Gutzmann Test

Gutzmann Test (Crutzmann) for voice disorders consists of the following. The patient is made to sustain a specific tone of the middle conversational register while applying slight pressure to the thyroid cartilage. If the pressure is suddenly reduced, the voice rises by approximately ¹/₂-1 tone and quickly returns to the original tone. In pathological cases, the voice deviates more significantly (approximately up to a third) and returns only slowly or not at all to the original position. The greater the disorder, the greater the deviation. This test gives pathological deviations in professional voice disorders as well as in various functional diseases of the nervous system.

Gooch Funnel (Gutsch), is a type of funnel used for the quantitative collection and weighing of precipitates. It has the shape of a crucible, but its bottom (in standard types) is mesh-like. A layer of crushed asbestos fibers is applied to this bottom, through which filtration is carried out. The latter is performed under reduced pressure. For this purpose, a piece of wide rubber tubing is placed over a glass tube (see illustration - so-called 'foreceps') and part of the latter is bent inward. Into the resulting rubber cuff, the G. funnel is inserted and connected to a suction flask via a rubber stopper. After washing the precipitate, it can be dried together with the G. funnel and even calcined, and then weighed. The advantage of the G. funnel is that the ashing of the paper filter is avoided, all manipulations are significantly simplified; for homogeneous determinations, the same filter can be used several times in succession. To clean the filter, it is treated with warm chromic mixture (potassium bichromate in sulfuric acid). Recently, abroad very convenient G. funnels with bottoms of porous porcelain, as well as glass G. funnels in which the bottom is formed by a porous plate of finely crushed fused glass ('Jenaer porose Glasfilter') have been manufactured. In both cases, the use of an asbestos interlayer becomes unnecessary.