We present a systematical study on comparison between water and dry coupling in photoacoustic tomography of the humanfinger joints.Compared to the direct water immersion of thefinger for water coupling,the dry couplin...We present a systematical study on comparison between water and dry coupling in photoacoustic tomography of the humanfinger joints.Compared to the direct water immersion of thefinger for water coupling,the dry coupling is realized through a transparent PDMSfilm-based water bag,which ensures water-free contact with the skin.The results obtained suggest that the dry cou-pling provides image quality comparable to that by water coupling while eliminating the wrin-kling of thefinger joint caused by the water immersion.In addition,the dry coupling offers more stable hemodynamic images than the water coupling as the water immersion of thefinger joint causes reduction in blood vessel size.展开更多
Based on flexible pneumatic actuator(FPA),bending joint and side-sway joint,a new kind of pneumatic dexterous robot finger was developed.The finger is equipped with one five-component force sensor and four contactless...Based on flexible pneumatic actuator(FPA),bending joint and side-sway joint,a new kind of pneumatic dexterous robot finger was developed.The finger is equipped with one five-component force sensor and four contactless magnetic rotary encoders.Mechanical parts and FPAs are integrated,which reduces the overall size of the finger.Driven by FPA directly,the joint output torque is more accurate and the friction and vibration can be effectively reduced.An improved adaptive genetic algorithm(IAGA) was adopted to solve the inverse kinematics problem of the redundant finger.The statics of the finger was analyzed and the relation between fingertip force and joint torque was built.Finally,the finger force/position control principle was introduced.Tracking experiments of fingertip force/position were carried out.The experimental results show that the fingertip position tracking error is within ±1 mm and the fingertip force tracking error is within ±0.4 N.It is also concluded from the theoretical and experimental results that the finger can be controlled and it has a good application prospect.展开更多
Trauma, osteoarthritis and rheumatoid arthritis can destroy the articulating cartilage in small and large joints, especially in the metacarpo [tarso] phalangeal (MCP/MTP) and phalangeal-phalangeal (PIP) joints. Single...Trauma, osteoarthritis and rheumatoid arthritis can destroy the articulating cartilage in small and large joints, especially in the metacarpo [tarso] phalangeal (MCP/MTP) and phalangeal-phalangeal (PIP) joints. Single piece finger prosthetic designs can reduce pain and correct aesthetic issues, with problems on contemporary designs including decreased stability, lack of fixation and loss of functionality. The examined implants are representative models of currently available total joint replacement (TJR) designs for MCP replacement, such as the Swanson one piece implant. These implants have been shown clinically to have a high failure rate (up to 90%), but the cause of failure is unknown. Compressive studies using a 50 N force and medial-lateral loads of 50 N perpendicular to the longitudinal axis of the arms of the implant were individually applied. Due to material failings, lower values had to be used in some cases. Maximum stress values were found for flexion loading;the Swanson approximation had a peak stress of 8.71 GPa at the interface of the joint arm and the flexion center, Neuflex had 0.188 GPa peak stress at the fixation center of the arm, and in the center of the joint, and the Avanta design had a 5.20 GPa peak stress at the flexion center. The location and concentration of stresses on the models correspond to literature searches for clinical data, showing that the main failure mechanism for these implants is due to primary flexion-extension natural movement of the joint.展开更多
Gout is one of the most common inflammatory arthritides that predominantly affects the first metatarsophalangeal joint. The underlying inflammatory process is elicited by the deposition of monosodium urate (MSU) cryst...Gout is one of the most common inflammatory arthritides that predominantly affects the first metatarsophalangeal joint. The underlying inflammatory process is elicited by the deposition of monosodium urate (MSU) crystals in the affected joint that are termed tophi and which may in the course of chronic gout progress into subcutaneous depositions of tophi. In this case report, we present a patient (PID: 6925981) who was seen in our outpatient department with a first episode of tophaceous gout in the finger, an infrequently seen condition that mostly affects older men with long-term gout. We discuss the case in view of the current literature on diagnosis and treatment of tophaceous gout.展开更多
Brachydactyly is a general term that refers to disproportionately short fingers and toes and forms a part of the group of limb malformations characterized by bone dysostosis. Brachydactyly usually occurs either as an ...Brachydactyly is a general term that refers to disproportionately short fingers and toes and forms a part of the group of limb malformations characterized by bone dysostosis. Brachydactyly usually occurs either as an isolated malformation or as a part of a complex malformation syndrome. Brachydactyly is classified as types A, B, C, D, or E;brachymetatarsus IV;Sugarman brachydactyly;or Kirner deformity. Various types of isolated brachydactyly are rare, except for types A3 and D. We describe a 15-year-old girl with isolated brachyphalangism of the basal finger bones of the little finger with symptoms of tenosynovitis. Tenosynovitis might be caused by growth deviation between the flexor digitorum superficialis and the flexor digitorum profundus. The patient responded very well to surgical treatment.展开更多
基金supported by the Natural National Science Foundation of China(NSFC)(61701076)
文摘We present a systematical study on comparison between water and dry coupling in photoacoustic tomography of the humanfinger joints.Compared to the direct water immersion of thefinger for water coupling,the dry coupling is realized through a transparent PDMSfilm-based water bag,which ensures water-free contact with the skin.The results obtained suggest that the dry cou-pling provides image quality comparable to that by water coupling while eliminating the wrin-kling of thefinger joint caused by the water immersion.In addition,the dry coupling offers more stable hemodynamic images than the water coupling as the water immersion of thefinger joint causes reduction in blood vessel size.
