Non-Invasive System to Deliver Therapeutic Hypothermia for Protection Against Noise-Induced Hearing Loss

NCT ID: NCT06729632

Last Updated: 2025-04-02

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 116 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-12-19
• Study Completion Date: 2026-12-31

Brief Summary

The goal of this interventional clinical study is to investigate the use of mild therapeutic hypothermia devices for preservation of sensory structures in the cochlea after noise exposure. The main aims of the study are:

1. To test the safety and best duration for use for a new hypothermia device.

2. To determine if the hypothermia device helps decrease noise-induced hearing loss in a group of firefighters.

Participants will wear the mild therapeutic hypothermia therapy devices immediately after a fire service shift serially over a year. Researchers will compare results from those receiving the therapy to those from a control group (individuals receiving no therapy and a sham therapy).

Detailed Description

Noise-induced hearing loss (NIHL) is highly prevalent among occupationally at-risk service groups like the military and firefighters, with disabilities that result in significant healthcare burden, negatively impacting performance on duty and quality of life. Exposure to noise can cause permanent threshold shifts (PTS) with accompanying hair cell loss, or temporary threshold shifts (TTS), with no evident hair cell loss. Noise exposure can also result in rapid and permanent loss of synaptic elements and cochlear nerve terminals with irreversible hearing impairment and long-term degeneration of spiral ganglion (SG) cell bodies.

Currently no FDA-approved treatments are available to prevent or treat NIHL. Delivering pharmaceutical compounds over time, identification of safe dosages, and a critical timeframe relative to noise-exposure remain clinically challenging. RestorEar Devices LLC has developed a non-pharmaceutical application of mild therapeutic hypothermia (MTH) to protect residual sensory structures and function of the cochlea. MTH is a proven and well-established therapy for neuroprotection. This approach for MTH application is based on significant prior and on-going research that highlights its utility for residual hearing preservation against cochlear implant surgical trauma, ototoxicity, and noise exposure. With SBIR Phase I support, the investigators have successfully demonstrated that effective non-invasive, non-pharmaceutical therapeutic hypothermia can be delivered to the inner ear sensory structures. The investigators have built, calibrated, and tested ReBoundTM, a headband with cooling gel packs placed in contact with the surface of the mastoid. ReBoundTM delivers MTH safely and repeatedly for up to 30 minutes. In this study, the investigators aim to extend this application to human subjects and test safety and efficacy against NIHL in noise-exposed firefighters and matched controls with the collaboration of researchers at the University of Miami.

Aim 1: Evaluate safety of MTH with ReBoundTM devices. With the first in-human studies, the investigators aim to show that MTH can be safely delivered to the inner ear using ReBound. In a randomized study, non-firefighter control subjects will receive MTH-treatment and normothermia-sham (non-cooled gel pack) through the device alternated over 8 sessions. Subjective assessments and audiologic testing (pure tone audiometry, auditory brainstem responses, distortion product otoacoustic emissions and electrocochleography) pre- and post-treatments will be compared between MTH-treatment and sham in each subject. Results of Aim 1 will support the hypothesis that this approach will deliver therapeutic hypothermia to the cochleae and that repeated application will not negatively affect hearing function in healthy subjects.

Aim 2: Validate efficacy of the ReBoundTM MTH devices for mitigating NIHL in an occupationally at-risk group. Based on strong preliminary results, the investigators hypothesize that acute application of MTH in noise-exposed firefighters will reduce temporary changes in auditory function. Firefighters will be divided equally into two treatment groups, MTH-treatment and normothermia-sham. These treatments will be delivered with ReBound, with and without cooled gel packs, applied post-duty. MTH-treatment will also be applied in an age- and sex-matched control group over the same duration. Baseline hearing function will be measured prior to initiation of the treatment. Treatments and the functional assessments will be repeated quarterly over one year. Temporary and permanent threshold changes in this chronically the noise exposed group of firefighters receiving MTH-treatment will be compared with firefighters receiving sham-treatment and with controls receiving MTH-treatment. MTH-groups will also be sent home with a ReBound band and instructed to use it after noise exposure. Subjective assessments will be sent weekly to these groups to evaluate the use pattern of the device. Results of these studies will firmly establish MTH for mitigating NIHL.

This research will be highly impactful given the significant adverse effects of NIHL, an unmet clinical need, and the high translational potential of MTH for mitigating NIHL.

