In Vitro Degradation Behavior of Absorbable Interface Screws / 中国医疗器械杂志

The composite material PLGA compounded with β-tricalcium phosphate (β-TCP) was prepared by melt blending method, and the absorbable interface screw was prepared by injection molding process. Prepare PBS buffer that simulates human body, conduct in vitro degradation experiments on interface screws according to relevant national and industry standards, then test and characterize interface screws at different time points for degradation of intrinsic viscosity, average molecular weight distribution, mass loss, mechanical properties and thermal properties. According to the degradation performance-time curve, determine the time node at which the interface screw loses the mechanical properties. In this paper, the in vitro degradation behavior of interfacial screws prepared from PLGA and β-TCP composites was studied in detail, providing a reference and basis for the degradation behavior of absorbable products prepared from PLGA and β-TCP composites.

The application of three-dimensional CT in diagnosis of the branchial cleft cyst and fistula / 临床耳鼻咽喉头颈外科杂志

The patient complained of finding on the right side of the neck fistula with discharge nine years. In recently, fistula spills significantly increased compared with the previous. Special physical examination: Right sternocleidomastoid middle 1/3 front border is seen here in a small fistula, translucence jelly secretion were spilling out when squeezeing the fistula, no smell. Ultrasound: On the right side of the upper cervical skin to submandibular gland rear could see tubular low echo area. MRI: Visible on the right side of the neck tube signal, after the submandibular gland rear. Three-dimensional CT: Visible on the right side of the neck by skin sinus crossings as deep as the tonsillar fossa lumen containing contrast agent. Clinical diagnosis: The second branchial cleft cyst and fistula.

Clinical analysis of rectal cancer in patients younger than 40 years old / 中国普通外科杂志

Objective To investigate the clinicopathological characteristics,treatment methods and prognosis of rectal cancer in patients younger than 40 years old.Methods From Jan,1998 to Dec,2003,325 treated rectal cancer patients with complete surgical records were divided into two groups:young patients group(younger than 40 years old)49 patients,accounted for 15.1%;middle and old patients group(older than 40years old)276 patients,accounted for 84.9%.The clinicopathological characteristics,treatment methods and follow-up data were compared.Results Among the younger patients,cancer in middle and lower segments of rectum accouned for 79.6%(39/49),infiltrative cancer accounted for 55.1%(27/49),mucous and low-differentiated cancer accounted for 83.7%(41/49),cancer invasion of serosa occurred in 87.8%(43/49),lymph node metastasis in 75.5%(37/49),Miles operation was performed in 65.3%(32/49)and Dixon operation in 34.7%(17/49).These characteristics differewed significantly from middle-aged and old patients.And the 5-year survival-rate in youn patient group was 32.7% and in middle and old patient proup was 60.9% respectively,(P