Editing Diaphragm (birth control)

{{Short description|Cervical barrier type of birth control}}
{{Infobox Birth control
|name                 = Diaphragm
|image                = contraceptive diaphragm.jpg
|width                = 300
|caption              = An arcing spring diaphragm in its case, with a [[Quarter (United States coin)|quarter]] added for scale.
|bc_type              = Barrier
|date_first_use       = 1880s<ref name=Su2014/>
|rate_type            = Failure
|failure_measure      = first year with [[spermicide]]
|perfect_failure% = 6
|perfect_failure_ref =<ref name=Trus2011>{{cite book|last=Trussell|first=James|year=2011|chapter=Contraceptive efficacy|editor1-last=Hatcher|editor1-first=Robert A.|editor2-last=Trussell|editor2-first=James|editor3-last=Nelson|editor3-first=Anita L.|editor4-last=Cates|editor4-first=Willard Jr.|editor5-last=Kowal|editor5-first=Deborah|editor6-last=Policar|editor6-first=Michael S. |title=Contraceptive technology|edition=20th revised|location=New York|publisher=Ardent Media|isbn=978-1-59708-004-0|issn=0091-9721|oclc=781956734|pages=779–863|chapter-url=http://www.contraceptivetechnology.org/wp-content/uploads/2013/09/CTFailureTable.pdf|url-status=live|archive-url=https://web.archive.org/web/20131112130150/http://www.contraceptivetechnology.org/wp-content/uploads/2013/09/CTFailureTable.pdf|archive-date=2013-11-12}}</ref>
|typical_failure% = 12
|typical_failure_ref =<ref name=Trus2011/>
|duration_effect      =
|reversibility        = Immediate
|user_reminders       = Inserted before sex with spermicide.<br>Left in place for 6–8 hours afterwards
|clinic_interval      = For size fitting and prescribing in some countries
|STD_protection_YesNo = Possible
|periods              = Catches menstrual flow
|benefits             = May be reused 1 to 3 years
|weight_gain_loss     =
|risks                = Urinary tract infection, toxic shock syndrome (rare)
|medical_notes        =
}}
{{distinguish|female condom}}
<!-- Definition and medical uses -->
The '''diaphragm''' is a [[barrier contraception|barrier method]] of [[birth control]].<ref name=Hil2008>{{cite book|last1=Hillard|first1=Paula J. Adams|last2=Hillard|first2=Paula Adams|title=The 5-minute Obstetrics and Gynecology Consult|date=2008|publisher=Lippincott Williams & Wilkins|isbn=9780781769426|page=240|url=https://books.google.com/books?id=fOoFIQOdIhkC&pg=PA240|language=en|url-status=live|archive-url=https://web.archive.org/web/20170924000728/https://books.google.com/books?id=fOoFIQOdIhkC&lpg=PA240|archive-date=2017-09-24}}</ref> It is moderately effective, with a one-year failure rate of around 12% with typical use.<ref>{{cite book|last1=Wipf|first1=Joyce|title=Women's Health, An Issue of Medical Clinics of North America|date=2015|publisher=Elsevier Health Sciences|isbn=9780323376082|page=508|url=https://books.google.com/books?id=fJzuCQAAQBAJ&pg=PA508|language=en|url-status=live|archive-url=https://web.archive.org/web/20170924000728/https://books.google.com/books?id=fJzuCQAAQBAJ&pg=PA508|archive-date=2017-09-24}}</ref> It is placed over the [[cervix]] with [[spermicide]] before sex and left in place for at least six hours after sex.<ref name=CDC2016/><ref name=Helm2006>{{cite book|last1=Helms|first1=Richard A.|last2=Quan|first2=David J.|title=Textbook of Therapeutics: Drug and Disease Management|date=2006|publisher=Lippincott Williams & Wilkins|isbn=9780781757348|page=419|url=https://books.google.com/books?id=aVmRWrknaWgC&pg=PA429|language=en|url-status=live|archive-url=https://web.archive.org/web/20170924000728/https://books.google.com/books?id=aVmRWrknaWgC&lpg=PA429|archive-date=2017-09-24}}</ref> Fitting by a healthcare provider is generally required.<ref name=CDC2016>{{cite web|title=Contraception {{!}} Reproductive Health {{!}} CDC|url=https://www.cdc.gov/reproductivehealth/contraception/|website=www.cdc.gov|access-date=1 January 2017|date=21 June 2016|url-status=live|archive-url=https://web.archive.org/web/20170102081052/https://www.cdc.gov/reproductivehealth/contraception/|archive-date=2 January 2017}}</ref>

<!-- Side effects and mechanism -->
Side effects are usually very few.<ref name=Helm2006/> Use may increase the risk of [[bacterial vaginosis]] and [[urinary tract infections]].<ref name=Hil2008/> If left in the [[vagina]] for more than 24 hours [[toxic shock syndrome]] may occur.<ref name=Helm2006/> While use may decrease the risk of [[sexually transmitted infections]], it is not very effective at doing so.<ref name=Hil2008/> There are a number of types of diaphragms with different rim and spring designs.<ref name=Cor1995/> They may be made from [[latex]], [[silicone]], or [[natural rubber]].<ref name=Cor1995/> They work by blocking access to and holding spermicide near the cervix.<ref name=Cor1995>{{cite book|last1=Corson|first1=S. L.|last2=Derman|first2=R. J.|title=Fertility Control|date=1995|publisher=CRC Press|isbn=9780969797807|pages=211–212|url=https://books.google.com/books?id=30EzZPp1ypYC&q=Diaphragm%20latex%20silicone&pg=PA211|language=en|url-status=live|archive-url=https://web.archive.org/web/20170924000728/https://books.google.com/books?id=30EzZPp1ypYC&lpg=PA213&dq=Diaphragm%20latex%20silicone&pg=PA211|archive-date=2017-09-24}}</ref>

