Method and device for filtering body fluid
First Claim
Patent Images
1. A device for filtering fluid flowing through a lumen defined by the wall of an anatomical structure comprising:
- a tubular sheath having a lumen;
a guidewire; and
a filter element carried on a distal portion of the guidewire such that the filter element is advanced through the lumen of the anatomical structure by advancing the guidewire and is retracted through the lumen of the anatomical structure by retracting the guidewire, the filter element having pores and having proximal and distal ends and being expandable from a collapsed configuration when the filter element is restrained in the lumen of the sheath to an expanded configuration when the filter element is unrestrained, the filter element in the expanded configuration having a proximally facing opening which is larger than the pores, the guidewire extending to at least the distal end of the filter element.
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Abstract
Medical devices for filtering fluids flowing through a lumen and a method of forming medical devices. The devices can be used in vascular channels, urinary tracts, biliary ducts and the like, and filter emboli and other debris generated at a treatment site.
338 Citations
29 Claims
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1. A device for filtering fluid flowing through a lumen defined by the wall of an anatomical structure comprising:
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a tubular sheath having a lumen;
a guidewire; and
a filter element carried on a distal portion of the guidewire such that the filter element is advanced through the lumen of the anatomical structure by advancing the guidewire and is retracted through the lumen of the anatomical structure by retracting the guidewire, the filter element having pores and having proximal and distal ends and being expandable from a collapsed configuration when the filter element is restrained in the lumen of the sheath to an expanded configuration when the filter element is unrestrained, the filter element in the expanded configuration having a proximally facing opening which is larger than the pores, the guidewire extending to at least the distal end of the filter element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of filtering fluid flowing through a lumen defined by the wall of an anatomical structure comprising:
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providing a tubular sheath having distal and proximal ends and a lumen;
providing a guidewire including a filter element carried on a distal portion of the guidewire, the filter element having pores and having a distal end and being expandable from a collapsed configuration when the filter element is restrained in the lumen of the sheath to an expanded configuration when the filter element is unrestrained, the filter element having a proximally facing opening which is larger than the pores when the filter element is in the expanded configuration, the guidewire extending to at least the distal end of the filter element;
introducing the guidewire into the lumen of the anatomical structure while the filter element is restrained in the collapsed configuration within the lumen of the tubular sheath;
advancing the guidewire through the lumen of the anatomical structure until the filter element is positioned at a desired location;
removing restraint on the filter element to expand the filter element to its expanded configuration;
filtering fluid flowing through the lumen of the anatomical structure into the proximally facing opening with the filter element;
substantially closing the proximally facing opening to the filter element; and
removing the guidewire and filter element from the lumen of the anatomical structure. - View Dependent Claims (21, 22, 23, 24)
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25. A method of filtering emboli from fluid flowing through a lumen defined by the wall of an anatomical structure comprising:
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providing a tubular sheath having distal and proximal ends and a lumen;
providing a guidewire including a filter element carried on a distal portion of the guidewire, the filter element having pores and having a distal end and being expandable from a collapsed configuration when the filter element is restrained in the lumen of the tubular sheath to an expanded configuration when the filter element is unrestrained, the filter element having a proximally facing opening in the expanded configuration which is larger than the pores, the guidewire extending to at least the distal end of the filter element;
introducing the guidewire into the lumen of the anatomical structure while the filter element is restrained in the collapsed configuration in the lumen of the tubular sheath;
advancing the guidewire through the lumen of the anatomical structure until the filter element is positioned at a desired location;
removing restraint on the filter element to expand the filter element to its expanded configuration;
filtering emboli from fluid flowing through the lumen of the anatomical structure with the filter element;
at least partially closing the proximally facing opening; and
removing the guidewire and filter element from the lumen of the anatomical structure after the proximally facing opening has been at least partially closed. - View Dependent Claims (26, 27, 28, 29)
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Specification