Cardiac stent (Stent), also known as coronary stent, is a commonly used medical device in cardiac interventional procedures, with the role of unblocking arterial blood vessels. Cardiac stents first appeared in the 1980s, and have undergone the development of metal stents, coated stents, and soluble stents, with stainless steel, nickel-titanium alloys, or cobalt-chromium alloys as the main materials.
What is the structure of a cardiac stent?
The materials used in cardiac stents are stainless steel, nickel-titanium alloy, or cobalt-chromium alloy, and different stents have different structures:
1. Traditional stent (bare-metal stent), a simple metal mesh tube.
2. Drug-eluting stent, a stent that is unfolded with drugs to inhibit cell proliferation in the tubes to prevent thrombosis.
3, Covered stent.
2What should be the characteristics of a good stent
Flexible; good tracer; small head end; x-ray impermeable; anti-thrombotic; good biocompatibility; reliable expansion performance; good support; good coverage; small surface area; in line with fluid dynamics
3What is the right stent for a person?
1. Acute myocardial infarction
The heart attack should be carried out as soon as possible within 6 hours after the occurrence of the hospital with conditions for interventional therapy, rapid opening of the blood vessels that have been occluded, and the effect of its cardiac function restoration is better than the thrombolytic and drug therapy.
2. Unstable angina
The possibility of acute myocardial infarction, suitable for the placement of cardiac stents.
3. Exertional angina
Patients who walk a little farther may experience chest pain, chest tightness and other uncomfortable symptoms. And sitting quietly or resting for a while, the symptoms will be relieved.
4. Tetralogy of Fallot
The patient's coronary artery anatomy is abnormal, and percutaneous right ventricular outflow tract placement of a cardiac stent is less risky than surgery alone.
5. Complex coronary artery disease
Complicated coronary artery disease, such as severe pulmonary stenosis or pulmonary atresia, is suitable for percutaneous intra-arterial stent placement.
Four Uses
During the treatment, the doctor first extends a very thin catheter through the blood vessel to the site of the arterial stenosis; then, the stenosis is propped up with an inflatable gelatin balloon; and finally, the arterial stent is propped up in the stenosis of the artery that has already been dilated to prevent it from retracting. After withdrawing all of the catheters, the arterial stent was left in the already dilated arterial stenosis.
V Time of Use
In-stent restenosis can occur at 6 to 8 months after implantation, meaning that reocclusion can occur within the stent. Initially, the incidence of restenosis in the metallic stent era was about 20% (15% to 40%); the incidence of restenosis in the pharmacologic stent era dropped to about 9%. If the coronary angiogram is reviewed at six months after the procedure and no in-stent restenosis occurs, restenosis is generally rare in the future.
Six costs
The question of taking this depends on what kind of stent, what kind of hospital, and what kind of geographical area, and the difference is still quite big. Domestic prices are generally in the 30,000-50,000, foreign countries are generally higher. Of course, foreign countries are better, such as Singapore, the United Kingdom have dissolvable stents.