<!-- History, society and culture -->
The diaphragm came into use around 1882.<ref name=Su2014>{{cite book|last1=Everett|first1=Suzanne|title=Handbook of Contraception and Sexual Health|date=2014|publisher=Routledge|isbn=9781135114114|page=62|url=https://books.google.com/books?id=8j9FAwAAQBAJ&q=Diaphragm%20contraception%20history&pg=PA62|language=en|url-status=live|archive-url=https://web.archive.org/web/20170924000728/https://books.google.com/books?id=8j9FAwAAQBAJ&lpg=PA61&dq=Diaphragm%20contraception%20history&pg=PA62|archive-date=2017-09-24}}</ref> It is on the [[WHO Model List of Essential Medicines|World Health Organization's List of Essential Medicines]].<ref name="WHO21st">{{cite book | vauthors = ((World Health Organization)) | title = World Health Organization model list of essential medicines: 21st list 2019 | year = 2019 | hdl = 10665/325771 | author-link = World Health Organization | publisher = World Health Organization | location = Geneva | id = WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO | hdl-access=free }}</ref><ref name="WHO22nd">{{cite book | vauthors = ((World Health Organization)) | title = World Health Organization model list of essential medicines: 22nd list (2021) | year = 2021 | hdl = 10665/345533 | author-link = World Health Organization | publisher = World Health Organization | location = Geneva | id = WHO/MHP/HPS/EML/2021.02 | hdl-access=free }}</ref>

==Medical use==
Before inserting or removing a diaphragm, one's hands should be washed<ref name="pp">{{cite web|last=Johnson|first=Jennifer|title=Diaphragms, Caps, and Shields|publisher=Planned Parenthood|date=December 2005|url=http://www.plannedparenthood.org/birth-control-pregnancy/birth-control/diaphragms-caps-and-shields.htm|access-date=2006-10-15|url-status=dead|archive-url=https://web.archive.org/web/20061012053633/http://www.plannedparenthood.org/birth-control-pregnancy/birth-control/diaphragms-caps-and-shields.htm|archive-date=2006-10-12}}</ref> to avoid introducing harmful bacteria into the vaginal canal.

The rim of a diaphragm is squeezed into an oval or arc shape for insertion. A water-based lubricant (usually spermicide) may be applied to the rim of the diaphragm to aid insertion.  One [[teaspoon]] (5 [[Litre|mL]]) of [[spermicide]] may be placed in the dome of the diaphragm before insertion, or with an applicator after insertion.<ref name="afp">{{cite journal|last=Allen|first=Richard|title=Diaphragm Fitting|journal=American Family Physician|volume=69|issue=1|date=January 2004|url=http://www.aafp.org/afp/20040101/97.html|access-date=2006-10-15|pmid=14727824|pages=97–100|url-status=live|archive-url=https://web.archive.org/web/20070929100035/http://www.aafp.org/afp/20040101/97.html|archive-date=2007-09-29}}</ref>

The diaphragm must be inserted sometime before [[sexual intercourse]], and remain in the vagina for 6 to 8 hours after a man's last ejaculation.<ref name="fwhc">{{cite web|title=Diaphragm|publisher=Feminist Women's Health Center|date=January 2006|url=http://www.fwhc.org/birth-control/diaphram.htm|access-date=2006-10-15|url-status=dead|archive-url=https://web.archive.org/web/20061020084323/http://www.fwhc.org/birth-control/diaphram.htm|archive-date=2006-10-20}}</ref> For multiple acts of intercourse, it is recommended that an additional 5 mL of spermicide be inserted into the vagina (not into the dome—the seal of the diaphragm should not be broken) before each act. Upon removal, a diaphragm should be cleansed with mild soap and warm water before storage. The diaphragm must be removed for cleaning at least once every 24 hours<ref name="afp" /> and can be re-inserted immediately.

Oil-based products should not be used with latex diaphragms. Lubricants or vaginal medications that contain oil will cause the latex to rapidly degrade and greatly increases the chances of the diaphragm breaking or tearing.<ref name="fwhc" />

Natural latex rubber will degrade over time. Depending on usage and storage conditions, a latex diaphragm should be replaced every one to three years.<ref name="OrthoPI">{{cite press release|publisher=Ortho-McNeil Pharmaceutical|year=2004|url=http://www.ortho-mcneilpharmaceutical.com/ortho-mcneilpharmaceutical/shared/pi/diaph_patient.pdf#zoom=100|format=PDF|title=After your doctor or health care provider prescribes your Ortho diaphragm|access-date=2007-07-22|url-status=dead|archive-url=https://web.archive.org/web/20070926084423/http://www.ortho-mcneilpharmaceutical.com/ortho-mcneilpharmaceutical/shared/pi/diaph_patient.pdf#zoom=100|archive-date=2007-09-26}}</ref><ref name="old method">{{cite journal|author1=S. Marie Harvey |author2=Sheryl Thorburn Bird |author3=Meredith Roberts Branch |title=A New Look at an Old Method: The Diaphragm| journal=Perspectives on Sexual and Reproductive Health|volume=35|issue=6|date=November–December 2004|doi=10.1363/3527003|pages=270–3|pmid=14744659}}</ref>  Silicone diaphragms may last much longer—up to ten years.

