To observe the therapeutic effi cacy and the safety of imbecile He-Ne laser irradiating blood vessel (ILIB) in the treatment of diabetic peripheral neuropathy (DPN).

• 目的 :观察低能量氦氖激光血管内照射 (ILIB)治疗糖尿病性周围神经病 (DPN )的有效性及安全性。