Conditions

Noise Exposure; Noise-induced Hearing Loss; Noise; Adverse Effect; Mild Therapeutic Hypothermia; Cooling; Occupational Exposure; Occupational Health; Hidden Hearing Loss

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: PREVENTION
• Blinding Strategy: DOUBLE

Study Groups

Safety Arm

Non-firefighter control subjects will receive MTH-treatment and normothermia-sham through the device alternated over 8 sessions. Subjective assessments and audiologic testing pre- and post-treatments will be compared between MTH-treatment and sham in each subject. n=24.

Group Type: EXPERIMENTAL

Cold pack-delivered mild therapeutic hypothermia

Intervention Type: DEVICE

Mild therapeutic hypothermia (cooling), delivered non-invasively to the structures of the inner ear (cochlea) for 30 minutes, using headband-style proprietary device, ReBoundRx.

Efficacy Arm 1 - Treatment

Firefighters will receive hypothermia treatment delivered with ReBound devices, applied post-work shift. Baseline hearing function will be measured prior to initiation of the treatment. Treatments and functional assessments will be repeated quarterly over one year. Temporary and permanent threshold changes in this chronically noise exposed group of firefighters receiving MTH-treatment will be compared with firefighters receiving sham-treatment and with controls receiving MTH-treatment. Subjects in this group will also be sent home with a device to use after noise exposure during the study period. They will complete weekly, remote surveys collecting data on their noise exposure and device use. n=24.

Group Type: EXPERIMENTAL

Cold pack-delivered mild therapeutic hypothermia

Intervention Type: DEVICE

Mild therapeutic hypothermia (cooling), delivered non-invasively to the structures of the inner ear (cochlea) for 30 minutes, using headband-style proprietary device, ReBoundRx.

Efficacy Arm 2 - Non-Therapeutic

Firefighters will receive non-therapeutic "treatment" delivered with normothermic ReBound devices, applied post-work shift. Baseline hearing function will be measured prior to initiation of the treatment. Treatments and functional assessments will be repeated quarterly over one year. n=24.

Group Type: NO_INTERVENTION

No interventions assigned to this group

Efficacy Arm 3 - Control

Age- and sex-matched non-firefighter control group will receive MTH-treatment quarterly over the same duration. Baseline hearing function will be measured prior to initiation of the treatment. Treatments and functional assessments will be repeated quarterly over one year. Subjects in this group will also be sent home with a device to use after noise exposure during the study period. They will complete weekly, remote surveys collecting data on their noise exposure and device use. n=24.

Group Type: ACTIVE_COMPARATOR

Cold pack-delivered mild therapeutic hypothermia

Intervention Type: DEVICE

Mild therapeutic hypothermia (cooling), delivered non-invasively to the structures of the inner ear (cochlea) for 30 minutes, using headband-style proprietary device, ReBoundRx.

Interventions

Cold pack-delivered mild therapeutic hypothermia

Mild therapeutic hypothermia (cooling), delivered non-invasively to the structures of the inner ear (cochlea) for 30 minutes, using headband-style proprietary device, ReBoundRx.

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

• Adults aged 18-55 years old at the time of signing the consent form
• Fluency in English

Exclusion Criteria

• Abnormal tympanometric findings
• Abnormal pure tone audiometry from 500-8,000 Hz (Non-firefighters only)
• Significant history of noise exposure (Non-firefighters only)
• Temporomandibular joint disorder
• Otologic pathologies (including, but not limited to): acoustic neuroma/vestibular schwannoma, chronic ear disease, Meniere's disease, documented fluctuating hearing loss, or ototoxicity
• Current recipients of medical, pharmacologic, or therapeutic intervention for tinnitus or other otologic conditions
• Active hearing aid users
• Adults unable to consent

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 55 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of Miami

OTHER

Sponsor Role: collaborator

National Institute on Deafness and Other Communication Disorders (NIDCD)

NIH

Sponsor Role: collaborator

Restorear Devices LLC

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Suhrud M Rajguru, PhD

Role: PRINCIPAL_INVESTIGATOR

RestorEar Devices

Locations

University of Miami

Miami, Florida, United States

Site Status: RECRUITING

Countries

United States

Central Contacts

Suhrud M Rajguru, PhD

Role: CONTACT

srajguru@restorear.com

801-641-8180

Curtis S King

Role: CONTACT

cking@restorear.com

406-414-6278

Facility Contacts

Suhrud M Rajguru, PhD

Role: primary

srajguru@restorear.com

801-641-8180

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2R44DC018760-02A1

Identifier Type: NIH

Identifier Source: secondary_id

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DC018760

Identifier Type: -

Identifier Source: org_study_id