===Effectiveness===
The effectiveness of diaphragms, as of most forms of [[contraception]], can be assessed two ways: ''method effectiveness'' and ''actual effectiveness''.  The method effectiveness is the proportion of couples correctly and consistently using the method who do not become pregnant. Actual effectiveness is the proportion of couples who intended that method as their sole form of birth control and do not become pregnant; it includes couples who sometimes use the method incorrectly, or sometimes not at all. Rates are generally presented for the first year of use. Most commonly the [[Pearl Index]] is used to calculate effectiveness rates, but some studies use [[decrement table]]s.

For all forms of contraception, actual effectiveness is lower than method effectiveness, due to several factors:

* mistakes on the part of those providing instructions on how to use the method
* mistakes on the part of the method's users
* conscious user non-compliance with method

For instance, someone using a diaphragm might be fitted incorrectly by a health care provider, or by mistake remove the diaphragm too soon after intercourse, or simply choose to have intercourse without placing the diaphragm.

''Contraceptive Technology'' reports that the method failure rate of the diaphragm with spermicide is 6% per year.<ref name="hatcher">{{cite book|first=RA|last=Hatcher|author2=Trussel J|author3=Stewart F|year=2000|title=Contraceptive Technology|edition=18th|publisher=Ardent Media|location=New York|isbn=978-0-9664902-6-8|url=http://www.contraceptivetechnology.com/table.html|display-authors=etal|url-status=live|archive-url=https://web.archive.org/web/20080531095926/http://www.contraceptivetechnology.com/table.html|archive-date=2008-05-31}}</ref>

The actual pregnancy rates among diaphragm users vary depending on the population being studied, with yearly rates of 10%<ref>{{cite journal|author1=Bulut A |title=Assessing the acceptability, service delivery requirements, and use-effectiveness of the diaphragm in Colombia, Philippines, and Turkey|journal=Contraception|volume=63|issue=5|pages=267–75|year=2001|pmid=11448468| doi=10.1016/S0010-7824(01)00204-9|last2=Ortayli|last3=Ringheim|last4=Cottingham|last5=Farley|last6=Peregoudov|last7=Joanis|last8=Palmore|last9=Brady|last10=Diaz|last11=Ojeda|last12=Ramos}}</ref> to 39%<ref>{{cite book|first=John|last=Kippley|author2=Sheila Kippley|year=1996|title=The Art of Natural Family Planning|edition=4th addition|publisher=The Couple to Couple League|location=Cincinnati, Ohio|isbn=978-0-926412-13-2|pages=146}}, which cites:<br>
:{{cite journal|last=Guttmacher Institute|title=Choice of Contraceptives|journal=The Medical Letter on Drugs and Therapeutics|volume=34|pages=111–114|year=1992|pmid= 1448019|issue=885}}</ref> being reported.

Unlike some other cervical barriers, the effectiveness of the diaphragm is the same for women who have given birth as for those who have not.<ref>{{cite journal| author1=Trussell J |author2=Strickler J |author3=Vaughan B|title=Contraceptive efficacy of the diaphragm, the sponge and the cervical cap|journal=Fam Plann Perspect|volume=25|issue=3| pages=100–5, 135|year=1993|pmid=8354373|doi=10.2307/2136156|jstor=2136156 }}</ref>

===Advantages===
The diaphragm does not interfere with a woman's menstrual cycle, therefore, no reversal or waiting time is necessary if contraception is no longer wanted or needed.

The diaphragm only has to be used during intercourse. Many women, especially those who have sex less frequently, prefer [[barrier contraception]] such as the diaphragm over methods that require some action every day.<ref name="pp" />

Like all cervical barriers, diaphragms may be inserted several hours before use, allowing uninterrupted foreplay and intercourse. Most couples find that neither partner can feel the diaphragm during intercourse.

The diaphragm is less expensive than many other methods of contraception.<ref name="afp" />

===Sexually transmitted infections===
There is some evidence that the cells in the cervix are particularly susceptible to certain [[Sexually transmitted disease|sexually transmitted infections]] (STIs).  Cervical barriers such as diaphragms may offer some protection against these infections.<ref name="old method" /> However, research conducted to test whether the diaphragm offers protection from HIV found that women provided with both male [[condoms]] and a diaphragm experienced the same rate of [[HIV]] infection as women provided with male condoms alone.<ref name="new role">{{cite web|title=QUESTIONS & ANSWERS: The MIRA Diaphragm Trial Results|url=http://www.cervicalbarriers.org/documents/MIRA_QA-7-12.doc|format=DOC|publisher=Cervical Barrier Advancement Society|date=July 2007|access-date=2007-07-22|url-status=live|archive-url=https://web.archive.org/web/20070802070004/http://www.cervicalbarriers.org/documents/MIRA_QA-7-12.doc|archive-date=2007-08-02}}</ref>

Because [[pelvic inflammatory disease]] (PID) is caused by certain STIs, diaphragms may lower the risk of PID.<ref>{{cite journal|last=J|first=Kelaghan|author2= G.L. Rubin, H.W. Ory and P.M. Layde|date=July 1982|title=Barrier-method contraceptives and pelvic inflammatory disease|journal=Journal of the American Medical Association |volume=248|issue=2|pages=184–187|doi=10.1001/jama.248.2.184|pmid=7087109}}</ref> Cervical barriers may also protect against [[human papillomavirus]] (HPV), the virus that causes [[cervical cancer]], although the protection appears to be due to the spermicide used with diaphragms and not the barrier itself.<ref>{{cite journal| author=Hildesheim A |title=Barrier and spermicidal contraceptive methods and risk of invasive cervical cancer |journal=Epidemiology|volume=1|issue=4|pages=266–72|year=1990|pmid=2083303|doi=10.1097/00001648-199007000-00003|last2=Brinton |last3=Mallin |last4=Lehman |last5=Stolley |last6=Savitz |last7=Levine |s2cid=30392531 }}</ref>

Diaphragms are also considered a good candidate as a delivery method for [[microbicide]]s (preparations that, used vaginally, protect against STIs) that are currently in development.<ref name="old method" />

==Side effects==
Women (or their partners) who are allergic to [[latex]] should not use a latex diaphragm.