基金Project(2009AA04Z209) supported by the National High Technology Research and Development Program of ChinaProject(R1090674) supported by the Natural Science Foundation of Zhejiang Province,ChinaProject(51075363) supported by the National Natural Science Foundation of China
文摘Based on flexible pneumatic actuator(FPA),bending joint and side-sway joint,a new kind of pneumatic dexterous robot finger was developed.The finger is equipped with one five-component force sensor and four contactless magnetic rotary encoders.Mechanical parts and FPAs are integrated,which reduces the overall size of the finger.Driven by FPA directly,the joint output torque is more accurate and the friction and vibration can be effectively reduced.An improved adaptive genetic algorithm(IAGA) was adopted to solve the inverse kinematics problem of the redundant finger.The statics of the finger was analyzed and the relation between fingertip force and joint torque was built.Finally,the finger force/position control principle was introduced.Tracking experiments of fingertip force/position were carried out.The experimental results show that the fingertip position tracking error is within ±1 mm and the fingertip force tracking error is within ±0.4 N.It is also concluded from the theoretical and experimental results that the finger can be controlled and it has a good application prospect.
文摘Trauma, osteoarthritis and rheumatoid arthritis can destroy the articulating cartilage in small and large joints, especially in the metacarpo [tarso] phalangeal (MCP/MTP) and phalangeal-phalangeal (PIP) joints. Single piece finger prosthetic designs can reduce pain and correct aesthetic issues, with problems on contemporary designs including decreased stability, lack of fixation and loss of functionality. The examined implants are representative models of currently available total joint replacement (TJR) designs for MCP replacement, such as the Swanson one piece implant. These implants have been shown clinically to have a high failure rate (up to 90%), but the cause of failure is unknown. Compressive studies using a 50 N force and medial-lateral loads of 50 N perpendicular to the longitudinal axis of the arms of the implant were individually applied. Due to material failings, lower values had to be used in some cases. Maximum stress values were found for flexion loading;the Swanson approximation had a peak stress of 8.71 GPa at the interface of the joint arm and the flexion center, Neuflex had 0.188 GPa peak stress at the fixation center of the arm, and in the center of the joint, and the Avanta design had a 5.20 GPa peak stress at the flexion center. The location and concentration of stresses on the models correspond to literature searches for clinical data, showing that the main failure mechanism for these implants is due to primary flexion-extension natural movement of the joint.
文摘Gout is one of the most common inflammatory arthritides that predominantly affects the first metatarsophalangeal joint. The underlying inflammatory process is elicited by the deposition of monosodium urate (MSU) crystals in the affected joint that are termed tophi and which may in the course of chronic gout progress into subcutaneous depositions of tophi. In this case report, we present a patient (PID: 6925981) who was seen in our outpatient department with a first episode of tophaceous gout in the finger, an infrequently seen condition that mostly affects older men with long-term gout. We discuss the case in view of the current literature on diagnosis and treatment of tophaceous gout.
文摘Brachydactyly is a general term that refers to disproportionately short fingers and toes and forms a part of the group of limb malformations characterized by bone dysostosis. Brachydactyly usually occurs either as an isolated malformation or as a part of a complex malformation syndrome. Brachydactyly is classified as types A, B, C, D, or E;brachymetatarsus IV;Sugarman brachydactyly;or Kirner deformity. Various types of isolated brachydactyly are rare, except for types A3 and D. We describe a 15-year-old girl with isolated brachyphalangism of the basal finger bones of the little finger with symptoms of tenosynovitis. Tenosynovitis might be caused by growth deviation between the flexor digitorum superficialis and the flexor digitorum profundus. The patient responded very well to surgical treatment.
