Locating Hormone-Releasing Contraceptive Implants Using Near-Infrared Light

Area of Science:

• Medical Devices
• Contraception
• Medical Imaging

Background:

• Long-acting reversible contraceptives, such as etonogestrel implants, are highly effective for pregnancy prevention.
• Palpation failure can occur in a minority of patients, complicating implant removal and increasing risks.
• Current methods like ultrasonography require specialized expertise for locating difficult implants.

Purpose of the Study:

• To introduce and evaluate a novel, accessible method for locating nonpalpable contraceptive implants.
• To provide an alternative to ultrasonography for improving the ease and safety of etonogestrel implant removal.

Main Methods:

• Utilized near-infrared light, a technique previously employed for venipuncture and glucose sensor localization.
• Positioned the near-infrared light source perpendicularly at a distance of 33 cm from the arm.
• Observed the reflection of the etonogestrel implant on the skin upon device activation and marked the location.

Main Results:

• Successfully located nonpalpable etonogestrel implants in five women using near-infrared light.
• The method demonstrated ease of use and clear visualization of implant location.
• The procedure allowed for straightforward marking of the implant site prior to removal.

Conclusions:

• Near-infrared light is an effective tool for locating nonpalpable etonogestrel contraceptive implants.
• This novel technique serves as a practical alternative to ultrasonography.
• The method enhances the safety and accessibility of contraceptive implant removal procedures.