Ultrasound-guided female sterilization
Ultrasound can be used to guide an injection into the uterus, uterine horns, fallopian tubes, or ovaries of female mammals, including dogs and humans. We have discovered that it is quite hard to inject into the ovaries due to the difficulty of puncturing the hard outer capsule. Ultrasound can be used to aid in visualizing the ovary, but injection is still a challenging task. Ultrasound-guided intrauterine injectable sterilization or contraception could be performed with a number of substances, including calcium chloride solution, alcohol, or a polymer contraceptive such as Vasalgel, RISUG or FerroCept. We found that injecting into the uterine horns in dogs was relatively simpler than injecting into the ovary. However, sclerosants injected into the uterine horns did not appear to sterilize a female dog. We are no longer working on intrauterine injections, but have provided information on our research in this area as background and guidance to others interested in these approaches, so that someday female animals (and women) could get sterilization without surgery. (Women have some alternate approaches for this called Essure and Adiana, but there’s nothing currently for dogs and cats.)
Details of the ultrasound guided female sterilization studies are available.
This information was added to the prior art database on December 21, 2010 (available here) so that it is in the public domain. Researchers may study this approach without barriers now, as it is no longer patentable. Permission from Parsemus Foundation is not required.
For info on current approaches to nonsurgical dog and cat sterilization, see the Alliance for Contraception in Cats & Dogs and the Found Animals Foundation Michelson Prize and Grants.