There are diverse products related to human buttocks, which need to be designed, manufactured and evaluated with 3D buttock model. The 3D buttock model used in present research field is just simple approximate model s...There are diverse products related to human buttocks, which need to be designed, manufactured and evaluated with 3D buttock model. The 3D buttock model used in present research field is just simple approximate model similar to human buttocks. The 3D buttock percentile model is highly desired in the ergonomics design and evaluation for these products. So far, there is no research on the percentile sizing system of human 3D buttock model. So the purpose of this paper is to develop a new method for building three-dimensional buttock percentile model in computer system. After scanning the 3D shape of buttocks, the cloud data of 3D points is imported into the reverse engineering software（Geomagic） for the reconstructing of the buttock surface model. Five characteristic dimensions of the buttock are measured through mark-points after models being imported into engineering software CATIA. A series of space points are obtained by the intersecting of the cutting slices and 3D buttock surface model, and then are ordered based on the sequence number of the horizontal and vertical slices. The 1st, 5th, 50 th, 95 th, 99 th percentile values of the five dimensions and the spatial coordinate values of the space points are obtained, and used to reconstruct percentile buttock models. This research proposes a establishing method of percentile sizing system of buttock 3D model based on the percentile values of the ischial tuberosities diameter, the distances from margin to ischial tuberosity and the space coordinates value of coordinate points, for establishing the Nth percentile 3D buttock model and every special buttock types model. The proposed method also serves as a useful guidance for the other 3D percentile models establishment for other part in human body with characteristic points.展开更多
Unrelieved pressure on load-bearing muscle tissues of humans can produce pressure ulcers. In a seated upright posture, the highest pressures occur inferior to the ischial tuberosities (ITs). Moreover, the vibration ca...Unrelieved pressure on load-bearing muscle tissues of humans can produce pressure ulcers. In a seated upright posture, the highest pressures occur inferior to the ischial tuberosities (ITs). Moreover, the vibration can initiate the development of pressure ulcer. Therefore, the seat cushion is not only used to lower the maximum seating pressure on buttocks but also minimize the transmission of vibration to human body. The purpose of this study was to investigate the effects of varying vertical vibration frequencies on seat-interface contact pressure during sitting on three different seat cushions by using a finite element modeling approach. A simplified two-dimensional human buttock-thigh model was developed to simulate the mechanical response of the muscle of buttocks and thigh under vertical vibration. Static and vibrational loads with five different frequencies of 0.1, 1, 10, 30 and 50 Hz and the same amplitude of 3 mm were applied to different seat cushions. The result showed that the “SAF 6060” seat cushion with both hyperelastic and viscoelastic behaviors could be effective in reducing the amplitude of varying maximum contact pressure, especially for the frequency of 10-20 Hz. This method could help in design of seat cushions with appropriate material properties and shape so as to reduce vibrations transmitted to human body at a certain frequency range.展开更多
Objective: Autologous fat-grafting for the purpose of breast augmentation has gained widespread acceptance as a viable and safe alternative to classical breast implant procedures and has recently been successfully app...Objective: Autologous fat-grafting for the purpose of breast augmentation has gained widespread acceptance as a viable and safe alternative to classical breast implant procedures and has recently been successfully applied to buttock augmentation. Due to the numerous patient re-positionings and widely variable OR time, these procedures present unique challenges for anesthesiologists. Our goal is to discuss the current surgical methods, anesthetic methods, risks and benefits of this procedure. Methods: This is a retrospective cohort study in the setting of the operating room. Twenty-nine consecutive cases of mega-volume fat transplantation, defined as >300 cc to an individual site, performed by one surgeon, were reviewed. Age, Body Mass Index, total fat injected, total operating room time, maximum intraoperative temperature, minimum intraoperative and temperature were measured. RESULTS: Our procedure has enjoyed a 100% patient satisfaction rate. Analysis reveals high variability in age (21 - 57), total fat injected (200 cc - 1990 cc), patient Body Mass Index (18.8 - 42.2) and total operating room time (1:23:00 - 6:14:00) for our procedures. There were no instances of major complications in this cohort. Conclusions: Autologous fat transplantation for the purposes of breast and buttock augmentation is an emerging technique that shows great promise and high patient satisfaction, but providing unique challenges for anesthesiologists and surgeons.展开更多
