An intrauterine device (IUD), also known as intrauterine contraceptive device (IUCD or ICD) or coil, is a small, often T-shaped birth control device that is inserted into a woman's uterus to prevent pregnancy. IUDs are one form of long-acting reversible birth control.
Among birth control methods, IUDs, along with contraceptive implants, result in the greatest satisfaction among users. IUDs are also safe and effective in adolescents and those who have not previously had children. Once removed, even after long-term use, fertility returns to normal rapidly. Copper devices have a failure rate of about 0.8% while hormonal (levonorgestrel) devices fail about 0.2% of the time within the first year of use. In comparison, male sterilization and male condoms have a failure rate of about 0.15% and 15%, respectively.
While copper IUDs may increase menstrual bleeding and result in more painful cramps, hormonal IUDs may reduce menstrual bleeding or stop menstruation altogether. After three months there is about a 90% decrease in bleeding. Cramping can be treated with NSAIDs. More serious potential complications include expulsion (2-5%) and rarely perforation of the uterus (less than 0.7%). IUDs do not affect breastfeeding and can be inserted immediately after delivery. They may also be used immediately after an abortion.
The use of IUDs as a form of birth control dates from the 1800s. A previous model known as the Dalkon shield was associated with an increased risk of pelvic inflammatory disease. However, current models don't affect PID risk in women without sexually transmitted infections during the time of insertion.
Video Intrauterine device
Types
The types of intrauterine devices available, and the names they go by, differ by location.
In the United States, there are two types available:
- Nonhormonal: Copper-containing IUD (ParaGard and others)
- Hormonal: Progestogen-releasing IUD (Mirena and others)
The WHO ATC labels both copper and hormonal devices as IUDs. In the United Kingdom, there are over 10 different types of copper IUDs available. In the UK, the term IUD refers only to these copper devices. Hormonal intrauterine contraception is considered to be a different type of birth control and is labeled with the term intrauterine system (IUS).
Non-hormonal
Most copper IUDs have a plastic T-shaped frame that is wound around with pure electrolytic copper wire and/or has copper collars (sleeves). The arms of the frame hold the IUD in place near the top of the uterus. The Paragard TCu 380a measures 32 mm (1.26") horizontally (top of the T), and 36 mm (1.42") vertically (leg of the T). Copper IUDs have a first year failure rate ranging from 0.1 to 2.2%. Copper IUDs primarily work by damaging sperm and disrupting their motility so that they are not able to join an egg. Copper acts as a spermicide within the uterus, increasing levels of copper ions, prostaglandins, and white blood cells within the uterine and tubal fluids. The increased copper ions in the cervical mucus inhibit the sperm's motility and viability, preventing sperm from traveling through the cervical mucus, or destroying it as it passes through. Copper can also alter the endometrial lining, but studies show that while this alteration can prevent implantation of a fertilized egg ("blastocyst"), it cannot disrupt one that has already been implanted.
Advantages of the copper IUD include its ability to provide emergency contraception up to five days after unprotected sex. It is the most effective form of emergency contraception available. It works by preventing fertilization or implantation but does not affect already implanted embryos. It contains no hormones, so it can be used while breastfeeding, and fertility returns quickly after removal. Copper IUDs also last longer and are available in a wider range of sizes and shapes compared to hormonal IUDs. Disadvantages include the possibility of heavier menstrual periods and more painful cramps.
IUDs that contain gold or silver also exist. Other shapes of IUD include the so-called U-shaped IUDs, such as the Load and Multiload, and the frameless IUD that holds several hollow cylindrical minuscule copper beads. It is held in place by a suture (knot) to the fundus of the uterus. It is mainly available in China, Europe, and Germany, although some clinics in Canada can provide it. A framed copper IUD called the IUB SCu300 coils when deployed and forms a three-dimensional spherical shape. It is based on a nickel titanium shape memory alloy core.
In addition to copper, noble metal and progestogen IUDs; people in China can get copper IUDs with indomethacin. This non-hormonal compound reduces the severity of menstrual bleeding, and these coils are popular.
