A light therapy appliance comprises an electronic circuit including Light Emitting Diodes configured to emit light at one or more different wavelengths. During delivery, the sealing component is moved from a first position to a second position of the heart valve prosthesis which is longitudinally spaced apart from the first position of the heart valve prosthesis. Specifically, the jump logic can be programmed to navigate to a specified different one of the list items responsive to an activation of the obscured marker. The first finger or node 133 has means 139 to retain and rotate the free end of the line after it has passed around the other two fingers or nodes so as to be able to twist the free end 164 of the line about both a first primary portion 137 of the line and a second return portion of the line 163 to form the knot.