Surgical suturing instrument

Claim 1

A surgical suturing instrument for establishing circular compression anastomoses in the organs of the digestive tract, comprising a needle arrangement (5) accommodated in a hollow body (1) and having a first ring-shaped element (6) with a plurality of holes (8), and a second ring-shaped element (7) coaxial with the first one and carrying a number of needles (9) fixed in position thereon, each of said needles corresponding to one of the holes (8) in the first ring-shaped element (6), while at least part of the needles have a locking cone (10) at the free end thereof; a rod (2) accommodated in the hollow body (1), said rod carrying at one of its ends a connecting ring (13) fixed stationary with the aid of a nut (12), the connecting ring being adapted for the needles (9) to pass through when establishing an anastomosis and those needles which have a locking cone (10) get secured in position in the connecting ring (13), a hollow cylindrical knife (3) having such an inside diameter that enables the nut (12) to pass freely therethrough, the knife being held to a hollow tube (4) which is arranged coaxially in the hollow body (1) and which accommodates the rod (2) located coaxially therewith, and a mechanical actuator of the hollow cylindrical knife (3) adapted to interact with the hollow tube (4), characterized in that it has a pusher (19) upon one of whose ends rests the second ring-shaped element (7) of the needle arrangement (5), while its other end has a hollow chamfer (20) and a stop (21) which is adapted to interact with a stop (22) of the hollow body (1) so as to restrict the travel of the second ring-shaped element (7) in the course of anastomosing, a split bush (23) fitted on the hollow tube (4) and having an outside taper collar (24) adapted to engage the hollow chamfer (20) of the pusher (19) and a retainer (25) of the split bush (23) located on the hollow tube (4) inside the split bush (23).