The invention is directed toward stimulation of a selected tissue layer. A
device is attached to a target tissue by applying vacuum pressure to a
vacuum cavity of the device and advancing a needle into tissue within the
vacuum cavity. The depth on the vacuum cavity is selected to permit
deployment at the selected tissue layer. In one embodiment, the invention
is directed toward an implantable medical device comprising a device
housing defining a vacuum cavity, and a vacuum port for application of
vacuum pressure to draw tissue into the vacuum cavity, an electrode that
is movable into the vacuum cavity of the device housing to contact at
least a portion of the tissue drawn into the vacuum cavity, and a lead
comprising at least one conductor coupled to the electrode.