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Improvements in and to methods and apparatus for removal of skin pigmentation and tattoo ink

A technology for skin and treatment methods, used in applications, phototherapy, radiation therapy, etc., to solve the problems of inconsistent, time-consuming, and inaccurate laser radiation

Pending Publication Date: 2021-02-26
LIGHTSENSE ISRAEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is an inherently imprecise procedure and involves a highly unavoidable overlap of successive pulses on the skin with simultaneously increased additional damage to the tissue
Therefore, it is evident that manual placement of laser radiation is inconsistent, inaccurate, and time-consuming, and may exacerbate the damage to the skin caused by this existing laser treatment method

Method used

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  • Improvements in and to methods and apparatus for removal of skin pigmentation and tattoo ink
  • Improvements in and to methods and apparatus for removal of skin pigmentation and tattoo ink
  • Improvements in and to methods and apparatus for removal of skin pigmentation and tattoo ink

Examples

Experimental program
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Effect test

Embodiment 1

[0174] in the attached picture figure 1A skin treatment facility according to an embodiment of the invention is schematically shown. The equipment is arranged in two adjacent rooms 12 , 13 separated by a partition wall 21 . One of the rooms 12 is a treatment room; the other is a laser room 13 housing a first and a second treatment laser 1,2. In this embodiment, the first laser 1 is an 800 nm titanium sapphire laser producing ultrashort pulses, and the second laser 2 is a 1064 nm and 532 nm Nd:YAG laser. The Ti:Sapphire laser emits pulses of 100-30,000 femtoseconds at a pulse repetition rate of 1Khz at an energy of 1-10 mJ. Nd-Yag lasers emit sub-nanosecond pulses at similar energies and at a pulse repetition rate of 500 Hz. It will be appreciated that different lasers may be used in other embodiments of the invention. As described below, the aiming beam 5 is optically coupled to the treatment lasers 1, 2 to assist in placing the working head 4, described in more detail bel...

Embodiment 2

[0191] The use of ultrashort and ultrahigh intensity radiation according to the invention facilitates the removal of several colors with one wavelength over highly color selective linear absorption. When designing a new system, the proper laser operating point must be determined to achieve multicolor pigment removal. Operating points include fluence, pulse width and intensity. The intensity is required to be high enough to remove many colors and is usually determined by a combination of fluence (energy density) and pulse width. Flux should be high enough to support strength, but not so high as to cause undue damage (typically around 0.5-10J / cm 2 ). The pulse width should be short, but is usually limited by the specific laser design. A preferred pulse width is about 0.5-30 picoseconds. Pulse energy is discussed in Example 3 below. The optimum operating point depends on the wavelength of the particular laser, the color of the object (more is usually better), and the availab...

Embodiment 3

[0199] The process of laser pigment removal, while targeting the pigment, generates localized heat in the tissue surrounding the pigment. Although localized damage in the pigmented tissue is unavoidable, surrounding tissue (not directly damaged by pigmented radiation absorption) will be subjected to secondary heating. Locally increased duration of heating is at the root of higher damage to surrounding tissue. In the examples below, we quantify these effects.

[0200] During irradiation of pigmented tissue, the following occurs: Initially, on the time scale of the laser pulse width, the radiation is absorbed in the absorbing portion of the tissue, usually in the specific chromophore targeted by the therapy . These can reach very high temperatures (even thousands of degrees) on very short picosecond or nanosecond timescales. This often results in plasma generation, mechanical failure, and / or other dramatic events, which are often the desired effects of therapy. After a short...

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Abstract

Methods and apparatus for dermatological laser treatment, e.g. for the removal of unwanted tattoos or other skin pigmentation. Removal of multiple colours with a single pulsed laser beam may be achieved using intensities in excess of about 50 GW / cm2. Methods for reducing the pain and tissue damage associated with laser tattoo removal include using a spot size of less than 2 mm with a fluence in the range 0.5-10 J / cm2. Scanning the laser beam over an area of skin to be treated allows such areas to be treated accurately with scanning patterns calculated to promote rapid dissipation of heat awayfrom treated portions of the skin. Multiple treatment rooms may be served by a single pulsed treatment laser by beam toggling, splitting or pulse-picking to minimise downtime of the laser.

Description

technical field [0001] The present invention relates to the removal of unwanted skin pigmentation and tattoo ink and encompasses various improvements in methods and apparatus therefor. Background technique [0002] Tattooing and other pigmentation of the skin involves placing pigment into the skin's dermis, the layer of tissue just below the epidermis, usually about 2mm thick. After the initial injection, the pigment disperses throughout the uniform damaged layer down through the epidermis and upper dermis, both of which the presence of foreign bodies activates phagocytes of the immune system to engulf the pigment particles. As the treatment progresses, the damaged epidermis exfoliates (removes superficial pigment) while deepening in the form of dermal granulation tissue, which is then transformed into connective tissue by the growth of collagen. This repairs the upper dermis, where the pigment becomes lodged within continuously proliferating macrophages, eventually concent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B18/20H01S3/10
CPCA61B18/203A61B18/201A61B2018/00458A61B2017/00769A61B2018/20359A61N2005/0659A61N5/0616A61N5/0625A61B2018/00642A61B2018/00904A61B2018/00708A61B2018/00678A61N2005/0663A61B2018/20353A61B2018/20361A61B2018/00684A61N5/067A61B2018/20355A61B34/30A61B2090/364A61B2090/373A61B90/50A61B2018/20553A61B17/00A61B2017/00061A61B2017/0019A61B2018/00779
Inventor 丹·多夫·格罗斯曼欧迪·罗卜盖伊·恩格尔埃罗尔·达梅林贾里德·阿伦·艾森伯格
Owner LIGHTSENSE ISRAEL LTD
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