Introduction:Tuberculosis verrucosa cutis is a rare form of cutaneous tuberculosis and occurs commonly on the lower extremeties(hand,thighs and buttock).It is often missed as other cutaneous verrucosa dieases and the ...Introduction:Tuberculosis verrucosa cutis is a rare form of cutaneous tuberculosis and occurs commonly on the lower extremeties(hand,thighs and buttock).It is often missed as other cutaneous verrucosa dieases and the pathogens of cutaneous tuberculosis is difficult to find.We showed an unusual case of tuberculosis verrucosa cutis on both buttocks.Case presentation:A 54 Chinese male presented with 9-year history of asymptomatic verrucous lesions on bilateral buttocks.Lesions presented a well-defined plaque,verrucous lesion and yellow pus discharge on buttocks.The skin biopsy showed pseudoepitheliomatous hyperplasia of the epidermis and dermal granulomatous inflammation composed of epithelioid histiocytes and mixed inflammatory cells.The tuberculin test and the polymerase chain reaction for Mycobacterium tuberculosis were negative,but T-spot test were positive.the treatment of antituberculosis showed favourable effect.Finally,the diagnosis of tuberculosis verrucosa cuti was made.Discussion:Tuberculosis verrucosa cutis is easily confused with other verrucous diseases,such as verrucous porokeratosis,discoid lupus erythematosus hypertrophicus lichen planus,chromoblastomycosis.Diagnostic therapy is usually recommended for most of these diagnoses.Conclusion:A diagnosis of tuberculosis verrucosa cutis should be taken correctly based on the combination of clinical manifestions,histopathological characteristics,laboratory findings and diagnostic therapy.It is vital for dermatologists to be aware of verrucous lesions since a delay in diagnosis can lead to aggravate the disease,abuse of glucocorticoids.展开更多
IntroductionRosai-Dorfman disease (RDD),also called sinus histiocytosis with massive lymphadenopathy,is a rare,benign,idiopathic histiocytic proliferative disease.It is characterized by painless massive cervical lymph...IntroductionRosai-Dorfman disease (RDD),also called sinus histiocytosis with massive lymphadenopathy,is a rare,benign,idiopathic histiocytic proliferative disease.It is characterized by painless massive cervical lymphadenopathy.Additional symptoms may include fever,leukocytosis,polyclonal hypergammaglobulinemia,and an increased erythrocyte sedimentation rate.Cutaneous RDD (CRDD) is confined to the skin with no lymphadenopathy or other simultaneous phenomena.1-2 Pure CRDD accounts for only 3% of all described cases of RDD.3 We herein report an atypical case of CRDD in a woman with multiple nodules in the thighs and buttocks,which may improve the knowledge of this disease.展开更多
文摘There are diverse products related to human buttocks, which need to be designed, manufactured and evaluated with 3D buttock model. The 3D buttock model used in present research field is just simple approximate model similar to human buttocks. The 3D buttock percentile model is highly desired in the ergonomics design and evaluation for these products. So far, there is no research on the percentile sizing system of human 3D buttock model. So the purpose of this paper is to develop a new method for building three-dimensional buttock percentile model in computer system. After scanning the 3D shape of buttocks, the cloud data of 3D points is imported into the reverse engineering software（Geomagic） for the reconstructing of the buttock surface model. Five characteristic dimensions of the buttock are measured through mark-points after models being imported into engineering software CATIA. A series of space points are obtained by the intersecting of the cutting slices and 3D buttock surface model, and then are ordered based on the sequence number of the horizontal and vertical slices. The 1st, 5th, 50 th, 95 th, 99 th percentile values of the five dimensions and the spatial coordinate values of the space points are obtained, and used to reconstruct percentile buttock models. This research proposes a establishing method of percentile sizing system of buttock 3D model based on the percentile values of the ischial tuberosities diameter, the distances from margin to ischial tuberosity and the space coordinates value of coordinate points, for establishing the Nth percentile 3D buttock model and every special buttock types model. The proposed method also serves as a useful guidance for the other 3D percentile models establishment for other part in human body with characteristic points.
