Embolic protection device with a filter bag that disengages from a basket

• US 20070016245A1
• Filed: 07/11/2006
• Published: 01/18/2007
• Est. Priority Date: 07/12/2005
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated)
• Inventors: Pal, Dharmendra, Lentz, David
• Granted Patent: US 7,771,452 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61B 17/22031 Gripping instruments, e.g. forceps, for removing or smashing calculi A61B17/221 takes precedence
• 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 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped

Abstract

An embolic protection device includes a basket defined by a section of a set of wires arranged as a plurality of struts. These struts are coupled together at the distal end of the basket in a manner to define an opening at the distal end through which a core wire can reciprocate. Another section of the wires spirals around the core wire to define a hollow channel in which the core wire can reciprocate. A filter bag is attached to the distal end of the core wire such that pulling a proximal end of the core wire relative to the spiraled section engages the filter bag with the distal end of the basket to expand the basket and filter bag for capturing clots, and pushing the core wire disengages the filter bag from the distal end of the basket to collapse the basket and filter bag.

Claims

1. An embolic protection device for capturing emboli during treatment of a stenotic lesion in a body vessel, the device comprising:

a set of wires including a first section arranged as struts that define a basket with a distal end and a proximal end, the basket having an expanded state and a collapsed state, the struts at the distal end of the basket being arranged to define an opening;

a core wire with a distal end and a proximal end, the core wire being able to reciprocate through the opening at the distal end of the basket; and

a filter bag attached only at the distal end of the core wire,

the filter bag being located distally to the distal end of the basket when in the collapsed state, movement of the core wire in the proximal direction relative to the basket causing the filter bag to be disposed over the basket, and further movement of the core wire in the proximal direction causing the basket and the filter bag to open to the expanded state, movement of the core wire in the distal direction relative to the basket causing the basket and the filter bag to close to the collapsed state.

2. The device of claim 1 wherein the filter bag is made of a mesh material.

3. The device of claim 1 wherein the filter bag is made of connective tissue including extracellular matrix.

4. The device of claim 3 wherein the extracellular matrix is made of small intestinal submucosa.

5. The device of claim 1 wherein the set of wires is made of shape memory material with a transition temperature.

6. The device of claim 1 wherein the set of wires is made of superelastic material.

7. The device of claim 6 wherein the superelastic material is Nitinol.

8. The device of claim 1 wherein the filter bag includes a set of radial spokes to provide structural rigidity to the filter bag.

9. The device of claim 9 wherein the radial spokes are pre-set such that the filter bag self-collapses to the collapsed state.

10. An embolic protection device for capturing emboli during treatment of a stenotic lesion in a body vessel, the device comprising:

a basket with a set of struts extending from a distal end to a proximal end of the basket, the struts being arranged at the distal end to define an opening, the basket having an expanded state and a collapsed state;

a core wire with a distal end and a proximal end, the core wire being able to reciprocate through the opening at the distal end of the basket; and

a filter bag attached only at the distal end of the core wire,

the filter bag being located distally to the distal end of the basket when in the collapsed state, movement of the core wire in the proximal direction relative to the basket causing the filter bag to be disposed over the basket, and further movement of the core wire in the proximal direction causing the basket and the filter bag to open to the expanded state, movement of the core wire in the distal direction relative to the basket causing the basket and the filter bag to close to the collapsed state.

11. The device of claim 10 wherein the filter bag is made of a mesh material.

12. The device of claim 10 wherein the filter bag is made of connective tissue including extracellular matrix.

13. The device of claim 12 wherein the extracellular matrix is made of small intestinal submucosa.

14. The device of claim 10 wherein the struts are made of shape memory material with a transition temperature.

15. The device of claim 10 wherein the struts are made of superelastic material.

16. The device of claim 15 wherein the superelastic material is Nitinol.

17. The device of claim 11 wherein the filter bag includes a set of radial spokes to provide structural rigidity to the filter bag.

19. A method for embolic protection during treatment of a stenotic lesion in a body vessel, the method comprising:

disposing an embolic protection device in an undeployed state in the body vessel, the device comprising;

a basket with a set of struts extending from a distal end to a proximal end of the basket, the struts being arranged to define an opening at the distal end;

a core wire with a distal end and a proximal end, the core wire being able to reciprocate through the opening at the distal end of the basket; and

a filter bag attached only at the distal end of the core wire, the filter bag being located distally to the distal end of the basket when in the collapsed state,

moving the core wire relative to the basket to expand the basket and filter bag in a deployed state downstream from the stenotic lesion to capture emboli during treatment of the stenotic lesion.

18. The device of claim 19 wherein the radial spokes are pre-set such that the filter bag self-collapses to the collapsed state.

20. The method of claim 19 further comprising moving the core wire relative to the basket to close the basket to a collapsed state for retrieving the embolic protection device from the body vessel.