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
Background: Thigh lift is a common procedure in plastic surgery. Surgeon’s sense or tailor tacdundancy to bek is mainly the methods used for designing thigh lift currently. This article is an attempt to find a method...Background: Thigh lift is a common procedure in plastic surgery. Surgeon’s sense or tailor tacdundancy to bek is mainly the methods used for designing thigh lift currently. This article is an attempt to find a method/a reference point to define the exact amount of re excised. Introduction: Anthropometry reference measurements can be applied in designing thigh lift surgery. Classically, anthropometry binds the calf circumference with mid-thigh circumference and upper thigh (gluteal) circumference to make postoperative results more harmonious and natural. Method: To find out the anthropometrically referenced ratio of the calf circumference with mid-thigh circumference and upper thigh (gluteal) circumference, anthropometric databases and studies done on females addressing different ages, countries and races with average BMI (body mass index) were reviewed. Chosen studies should include the calf circumference, mid-thigh circumference and/or upper thigh (gluteal) circumference. Anthropometrically referenced upper and mid-thigh circumferences can be calculated preoperatively. Result: 64:92:100 was concluded as a pooled mean ratio out of nine different studies addressing the ratio of the calf circumference:mid-thigh circumference:upper thigh (gluteal) circumference. Conclusion: Postoperative anthropometrically referenced mid and upper thigh circumferences can be calculated by measuring the calf circumference and applying the 64:92:100 ratio. Markings are done intraoperatively using my innovated “Stab-Push-Pinch-Mark” or SPPM technique for drawing a rough surgical design, then tweaked using the anthropometrically referenced 64:92:100 ratio results.展开更多
Deformities in the body contouring population are rarely isolated to one area,and procedures can be combined to achieve more substantial results.While there is no formula for optimal surgical sequencing and timing,the...Deformities in the body contouring population are rarely isolated to one area,and procedures can be combined to achieve more substantial results.While there is no formula for optimal surgical sequencing and timing,there are certain principles which-when applied appropriately-can yield results that are reliable,aesthetically pleasing,and aligned with the patient’s desires and preferences.In this article,we outline our latest thinking in circumferential body contouring and how to integrate the lower body lift with procedures of the abdomen,upper body,breasts,back,and arms to achieve the complete 360°look.展开更多
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Background: Thigh lift is a common procedure in plastic surgery. Surgeon’s sense or tailor tacdundancy to bek is mainly the methods used for designing thigh lift currently. This article is an attempt to find a method/a reference point to define the exact amount of re excised. Introduction: Anthropometry reference measurements can be applied in designing thigh lift surgery. Classically, anthropometry binds the calf circumference with mid-thigh circumference and upper thigh (gluteal) circumference to make postoperative results more harmonious and natural. Method: To find out the anthropometrically referenced ratio of the calf circumference with mid-thigh circumference and upper thigh (gluteal) circumference, anthropometric databases and studies done on females addressing different ages, countries and races with average BMI (body mass index) were reviewed. Chosen studies should include the calf circumference, mid-thigh circumference and/or upper thigh (gluteal) circumference. Anthropometrically referenced upper and mid-thigh circumferences can be calculated preoperatively. Result: 64:92:100 was concluded as a pooled mean ratio out of nine different studies addressing the ratio of the calf circumference:mid-thigh circumference:upper thigh (gluteal) circumference. Conclusion: Postoperative anthropometrically referenced mid and upper thigh circumferences can be calculated by measuring the calf circumference and applying the 64:92:100 ratio. Markings are done intraoperatively using my innovated “Stab-Push-Pinch-Mark” or SPPM technique for drawing a rough surgical design, then tweaked using the anthropometrically referenced 64:92:100 ratio results.
文摘Deformities in the body contouring population are rarely isolated to one area,and procedures can be combined to achieve more substantial results.While there is no formula for optimal surgical sequencing and timing,there are certain principles which-when applied appropriately-can yield results that are reliable,aesthetically pleasing,and aligned with the patient’s desires and preferences.In this article,we outline our latest thinking in circumferential body contouring and how to integrate the lower body lift with procedures of the abdomen,upper body,breasts,back,and arms to achieve the complete 360°look.
