Patent ID: 7993259
Filing Date: 2011-08-09
Classification: A61F,A61M

Abstract:
1. A percutaneous intra-aortic ventricular assist device adapted for implantation in an aorta that has a luminal wall, said percutaneous intra-aortic ventricular assist device comprising: a tubular stent body made from a material expandable at a site of implantation, configured to be adapted to anchor on the luminal wall of the aorta downstream of an aorta root in terms of an ejected flow of blood under systole pressure, and having an abluminal surface which confronts the luminal wall, and a luminal surface which is opposite to said abluminal surface, and which defines an interior space extending along a central axis in a lengthwise direction; an inner tubular body connected to said tubular stent body and having an outer tubular surface which extends along the central axis to define, in cooperation with said luminal surface of said tubular stent body, a surrounding passage, and an inner tubular surface which is opposite to said outer tubular surface in radial directions, which defines an accommodation chamber, and which has a guiding slot unit that extends in the lengthwise direction to terminate at proximal and distal loci relative to the aorta root, and that extends radially through said outer tubular surface to communicate said surrounding passage with said accommodation chamber; a vane member disposed to be movable in said surrounding passage between proximal and distal limits that respectively correspond to said proximal and distal loci of said guiding slot unit, and that are apart from each other by a predetermined traveling length, and configured to help force the ejected flow of the blood downstream when said vane member is moved from said proximal limit towards said distal limit; a carrier member disposed to be movable in said accommodation chamber between said proximal and distal loci of said guiding slot unit; a rib unit disposed to move along said guiding slot unit, and configured to interconnect said carrier member and said vane member so as to permit said vane member to be moved with said carrier member; a first pulled string having first inner and outer ends which are opposite to each other lengthwise, and which are respectively connected to said carrier member and led out of a patient's body such that when said first outer end is pulled externally, said carrier member is moved towards said distal locus of said guiding slot unit; a second pulled string having second inner and outer ends which are opposite to each other lengthwise, and which are respectively connected to said carrier member and led out of the patient's body such that when said second outer end is pulled externally, said carrier member is moved towards said proximal locus of said guiding slot unit; an alternately pulling mechanism disposed to couple with said first and second outer ends respectively such that when said alternately pulling mechanism is actuated to alternately pull said first and second outer ends in a pulling direction respectively to displace said carrier member to said distal and proximal loci of said guiding slot unit respectively, said second and first pulled strings are enabled respectively by alternately pulling of said first and second outer ends to respectively permit said second and first outer ends to tensely retrieve, concomitant with the alternate pulling of said first and second outer ends respectively, the predetermined traveling length in a releasing direction that is opposite to the pulling direction; and a synchronizing member disposed to couple with said alternately pulling mechanism so as to bring the pulling of said first and second outer ends in the pulling direction in synchronization with the alternate systole and diastole actions.