Welch Allyn MicroTymp 3 Handle Instructions d'exploitation télécharger pdf (Page 37)

Appendix A

A-33

Patent Tympanostomy Tube or Perforated Tympanic Membrane

In the case of a tympanic membrane perforation or a patent tympanostomy

tube, the air pressure produced by the MicroTymp2 Handle escapes through

the perforation or tube so that a pressure differential across the eardrum

does not occur. Because the air pressure changes have no effect on the

tension of the eardrum, the tympanogram is flat with an unusually high

equivalent ear canal volume. If the volume exceeds 2.5 cc, the MicroTymp2

Handle will not record a tympanogram at all, and the OPEN message will

appear. See Figure 28.

Flat Tympanogram Persistent OPEN

with too High Volume Message (can’t seal ear)

Figure 28

The Normal Ear

An example of a tympanogram from a normal ear is depicted in Figure 29.

Figure 29

-400 -200 0 200

0.5

1.0

PRESSURE - daPa

Ya - mmho

+200 Vea - cc

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 71 72

Pas de commentaire

Welch Allyn MicroTymp 3 Handle Instructions d'exploitation Page 37