THERAPEUTIC

LASER

Dr. Venkatesh

MPT(Neurology)

OVERVIEW Laser is an Acronym for the Light

amplification by the Stimulated emission of Radiation.

Therapeutic laser is also known as Soft laser, Cold laser, Low intensity laser, class III A B, optic laser

Laser is a beam of light which is used for various purposes.

HISTORY

Einstein 1953 Maser Optical Laser 1955 Dr.Theodre Maiman 1960 Bennet, Javan & Herriott

Electrical stimulating currents

Commercial radio & TV Short wave diathermy

Microwave diathermy

Infrared rays Visible light

Uoltraviolet Ionizing radiation

LASER{

RedRedRedRed

OrangeOrangeOrangeOrange

YellowYellowYellowYellow

GreenGreenGreenGreen

BlueBlueBlueBlue

VioletVioletVioletViolet

InfraredInfraredInfraredInfrared

UltravioletUltravioletUltravioletUltraviolet

PROPERTIES

1. Monochromaticity2. Coherence3. Collimation

CLASSIFICATION

1. Hot laser High intensity laser Surgical Laser Causes tissue heating Power > 60mW

2. Cold laser Low intensity laser Therapeutic Laser No Tissue heating Power < 60mW

TYPES

1.Helium Neon Laser : 632.8nm 2.Ruby Laser: 694.3nm 3.Gallium Laser : 750nm 4.Aluminum Laser : 780nm 5.Arsenide : 810nm 6.Diodes Laser :820nm 7.Carbon Dioxide : 10000nm

TYPES

Gas lasers Helium, neon, argon, carbon dioxide

Chemical lasers Hydrogen fluoride,

Solid laser Ruby laser

Diode Laser: like solid but works on electron

CLASSIFICATION Class I/1: Safe, cd players. Class II/2: 1 mW: blink reflex of eye will

prevent damage. up to 1 mW power, for example laser pointers.

Class IIIa/3R: 5 mW and staring into such a beam for several seconds is likely to cause (minor) eye damage.

Class IIIb/3B: immediate severe eye damage upon exposure. Usually lasers up to 500 mW, cd and dvd burners.

Class IV/4:burn skin, eye and/or skin damage. industrial and scientific lasers are in this class.

PRODUCTION

1.Principle of production 2.Functional Parts 3.Working 4.Parameters

FUNCTIONAL PARTS

1.Lasing medium

2.Energy Source

3.Mechanical Structure

PODUCTION

Energy

Lasing Medium LASER

Mechanical Structure

PARAMETERS

1.Security switch2.Timer3.Mode4.Sensor5.Fiber optic cable6.Probe7.Probe switch

EFFECTS OF LASER

1. Pain relief2. Tissue healing

PAIN RELIEF

G.C.T. Serotonin Endorphin secretion Acute & Chronic pain Pain site, trigger points, Acupuncture points

TISSUE HEALING Phagocytosis, Collagen Synthesis, Contracure CUMMING’S EXPERIMENT BIOSTIMULATION THEORY (Biochemical,

Physiological,Proliferative Proliferation offibroblasts,reepithelisation & remodelling)

PHOTOCHEMICAL THEORY Chromophores Biostimulation

BEFORE & AFTER LASER

BEFORE & AFTER LASER

INDICATIONS

1.Incisions2.Osteoarthritis3.Rheumatoid arthritis4.Ankle sprain5.Chronic Low back pain

INDICATIONS

6.Tennis Elbow7.Bicipital tendinitis8.Trigger Finger9.Chronic ulcers10.Wounds11.Tenosynovitis12.Carpal Tunnel Syndrome13.Periarthritis14.Sports injuries

CONTRAINDICATIONS

1. Pregnancy2. Neoplasms3. Exposure to Eye4. Hemorrhagic area5. Infected wounds6. Thrombosis

DOSAGES

2 TO 30 Seconds

Energy density = Power (W) Time (sec) Treatment Area ( cm²) 3 to 10 weeks Acute :Continuous Chronic: Pulsed (10- 20pps)