970nm Details

Why is the 970nm (980nm class) wavelength important?

A laser's wavelength determines many of its properties and capabilities because different wavelengths are absorbed by tissue at varying rates.

Wavelength Chart

Absorption of Light Energy in Water

Tissue composition (amongst others):

    -Water

    -Hemoglobin

    -Melanin

Because soft tissue contains a high percentage of water (around 70%), it has a major impact for ablating soft tissue with a laser.

Absorption in hemoglobin is imperative for good coagulation and successful hemostasis.

The Absorption of Light Energy in Water is:

3% for 810nm
15% for 1064nm
35% for 980nm

Cecchetti W, Guazzieri C, Tasca A, Dal Bianco M, Zattoni F, Pagano F
980nm Diode Laser and Fiber Optic Resectoscope in Endourological Surgery
European Biomedical Optics Week, BiOS Europe '96


So why do you use a diode laser?

·Tissue can be readily vaporized

·Precise cuts with little or no bleeding can be obtained

·Combination of coagulation and precise tissue ablation

oCan provide patients with reduced post-operative pain and swelling with enhanced healing time

So why is 970nm wavelength so important?

·Good absorption in hemoglobin and oxy-hemoglobin

·Ten times more absorption in water than 810 nm

oThe increase in water absorption uses less conductive energy from a hot tip to the use of radiant energy for ablation

·Uses absorption of radiant energy to enhance vaporization compared to primarily using conductive (heat) energy

·Reduced need to initiate the fiber tip

·High absorption in water means that water can be used for cooling

oReduces the heat conduction from the laser fiber to the surrounding tissue

oReduces the conduction of excess heat through the tissue caused by a typically long laser pulse thus reducing excess thermal damage

oReduces collateral damage to surrounding tissue that is not targeted for treatment