Embolic protection device

• US 8,221,448 B2
• Filed: 06/13/2007
• Issued: 07/17/2012
• Est. Priority Date: 11/07/1997
• Status: Expired due to Fees

• Current Assignee: Salviac Ltd. (Abbott Laboratories Incorporated)
• Original Assignee: Salviac Ltd. (Abbott Laboratories Incorporated)
• Inventors: Gilson, Paul, Brady, Eamon, Maher, Padraig, Vale, David, Taylor, Charles
• Primary Examiner(s): TYSON, MELANIE RUANO
• Application Number:
  US11/762,283
• Publication Number:
  US 20070233181A1
• Time in Patent Office: 1,861 Days
• Field of Search: 606/200
• US Class Current: 606/200
• CPC Class Codes: A61B 2017/22051 with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation A61B2017/22048, A61B2017/3486 take precedence
• CPC Class Codes: A61B 2017/22067 Blocking; Occlusion A61B2017/22054 takes precedence
• CPC Class Codes: A61F 2/0108 Both ends closed, i.e. legs gathered at both ends
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• 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 2002/015 Stop means therefor
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• 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 2230/0067 conical
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2230/0097 Harpoon-shaped

Abstract

An embolic protection device has a collapsible filter element (105) mounted on a carrier such as a guidewire (101). The filter element (105) collapses into the outer end of a catheter (118) for deployment and retrieval through a vascular system of a patient. The filter element (105) has a collapsible filter body with a proximal inlet end and a distal outlet end. The proximal inlet end has inlet openings sized to allow blood and embolic material enter the filter body. The outlet end has outlet openings which allow through passage of blood but retain embolic material within the filter body. After use, the catheter (118) is movable along the guidewire (101) to engage the proximal end of the filter element and close the inlet openings before sliding over the filter element from the proximal end to the distal end to progressively collapse the filter body on the guidewire (101) for retrieval. The filter element (105) may conveniently be mounted on a tubular sleeve (104) which is slidable and rotatable on the guidewire (101) between spaced-apart stops (106, 120) on the guidewire (101) which allows some manipulation of the guidewire independently of the filter when the filter is in use.

Claims

1. An embolic protection filter comprising:

a filter body having an inlet end and an outlet end, the inlet end of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body when the filter body is in an expanded position, the outlet end of the filter body having a plurality of outlet openings sized to allow through passage of blood but to retain undesired embolic material within the filter body; and

a filter support being movable between a collapsed position for movement through the vascular system and an extended outwardly projecting position to support the filter body in the expanded position;

wherein the filter body comprises the inlet end, the outlet end and an intermediate section extending from the distal end of the inlet end to the proximal end of the outlet end, at least part of the intermediate section comprising a cylindrical shape configured to make tubular contact between the filter body and an interior wall of a vasculature when the filter body is in the expanded position,

in the expanded position the intermediate section comprises three parts, a proximal cylindrically shaped section, a distal cylindrically shaped section, and a linking section extending between the proximal cylindrically shaped section and the distal cylindrically shaped section, both the proximal and distal cylindrically shaped sections configured to make tubular contact between the filter body and an interior wall of a vasculature when the filter body is in the expanded position, and

an outside diameter of the linking section is smaller than an outside diameter of both the proximal cylindrically shaped section and the distal cylindrically shaped section.

2. An embolic protection filter as claimed in claim 1, wherein the filter support is self-expanding.

3. An embolic protection filter as claimed in claim 1, wherein the filter support is made from a shape memory material.

4. An embolic protection filter as claimed in claim 1, wherein the filter support is made from Nitinol.

5. An embolic protection filter as claimed in claim 1, wherein the filter body is made from polyurethane or PET.

6. An embolic protection filter as claimed in claim 1, wherein the inlet end comprises a frusto-conical shape tapering proximally from the intermediate section.

7. An embolic protection filter as claimed in claim 1, wherein the outlet end comprises a frusto-conical shape tapering distally from the intermediate section.

8. An embolic protection filter as claimed in claim 1, wherein the filter body comprises a shaped polymeric film.

9. An embolic protection filter as claimed in claim 1, wherein when the filter support is in the extended outwardly projecting position, the embolic protection filter is disposed on a guidewire and the guidewire is free to rotate and translate relative to the embolic protection filter.

10. An embolic protection filter as claimed in claim 1, wherein in the expanded position, the inlet end comprises a frusto-conical shape tapering proximally from the intermediate section, and the outlet end comprises a frusto-conical shape tapering distally from the intermediate section.

11. An embolic protection filter as claimed in claim 10, wherein an outside diameter of the proximal cylindrically shaped section and an outside diameter of the distal cylindrically shaped section is constant along the intermediate section.

12. An embolic protection filter as claimed in claim 11, wherein the filter body comprises a shaped polymeric film.

13. An embolic protection filter as claimed in claim 1, wherein the part of the intermediate section comprising a cylindrical shape has a constant outside diameter.