Magnetic Bead Tracking System and eOPRA Implant System With Bionic Prosthesis for Transtibial Amp… (NCT06391697) | Clinical Trial Compass
Active — Not RecruitingNot Applicable
Magnetic Bead Tracking System and eOPRA Implant System With Bionic Prosthesis for Transtibial Amputees
United States7 participantsStarted 2024-05-01
Plain-language summary
The e-OPRA Implant System, is a further development of the OPRA (Osseointegrated Prostheses for the Rehabilitation of Amputees) Implant System. The e-OPRA Implant system is an implant system for direct skeletal anchorage of amputation prostheses. The added feature in the e-OPRA Implant system, is a bidirectional interface into the human body that allows permanent and reliable communication using implanted electrodes. These electrodes will provide long-term stable bioelectric signals for an improved control of the prosthetic limb. The Magnetic Bead Tracking System, which will be implanted and used in combination with the e-OPRA Implant system, is an investigational device that consists of pairs of magnetic beads, and a set of magnetic field sensors that measure and track the length of muscles and the speed at which they move in real-time. When the beads are implanted in muscle in the residual limb of an amputee, the muscle length signal is communicated to an investigational, robotic ankle-foot prosthesis. The purpose of the study is to evaluate the feasibility of a transtibial amputee with the e-OPRA Implant System and Magnetic Bead Tracking System exhibiting full neural control over a neuro-mechanical prosthetic system.
A maximum of seven subjects will be enrolled. Each subject will undergo one or more surgeries where the e-OPRA Implant System and Magnetic Bead Tracking System will be implanted. The subjects will participate in follow-up sessions the last of which occurs approximately 24 months after the surgery. This is a prospective, non-randomized, uncontrolled study.
Who can participate
Age range
22 Years – 65 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion criteria
. Male or Female age 22-65 at the time of surgery.
. The subject must already have been implanted with the e-OPRA Implant System at the transtibial level or must have an existing unilateral or bilateral transtibial amputation or a medical condition requiring performance of a unilateral or bilateral transtibial amputation with a minimum of 8 cm of residual tibia after amputation, such that the subject will be implanted with the e-OPRA Implant System. (OPTION 1)
. If the subject does not already have the e-OPRA Implant System, the subject must have undergone independent consultation with at least two lower extremity surgical specialists to ensure they have exhausted all limb salvage options prior to undergoing amputation, as well as a psychiatric evaluation to ensure appropriate capacity and volition. (OPTION 2)
. The patient must have the ability to ambulate at variable cadence (an expected lower extremity prosthesis functional level of K3 or above, as confirmed by study investigators).
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
number of participants out of total who undergo device implantation (aim: 7 participants) who can complete robotics testing activities
Timeframe: 3 - 24 months postop for all study participants
2
number of participants out of total who undergo device implantation (aim: 7 participants) who still have device successfully implanted at 24 months postop
Timeframe: 24 months postop for all study participants
. The patient must have adequate soft tissue bulk and muscle mass present in the operative limb to support appropriate wound healing.
. In the opinion of the investigator, normal cognitive function and absence of any physical limitations, addictive diseases or underlying medical conditions that may preclude the patient from being a good study candidate.
. Willingness, ability and commitment to participate in baseline and follow-up evaluations for the full length of the study.
. Willingness and ability to provide informed consent to participate in the study.
Exclusion criteria
. Subjects with any active skin disease in the tested limb.
. Subjects with severe co morbidity, atypical skeletal anatomy, or poor general physical/mental health that, in the opinion of the Investigator, will not allow the subject to be a good study candidate (i.e. other disease processes, mental capacity, substance abuse, shortened life. expectancy, vulnerable patient population, BMI \>40, etc.).
. For subjects who have not yet been implanted with the e-OPRA Implant System, subjects who would have less than 2 mm of remaining cortex bone available around the implant, if implanted.
. Subjects with advanced atrophic muscle and/or compromised soft tissue coverage in the operative limb.
. Subjects with evidence of or a documented history of severe peripheral vascular disease, diabetes mellitus (type I or type II), skin diseases, neuropathy or neuropathic disease and severe phantom pain, or osteoporosis, such that, in the opinion of the investigator, will not allow the subject to be a good study candidate.
. Subjects with a history of systemically administered corticosteroids, immune-suppressive therapy or chemotherapy drugs within six (6) months of implant surgery.
. Subjects with a known need of future MRIs.
. Subjects currently involved in another clinical study where that participation may conflict or interfere with the treatment, follow-up or results of this clinical study.