Phantom Neuro begins human trials of prosthetic interface

Phantom Neuro has completed the first human implantations of its Phantom X prosthetic-control interface, beginning clinical evaluation of a system that detects electrical activity from residual-limb muscles and converts it into wireless commands for powered prostheses. The procedures took place at Cabrini Health in Melbourne, Australia, as part of the company’s ongoing CYBORG early feasibility study.

Phantom Neuro announced the milestone on 20 October 2026, confirming that the initial participants had received the investigational implant during outpatient procedures lasting approximately one hour each, without general anaesthesia. These are the first implantations of the company’s sensor in people, following the approval of its first-in-human study in April. The announcement does not establish completed evidence of long-term device safety or improved prosthetic function.

Phantom X is designed to obtain signals associated with intended movements of a missing hand or wrist. Following an upper-limb amputation, muscles remaining in the residual limb can still produce electrical activity when a person attempts particular movements. Suitable sensors can record aspects of that activity and provide information for a prosthetic control system.

The interface is positioned beneath the skin over the relevant muscles rather than directly contacting the brain or peripheral nerves. Phantom Neuro’s approach therefore differs from implanted neural interfaces that require electrodes to be placed on or within nervous tissue, although it still involves an implanted medical device and an associated surgical procedure.

Electrical activity in skeletal muscle results from the activation of muscle fibres by motor nerves. As groups of fibres become active, they generate voltage changes that can be measured by suitably positioned electrodes. These measurements contain information about muscle activation, but they also include contributions from neighbouring tissue, background interference and the electrical characteristics of the measurement interface.

Conventional myoelectric prostheses frequently use electrodes positioned on the skin within a prosthetic socket. Their performance can depend on contact between the electrodes and the body, the position of the socket and conditions such as perspiration or movement. Changes in contact can alter the recorded signals even when the wearer attempts a similar action.

Phantom Neuro aims to address some of those limitations through subcutaneous sensing. Placing the interface over the residual muscles may provide a different electrical measurement arrangement from surface electrodes, although the long-term behaviour of the implanted interface must still be evaluated as tissue conditions and daily activity change.

The device is intended to transmit the recorded information wirelessly to external equipment. Signal-processing software then interprets the measurements and generates commands suitable for a compatible powered prosthesis. The receiving system must coordinate those commands with the motors, control electronics and mechanical movements available in the artificial limb.

Interpreting muscle signals requires more than detecting that a voltage change has occurred. The control system must determine which movement the wearer intends, using patterns recorded from the available muscles. Where several movements produce overlapping activity, classification and calibration become important to distinguishing commands reliably.

Muscle condition, residual-limb anatomy and patterns of activation can differ between participants. A control model developed for one wearer may therefore require adjustment before it can be applied to another. Calibration can also be affected by fatigue, posture and changes in how the device or external equipment is positioned.

Command timing is another consideration. A powered hand must respond promptly enough for the wearer to coordinate its movement, but a very fast response has limited value if the selected action is incorrect or inconsistent. The complete system’s performance depends on signal acquisition, processing, wireless transmission and the response of the prosthetic hardware.

Wireless operation removes the need for a direct electrical connection passing continuously through the skin to the external controller. It also creates requirements for reliable communication, power management and suitable behaviour if the connection is interrupted. The October announcement does not provide a complete set of measured communication latency, signal stability or system availability results for the implanted participants.

Phantom X remains an investigational device. Its electronics and packaging must function in a biological environment while maintaining appropriate electrical characteristics. Long-term evaluation needs to examine the condition of the implant and surrounding tissue, the consistency of the recorded signals and the consequences of repeated movement during ordinary activities.

The CYBORG study was authorised in Australia earlier in 2026 and is designed to enrol up to ten participants with unilateral upper-limb loss below the elbow. The clinical programme includes implantation, recovery, prosthetic fitting and an extended period of evaluation, rather than treating successful surgery as the endpoint of the investigation.

The original study plan specifies approximately two weeks of recovery before participants are fitted with compatible prosthetic equipment, followed by an evaluation period of approximately 20 weeks. Individual schedules may vary according to clinical requirements and study procedures. The October milestone concerns the initial implantations, not the completion of that planned follow-up.

Plastic and reconstructive surgeon Michael Lo performed the procedures at Cabrini Health. ProMotion Prosthetics and Enable Rehab provide associated prosthetic care, occupational therapy and testing, bringing the implant into a broader programme of device fitting, training and functional assessment.

Rehabilitation is necessary because control of a powered prosthesis depends on both the electronics and the person’s ability to produce recognisable commands. Participants may need to learn how different attempted movements affect the device and how to coordinate those signals with the mechanical capabilities of the prosthetic hand.

Functional evaluation can examine whether intended commands are recognised consistently, whether the prosthesis executes the correct movements and how reliably tasks can be completed. Performance during a supervised test may differ from use during everyday activities, where the wearer encounters changing positions, objects and environmental conditions.

Phantom Neuro describes the approximately one-hour procedures and the absence of general anaesthesia as evidence supporting its intended minimally invasive approach. Those procedural characteristics are relevant to the implantation method, but they cannot independently establish the safety of long-term use or rule out complications.

The study’s clinical findings will also need to distinguish implantation outcomes from functional benefits. Successful placement of an interface demonstrates that the device can be introduced through the planned procedure, while effective prosthetic control requires separately documented results showing how the implanted system performs over time.

Phantom Neuro has not published completed CYBORG results demonstrating sustained improvements in movement selection, daily task performance or quality of life. The company also states that Phantom X has not been approved for commercial use. Regulatory progress associated with an investigational technology is separate from authorisation to supply it routinely as a medical device.

The first implantations allow the research team to begin collecting evidence from human use of the interface. Further assessment will determine whether the recorded signals, wireless connection and external control system can support reliable prosthetic operation while meeting the clinical safety and usability requirements of the study.