Improvement in or relating to prosthetic cardiac valve and to the method of manufacturing same

There is provided an improved valve assembly having a valve housing, a sewing ring component held to the outer surface of the valve housing and a disc occuder tiltably held on suitable supports within the housing. The sewing ring is of polyester, the valve housing is of cobalt-nickel or cobalt-chrom...

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Bibliographische Detailangaben
Hauptverfasser:	BHUVANESHWAR, GOBICHETTIPALAYAM SUBBARATNAM, VAYALAPPIL, MURALEEDHARAN CHIRATHODY, NAIR, OMANA AMMA SREEDHARAN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS DISINFECTION, STERILISATION, OR DEODORISATION OF AIR FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PROSTHESES TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	There is provided an improved valve assembly having a valve housing, a sewing ring component held to the outer surface of the valve housing and a disc occuder tiltably held on suitable supports within the housing. The sewing ring is of polyester, the valve housing is of cobalt-nickel or cobalt-chromium-tungsten based alloy or of titanium/titanium alloys. The valve disc is made of modified ultra high molecular weight polyethylene. There is also disclosed a process for the manufacture of the valve assembly in which the valve disc and modification of the UHMW-PE take place simultaneously. The special process comprises cryo machining of a blank of UHMW-PE, solid state compaction of the blank, annealing of the compact followed by further cryo machining, anealing and cleaning steps.