Design and Fabrication of a Mock Circulatory System for Reliability Tests on Aortic Heart Valves

2007 ◽  
Author(s):  
Dhruv Singh ◽  
Abhishek Singhal
Keyword(s):  
Aortic Valve ◽  
Artificial Heart ◽  
Heart Valves ◽  
Dynamic Stress ◽  
Circulatory System ◽  
Artificial Valve ◽  
Mock Circulatory System ◽  
Artificial Heart Valves ◽  
Prosthetic Implant ◽  
Dynamic Stress Analysis

The dynamic stress analysis and response of artificial heart valves — specifically the aortic valve is impending following the increasing number of artificial valve failures. This calls for the development of a mock circulatory system in order to establish clearly the parameters associated with the circulatory system in the heart and their effects on the robustness of a prosthetic implant.

Anticoagulation after Artificial Valve Replacement with or without Atrial Fibrillation: How Much Is Really Needed?

1999 ◽  
Vol 82 (S 01) ◽  
pp. 130-135 ◽  
Author(s):  
Freek W. A. Verheugt
Keyword(s):  
Atrial Fibrillation ◽  
Heart Valve ◽  
Oral Anticoagulation ◽  
Artificial Heart ◽  
Heart Valves ◽  
Oral Anticoagulant Therapy ◽  
International Normalized Ratio ◽  
Artificial Heart Valve ◽  
Artificial Valve ◽  
Artificial Heart Valves

SummaryInsertion of a mechanical artificial heart valve is an absolute indication for the use of lifelong oral anticoagulation, irrespective the presence or absence of atrial fibrillation. Depending on the type and position of the artificial valve the optimal International Normalized Ratio (INR) for these patients is between 2.5 and 4.5, although more prospective studies on the optimal range of oral anticoagulation are necessary. Addition of low dose antiplatelet therapy may further decrease the rate of thromboembolism, but also here more studies are needed. Patients with a bioprosthesis need only oral anticoagulation for the first three months following surgery in the absence of an indication for anticoagulation for other conditions.Atrial fibrillation is often seen in patients with artificial heart valves. Stroke prevention can be instituted by the mandatory oral anticoagulant therapy. The presence of atrial fibrillation and the use of oral anticoagulation prior to heart valve surgery support the indication for the insertion of a mechanical artificial heart valve. However, relative contraindications to oral anticoagulation and the presence of sinus rhythm may favor the use of a bioprosthesis.

Fabrication of a gradient hydrophobic surface with parallel ridges on pyrolytic carbon for artificial heart valves

2021 ◽  
pp. 111894
Author(s):  
Quanchao Zhang ◽  
Zheng Yang ◽  
Xiaoyan Deng ◽  
Mengxia Peng ◽  
Yizao Wan ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Heart Valves ◽  
Hydrophobic Surface ◽  
Pyrolytic Carbon ◽  
Artificial Heart Valves

scholarly journals Numerical Study of Blood Flow Through Artificial Heart Valves

2021 ◽  
Vol 1094 (1) ◽  
pp. 012120
Author(s):  
Hussein Togun ◽  
Ali Abdul Hussain ◽  
Saja Ahmed ◽  
Iman Abdul hussain ◽  
Huda Shaker
Keyword(s):  
Blood Flow ◽  
Artificial Heart ◽  
Heart Valves ◽  
Numerical Study ◽  
Artificial Heart Valves ◽  
Flow Through

Use of a Catecholamine Sensor in the Control of an Artificial Heart System

1997 ◽  
Vol 20 (1) ◽  
pp. 37-42 ◽  
Author(s):  
K. Mabuchi ◽  
T. Chinzei ◽  
Y. Abe ◽  
K. Imanishi ◽  
T. Isoyama ◽  
...  
Keyword(s):  
Control System ◽  
Plasma Proteins ◽  
Artificial Heart ◽  
Circulatory System ◽  
Reference Electrode ◽  
Mock Circulatory System ◽  
Real Time Measurement ◽  
Artificial Hearts ◽  
Set Up ◽  
Catecholamine Concentration

An electrochemical sensor system to allow real-time measurement and feedback of catecholamine concentrations was developed for use in the control of artificial hearts. Electrochemical analyses were carried out using a carbon fiber working electrode, an Ag-AgCI reference electrode, and a potentiostat. The operating parameters of the pneumatically-driven artificial heart system were altered in accordance with the algorithm for changes in the catecholamine concentration. The minimum detectable concentrations of both adrenaline and noradrenaline in a mock circulatory system using a phosphate-buffered solution were approximately 1-2 ng/ml (10-8 mol/L). An artificial heart control system utilizing this set-up performed satisfactorily without delay, although sensor sensitivity decreased when placed in goat plasma instead of a phosphate-buffered solution, due to the adsorption of various substances such as plasma proteins onto the electrodes. This study demonstrated the future feasibility of a feedback control system for artificial hearts using catecholamine concentrations.

On polymeric mobile elements in artificial heart valves and changes occurring in these elements under the action of the blood and its components

1977 ◽  
Vol 19 (6) ◽  
pp. 1537-1544
Author(s):  
E.I. Semenenko ◽  
A.I. Ivanov ◽  
M.A. Markelov ◽  
N.B. Dobrova ◽  
Ye.V. Smurova ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Heart Valves ◽  
Mobile Elements ◽  
Artificial Heart Valves

The course of pregnancy in patients with artificial heart valves

1976 ◽  
Vol 61 (4) ◽  
pp. 504-512 ◽  
Author(s):  
Carlos Ibarra-Perez ◽  
Noel Arevalo-Toledo ◽  
Octavio Alvarez-De La Cadena ◽  
Luis Noriega-Guerra
Keyword(s):  
Artificial Heart ◽  
Heart Valves ◽  
Artificial Heart Valves

ARTIFICIAL HEART VALVES

The Lancet ◽  
1962 ◽  
Vol 280 (7266) ◽  
pp. 1171 ◽  
Author(s):  
R.W.M. Frater
Keyword(s):  
Artificial Heart ◽  
Heart Valves ◽  
Artificial Heart Valves

Time-dependent Morphological Alterations Caused by Crimping of Artificial Heart Valves

2010 ◽  
Vol 143 (4) ◽  
pp. 331
Author(s):  
H. Aupperle ◽  
F. Gruenwald ◽  
P. Kiefer ◽  
J. Kempfert ◽  
T. Walther ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Heart Valves ◽  
Time Dependent ◽  
Morphological Alterations ◽  
Artificial Heart Valves
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