Occlusion device and method for its manufacture
The present invention relates to an occlusion device ( 1 ) consisting of a braiding ( 2 ) of thin wires or threads ( 4 ) which is given a suitable form in a molding and heat treatment procedure. The occlusion device ( 1 ) has a proximal retention area ( 6 ) and a distal retention area ( 8 ), whereby the ends of the wires or threads ( 4 ) converge into a holder ( 5 ) in distal retention area ( 8 ). A cylindrical crosspiece ( 10 ) is furthermore disposed between the proximal and distal retention areas ( 6, 8 ). With the objective of providing an occlusion device which positions as flat as possible against the septum at the proximal side of a septal defect in the inserted state, the invention provides for the proximal retention area ( 6 ) of the braiding ( 2 ) to exhibit a completely closed proximal wall ( 112 ) disposed with a continuous surface at the proximal end of the occlusion device ( 1 ) which forms the proximal end ( 12 ) of said occlusion device ( 1 ).
1. A braiding machine producing a spherical braid structure, the braiding machine comprising:
a braiding head unit comprising in combination:
a braiding head,
a braiding crown for spherical braiding,
a plurality of form elements,
the braiding head having a first end located proximal to the braiding crown and an opposite second end,
the first end being curved or rounded peripherally in a direction from the first end to the second end,
wherein the braiding head unit is placed axially in a center of an orbit of impellers of the braiding machine, and each of said impellers arranged to hold an end of a wire extending from a position between the braiding crown and across the braiding head of the braiding head unit,
wherein the form elements comprise a plurality of elongate elements which connect the braiding crown to the braiding head, thereby forming a gap between the braiding crown and the braiding head, so that when in use, wires of a ball braid between the braiding crown and the braiding head, and stretch past the form elements.
2. The braiding machine according to claim 1 , wherein the braiding crown has a circular shape at an end connected to the braiding head, said plurality of elongate elements being disposed about a periphery of said circular shape.
3. The braiding machine according to claim 1 , wherein the elongate elements are connected to a perimeter of the first end of the braiding head, the first end being curved or rounded radially outside the perimeter.