https://www.google.com/patents/US5199442
Three images are at the link for this patent.
This paragraph from example#2 is relevant;
The overall effectiveness is summarized as follows: Six or roughtly 40% expereinced excellent relief of their spasticity as judged by both their personal assessment and the neurological exam. Four or 29% experienced good reduction in spasticity and another 29% experienced no relief at all. The mean duration of effect was 9 hours with a range of 3-24 hours. On occasion, subjects experienced relief from several days up to a week.
We claim:
1. Apparatus for reducing spacticity of neurologically impaired patients comprising:
a)
an elongated anal probe which is adapted to apply stimulus to a
patient's pelvic floor, said probe defining a distal penetrating end and
a proximal end, an axially aligned channel formed between ends therein
with at least three conduits emanating radially therefrom, said probe
further defining three longitudinally extending cavities therein, each
said cavity being connected to one each of the conduits; three elongated
bipolar electrodes, one each being secured in a corresponding cavity
and extending above a ventral surface of the probe;
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