Filter device, system, and method

• US 10,010,398 B2
• Filed: 10/01/2014
• Issued: 07/03/2018
• Est. Priority Date: 10/01/2013
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Treloar, Thomas Adam, Cook, Leslie, Strader, John Tyler, Kemper, Nathan, Patterson, Don
• Primary Examiner(s): Eastwood, David C
• Application Number:
  US14/503,860
• Publication Number:
  US 20150094754A1
• Time in Patent Office: 1,371 Days
• CPC Class Codes: A61F 2/0103 With centering means
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes

Abstract

A filter device has a single hub and a plurality of filter struts extending in a first longitudinal direction. A plurality of wire loops extend in a second longitudinal direction opposite the filter struts. The filter struts and wire loops each engage the vessel wall of a body lumen when deployed. The wire loops limit the filter device from becoming tilted and embedded in the vessel wall. A retrieval device includes a sheath and a snaring mechanism. The snaring mechanism engages a hook member of the filter and the sheath envelopes the wire loops and filter struts. The sheath will cause the wire loops to bend and fold over the filter struts during retrieval such that the wire loops and filter struts extend in the same longitudinal direction after being enveloped by the sheath.

Claims

1. A filter for capturing blood clots in a body lumen, the filter comprising:

a single hub defining a longitudinal axis extending through the single hub;

a plurality of filter struts attached to the hub and extending longitudinally and radially away from the hub in a first longitudinal direction;

a plurality of wire loops attached to the hub and emerging from the hub longitudinally and radially from the hub in a second longitudinal direction opposite the first longitudinal direction, wherein each wire loop of the plurality of wire loops consists of a first end attached to the single hub, a second end, attached to the single hub, and a bent portion extending from the first end to the second end to define the wire loop, the bent portion having an outermost point forming an apex, at which the bent portion extending from the first end curves back and extends back to the second end, wherein the plurality of loops from the hub to the apices forms a generally conical shape in a deployed configuration, in which the plurality of wire loops is radially expanded, wherein each of the apices is part of the conical shape.

2. The filter of claim 1, wherein the plurality of filter struts have a delivery configuration and a deployed configuration, the plurality of filter struts are radially compressed in the delivery configuration, and the plurality of filter struts are radially expanded relative to the delivery configuration when in the deployed configuration.

3. The filter of claim 1, wherein each of the filter struts of the plurality of filter struts includes a secondary strut attached thereto.

4. The filter of claim 3, wherein the secondary strut comprises a pair of second struts.

5. The filter of claim 3, wherein the secondary strut has first and second ends each attached to the primary strut.

6. The filter of claim 3, wherein the secondary strut is disposed radially inward from the primary strut.

7. The filter of claim 1 further comprising a hook attached to the hub.

8. The filter of claim 7, wherein the hook extends in the same longitudinal direction as the plurality of wire loops.

9. The filter of claim 1, wherein the plurality of wire loops has a delivery configuration, in which the plurality of wire loops is radially compressed.

10. The filter of claim 1, wherein each wire loop of the plurality of wire loops extends between 30 and 60 degrees away from the longitudinal axis when in the deployed configuration.

11. The filter of claim 1, wherein the plurality of wire loops are made of a shape memory material.

12. The filter of claim 1, wherein each wire loop of the plurality of wire loops have a thickness of about 0.012 inches.

13. The filter of claim 1, wherein the filter is adjustable into a retrieval state, where the plurality of wire loops are folded over the plurality of filter struts such that the plurality of filter struts and the plurality of wire loops extend in the same longitudinal direction.

14. A method for retrieving a filter device from a body lumen, the method comprising:

introducing a retrieval sheath having a lumen and proximal and distal ends into a body lumen;

translating a snaring mechanism relative to the sheath in a distal direction through the lumen of the sheath;

positioning the snaring mechanism distally beyond the distal end of the sheath;

engaging the snaring mechanism with a hook member of a filter device, wherein the filter device comprises a plurality of filter struts extending from a first end of a single hub in a first longitudinal direction and a plurality of wire loops emerging from a second end of the single hub, which is opposite the first end, in a second longitudinal direction opposite the first longitudinal direction and forming a generally conical shape when the filter device is in a deployed configuration, wherein each wire loop of the plurality of wire loops consists of a first end attached to the single hub, a second end, attached to the single hub, and a bent portion extending from the first end to the second end to define the wire loop;

translating the retrieval sheath relative to the filter device and the snaring mechanism to load the filter device and the snaring mechanism into the retrieval sheath lumen,

engaging the plurality of wire loops with the retrieval sheath, folding the plurality of wire loops over the plurality of filter struts such that the plurality or wire loops and the plurality of filter struts extend in the first longitudinal direction, and receiving the plurality of wire loops and the plurality of filter struts within the retrieval sheath lumen.

15. The method of claim 14, further comprising translating the snaring mechanism toward the hook member, wherein the snaring mechanism is disposed radially within the plurality of wire loops.