Filter for embolic material mounted on expandable frame

• US 6,277,138 B1
• Filed: 08/17/1999
• Issued: 08/21/2001
• Est. Priority Date: 08/17/1999
• Status: Expired due to Fees

• Current Assignee: Scion Cardio-Vascular Incorporated
• Original Assignee: Scion Cardio-Vascular Incorporated
• Inventors: Palmer, Matthew A., Levinson, Melvin E., Golik, George I.
• Primary Examiner(s): Dawson, Glenn K.
• Application Number:
  US09/376,120
• Time in Patent Office: 735 Days
• Field of Search: 606/1, 606/110, 606/113, 606/127, 606/128, 606/159, 606/167, 606/170, 606/171, 606/191-200, 606/213, 604/523, 604/164.13
• US Class Current: 606/200
• CPC Class Codes: A61F 2/0108 Both ends closed, i.e. legs gathered at both ends
• CPC Class Codes: A61F 2002/015 Stop means therefor
• 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

Abstract

The filter device captures embolic material in a blood vessel and is placed in the blood vessel via a guide wire. The guide wire has a proximal end, a distal end and a stop near its distal end. The filter device includes an expandable frame of frame struts having a closed, radially compact form and an open, radially expanded form. The frame, in the radially expanded form, has frame struts forming a pair of facing frustoconical frame structures. Filter material is attached to one of the pair of frustoconical frame structures. In one embodiment, the filter material is a perforated membrane. The guide wire extends through the expandable frame and the expandable frame is freely movable over the guide wire (likewise, the guide wire is freely movable within the frame), both rotatably and longitudinally, except distally beyond the stop near the distal end of the guide wire. This mobility of the guide wire with respect to the expandable frame enables to guide wire to be guided by the operator through the blood vessel.

Claims

1. A filter device for capturing embolic material comprising:

a guide wire having a proximal end, a distal end and a stop near said distal end;

an expandable frame of frame struts having a closed, radially compact form and an open, radially expanded form, said frame in said radially expanded form forming a pair of facing frame structures;

filter material attached to one of said pair of frame structures;

said guide wire extending through said expandable frame and said guide wire being freely movable, both rotatably and longitudinally, with respect to said expandable frame except distally beyond said stop to enable said guide wire to be guided;

an actuator sleeve running over said guide wire, said actuator sleeve enabling longitudinal compression of said expandable frame and frame struts thereby causing said frame to radially expand and deploy said filter material; and

,

wherein said actuator sleeve extends proximally along said guide wire and includes means for temporarily latching said sleeve and expandable frame in a compressed and filter deployed state.

2. A filter device as claimed in claim 1 wherein said expandable frame includes fore and aft collars through which passes said guide wire, said collars permitting said free longitudinal and rotatable movement relative to said guide wire excepting said stop.

3. A filter device as claimed in claim 2 wherein said filter material has a scalloped edge about a radially large end of said one of said frame structures and said filter material is disposed on one of an inside and an outside of said one of said frame structures.

4. A filter device as claimed in claim 2 wherein said filter material is disposed on one of an interior and an exterior of said expandable frame and said filter material is folded within said closed radially compact form prior to deployment, and said stop is a fled collar on said guide wire.

5. A filter device as claimed in claim 4 wherein said fore collar defines a fore end channel complementary to said fixed collar thereby enabling said expandable frame to be initially locked onto said fixed collar to deploy said filter material and then collapse said frame structure about said guide wire.

6. A filter device as claimed in claim 2 wherein said stop is a fixed collar on said guide wire, said fore collar defines a fore end channel complementary to said fixed collar thereby enabling said expandable frame to be initially locked onto said fixed collar to deploy said filter material and then collapse said frame structure about said guide wire.

7. A filter device as claimed in claim 1 wherein said frame structures form substantially frustoconical frame structures which face each other.

8. A filter device as claimed in claim 1 wherein said means for temporarily latching includes at least one latch stop on said guide wire and an actuator piece adapted to pass over with tactile resistence said at least one latch stop.

9. A filter device as claimed in claim 8 wherein said actuator piece has indicia in dicating the state of radial deployment of said expandable frame.

10. A filter device as claimed in claim 1 wherein said filter material is attached at one of beneath and atop said one of said frame structures.

11. A filter device as claimed in claim 1 wherein said filter material is furled within said radially compact frame form and said expandable frame longitudinally removable over said guide wire.

12. A filter device for capturing embolic material comprising:

a guide wire having a proximal end, a distal end and a stop near said distal end;

an expandable frame of frame struts having a closed, radially compact form and an open, radially expanded form, said frame of frame struts in said radially expanded form bent at longitudinal mid-regions thereof and forming a pair of facing frame structures;

filter material attached to one of said pair of frame structures;

said guide wire extending through said expandable frame and said guide wire being freely movable, both rotatably and longitudinally, with respect to said expandable frame except distally beyond said stop to enable said guide wire to be guided through said blood vessel;

an actuator sleeve running over said guide wire and a temporary latch at a proximal end of said actuator sleeve, said actuator sleeve enabling longitudinal compression of said expandable frame and frame struts thereby causing said frame to radially expand and deploy said filter material.

