Patent ID: 7691127

Claim:
A device for closing a blood vessel puncture site disposed at a distal end of a tissue tact, the device comprising: a tubular shaft having a proximal end and a distal end, the tubular shaft being configured to advance through the tissue tact; a biochemical agent which promotes hemostatics deposited in a biochemical region disposed on the tubular shaft near its distal end; an expansible member disposed on the tubular shaft distal to the biochemical region, said expansible member being deployable within the blood vessel; and a tubular sealing member slidably disposed over the tubular shaft and having a distally advanced position which provides a barrier over the biochemical region and a proximally retracted position which exposes the biochemical region, wherein the biochemical agent is released from the biochemical region only when the tubular sealing member is in its proximally retracted position; wherein the tubular sealing member has a proximal end and a distal end, said device further comprising a coil spring tensioning element disposed coaxially over the tubular shaft, under the tubular sealing member and proximal the expansible member, wherein the coil spring tensioning element has a proximal end attached to the proximal end of the tubular sealing member and a distal end attached to the tubular shaft so that proximal retraction of the tubular sealing member relative to the distal end of the tubular shaft both exposes the biochemical region and applies tension to the tubular shaft in a proximal direction to seat the expansible member against the puncture site.