Sewing – Method of sewing
Reexamination Certificate
2005-06-07
2010-06-22
Izaguirre, Ismael (Department: 3765)
Sewing
Method of sewing
C112S475140, C112S475170, C623S002100
Reexamination Certificate
active
07739971
ABSTRACT:
A system and method for assembling a prosthetic heart valve, including a procedure for tightly wrapping fabric around a heart valve support stent having a highly contoured undulating outflow edge. A mandrel retains tension without manual assistance in a tubular length of fabric wrapped over the support stent, and includes relatively axially movable inner and outer clamping mechanisms and a pedestal tube on which the support stent rests. The clamping mechanisms include clamps that pull the fabric only in the support stent cusps. The mandrel assembly may be placed in a chuck of a sewing machine system for automatically forming the seam. A small shuttle with bobbin thread reciprocates within a channel inside of the support stent and cooperates with the sewing machine needle to form a lock-stitch in the fabric tube. The mechanization of the fabric covering procedure greatly enhances manufacturing throughput and reduces ergonomic strain on workers.
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Edwards Heart Valve Assembly Instructions, 5 pages, dated Dec. 19, 2002 (Trade Secret, submitted under seal).
Chambers Freeman G.
Zysman Lawrence J.
Cumberbatch, Esq. Guy
Edwards Lifesciences Corporation
Izaguirre Ismael
Yadav, Esq. Rajiv
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