Multicenter Trial of Magnetic Mini-Mover for Pectus Excavatum (3MP)
|ClinicalTrials.gov Identifier: NCT01327274|
Recruitment Status : Active, not recruiting
First Posted : April 1, 2011
Results First Posted : May 17, 2018
Last Update Posted : May 17, 2018
|Condition or disease||Intervention/treatment||Phase|
|Pectus Excavatum||Device: Magnetic Mini-Mover Procedure (Magnimplant)||Not Applicable|
Pectus excavatum is the most common congenital chest wall abnormality in children. The investigators have developed a novel method of achieving gradual deformation/reformation of chest wall cartilage. A magnetic force field is used to apply controlled, sustained force to promote biologic reformation of structural cartilage. A magnet is implanted on the sternum and secured through a 2-inch subxiphoid incision as a one-hour outpatient procedure. The magnet (and sternum) is pulled outward by another magnet suspended in a novel, low-profile, lightweight device previously molded to the patient's anterior chest wall. The low-profile, non-obtrusive anterior chest wall prosthesis is held in place by the force field between the two magnets.
In the single-center, FDA-funded trial (IDE G050196), the investigators tested proof of concept, safety and probable benefit of this procedure in 10. In this Phase III multicenter trial, the investigators will further test the safety and efficacy of the procedure in 15 otherwise healthy patients with moderate-to-severe PE, ages 8 to 14. The investigators will be using the next generation Magnetic Mini-Mover Magnimplant device (IDE G090006), a design the investigators believe is much improved in terms of safety and ease of implantation/explantation. Implantation of the Magnimplant will be accomplished in an outpatient procedure. The investigators will document the rate of correction by comparing chest X-ray measurement of the Pectus Severity Index prior to implantation, to that measured after the magnet is removed. Treatment will last 18-24 months, depending on correction and when the patient has completed his or her pubertal growth spurt, as documented by hand x-ray. Explant of the device will be accomplished in an outpatient procedure. The investigators will document safety with an EKG prior to implantation, one month post-implantation, and finally after the magnet is removed. The investigators will document efficacy by comparing pre- and post-treatment PSI, as well as by evaluating patient satisfaction with a post-procedure Quality of Life-type survey. Long-term follow-up will occur at 6, 12, 18, and 24 months after explantation.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||15 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||Phase 3 Multicenter Study of Magnetic Mini-Mover for Pectus Excavatum|
|Study Start Date :||December 2011|
|Actual Primary Completion Date :||November 2016|
|Estimated Study Completion Date :||May 2018|
Experimental: Treatment Arm
This is a non-randomized study in which otherwise healthy patients, ages 8-14, with severe pectus excavatum (PSI > 3.5) will undergo the interventional treatment arm by having outpatient surgery and the Magnetic MIni-Mover Magnimplant procedure is performed during which the magnetic implant is surgically placed. After 2 years of treatment with the implanted magnet and brace treatment, the Magnetic Mini-Mover Magnimplant will be explanted. After surgery and recovery, all subjects will be fitted for an orthotic brace, which houses the external magnet and records brace-wear compliance. They will undergo 3MP treatment for 18-24 months, enough to attempt to improve their PSI (< 3.25).
Device: Magnetic Mini-Mover Procedure (Magnimplant)
This is a non-randomized study in which otherwise healthy patients, ages 8-14, with severe pectus excavatum (PSI > 3.5) will undergo the Magnetic Mini-Mover procedure outpatient surgery. The Magnimplant or Magnetic Mini-Mover device implant will surgically implanted on the sternum. Patients will be required to wear a custom-fitted orthotic brace, which houses the external magnet and records brace-wear compliance. They will undergo brace treatment for 18-24 months, enough to attempt to improve their PSI (< 3.25). Patients will be seen in clinic at least monthly until treatment is complete and the magnimplant device will be explanted from their sternum.
Other Name: IDE G090006
- Number of Participants With Adverse Reactions [ Time Frame: During treatment, 24 months ]All adverse reactions were recorded and reported, including complications from implantation of the device, complications from application of the external device over time (e.g., changes in skin; infection; changes in cardiac electrical function).
- Comfort and Brace Wear During Treatment [ Time Frame: During treatment, 24 months ]Comfort of the external brace directly affects compliance (i.e., bracewear) and compliance were be measured throughout treatment. In addition, the satisfaction of the patient and family will be measured using a standard Quality of Life (QOL) questionnaire administered 1 month after implanting the device and 1 month after removing the device.
- Chest Wall Correction, by Pectus Severity Index [ Time Frame: 24 months ]Though not powered to determine efficacy, preliminary efficacy data, as measured by pre and post treatment Pectus Severity Index (Haller Index), was also collected. Pre-treatment Haller Index was assessed based on computed tomography (CT) of the chest. One month after implant removal, patients underwent repeat chest CT to evaluate chest wall correction.
- Patient Satisfaction During the Treatment [ Time Frame: One month and one year after explant. ]. Patients were asked to fill out questionnaire at 2 intervals: 1 month after explant and 1 year after explant
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01327274
|United States, California|
|Shriners Hospitals for Children|
|Sacramento, California, United States, 95817|
|UCSF-Benioff Children's Hospital|
|San Francisco, California, United States, 94158|
|United States, Missouri|
|Children's Mercy Hospitals|
|Kansas City, Missouri, United States, 64108|
|Study Director:||Michael R Harrison, MD||University of California, San Francisco|
|Principal Investigator:||Benjamin Padilla, MD||University of California, San Francisco|
|Principal Investigator:||Lan Vu, MD||University of California, San Francisco|