Artificial Herzklappe / Kardiologie

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Page modified: Saturday, June 24, 2006 09:16:32

Artificial Herzklappe one calls out technical material a manufactured replacement for a natural Herzklappe. The first artificial Herzklappe was implantiert 1961 by the two Americans Albert Starr and Lowell Edward. In the year 2004 in the FRG about 17000 heart flap operations were accomplished.

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Mechanical Herzklappen consist of a flap ring and or two flap wings of graphite, which is coated with pyrolytischem carbon. The flap ring is surrounded by a white polyester seal, which serves for the attachment in the heart. Mechanical Herzklappen can produce quiet noises ("Prothesenklicks ") when opening and closing the flap wings. In order to avoid the formation of Thromben at the artificial flap surfaces, usually a durable anti-coagulation is necessary. Mechanical Herzklappen have one life span of over 100 years in lab tests.

Biological Herzklappen are Homografts (human donor flaps, which are = after the preparation in nitrogen are kept), Aortenklappensegel manufactured by pigs, the heart bag of cattle or from Rinderhalsvenen. (The preparation in an antibiotic solution with 4"° C, Roentgen irradiation or the drying freezing are underlaid the the fabric are fastened or stand-free on a plastic stand ("Stent "). Also these flaps are surrounded for inserting with a polyester seal. The life span of biological Herzklappen can be limited, be subject there it in the comparison to the own fabric an accelerated aging process (calcifying). This can lead after some years to visible and also functionally important malfunctions, which make an exchange necessary. But no anti-coagulation is necessary with many patients.

Biological Herzklappen calcify according to experience with children in former times and faster than with adults. The cause for this is so far not well-known and it can also no forecast be made, with which humans this condition occurs when.