Читать книгу Microneedling - Группа авторов - Страница 13

Most pens utilize sterile single‐use cartridges and variable needle length to be able to customize the treatment depending on the unique characteristics of the patient’s skin and the area being treated. They are automated and the physician has the ability to adjust the needle length for customized treatment options and the pressure and depth during treatment can be more uniform (see Figure 1.3) [16].

The pen itself is reusable, and most pens have a protective disposable sleeve. The needle tips are the disposable/consumable in these devices. Because of their size the tips are able to treat curved and small areas such as the nasal ala and the periocular and perioral areas. Most devices have a rechargeable battery that operates in two modes: high speed mode (700 cycles/minute) and low speed mode (412 cycles/minute) in a vibrating stamplike manner [17].

Figure 1.3 Pen: Single‐use cartridge with adjustable frequency and needle length.

Source: Sakurra/Shutterstock.

The devices contain multiple fine needles, ranging from 0.5 to 1.5 mm in length, that are rolled onto the skin. Needles between 1.5 and 3.0 mm are available but are preferred for the use of scars and damaged skin. The roller device is a drum‐shaped tool with a cylindrical head that is rolled back and forth to induce thousands of tiny pores in the stratum corneum and papillary dermis.

The length of needle selected for an individual patient depends upon the indication for microneedling and on the thickness of epidermis and dermis of the skin being treated. For treating acne and other scars, on average a needle length of 1.5–2 mm is utilized. When microneedling is used as a procedure to treat skin aging and wrinkles, a needle length of 0.5 mm or 1.0 mm is recommended [18]. The frequency interval for microneedling depends upon the indication for which the procedure is being done as well as the needle length of the dermaroller device used. Microneedling generally requires more than one session and a series of treatments is usually recommended.

Five basic types of medical dermarollers, which are registered with the FDA, have been described in the dermaroller series by Anastassakis and most dermarolling devices are adopted from these elementary types [19].