A knife such as ophthalmologic surgeons use is often useful to the dermatologist. However, since the blade and handle are in one piece, the entire instrument must be discarded in case the blade is broken. It would produce a financial saving if a handle could be devised to be used with replaceable blades. Such an instrument can be improvised by insertion of a Hagedorn needle into a handle with a chuck. Handles of this nature may be obtained from laboratory and dental supply houses and are called dissecting needle holders or pin vises. The Hagedorn needle may need to be broken in half and the shank ground down to fit the chuck.
1617 Hawthorne Park.
Little RP. REPLACEABLE HAGEDORN NEEDLE WITH HANDLE AS SCALPEL. Arch Derm Syphilol. 1944;49(3):198. doi:10.1001/archderm.1944.01510090044013
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