Opening mechanism for umbrella-like intravascular shunt defect closure device
First Claim
1. In an umbrella-like expansive device for closing intravascular shunt defects and the like, said device having a central hub, a plurality of struts movably mounted on the hub and movable between a first, collapsed position in which the struts extend generally parallel to the axis of the hub and a second, expanded position in which the struts extend generally radially from the hub, and closure material extending between the struts and secured thereto, an improved expansion means for moving the struts from the first position to the second position comprising a foldable, resilient strip extending between each pair of adjacent struts and secured thereto, each strip being folded between the struts when the struts are in the first position, whereby the folded resilient strips bias the struts from the first position toward the second position.
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Accused Products
Abstract
The pivotable struts of an umbrella-like shunt defect closure device are resiliently biased from a collapsed position to an expanded position by resilient and foldable flat ring sections which extend between the struts when the struts are in their expanded positions but which are folded between the struts when the struts are in their collapsed positions.
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Citations
14 Claims
- 1. In an umbrella-like expansive device for closing intravascular shunt defects and the like, said device having a central hub, a plurality of struts movably mounted on the hub and movable between a first, collapsed position in which the struts extend generally parallel to the axis of the hub and a second, expanded position in which the struts extend generally radially from the hub, and closure material extending between the struts and secured thereto, an improved expansion means for moving the struts from the first position to the second position comprising a foldable, resilient strip extending between each pair of adjacent struts and secured thereto, each strip being folded between the struts when the struts are in the first position, whereby the folded resilient strips bias the struts from the first position toward the second position.
- 11. In an intravascular shunt defect closure device for closing a shunt defect having a central hub and a plurality of struts pivotally mounted on the hub, each of the struts being pivotable about an axis which is spaced from and extends perpendicularly to the axis of the hub and being pivotable from a first, collapsed position in which the strut extends generally parallel to the axis of the hub and a second, expanded position in which the strut extends generally perpendicularly to the axis of the hub, an improved expansion means for moving the struts from the first position to the second position comprising an arcuately shaped foldable and resilient ring section extending between each pair of adjacent struts and secured thereto at points spaced from the pivot points of the struts, each ring section having a shape corresponding generally to a sector of an annulus and being substantially flat when the associated struts are in the second position and being folded into a general U-shape which extends outwardly from the axis of the hub when the struts are in the first position whereby the folded resilient ring sections bias the struts from the first position to the second position.
Specification