Diaphragms are associated with an increased risk of [[urinary tract infection]] (UTI).<ref>{{cite journal|author=Fihn S| title=Association between diaphragm use and urinary tract infection|journal=JAMA|volume=254|issue=2|pages=240–5|year=1985|pmid=3999367|doi= 10.1001/jama.254.2.240| last2=Latham| last3=Roberts| last4=Running| last5=Stamm}}<br>{{cite journal|author=Heaton C, Smith M|title=The diaphragm|journal=Am Fam Physician|volume=39|issue=5|pages=231–6|year=1989|pmid=2718900|last2=Smith}}</ref> Urinating before inserting the diaphragm, and also after intercourse, may reduce this risk.<ref name="pp" />

[[Toxic shock syndrome]] (TSS) occurs at a rate of 2.4 cases per 100,000 women using diaphragms, almost exclusively when the device is left in place longer than 24&nbsp;hours.<ref name="afp" />

The increase in risk of UTIs may be due to the diaphragm applying pressure to the [[urethra]], especially if the diaphragm 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, [[Candidiasis|yeast infection]], and [[bacterial vaginosis]].<ref>{{cite web|title=Drug Information: Nonoxynol-9 cream, film, foam, gel, jelly, suppository|work=Medical University of South Carolina|date=March 2006|url=http://www.muschealth.com/cds/CPDrugInfo.details.aspx?cpnum=1477&language=english|archive-url=https://web.archive.org/web/20071012161848/http://muschealth.com/cds/CPDrugInfo.details.aspx?cpnum=1477&language=english|url-status=dead|archive-date=2007-10-12|access-date=2006-08-06}}</ref> For this reason, some advocate use of lactic acid or lemon juice based spermicides, which might have fewer side effects.<ref>{{cite web  |title=Natural Spermicides and Femprotect  |work=Ovusoft.com Message Boards  |date=June 2003  |url=http://forums.ovusoft.com/tm.asp?m=1508226&p=1&tmode=6  |access-date=2006-10-17  }}{{dead link|date=September 2017 |bot=Level C |fix-attempted=yes }}<br>
{{cite web  |title=Femprotect - Lactic Acid Contraceptive Gel  |work=Woman's Natural Health Practice  |url=http://www.naturalgynae.com/nav6_fact19.html  |access-date=2006-09-17  |archive-url=https://web.archive.org/web/20060601030433/http://www.naturalgynae.com/nav6_fact19.html  |archive-date=2006-06-01  |url-status=dead  }}<br></ref>

In the early 1920s, [[Marie Stopes]] claimed that when wearing a diaphragm, the vagina is stretched such that certain movements made by the woman for the benefit of the man were restricted by the diaphragm 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.<ref>cook, Hera: The long sexual revolution: English women, sex and contraception 1800-1975.  Oxford University Press, 2004, pp. 247-8</ref>

== Use without spermicide ==
It has been suggested that, for women who experience side effects from the spermicide nonoxynol-9, it may be acceptable to use the diaphragm without any spermicide. One study found an actual pregnancy rate of 24% per year in women using the diaphragm without spermicide; however, all women in this study were given a 60 mm diaphragm rather than being fitted by a clinician.<ref>{{cite journal |last=Smith, C.; Farr, G.; Feldblum, PJ.; Spence, A. |year=1995 |title=Effectiveness of the non-spermicidal fit-free diaphragm |url=https://pubmed.ncbi.nlm.nih.gov/7628202/ |journal=Contraception |volume=51 |issue=5 |pages=289–291 |doi=10.1016/0010-7824(95)00075-l |pmid=7628202 |via=}}</ref> Other studies have been small and given conflicting results.<ref>{{cite journal |author=Ferreira A A |last2=Araújo |last3=Regina |last4=Diniz |last5=Faúndes |year=1993 |title=Effectiveness of the diaphragm, used continuously, without spermicide |journal=Contraception |volume=48 |issue=1 |pages=29–35 |doi=10.1016/0010-7824(93)90063-D |pmid=8403903}}</ref><ref>{{cite journal |author=Bounds W |last2=Guillebaud |last3=Dominik |last4=Dalberth |year=1995 |title=The diaphragm with and without spermicide. A randomized, comparative efficacy trial |journal=J Reprod Med |volume=40 |issue=11 |pages=764–74 |pmid=8592310}}</ref><ref>{{Cite web |last=Linton, A.; Kiley, J. |date=January 2017 |title=Use and Effectiveness of Barrier and Spermicidal Contraceptive Methods {{!}} GLOWM |url=http://beta.glowm.com/section-view/heading/Use%20and%20Effectiveness%20of%20Barrier%20and%20Spermicidal%20Contraceptive%20Methods/item/384 |access-date=2024-08-12 |website=The Global Library of Women's Medicine |language=en |doi=}}</ref> Insufficient studies have been conducted to conclusively determine effectiveness without spermicide.<ref name=":0">{{Cite journal |last1=Cook |first1=L. |last2=Nanda |first2=K. |last3=Grimes |first3=D. |date=2002 |title=Diaphragm versus diaphragm with spermicides for contraception |journal=The Cochrane Database of Systematic Reviews |volume=2011 |issue=3 |pages=CD002031 |doi=10.1002/14651858.CD002031 |issn=1469-493X |pmc=8411872 |pmid=12137639}}</ref><ref>{{Cite journal |last=Cook, L.; Nanda, K.; Grimes, D. |date=2002-04-01 |title=The diaphragm with and without spermicide for contraception: a Cochrane review |url=https://doi.org/10.1093/humrep/17.4.867 |journal=Human Reproduction |volume=17 |issue=4 |pages=867–869|doi=10.1093/humrep/17.4.867 }}</ref>{{Update inline|reason=Updated version https://www.ncbi.nlm.nih.gov/pubmed/12535422|date=July 2018}} The current recommendation is still for all diaphragm users to use spermicide with the device.<ref name=":0" /> 

