Locking frame, filter and deployment system

• US 6,537,296 B2
• Filed: 06/06/2001
• Issued: 03/25/2003
• Est. Priority Date: 04/01/1999
• Status: Expired due to Fees

• Current Assignee: Scion Cardio-Vascular
• Original Assignee: Scion Cardio-Vascular Incorporated
• Inventors: Palmer, Matthew A., Levinson, Melvin E., Golik, George I.
• Primary Examiner(s): Dawson, Glenn K.
• Application Number:
  US09/875,342
• Publication Number:
  US 20010041908A1
• Time in Patent Office: 657 Days
• Field of Search: 606/159, 606/167, 606/171, 606/180, 606/191-200, 606/213, 606/151, 600/434, 600/585, 604/96-1-1
• 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: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• 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 controllable deployment system for a radially expandable frame utilized during catheterization includes a guide wire with a stop, a radially expandable frame through which the guide wire freely passes, an elongated actuation sleeve over the guide wire, and a friction locking mechanism located at the proximal end of the system. The expandable frame has a closed, radially compact form and an open, radially expanded form. The proximal end of the frame is coupled to an actuator sleeve. The actuator sleeve, at its proximal end, includes a friction locking mechanism having locking members with respective locking surfaces. The locking mechanism permits the user to lock or hold static the actuator sleeve (and therefore, the expandable frame) with respect to the guide wire, typically in an open, radially expanded form and a closed form. Tactile markers or indicia may be included.

Claims

1. A filter device for capturing embolic material in a blood vessel 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 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 mains for temporarily latching said sleeve and expandable frame in one of a compressed state and a filter deployed state.

2. A filter device as claimed in claim 1 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.

3. A filter device as claimed in claim 1 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.

4. A filter device as claimed in claim 1 wherein said actuator sleeve has indicia indicating the state of radial deployment of said expandable frame.

5. A controllable deployment system for a radially expandable frame utilized during catheterization comprising:

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

a radially expandable frame having a closed, radially compact, elongated form and an open, radially expanded, longitudinally foreshortened form, said frame having distal and proximal frame ends;

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

an elongated actuation sleeve having a distal end, a proximal end, and a lumen through which passes said guide wire, said distal sleeve end coupled to said proximal frame end;

a locking mechanism having a first locking member with a radially inboard locking surface disposed on said actuator sleeve at said proximal end, and a second locking member with a radially outboard locking surface disposed on said guide wire at said proximal end, said locking members respectively positioned on said actuator sleeve and said guide wire such that said locking surfaces establish a friction locking interface during one of radial expansion or radial closure of said expandable frame.

6. A system as claimed in claim 5 wherein said radially inboard locking surface includes a radially inboard friction face;

said radially outboard locking surface includes a radially outboard friction face; and

said radially inboard friction face and said radially outboard friction face being substantially contiguous during said radial expansion or radial closure of said expandable frame.

7. A system as claimed in claim 5 wherein said radially inboard locking surface includes a radially inboard sloping face, said radially outboard locking surface includes a radially outboard sloping face, and said radially sloping faces being substantially contiguous during said radial expansion or radial closure of said expandable frame.

8. A system as claimed in claim 5 wherein said locking mechanism establishes a friction lock during both said radial expansion and said radial closure of said expandable frame, and wherein said radially inboard locking surface includes a first radially inboard friction face and a second radially inboard friction face;

said radially outboard locking surface includes a first radially outboard friction face and a second radially outboard friction face;

said first radially inboard friction face and said first radially outboard friction face being substantially contiguous to establish a first friction locking interface during said radial expansion of said expandable frame; and

said second radially inboard friction face and said second radially outboard friction face being substantially contiguous to establish a second friction locking interface during said radial closure of said expandable frame.

9. A system as claimed in claim 8 wherein said first and second radially inboard friction faces and said first and second radially outboard friction faces define corresponding sloping faces.

10. A system as claimed in claim 9 wherein said actuation sleeve is a two-part actuation sleeve detachably coupled together with a coupling located at said proximal end of said actuation sleeve.

11. A system as claimed in claim 10 wherein said guide wire is a two-part guide wire detachably coupled together with a coupling located at said proximal end of said guide wire.

12. A system as claimed in claim 11 wherein said actuation sleeve coupling and said guide wire coupling are one of a threaded interface and a detent.

13. A system as claimed in claim 12 wherein said actuation sleeve coupling and said guide wire coupling are located at a distal position with respect to said locking mechanism.

14. A system as claimed in claim 12 wherein said actuation sleeve coupling is located between said first radially inboard friction face and said second radially inboard friction face of said locking mechanism, and said guide wire coupling is located between said first radially outboard friction face and said second radially outboard friction face of said locking mechanism.

15. A system as claimed in claim 14 wherein said locking mechanism is capable of locking said actuator sleeve and said guide wire together such that said expandable frame is one of radially closed or radially open after said actuation sleeve coupling and said guide wire coupling are detached.

16. A system as claimed in claim 15 wherein said proximal sleeve end and said proximal guide wire end have at least one tactile responsive interface indicative of at least one of a radial deployment of said expandable frame and a longitudinal position of said frame with respect to said distal stop.

17. A system as claimed in claim 16 wherein said actuation sleeve includes visual indicia on said proximal sleeve end, said indicia indicative of radial deployment position of said frame.

18. A system as claimed in claim 5 wherein said proximal sleeve end and said proximal guide wire end have at least one tactile responsive interface indicative of at least one of a radial deployment of said expandable frame and a longitudinal position of said frame with respect to said distal stop.

19. A system as claimed in claim 18 wherein said proximal sleeve end is slotted and said guide wire carries a temporary stop which, upon cooperation with said slotted sleeve end, forms said at least one tactile responsive interface.

20. A system as claimed in claim 19 including a plurality of tactile responsive interfaces formed as a plurality of temporary stops on said guide wire which act in cooperation with said slotted sleeve end.

21. A system as claimed in claim 20 including visual indicia on said slotted sleeve end, said indicia indicative of at least one of a plurality of radial deployment positions of said frame and a plurality of longitudinal distances of said frame with respect to said distal stop.

22. A system as claimed in claim 21 wherein said actuation sleeve includes visual indicia on said proximal sleeve end, said indicia indicative of radial deployment position of said frame.

23. A system as claimed in claim 5 wherein said actuation sleeve includes visual indicia on said proximal sleeve end, said indicia indicative of radial deployment position of said frame.