RecruitingNot ApplicableNCT07556601

Ultra-rapid Blastocyst Vitrification: Pilot Randomized Study

Clinical Validation of Ultra-rapid Blastocyst Vitrification: a Randomized Pilot Study in Oocyte Donation Cycles

Sponsor

Fundacion Dexeus

Enrollment

80 participants

Start Date

Jun 1, 2026

Study Type

INTERVENTIONAL

Conditions

Infertility

Summary

Blastocyst vitrification is standard in assisted reproduction, but clinical data on ultra-rapid vitrification are limited. This pilot study evaluates the safety, feasibility, and preliminary clinical performance of an ultra-rapid blastocyst vitrification protocol compared with the standard approach.

Eligibility

Sex: FEMALEMin Age: 18 YearsMax Age: 50 Years

Plain Language Summary

Simplified for easier understanding

This clinical trial is studying Standard Vitrification and Ultra-Rapid Vitrification for people with infertility. The study is currently recruiting participants at 2 locations. People eligible for this study include women aged 18 Years to 50 Years.

This summary was AI-generated to explain the trial in plain language. It is not medical advice. Always discuss eligibility with your doctor before enrolling in a clinical trial.

Interested in this trial?

Get notified about updates and connect with the research team.

Interventions

OTHERStandard Vitrification

1. Equilibration step: Blastocysts are equilibrated in Equilibration Solution (ES) for 10-12 minutes at room temperature. 2. Vitrification solution exposure: Blastocysts are then transferred to Vitrification Solution (VS) for a maximum exposure time of 90 seconds. 3. Loading: The blastocyst is loaded onto a Cryotop device (Kitazato). 4. Vitrification: The Cryotop is plunged directly into liquid nitrogen within 1 second of loading to ensure ultra-rapid cooling. 5. Capping: The Cryotop is immediately capped under liquid nitrogen conditions.

OTHERUltra-Rapid Vitrification

The ultra-rapid vitrification protocol is identical to the standard protocol in terms of media, devices, and laboratory conditions, with the following modifications: Preparation step - Blastocyst shrinkage: Prior to equilibration, artificial collapse of the blastocyst is performed using a single laser pulse to induce blastocoel shrinkage. The subsequent steps are: 1. Equilibration step: Blastocysts are equilibrated in Equilibration Solution (ES) for 2-4 minutes. 2. Vitrification solution exposure: Transfer to Vitrification Solution (VS) for a maximum of 90 seconds. 3. Loading: Loading of the blastocyst onto a Cryotop device. 4. Vitrification: Immediate plunging of the Cryotop into liquid nitrogen within 1 second. 5. Capping: Immediate capping under liquid nitrogen.