Percutaneous filter for carotid angioplasty

• US 5,695,519 A
• Filed: 11/30/1995
• Issued: 12/09/1997
• Est. Priority Date: 11/30/1995
• Status: Expired due to Fees

• Current Assignee: David P. Summers
• Original Assignee: American Biomed, Inc.
• Inventors: Ball, Gary, Summers, David P.
• Primary Examiner(s): LEWIS, WILLIAM W
• Application Number:
  US08/565,256
• Time in Patent Office: 740 Days
• Field of Search: 606/159, 606/170, 606/171, 606/180, 606/200, 606/1, 606/108, 604/22, 128/898, 128/899
• 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 17/320783 through side-hole, e.g. sliding or rotating cutter inside catheter
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• 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 2002/018 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

Abstract

A distal intravascular filter is disclosed for filtering blood flow therethrough and entrapping and retaining embolic debris. The intravascular filter including a small diameter hollow guide wire or tube capable of percutaneous placement of the distal end thereof beyond a carotid stenosis. The distal portion of the tube includes a filter mounted thereon. The filter is deployable from a tightly closed configuration to an open circumference for blocking the unfiltered flow of blood beyond the carotid stenosis. The filter is deployable between open and closed positions by manipulation of an actuating wire extending from the filter and out the proximal end of the tube.

Claims

1. A percutaneous filter, comprising:

a) a hollow tube;

b) a deployable filter mounted about the distal end of said hollow tube, wherein said filter includes an expandable rim at the proximal end thereof and is bonded to said hollow tube at the distal end of said filter; and

c) actuating means for deploying the filter from a collapsed position to an open position.

2. The apparatus of claim 1 wherein said actuating means comprises an elastic memory wire extending through said hollow tube and forming said expandable rim of said filter.

3. The apparatus of claim 1 wherein said memory wire expands radially outwardly through an opening in said hollow tube to form said expandable rim of said filter.

4. An atherectomy catheter for removal of occlusive material in a blood vessel, tract, or cavity comprising:

(a) a catheter tube;

(b) a cutter head assembly attached to the distal end of said catheter tube;

(c) drive means extending through said catheter tube;

(d) cutter means mounted within said cutter head assembly and connected to said drive means;

(e) power means operatively connected to said cutter means;

connected to said catheter tube for evacuating excised occlusive material from the vessel;

(g) a hollow guide wire extending through said catheter and exiting the distal end thereof;

(h) a deployable filter mounted about the distal end of said hollow guide wire; and

(i) actuating means mounted at the proximal end of said hollow guide wire for deploying said filter from a collapsed position to an open position.

5. The apparatus of claim 4 wherein said filter is bonded to said hollow tube at the distal end thereof and includes an expandable rim at the proximal end of said filter.

6. The apparatus of claim 5 wherein said actuating means comprises an elastic memory wire extending through said hollow tube and forming said expandable rim of said filter.

7. The apparatus of claim 6 wherein said memory wire expands radially outwardly through an opening in said hollow tube to form said expandable rim of said filter.

8. A percutaneous filter, comprising:

a) a hollow tube;

b) a deployable filter mounted about the distal end of said hollow tube, wherein said filter includes an expandable rim at the proximal end thereof and is bonded to said hollow tube at the distal end of said filter; and

c) actuating means for deploying the filter from a collapsed position to an open position, wherein said actuating means comprises an elastic memory wire extending through said hollow tube and forming said expandable rim of said filter.

9. A method for removing occlusive material in a blood vessel, tract or cavity, comprising the steps of:

a) advancing a hollow guide wire having deployable filter means mounted on the distal end thereof into the blood vessel to a position beyond the occlusion;

b) advancing cutter means over the guide wire into the blood vessel to a position for removing the occlusion, said cutter means including means for removing severed occlusive material from the site of the occlusion;

c) deploying said filter means radially outwardly into contact with the blood vessel wall;

d) rotating said cutter means and thereby severing the occlusive material and removing severed material from the site of the occlusion;

e) trapping severed material released into the blood flow by the cutting action of said cutter means, said released severed material trapped and retained by said filter means;

f) collapsing said filter means about said hollow guide wire; and

g) withdrawing said cutter means and said filter means with the trapped severed material from the blood vessel.