Embolic filter

Patent metadata

Field	Value
Publication number	US-2023000611-A1
Application number	US-202217849997-A
Country	US
Kind code	A1
Filing date	Jun 27, 2022
Priority date	Jul 1, 2021
Publication date	Jan 5, 2023
Grant date	—

Abstract

An embolic filter is provided with a support frame and a porous polymeric membrane connected to the support frame. The embolic filter is configured to be movable between a collapsed state and a deployed state where the filter extends, in use, into contact with an inner wall of a patient's vasculature. The support frame of the embolic filter includes a shape memory material such that the support frame acts as a deployment arrangement to move the embolic filter from the collapsed state into the deployed state.

First claim

1 . An embolic filter comprising:
a support frame; and a porous polymeric membrane connected to the support frame, wherein the embolic filter is configured to be movable between a collapsed state and a deployed state where the filter extends, in use, into contact with an inner wall of a patient's vasculature, wherein the support frame comprises a shape memory material such that the support frame acts as a deployment arrangement to move the embolic filter from the collapsed state into the deployed state.

2 . An embolic filter according to claim 1 , wherein the support frame comprised nitinol.

3 . An embolic filter according to claim 1 , wherein the embolic filter comprises a neck portion configured to conform to an external surface of a catheter body, in use.

4 . An embolic filter according to claim 3 , wherein the support frame comprises the neck portion and a plurality of flexible petals extend from said neck portion, and wherein a distal end of each of the flexible petals are configured, in use, to contact with an inner wall of a patient's vasculature when in the deployed state.

5 . An embolic filter according to claim 3 , further comprising an internal leaflet extending across an interior of the support frame and configured and arranged to define the neck portion.

6 . An embolic filter according to claim 3 , wherein the embolic filter defines an inlet region at an upstream end of the embolic filter that is covered with the porous polymeric membrane, and wherein said inlet region tapers towards the neck portion so as to define a substantially conical inlet region.

7 . An embolic filter according to claims 3 , wherein the support frame comprises a nitinol tube or ring configured, in use, to contact with an inner wall of a patient's vasculature when in the deployed state, wherein a first end or region of the porous polymeric membrane is attachable to a body of a delivery catheter, in use, and a second end or region of the porous polymeric membrane is attached to the support frame such that the porous polymeric membrane forms an inlet region which tapers towards the first end or region of the porous polymeric membrane to define the inlet region which tapers towards the neck portion.

8 . An embolic filter according to claim 1 , wherein the support frame defines an elongate body comprising first and second end regions thereof, each region configured, in use, to contact with an inner wall of a patient's vasculature when in the deployed state.

9 . An embolic filter according to claim 8 , wherein the elongate body comprises an external surface, said external surface comprising a narrower region between the first and second end regions.

10 . An embolic filter according to claim 1 , wherein a first end or region of the porous polymeric membrane is attachable to a body of a delivery catheter, in use, and wherein a second end or region of the membrane is attached to the support frame, wherein the support frame comprises a ring, a coil or an arm configured to extend at least partially around a body of a delivery catheter, in use, over which the porous polymeric membrane extends.

11 . An embolic filter according to claim 1 , wherein the support frame is formed from an elongate tubular braided nitinol mesh connectable to a body of a delivery catheter, in use, and defining an internal volume.

12 . An embolic filter according to claim 11 , wherein the porous polymeric membrane is positioned in the internal volume of the elongate braised nitinol mesh, and wherein the porous polymeric membrane is arranged to cover the braised nitinol mesh at a first, upstream, end region thereof and is connected to said braided nitinol mesh at a second, downstream, end region thereof.

13 . An embolic filter according to claim 12 , wherein the porous polymeric membrane comprises an elongate length that is greater than the elongate length of the braised nitinol mesh.

14 . An embolic filter according to claim 1 , wherein the porous polymeric membrane ( 40 , 78 ) is a biocompatible fabric comprising a pore size of between 100 and 200 nanometers.

15 . An embolic filter assembly comprising:
a delivery catheter including a replacement valve; and an embolic filter integrated with the delivery catheter, wherein the embolic filter is deployable from the delivery catheter prior to the delivery of the replacement valve and retrievable to the delivery catheter after delivery of the replacement valve, wherein the filter is retained in the collapsed state by an overlying sleeve.

Assignees

• Medtronic Inc

Inventors

• Fraysse Estelle
• Kleijnen Patrick
• Van Der Knaap Niels

Classifications

• A61F2002/018

  made from tubes or sheets of material, e.g. by etching or laser-cutting · CPC title

• A61F2/012

  Multiple filtering units · CPC title

• A61F2/011

  Instruments for their placement or removal · CPC title

• A61F2/013 Primary

  Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting · CPC title

• A61F2210/0014

  using shape memory or superelastic materials, e.g. nitinol · CPC title