Each equipment reaches a fixed frequency preset of 12, 15 and 20 Hz measured by digital oscilloscope. This study shows the result of the development of others three tuning forks of different dimensions to generate different frequencies. The tuning fork is activated by squeezing the tips of the extensions together and releasing them in a sudden movement. The device is characterized by a bottom end containing a transducer with a diameter of 62 mm and a thickness of 5/16 mm (8''), a rod removable 148 mm, fork length of 362 mm and an extension at the upper end of sinuous shape bilaterally.The tuning forks must be applied at an angle of 90° directly on the chest wall of the patient after pulmonary auscultation for location of secretions. This device generated a frequency of 25 Hz and had a weight of 521 g, with dimensions of 600 mm in total length. The first tuning fork was made with a fixed frequency of 25 Hz and it was recorded in the Brazilian institution of patent registration. The aim of the present study is to develop tuning forks with different frequencies, for use in bronchopulmonary hygiene therapy. It is expected that a tuning fork is able to generate vibrations in the thorax, facilitating bronchial hygiene. The optimal vibration frequency to mobilize secretions is widely debated and varies between 3 and 25 Hz. The tuning fork therapeutic for the purpose of bronchial hygiene has still not been described in the literature. Both tests together form a standard test for the examination of hearing damage as well as of the eighth cranial nerve.The main function of the mucociliary system is the removal of particles or substances that are potentially harmful to the respiratory tract. Whereas the Weber test serves to compare the sound perception of each ear by means of bone transmition, the Rinne test compares air and bone transmition. Hildesheimer psychologist Heinrich Rinne (1819–1868) amended the test in 1855. Physiologist Ernst Heinrich Weber (1795–1878) of Leipzig first recorded this in experiment in 1825. The Weber experiment serves to identify a laterality of the sense of hearing with the use of a tuning fork. This tuning fork method for testing sensibility, which was first used in 1903, is still considered to be the most dependable and safe even today. Without the dampers, the instrument vibrates at a frequency of 128 Hz and is used for simple hearing and bone conductivity tests. The screwed-on plastic foot allows for a gentle transfer of the vibrations from the tuning fork to the patient. It is in this configuration that the tuning fork is used in vibration examinations. Reference marks for exact calibration of the original KaWe tuning fork can be found on the back side of the fork tines. With the screwed-on dampers, the fork vibrates at 64 Hz. This calibrated tuning fork has removable dampers with a 1/8 scale graduation and is used to identify a loss of the sense of vibrations, and is used to diagnose polyneuritis which can occur e.g. The graduated tuning fork developed by Rydel Seiffer c 128 Hz/C 64 Hz is a standard in the field of neurology and is also probably the most well-known neurological tuning fork. Every carefully-done, complete physical examination of a patient involves the use of a tuning fork. Medicinal tuning forks will forever be associated with names such as Weber and Rinne or Rydel Seiffer. Tuning forks for medical examination indispensable for complete patient examinations
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