Cannula with retractable spring-loaded arced tip
A cannula to access the deep pelvic space of a patient from the patient's abdomen that is generally inaccessible from the incision due to being obstructed by the patient's sacral promontory is presented. The cannula can have an inner tube that slides within a rigid outer tube. The inner tube has a suction-irrigation tip located at the distal tube end and a spring-loaded pre-bent tube section interposed between the suction-irrigation tip and a rigid inner tube, which extends from the flexible tube section, outside of the proximal end of the rigid outer tube, where it is attached to a handle. The pre-bent tube section can comprise at least one arc or bend. A handle connected to the tubes has an exit port centered in the handle, which is configured to suck fluid buildup in the deep pelvic space when the exit port is connected to a suction source via a suction tube.
1 . A cannula arrangement comprising:
a handle defined between a handle distal end and a handle proximal end;
a rigid outer tube extending to an outlet port from the handle distal end, wherein no portion of the rigid outer tube is covered by another tube of the cannula arrangement from the handle distal end to the outlet port, the rigid outer tube is immobile relative to the handle distal end;
an inner tube having only a single passageway defined between a proximal tube end and a distal tube end, wherein an outer surface circumference of the inner tube confronts and slidingly engages an inner surface circumference of the rigid outer tube;
a suction-irrigation tip connected to the distal tube end, the suction-irrigation tip comprising a plurality of perforations that are in constant fluid communication with an irrigation and suction port at the proximal tube end, the suction-irrigation tip is never in the rigid outer tube;
the inner tube comprising a flexible tube segment interposed between the suction-irrigation tip and a rigid inner tube segment, the rigid inner tube segment extending from the flexible tube segment to the proximal tube end, wherein the inner tube is not configured to contain material other than that consisting of irrigation fluid or bodily fluid when in operation.
2 . The cannula arrangement of claim 1 , wherein the flexible tube segment comprises a first pre-bent section having a first arc when unconstrained by the rigid outer tube and a second pre-bent section having a second arc when unconstrained by the rigid outer tube, the first arc is defined by a larger radius than the second arc.
3 . The cannula arrangement of claim 2 , wherein the first pre-bent section is stiffer than the second pre-bent section.
4 . The cannula arrangement of claim 1 , wherein the cannula arrangement is used with a trocar and wherein the inner tube is an aspiration tube.
5 . The cannula arrangement of claim 1 , wherein the inner tube is a single piece of material.
6 . The cannula arrangement of claim 1 , wherein a first pre-bent section and a second pre-bent section of the flexible tube segment comprise a spiral cut in the inner tube that further comprises a first sleeve that seals the spiral cut.
7 . The cannula arrangement of claim 6 , wherein the first pre-bent section comprises a second sleeve that covers at least a portion of the first sleeve.
8 . The cannula arrangement of claim 6 , wherein the first pre-bent section and the second pre-bent section comprise a compression member extending from the rigid inner tube segment to the suction-irrigation tip, the compression member spring loading the first pre-bent section and the second pre-bent section into two different arcs.
9 . A cannula arrangement comprising:
a handle defined between a handle distal end and a handle proximal end;
a rigid outer tube extending to an outlet port from the handle distal end of the handle, wherein no portion of the rigid outer tube is covered by another tube of the cannula arrangement from the handle distal end to the outlet port;
an inner tube having only one passageway extending from a proximal tube end to a distal tube end;
a suction-irrigation tip attached to the distal tube end, wherein the suction-irrigation tip comprises a plurality of perforations that maintain continuous fluid communication between an external environment and a suction-irrigation port at the proximal tube end which is configured to connect to a hose;
the inner tube comprising a flexible tube segment interposed between the suction-irrigation tip and a rigid inner tube segment, the rigid inner tube segment extending from the flexible tube segment to the proximal tube end, wherein the inner tube is configured to contain only material consisting of air, irrigation fluid and/or bodily fluid when in operation;
the inner tube slidingly engaged in the rigid outer tube, wherein when the inner tube is fully retracted in the rigid outer tube with the suction-irrigation tip abutting the outlet port, the flexible tube segment is entirely in the rigid outer tube and a majority of the rigid inner tube segment is in the rigid outer tube.
10 . The cannula arrangement of claim 9 , wherein the inner tube is comprised of a single piece of material.
11 . The cannula arrangement of claim 9 , wherein when the flexible tube segment is not in the rigid outer tube, the flexible tube segment is arced, and wherein the flexible tube segment when arced comprises at least one curvature that starts at the distal tube end and terminates at the rigid inner tube segment.
12 . The cannula arrangement of claim 11 , wherein the flexible tube segment comprises a first arced section and a second arced section when the flexible tube segment is not in the rigid outer tube, the first arced section comprises a first arc that has a larger radius than a second arc of the second arced section.
13 . The cannula arrangement of claim 12 , wherein the first arced section is closer to the suction-irrigation tip than the second arced section.
14 . The cannula arrangement of claim 11 , wherein the inner tube comprises a spiral cut along the flexible tube segment with at least one sleeve that seals the spiral cut, the flexible tube segment further comprises a compression member that bends the flexible tube segment in a shape of the at least one curvature.
15 . The cannula arrangement of claim 14 , wherein the compression member is either a preformed polymer strip comprising the shape of the at least one curvature or a metal wire comprising the shape of the at least one curvature.
16 . The cannula arrangement of claim 9 , wherein the rigid outer tube is immobile relative to the handle distal end.
17 . The cannula arrangement of claim 9 , wherein an outer surface circumference of the inner tube confronts and slidingly engages an inner surface circumference of the rigid outer tube.