Annuloplasty device
An annuloplasty device is disclosed comprising first and second support rings being configured to be arranged as a coil in a first configuration around an axial direction, wherein the first and second support rings are configured to be arranged on opposite sides of native heart valve leaflets of a heart valve, a stiffening unit, wherein at least part of the first and second support rings comprises an interior channel configured to receive the stiffening unit, wherein insertion of the stiffening unit into the interior channel increases the stiffness of the first and/or second support rings. A method of repairing a defective heart valve is also disclosed.
1. Method of repairing a defective heart valve, comprising
positioning first and second support rings of an annuloplasty device in a first configuration as a coil on opposite sides of native heart valve leaflets of the heart valve, and
increasing the stiffness of the positioned first and/or second support rings by inserting a stiffening unit into an interior channel arranged in at least part of the first and/or second support rings,
wherein positioning the first and second support rings comprises:
advancing the first and second support rings over a guide wire extending through the interior channel to assume said coil on the opposite sides;
the method subsequently comprising
retracting the guide wire, and
inserting the stiffening unit into the interior channel.
2. Method according to claim 1 , comprising
activating a contracted state of the annuloplasty device so that a first pitch distance (p 1 ) between the first and second support rings in a first configuration is reduced to a second pitch distance (p 2 ) being shorter than the first pitch distance, whereby the first and second support rings move towards each other to pinch the native heart valve leaflets, wherein the contracted state is activated by the insertion of the stiffening unit into the interior channel, whereby the first and second support rings transfer from the first configuration to the contracted state.
3. Method according to claim 1 , wherein positioning the first and second support rings comprises
positioning a sheath to form first and second curves thereof as a coiled shape on the opposite sides of the native heart valve leaflets,
ejecting the first and second support rings from the sheath while retracting the sheath such that the annuloplasty device is arranged along the first and second curves on the opposite sides.
4. Method according to claim 3 , wherein the first and second support rings are kept stationary in relation to the heart valve when being ejected from the sheath while simultaneously retracting the sheath.
5. Method according to claim 3 , whereby retention units arranged on the first and/or second support rings are engaged into tissue of the heart valve from the opposite sides when the sheath is retracted.
6. Method according to claim 5 , comprising forcing the retention units into the tissue by the insertion of the stiffening unit into the interior channel.
7. Method according to claim 5 , wherein the retention units comprise a shape-memory material, the method comprising
activating the shape-memory material to cause the retention units to transfer from a retracted state, in which the retention units are flush with an outer surface of the first and/or second support rings, to an expanded state, in which the retention units protrudes form the outer surface of the first and/or second support rings.
8. Method according claim 3 , wherein the opposite sides are an atrial side of the heart and a ventricular side of the heart, wherein a first curve of the sheath is arranged along an annulus of the heart valve on the atrial side, and wherein a second curve of the sheath is arranged around chordae of the heart valve on the ventricular side.
9. Method according to claim 1 , comprising
advancing the sheath and the first and second support rings over the guide wire to assume the coiled shapes thereof.