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Acoustic Devices for Skin Treatment
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A skin, sound wave technology, applied in applications, medical science, ultrasonic therapy, etc., can solve the problems of limitation, difficult to manufacture, expensive and so on
Active Publication Date: 2022-03-08
TOOSONIX AS
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Problems solved by technology
Systems known to operate at such high frequencies are inherently difficult and expensive to fabricate and have significant limitations on the depth to which human skin or other media may penetrate due to the frequency-dependent attenuation of propagating ultrasound waves
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example 1
[0107] Acoustic transducers for skin treatment include the following piezoelectric components:
[0108]
[0109] In some embodiments, coupling medium 40 is a low loss medium capable of conducting acoustic waves from focusing transducer 9 to the skin surface above PoT 8 . The coupling medium preferably matches the acoustic impedance of the skin tissue, therefore water is used as the coupling medium 40 in a preferred embodiment.
[0110] In another embodiment, the low-loss medium 40 consists of an acoustic coupling medium, which may be selected from at least the following group: aqueous medium, acoustic coupling gel, aqueous polyacrylamide, hydrogel, methyl methacrylate, collagen / Mixture of polymers (polyacrylic acid), polyvinyl alcohol, etc.
[0111] acoustic window
[0112] Figure 13 An exploded three-dimensional isometric cross-sectional view of the transducer head 11 with the acoustic window 200 is shown. Acoustic window 200 may provide acoustic coupling and physic...
example 2
[0144] The piezoelectric spherical focusing element needs to operate at the fundamental thickness resonance frequency of 20MHz. Therefore, assume that the speed of sound in the piezoelectric element is equal to c p =4000m / s, the necessary wall thickness h can be calculated according to the following formula:
[0145]
example 3
[0147] A piezoelectric spherical focusing element as in Example 2 needs to have a third harmonic resonant frequency f at a thickness of about 20 MHz 3 operate. Therefore, the necessary wall thickness h can be calculated by the following formula:
[0148]
[0149]
[0150] Table 1:
[0151]
[0152] Piezoelectric elements are usually machined from brittle piezoelectric ceramics to obtain the desired thickness and shape. At thicknesses below 200 μm, piezoelectric ceramics themselves are very difficult to handle and difficult to process due to their low mechanical integrity. Therefore, since the thickness of the element is about three times that of the element operating at the fundamental frequency, it is advantageous to use the third harmonic resonance. This is especially true for the frequency range above 10MHz.
[0153] Given the relatively small size characteristic of the skin, small and well-controlled lesions are required in PoT. Therefore, it is necessary to ...
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Abstract
The invention discloses a sound generating device for treating skin. In a preferred embodiment of the sound generating device, piezoelectric transducers are placed at various locations above the skin, and focused sound waves of 7 MHz or higher are transmitted into the skin. The focal point of the focused sound waves is located between 0.1mm and 5mm below the skin surface. The design of the piezoelectric transducer and the frequency of operation are carefully chosen to produce a treatment spot of the desired size and shape. The correct amount of energy is supplied to the treatment site to produce a lesion of the desired size and shape. The lesions are spaced and positioned to achieve treatment of the skin.
Description
[0001] Cross References to Related Applications [0002] This patent application claims U.S. Provisional Patent Application Serial No. 62 / 465,742 filed March 1, 2017, U.S. Provisional Patent Application Serial No. 62 / 541,634 filed August 4, 2017, and U.S. Provisional Patent Application Serial No. 62 / 541,634 filed August 4, 2017 Priority to U.S. Provisional Patent Application Serial No. 62 / 542,217 filed on March 7, the entire contents of which are incorporated herein by reference. technical field [0003] This patent document relates to an acoustic device and its use in a method and system for treating skin. In particular, this patent document relates to the use of an acoustic device for removing tattoos from the dermis and epidermis of humans. Background technique [0004] figure 1 The basic physiology of human skin 6 is shown. Human skin 6 consists of an outer epidermis 1 separated by a basement membrane 2 towards a deeper dermis 3 and an even deeper subcutaneous layer 4...
Claims
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