Maya Ellison
Stents are small tubes placed into a hollow structure in the body, such as an artery, vein, or ureter, to treat narrowed or blocked blood vessels. They can be made of metal or plastic. Metal stents are usually made of metal mesh and are put into arteries after a procedure called angioplasty, which is used to open blocked coronary arteries without open-heart surgery. Plastic stents, on the other hand, are made of corn-based plastic and dissolve after opening clogged arteries.
| Characteristics | Values |
|---|---|
| Material | Metal (mesh) or corn-based plastic |
| Size | Tiny or small |
| Function | Treat narrowed or blocked blood vessels, including coronary arteries |
| Procedure | Inserted into a blocked passageway to keep it open; can be done through surgery or via a catheter in a vein or during an endoscopic procedure |
| Placement | Heart, blood vessels, urinary tract, prostate gland, colon, esophagus, bile ducts, eyes, kidneys |
| Recovery | Less discomfort and shorter recovery time compared to coronary artery bypass surgery |
| Risks | Blood clot formation, blockage due to tissue overgrowth or debris, perforation of the vessel |
| Medication | Blood-thinning drugs, antiplatelets |
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What You'll Learn
Heart stents are usually made of metal mesh
The first stent implanted into a human coronary artery was made of bare metal. Metal stents almost eliminated the risk of the artery collapsing but only modestly reduced the risk of re-narrowing. About a quarter of all coronary arteries treated with bare-metal stents would close up again, usually within six months.
To prevent this, most stents are now coated with medicine to prevent scar tissue from forming inside the stent. These stents are called drug-eluting stents. They release medicine within the blood vessel that slows the overgrowth of tissue within the stent, helping to prevent the blood vessel from becoming narrow again.
However, there are still complications associated with metal stents, and they are not suitable for everyone. For example, there is a risk of blood clots forming in the stent, which can cause the artery to narrow or even block completely. To prevent this, people with metal stents are usually prescribed blood-thinning drugs.
An alternative to metal stents is a new type of heart stent made from corn-based plastic. These plastic stents dissolve after opening clogged arteries, eliminating the risk of blood clots forming within the stent.
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Metal stents were first implanted in 1986
The first stents were made from stainless steel and were bare-metal stents. They were self-expanding and were independently implanted by Puel and Sigwart in 1986. The following year, in 1987, a balloon-expandable stent was developed by Palmaz and Schatz. This became the first Food and Drug Administration (FDA)-approved stent in the United States.
Bare-metal stents were the first-generation stents. They almost eliminated the risk of the artery collapsing but only modestly reduced the risk of re-narrowing. About a quarter of all coronary arteries treated with bare-metal stents would close up again, usually within about six months. To address this issue, second- and third-generation stent designs are being developed and tested in clinical trials.
Metal stents are usually made of a metallic alloy and are inserted into the lumen (hollow space) of an anatomic vessel or duct to keep the passageway open. They are highly elastic to allow for expansion and contraction within the blood vessel and have high strength and fatigue resistance to withstand the constant physiological load of the arteries. However, metal stents can lead to thrombosis at the site of treatment or inflammation scarring.
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Plastic stents are made from corn-based plastic
Heart stents are small, expandable tubes used to treat narrowed arteries. Typically, stents are made of metal mesh, but plastic stents are also available. These plastic stents are made from corn-based plastic, also known as polylactic acid (PLA). PLA is a plastic substitute made from fermented plant starch, usually corn. It is a popular alternative to traditional petroleum-based plastics and is used in many industries, including 3D printing and food packaging.
PLA offers several advantages over conventional plastics. Firstly, it is biodegradable, reducing the carbon footprint of industries that utilize it. Secondly, it is derived from renewable, carbon-absorbing plants, which helps to reduce greenhouse gas emissions. Additionally, PLA does not emit toxic fumes when incinerated.