==Types==
Diaphragms are available in diameters of 50&nbsp;mm to 105mm (about 2–4&nbsp;inches). They are available in two different materials: [[latex]] and [[silicone]]. Diaphragms are also available with different types of springs in the rim.<ref name="cbas diaphragm">{{cite web |title=Diaphragms |work=Cervical Barrier Advancement Society |year=2000 |url=http://www.cervicalbarriers.org/information/diaphragms.cfm |access-date=2006-10-18 |url-status=live |archive-url=https://web.archive.org/web/20061005063906/http://www.cervicalbarriers.org/information/diaphragms.cfm |archive-date=2006-10-05 }}</ref>

An ''arcing spring'' folds into an arc shape when the sides are compressed. This is the strongest type of rim available in a diaphragm, and may be used by women with any level of vaginal tone. Unlike other spring types, arcing springs may be used by women with mild [[cystocele]], [[rectocele]], or [[Retroverted uterus|retroversion]].<ref name="owh">{{cite web |title=Diaphragms |work=Ortho Women's Health |publisher=Ortho-McNeil Pharmaceutical |year=2001 |url=http://www.orthowomenshealth.com/products/diaphragmsprods.html |access-date=2006-10-18 |url-status=dead |archive-url=https://web.archive.org/web/20061016162727/http://www.orthowomenshealth.com/products/diaphragmsprods.html |archive-date=2006-10-16 }}</ref> Arcing spring diaphragms may be easier to insert correctly than other spring types.<ref>{{cite journal|title=Women find arcing-spring diaphragm easier to insert, studies indicate|journal=Contracept Technol Update|volume=7|issue=4|pages=41–2|year=1986|pmid=12340681}}</ref>

A ''coil spring'' flattens into an oval shape when the sides are compressed. This rim is not as strong as the arcing spring, and may only be used by women with average or firm vaginal tone.<ref name="afp" /> If an arcing spring diaphragm is uncomfortable for a woman or, during intercourse, her partner, a coil spring may prove more satisfactory. Unlike the arcing spring diaphragms, coil springs may be inserted with a device called an introducer.

A ''flat spring'' is much like a coil spring, but thinner. This type of rim may only be used by women with firm vaginal tone. Flat spring diaphragms may also be inserted with an introducer for women uncomfortable using their hands.<ref name="afp" /> Ortho used to manufacture a flat-spring diaphragm called the Ortho White.<ref name="fpn">{{cite web|title=Contraceptive Diaphragm|work=Family Practice Notebook|year=2000|url=http://www.fpnotebook.com/GYN14.htm|access-date=2006-10-18|archive-url= https://web.archive.org/web/20060902071412/http://www.fpnotebook.com/GYN14.htm|archive-date=2006-09-02}}</ref> Reflexions also manufactured a flat-spring diaphragm up until 2014.<ref name="cbas diaphragm" /><ref name="owh" />

There are a number of variations. The SILCS diaphragm is made of silicone, has an arcing spring, and a finger cup is molded on one end for easy removal. The Duet [[disposable]] diaphragm is made of dipped polyurethane, pre-filled with [[BufferGel]] (BufferGel is currently in clinical trials as a spermicide and [[Microbicides for sexually transmitted diseases|microbicide]]).<ref name="cbas diaphragm"/> Both the SILCS and Duet diaphragms come in only one size.

===Fitting===
[[Image:Fem isa 3.gif|thumb|upright=1.4|1: [[urinary bladder|bladder]], 2: [[Pubis (bone)|pubic bone]], 3: [[urethra]], 4: [[vagina]], 5: [[uterus]], 6: [[Fornix vaginae|fornix]], 7: [[cervix]], 8: '''diaphragm''', 9: [[rectum]]]]
Diaphragms usually come in different sizes and require a fitting appointment with a health care professional to determine which size a woman should wear.  Single size diaphragms that do not require fitting also exist.<ref>{{cite web|title=A new kind of diaphragm|year=2015|url=http://www.path.org/projects/silcs.php|access-date=2015-11-08|url-status=dead|archive-url=https://web.archive.org/web/20151026065737/http://www.path.org/projects/silcs.php|archive-date=2015-10-26}}</ref>

