ABSTRACT
Objective To design and apply a portable arm bracket for patients undergoing PICC placement and to solve the problem of raising and placing the arm during PICC placemen and promote comfort level.Methods Ninety-eight patients were provided with portable arm bracket between August and November in 2016 as the experimental group,82 patients were provided with wood board between April and July in 2016 as the control group.The comfort degree,placement success rate,number of multiple attempts to insert needle and advance guidewire,and case of abnormal events were compared between two groups.Results Level 1 comfort in the experimental group was higher than the control group,and level 2,3 and 4 comfort in the experimental group were lower than the control group,and differences were statistically significant (P＜0.001).Placement success rate of the experimental group(98.0％) was slightly higher than that of the control group(93.9％),but the difference was not statistical significant (P=0.31).The number of multiple attempts to insert needle and advance guidewire in the experimental group was lower than the control group,and the difference was statistically significant(P＜0.05).Abnormal events occurred in 3 cases in the experimental group and the incidence rate was 3.1％;there were 6 cases in the control group and the incidence rate was 7.3％.Conclusion The shelve and raising function of the portable arm bracket boost patients' catheter comfort degree,improve the success rate of catheterization and reduce the occurrence of complications cases.
ABSTRACT
A series of linear 2,5-tetraphenylsilole-vinylene-type polymers were successfully synthesized for the first time. The tetraphenylsilole moieties were linked at their 2,5-positions through a vinylene bridge with p-dialkoxybenzenes to obtain polymer PSVB and with 3,6-carbazole to obtain polymer PSVC. For comparison, 2,5-tetraphenylsilole-ethyne-type polymer PSEB was also synthesized, in which the vinylene bridge of PSVB was replaced with an ethyne bridge. Very interestingly, the bridging group (vinylene or ethyne) had a significant effect on the photophysical properties of the corresponding polymers. The fluorescence peak of PSEB at 504â nm in solution originated from the emission of its silole moieties, whereas PSVB and PSVC emitted yellow light and no blueish-green emission from the silole moieties was observed, thus demonstrating that the emissions of PSVB and PSVC were due to their polymer backbones. More importantly, the 2,5-tetraphenylsilole-ethyne polymer exhibited a pronounced aggregation-enhanced emission (AEE) effect but the 2,5-tetraphenylsilole-vinylene polymer was AEE-inactive. Moreover, both AEE-active 2,5-tetraphenylsilole-ethyne polymer and AEE-inactive 2,5-tetraphenylsilole-vinylene polymers were successfully applied as fluorescent chemosensors for the detection of explosive compounds.
ABSTRACT
A novel series of ladder π-conjugated materials--sila-pentathienoacenes (Si-PTA) are synthesized and characterized. Crystal structures of the compounds show that the length of alkyl chains substituting on the thiophene ring has a significant influence on molecular packing. A densely packed structure with an interfacial distance of about 3.66 Å between the adjacent molecules is observed for the compound with shorter alkyl chains. However, a large interfacial distance (7.99 Å) is obtained for another compound because of the insertion of long alkyl chains between two planes. The investigation of the optical and electrochemical properties shows that the silylene bridge incorporated into the pentathienoacene framework exerts a clear effect on the electronic properties by the σ*-π* conjugation. Although only a slight enhancement is observed for the HOMO levels, with respect to that of pentathienoacene, the LUMO levels are significantly lowered. The observed electronic properties are consistent with the theoretical calculations.
