US20040073198A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Embolic protection device
Assignee: Salviac Ltd
•
Filing: 2003-03-26
•
Granted: —
•
Expires: 2023-03-26
Abstract
Abstract An embolic protection device has a collapsible filter element ( 105 ) mounted on a carrier such as a guidewire ( 101 ). The filter element ( 105 ) collapses into the outer end of a catheter ( 118 ) for deployment and retrieval through a vascular system of a patient. The filter element ( 105 ) has a collapsible filter body with a proximal inlet end and a distal outlet end. The proximal inlet end has inlet openings sized to allow blood and embolic material enter the filter body. The outlet end has outlet openings which allow through passage of blood but retain embolic material within the filter body. After use, the catheter ( 118 ) is movable along the guidewire ( 101 ) to engage the proximal end of the filter element and close the inlet openings before sliding over the filter element from the proximal end to the distal end to progressively collapse the filter body on the guidewire ( 101 ) for retrieval. The filter element ( 105 ) may conveniently be mounted on a tubular sleeve ( 104 ) which is slidable and rotatable on the guidewire ( 101 ) between spaced-apart stops ( 106, 120 ) on the guidewire ( 101 ) which allows some manipulation of the guidewire independently of the filter when the filter is in use.
Inventors
- 👤 Paul Gilson
- 👤 Eamon Brady
- 👤 Padraig Maher
- 👤 David Vale
- 👤 Charles Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:07
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/01; A61F2/0108; A61F2/013; A61B; A61B17/00; A61B17/22; A61B2017/22051; A61B2017/22065; A61B2017/22067; A61F2/011; A61F2002/015; A61F2002/016; A61F2002/018; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0063; A61F2230/0067; A61F2230/0069; A61F2230/0093; A61F2230/0097
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
162 words
1 . An embolic protection device comprising: a collapsible filter element mounted on a filter carrier for delivery through a vascular system of a patient, the filter element being movable between a collapsed stored position against the filter carrier for movement through the vascular system, and an expanded position for occluding a blood vessel such that blood passing through the blood vessel is delivered through the filter element, the filter element comprising a collapsible filter body having an inlet end and an outlet end, the inlet end of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body, the outlet end of the filter body having a plurality of outlet openings sized to allow through passage of blood but to retain undesired embolic material within the filter body, means for closing the inlet openings at the inlet end of the filter body, and means for collapsing the filter body on the support.
Claim 2
Dependent Claim
162 words
1 . An embolic protection device comprising: a collapsible filter element mounted on a filter carrier for delivery through a vascular system of a patient, the filter element being movable between a collapsed stored position against the filter carrier for movement through the vascular system, and an expanded position for occluding a blood vessel such that blood passing through the blood vessel is delivered through the filter element, the filter element comprising a collapsible filter body having an inlet end and an outlet end, the inlet end of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body, the outlet end of the filter body having a plurality of outlet openings sized to allow through passage of blood but to retain undesired embolic material within the filter body, means for closing the inlet openings at the inlet end of the filter body, and means for collapsing the filter body on the support.
Claim 3
Dependent Claim
88 words
2 . A device as claimed in claim 1 , wherein the means for closing the inlet openings comprises:— a tubular filter retrieval device having an open distal end for reception of the filter element, said distal end being engagable with a proximal inlet end of the filter body to close the inlet openings and being slidable over the filter body from the inlet end to the outlet end to progressively collapse the filter body on the filter carrier and receive the filter body within the retrieval device.
Claim 4
Dependent Claim
45 words
3 . A device as claimed in claim 1 wherein the collapsible filter element is slidably mounted on the filter carrier between a pair of spaced-apart stops on the filter carrier for axial movement of the filter element along the filter carrier between the stops.
Claim 5
Dependent Claim
21 words
4 . A device as claimed in claim 3 , wherein the filter element is rotatably mounted on the filter carrier.
Claim 6
Dependent Claim
44 words
5 . A device as claimed in claim 3 , wherein a sleeve is slidably mounted on the filter carrier between the stops, the length of the sleeve being less than the distance between the stops, the filter element being mounted on the sleeve.
Claim 7
Dependent Claim
54 words
6 . A device as claimed in claim 1 , wherein the filter element comprises:— a collapsible filter net mounted on the filter carrier, the filter net being movable between a collapsed stored position against the filter carrier and an expanded position extending outwardly of the filter carrier for deployment across a blood vessel
Claim 8
Dependent Claim
40 words
7 . A device as claimed in claim 2 , wherein the tubular filter retrieval device comprises a catheter slidable along the filter carrier, an open distal end of the catheter forming a housing for reception of the filter element.
