A sensor implantation assembly is disclosed that includes a tissue puncture closure device. The tissue puncture closure device has a proximal end portion and a distal end portion and a suture extending from the proximal end portion to the distal end portion. A suture anchor assembly is also included that is insertable through a tissue wall puncture. The suture anchor assembly is attached to the suture at the distal end portion of the closure device and has a diagnostic sensor. A sealing pad is positioned around the suture at the distal end portion and is slidable along the suture. The diagnostic sensor may be placed within a tissue wall to gather diagnostic information such as pressure measurements at or near the site of the tissue puncture closure.
