Angioplasty is a technique that broadens a narrow or congested blood vessel using a inflatable catheter. It is used to treat atherosclerosis (blood vessel impediments), and regularly made by an interventional cardiologist, a medical doctor with distinctive training in the handling of the heart, using invasive catheter-based measures. Angioplasty is frequently achieved as a minimally-invasive technique, where a stent is implanted into the blood vessel to preserve it open. A conceivable substitute to heart surgery, it has dependably been shown to diminution indications due to coronary artery disease and decrease cardiac ischemia.
1. An introducer pointer is entrenched into the femoral artery in …show more content…
A controller drain is then strapped through the sheath introducer. Colorants can be inoculated through the guide catheter into the coronary artery to pinpoint and study the polluted artery using x-ray. 4. After reviewing the x-ray image, the cardiologist chooses the type of balloon catheter and plastic coronary guide wire that will be used. 5. The elastic coronary guide rope with radiopaque plastic tip is then introduced into the supervisory catheter and into the coronary artery. 6. Watching through x-ray imaging display, the cardiologist directors the flexible coronary guide wire through the coronary artery to the site of the obstruction. 7. When the stretchy guide wire reaches the obstruction, it is then strapped across the obstacle. 8. A hollow-tipped balloon catheter is then interleaved, using the plastic guide wire as a conduit to the site of the impasse. At this point, the balloon is still collapsed. 9. After the balloon catheter spreads and is strapped inside the obstruction, the balloon is then exaggerated. Inflating the balloon increases the area about it and bandages the plaque accumulation (blockage). The exaggerated balloon also enlarges the artery …show more content…
t pr 22 = σ (6)
In both Equation 5 and 6, p is the internal pressure of the vessel (created by a contained gas or fluid), r is the inner radius of the vessel, and t is the thickness of the wall. The hoop and longitudinal stresses are assumed to be constant throughout the wall of the vessel.27 These stresses can be compared to calculated yield stresses in order to predict if the vessel will yield under given pressures at given thicknesses. Yield criterion developed by both von Mises and Tresca both propose to calculate these stresses using different methods. While the Tresca criterion predicts more conservative values, the von Mises criterion has been shown to be more accurate for states of biaxial stress, such as those experienced by an angioplasty balloon.28 Because of this, the von Mises criterion was used for this investigation. The von Mises yield criterion is based upon the Maximum Energy Failure
Theory, which states that failure is caused by the component of strain energy that