Projeto, fabricação e testes de uma bancada experimental de fluxo pulsátil.

Abstract

A pulsatile flow pumping system allows replicating forms hydraulic flow wave, with reasonable accuracy for various simulations, for example physiological blood flows, inflows of low pressure hydraulic systems, etc. An important application of this system is to enable simulation of blood flow in the human body allowing the analysis of the mechanics of the human circulatory system fluids, with a control variable such as pressure, temperature and cycles per minute, being able to have a very next condition reality, and allows creating many different situations modifying the values of the variables mentioned above. For analysis of cardiovascular stents, for example, ASTM 2477-7 recommended that tests be conducted under conditions similar to those of use, ie in pulsatile flow simulating human heart. The stent is a medical device that can be defined as a metal cylinder or polymer, usually in network form, which is placed in the lumen of an anatomical vessel (such as an artery or a bile duct) in order to reopen the passage of this vessel which is fully or partially obstructed, usually in order to maintain a normal blood flow. Because of its application directly influence the health of the patient, there is the need to search for ways to improve the physical and chemical properties, making the most reliable technology of stents without sacrificing the biocompatibility. Thus, this paper proposes the development of a pulsatile flow test rig that can be used for testing on stents. The project was divided into two stages, the first was the design and craftsmanship of the bench (Conceptual Design and Mechanical) and in a second step, the same instrumentation (electronic design). As project grant were studied various pulsatile flow generating benches (which simulate the human heart) and from the these, designed and manufactured a bench working with leaking fluid in a closed cycle. The same consists of a linear actuator (Pulse Generator) and several sensor elements that allow the system to work in closed loop, with temperature control, pressure and number of cycles per minute. All data generated is stored in a database and can be monitored remotely via the web. For analysis, the test body is placed inside all or a test cell, and a fluid is circulated through the tubes pulsatile.