Claim 9
Dependent Claim
40 words
8 . A device as claimed in claim 1 , wherein a proximal inlet end of the filter body is fixed to the filter carrier and a distal end of the filter body is slidably mounted on the filter carrier.
Claim 10
Dependent Claim
48 words
9 . A device as claimed in claims 1 wherein a filter support frame is mounted on the filter carrier, the support frame being movable between a collapsed position along the filter carrier and an extended outwardly projecting position to support the filter body in the expanded position.
Claim 11
Dependent Claim
46 words
10 . A device as claimed in claim 9 wherein the filter support frame is fixed on the filter carrier at a proximal end of the filter body, and the filter support frame slidably engages the filter carrier at a distal end of the filter body.
Claim 12
Dependent Claim
21 words
11 . A device as claimed in claim 9 wherein the filter support frame is biased into a normally extended position.
Claim 13
Dependent Claim
26 words
12 . A device as claimed in claim 9 wherein a circumferential groove is provided in the filter body intermediate the ends of the filter body.
Claim 14
Dependent Claim
72 words
13 . A device as claimed in claim 1 , wherein a guide olive is provided on the filter carrier distally of the filter body, the guide olive having a cylindrical body with a tapered distal end, the cylindrical body being engagable within a distal end of a deployment catheter, said tapered distal end projecting outwardly of the deployment catheter to provide a smooth transition between the catheter and the filter carrier.
Claim 15
Dependent Claim
26 words
14 . A device as claimed in claim 1 wherein the filter element includes storage means to store captured undesired embolic material in the filter element.
Claim 16
Dependent Claim
21 words
15 . A device as claimed in claim 14 wherein the storage means comprises additional storage pathways within the filter element.
Claim 17
Dependent Claim
18 words
16 . A device as claimed in claim 1 wherein the filter element defines a three dimensional matrix.
Claim 18
Dependent Claim
19 words
17 . A device as claimed in claim 16 wherein the filter element is of a polymeric porous structure.
Claim 19
Dependent Claim
30 words
18 . A device as claimed in claim 16 wherein the matrix comprises a porous structure dimensioned to entrap embolic material ranging in size from 100 microns to 3500 microns.
Claim 20
Dependent Claim
42 words
19 . A device as claimed in claim 1 wherein the filter element has a distal end which is tapered such that there is a smooth transition in lateral stiffness to improve the manoeuvrability of the filter element in the vascular system.
Claim 21
Dependent Claim
27 words
20 . A device as claimed in claim 1 wherein the filter element has a soft distal portion to aid in atraumatic transport through the vascular system.
Claim 22
Dependent Claim
25 words
21 . A device as claimed in claim 1 wherein the filter element has a tapered proximal end to facilitate retrieval by a removal catheter.
Claim 23
Dependent Claim
32 words
22 . A device as claimed in claim 1 wherein the filter element has inlet holes that close on pulling back into a retrieval catheter to ensure retention of any collected emboli.
Claim 24
Dependent Claim
18 words
23 . A device as claimed claim 1 having means for placing the device over a medical guidewire.
Claim 25
Dependent Claim
20 words
24 . A device as claimed in claim 23 which may be placed under a balloon or stent delivery catheter.
Claim 26
Dependent Claim
48 words
25 . A device as claimed in any preceding claim including a delivery catheter in which an external sheath is engagable with the filter element or filter carrier to provide push during delivery and is removable to allow maximum space in the vascular cross-section during an interventional procedure.
Claim 27
Dependent Claim
26 words
26 . A device as claimed in claim 25 wherein the external sheath is joined to the filter element or filter carrier by a joining means.
Claim 28
Dependent Claim
33 words
27 . A device as claimed in claim 25 wherein the delivery catheter has a central lumen for at least part of it's length to allow ft to track over a steerable guidewire.
Claim 29
Dependent Claim
37 words
28 . A device as claimed in claim 25 , wherein the external sheath is sufficiently long to extend to the outside of the vasculature and is removable proximally to release the filter element from the catheter.
Claim 30
Dependent Claim
30 words
29 . A device as claimed in claim 25 , wherein the delivery catheter has an external covering which extends beyond the push element to define a filter retention sleeve.
