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In order to achieve energy saving and environmental protection, the research and utilization of solid waste polyurethane is realized. Using monocomponent di-propylene glycol (PG) and polyethylene glycol (PEG) as the alcoholysis agent of the two-component diols, alkali metal sodium hydroxide as the metal catalyst, and montmorillonite clay (MMT) as the modifier, the degradation products were utilized to re-prepare montmorillonite/polyurethane nanocomposites with excellent performance, and to re-prepare nano-foam materials. And a series of tests and analyses were carried out on the degradation products and nanofoam materials. The results show that when m(PG): m(PEG) = 40: 60, sodium hydroxide is 1.0 g, montmorillonite addition is 0.3 g, the polyurethane nanomaterials can achieve the best degradation effect, the apparent density of the newly prepared nano-foam material is 0.05 g/cm3, the compressive strength is 0.41 MPa. At this time, the nano-foam material has a smaller thermal conductivity and better cold-retaining performance, and meets the requirements of the national standard. [ABSTRACT FROM AUTHOR]

Objective: To investigate the short-term clinical effect of lumbar nerve root canal injection under X-ray angiography in the treatment of sciatica., Methods: The clincal data of 78 patients with sciatica underwent lumbar nerve root canal injection under X-ray angiography from December 2017 to February 2020 was retrospectively analyzed. Including 31 males and 47 females, aged from 22 to 88 years old with a median of 65 years. There were 55 cases of lumbar disc herniation and 23 cases of lumbar spinal stenosis, the course of disease ranged from 1 to 8 weeks with a median of 3 weeks. There were 71 cases of single segment disc herniation or stenosis, including L 3,4 of 5 cases, L 4,5 of 61 cases, L 5 S 1 of 5 cases, and 7 cases of multisegment herniation or stenosis. The pain visual analogue scale (VAS) was recorded and Macnab was used to evaluate the clinical effect., Results: All patients completed standardized treatment without serious adverse reactions. VAS were (3.21±0.76) scores immediately after treatment, (2.89±0.33) scores 1 hour after treatment, (1.80±0.27) scores 6 hours after treatment, (1.10±0.20) scores 24 hours after treatment, (2.53±0.35) scores 1 week after treatment and (4.27±0.36) scores 1 month after treatment. There were significant differences in VAS between before treatment(7.83±0.56) and each time period after treatment( P <0.05). According to Macnab low back pain evaluation standard, 42 cases were effective, 34 cases were markedly effective and 2 cases were ineffective within 24 hours after treatment, with an effective rate of 97.4%;38 cases were effective, 25 cases were markedly effective, 15 cases were ineffective within one week after treatment, the effective rate was 80.0%;32 cases were effective, 22 cases were markedly effective, 24 cases were ineffective within one month after treatment, the effective rate was 69.2%., Conclusion: The short-term clinical effect of nerve root canal injection under X-ray radiography in the treatment of sciatica is good and it is an effective method to relieve sciatica.

To establish the local quality standard for Dendrobii devoniani caulis from Longling, Yunnan, the pharmacognostic characteristics microscopic characteristics and TLC identification were developed. Sulfuric acid-phenol method was used to determine the content of polysaccharide. An HPLC method was adopted to determine the content of mannose, and extractives were determined according to the procedures recorded in the Appendix of Chinese Pharmacopoeia(2010). The results showed a strong characteristics microscopic of Dendrobii devoniani caulis, and its TLC identification had a good resolution with clear spots; the content of polysaccharide is 35.7% -52.1% (average 42.7%), mannose 27.8%-46.1% (average 35.8%), and extract 4.5%-10.6% (average 7.38%). The method is simple, accurate and reliable, with good reproducibility. The established standard is acceptable for quality evaluation of Dendrobii devoniani caulis from Longling, Yunnan.