The modern reflex hammer is referred to as a Tomahawk or Taylor reflex hammer and was designed by John Taylor in 1888. That is the most well known one in the US. There is also the Babinski reflex hammer and it was developed in 1912 by Joseph Babinski and it is often seen in neurological settings.

there is no such thing as a negative babinski reflex, but a "negative" babinski is a physiological response to a mechanical stimulus of the foot plant.

it is usually called plantar reflex or, flexor plantar response.

this is a test used to determine the continuity of the corticospinal tract, and sould therefore be "negative" in healthy subjects.

infants until 24 months, may show a positive babinski due to the incomplete growth of the cerebrum.

brssard reflex

babinski's

Babinski's sign