Claim 31
Dependent Claim
46 words
30 . A device as claimed in claim 1 wherein the filter element is mounted on a collapsible support frame which is movable between a collapsed position for deployment and an extended in-use position, means being provided for retaining the support structure in the collapsed position.
Claim 32
Dependent Claim
23 words
31 . A device as claimed in claim 30 wherein the support frame is formed from a shape memory or elastic memory material.
Claim 33
Dependent Claim
33 words
32 . A device as claimed in claim 1 wherein the filter element has an associated support structure with a pre-shaped spiral arrangement such that it provides radial support to the filter element.
Claim 34
Dependent Claim
29 words
33 . A device as claimed in claim 1 wherein the filter has a support structure adapted to fold into the collapsed position when pulled into a retrieval catheter.
Claim 35
Dependent Claim
19 words
34 . A device as claimed in claim 1 wherein the filter element comprises a flexible shaped polymeric component.
Claim 36
Dependent Claim
33 words
35 . A device as claimed in claim 1 wherein the filter element is directly bonded onto a steerable medical guide wire incorporating a slidable sheath that is movable to deploy the filter.
Claim 37
Dependent Claim
37 words
36 . A device as claimed in claim 1 incorporating a medical guidewire with a flexible segment of wire distal to the filter so as to provide steerability of the wire particularly prior to it being deployed.
Claim 38
Dependent Claim
30 words
37 . A device as claimed in claim 1 incorporating a medical guide wire with a soft distal segment so as to provide a tip section that will be atraumatic.
Claim 39
Dependent Claim
49 words
38 . A device as claimed in claim 1 having a filter element which permits the incorporation of a medical guide wire in or near the outer wall of the filter element to facilitate the incorporation of large inlet holes on the proximal inlet end of the filter element.
Claim 40
Dependent Claim
64 words
39 . A device as claimed in claim 1 wherein the filter element comprises a mesh work structure with large proximal inlet holes and small distal outlet holes wherein the mesh structure is collapsible into a small diameter delivery catheter and is expandable upon deployment to a shape which is remembered by the mesh structure either through shape memory characteristics or elastic memory characteristics.
Claim 41
Dependent Claim
18 words
40 . A device as claimed in claim 1 wherein the filter element comprises a braided fibrous meshwork.
Claim 42
Dependent Claim
35 words
41 . A filter retrieval system for use with the device as claimed in any preceding claim comprising a longitudinal catheter with a deformable tip to assist the pull back of the filter into it.
Claim 43
Dependent Claim
197 words
42 . A method for the capture and removal of embolic material from a blood vessel during an interventional procedure comprising the steps: preparing an embolic protection device comprising a guidewire having a proximal end and a distal end, a collapsible filter element mounted adjacent the distal end of the guidewire, the filter element being movable between a collapsed stored position against the guidewire and an expanded position extending laterally outwardly of the guidewire, sliding a catheter along the guidewire and over the filter element from a proximal inlet end of the filter to collapse and house the filter in a distal end of the catheter, introducing the distal end of the catheter into the vascular system of a patient, positioning the distal end at a desired location in the blood vessel, holding the guidewire and retracting the catheter to release the filter element from the catheter into the expanded position, filtering blood in the vessel during the interventional procedure, after the interventional procedure advancing a retrieval catheter along the guidewire to engage a proximal inlet end of the filter, collapsing the filter into the distal and of the catheter, and withdrawing the catheter from the patient.
Claim 44
Dependent Claim
197 words
42 . A method for the capture and removal of embolic material from a blood vessel during an interventional procedure comprising the steps: preparing an embolic protection device comprising a guidewire having a proximal end and a distal end, a collapsible filter element mounted adjacent the distal end of the guidewire, the filter element being movable between a collapsed stored position against the guidewire and an expanded position extending laterally outwardly of the guidewire, sliding a catheter along the guidewire and over the filter element from a proximal inlet end of the filter to collapse and house the filter in a distal end of the catheter, introducing the distal end of the catheter into the vascular system of a patient, positioning the distal end at a desired location in the blood vessel, holding the guidewire and retracting the catheter to release the filter element from the catheter into the expanded position, filtering blood in the vessel during the interventional procedure, after the interventional procedure advancing a retrieval catheter along the guidewire to engage a proximal inlet end of the filter, collapsing the filter into the distal and of the catheter, and withdrawing the catheter from the patient.
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