【摘要】 背景:屈肌腱损伤都要进行吻接修复。目的:通过实验定量得出手指屈肌腱应力松弛和蠕变与时间的变化规律,为人工屈肌腱和临床外科吻接术提供黏弹性力学参数。设计、时间及地点:单因素实验,于2006-06-20/30在吉林大学力学实验中心完成。材料:实验标本取自正常国人急性头部创伤致死的新鲜尸体4具由白求恩医科大学解剖教研室提供,均为男性,年龄19～28岁。于死亡2h之内解剖尸体取下屈肌腱。方法:在日本岛津电子万能试验机上对手指屈肌腱各8个试样进行应力松弛、蠕变实验。模拟人体体温36.5℃的温度场下进行实验,应力松弛的应变增加速度为5%/s,蠕变实验的应力增加速度为0.05GPa/min。设定实验时间为7200s,采集100个数据以一元线性回归分析的方法处理实验数据。主要观察指标:①应力松弛曲线。②归一化应力松弛函数方程的计算。③蠕变实验曲线结果。④归一化蠕变函数方程计算结果。结果:手指屈肌腱应力松弛、蠕变最初600s变化较快,之后应力缓慢下降,应变缓慢上升,7200s应力松弛量为0.219MPa,7200s蠕变量为3.1%。结论:应力松弛曲线是以对数关系变化的,蠕变曲线是以指数关系变化的,其具有很好的黏弹性力学特性。更多还原

【Abstract】 BACKGROUND: Anastomosis is common performed in flexor tendon injuryBends the tendon damage to carry on the lips to meet the repair. OBJECTIVE: To obtain the the finger flexor through the experiment quota to bend the tendon stress relaxation and the change rule of creep and slow change and the time change rulethrough the experiment, so as to provide viscoelasticity mechanics parameter for artificial flexor tendon and bend the tendon and the clinical surgery anastomosis lips artificially meets the technique to provide the viscoelasticity mechanics parameter. DESIGN, TIME AND SETTING: Single factor experiment was performed at Mechanics Experimental Center of Jilin University from June 20th to 30th, 2006. MATERIALS: Four fresh flexor tendon specimens (within 2 hours) from corpses of acute head trauma, male, 19-28 years, were provided by Department of Anatomy, Norman Bethune Medical University. METHODS: Eighty test specimens of finger flexor tendon were placed on the Shimadzu AUTOGRAPH in electronic universal testing machine to the finger to carry onconduct the stress relaxation and creep, the slow change experiment. U under the dummy simulated man human body temperature (36.5 ℃) temperature field, 5%/s stress relaxation strain increases and 0.05GPa/min stress increases in the creep experiment. The experiment was performed for 7 200 seconds. 100 experimental data were collected. Normalized creep equation was calculated with regression analysis method. MAIN OUTCOME MEASURES: Stress relaxation curve; functional equation by normalized creep equation; creep curve; calculation results of functional equation. RESULTS: The initial 600s stress relaxation and creep of finger flexor tendon changed rapidly, and the stress gradually reduced afterward but strain gradually increased. The 7 200 s stress relaxation was 0.219 MPa, and 7 200 s creep was 3.1% CONCLUSION: Stress relaxation curve is changed with logarithm relationship; the creep curve is changed with index relationship, with good viscoelasticity mechanics properties.更多还原