tissue is adequately held between both plates 20 30 it is to be noted that timing spring 57 is therefore capable of providing a constant closure pressure throughout the closure and cutting of the tissue this enables the designer to easily adapt stapler 10 to create enough mechanical advantage so that closure and latching as well as cutting can be accomplished in a single stroke of the mechanism or it may be desirable to first pierce the tissue and latch with one stroke of the mechanism then it may be further desirable to complete closure and cut the tissue with a second stroke this may result in further reliability and ease of firing of the mechanism the force from the anvil 60 then overcomes the tissue as well as plates 20 30 and spring 57 force so that the plate 30 abuts knife 40 first knife 40 cuts through the frangible ring 36 then the two layers of tissue frangible ring 26 of plate 20 is then either cut by the knife 40 or broken by the anvil 60 depending upon design specifications what remains therefore is for the entire anvil 60 with tissue and plates 20 30 held therein to be pulled toward the knife 40 so that a volume is held within the handle head 50 this is then pulled away from the connected tissue thus the remaining outer portions 28 38 with tissue held therein and locked against the anvil are held so that a properly anastomosed lumen.