Ovabloc

Ovabloc (in the newer version Ovalastic ) is a method of sterilizing women. In this case, both fallopian tubes are closed with a soft rubber pen so that the egg cells can no longer get into the uterus when ovulating and the woman becomes permanently sterile. The procedure is carried out without general anesthesia by means of a uterine specimen , which is why one speaks of hysteroscopic sterilization. A silicone mixture is injected into the fallopian tubes, which hardens within 5 minutes and becomes an elastic filling of the entire fallopian tube.

Advantages of the method are its good compatibility and that the silicone inserts can be easily removed again. Disadvantages are the effort and the high costs. Even if the removal of the silicone pins later is possible, this does not mean that the method is reliably reversible (reversible), as the tube cilia degenerate during the time of application and may later no longer be able to transfer the egg cell into the Transport uterus. Therefore, like other sterilization methods, the method must be viewed as a definitive procedure. The theoretical Pearl Index of the method is given with values between 0.13 and 0.4–2.6.

history

Since 1967 the mode of action of Ovabloc has been investigated in preclinical and clinical studies. In 1988 Ovabloc appeared on the Dutch market as a sterilization method. By 2015, the method was estimated to have been used in 2,000 procedures in the Netherlands. After the introduction of Essure and Adiana (also methods of hysteroscopic sterilization), the use of Ovabloc decreased significantly. Around 2015, a successor method to Ovabloc was developed with the name Ovalastic, in which the same concept was to be retained and improved.

Studies

In a 1994 study of 29 sterilizations with Ovabloc, 25 interventions (86.2%) went without complications, 3 (10.3%) failed due to technical difficulties and in one case (3.5%) the uterine wall was injured. After three months, the 25 successfully operated women underwent a follow-up examination using X-rays. In 24 women, the fallopian tubes were still blocked, and in one case it had loosened.

Six studies with Ovabloc found a 78 to 84 percent chance that the placement of the pins in both fallopian tubes would be successful on the first attempt.

Individual evidence

↑ ^a ^b Prevention - but “naturally”. April 21, 2016, accessed June 7, 2020 .
^ R. Kreienberg, H. Ludwig: 125 years of the German Society for Gynecology and Obstetrics: Values, Knowledge, Change . Springer, Berlin / Heidelberg 2011, p. 575 .
^ Sterilization in men and women. Retrieved June 7, 2020 .
↑ ^a ^b ^c I. Huvar, D. Tinga, L. Pilka: Hysteroscopic sterilization using Ovabloc . In: Ceska Gynekologie . tape 59 , no. 4 , August 1, 1994, pp. 193-195 .
↑ Urogyn, Nijmegen: Ovalastic. Urogyn bv, accessed June 7, 2020 (English).
↑ RJCM Beerthuizen: Anticonceptie op maat. Van puberty dead overgang. Bohn Stafleu van Loghum, Houten 2009, ISBN 978-90-313-7461-8 , p. 32 .
↑ ^a ^b Andrew L. Thurkow: hysteroscopic sterilization . In: Olav Istre (Ed.): Minimally Invasive Gynecological Surgery . Springer, Berlin / Heidelberg 2015, ISBN 978-3-662-44058-2 , pp. 51-53 .

[:0-1] Prevention - but “naturally”. April 21, 2016, accessed June 7, 2020 .

[2] R. Kreienberg, H. Ludwig: 125 years of the German Society for Gynecology and Obstetrics: Values, Knowledge, Change . Springer, Berlin / Heidelberg 2011, p. 575 .

[3] Sterilization in men and women. Retrieved June 7, 2020 .

[:1-4] I. Huvar, D. Tinga, L. Pilka: Hysteroscopic sterilization using Ovabloc . In: Ceska Gynekologie . tape 59 , no. 4 , August 1, 1994, pp. 193-195 .

[5] Urogyn, Nijmegen: Ovalastic. Urogyn bv, accessed June 7, 2020 (English).

[6] RJCM Beerthuizen: Anticonceptie op maat. Van puberty dead overgang. Bohn Stafleu van Loghum, Houten 2009, ISBN 978-90-313-7461-8 , p. 32 .

[:2-7] Andrew L. Thurkow: hysteroscopic sterilization . In: Olav Istre (Ed.): Minimally Invasive Gynecological Surgery . Springer, Berlin / Heidelberg 2015, ISBN 978-3-662-44058-2 , pp. 51-53 .