Thermoresponsive and Biodegradable Amphiphilic Block Copolymers with Pendant Functional Groups

BACKGROUND: To develop the biodegradability and thermoresponsive hydrogel, in this work we designed a pendant-functionalized, thermoresponsive, amphiphilic block copolymer. METHODS: Methoxy poly(ethylene glycol) (MPEG)-b-[poly(ε-caprolactone)-ran-poly(ε-caprolactone-3-one)-ran-polylactic acid] (MCL) and (MPEG-b-[PCL-ran-POD-ran-PLA]) [MCL-(CO)] block copolymers were prepared by ringopening polymerization of ε-caprolactone, OD and lactide monomers. The subsequent derivatization of MCL-(CO) provided MPEG-b-[PCL-ran-poly(ε-caprolactone-3-COOH)-ran-PLA] [MCL-(COOH)] with COOH pendant groups and MPEG-b-[PCL-ran-poly(ε-caprolactone-3-NH2)-ran-PLA] [MCL-(NH2)] with NH2 pendant groups. RESULTS: The measured segment ratios of MCL-(CO), MCL-(COOH), and MCL-(NH2) agreed well with the target ratios. The abundances of the COOH and NH2 groups in the MCL-(COOH) and MCL-(NH2) copolymers were determined by 1H- and 13C-nuclear magnetic resonance spectroscopy, and agreed well with the target abundances. MCL-(CO), MCL-(COOH), and MCL-(NH2) formed homogeneous, white, opaque emulsions at room temperature. Rheological analysis of the block copolymer suspensions indicated a solution-to-hydrogel phase transition as a function of temperature. The solution-to-hydrogel phase transitions and the biodegradation of MCL-(CO), MCL-(COOH), and MCL-(NH2) were affected by varying the type (ketone, COOH, or NH2) and abundance of the pendant groups. CONCLUSION: MCL-(CO), MCL-(COOH), and MCL-(NH2) with ketone, COOH, and NH2 pendant groups showed solution-to-hydrogel phase transitions and biodegradation behaviors that depended on both the type and number of pendant groups.

Clinical observation on anal pendant expansion after PPH of mixed hemorrhoid treated with acupuncture at Xialiao (BL 34) and Changqiang (GV 1) / 中国针灸

<p><b>OBJECTIVE</b>To compare the difference in the clinical efficacy on anal pendant expansion after PPH (procedure for prolapse and hemorrhoids) of mixed hemorrhoid between acupuncture at Xialiao (BL 34) and Chang-qiang (GV 1) and oral administration of diosmin.</p><p><b>METHODS</b>Sixty cases of mixed hemorrhoids after PPH were randomized into an observation group and a control group, 30 cases in each one. In the observation group, since the 1st day, acupuncture had been applied to Xialiao (BL 34) and Changqiang (GV 1). The needles were retained for 30 min afterarrival, and the treatment was given once a day, totally for 7 days. In the control group, diosmin tablets had been prescribed for oral administration since the 1st day, 0.9 g each time, twice a day, totally for 7 days. The degree, persistent time and the pain score of anal pendant expansion were compared on the 1st, 2nd, 3rd and 7th days after PPH between the two groups and the efficacy was evaluated.</p><p><b>RESULTS</b>On the 1st day after PPH, the diffe-rences in the scores of the degree and persistent time of anal pendant expansion were not significant statistically between the two groups (all>0.05), but the pain score in the observation group was lower than that in the control group (<0.05) and lower than that before treatment (<0.05). On the 2nd, 3rd and 7th days after PPH, the degree and persistent time of anal pendant expansion and pain score in the two groups were all lower than those before treatment (all<0.05). The results in the observation group were better than those in the control group (all<0.05). At the end of treatment (on the 7th day after PPH), the total effective rate in the observation group was higher than that in the control group[90.0% (27/30) vs 83.3% (25/30),<0.05].</p><p><b>CONCLUSIONS</b>Acupuncture at Xialiao (BL 34) and Changqiang (GV 1) achieves the superior efficacy on anal pendant expansion after PPH of mixed hemorrhoids as compared with diosmin tablets.</p>

Clinical curative effect of pendant laparoscopic uterine fibroids divest and factor analysis of recurrence / 中国医师进修杂志

Objective To compare the chnical curative effect between pendant laparoscopic and traditional laparoscopic apphed in uterine fibroids divest,and analyze the risk factors of recurrence after resection of uterine fibrnids.Methods According to the different methods,130 patients with uterine fibroids were divided into suspension group (pendant laparoscopic uterine fibroids divest) and control group (traditional laparoscopic uterine fibroids divest),and 65 cases in each group.The intraoperative blood loss,operative time,exhaust time,heating duration,laparoscopic drainage were recorded,and the complications and the factors of recurrence were evaluated.Results The operative time,intraoperative blood loss,laparoscopic drainage in suspension group was less than that in control group [(53.5 ±20.9) min vs.(100.8 ± 26.7) min,(92.7 ± 18.9) ml vs.(168.4 ± 19.6) ml,(94.3 ± 13.8) ml vs.(186.5 ± 24.7) ml],the complications rate in suspension group was lower than that in control group [3.08％ (2/65) vs.33.85％ (22/65)],and there was significant difference (P ＜ 0.05).Followed up for 1-3 years,the recurrence rate was 29.23％ (38/130),3 cases were recurred within 3-6 months in control group,no recent recurrence in suspension group.Among them,the menarche age ≤13 years old,multiple myoma,operation age ＜ 35 years old were correlated with recurrence (P＜ 0.01 or ＜ 0.05).Conclusions Pendant laparoscopic uterine fibroids divest is fast and safe in operation and the prognosis effect significantly,faint pain degrees,myoma resection completely,short hospitalization period,less postoperative recurrence and other advantages,is worthy of reference for clinical promotion.The menarehe age ≤ 13 years old,multiple myoma,operation age ＜ 35 years old are correlated with recurrence.