A correctly fitting diaphragm will cover the [[cervix]] and rest snugly against the [[Pubis (bone)|pubic bone]]. A diaphragm that is too small might fit inside the vagina without covering the cervix, or might become dislodged from the cervix during intercourse or bowel movements.<ref name="afp" /> It is also more likely that a woman's partner will feel the anterior rim of a diaphragm that is too small during intercourse. A diaphragm that is too large will place pressure on the [[urethra]], preventing the bladder from emptying completely and increasing the risk of [[urinary tract infection]].<ref name="afp" /> A diaphragm that is too large may also cause a sore to develop on the vaginal wall.<ref>{{cite web|title=Diaphragms: Management of Side Effects|work=PocketGuide for Family Planning Service Providers: Barriers and Spermicides|publisher=Reproductive Health Online|year=2003|url=http://www.reproline.jhu.edu/English/6read/6multi/pg/barr7.htm#Vaginal%20lesion|access-date=2007-09-15|url-status=live|archive-url=https://web.archive.org/web/20070416010609/http://www.reproline.jhu.edu/english/6read/6multi/pg/barr7.htm#Vaginal%20lesion|archive-date=2007-04-16}}</ref>

Diaphragms should be re-fitted after a weight change of 4.5&nbsp;kg (10&nbsp;lb) or more.<ref name="fwhc" /> The traditional clinical guideline is that a decrease in weight may cause a woman to need a larger size, although the strength of this relationship has been questioned.<ref>{{cite journal|author=Kugel C, Verson H|title= Relationship between weight change and diaphragm size change|journal=Journal of Obstetric, Gynecologic, & Neonatal Nursing|volume=15|issue=2|pages= 123–9|year=1986|pmid=3517255|doi=10.1111/j.1552-6909.1986.tb01377.x|last2= Verson}}<br>
{{cite journal|author=Fiscella K|title=Relationship of weight change to required size of vaginal diaphragm |journal=The Nurse Practitioner|volume=7|issue=7|pages=21, 25| year=1982|pmid=7121900|doi=10.1097/00006205-198207000-00004}}</ref>

Diaphragms should also be re-fitted after any pregnancy of 14 weeks or longer.<ref name="pp" /> Full-term vaginal delivery especially will tend to increase the size diaphragm a woman needs, although the changes to the [[pelvic floor]] during pregnancy mean even women who experience second-trimester miscarriage, or deliver by [[Caesarean section|C-section]], should be refitted.

''Vaginal tenting'', an increase in the length of the vagina, occurs during arousal. This means that during intercourse, the diaphragm will not fit snugly against the pubic bone because it is carried higher up the vaginal canal by the movement of the cervix. If the diaphragm is inserted after arousal has begun, extra care must be taken to ensure the device is covering the cervix.<ref name="OrthoPI" />

A woman might be fitted with a different size diaphragm depending on where she is in her [[menstrual cycle]]. It is common for a woman to wear a larger diaphragm during menstruation. It has been speculated that a woman may be fitted with a larger size diaphragm when she is near [[ovulation]].<ref name="tcoyf">{{cite book|first= Toni|last=Weschler|year=2002|title=Taking Charge of Your Fertility|url= https://archive.org/details/takingchargeofyo00toni|url-access= registration|pages=[https://archive.org/details/takingchargeofyo00toni/page/232 232]|edition=Revised|publisher=HarperCollins|location=New York|isbn=978-0-06-093764-5}}</ref> The correct size for a woman is the largest size that she can wear comfortably throughout her cycle.

In the United States, diaphragms are available by [[Medical prescription|prescription]] only. Many other countries do not require prescriptions.

==Mechanism of action==
The spring in the rim of the diaphragm forms a seal against the vaginal walls. The diaphragm covers the [[cervix]], and physically prevents sperm from entering the [[uterus]] through the [[external orifice of the uterus|cervical canal]].

Traditionally, the diaphragm has been used with spermicide, and it is widely believed that the spermicide is a significant factor in the effectiveness of the diaphragm. However, some have asserted that the diaphragm's mechanism of action is primarily as a physical barrier and that a diaphragm is effective without spermicides, but insufficient studies have been conducted to prove this.<ref name=":0" />{{Update inline|reason=Updated version https://www.ncbi.nlm.nih.gov/pubmed/12535422|date = July 2018}}

It is widely taught that additional spermicide must be placed in the vagina if intercourse occurs more than six hours after insertion.<ref name="pp" /><ref name="OrthoPI" />  However, there has been very little research on how long spermicide remains active within the diaphragm. One study found that spermicidal jelly and creme used in a diaphragm retained its full spermicidal activity for twelve hours after placement of the diaphragm.<ref>{{cite journal|author=Leitch W|title=Longevity of Ortho Creme and Gynol II in the contraceptive diaphragm|journal=Contraception|volume=34|issue=4|pages=381–93|year=1986|pmid=3780236|doi=10.1016/0010-7824(86)90090-9}}</ref>

It has long been recommended that the diaphragm be left in place for at least six or eight hours after intercourse. No studies have been done to determine the validity of this recommendation, however, and some medical professionals have suggested intervals of four hours<ref>{{cite journal|author=Kovacs G|title=Fitting a diaphragm| journal=Aust Fam Physician|volume=19|issue=5|pages=713, 716|year=1990|pmid=2346425}}</ref> or even two hours<ref>{{cite journal|author=Bernstein G|title=Is effectiveness of diaphragm compromised by postcoital swimming or bathing?|journal=JAMA|volume=237|issue=3|pages=2643–2644|year=1977|pmid=12259737|doi= 10.1001/jama.237.24.2643}}</ref> are sufficient to ensure efficacy. One manufacturer of [[contraceptive sponge]]s recommends leaving the sponge in place for only two hours after intercourse.<ref name="CBAS">{{cite web|title=Sponges |work=Cervical Barrier Advancement Society |year=2004 |url=http://www.cervicalbarriers.org/information/sponges.cfm |access-date=2006-09-17 |url-status=dead |archive-url=https://web.archive.org/web/20090114062634/http://www.cervicalbarriers.org/information/sponges.cfm |archive-date=2009-01-14 }}</ref> However, such use of the diaphragm (removal before 6 hours post-intercourse) has never been formally studied, and cannot be recommended.

