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A surgical stapling instrument for performing a vascular anastomosis procedure comprises an elongated body 10 and a needle 12 having a hook 12b for penetrating and everting the edges 56, 58 of tissue to be joined. The needle 12 is slidable in the body 10 between an extended position as shown and a r

A surgical stapling instrument for performing a vascular anastomosis procedure comprises an elongated body 10 and a needle 12 having a hook 12b for penetrating and everting the edges 56, 58 of tissue to be joined. The needle 12 is slidable in the body 10 between an extended position as shown and a retracted position wherein the hook is engaged with the end 10a of the body. A stapling mechanism includes a slidable pusher 40 for driving a staple 36 longitudinally of the body 10 against the inside of the hook 12b for deformation of the staple into penetrating engagement with the everted tissue edges 56, 58.

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1. A surgical stapling instrument for stapling edges of tissue to be joined, the instrument comprising an elongated body and, carried by the body, a rigid member having a hooked end for penetrating the edges of tissue to be joined and stapling means for applying a staple having opposed legs to the e

1. A surgical stapling instrument for stapling edges of tissue to be joined, the instrument comprising an elongated body and, carried by the body, a rigid member having a hooked end for penetrating the edges of tissue to be joined and stapling means for applying a staple having opposed legs to the edges held by the hooked end of the rigid member such that each leg penetrates an edge of tissue and substantially simultaneously deforms toward one another against the hooked end to join the edges of tissue. 2. The instrument of claim 1, wherein the stapling means comprises means for driving a staple longitudinally of the body against an inside of the hooked end of the rigid member for deformation of the staple into penetrating engagement with the edges. 3. The instrument of claim 2, wherein an inner edge of the rigid member has a channel which provides a guide track for the staple. 4. The instrument of claim 3, wherein the rigid member has a substantially straight portion extending into the body with said hooked end being formed at one end of the straight portion, wherein within the body the staple is guided towards the hooked end by sliding along a slot in the body with one leg of the staple engaging the channel in the straight portion of the rigid member, and wherein within the hooked end of the rigid member the staple is guided by sliding engagement of the opposite legs of the staple with the channels in the opposite sides of the hooked end respectively. 5. The instrument of claim 4, wherein the rigid member is slidable longitudinally of the elongated body between an extended position wherein the hooked end is free of the said end of the body for penetrating the edges of a wound and a retracted position wherein opposite sides of the booked end are engaged with the body to allow the staple to be driven against the inside of the hooked end, the stapler further including means for sliding the rigid member between the extended and retracted positions. 6. The instrument of claim 5, wherein each of the rigid member sliding means and staple driving means comprises a respective manually operable slider mounted on the body. 7. The instrument of claim 6, wherein said rigid member is a curved needle. 8. The instrument of claim 7, wherein said rigid member is operable to evert the edges of the tissue as they are penetrated. 9. The instrument of claim 2, wherein the degree of staple deformation can be adjusted. 10. A method of stapling the edges of tissue to be joined, comprising the steps of: a) penetrating the edges of tissue to be joined with a rigid member having a hooked end; and b) applying a staple having opposed legs to the edges held by the hooked end of the rigid member such that each leg penetrates an edge of tissue and substantially simultaneously deforms toward one another against the hooked end to join the edges of tissue. 11. A surgical stapling instrument for stapling folds of tissue to be joined, the instrument comprising an elongated body and, carried by the body, a rigid member having a hooked end for penetrating the folds of tissue to be joined and stapling means for applying a staple having opposed lees to the folds by the hooked end of the rigid member such that each leg penetrates a fold of tissue and substantially simultaneously deforms toward one another against the hooked end to join the folds of tissue. 12. A method of stapling folds of tissue to be joined, comprising the steps of: a) penetrating the folds of tissue to be joined with a rigid member having a hooked end; and b) applying a staple having opposed legs to the folds held by the hooked end of the rigid member such that each leg penetrates a fold of tissue and substantially simultaneously deforms toward one another against the hooked end to join the edges of tissue.