Access assembly with a pierceable sealing member

An access assembly to provide access to the interior of a vessel or a fluid guide comprising:

• a base extending through a sidewall of the vessel and having a first tubular sealing portion defining a passageway axially extending therethrough,
• a pierceable sealing member arranged across the first tubular sealing portion to obstruct the passageway,
• at least one closure member axially displaceable relative to the base between
• a sealing position, in which the closure member completely obstructs and seals the passageway, and
• a leakage position, in which the closure member leakily obstructs the passageway and in which leakage position the closure member is securely fastened in the passageway,
• an insert axially slidingly displaceable in the base between a sealing position, a leakage position, and a release position, wherein the insert comprises a second tubular sealing portion,
• a proximal closure member sealingly engaging with the second tubular sealing portion, and
• a distal closure member sealingly engaging with the first tubular sealing portion.