Collapsible blood filter with optimal braid geometry
First Claim
1. A collapsible blood filter for capturing emboli during an endovascular procedure at a treatment site, the filter comprising a tube formed by braided filaments that define pores, the filter having at least one inlet opening that is substantially larger than the pores, the filter having an axis and tapered ends, wherein relative movement of the ends along the axis accompanies transformation of the filter between a collapsed configuration and a deployed configuration, and wherein the pore-defining filaments of the braided tube form a maximum included angle of about 90 degrees, as measured across the axis when the filter is in the deployed configuration.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention is a collapsible blood filter for use during a vascular procedure, such as angioplasty or stent deployment. A filter made of braided filaments is located on the distal end of a delivery member, and the filter is deployed downstream of the vascular treatment site to capture emboli released during and immediately after the procedure. Optimal braid geometry of the filter ensures that captured emboli will be retained during collapse and removal of the filter following the procedure.
-
Citations
18 Claims
- 1. A collapsible blood filter for capturing emboli during an endovascular procedure at a treatment site, the filter comprising a tube formed by braided filaments that define pores, the filter having at least one inlet opening that is substantially larger than the pores, the filter having an axis and tapered ends, wherein relative movement of the ends along the axis accompanies transformation of the filter between a collapsed configuration and a deployed configuration, and wherein the pore-defining filaments of the braided tube form a maximum included angle of about 90 degrees, as measured across the axis when the filter is in the deployed configuration.
-
6. A distal protection device for capturing emboli during an endovascular procedure at a treatment site, the device comprising:
-
a delivery member having a proximal end and a distal end; and
a collapsible filter adjacent the distal end of the delivery member, the filter comprising a tube formed by braided filaments that define pores, the filter having at least one inlet opening that is substantially larger than the pores, the filter having an axis and tapered ends, wherein relative movement of the ends along the axis accompanies transformation of the filter between a collapsed configuration and a deployed configuration, and wherein the pore-defining filaments of the braided tube form a maximum included angle of about 90 degrees, as measured across the axis when the filter is in the deployed configuration. - View Dependent Claims (7, 8, 9)
a sheath being slidingly moveable over at least part of the filter for transforming the filter between the deployed configuration and the collapsed configuration.
-
-
8. The distal protection device of claim 6 wherein the deployed configuration is sized to fill a selected cross-sectional area distal to the treatment site.
-
9. The distal protection device of claim 6 wherein at least one of the braid filaments is a wire comprising radiopaque metal.
-
10. A system for treating a vascular stenosis, comprising:
-
an elongate delivery member having proximal and distal ends;
a collapsible filter mounted adjacent the distal end of the delivery member, the filter having a tube formed by braided filaments that define pores, the filter having at least one inlet opening that is substantially larger than the pores, the filter having an axis and tapered ends, wherein relative movement of the ends along the axis accompanies a transformation of the filter between a collapsed configuration and a deployed configuration, and wherein the pore-defining filaments of the braided tube form a maximum included angle of about 90 degrees, as measured across the axis when the filter is in the deployed configuration; and
a vascular treatment catheter capable of being slidably disposed about the delivery member. - View Dependent Claims (11, 12, 13)
-
-
14. A method of making a collapsible blood filter, the method comprising:
-
braiding wire-like filaments to form a tubular filter having pores therein, the filter having an axis, a deployed diameter and two ends, the filaments intersecting at a maximum angle of about 90 degrees, as measured across the axis when the filter is at the deployed diameter;
forming tapered ends on the filter by drawing the ends to a second diameter that is significantly smaller than the deployed diameter; and
heat treating the filter to fix a selected shape thereof. - View Dependent Claims (15, 16, 17, 18)
forming at least one inlet opening in a tapered end of the filter, the opening having a selected size and shape that is substantially larger than the pores by forcing a mandrel of the selected size and shape into a pore formed by the braided filaments.
-
-
16. The method of making a blood filter according to claim 14, wherein the braiding step further includes braiding a distal portion of the filter body more tightly than the remainder of the body.
-
17. The method of making a blood filter according to claim 14, wherein the wire-like filaments comprise shape-memory metal wires.
-
18. The method of making a blood filter according to claim 14, wherein at least one of the wire-like filaments is a wire comprising radiopaque metal.
Specification