A side-to-end vascular anastomosis stapling apparatus that includes a stapling tool (10), a staple forming tool (11) and a staple (12). The stapling tool (10) includes a sleeve (13), a core unit (14), a mandrel (16) and a trigger unit (17). The core unit (14) includes a plurality of fingers (26) that can be selectively urged outwardly by interaction with the mandrel (16) to grip the staple (12). The staple (12) has a plurality of vessel and interior wall engaging members (43), and a plurality of exterior wall engaging members (44).
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