The medical shield device of claim 1 wherein first elongated member is a tubular member having a lumen and the second elongated member is slidably disposed in the lumen of the first elongated member. 4. The medical shield device of claim 3 wherein a distal portion of the first elongated member includes a plurality longitudinal slits to form a plurality of circumferentially spaced radially expandable shield members which are radially expandable from a collapsed profile to form the shield having the expandable profile. 5. The medical shield device of claim 4 wherein the plurality of shield members are heatset in a normally expanded profile. 6. The medical shield device of claim 2 wherein the hub includes a cavity enclosed by the portion deployable about the shield and a distal portion of the plurality of shield members are insertable into the cavity to retain the plurality of shield members in the collapsed profile. 7. The medical shield device of claim 6 wherein the cavity tapers inwardly from the proximal end of the hub and tips of the plurality of shield members are distally tapered inwardly so that the hub is slidable over the tips of the plurality of shield members to collapse the plurality of shield members to the collapsed profile. 8. A method of deploying a medical shield comprising steps of:inserting a treatment device including a radially expandable shield retained in a collapsed profile by a hub slidably engaged with the shield into a body lumen and positioning the shield proximate to a treatment site;moving the hub distally relative to the shield to disengage the hub from the shield; andproximally retracting the hub towards the shield to engage the shield to radially expand the shield to a radially expanded profile. 9. The method of claim 8 wherein the shield is disposed in a cavity of the hub to retain the shield in the collapsed profile and the step of moving the hub distally removes the shield from the cavity. 10. The method of claim 8 wherein the step of proximally retracting the hub retracts a proximal surface of the hub to abut the shield to radially expand the shield. 11. The method of claim 8 wherein the shield is deployed at a mouth of an aneurysm to cover the mouth of the aneurysm. 12. The method of claim 8 wherein the shield includes a plurality of circumferentially spaced shield members and the hub includes a cavity enclosed by a rim portion and tips of the plurality of shield members are disposed in the cavity to retain the plurality of shield members in a collapsed profile and the hub is moved distally to withdraw the tips from the cavity and moved proximally to bias a proximal surface of the hub against the plurality of shield members to bias the shield members radially outwardly. 13. The method of claim 8 and further comprising the steps of;distally moving the hub to disengage the hub from the shield; andproximally retractin g the hub about the shield to retain the shield in the collapsed profile. 14. The method of claim 13 wherein the hub includes a proximal surface which abuts the shield to radially expand the shield and the steps of distally moving the hub to disengage the hub from the shield withdraws the proximal surface of the hub from the shield. 15. The method of claim 13 wherein the hub includes a cavity enclosed by a rim portion and the step of proximally retracting the hub about the shield retracts the shield into the cavity to retain the shield in the collapsed profile.