Distal protection device and method

• US 20060100662A1
• Filed: 12/21/2005
• Published: 05/11/2006
• Est. Priority Date: 03/06/1997
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Adams, Daniel O., Daniel, John M. K., Broome, Thomas E., Holtan, David J., Cassell, Robert L.
• Granted Patent: US 7,780,696 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• 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 2017/00539 hydraulically
• CPC Class Codes: A61B 2017/22049 Means for locking the guide wire in the catheter
• CPC Class Codes: A61B 2017/22061 for spreading elements apart
• 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 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2230/0076 ellipsoidal or ovoid
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: A61F 2230/0086 Pyramidal, tetrahedral, or wedge-shaped

Abstract

An emboli capturing system captures emboli in a body lumen. A first elongate member has a proximal end and a distal end. An expandable emboli capturing device is mounted proximate the distal end of the first elongate member, and is movable between a radially expanded position and a radially contracted position. When in the expanded position, the emboli capturing device forms a basket with a proximally opening mouth. A second elongate member has a proximal and a distal end with a lumen extending therebetween. The lumen is sized to slidably receive a portion of the first elongate member. An expandable delivery device is mounted to the distal end of the second elongate member and is movable from a radially retracted position to a radially expanded position. The delivery device has a receiving end configured to receive the emboli capturing device, and retains at least the mouth of the emboli capturing device in a radially retracted position.

Claims

1. A medical device for filtering stenotic debris from a blood vessel, comprising:

an elongate shaft having a proximal end and a distal end;

a filter coupled to the shaft adjacent the distal end, the filter having a proximal region and a distal region;

wherein the proximal region of the filter includes a loose mesh that is sized to allow stenotic debris to pass therethrough; and

wherein the distal region of the filter includes a tight mesh that is sized to prevent the passage of stenotic debris.

2. The medical device of claim 1, wherein the loose mesh spans both the proximal and distal regions of the filter, and wherein the tight mesh is defined by a microporous membrane disposed over the loose mesh at distal region of the filter.

3. The medical device of claim 1, wherein the filter includes one or more struts.

4. The medical device of claim 3, wherein the struts define the loose mesh, the tight mesh, or both.

5. The medical device of claim 3, wherein the struts are distinct from the both the loose mesh and the tight mesh.

6. An embolic protection filtering device for filtering debris from a blood vessel, comprising:

an elongate shaft having a proximal end and a distal end;

a filter coupled to the shaft adjacent the distal end, the filter having a proximal strut region having one or more openings and a distal filtering region having one or more openings; and

wherein the one or more openings in the proximal region is larger than the one or more openings in the distal region.

7. The filtering device of claim 6, wherein the proximal strut region of the filter includes a first mesh that is sized to allow vascular debris to pass therethrough.

8. The filtering device of claim 6, wherein the distal filtering portion of the filter includes a second mesh that is sized to prevent the passage of vascular debris.

9. An embolic protection filtering device, comprising:

a guidewire having a proximal end region and a distal end region;

a filter coupled to the distal end region of the guidewire, the filter having a strut portion and a filtering portion;

the strut portion of the filter being defined by a porous mesh that allows vascular debris to pass therethrough; and

the filtering portion of the filter being defined by a microporous mesh that is smaller than the porous mesh and that is sized to prevent the passage of vascular debris.

10. The filtering device of claim 9, wherein the porous mesh spans both the strut portion and the filtering portion of the filter, and wherein the microporous mesh is defined by a filtering membrane disposed over the porous mesh at filtering portion of the filter.

11. The filtering device of claim 9, wherein the filter includes one or more struts.

12. The filtering device of claim 11, wherein the struts define the porous mesh, the microporous mesh, or both.

13. The filtering device of claim 11, wherein the struts are distinct from the both the loose mesh and the tight mesh.

14. An embolic protection filtering device, comprising:

a guidewire having a proximal end region and a distal end region;

a filter coupled to the distal end region of the guidewire, the filter having a proximal strut region and a distal filtering region; and

wherein an intersection region is defined at the intersection of the proximal strut region and the distal filtering region, the intersection region following a path that includes one or more struts extending proximally and one or more struts extending distally.

15. The filtering device of claim 14, wherein the proximal strut region of the filter includes a first mesh that is sized to allow vascular debris to pass therethrough.

16. The filtering device of claim 14, wherein the distal filtering portion of the filter includes a second mesh that is sized to prevent the passage of vascular debris.