Inclusion Criteria:
* 1.Age ≥ 18 at the time of enrollment
* 2.Patient with a vagina or vaginal canal who have completed radiation therapy (either external beam or brachytherapy, or a combination of both) for endometrial cancer, cervical cancer, anal cancer, or rectal cancer, without concomitant chemotherapy
* 3.Generally in good health (other than due to cancer), at the discretion of the investigator(s)
* 4.Eastern Cooperative Oncology Group (ECOG) score or 0 to 2
* 5.Participants must be post-menopausal (natural or surgically) for at least 1 year prior to screening or be surgically sterile (absence of ovaries and/or uterus); or, a participant of child-bearing potential must agree to use a medically approved method of birth control for the duration of the study. All hormonal birth control must have been in use for a minimum of three months.
* 6.Agree not to use other dilators for the 12-week intervention period
* 7.Must have the ability to charge the investigational device
* 8.Must be willing and able to insert intravaginal device
* 9.Able to understand, comply and consent to protocol requirements and instructions
* 10.Able to attend scheduled study visits and complete required investigations
* 11.Ability to understand and willingness to sign written informed consent
Exclusion Criteria:
* 1.Participants who are pregnant or planning to become pregnant during the trial
* 2.Any major surgery in the past 3 months unless post-surgery dilator use is recommended by a physician, or anticipates having a major surgery during the study
* 3.Any other medical condition or clinical finding giving reasonable suspicion of a disease or condition that contraindicates the use of the investigational product or that may affect the interpretation of the results or leave the patient at high risk from treatment complications, at the discretion of the investigator(s)
* 4.Allergy to Hyivy device's materials
* 5.Active pelvic or gynaecological infection
* 6.Current use of antibiotics for any infection
* 7.Have open wounds, cuts, or open sores present in the vaginal or pelvic area
* 8.Severe atrophic vaginitis or very dry, itchy, or sore vagina/vaginal area, at the discretion of the investigator(s)
* 9.Hypoesthesia or loss in sensation of the pelvic floor
* 10.Total and/or partial prolapse of the uterus and/or vagina
* 11.Symptoms of severe urinary retention, severe extra-urethral incontinence, or overflow incontinence
* 12.Unable to position the device according to directions for use
* 13.Use of any medical devices that may interfere with the investigational device's function, such as pacemakers, ventilators, and ear implants
