apparatus for sealing a vascular wall penetration disposed at the end of the tissue tract comprises a shaft , an occlusion element , a hemostatic implant , and a protective sleeve . the apparatus is deployed through the tissue tract with the occlusion element temporarily occluding the vascular wall penetration and inhibiting backbleeding therethrough . the hemostatic implant , which will typically be a biodegradable polymer such as collagen carrying an anti - proliferative agent or coagulation promoter , will then be deployed from the sealing apparatus and left in place to enhance closure of the vascular wall penetration with minimum scarring . the implant may be radiopaque to allow observation before release .