Hijjawi, Plast Reconstr Surg 2006 - Improved Myoelectric Prosthesis Control Accomplished Using Multiple Nerve Transfers

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Improved Myoelectric Prosthesis Control Accomplished Using Multiple Nerve Transfers

Hijjawi, Dumanian, et al.·Plast Reconstr Surg·2006·157 citations·Case series

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Background

The control of shoulder-level disarticulation prostheses is significantly more difficult than that of prostheses for more distal amputations. Amputees have significant difficulties coordinating the separate functions of prosthetic shoulder, elbow, wrist, and hand/hook components. The user must lock one joint at a particular position in space before subsequently moving a different joint.

Methods

A patient with bilateral humeral disarticulations after an electrical injury underwent a novel nerve transfer procedure designed to improve the control of a myoelectric prosthesis.
The median, radial, ulnar, and musculocutaneous nerves were transferred to the nerves of segments of the pectoralis major and minor muscles.
Those muscles then act as bioamplifiers of peripheral nerve signals when the normal upper extremity nerves are activated by the patient's brain.
Therefore, when the patient thinks "flex elbow," the transferred musculocutaneous nerve fires, and a segment of the pectoralis major contracts.
An electromyographic signal is then detected transcutaneously and causes the prosthetic elbow to flex.

Results

Three of the four nerve transfers were successful.
One of the nerve transfers unexpectedly yielded two separate controllable muscle segments.
Standardized testing using a "box-and-blocks" apparatus was performed with the patient's previous myoelectric device and the current device after nerve transfers.
The patient's performance improved by 246 percent.

Conclusions

Nerve transfers to small muscle segments are capable of creating a novel neural interface for improved control of a myoelectric prosthesis. This is done using standard techniques of nerve and flap surgery, and without any implantable devices.

Copyright remains with the authors and publisher.

Improved Myoelectric Prosthesis Control Accomplished Using Multiple Nerve Transfers.

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Improved Myoelectric Prosthesis Control Accomplished Using Multiple Nerve Transfers

Hijjawi, Dumanian, et al.·Plast Reconstr Surg·2006·157 citations·Case series

|

Background

The control of shoulder-level disarticulation prostheses is significantly more difficult than that of prostheses for more distal amputations. Amputees have significant difficulties coordinating the separate functions of prosthetic shoulder, elbow, wrist, and hand/hook components. The user must lock one joint at a particular position in space before subsequently moving a different joint.

Methods

A patient with bilateral humeral disarticulations after an electrical injury underwent a novel nerve transfer procedure designed to improve the control of a myoelectric prosthesis.
The median, radial, ulnar, and musculocutaneous nerves were transferred to the nerves of segments of the pectoralis major and minor muscles.
Those muscles then act as bioamplifiers of peripheral nerve signals when the normal upper extremity nerves are activated by the patient's brain.
Therefore, when the patient thinks "flex elbow," the transferred musculocutaneous nerve fires, and a segment of the pectoralis major contracts.
An electromyographic signal is then detected transcutaneously and causes the prosthetic elbow to flex.

Results

Three of the four nerve transfers were successful.
One of the nerve transfers unexpectedly yielded two separate controllable muscle segments.
Standardized testing using a "box-and-blocks" apparatus was performed with the patient's previous myoelectric device and the current device after nerve transfers.
The patient's performance improved by 246 percent.

Conclusions

Nerve transfers to small muscle segments are capable of creating a novel neural interface for improved control of a myoelectric prosthesis. This is done using standard techniques of nerve and flap surgery, and without any implantable devices.

Copyright remains with the authors and publisher.

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