Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Library and Museum Collections Description An account of the resource Please browse the more than 8000 knit- and crochet-related treasures in the CKC Collections Resource <a href="http://digital.centerforknitandcrochet.org/collections/show/1">Museum and Library Collections</a> (drawn from <a href="https://dp.la/info/developers/" target="_blank" rel="noreferrer noopener">Digital Public Library of America</a>). CKC is seeking new partner organizations to share their collections of knitting and crochet with visitors to this resource. Contact us at <a href="mailto:collections@centerforknitandcrochet.org">collections@centerforknitandcrochet.org</a> for more information about participating. <br /><br /><a href="https://docs.google.com/document/d/11Hb_Y75HnhkCE5i4mKpcTlB8Msp_lB0XUtQr5S8XXKA/edit?usp=sharing" target="_blank" rel="noreferrer noopener">Learn more about criteria for Share Your Treasures.</a> Identifier An unambiguous reference to the resource within a given context 1 Still Image Upload at least one image that shows the object in its entirety along with detail views as desired. • Jpeg format • At least 3 MP in size • 300 ppi • Images produced with digital camera to highest quality setting (e.g. superfine, best) are usually acceptable. • Users who want to contribute video or audio files please contact info@centerforknitandcrochet.org for more information. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context http://dp.la/api/items/831e9ccd9c0bf1b155f1f09abb4faa3d Date A point or period of time associated with an event in the lifecycle of the resource after 1977 Title A name given to the resource Hall-Kaster Heart Valve Description An account of the resource The Hall-Kaster is a pivoting disc heart valve prostheses that began manufacture in 1977. It has open ended struts to prevent the buildup of thrombus, and a pivotal disc mechanism designed to split the orifice into two equal parts when opened. There were no welds, joint, or bends that could weaken the valves structure after years of use. The disc opens to 75 degrees with an aperture in center, made of graphite substrate and tantalum (the latter makes the disc radiopaque.) It is coated in pyrolytic carbon. The valve is housed in a titanium ring, with a sewing ring made of knitted Teflon. The valve was successful, with regurgitation in 4 of 160 patients. At least 183,000 aortic and 122,000 mitral valves were implanted worldwide with no reports of structural failure. The valve was developed by Dr. Karl Victor Hall (1917- ), chairman of Department of Surgery at Rikshospitalet in Oslo, Norway, and Robert Kaster, an electrical engineering with a degree from the University of Minnesota (1951). He became interested in designing prostheses while working in Dr. C. Walton Lillehei's laboratory. It was there that he designed the tilting disc valve known as the Lillehei-Kaster valve. Currently not on view Subject The topic of the resource Artificial Heart Valves Prosthesis Cardiology Artificial Organs Health &amp; Medicine Medtronic Creator An entity primarily responsible for making the resource Medtronic References A related resource that is referenced, cited, or otherwise pointed to by the described resource. http://collections.si.edu/search/results.htm?q=record_ID=nmah_1757049&amp;repo=DPLA Relation A related resource thumb:001:https://ids.si.edu/ids/deliveryService?id=NMAH-RWS2016-09497&amp;max=150 full:001:https://ids.si.edu/ids/deliveryService?id=NMAH-RWS2016-09497&amp;max=150 linkto:001:http://collections.si.edu/search/results.htm?q=record_ID=nmah_1757049&amp;repo=DPLA Source A related resource from which the described resource is derived Smithsonian Institution VRA Core VRA Core standard for artistic pieces and cultural heritage artifacts. The first input will be treated as a <display> element. More detailed VRA Core metadata is available below that input. Subject Terms or phrases that describe, identify, or interpret the Work or Image and what it depicts or expresses. These may include generic terms that describe the work and the elements that it comprises, terms that identify particular people, geographic places, narrative and iconographic themes, or terms that refer to broader concepts or interpretations. Artificial Heart Valves Prosthesis Cardiology Artificial Organs Health &amp; Medicine Medtronic