Medical device for treating a heart valve insufficiency or stenosis

摘要

A medical device for treating a heart valve insufficiency, with an endoprosthesis which can be introduced into a patient's body and expanded to secure a heart valve prosthesis in the patient's aorta with a catheter. In an embodiment, the endoprosthesis has a plurality of positioning arches configured to be positioned with respect to a patient's aorta and a plurality of retaining arches to support a heart valve prosthesis. The endoprosthesis includes a collapsed mode during the process of introducing it into the patient's body and an expanded mode when it is implanted. The endoprosthesis may be introduced into a patient's body and expanded via a catheter. In an embodiment, the catheter has first and second slide mechanisms configured to independently manipulate first and second sleeve elements to sequentially expand the endoprosthesis from the collapsed mode to the expanded mode.

主权项

1. A catheter system comprising:
an endoprosthesis comprising:
a first portion including a plurality of retaining arches, each retaining arch including a first apex;a second portion including a plurality of positioning arches, each positioning arch including a second apex axially aligned with one of the first apices, the first apices and the second apices pointing in a same direction;a third portion including a plurality of retaining elements; anda heart valve prosthesis directly attached to the plurality of retaining arches; and a catheter configured to releasably retain the endoprosthesis in a collapsed state and sequentially release the endoprosthesis from the collapsed state to an expanded state, the catheter comprising:
a first housing portion for accommodating the first portion of the endoprosthesis;a second housing portion for accommodating the second portion of the endoprosthesis;a retaining mechanism defining a plurality of pockets formed therein for receiving the plurality of retaining elements of the endoprosthesis; anda handle configured to control movement of each of the first housing portion and the second housing portion with respect to the handle;wherein the first housing portion and the second housing portion are arranged relative to one another such that movement of the second housing portion in a first direction relative to the endoprosthesis, before movement of the first housing portion relative to the endoprosthesis, uncovers the second portion of the endoprosthesis from the catheter while the first portion of the endoprosthesis is accommodated within the first housing portion and the plurality of retaining elements of the endoprosthesis remains engaged with the plurality of pockets of the retaining mechanism and accommodated within the second housing portion;wherein the second housing portion is further movable in the first direction to uncover and release the plurality of retaining elements of the endoprosthesis from the retaining mechanism; and wherein the handle includes:
a first slidable element movable with respect to a remainder of the handle along a fixed axial stroke length between first and second limits; anda second slidable element movable with respect to a remainder of the handle along a fixed axial stroke length between third and fourth limits;wherein each of the first and second limits has a different axial position than an axial position of the third limit.