An intrauterine contraceptive device made from plastic and having a perimetral ring with or without a central membrane and including short inwardly directed spurs located on each of the side portions of the perimetral ring. In addition to the inner spurs, other spurs may be located on the outer side of the perimetral ring. The outer spurs preferably have a retrograde inclination and are of decreasing length from a nose portion of the perimetral ring toward the tail portion, the nose portion being slightly wider than the tail portion providing the IUD with an inverted pear shaped outline when viewed in plan. A marker and extraction string or line is preferably secured at the nose portion but can be secured to the tail portion. Between adjacent inner spurs and between adjacent outer spurs, thin webs may be utilized to provide increased IUD surface area. The webs may or may not be secured to the spurs and may terminate between or beyond the spurs. Internal of the perimetral ring is preferably a membrane joining portions of the ring. Preferably, the membrane should provide openings at least adjacent the nose and the tail to enable use of certain types of inserters. The membrane may be secured at both sides or both ends or it may be secured by a plurality of intermediate narrow membrane portions spaced around the interior of the perimetral portion.
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