The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
Makoto Kikuchi - One of the best experts on this subject based on the ideXlab platform.
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high power continuous wave 3 and 2 spl mu m cascade ho sup 3 zblan Fiber laser and its Medical applications
IEEE Journal of Selected Topics in Quantum Electronics, 1999Co-Authors: Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto KikuchiAbstract:A new Medical Fiber laser oscillating at two useful wavelengths (3 and 2 /spl mu/m) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass Fiber laser pumped with a 1.15-/spl mu/m Fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 /spl mu/m, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF (ZBLAN) glass Fiber. In experiments to evaluate potential for Medical applications, we tested the two wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.
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High-power continuous-wave 3- and 2-/spl mu/m cascade Ho/sup 3+/:ZBLAN Fiber laser and its Medical applications
IEEE Journal of Selected Topics in Quantum Electronics, 1999Co-Authors: Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto KikuchiAbstract:A new Medical Fiber laser oscillating at two useful wavelengths (3 and 2 /spl mu/m) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass Fiber laser pumped with a 1.15-/spl mu/m Fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 /spl mu/m, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF (ZBLAN) glass Fiber. In experiments to evaluate potential for Medical applications, we tested the two wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.
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Infrared glass Fiber cables for CO laser Medical applications
Optical Fibers in Medicine VIII, 1993Co-Authors: Tsunenori Arai, Makoto Kikuchi, Kyoichi Mizuno, Koji Sensaki, Tamishige Watanabe, Atsushi Utsumi, Kiyoshi Takeuchi, Yoshiro AkaiAbstract:We developed the Medical Fiber cables which were designed for CO laser therapy, i.e., angioplasty and endoscopic therapy. As-S chalcogenide glass Fibers were used for CO laser delivery. A 230 micrometers core-diameter Fiber was used for the angioplasty laser cable. The outer diameter of this cable was 600 micrometers . The total length and insertion length of the angioplasty laser cable were 2.5 m and 1.0 m, respectively. Typically, 2.0 W of Fiber output was used in the animal experiment in vivo for the ablation of the model plaque which consisted of human atheromatous aorta wall. The transmission of the angioplasty laser cable was approximately 35%, because the reflection loss occurred at both ends of the Fiber and window. Meanwhile, the core diameter of the energy delivery Fiber for the endoscopic therapy was 450 micrometers . The outer diameter of this cable was 1.7 mm. Approximately 4.5 W of Fiber output was used for clinical treatment of pneumothorax through a pneumoscope. Both types of the cables had the ultra-thin thermocouples for temperature monitoring at the tip of the cables. This temperature monitoring was extremely useful to prevent the thermal destruction of the Fiber tip. Moreover, the As-S glass Fibers were completely sealed by the CaF2 windows and outer tubes. Therefore, these cables were considered to have sufficient safety properties for Medical applications. These laser cables were successfully used for the in vivo animal experiments and/or actual clinical therapies.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Nicole T. Abdo - One of the best experts on this subject based on the ideXlab platform.
