Wuhan Dimed Laser Technology Co., Ltd
Dimedlaser - Proffessional Manufacture Of Medical Lasers
|Place of Origin:||China|
|Brand Name:||Dimed Laser|
|Minimum Order Quantity:||1set|
|Packaging Details:||Aluminum wheel case with carton box|
|Delivery Time:||About two weeks aftter payment|
|Payment Terms:||T/T, Western Union|
|Supply Ability:||50sets per month|
|Operation Mode:||CW, Single Or Repeat Pulse||Repetition Rate:||0.2Hz- 50KHz|
|Packing:||Aluminum Wheel Case|
PLDD Laser - for Percutaneous Laser Disc Decompression
The treatment principle of PLDD is based on the concept of the intervertebral disk being a closed hydraulic system. This system consists of the nucleus pulposus, containing a large amount of water, surrounded by the inelastic annulus fibrosus. An increase in water content of the nucleus pulposus leads to a disproportional increase of intradiskal pressure. In vitro experiments have shown that an increase of intradiskal volume of only 1.0 mL causes the intradiskal pressure to rise by as much as 312 kPa (2340 mmHg). On the other hand a decrease of intradiskal volume causes a disproportionally large decrease in intradiskal pressure. The radicular pain that characteristically accompanies lumbar disk herniation is the result of nerve root compression by the herniated portion of nucleus pulposus. A reduction of intradiskal pressure causes the herniated disk material to recede toward the center of the disk, thus leading to reduction of nerve root compression and relief of radicular pain.
In PLDD, this mechanism is exploited by application of laser energy to evaporate water in the nucleus pulposus. Laser energy is delivered by a laser fiber through a hollow needle placed into the nucleus pulposus. The needle is placed into the intervertebral disk under local anesthesia. Apart from evaporation of water, the increase in temperature also causes protein denaturation and subsequent renaturation. This causes a structural change of the nucleus pulposus, limiting its capability to attract water and therefore leading to a permanent reduction of intradiskal pressure by ≤57%.
The procedure is conducted under local anesthesia of the skin and underlying muscles. After assessment of the correct disk level by using fluoroscopy, a hollow needle is inserted 10 cm from the midline, pointing toward the center of the disk. When the needle is in place, its correct position is verified by using biplanar fluoroscopy, sometimes in combination with CT imaging. A laser fiber (0.4 mm) is inserted through the needle into the center of the nucleus pulposus. Laser energy is then delivered into the nucleus pulposus to vaporize its content and reduce intradiskal pressure.
A Herniated disk before PLDD
B Application of laser energy into the nucleus pulposus
C Herniated disk after PLDD
D CT image after PLDD, showing a gas-containing cavum in the nucleus pulposus.