98%(136)133 out of 136 people found this document helpful
This preview shows page 9 - 11 out of 30 pages.
*Bell end piece has a natural frequency which varies with amount of pressure exerted. It transmits low-pitched sounds when very light pressure is used and with firm pressure, the skin converts it to a diaphragm end piece.*Stereophonic is a type of acoustic stethoscope which differentiates between the right and leftauscultatory sounds using a two-channel design.2. Magnetic Stethoscope:*Single end piece is the diaphragm, contains an iron disk on the interior surface behind this is a permanent magnet and a strong spring keeps the diaphragm bowed outward when it is not compressed against a body surface. Compression of the diaphragm activates the air column as magnetic attraction is established between the iron and the magnet, rotations of a dial adjusts for high, low, and full-frequency sounds. 3. Electronic Stethoscope:*Picks up vibrations transmitted to the surface of the body and converts them into electrical impulses. The impulses are amplified and transmitted to a speaker, where they are reconverted to sound. Newer devices have extended listening ranges, digital readout, sound recording and storage, playback, and electronic device linkage.Otoscope•Provides illumination for examining the external auditory canal and the tympanic membrane. An attached speculum narrows and directs the beam of light. Select the larges size of speculum that will fit comfortably into the patient’s ear canal.•Can be used for nasal examination if nasal speculum not available.•The pneumatic attachment for the otoscope is used to evaluate the fluctuating capacity of the tympanic membrane. Ophthalmoscope•The ophthalmoscope has a system of lenses and mirrors that enables visualization of the interior structures of the eye. The instrument has a light source that projects through various apertures while you focus on the inner eye. The large aperture, the one used most often, produces a large round beam.The various apertures are selected by rotating aperture selection dial. •The lenses in varying powers of magnification are used to bring the structure under examination into focus by converging or diverging light. An illuminating lens indicator displays the lens number positioned in the viewing aperture. The number correspond to the magnification power of the lens. The positive numbers are shown in black with the negative numbers are shown in red (just remember when your negative $ you’re in the red). The system of plus and minus lenses can compensate for myopia or hyperopia in both the examiner and the patient, there is no compensation for astigmatism.
•PanOptic Ophthalmoscope: The panoramic ophthalmoscope head uses an optimal design that allows a larger field of view and increases magnification. Fundus view is 5 times larger than a standard ophthalmoscope.