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Updated: Jun 26, 2026

Utero-tubal Embryo Transfer and Vasectomy in the Mouse Model
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Mock embryo transfer does not affect uterine contractility.

Antoine Torre1, Juliano Brum Scheffer, Luca Maria Schönauer

  • 1Assistance Publique-Hôpitaux de Paris, Department of Obstetrics and Gynecology and Reproductive Medicine, Hôpital Antoine Béclère, Paris, France.

Fertility and Sterility
|January 10, 2009
PubMed
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Mock embryo transfer (ET) catheter insertion does not significantly alter uterine contraction frequency. Catheter stiffness also had no impact on uterine stimulation during this common fertility procedure.

Area of Science:

  • Reproductive Medicine
  • Gynecology
  • Medical Device Evaluation

Background:

  • Mock embryo transfer (ET) is a standard procedure in fertility treatments.
  • Uterine contractions (UC) can potentially affect embryo implantation.
  • The impact of mock ET catheterization on UC frequency is not well-established.

Purpose of the Study:

  • To evaluate the effect of transcervical catheter introduction, simulating mock ET, on uterine contraction frequency.
  • To determine if catheter stiffness influences uterine stimulation.

Main Methods:

  • Prospective study involving 80 women undergoing mild ovarian stimulation and intrauterine insemination (IUI).
  • Uterine contraction frequency was measured using ultrasound before and after catheter insertion.

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  • Catheters of varying stiffness (low, medium, high) were tested.

    • Main Results:

    • No significant difference was observed in UC frequency before and after catheter insertion.
    • Catheter stiffness did not influence the change in UC frequency.
    • Median percentage change in UC frequency was 0 across all stiffness groups.

    Conclusions:

    • Transcervical catheter insertion to the inner cervical os, as performed in mock ET, does not stimulate uterine contraction frequency.
    • Catheter stiffness is not a factor in UC stimulation during mock ET procedures.