Title:Effect Produced by the Treatment Type on the Performance of the
Artificial Heart Valve Welded Frame
Volume: 16
Issue: 3
Author(s): German Vasilevich Pachurin, Nikolay Aleksandrovich Kuzmin, Maria Vadimovna Mochalina*Alexey Aleksandrovich Filippov
Affiliation:
- Department of sciencetechnologies and Technological Education, Minin Nizhny Novgorod State Pedagogical University,
Nizhny Novgorod, 603138, Russiaffun
Keywords:
Welded joints, pure titanium, alloy grade 40 KHNM, mechanical performance, fatigue resistance, structural heterogeneity, artificial heart valve.
Abstract:
Background: The welded joint loss of performance is largely determined by the
heterogeneity of the structural state of the heat-affected zones. The basic materials from
which the artificial heart valve welded frames are made are technically pure titanium grade
VT1-OS and alloy grade 40 KHNM with the required biomedical properties.
Objective: The study of the structural state, and changes in mechanical characteristics under
static and cyclic loading of welded joints made of pure titanium grade VT1-OS and alloy
grade 40 KHNM.
Method: The paper investigates structural changes and mechanical characteristics under static
and cyclic loading in Ringer-Locke saline solution of welded T-shaped joints made of pure
titanium grade VT1-OS and alloy grade 40 KHNM, simulating the nodes of an artificial heart
valve subject to maximum cyclic loads during operation.
Result: It is revealed that the structural and mechanical heterogeneity along the length of the
welded joints of the studied materials determines a loss of mechanical performance, both under
static and cyclic loading.
Conclusion: Experimental batches of welded elements of artificial heart valve assemblies
made of VT1-OS titanium and 40 KHNM alloy according to the established optimal modes
have successfully passed full-scale tests on physiological and biological stands in conditions
as close as possible to the operational ones.