It has been suggested that diaphragms be dispensed as a one-size-fits-all device, providing all women with the most common size (70&nbsp;mm). However, only 33% of women fitted for a diaphragm are prescribed a 70&nbsp;mm size, and correct sizing of the diaphragm is widely considered necessary.<ref>{{cite journal|author=Mauck C |title=Diaphragms in clinical trials: is clinician fitting necessary?|journal=Contraception|volume=69|issue=4|pages=263–6|year=2004|pmid=15033398|doi= 10.1016/j.contraception.2003.11.006|last2=Lai|last3=Schwartz|last4=Weiner}}</ref>

==History==
[[File:Die Frau als Hausärztin (1911) 155 Occlusiv-Pessar.png|thumb|Mensinga “occlusive pessary” (1911)]]
[[File:Photo_of_Contraceptive_Diaphragm.jpg|thumb|Photo of Caya diaphragm]]
The idea of blocking the cervix to prevent pregnancy is thousands of years old.  Various cultures have used cervix-shaped devices such as oiled paper cones or [[lemon]] halves, or have made sticky mixtures that include [[honey]] or [[cedar (plant)|cedar]] [[resin]] to be applied to the [[External orifice of the uterus|cervical opening]].<ref name="pp2">{{cite web|title=A History of Birth Control Methods|work=Planned Parenthood|date=June 2002|url=http://www.plannedparenthood.org/files/PPFA/history_bc_methods.pdf|access-date=2010-12-16|url-status=live|archive-url=https://web.archive.org/web/20101214142126/http://www.plannedparenthood.org/files/PPFA/history_bc_methods.pdf|archive-date=2010-12-14}}</ref> However, the diaphragm—which stays in place because of the spring in its rim, rather than hooking over the cervix or being sticky—is of more recent origin.

An important precursor to the invention of the diaphragm was the rubber [[vulcanization]] process, patented by [[Charles Goodyear]] in 1844. In the 1880s, a [[Germany|German]] gynecologist, Wilhelm P. J. Mensinga, published the first description of a rubber contraceptive device with a spring molded into the rim. Mensinga wrote first under the pseudonym C. Hasse, and the Mensinga diaphragm was the only brand available for many decades.<ref>Über die facultative Sterilität vom prophylaktischen und hygienischen Standpunkt (Pseudonym C. Hasse), Verlag Louis Heuser, Neuwied/Berlin 1882</ref><ref>Aus dem ärztlichen Leben. Ratgeber für angehende und junge Ärzte (Pseudonym C.Hasse), Verlag Otto Borghold, 1886</ref><ref name="evolution">{{cite journal|date=February 2000|title=Evolution and Revolution: The Past, Present, and Future of Contraception|journal=Contraception Online (Baylor College of Medicine)|volume=10|issue=6|url=http://ssai-starss.com|url-status=dead|archive-url=https://web.archive.org/web/20140222195427/http://ssai-starss.com/|archive-date=2014-02-22|access-date=2017-09-24}}</ref> In the United States, the physician Edward Bliss Foote designed and sold an early form of occlusive pessary under the name "[[womb veil]]" starting in the 1860s.<ref>Robert Jütte, ''Contraception: A History'' (Polity Press, 2008, originally published in German 2003), p. 154; Andrea Tone, ''Devices and Desires: A History of Contraceptives in America'' (MacMillan, 2001), p. 57 [https://books.google.com/books?id=ClHpjlw8zQEC&dq=%22womb+veil%22+%22edward+bliss+foote%22+inauthor%3Atone&pg=PA57 online] {{webarchive|url=https://web.archive.org/web/20160613155750/https://books.google.com/books?id=ClHpjlw8zQEC&pg=PA57&dq=%22womb+veil%22+%22edward+bliss+foote%22+inauthor%3Atone&lr=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&as_brr=3&cd=1 |date=2016-06-13 }};</ref>

American birth control activist [[Margaret Sanger]] fled to Europe in 1914 to escape prosecution under the [[Comstock Act of 1873|Comstock laws]], which prohibited sending contraceptive devices, or information about contraception, through the mail. Sanger learned about the diaphragm in the [[Netherlands]] and introduced the product to the [[United States]] when she returned in 1916. Sanger and her second husband, Noah Slee, illegally imported large quantities of the devices from Germany and the Netherlands. In 1925, Slee provided funding to Sanger's friend Herbert Simonds, who used the funds to found the first diaphragm manufacturing company in the U.S., the Holland-Rantos Company.<ref name="pp2" /><ref name="note">{{cite web|title=Biographical Note|work=The Margaret Sanger Papers|publisher=Sophia Smith Collection, Smith College|location=Northampton, Mass|year=1995|url=http://asteria.fivecolleges.edu/findaids/sophiasmith/mnsss43_bioghist.html|access-date=2006-10-21|url-status=live|archive-url=https://web.archive.org/web/20060912180741/http://asteria.fivecolleges.edu/findaids/sophiasmith/mnsss43_bioghist.html|archive-date=2006-09-12}}</ref>