However, there are some drawbacks to using PLA for plastic stents. One issue is the slow rate of biodegradability, which means that it may take a significant amount of time for the stent to dissolve completely after it has opened a clogged artery. Another concern is the high use of genetically modified corn in the production of PLA, which may be problematic for some individuals or organizations with ethical or health considerations.
Despite these limitations, corn-based plastic stents offer a promising alternative to metal stents, providing a solution to many of the dangers associated with their metallic counterparts. By dissolving after unclogging arteries, these stents can potentially reduce the risk of blood clots and other complications associated with permanent metal stents. Overall, corn-based plastic stents present a viable option for patients requiring treatment for narrowed arteries, offering both effectiveness and environmental benefits.
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Metal stents can cause blood clots
Stents are small, expandable tubes used to treat narrowed arteries in the body. They are commonly used in the arteries of the heart, or coronary arteries, to increase blood flow. The first heart stent was implanted in a human coronary artery in 1986, and the first-generation stents were made of bare metal. Metal stents can cause blood clots, which can lead to a heart attack or sudden cardiac arrest.
The presence of a foreign body, such as a metal stent, in constant contact with the blood may lead to clotting in some people. This is known as thrombosis and can occur in about 1-2% of people with stents. To prevent this, people are usually prescribed blood-thinning drugs, such as aspirin and clopidogrel (Plavix), after receiving a stent. These drugs can be taken for up to six months or longer, depending on the patient's needs.
While metal stents can cause blood clots, it is important to note that stents are also used to treat blood clots. Stent placement is not without risks, and complications such as blood clots and vessel rupture can occur due to the delicate nature of the heart and arteries. However, the use of stents helps prevent heart attacks by ensuring blood flow through the coronary arteries.
The development of drug-coated stents has offered a solution to the problem of renarrowing associated with bare-metal stents. These stents release drugs into the bloodstream to prevent tissue regrowth that can clog arteries. However, drug-coated stents have also been linked to an increased risk of blood clots, especially if the prescribed blood-thinning drugs are discontinued too early.
The risks associated with metal stents have led to the development of alternative stent materials, such as corn-based plastic. These plastic stents dissolve after opening clogged arteries, eliminating the long-term risks associated with permanent metal stents.
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Metal stents can be coated with medicine
Heart stents are small, expandable tubes that treat narrowed arteries in the body. They are typically made of metal mesh and are put into arteries after a procedure called percutaneous coronary intervention, or angioplasty. Metal stents, also known as bare-metal stents, were first developed in the 1990s and have since been improved upon with the invention of drug-eluting stents.
Drug-eluting stents are coated with medicine, while bare-metal stents are not. Once a bare-metal stent is placed in the body, the body begins to build tissue around the metal. This tissue regrowth can lead to scarring and the narrowing of arteries again, a process called restenosis. To address this issue, drug-eluting stents were created to slowly release medication directly into the artery, helping to keep it open and reducing the chances of re-narrowing.
The medication coating on drug-eluting stents can help lower plaque buildup in the arteries and increase blood flow to the heart, thereby easing chest pain. These stents also have the added benefit of lowering the chances of arteries narrowing again compared to other treatments such as angioplasty or balloon treatment. As a result, drug-eluting stents have largely replaced bare-metal stents as the preferred option for treating narrowed arteries.
However, despite the advantages of drug-eluting stents, there may still be times when a bare-metal stent is the better choice. Additionally, as with any medical procedure or device, there are potential risks associated with drug-eluting stents. For example, patients will need to take antiplatelet medications long-term after receiving a drug-eluting stent to prevent blood clots from forming.
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Frequently asked questions
A heart stent is a small tube placed into a hollow structure in the body, such as an artery or vein, to keep it open.
Heart stents are typically made of metal mesh, but they can also be made of corn-based plastic.
Heart stents are inserted into blocked coronary arteries to expand and hold them open, improving blood flow to the heart.
Yes, there are different types of heart stents, including bare metal stents, drug-eluting stents, and absorbable stents.
Some risks associated with heart stents include blood clots, tissue overgrowth or debris blocking the stent, and perforation of the vessel.
