Abstract: A surgical instrument including a system for stopping a beam of the surgical instrument from impacting a distal pin when reversing a knife is disclosed. A knife assembly of the surgical instrument comprises the knife, the beam, and a firing nut. A firing lead screw can drive the firing nut distally and proximally. A firing screw compression spring extends along the firing lead screw and applies a load proximally on the firing nut when the firing nut is driven toward a distal end of the firing lead screw.

Abstract: A system for preventing unwanted tissue migration in surgical staplers includes a surgical stapler having an end effector including an upper jaw and a lower jaw. A distal end of the upper jaw is connected to a distal end of the lower jaw, and a proximal end of the upper jaw is connected to a proximal end of the lower jaw. First and second tissue stops are formed on the distal and proximal ends of the lower jaw, respectively. The second tissue stop and the proximal end of the upper jaw define a no cut zone when the surgical stapler is in an open position. The surgical stapler also includes a tissue cutting device disposed within the lower jaw for resecting tissue. The system also includes a warning, blocking, impeding, or barrier forming device for preventing the unwanted migration of tissue into the no tissue zone.

Abstract: A system utilizing a software program used to write other software application programs for the implementation of guideline applications for use in situations where a qualification decision or next course of action determination must be made. The system uses questions with limited choice answers. Data provided in answer to the questions causes a second program application to be automatically generated based on the answers. The second application then elicits responses in an interactive manner. Qualification decisions and courses of action are suggested as an output of the second application. Means are provided for evaluating the reliability of the suggestions based on consistency of answers and fatigue of the user. Means are also provided for editing either application program.