柔顺膝关节康复器结构及控制技术研究

【作者】 胡海燕；

【导师】 李小宁；

【作者基本信息】 南京理工大学 ， 机械制造及其自动化， 2009， 硕士

【摘要】 持续被动运动(Continuous Passive Motion,简称CPM)是目前膝关节损伤患者术后康复训练的重要方法。传统的CPM康复训练器械多是机械-电机式的,虽然可以达到很高的位置精度,但为患者提供的是刚性、被动的锻炼。传统的CPM机与患者的刚性接触容易对患者造成二次伤害;另一方面,被动运动无法满足患者康复后期肢体的肌肉力量训练要求,而大量的临床观察和统计表明:术后进行主-被动综合训练与只进行被动训练相比,可明显减轻患者疼痛,加快关节功能康复。因此,研究开发一种柔顺的主-被动结合的新型膝关节康复训练器,具有重要的学术意义和实际应用价值。围绕这一目标,论文完成的主要工作和取得的成果有:(1)论文首次研究并提出了一种利用气动人工肌肉和气缸串联组成复合驱动器作为动力源的新型柔顺膝关节康复器械新结构。利用气动人工肌肉的柔顺性,克服了传统CPM机只提供刚性训练的弊端。利用气缸的长行程解决了气动肌肉行程短导致膝关节弯曲角度小的技术难题。通过单独控制气缸两腔压力来灵活驱动活塞自由伸缩,实现了膝关节康复器主动训练功能。(2)为了实现不同康复阶段对不同训练要求的控制,对膝关节康复器的控制系统进行研究。根据研究的实际情况,确定了PC机+数据采集卡的控制方法,软件控制平台选择LabVIEW软件对传感器和控制阀进行控制。各训练参数在模块中均可调,满足了人机交互要求。通过控制各驱动器工作压力及压力变化方式,实现了膝关节康复器的周期、平稳动作。(3)研究建立了柔顺膝关节康复器的理论模型,并对柔顺康复器样机的工作特性进行了试验研究。结果表明:康复器在被动和主动运动方式下的最大转角分别为82°和130°。在试验对象体重为45kg的情况下,康复器完成一个弯曲伸展周期的时间为25s,速度为6°/s,平均角加速度为2.5°/s~2。试验结果同时表明康复器满足了柔顺性和主.被动训练相结合的功能要求。所研发的柔顺膝关节康复器实现了柔顺性和主-被动训练相结合的功能要求,同时整个康复器样机结构紧凑,重量轻,具有很好的应用前景。更多还原

【Abstract】 Continuous Passive Motion (CPM for short) is the important method at present of rehabilitation training for knee joint injuries sufferer after operation. But the traditional CPM machines are mostly driven by machinery and motor which provide position with high precision but high rigid and only passive motion. It can easily cause secondary damage to patients while training. On the other hand the passive motion can’t meet the demand of muscle strength training in the later rehabilitation period. However most clinical observation and statistics shows that: compared with totally passive training, passive training combining with active training after operation can relieve pain and promote functional recovery of the knee joint. So to design a new compliant and active rehabilitation apparatus has great scientific significance and application value.According to these objects, the main contents and achievements in this thesis are summarized as follows:(1) The thesis has put forward for the first time using pneumatic muscle actuator (PMA for short) connecting in series with pneumatic cylinders as the compound actuator to study a new compliant knee joint rehabilitation apparatus. Using the compliance of the PMA has overcome the traditional CPM shortcoming of only providing rigid training. The stroke of PMA is short and could not provide enough stroke to the knee joint, however the pneumatic cylinder has long stoke which can solve this problem. By respectively controlling the pressure of two cavities of the cylinder, the piston can move controllably in the pneumatic cylinder which has realized the active training for the apparatus.(2) In order to control different training demands in different rehabilitation steps, the thesis has researched on the control technology of the rehabilitation apparatus. Through considering the actual condition of the research, the method of using PC with data acquisition card has been chosen. The software of LabVIEW has been chosen to control the sensor and valves. The control module has been built for test in which all the parameters can be adjusted to meet the demands of human-computer interaction. With control program to control the pressure and its change, the apparatus can move periodically and steadily.(3) The research has built the theoretical model of the compliant knee joint rehabilitation apparatus and tested its performance. The experiments show that under the passive motion the maximum turning angle is 82°while 130°under active motion, the apparatus can completed the motion in 25 seconds with speed of 6°per second and acceleration of 2.5°/s~2 when carrying a person of 45kg. which has met the demands of rehabilitation training. Also through tests, the apparatus has been proved to be able to provide both compliance and active motion.The results show that, using PMAs connecting in series with pneumatic cylinders as the new actuator can meet the new demands of compliance and active motion on the rehabilitation apparatus. Also the whole machine is compact and light, it will have great application prospect.更多还原