Measuring and testing – Specimen model or analog
Patent
1992-07-09
1995-04-18
Noland, Tom
Measuring and testing
Specimen model or analog
738656, 73 37, G01M 1900
Patent
active
054068576
ABSTRACT:
A fixture for testing a circumferentially compliant bioprosthetic valve. The fixture comprises a silicone rubber simulated aorta which approximates the geometry of a healthy human aorta and a cradle for the aorta. The compliance characteristics of the aorta can be selected by varying the proportions of ingredients in the silicone rubber, so that simulated aortas of different compliance but identical geometries can be provided. The compliant valve is disposed inside the aorta and held in place by suturing or the like. In one embodiment, the aorta and valve are supported by means of a cylindrical cradle, with the inflow and outflow ends of the aorta being folded over cylindrical rims on the respective inflow and outflow ends of the cradle. End caps are then fitted in place over the folded-over ends of the aorta, the end caps having holes therein to allow flow through the aorta and valve. The end caps are provided with O-rings on their outer surfaces, so that the assembled fixture can be inserted into a testing apparatus, with the aorta and valve held in place in the sealed flow loop of the apparatus. In another embodiment, adapter rings are provided for the inflow and outflow ends of the aorta, with the ends of the aorta being folded over cylindrical rims disposed around the inner circumference of each of the adapter rings. The adapter rings are also provided with O-rings, allowing the ends of the aorta to be received in a testing apparatus so that the aorta and valve are disposed along the sealed flow loop of the apparatus.
REFERENCES:
patent: 2924894 (1960-02-01), Hellund
patent: 3208448 (1965-09-01), Woodward
patent: 3601877 (1971-08-01), Goosen
patent: 3631607 (1972-01-01), Koff et al.
patent: 4682491 (1992-07-01), Pickard
patent: 4974461 (1990-12-01), Smith et al.
patent: 5052934 (1991-10-01), Carey et al.
patent: 5139515 (1992-08-01), Robicsek
patent: 5272909 (1993-12-01), Nguyen et al.
Optimal Design of Aortic Leaflet Prosthesis, Journal of the Engineering Mechanics Division, By Dhanjoo N. Ghista, Helmut Reul, Gautam Ray, and K. B. Chandran, Feb. 1978, pp. 97-117.
Optimal Prosthetic Aortic Leaflet Valve: Design Parametric and Longevity Analyses: Development of the Avcothane-51 Leaflet Valve Based on the Optimum Design Analysis, Journal of Biomechanics, Oct. 5/6, 1977 pp. 313-324.
Measurement of Turbulence in Aortic Valve Prostheses: An Assessment by Laser Doppler Anemometer, Proceedings of a Symposium at the 14th Annual Meeting of the Association for the Advancement of Medical Instrumentation, P. C. Lu, A. M. Sallam, and N. H. C. Hwang, Las Vegas, Nev., May 21, 1979 pp. 91, 94, 95, 108.
Normal Aortic Valve Function in Dogs, The American Journal of Cardiology, Mano Thubrikar, PhD, Robert Harry, MD, Stanton P. Nolan, MD, FACC, Oct. 1977, vol. 40, pp. 563-568.
The Dynamic Aortic Root, Journal of Thorac Cardiovascular Surgery, Richard J. Brewer, M. D., David Deck, PhD, Bienvenido Capati, MD, and Stanton P. Nolan, MD., Sep. 1976, 72(3); pp. 413-417.
Assessment of Aortic Pressure-Volume Relationships with an Impedance Catheter, Catheterization and Cardiovascular Diagnosis, 15:27-36 (1988), by Jmaes J. Ferguson, III, MD, Michael J. Miller, MD, Peter Sahagian, BA, Julian M. Aroesty, MD and Raymond G. McKay, MD.
The Geometry of the Aortic Root in Health at Valve Disease and After Valve Replacement, Journal of Biomechanics, by H. Reul, A. Vahlbruch, M. Giersiepen, Th. Schmitz-Rode, V. Hirtz and S. Effert. vol. 23, No. 2, pp. 181-191 (1990).
Aortic Distensibility Abnormalities in Coronary Artery Disease, American Journal of Cardiology, by Christodoulos Stefanadis, MD, Charles F. Wooley, MD, Charles A. Bush, MD, Albert J. Kolibash, MD and Harisios Boudoulas, MD., pp. 1300-1304, 1987.
Capps Mark J.
Eberhardt Carol E.
Salazar Luis
Medtronic Inc.
Noland Tom
Patton Harold L.
Wiles Terry L.
LandOfFree
Method and apparatus for testing of circumferentially compliant does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for testing of circumferentially compliant , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for testing of circumferentially compliant will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-61127