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VIRTUAL BONE-IMPLANT SURFACE CONTACT PARADIGM TO DETERMINE THE EFFICACY OF POROUS-COATED IMPLANT ATTACHMENT IN TOTAL JOINT REPLACEMENT
Journal of Bone and Joint Surgery-british Volume, 2016Co-Authors: Ornusa Chalayon, Richard T. Epperson, Roy D Bloebaum, Nicole T. AbdoAbstract:Introduction Fixation has been shown to be the primary indicator of an implant9s long-term success. Failure to achieve attachment, especially in acetabular and TKR, has been attributed to a lack of initial stability and gaps between the implant and bone. Gaps greater than 150 microns allow fibrous tissue to form. Properly addressing implant design features can help avoid adverse outcomes. ASTM International Standards (F1854-09) do not assess the relationship between porosity of the coating and that of cancellous bone, which can lead to an absence of mechanical interlock. This study developed a virtual program that uses human cancellous bone to predict potential skeletal attachment for implants properly placed for TJR. The goal of the Virtual Paradigm was to assess initial contact surface area at the time of implantation. Methods Seven human femurs and tibias were used. Bones from 11 males and 3 females were used, ages ranging from 40 to 61. Five porous coatings were assessed: Biofoam (Wright Medical), Fiber Mesh, CSTI, Tantalum (Zimmer), and P² (DJO Global). Specimen Processing Each bone was resected 2 mm beyond the articulating surface into the cancellous host using surgical TKA instruments. The specimens and coatings were embedded in PMMA. For Part 1, the specimens and coatings were cut perpendicular to the neutral axis, displaying a surface view for scanning electron microscopy (SEM). For Part 2, the coatings were cross-sectioned for SEM, ground, and polished to optical finish. Imaging: Part 1 The bone and coating sections displaying the surface view were imaged using SEM under backscatter (BSE) at 22x. Three images were taken of each tibia section, resulting in 12 images. Three images were taken of each femur section, resulting in 9 images. Analysis: Part 1 Each bone image was overlaid onto each coating image. Using various computer programs (IQ Materials, Fastone Image Viewer, Corel Photopaint X3), available bone was normalized to 100% and bone-implant contact was marked red (Figure 1). Imaging: Part 2 The cross-sectioned coatings were imaged with SEM-BSE at 30x. For each implant, 3 images were taken and assembled together (Microsoft Research ICE). Analysis: Part 2 Using the programs, bone images were overlaid onto each coating to establish a 200-micron region of initial contact. The surface of the coating within this region was calculated to represent surface roughness (Figure 2). Results Bone porosity ranged from 14.04%-23.04% in the femur and 11.85%-23.68% in the tibia. Percent contact between the implant and bone ranged from 3.28%-43.47% (Figure 1). Surface roughness ranged from 5.4–11.1 mm (Figure 2). Opening porosity of the coatings ranged from 52.54%-94.97% (Figure 3). Discussion Long-term success of cementless TJR depends on mechanical stability and bone attachment. This virtual study addressed fixation and contact between coatings and cancellous bone, and it can be used to evaluate innovative materials intended for TJR. This program challenged the limits of ASTM Standards for screening coatings. The results of this study demonstrated that the Virtual Bone-Implant Surface Contact Paradigm could be used in the early phases of implant development and testing to assess clinical success.
Tetsumi Sumiyoshi - One of the best experts on this subject based on the ideXlab platform.
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high power continuous wave 3 and 2 spl mu m cascade ho sup 3 zblan Fiber laser and its Medical applications
IEEE Journal of Selected Topics in Quantum Electronics, 1999Co-Authors: Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto KikuchiAbstract:A new Medical Fiber laser oscillating at two useful wavelengths (3 and 2 /spl mu/m) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass Fiber laser pumped with a 1.15-/spl mu/m Fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 /spl mu/m, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF (ZBLAN) glass Fiber. In experiments to evaluate potential for Medical applications, we tested the two wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.
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High-power continuous-wave 3- and 2-/spl mu/m cascade Ho/sup 3+/:ZBLAN Fiber laser and its Medical applications
IEEE Journal of Selected Topics in Quantum Electronics, 1999Co-Authors: Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto KikuchiAbstract:A new Medical Fiber laser oscillating at two useful wavelengths (3 and 2 /spl mu/m) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass Fiber laser pumped with a 1.15-/spl mu/m Fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 /spl mu/m, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF (ZBLAN) glass Fiber. In experiments to evaluate potential for Medical applications, we tested the two wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.
Ornusa Chalayon - One of the best experts on this subject based on the ideXlab platform.
