초록 ▼

In a surgical stapler having a driver and an anvil for forming a staple in tissue, a four-bar linkage is driven by a drive cam which is at least partially curved. The curved cam provides, with the linkage, an increasing mechanical advantage for reducing forces required to operate the stapler and to

In a surgical stapler having a driver and an anvil for forming a staple in tissue, a four-bar linkage is driven by a drive cam which is at least partially curved. The curved cam provides, with the linkage, an increasing mechanical advantage for reducing forces required to operate the stapler and to form a staple. The drive minimizes the range of forces required to operate the stapler throughout an operating cycle. Cam and linkage relationships are disclosed.

대표청구항 ▼

In a surgical stapler having a staple driver, a four-bar linkage for operating the staple driver and comprising: a bell crank operatively connected to said driver and pivoted to said stapler at a first pivot; two drive links pivoted together by a drive pin; a first one of said links pivoted to said

In a surgical stapler having a staple driver, a four-bar linkage for operating the staple driver and comprising: a bell crank operatively connected to said driver and pivoted to said stapler at a first pivot; two drive links pivoted together by a drive pin; a first one of said links pivoted to said bell crank; a second one of said links pivoted to said stapler at a second pivot; and a drive cam means mounted on said stapler for motion with respect to said stapler and for engaging and moving said drive pin to operate said driver; said drive cam means comprising a partially curved and partially straight cam surface.