Polyurethane contraceptive vaginal sponge: product modifications resulting from user experience

Area of Science:

• Reproductive Health
• Contraception Development
• Spermicide Research

Background:

• A novel contraceptive vaginal sponge incorporating nonoxynol-9 (N-9) was developed.
• Preliminary studies were conducted to assess user acceptability and identify necessary product modifications.

Purpose of the Study:

• To evaluate the acceptability of a new contraceptive vaginal sponge containing nonoxynol-9 (N-9).
• To gather user feedback for product and packaging modifications.
• To inform the optimization of spermicide concentration within the sponge.

Main Methods:

• A preliminary study involving sexually active volunteers in Mexico City.
• Iterative product and packaging modifications based on user experience and physician/bioengineer feedback.
• Observation of pregnancy incidence to guide spermicide concentration adjustments.

Main Results:

• Significant product and packaging modifications were implemented based on user feedback.
• High pregnancy rates indicated the necessity of increasing nonoxynol-9 (N-9) concentration.
• Spermicide level was increased from 10% to 30% of dry sponge weight (approximately 1.0 gram per sponge).

Conclusions:

• The contraceptive sponge underwent substantial modifications to enhance user acceptability.
• The crucial role of spermicide in the contraceptive sponge system was confirmed.
• Further multicentered clinical trials are underway to determine use-effectiveness and acceptability across diverse cultures.