Diaphragms played a role in overturning the federal [[Comstock Act of 1873]]. In 1932, Sanger arranged for a Japanese manufacturer to mail a package of diaphragms to a New York physician who supported Sanger's activism. U.S. Customs confiscated the package and Sanger helped file a lawsuit. In 1936, in the court case ''[[United States v. One Package of Japanese Pessaries]]'', a federal appellate court ruled that the package could be delivered.<ref name="pp2" />

Although in Europe, the [[cervical cap]] was more popular than the diaphragm, the diaphragm became one of the most widely used contraceptives in the United States. In 1940, one-third of all U.S. married couples used a diaphragm for contraception. The number of women using diaphragms dropped dramatically after the 1960s introduction of the [[intrauterine device]] and the [[combined oral contraceptive pill]]. In 1965, only 10% of U.S. married couples used a diaphragm for contraception.<ref name="evolution" /> That number has continued to fall, and in 2002 only 0.2% of American women were using a diaphragm as their primary method of contraception.<ref>{{cite journal|last=Chandra|first=A|author2=Martinez GM|author3=Mosher WD|author4=Abma JC|author5=Jones J.|title=Fertility, Family Planning, and Reproductive Health of U.S. Women: Data From the 2002 National Survey of Family Growth|journal=Vital and Health Statistics|volume=23|issue=25|year=2005|url=https://www.cdc.gov/nchs/data/series/sr_23/sr23_025.pdf|access-date=2007-05-20|url-status=live|archive-url=https://web.archive.org/web/20070630135904/http://www.cdc.gov/nchs/data/series/sr_23/sr23_025.pdf|archive-date=2007-06-30}} See Table 56.</ref>

In 2014 [[Janssen Pharmaceuticals]] announced the discontinuation of the Ortho-All Flex Diaphragm, making it very difficult for women in the U.S. to have that option as a birth-control method.<ref>{{cite web |url=http://www.cervicalbarriers.org/products/diaphragms.cfm |title=Diaphragms |access-date=2016-05-26 |url-status=live |archive-url=https://web.archive.org/web/20160309212223/http://www.cervicalbarriers.org/products/diaphragms.cfm |archive-date=2016-03-09 }}</ref><ref>[http://www.tbtam.com/2014/04/ortho-diaphragm-discontinued.html#.U9vFe61dXTw Ortho Diaphragm Discontinued | The Blog That Ate Manhattan<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20140810222243/http://www.tbtam.com/2014/04/ortho-diaphragm-discontinued.html |date=2014-08-10 }}</ref>{{Unreliable source?|date=August 2014}}

The single-sized, silicone diaphragm was developed by [[PATH (global health organization)|PATH]] during the late 2000s. It was licensed to Kessel Marketing & Vertriebs GmbH of Frankfurt, Germany, which began to market it as the Caya Diaphragm. The diaphragm was approved for contraception in Europe in 2013 and in the United States the following year.<ref>{{cite web |url=http://www.path.org/projects/silcs.php |title=A new kind of diaphragm |access-date=2015-11-08 |url-status=dead |archive-url=https://web.archive.org/web/20151026065737/http://www.path.org/projects/silcs.php |archive-date=2015-10-26 }}</ref>  Since then, Kessel has also developed a traditionally circular, multi-sized diaphragm made from the same materials that they released in Germany in 2020 under the name Singa.<ref>{{Cite web|date=2019-12-03|title=Singa®: distribution of the new diaphragm|url=https://www.medintim.de/singa-distribution-of-the-new-diaphragm/?lang=en/|access-date=2020-08-14|website=Medintim|language=en-US}}</ref><ref>{{Cite web|title=NEU! das Singa diaphragm|url=https://www.medintim.de/neu-singa-diaphragm/|access-date=August 13, 2020|website=Medintim}}</ref>

== Society and culture ==
=== Economics ===
In the United Kingdom, they cost the [[National Health Service]] less than £10 each.<ref name=BNF69>{{cite book|title=British national formulary : BNF 69|date=2015|publisher=British Medical Association|isbn=9780857111562|page=559|edition=69}}</ref> In the United States, they cost about US$15 to $75 and are the birth control method of 0.3% of women.<ref name=Sh2011>{{cite book|last1=Shoupe|first1=Donna|title=Contraception|date=2011|publisher=John Wiley & Sons|isbn=9781444342635|page=15|url=https://books.google.com/books?id=ksjJcx1CeKcC&q=Diaphragm%20contraception%20cost%20united%20states&pg=PA15|language=en}}</ref> These costs do not include that of spermicide.<ref>{{cite book|last1=Alexander|first1=Linda|last2=LaRosa|first2=Judith|title=New Dimensions In Women's Health|date=2009|publisher=Jones & Bartlett Learning|isbn=9780763765927|page=94|url=https://books.google.com/books?id=2X03PXd4JSoC&q=Diaphragm%20contraception%20millions&pg=PA94|language=en|url-status=live|archive-url=https://web.archive.org/web/20170924000728/https://books.google.com/books?id=2X03PXd4JSoC&lpg=PA94&dq=Diaphragm%20contraception%20millions&pg=PA94|archive-date=2017-09-24}}</ref>

== References ==
{{Reflist}}

==Further reading==
*{{Cite news | first=Olivia | last= Marks| title=Is the diaphragm making a comeback?  | url= https://www.theguardian.com/lifeandstyle/2015/jul/10/is-the-diaphragm-making-a-comeback | newspaper= [[The Guardian]] | date= 10 July 2015}}.

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[[Category:Barrier contraception]]
[[Category:Vagina]]
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