LightNeedle - RJ Laser

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Cerebral and peripheral effects of laser needle-stimulation. Litscher G. Department of Biomedical Engineering and Research in Anesthesia and Critical Care, University of Graz, Auenbruggerplatz 29, A-8036 Graz, Austria. gerhard.litscher@uni-graz.at This study comprises scientific-theoretic fundamental investigations of laserneedle technology, a new and painless method of acupuncture stimulation. <strong>Laser</strong>needles are not inserted in the skin, but are merely placed on the surface of the acupuncture point. The study documents the significant changes in peripheral microcirculation (p = 0.005) and surface temperature of the skin (p = 0.02) induced by laser, in 22 healthy volunteers (mean age 24.4 +/- 2.6 years). In addition, a randomised cross-over study to characterise the specific changes in cerebral blood flow velocity with laserneedle acupuncture (p < 0.001) is presented. These results provide important information for characterising the effects of laserneedle acupuncture. PMID: 14579790 [PubMed - indexed for MEDLINE]
EFFECTS OF NEW NONINVASIVE LASERNEEDLES ON BRAIN FUNCTION G. Litscher*, D. Schikora** * Department of Biomedical Engineering and Research in Anesthesia and Critical Care, University of Graz, Graz, Austria ** Department of Physics and Optoelectronic, University of Paderborn, Paderborn, Germany Abstract: This paper describes the first double-blind study in acupuncture research in 17 healthy volunteers using laserneedle acupuncture. Stimulation of vision related acupoints resulted in marked changes of mean blood flow velocity in the posterior cerebral artery measured by multidirectional transcranial Doppler sonography. Further studies using different laser stimulus intensities and wavelengths are in progress. Keywords: laser, laserneedle, acupuncture, brain function, blood flow velocity Introduction A new noninvasive laserneedle system has been developed and used for the first time in acupuncture research [1,2]. This new optical stimulation technique has the advantage that the stimulation cannot be felt by the patient. The operator may also be unaware of whether the laserneedle system is active and therefore for the first time true double blind studies in acupuncture research can be performed. Materials and Methods The laser radiation is coupled into eight optical fibres and the laserneedles are arranged at the distal ends of the optical fibres. Due to the direct contact of the laserneedles and the skin, no loss of intensity occurs and the laser power, which affects the acupoints, can be exactly determined [1,2]. Simultaneous and continuous transtemporal Doppler sonographic examinations of the posterior cerebral artery (PCA) and the middle cerebral artery (MCA) were performed to objectify alterations of cerebral blood flow velocity. Seventeen healthy volunteers with a mean age of 25.1 + 4.1 years (⎺x + SD) were examined. Eight vision related distal acupoints (Hegu, Zusanli, Kunlun, Zhiyin) on both sides and 8 placebo points were tested using two schemes, each in one session in a randomized double-blind cross-over study design. The data before (a), during (b - d), and after (e) laserneedle acupuncture (Fig.1) were tested with Kruskal-Wallis one way ANOVA on ranks (SigmaStat, Jandel Scientific Corp., Erkrath, Germany). Fig. 1: Measurement profile. Results The results of the alterations of mean blood flow velocities in the PCA and MCA before (a), during (b - d), and after (e) laserneedle and placebo acupuncture are summarized in Table 1. Tab. 1: Changes in mean blood flow velocity (vm; ⎺x + SE) in 17 healthy volunteers during laserneedle (A) and placebo (B) acupuncture. Note the increase of vm at the conditions b - d (* n.s.) during A. v m (cm/s) A: PCA B: PCA A: MCA B: MCA a 42.2 ± 2.5 42.9 ± 2.6 48.0 ± 3.1 47.5 ± 3.2 b 44.7 ± 2.7 * 41.6 ± 2.7 48.0 ± 3.2 45.9 ± 3.1 c 43.9 ± 2.6 41.6 ± 2.7 47.6 ± 3.2 45.7 ± 3.1 d 44.1 ± 2.6 41.9 ± 2.4 48.6 ± 3.1 45.9 ± 3.0 e 42.3 ± 2.4 42.1 ± 2.8 46.8 ± 3.2 46.2 ± 3.1 Discussion Recent scientific and technological progress has truly revolutionized acupuncture. The usage of advanced exploratory tools, such as laser Doppler flowmetry, laser Doppler imaging, ultrasound or magnetic resonance imaging, provides revealing insights and attempt to shine scientific light upon the most spectacular of the eastern medical procedures [3-9]. Similar like in animal studies we have found recently that the brain is the key to acupuncture’s and laserpuncture’s effects. New experimental constructions to measure ultrasound, light and bioelectrical processes can reproducibly demonstrate effects of stimulation of acupoints in the brain [1,3-9]. Streitberger and Kleinhenz [10] have reported that the stimulus strength at the acupuncture points are of
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