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VIRTUAL BONE-IMPLANT SURFACE CONTACT PARADIGM TO DETERMINE THE EFFICACY OF POROUS-COATED IMPLANT ATTACHMENT IN TOTAL JOINT REPLACEMENT
Journal of Bone and Joint Surgery-british Volume, 2016Co-Authors: Ornusa Chalayon, Richard T. Epperson, Roy D Bloebaum, Nicole T. AbdoAbstract:Introduction Fixation has been shown to be the primary indicator of an implant9s long-term success. Failure to achieve attachment, especially in acetabular and TKR, has been attributed to a lack of initial stability and gaps between the implant and bone. Gaps greater than 150 microns allow fibrous tissue to form. Properly addressing implant design features can help avoid adverse outcomes. ASTM International Standards (F1854-09) do not assess the relationship between porosity of the coating and that of cancellous bone, which can lead to an absence of mechanical interlock. This study developed a virtual program that uses human cancellous bone to predict potential skeletal attachment for implants properly placed for TJR. The goal of the Virtual Paradigm was to assess initial contact surface area at the time of implantation. Methods Seven human femurs and tibias were used. Bones from 11 males and 3 females were used, ages ranging from 40 to 61. Five porous coatings were assessed: Biofoam (Wright Medical), Fiber Mesh, CSTI, Tantalum (Zimmer), and P² (DJO Global). Specimen Processing Each bone was resected 2 mm beyond the articulating surface into the cancellous host using surgical TKA instruments. The specimens and coatings were embedded in PMMA. For Part 1, the specimens and coatings were cut perpendicular to the neutral axis, displaying a surface view for scanning electron microscopy (SEM). For Part 2, the coatings were cross-sectioned for SEM, ground, and polished to optical finish. Imaging: Part 1 The bone and coating sections displaying the surface view were imaged using SEM under backscatter (BSE) at 22x. Three images were taken of each tibia section, resulting in 12 images. Three images were taken of each femur section, resulting in 9 images. Analysis: Part 1 Each bone image was overlaid onto each coating image. Using various computer programs (IQ Materials, Fastone Image Viewer, Corel Photopaint X3), available bone was normalized to 100% and bone-implant contact was marked red (Figure 1). Imaging: Part 2 The cross-sectioned coatings were imaged with SEM-BSE at 30x. For each implant, 3 images were taken and assembled together (Microsoft Research ICE). Analysis: Part 2 Using the programs, bone images were overlaid onto each coating to establish a 200-micron region of initial contact. The surface of the coating within this region was calculated to represent surface roughness (Figure 2). Results Bone porosity ranged from 14.04%-23.04% in the femur and 11.85%-23.68% in the tibia. Percent contact between the implant and bone ranged from 3.28%-43.47% (Figure 1). Surface roughness ranged from 5.4–11.1 mm (Figure 2). Opening porosity of the coatings ranged from 52.54%-94.97% (Figure 3). Discussion Long-term success of cementless TJR depends on mechanical stability and bone attachment. This virtual study addressed fixation and contact between coatings and cancellous bone, and it can be used to evaluate innovative materials intended for TJR. This program challenged the limits of ASTM Standards for screening coatings. The results of this study demonstrated that the Virtual Bone-Implant Surface Contact Paradigm could be used in the early phases of implant development and testing to assess clinical success.
Shunichi Sato - One of the best experts on this subject based on the ideXlab platform.
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high power continuous wave 3 and 2 spl mu m cascade ho sup 3 zblan Fiber laser and its Medical applications
IEEE Journal of Selected Topics in Quantum Electronics, 1999Co-Authors: Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto KikuchiAbstract:A new Medical Fiber laser oscillating at two useful wavelengths (3 and 2 /spl mu/m) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass Fiber laser pumped with a 1.15-/spl mu/m Fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 /spl mu/m, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF (ZBLAN) glass Fiber. In experiments to evaluate potential for Medical applications, we tested the two wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.
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High-power continuous-wave 3- and 2-/spl mu/m cascade Ho/sup 3+/:ZBLAN Fiber laser and its Medical applications
IEEE Journal of Selected Topics in Quantum Electronics, 1999Co-Authors: Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto KikuchiAbstract:A new Medical Fiber laser oscillating at two useful wavelengths (3 and 2 /spl mu/m) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass Fiber laser pumped with a 1.15-/spl mu/m Fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 /spl mu/m, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF/sub 4/-BaF/sub 2/-LaF/sub 3/-AlF/sub 3/-NaF (ZBLAN) glass Fiber. In experiments to evaluate potential for Medical applications, we tested the two wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.