US 9,308,074 B2 · Filter retrieval device

Abstract

A device for inferior retrieval of a vena cava filter includes an outer sheath with a first radial window closer to the distal end than the proximal end of the outer catheter; an inner sheath generally extending movably inside the lumen of the outer sheath and having a second radial window; and a snare tool having an elongated guide element extending through the inner sheath and a snare loop distally attached to the guide element. The snare loop is extendable outward through the two radial windows.

Drawings

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Drawings

Claims20

Dependent claims

A device for inferior retrieval of a vena cava filter, the device comprising:

an outer sheath with a first lumen longitudinally extending from a first proximal end to a first distal end, the outer sheath having a first radial window between the first proximal end and the first distal end, the first radial window being closer to the first distal end than the first proximal end;
an inner sheath generally extending movably inside the lumen of the outer sheath, the inner sheath having a lumen extending from a second proximal end to a second distal end, the inner sheath forming an opening being a second radial window between the second proximal end and the second distal end, the second radial window being closer to the second distal end than the second proximal end, the second radial window formed by an edge with a flared edge portion that extends at least across a distal portion of the edge, the flared edge portion being flexible such that it can deform to fit within the first lumen of the outer sheath, the flared edge portion protrudes outward from the first radial window when the flared edge portion resides in a longitudinal and angular position within the first radial window;
and
a snare tool having an elongated guide element extending through the inner sheath and a snare distally attached to the guide element, the snare extendable outward from the second radial window in the inner sheath and outward through the first radial window in the outer sheath.

1 more element

A method of removing an implantable device having proximally extending radially collapsible struts, a distal hub and a removal hook distally attached to the hub, the method comprising the steps of:

providing an outer sheath with a first lumen longitudinally extending from a first proximal end to a first distal end, the outer sheath having a first radial window between the first proximal end and the first distal end, the first radial window being closer to the first distal end than the first proximal end;
providing an inner sheath generally extending inside the lumen of the outer sheath, the inner sheath having a lumen extending from a second proximal end to a second distal end, the inner sheath forming a second radial window between the second proximal end and the second distal end, the second radial window being closer to the second distal end than the second proximal end, the second radial window formed by an edge with a flared edge portion that extends at least across a distal portion of the edge, the flared edge portion being flexible such that it can deform to fit within the first lumen of the outer sheath, the flared edge portion protrudes outward from the first radial window when the flared edge portion resides in a longitudinal and angular position within the first radial window;
and
providing a snare tool having an elongated guide element extending through the inner sheath and a snare loop distally attached to the guide element;
advancing the outer sheath, the inner sheath and the snare tool distally past the removal hook of the implantable device until the first radial window is positioned distally from the implantable device;
aligning the first and second radial windows to obtain an overlap with each other;
extending the snare loop outward through the first and second radial windows;
engaging the removal hook with the snare loop;
distally moving the snare tool relative to the outer and inner sheaths so as to distally pull the implantable device into the inner sheath until the proximally extending radially collapsible struts are substantially accommodated within the inner sheath;
moving the inner sheath relative to the outer sheath until the overlap between the first radial window and the second radial window is substantially reduced;
and
proximally withdrawing the outer sheath along with the inner sheath, the snare tool and the implantable device.

9 more elements

Dependencies are inferred from the claim text.

Description4,407 words

Summary1,193 words

#The present invention generally relates to a removal device for retrieving an implanted collapsible filter. In particular, the present invention relates to a removal device for inferior removal of an implanted vena cava filter with a superior removal hook and inferior struts.

#Certain implantable devices, in particular umbrella-like filters or filters with a hub and a plurality of struts extending thereof are designed to be collapsed and removed only from the end with the hub. For a vena cava filter, for example, the typical removal method thus involves approaching the filter from the superior side. A snare may be used to engage the removal hook and to pull the hub into an axial end of a catheter or tube until the inferior struts are collapsed and accommodated in the catheter or tube. Subsequently, the catheter or tube is withdrawn with the filter inside.

#There may, however, be situations, in which it is desirable to remove an implanted filter or collapsible device, but the typical method of removal of the device is impossible or not desired.

Brief description of the drawings10 figures

#In the drawings,

#FIG. 1 shows a device for inferior filter retrieval with a snare loop engaging a removal hook of a vena cava filter according to one embodiment of the invention;

#FIG. 2 shows the inferior filter retrieval device of FIG. 1 in the process of pulling the vena cava filter into an inner sheath of the removal device;

Detailed description2,963 words

#The included drawings are provided for purely illustrative purposes and are not intended to limit the scope of the invention. While the following description is provided by a specific example of a vascular filter for implantation in a blood vessel, the present invention is not limited to vascular applications or specific filters and is applicable to collapsible implantable devices designed for collapsing from one side but not the other.

#Now referring to FIGS. 1 and 6, a inferior filter retrieval device 100 comprises an outer sheath 102, and inner sheath 104, and a snare tool 106, of which an elongated guide member 108 extends through the inner sheath 104 and a snare loop 110 is visible in FIG. 1.

#In the embodiment shown in the drawing, the outer sheath 102 has an outer diameter of about 5 mm, and the inner sheath has an outer diameter of about 4 mm. The inner sheath 104 has an interior diameter of about 3 mm. These dimensions are variable, depending on the specific application as will be explained below in greater detail.

Facts

Application

13/693,175Filed 4 Dec 2012

Published

US 2014/0155930 A15 Jun 2014

Granted

12 Apr 2016

Term ends

9 Jun 2033

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 187 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification8 codes

A61F 2/011
Filters implantable into blood vessels: instruments for their placement or removal
A61F 2/0105
Filters implantable into blood vessels: open ended, i.e. legs gathered only at one side
A61B 2017/00358
For minimally invasive surgery: snares for grasping
A61B 2017/22035
Gripping instruments, e.g. forceps, for removing or smashing calculi: for retrieving or repositioning foreign objects

Timeline

4 Dec 2012Application filedUS 13/693,175
4 Dec 2012Assigned to Cook Incorporatedassignment of assignor's interest
4 Dec 2012Assigned to Cook Medical Technologies LLCassignment of assignor's interest
7 Feb 2013Assigned to Cook Incorporatedassignment of assignor's interest
7 Feb 2013Assigned to Cook Medical Technologies LLCassignment of assignor's interest
5 Jun 2014PublishedUS 2014/0155930 A1
12 Apr 2016GrantedUS 9,308,074 B2
28 Feb 2024Assigned to Wilmington Trust, National Association, AS Collateral Agentsecurity interest
12 Oct 2026TodayWithin its term
9 Jun 2033Term endsEstimated, includes 187 days of adjustment

Filter retrieval device

Life of this patent

Filter retrieval device

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims20

Description4,407 words

Drawings

Classification8 codes

Life of this patent

Description4,407 words