Design and Clinical Application of CPM Device Specialized For Infant Hip Joint
CHEN Biao1，HU Dayong2，WANG Jingjing3，LIANG Zhen1
1. School of Biomedical Engineering, Anhui Medical University, Hefei Anhui 230032, China丨 2. Department of Pediatric
Orthopedics, Southeast Surgery Hospital of Hefei, Hefei Anhui 230001, China丨 3. Hefei Huijia Medical Technology Co., Ltd., Hefei
Anhui 230001, China
Abstract：Objective To design a device for continuous passive motion (CPM) of the hip joint in infants, and to analyze the
therapeutic effect on the developmental dysplasia of the hip (DDH). Methods The device consisted of a host and a movable
bracket. The host completed human-computer interaction and regulated the high-pressure gas input from the outside. The movable
stent was a new dynamic frog abduction stent, which is driven by high-pressure gas leading the joint of infants to complete
CPM. The performance parameters of the device met the design goals. After obtaining the medical device registration certificate,
29 children (41 hips) were treated with CPM, and the acetabular index and the iliac angle were compared before and after the
treatment. Results After 2 months of clinical treatment, the acetabular index was decreased from 34.5±1.0 to 30.1±1.0, and the
iliac angle was raised from (50.2±1.2)° to (52.4±1.3)°. The differences were statistically significant (P<0.01). Conclusion The device is
suitable for infants, and it has a positive therapeutic effect on infant DDH. Also, it provides a new idea for the treatment of infant
DDH.
陈彪1，胡大勇2，王晶晶3，梁振1. 婴幼儿髋关节CPM仪的开发与临床应用[J]. 中国医疗设备, 2021, 36(6): 35-39.
CHEN Biao1，HU Dayong2，WANG Jingjing3，LIANG Zhen1. Design and Clinical Application of CPM Device Specialized For Infant Hip Joint. China Medical Devices, 2021, 36(6): 35-39.
