Transcatheter valve laceration device and method
A transcatheter valve laceration device ( 10, 100 ) includes a leaflet support frame ( 12, 112 ) and a leaflet cutting assembly ( 14, 114 ), both of which are movably mounted on a guiding structure ( 16, 116 ) and movable between contracted and expanded orientations. In the expanded orientation, a blade protector ( 24, 124 ) of the leaflet support frame ( 12, 112 ) is positioned over a cutting element ( 36, 136 ) of the leaflet cutting assembly ( 14, 114 ).
1 . A transcatheter valve laceration device comprising:
a leaflet support frame and a leaflet cutting assembly, both of which are movably mounted on a guiding structure and movable between contracted and expanded orientations, wherein said leaflet cutting assembly comprises a cutting element that comprises a sharp blade arm that has a pointed sharp tip at a distal end of said sharp blade arm; and
a blade actuator arm that has one end that pivots with respect to said guiding structure and an opposite end pivotally coupled to said sharp blade arm proximal to said pointed sharp tip; and
wherein in the expanded orientation, a blade protector of said leaflet support frame is positioned over said pointed sharp tip of a cutting element of said leaflet cutting assembly, and said pointed sharp tip is positioned to puncture a leaflet, and said cutting element is configured to cut the leaflet by axial movement of said leaflet cutting assembly.
2 . The transcatheter valve laceration device according to claim 1 , wherein in the expanded orientation, said blade protector is positioned radially outwards with respect to said cutting element.
3 . The transcatheter valve laceration device according to claim 1 , wherein said cutting element is configured to lacerate tissue located between said cutting element and said blade protector.
4 . The transcatheter valve laceration device according to claim 1 , wherein said leaflet cutting assembly comprises support arms coupled to a first biasing device and said leaflet support frame comprises frame arms coupled to a second biasing device, wherein contraction of said first biasing device causes outward movement of said support arms and expansion of said leaflet cutting assembly, and contraction of said second biasing device causes outward movement of said frame arms and expansion of said leaflet support frame.
5 . The transcatheter valve laceration device according to claim 4 , wherein said first biasing device has a stronger biasing force than said second biasing device.
6 . The transcatheter valve laceration device according to claim 1 , wherein a cutting edge of said sharp blade arm faces towards said guiding structure.
7 . A method for lacerating heart tissue comprising:
introducing the device of claim 1 with said leaflet support frame and said leaflet cutting assembly in contracted orientations to a heart;
expanding said leaflet support frame;
expanding said leaflet cutting assembly;
first piercing said heart tissue with said pointed sharp tip of said cutting element; and
afterwards axially moving said leaflet cutting assembly to lacerate heart tissue located between said cutting element and said blade protector.
8 . The method according to claim 7 , comprising lacerating the heart tissue in a TAVR procedure.
9 . The method according to claim 7 , comprising lacerating the heart tissue in a TAVR-in-TAVR procedure.
10 . The method according to claim 7 , comprising lacerating the heart tissue in a tricuspidization procedure.