Hormonal
Hormonal IUDs (brand names Mirena, Skyla, Kyleena, and Liletta; referred to as intrauterine systems in the UK) work by releasing a small amount of levonorgestrel, a progestin. Each type varies in size, amount of levonorgestel released, and duration. For example, Mirena and Liletta measure 32x32mm while Skyla and Kyleena measure 28x30mm. The primary mechanism of action is making the inside of the uterus difficult to sperm. They can also thin the endometrial lining and potentially impair implantation but this is not their usual function. Because they thin the endometrial lining, they can also reduce or even prevent menstrual bleeding. As a result, they are used to treat menorrhagia (heavy menses), once pathologic causes of menorrhagia (such as uterine polyps) have been ruled out.
The progestin released by hormonal IUDs primarily acts locally; use of Mirena results in much lower systemic progestin levels than other very-low-dose progestogen only contraceptives.
Mirena is approved for use up to five years in the US, though studies support its efficacy for up to seven years. Kyleena is similar to Mirena, but is smaller and releases slightly less levonorgestrel, but is still approved for up to 5 years. Skyla uses the same mechanism of action, but is even smaller and releases an even lower dose of levonorgestrel than Kyleena and is only approved for up to three years. Liletta is more similar to Mirena in both shape and dose of levonorgestrel released; it has currently been approved for usage up to three years.
Inert
Inert IUDs do not have a bioactive component. They are made of inert materials like stainless steel (such as the stainless steel ring (SSR), a flexible ring of steel coils that can deform to be inserted through the cervix) or plastic (such as the Lippes Loop, which can be inserted through the cervix in a cannula and takes a trapezoidal shape within the uterus). They are less effective than copper or hormonal IUDs, with a side effect profile similar to copper IUDs. Their primary mechanism of action is inducing a local foreign body reaction, which makes the uterine environment hostile both to sperm and to implantation of an embryo. They may have higher rates of preventing pregnancy after fertilization, instead of before fertilization, compared to copper or hormonal IUDs.
Inert IUDs are not yet approved for use in the United States, UK, or Canada. In China, where IUDs are the most common form of contraception, copper IUD production replaced inert IUD production in 1993. However, as of 2008, the most common IUD used by immigrants presenting to Canadian clinics for removal of IUDs placed in China was still the SSR. Because the SSR has no string for removal, it can present a challenge to healthcare providers unfamiliar with IUD types not available in their region.
Maps Intrauterine device
Adverse effects
Regardless of containing progestogen or copper, potential side effects of intrauterine devices are similar. They include changes in bleeding pattern, expulsion, pelvic inflammatory disease (especially in the first 21 days after insertion), and rarely uterine perforation. A small probability of pregnancy remains after IUD insertion, and when it occurs there's a greater risk of ectopic pregnancy.
Substantial pain with insertion that needs active management occurs in approximately 17% of nulliparous women and approximately 11% of parous women. In such cases, NSAIDs are effective. However, no prophylactic analgesic drug have been found to be effective for routine use for women undergoing IUD insertion.
Also, IUDs with progestogen confer an increased risk of ovarian cysts, and IUDs with copper confer an increased risk of heavier periods.
Menstrual cup companies recommend that women with IUDs who are considering using menstrual cups should consult with their gynecologists before use. There have been rare cases in which women using IUDs dislodged them when removing their menstrual cups, however, this can also happen with tampon use.
Unlike condoms, the IUD does not protect against sexually transmitted infections.
Mechanism
IUDs primarily work by preventing fertilization. The progestogen released from the hormonal IUDs may prevent ovulation from occurring but only partially. The hormone also thickens the cervical mucus so that sperm cannot reach the fallopian tubes. Copper IUDs contain no hormones, but the copper ions in the cervical mucus are toxic to sperm. They also cause the uterus and fallopian tubes to produce a fluid that contains white blood cells, copper ions, enzymes, and prostaglandins, a combination that is also toxic to sperm. The very high effectiveness of copper-releasing IUDs as emergency contraceptives implies they may also act by preventing implantation of the blastocyst. In non-emergency use, prevention of implantation is at most an exceptional method of action, not a typical mechanism of action.
