Described embodiments include a system, an apparatus, and a method. A described system includes a portable energy source configured to supply electrical or radiant power and configured to be carried proximate to a first body portion of a health care provider. The system also includes a power-output connector configured to releasably couple with a power-receiving connector connected to a handheld medical device, the power-output connector configured to be carried proximate to a second body portion at a position distal of a shoulder joint of the health care provider. If coupled, the power-output connector and the power-receiving connector are operable to transfer the electrical or radiant power supplied by the portable energy source. The system further includes a connective structure configured to transfer the electrical or radiant power supplied by the portable energy source between the portable energy source and the power-output connector.