Librata Endometrial Ablation Device Treatment to Reduce Menstrual Blood Loss in Sites Across the United Kingdom

Inclusion Criteria: 1. Refractory heavy menstrual bleeding with no definable organic cause 2. Female subject from (and including) age 25 to 50 years 3. Uterine sound measurement between 6.0 to 10.0cm (external os to fundus). 4. A minimum menstrual blood loss of * Menstrual Pictogram (MP) score of ≥150 for 3 consecutive months prior to study enrollment; OR, * MP score ≥150 for one month for women who either had: * at least 3 prior months documented failed medical therapy; or * a contraindication to medical therapy; or * refused medical therapy 5. Premenopausal at enrollment as determined by FSH measurement ≤ 40 IU/L 6. Not pregnant and no desire to conceive at any time 7. Subject agrees to use a reliable form of contraception. If a hormonal birth control method is used, the subject must have been on said method for ≥ 3 months prior to enrollment and agrees to remain on the same hormonal regimen through their study participation. 8. Able to provide written informed consent using a form that has been approved by the reviewing IRB/EC 9. Subject agrees to follow-up schedule and data collection requirements 10. Subject is literate or demonstrates an understanding on how to collect menstrual blood loss products, and use of the Menstrual Pictogram (MP) diary Exclusion Criteria: Participants who have or meet any of the following exclusion criteria will not be enrolled in the Study: 1. Pregnancy or subject with a desire to become pregnant 2. Endometrial hyperplasia as confirmed by histology 3. Presence of active endometritis 4. Active pelvic inflammatory disease 5. Active sexually transmitted disease (STD), at the time of ablation. * Note: Treatment of STD documented in the chart serves as sufficient evidence of infection resolution. Subject may be considered for study enrollment. 6. Presence of bacteraemia, sepsis, or other active systemic infection 7. Active infection of the genitals, vagina, cervix, uterus or urinary tract at the time of the procedure 8. Known/suspected gynecological malignancy within the past 5 years 9. Known clotting defects or bleeding disorders 10. Untreated/unevaluated cervical dyskaryosis (except CIN I) 11. Known or suspected abdominal/pelvic cancer 12. Prior uterine surgery (except lower segment caesarean section) that interrupts the integrity of the uterine wall (e.g., myomectomy or classical cesarean section) 13. Previous endometrial ablation procedure 14. Currently on medications that could thin the myometrial muscle, such as long-term steroid use (except inhaler or nasal therapy for asthma) 15. Currently on anticoagulants 16. Abnormal shaped uterine cavity as confirmed by transvaginal ultrasound scan +/- hysteroscopy - specifically: * Septate or bicornuate uterus or other congenital malformation of the uterine cavity * Submucosal fibroids (grade 0-2) which protrude \>1cm into the uterine cavity * Polyps \> 2cm in maximum diameter * Intramural or subserosal fibroid greater than 3 cm 17. Presence of an intrauterine device (IUD) which the subject unwilling to have removed at the time of the operative visit 18. Presence of an implantable contraceptive device (e.g. Essure or Adiana). 19. Subject not currently on hormonal birth control therapy and unwilling to use a non-hormonal birth control post-ablation. 20. Subject wanting concomitant hysteroscopic sterilization. 21. Subject who is within 6-weeks post-partum. 22. Any general health condition which, in the opinion of the Investigator, could represent an increased risk for the subject 23. Any subject who is currently participating or considers future participation in any other