a device for sealing an opening or puncture in the wall of a blood vessel or other percutaneous openings . the device includes a shaft section member of a small diameter , with an expandable balloon and atraumatic tip at its distal end . the proximal end of the device has an inflation / deflation port which is utilized to inflate the balloon once it is in place within the blood vessel or other body cavity . the entire device is placed through a hemostasis vascular introducer or sheath , which is used during invasive percutaneous vascular procedures . the balloon is inflated and withdrawn until it engages the inner surface of the blood vessel . a procoagulant is injected via the introducer to the puncture . after a predetermined time period , the balloon is deflated and the device is withdrawn .