History
The history of intrauterine devices dates back to the early 1900s. Unlike IUDs, early interuterine devices crossed both the vagina and the uterus, causing a high rate of pelvic inflammatory disease in a time period when gonorrhea was more common. The first IUD was developed in 1909 by the German physician Richard Richter, of Waldenburg. His device was made of silkworm gut and was not widely used.
Ernst Gräfenberg, another German physician (after whom the G-spot is named), created the first Ring IUD, Gräfenberg's ring, made of silver filaments. His work was suppressed during the Nazi regime, when contraception was considered a threat to Aryan women. He moved to the United States, where his colleagues H. Hall and M. Stone took up his work after his death and created the stainless steel Hall-Stone Ring. A Japanese doctor named Tenrei Ota also developed a silver or gold IUD called the Precea or Pressure Ring.
Jack Lippes helped begin the increase of IUD use in the United States in the late 1950s. In this time, thermoplastics, which can bend for insertion and retain their original shape, became the material used for first-generation IUDs. Lippes also devised the addition of the monofilament nylon string, which facilitates IUD removal. His trapezoid shape Lippes Loop IUD became one of the most popular first-generation IUDs. In the following years, many different shaped plastic IUDs were invented and marketed. These included the infamous Dalkon Shield, whose poor design caused bacterial infection and led to thousands of lawsuits. Although the Dalkon shield was removed from the market, it had a lasting, negative impact on IUD use and reputation in the United States. Lazar C. Margulies developed the first plastic IUD using thermoplastics in the 1960s. His innovation allowed insertion of the IUD into the uterus without the need to dilate the cervix.
The invention of the copper IUD in the 1960s brought with it the capital 'T' shaped design used by most modern IUDs. U.S. physician Howard Tatum determined that the 'T' shape would work better with the shape of the uterus, which forms a 'T' when contracted. He predicted this would reduce rates of IUD expulsion. Together, Tatum and Chilean physician Jaime Zipper discovered that copper could be an effective spermicide and developed the first copper IUD, TCu200. Improvements by Tatum led to the creation of the TCu380A (ParaGard), which is currently the preferred copper IUD.
The hormonal IUD was also invented in the 1960s and 1970s; initially the goal was to mitigate the increased menstrual bleeding associated with copper and inert IUDs. The first model, Progestasert, was conceived of by Antonio Scommengna and created by Tapani J. V. Luukkainen, but the device only lasted for one year of use. Progestasert was manufactured until 2001. One commercial hormonal IUD which is currently available, Mirena, was also developed by Luukkainen and released in 1976. The manufacturer of the Mirena, Bayer AG, became the target of multiple lawsuits over allegations that Bayer failed to adequately warn users that the IUD could pierce the uterus and migrate to other parts of the body.
China
In China, the mass use of IUDs by state health services was part of the government's efforts to limit birth rates. From 1980 to 2014, 324 million women were inserted with IUDs after having the first child, in addition to 107 million who were sterilized by tubal ligation after having the second child. Women who refused could lose their government employment and their children could lose access to public schools. The IUDs inserted in this way were modified such that they could not be removed in a doctor's office (meant to be left indefinitely), and surgical removal is usually needed. Until the mid-1990s, the state-preferred IUD was a stainless steel ring, which had a higher rate of complications compared to other types of IUD. It gave rise to the idiom "shang huan (pinyin of ??)" meaning "insert a loop". Nowadays, the IUDs include T and V shapes, the former being the most common and easiest to remove.
To implement the two-child policy, the government announced IUD-removals be paid for by the government. Women "who are allowed to have another child" (see one-child policy) or "who cannot continue to have the IUD for health reasons" get free removals, everyone else do not.
References
Source of the article : Wikipedia
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