Temporary vascular filter guide wire

• US 6,461,370 B1
• Filed: 12/06/1999
• Issued: 10/08/2002
• Est. Priority Date: 11/03/1998
• Status: Expired due to Term

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Gray, William, Gambale, Richard A.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US09/457,203
• Time in Patent Office: 1,037 Days
• Field of Search: 606/108, 606/127, 606/126, 606/113, 606/114, 606/91, 606/92, 606/200
• 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 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2/012 Multiple filtering units
• 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 2002/016 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 2230/0021 square
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2230/0086 Pyramidal, tetrahedral, or wedge-shaped
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2230/0097 Harpoon-shaped
• CPC Class Codes: A61M 2025/09183 having tools at the distal tip
• CPC Class Codes: A61M 25/09 Guide wires
• CPC Class Codes: Y10T 29/49604 Filter
• CPC Class Codes: Y10T 29/49801 Shaping fiber or fibered material

Abstract

A vascular filter guide wire is disclosed for directing precision placement of a cur proximate a blood vessel lesion and filtering particulate matter dislodged by treatment of the vessel. The guide wire includes an actuating mechanism, an elongated flexible core wile having a proximal end mounted to the actuating mechanism and a distal end for insertion through a vasculature to a position downstream of the restriction. A tubular flexible shaft is slidably disposed telescopically along the core wire and includes a proximal portion affixed to the actuating mechanism in movable relation to the core wire. The guide wire includes a collapsible filter at its proximal end to the distal portion of the shaft and, at its distal end, to the core wire. The filter deploys radially in response to axial moment of the core wire relative to the shaft so that it can trap particulate matter arising from treatment of the lesion.

Claims

1. A vascular filter guide wire for directing placement of a catheter with respect to a blood vessel lesion and filtering particulate matter dislodged by treatment of said vessel, said guide wire including:

an elongated flexible core wire being insertable and steerable through a patient'"'"'s vasculature to a position downstream of said lesion;

a tubular flexible shaft disposed along said core wire;

a collapsible filter being coupled at its distal end to said shaft and including a spring operable to radially extend said filter outwardly within said vasculature in order for said filter to trap particulate matter arising from the treatment of said lesion;

said core wire including a filter housing for confining said filter in a closed configuration;

an actuating mechanism operable to actuate said spring in order to radially extend said filter; and

said filter housing is formed in a frusto-conical configuration and axially disposed on said core wire, said housing including an oversized-in-diameter mouth opening axially outwardly from said wire distal end, and a reduced-in-diameter collar radially fixed to said core wire proximate said distal end.

2. A vascular filter guide wire for directing placement of a catheter with respect to a blood vessel lesion and filtering particulate matter dislodged by treatment of said vessel, said guide wire including:

an elongated flexible core wire being insertable and steerable through a patient'"'"'s vasculature to a position downstream of said lesion;

a tubular flexible shaft disposed along said core wire;

a collapsible filter being coupled at its distal end to said shaft and including a spring operable to radially extend said filter outwardly within said vasculature in order for said filter to trap particulate matter arising from the treatment of said lesion;

said core wire including a filter housing for confining said filter in a closed configuration;

an actuating mechanism operable to actuate said spring in order to radially extend said filter; and

said spring further including;

a plurality of radially spaced apart support struts defining a cage and interconnected through a woven peripheral mesh; and

a biasing element collapsibly hinged at one end along a common radial path on said shaft to bias said struts radially outwardly in an open state.

3. A vascular filter guide wire according to claim 2 wherein:

said spaced apart struts are disposed radially equidistant.

4. A vascular filter guide wire according to claim 2 wherein:

said spaced apart struts are disposed in a spiral relationship.

5. A vascular filter guide wire according to claim 2 wherein:

said struts are formed of a high elastic material.

6. A vascular filter guide wire according to claim 2 wherein:

said woven mesh comprises a polymeric material.

7. A vascular filter guide wire according to claim 2 wherein:

said woven mesh density is in the range 40 to 500 micrometers.

8. A vascular filter guide wire according to claim 2 wherein:

said biasing element comprises a quad filar spring.

9. A vascular filter guide wire for directing placement of a catheter with respect to a blood vessel lesion and filtering particulate matter dislodged by treatment of said vessel, said guide wire including:

an elongated flexible core wire having a proximal end and a distal end, said elongated flexible core wire being insertable and steerable through a patient'"'"'s vasculature to a position downstream of said lesion;

a tubular flexible shaft slidably disposed along said core wire, said shaft including a proximal portion and a distal portion disposed proximally of said core wire distal end for placement downstream of said lesion;

a collapsible filter coupled at its proximal end to said distal portion of said shaft and at its distal end to said core wire, said filter operable in response to the relative displacement between said shaft and said core wire to radially extend outwardly within said vasculature and trap particulate matter arising from the treatment of said lesion; and

a deployment/retraction mechanism including;

a base formed with a thread ed passage for confining the proximal portion of said shaft; and

a manually rotatable control element, said control element formed with a threaded hollow shank and mounted to the proximal end of said wire, said control element operable to threadably engage said passage and incrementally urge relative axial displacement between said shaft and said wire to extend and retract said filter.

10. A vascular filter guide wire for directing placement of a catheter with respect to a blood vessel lesion and filtering particulate matter dislodged by treatment of said vessel, said guide wire including:

an elongated flexible core wire having a proximal end and a distal end, said elongated flexible core wire being insertable and steerable through a patient'"'"'s vasculature to a position downstream of said lesion;

a tubular flexible shaft slidably disposed along said core wire, said shaft including a proximal portion and a distal portion disposed proximally of said core wire distal end for placement down stream of said lesion;

a collapsible filter coupled at its proximal end to said distal portion of said shaft and at its distal end to said core wire, said filter operable in response to the relative displacement between said shaft and said core wire to radially extend outwardly within said vasculature and trap particulate matter arising from the treatment of said lesion, said collapsible filter including a continuous woven mesh having a plurality of longitudinal pleats for straining particulate matter;

an d

a cylindrical support cage having a closed distal end and a flared proximal end, said distal end fixed to said core wire, and said proximal end extending axially and mounted to said shaft.

11. A vascular filter guide wire according to claim 10 wherein:

said filter is formed with oppositely disposed cone-shaped ends to define a front half and a back half.

12. A vascular filter guide wire according to claim 11 wherein:

said woven mesh is mounted to said back half.

13. A vascular filter guide wire according to claim 10 wherein:

said woven mesh comprises a material from the group including stainless steel and nickel-titanium alloy.

14. A vascular filter guide wire according to claim 10 wherein:

said wire mesh density is in the range 40 to 500 micrometers.