The Device

A CE-Marked Silicone Ring with a New Research Purpose

The Circunaro ring was originally developed and CE-marked as a reversible simulated mechanical circumcision device for the treatment of premature ejaculation due to genital hypersensitivity. We are now investigating its potential to modulate the penile microbiome and reduce partner transmission of BV-associated bacteria.

The Circunaro ring — a translucent medical-grade silicone device
What It Is

Medical-Grade Silicone, Non-Invasive Design

Material
Medical-grade silicone — biocompatible, hypoallergenic, and durable
Mechanism
Maintains foreskin in retracted position, exposing glans to atmospheric oxygen
Use
User-controlled, reversible, removed for sexual activity and daily hygiene
Safety
Zero adverse events reported across thousands of units sold over six years of commercial use.
History & Development

From Medical Device to Research Tool

The Circunaro ring was CE-marked as a Class I medical device indicated for simulated mechanical circumcision for the treatment of premature ejaculation caused by genital hypersensitivity. Manufactured in medical-grade silicone and commercially available for six years, the device's pivot to a research focus came from recognizing its potential relevance to a growing body of literature on the male genital microbiome and maternal health.

  1. Jan 2019 CE marking achieved. Class I, non-sterile device under Medical Device Directive 93/42/EEC (as amended by 2007/47/EC).
  2. 2019–2025 Commercial availability. Thousands of units sold across multiple markets. Zero adverse events reported.
  3. Dec 2025 Strategic research pivot. New collaborations initiated to investigate the device's potential impact on reproductive health.
  4. 2026 First research collaboration established. Pilot study participants being recruited in East Africa to evaluate device efficacy, safety, and adherence in the context of genital hygiene and reproductive tract infections.
Circunaro retail packaging — professional teal and white box showing this is a manufactured, CE-marked product

The Circunaro ring was commercially manufactured and CE-marked as a Class I medical device.

Safety Profile

Established Safety Basis

Regulatory status
CE-marked under the Medical Device Directive as a Class I device. Medical-grade silicone meets biocompatibility standards.
Adverse events
Zero adverse events reported across thousands of units sold over six years of commercial availability (January 2019 – May 2025).
Customisable, safety‑led design
The ring was designed with safety as the primary constraint, allowing comfortable long‑term wear without constriction. Users can trim the male end to achieve a personalised fit that matches individual anatomy. The interlocking design permits easy detachment.
User control
The ring is fully flexible and can be removed by the user at any time, distinguishing it from rigid constriction devices associated with known risks.
For Research Teams

Available to Qualified Investigators

The Circunaro device design is openly available. We are open to licensing, technology sharing, and providing devices at cost across the global health ecosystem. We actively seek collaborators who want to explore this intervention — our goal is maximum impact, not exclusivity. We place no restrictions on the publication of research results.

  • Device supply at cost (materials + shipping only)
  • CE marking documentation and safety history
  • Scientific rationale and literature review support
  • Willingness to co-develop study protocols
  • No restrictions on publication of results
  • Open to co-authorship arrangements
Enquire about collaboration