Safety and Effectiveness Study of the AO-1000 Device to Treat Contained Herniated Discs

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.

Inclusion criteria

• 18 to 70 years of age
• Herniated disc between L1 and S1 evident on diagnostic imaging
• Sciatica with or without lower back pain for > 3 months
• Failure to improve with non-operative care (Conservative treatment failure)
• Sciatica with or without lower back pain exacerbated by sitting and/or standing with recumbent relief
• A preoperative leg or back VAS (pain) score between 40 and 90 mm on a 100 mm scale. (moderate to severe pain)
• A preoperative ODI (function) score between 40 and 90 (moderate to severe functional disability)
• Able and willing to return for the follow-up evaluations
• The pain must be consistent with the dermatome pattern and must be clearly identifiable to the herniated disc.

Exclusion criteria

• Functional neurological deficit evident during neurological exam
• Previous spine surgery in the lumbar region or adjacent to the disc of interest
• Cord compression or cauda equine syndrome
• Structural deformities (e.g. spondylolisthesis, greater than a mild degree of non-discogenic vertebral canal stenosis, greater than a mild degree of scoliosis, spinal fracture, disc herniations > 4 mm, sequestered herniation)
• Extruded/free disc fragment
• Calcified disc fragment
• Disc height loss > 75%
• Inaccessible disc due to, for example, overlap of the iliac wings, and/or steep angulation of the L5/S1 disc space
• Coagulopathy evident on blood sample testing
• Platelet count < 50,000
• International Normalized Ratio (INR) > 1.4
• Partial Thromboplastin Time (PTT) > 1.3
• White blood cell count (WBCC) > 12,000
• Infection as evidenced by subject clinical evaluation, history, and blood test
• Any evidence of osteomyelitis/discitis at any level
• Uncontrolled/acute illness
• Women who are pregnant
• Worker's compensation, injury litigation, disability remuneration
• Participation in another clinical investigation or course of care that may confound the outcome of this study
• Smoker