Women (or their partners) who are allergic to latex should not use a latex<unk> <unk>  are associated with an increased risk of urinary tract infection (UTI) Urinating before inserting the<unk>  and also after intercourse, may reduce this risk. Toxic shock syndrome (TSS) occurs at a rate of 2.4 cases per 100,000 women using<unk> , almost exclusively when the device is left in place longer than 24 hours. The increase in risk of UTIs may be due to the<unk> applying pressure to the urethra, especially if the<unk> is too large, and causing irritation and preventing the bladder from emptying fully. However, the spermicide nonoxynol-9 is itself associated with increased risk of UTI, yeast infection, and bacterial vaginosis. For this reason, some advocate use of lactic acid or lemon juice based spermicides, which might have fewer side effects. It has also been suggested that, for women who experience side effects from nonoxynol-9, it may be acceptable to use the<unk> without any spermicide. One study found an actual pregnancy rate of 24% per year in women using the<unk> without spermicide; however, all women in this study were given a 60 mm<unk> rather than being fitted by a clinician. Other studies have been small and given conflicting results. The current recommendation is still for all<unk> users to use spermicide with the device. In the early 1920s, Marie Stopes claimed that when wearing a<unk>  the vagina is stretched such that certain movements made by the woman for the benefit of the man were restricted by the<unk> spring. In later years there was some discussion of this, with two authors supporting this concept and one opposed. One of them argued in the later 1920s-1930s that while the muscle movement by women is restricted it does not make all that much difference since most "women (in the 1920s) are not able to operate their pelvic muscles voluntarily to the best advantage" (during sex). However, Stopes anticipated this rebuttal, and in so many words classified it as a lame excuse.
Diaphragm 
Epigastrium
Thoracic diaphragm
Airtraq
Gumma 
Ainhum
Azasteroid
Hippus