DEVICE FOR RETRIEVING A FOREIGN OBJECT LOCATED IN A BODY VESSEL

• US 20090306678A1
• Filed: 06/04/2008
• Published: 12/10/2009
• Est. Priority Date: 06/04/2008
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated)
• Inventors: Hardert, Michael W., Deckard, Michael D.
• Granted Patent: US 8,167,903 B2
• Time in Patent Office: Days
• US Class Current: 606/127
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/00336 with a protective sleeve, e.g. retractable or slidable
• CPC Class Codes: A61B 2017/22035 for retrieving or repositioning foreign objects
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means

Abstract

In at least one embodiment of the present invention, a retrieval device for entrapping and retaining a foreign object located in a body vessel for its extraction therefrom is provided. The device comprises a cage having a proximal end and a distal end and a longitudinal axis extending between the proximal and distal ends. The cage is radially expandable about the longitudinal axis to define an expanded state and to form an opening at the distal end for receiving the foreign object. The cage is collapsible to define a collapsed state and to retain the foreign object therein such that the foreign object is substantially aligned with the longitudinal axis. Extending proximally from the proximal end of the cage is a cable for retrieval of the device in the collapsed state.

Claims

1. A retrieval device for entrapping and retaining a foreign object located in a body vessel for its extraction therefrom, the device comprising:

a cage having a proximal end and a distal end and a longitudinal axis extending between the proximal and distal ends, the cage including;

a plurality of longitudinal bars extending between the proximal and distal ends; and

a plurality of struts each having a pivotal joint and connecting the longitudinal bars together, the pivotal joints unfolding to move the longitudinal bars radially outward from the longitudinal axis, radially expanding the cage about the longitudinal axis to define an expanded state and forming an opening at the distal end for receiving the foreign object, and the pivotal joints folding to collapse the longitudinal bars along the longitudinal axis, collapsing the cage to define a collapsed state and to retain the foreign object therein such that the foreign object is substantially aligned with the longitudinal axis; and

a cable extending proximally from the proximal end of the cage for retrieval of the device in the collapsed state.

2. The retrieval device according to claim 1 wherein the cage is configured to be disposed within a sheath to restrain the cage in the collapsed state and to self-expand to the expanded state upon being advanced out of the sheath.

3. The retrieval device according to claim 1 wherein the cable has a lumen formed therethrough providing fluid communication between the cage and one of an aspirating source and an injection source.

4. The retrieval device according to claim 1 wherein the cage includes at least one of Nitinol, Nickel-Titanium alloy, shape memory alloy and stainless steel.

5. The retrieval device according to claim 1 wherein the cage in the expanded state has a maximum diameter less than a diameter of a lumen of the body vessel allowing the cage in the expanded state to be moved distally and proximally within the body vessel.

6. The retrieval device according to claim 1 wherein each strut has two ends connecting two adjacent longitudinal bars together, the pivotal joint being disposed between the two ends and extending therefrom generally towards the proximal end of the cage.

7. The retrieval device according to claim 6 wherein the struts are biased inwardly toward the longitudinal axis to facilitate retaining the foreign object within the cage.

8. The retrieval device according to claim 7 wherein the struts in the expanded state are positioned at an angle to the longitudinal axis of less than about 45 degrees.

9. The retrieval device according to claim 1 wherein the struts have a “

V”

shape in the expanded state.

10. The retrieval device according to claim 1 wherein the struts are self-expanding and circumferentially aligned about at least one location along the longitudinal axis forming at least one ring that is connected to each of the longitudinal bars, providing radial force to expand the cage.

11. The retrieval device according to claim 10 wherein one of the at least one ring is formed at the distal end of the cage.

12. The retrieval device according to claim 1 wherein the cage further includes a connecting joint at the proximal end of the cage, each of the longitudinal bars being connected to the connecting joint which is connected to the cable.

13. The retrieval device according to claim 12 wherein the connecting joint has a diameter defined by the connection of the longitudinal bars with the connection joint, the diameter being less than a maximum diameter of the cage in the expanded state.

14. A retrieval device for entrapping and retaining a foreign object located in a body vessel for its extraction therefrom, the device comprising:

a cage having a proximal end and a distal end and a longitudinal axis extending between the proximal and distal ends, the cage being radially expandable about the longitudinal axis to define an expanded state and to form an opening at the distal end for receiving the foreign object, and being collapsible to define a collapsed state and to retain the foreign object therein such that the foreign object is substantially aligned with the longitudinal axis; and

a cable extending proximally from the proximal end of the cage for retrieval of the device in the collapsed state.

15. The retrieval device according to claim 14 wherein the cage is configured to be disposed within a sheath to restrain the cage in the collapsed state and to self-expand to the expanded state upon being advanced out of the sheath.

16. The retrieval device according to claim 14 wherein the cable has a lumen formed therethrough providing fluid communication between the cage and one of an aspirating source and an injection source.

17. The retrieval device according to claim 14 wherein the cage in the expanded state has a maximum diameter less than a diameter of a lumen of the body vessel allowing the cage in the expanded state to be moved distally and proximally within the body vessel.

18. A retrieval kit for entrapping and retaining a foreign object located in a body vessel for its extraction therefrom, the kit comprising:

a sheath for positioning in the body vessel; and

a retrieval device including;

a cage having a proximal end and a distal end and a longitudinal axis extending between the proximal and distal ends, the cage being radially expandable about the longitudinal axis to define an expanded state and to form an opening at the distal end for receiving the foreign object, and being collapsible to define a collapsed state and to retain the foreign object therein such that the foreign object is substantially aligned with the longitudinal axis, the cage configured to be disposed within the sheath in the collapsed state and to be advanced out of the sheath for expanding into the expanded state; and

a cable extending proximally from the proximal end of the cage for recovering the cage into the sheath to retrieve the device in the collapsed state.

19. The kit according to claim 18 further comprising a guide catheter for percutaneous insertion into the body vessel and through which the sheath is inserted to position the sheath within the body vessel.

20. The kit according to claim 19 further comprising a guidewire for guiding the guide catheter in the body vessel.

21. The kit according to claim 18 wherein the cage includes:

a plurality of longitudinal bars extending between the proximal and distal ends of the cage;

a plurality of struts each having a pivotal joint and connecting the longitudinal bars together, the pivotal joints folding to collapse the longitudinal bars along the longitudinal axis defining the collapsed state of the cage and unfolding to move the longitudinal bars radially outward from the longitudinal axis defining the expanded state of the cage;

a connecting joint at the proximal end of the cage, each of the longitudinal bars being connected to the connecting joint which is connected to the cable; and

wherein the struts are self-expanding and circumferentially aligned about at least one location along the longitudinal axis forming at least one ring that is connected to each of the longitudinal bars, providing radial force to expand the cage.

22. A method for entrapping and retaining a foreign object located in a body vessel for its extraction therefrom, the method comprising:

deploying a retrieval device within the body vessel, the device including a cage having a proximal end and a distal end and a longitudinal axis extending between the proximal and distal ends;

radially expanding the cage about the longitudinal axis to form an opening at the distal end for receiving the foreign object; and

collapsing the cage via a cable extending proximally from the proximal end of the cage for retrieval of the device, defining a collapsed state and retaining the foreign object therein such that the foreign object is substantially aligned with the longitudinal axis.

23. The method according to claim 22 wherein the cage is self-expanding and the method further comprises positioning a sheath in the body vessel, the sheath having the cage disposed therein restrained in the collapsed state and the step of deploying includes advancing the cage out of the sheath to release the cage within the body vessel and the step of collapsing includes recovering the cage into the sheath via the cable to restrain the cage in the collapsed state.