Sterilization of women by surgical occlusion of the fallopian tubes remains the most popular of modern contraceptive methods; Current estimates suggest that more than 140 million eligible couples rely on female sterilization to avoid further pregnancies (WHO 1995). Up to the present the most commonly used surgical procedure is a transabdominal minilaparotomy. Major drawbacks of this technique are the costly instruments required for laparoscopy, the need for adequate anesthesia as well as post-operative pain relief, and the training needed for delivery of services; The need for non-invasive reversible sterilization techniques to reduce the risk, cost, patient discomfort and morbidity associated with surgical sterilization is widely recognised. The objective of this project is to develop a sterilization technique that will reduce the risks and costs of surgical sterilization procedures and provide women with the option of an efficient and potentially reversible form of birth control. In the project we will develop and evaluate a transcervical intratubal contraceptive device which can be placed without anesthesia under plain ultrasound guidance or by tactile impression. We will incorporate recent developments in the field of ultrasound and tactile guided tubal cannulation in the delivery system, resulting in a design that will allow atraumatic insertion and will be as independant of skill as possible and practicable for service delivery in an office setting.