文摘Unrelieved pressure on load-bearing muscle tissues of humans can produce pressure ulcers. In a seated upright posture, the highest pressures occur inferior to the ischial tuberosities (ITs). Moreover, the vibration can initiate the development of pressure ulcer. Therefore, the seat cushion is not only used to lower the maximum seating pressure on buttocks but also minimize the transmission of vibration to human body. The purpose of this study was to investigate the effects of varying vertical vibration frequencies on seat-interface contact pressure during sitting on three different seat cushions by using a finite element modeling approach. A simplified two-dimensional human buttock-thigh model was developed to simulate the mechanical response of the muscle of buttocks and thigh under vertical vibration. Static and vibrational loads with five different frequencies of 0.1, 1, 10, 30 and 50 Hz and the same amplitude of 3 mm were applied to different seat cushions. The result showed that the “SAF 6060” seat cushion with both hyperelastic and viscoelastic behaviors could be effective in reducing the amplitude of varying maximum contact pressure, especially for the frequency of 10-20 Hz. This method could help in design of seat cushions with appropriate material properties and shape so as to reduce vibrations transmitted to human body at a certain frequency range.
文摘Objective: Autologous fat-grafting for the purpose of breast augmentation has gained widespread acceptance as a viable and safe alternative to classical breast implant procedures and has recently been successfully applied to buttock augmentation. Due to the numerous patient re-positionings and widely variable OR time, these procedures present unique challenges for anesthesiologists. Our goal is to discuss the current surgical methods, anesthetic methods, risks and benefits of this procedure. Methods: This is a retrospective cohort study in the setting of the operating room. Twenty-nine consecutive cases of mega-volume fat transplantation, defined as >300 cc to an individual site, performed by one surgeon, were reviewed. Age, Body Mass Index, total fat injected, total operating room time, maximum intraoperative temperature, minimum intraoperative and temperature were measured. RESULTS: Our procedure has enjoyed a 100% patient satisfaction rate. Analysis reveals high variability in age (21 - 57), total fat injected (200 cc - 1990 cc), patient Body Mass Index (18.8 - 42.2) and total operating room time (1:23:00 - 6:14:00) for our procedures. There were no instances of major complications in this cohort. Conclusions: Autologous fat transplantation for the purposes of breast and buttock augmentation is an emerging technique that shows great promise and high patient satisfaction, but providing unique challenges for anesthesiologists and surgeons.
文摘Introduction:Tuberculosis verrucosa cutis is a rare form of cutaneous tuberculosis and occurs commonly on the lower extremeties(hand,thighs and buttock).It is often missed as other cutaneous verrucosa dieases and the pathogens of cutaneous tuberculosis is difficult to find.We showed an unusual case of tuberculosis verrucosa cutis on both buttocks.Case presentation:A 54 Chinese male presented with 9-year history of asymptomatic verrucous lesions on bilateral buttocks.Lesions presented a well-defined plaque,verrucous lesion and yellow pus discharge on buttocks.The skin biopsy showed pseudoepitheliomatous hyperplasia of the epidermis and dermal granulomatous inflammation composed of epithelioid histiocytes and mixed inflammatory cells.The tuberculin test and the polymerase chain reaction for Mycobacterium tuberculosis were negative,but T-spot test were positive.the treatment of antituberculosis showed favourable effect.Finally,the diagnosis of tuberculosis verrucosa cuti was made.Discussion:Tuberculosis verrucosa cutis is easily confused with other verrucous diseases,such as verrucous porokeratosis,discoid lupus erythematosus hypertrophicus lichen planus,chromoblastomycosis.Diagnostic therapy is usually recommended for most of these diagnoses.Conclusion:A diagnosis of tuberculosis verrucosa cutis should be taken correctly based on the combination of clinical manifestions,histopathological characteristics,laboratory findings and diagnostic therapy.It is vital for dermatologists to be aware of verrucous lesions since a delay in diagnosis can lead to aggravate the disease,abuse of glucocorticoids.
基金supported by Natural Science Foundation of China(No.81572680 and No.81673043)
文摘IntroductionRosai-Dorfman disease (RDD),also called sinus histiocytosis with massive lymphadenopathy,is a rare,benign,idiopathic histiocytic proliferative disease.It is characterized by painless massive cervical lymphadenopathy.Additional symptoms may include fever,leukocytosis,polyclonal hypergammaglobulinemia,and an increased erythrocyte sedimentation rate.Cutaneous RDD (CRDD) is confined to the skin with no lymphadenopathy or other simultaneous phenomena.1-2 Pure CRDD accounts for only 3% of all described cases of RDD.3 We herein report an atypical case of CRDD in a woman with multiple nodules in the thighs and buttocks,which may improve the knowledge of this disease.
