Safety and Effectiveness Study of the AO-1000 Device to Treat Contained Herniated Discs
To evaluate the safety and effectiveness of the AO-1000 device to treat and relieve the pain of symptomatic subjects with contained herniated discs. This single-arm pilot study will be used as a go vs. no-go decision on performing a randomized-controlled trial.
The study's primary effectiveness objective is to demonstrate that the patient's functionality (based on Oswestry Disability Index scores) has improved from baseline at one month. The study's primary safety objective is to demonstrate that serious device/procedure related adverse events and subsequent surgical interventions are no greater than those in a literature control of other percutaneous disc decompression procedures at discharge, 1 month, 6 months, and 12 months post-treatment.
Secondary objectives are to demonstrate procedural success and improvement in the pain and function of the subjects at 1, 6, and 12 months using the VAS and ODI scales as well as tracking analgesic medication use. Pain and function scores for each follow-up time will be compared to the baseline scores.
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||A Pilot Study to Evaluate the Safety and Effectiveness of Ozone Generated and Injected by the AO-1000 Device in the Treatment of Contained Herniated Discs|
- Primary Effectiveness Endpoint: Change from Baseline ODI Score at 1 Month [ Time Frame: 1 month post-treatment ]Mean change from baseline ODI score, analyzed at 1 month. The endpoint will be deemed successful if the mean improvement is statistically shown (p<0.05) to be at least 15 points (the minimum detectable change of the ODI).
- Primary Safety Endpoint: Frequency of Serious Adverse Events Compared to Literature Control [ Time Frame: 12 months post-treatment ]The endpoint will be deemed successful if the number of serious device/procedure related adverse events are statistically shown (p<0.05) to be no greater than those in a literature control of other percutaneous disc decompression procedures.
- Functional improvement [ Time Frame: 6 and 12 months post-treatment ]Mean change from baseline ODI score, analyzed at 6 and 12 months. Each endpoint will be deemed successful if the mean improvement is statistically shown (p<0.05) to be at least 15 points (the minimum detectable change of the ODI).
- Leg and Back Pain Improvement [ Time Frame: 1, 6, and 12 months post-treatment ]Mean change from separate leg and back pain baseline Visual Analog Scale (VAS) scores, analyzed at 1, 6, and 12 months. Each endpoint (leg VAS and back VAS at each follow-up time) will be deemed successful if the mean improvement is statistically shown (p<0.05) to be at least 20 mm (the minimum clinically important difference of the VAS).
- Procedural Success [ Time Frame: Time of Treatment ]Technical success, as assessed by successful injection of oxygen-ozone mixture confirmed via CT scan performed immediately following the treatment. A treatment will be considered a success if the CT scan shows gas within the target disc.
- Analgesic Medication Use [ Time Frame: 1, 6, and 12 months post-treatment ]Change in prescription and over-the-counter (OTC) analgesic medication use, including non-steroidal anti-inflammatory drugs (NSAIDs) from baseline, analyzed at 1, 6, and 12 months. Endpoint will be deemed successful if the number of patients using analgesic medication decreases from baseline.
|Study Start Date:||August 2011|
|Study Completion Date:||April 2016|
|Primary Completion Date:||April 2016 (Final data collection date for primary outcome measure)|
Experimental: AO-1000 Treatment
Oxygen-ozone treatment with the AO-1000 device
Mixture of 2 weight% ozone in 98 weight% oxygen injected into the nucleus pulposus of a contained herniated disc.
The AO-1000 device provides an oxygen-ozone treatment for contained herniated discs. An oxygen-ozone treatment is a minimally invasive injection for treating disc herniations that is widely practiced in Europe and Asia. This treatment involves the injection of an oxygen-ozone mixture into the herniated disc and/or the paravertebral muscle surrounding the disc. However, there are no medical ozone generators for this procedure that are currently cleared by the FDA for use in the US. Many studies using a wide range of inclusion/exclusion criteria, ozone concentrations, and procedures have been performed to determine the effectiveness of oxygen-ozone treatment.
A meta-analysis of nearly 8,000 patients from published studies shows a mean improvement of 39 mm for VAS and 25.7 for ODI. The likelihood of complications was 0.064%. Furthermore, no cases of discitis were reported after oxygen-ozone therapy, which is unlike all the other methods of disc volume reduction. This is most likely due to the fact that ozone is a strong oxidizer and an excellent disinfecting agent. The complications shown in the meta-analysis were minor and transient, and easily avoidable by utilizing a device such as the AO-1000 that is designed to eliminate these types of complications (ozone leakage into the treatment room and high ozone concentrations) during this procedure. The estimated complication rate from the meta-analysis is consistent with the Italian Oxygen-Ozone Therapy Federation (FIO) results (no procedure-related adverse events in treatments on 15,000 patients).
The safety of the direct injection of oxygen-ozone gas mixture into the nucleus pulposus was well established in these studies. Therefore, the intent of this study is to obtain data to confirm that a 2 weight percent (wt%) oxygen-ozone mixture delivered from the AO-1000 device is safe and effective for the intended use. This clinical study is designed to bridge the AO-1000 to the extensive prior oxygen-ozone treatment safety and effectiveness data between studies such as those found in the Meta-analysis that did not use the AO-1000 as the delivery system.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01339377
|Canada, British Columbia|
|Vancouver General Hospital|
|Vancouver, British Columbia, Canada, V5Z 1M9|
|University of Western Ontario - London Health Sciences Centre|
|London, Ontario, Canada, N6H 5A5|
|Toronto Western Hospital|
|Toronto, Ontario, Canada, M5T 2S8|