Biomedical Engineering Reference
In-Depth Information
( A )
( B )
Figure 5.5 ( A ) Patient consulting for laser hair removal of axillary hair. ( B ) Result at 5 years after the fourth laser hair removal treatment.
Case 3
A 23-year-old male patient consulted for LHR on his back (Fig. 5.6A). Previous treatment modalities consisted of shaving or
waxing. He received seven treatments with an IPL source [Estelux, Palomar (Burlington, Massachusetts, USA)]. This device
produces smooth (nonspiky) pulses of very broad range from 0.5 to 500 ms. The spectrally fi ltered light is delivered through
a LuxY handpiece (530-1200 nm), optimized for hair removal. The handpiece has a builtin photon recycling system, which
returns photons that are refl ected from the skin back to the treatment target. The gain factor of photon recycling is in the
range of 1.1-1.5 times. With a large spot size (12 × 28 mm) and a repetition rate of 2 Hz, a covering rate can achieve 12 cm 2 /s.
A fl uence of 24 J/cm 2 at a 20-ms pulse was used. A gradual decrease of the regrowing hairs was obtained (Fig. 5.6B) until a
very nice result at 8 months after the last treatment was obtained (Fig. 5.6C).
( A )
( B )
( C )
Figure 5.6 ( A ) Patient with hairy back before IPL treatment; ( B ) result at 4 months after fourth IPL hair removal treatment; and ( C ) result at 8 months after
seventh IPL hair removal treatment. Abbreviation : IPL, intense pulsed light.
Case 4
A 38-year-old male patient consulted with a minor form of spina bifi da occulta. This condition is characterized by the failure of
the plates of bone that form the spinal arch to fuse completely. This variation generally only affects one vertebra, particularly the
vertebra lying lowest in the back. Because there are no associated abnormalities of the spinal cord or nerve roots, there are no leg,
bladder, or bowel problems. His symptoms consisted only of a small dimple with numerous hairs growing out of it (Fig. 5.7A).
 
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