13. A filter device as claimed in claim 12 wherein said facing frame structures form substantially frustoconical frame structures and the filter material attached over said bent mid-regions of said frustoconical frame structures.

14. A filter device as claimed in claim 12 wherein said filter material has a scalloped edge about a radially large end of said one of said frame structures and said filter material is disposed on one of an inside and an outside of said one of said frame structures.

15. A filter device for capturing embolic material comprising:

a guide wire having a distal end and a proximal end;

an expansion frame having fore and aft collars connected to distal and proximal frame ends, respectively, said guide wire extending through said collars and being substantially freely movable, both rotatably and longitudinally, with respect to said collars and said expansion frame, said expansion frame having a pre-formed, centrally located transition bend region between said distal and proximal frame ends, said expansion frame having a first, radially collapsed position and a second radially open frame position in which said central transition bend delineates upstream and downstream substantially frustoconically shaped basket frames formed by said expansion frame;

filter material attached to said downstream basket frame;

an actuation sleeve disposed about said guide wire from said aft collar to said proximal end of said guide wire; and

means for longitudinally stopping said fore collar on said guide wire thereby enabling deployment of said basket frames by longitudinal compression of said expansion frame via said actuation sleeve and with respect to said guide wire;

wherein said actuation sleeve includes a temporary latch at its proximal end to enable said actuation sleeve to lock said frame in a radially open position.

16. A filter device as claimed in claim 15 wherein said bend region is substantially midway between said fore and aft collars and supports a band of material thereon.

17. A filter device as claimed in claim 16 wherein said filter material has a scalloped edge about a radially large end of said downstream basket frame and said filter material is disposed on one of an inside and an outside of said downstream basket frame.

18. A filter device as claimed in claim 15 wherein said means for stopping is one of a fixed collar having a cylindrical body and a fixed collar configured as a ring, said fore collar defines a fore end channel complementary to said fixed collar thereby enabling said expandable frame to be initially locked onto said fixed collar to deploy said filter material and then collapse said downstream basket frame about said guide wire.

19. A filter device as claimed in claim 15 wherein said filter material is furled within said basket frame prior to deployment.

20. A filter device as claimed in claim 15 wherein said filter material is attached at one of below and atop said downstream basket frame.

21. A filter device as claimed in claim 15 wherein said temporary latch includes at least one latch stop on said guide wire and an actuator piece, as part of said actuation sleeve, adapted to pass over with tactile resistence said at least one latch stop and wherein said actuator piece has indicia indicating the state of radial deployment of said expansion frame.

22. A filter device for capturing embolic material in a vascular system and running over a guide wire having a proximal end, a distal end and a stop near said distal end, said filter device comprising:

an expandable frame of frame struts having a closed, radially compact form and an open, radially expanded form, said frame of frame struts in said radially expanded form forming a pair of facing substantially frustoconically shaped frame structures, said expandable frame adapted to be movably mounted on and travel on said guide wire, said expandable frame including fore and aft collars through which is adapted to pass said guide wire, said collars permitting said free longitudinal and rotatable movement relative to said guide wire excepting said stop;

filter material attached to one of said pair of frame structures, said filter material having a scalloped edge about a radially large end of said one of said frame structures and said filter material is disposed on one of an inside and an outside of said one of said frame structures; and

said expandable frame being adapted to be freely movable over said guide wire, both rotatably and longitudinally except distally beyond said stop;

an actuator sleeve adapted to run over said guide wire, said actuator sleeve enabling longitudinal compression of said expandable frame and frame struts thereby causing said frame to radially expand and deploy said filter material;

wherein the actuator sleeve includes means for temporarily latching said sleeve and expandable frame in one of a compressed state and filter deployed state.

23. A filter device as claimed in claim 22 wherein said actuator sleeve has indicia indicating the state of radial deployment of said expandable frame.

24. A filter device for capturing embolic material in a blood vessel and running over a guide wire having a proximal end, a distal end and a stop near said distal end, said filter device comprising:

an expandable frame of frame struts having a closed, radially compact form and an open, radially expanded form, said frame of frame struts in said radially expanded form forming a pair of facing frustoconical frame structures, said expandable frame adapted to be movably mounted on and travel on said guide wire;

a filter material attached to one of said pair of frustoconical frame structures; and

said expandable frame being adapted to be freely movable over said guide wire, both rotatably and longitudinally except distally beyond said stop; and

an actuator sleeve adapted to run over said guide wire, said actuator sleeve enabling longitudinal compression of said expandable frame and frame struts thereby causing said frame to radially expand and deploy said filter material, and said actuator sleeve including means for temporarily latching said sleeve and expandable frame in a compressed state and a filter deployed state.

25. A filter device as claimed in claim 24 wherein said expandable frame includes fore and aft collars through which is adapted to pass said guide wire, said collars permitting said free longitudinal and rotatable movement relative to said guide wire excepting said stop.

26. A filter device as claimed in claim 24 wherein said filter material has a scalloped edge about a radially large end of said one of said frustoconical frame structures and said filter material is disposed on one of an inside and an outside of said one of said frustoconical frame structures.

27. A filter device as claimed in claim 24 wherein said actuator sleeve indicia indicating the state of radial deployment of said expandable frame.