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Ta MD, Kim Y, Shin H, Truong VG, Kang HW. Quantitative investigations on light emission profiles for interstitial laser treatment. BIOMEDICAL OPTICS EXPRESS 2024; 15:6877-6892. [PMID: 39679393 PMCID: PMC11640558 DOI: 10.1364/boe.540470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2024] [Revised: 10/19/2024] [Accepted: 11/05/2024] [Indexed: 12/17/2024]
Abstract
Interstitial laser treatment (ILT) using a diffusing applicator (DA) has been employed to treat tumors. However, the treatment efficacy and safety of the emission profiles from DAs have been poorly explored. This study investigated the effect of the emission profiles from DAs on prostate tumor treatment. Dual-peak and proximal-/distal-end peak profiles using 980 nm laser at 5 W for 60 s were tested to compare the extent of thermal coagulation in soft tissue numerically and experimentally. The numerical simulation predicted the temperature development in the tissue. Ex vivo porcine liver and in vivo rat models were used to compare the performance of the profiles. The dual-peak profile yielded a coagulation extent that was almost equivalent to that of the flat-top profile (in simulation) and 1.3 times larger than those of the other profiles in both ex vivo and in vivo. The dual-peak profile predictably entailed uniform coagulation within the irradiated region. Further in vivo studies using different tumor sizes will be evaluated to warrant the efficacy and safety of the dual-peak profile for the ILT of prostate tumors.
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Affiliation(s)
- Minh Duc Ta
- Industry 4.0 Convergence Bionics Engineering and Marine-integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
| | - Yeongeun Kim
- Industry 4.0 Convergence Bionics Engineering and Marine-integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
| | - Hwarang Shin
- Industry 4.0 Convergence Bionics Engineering and Marine-integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
| | | | - Hyun Wook Kang
- Industry 4.0 Convergence Bionics Engineering and Marine-integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
- TeCure, Inc., Busan, Republic of Korea
- Division of Smart Healthcare, College of Information Technology and Convergence, Pukyong National University, Busan, Republic of Korea
- Marine-integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, Republic of Korea
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Truong VG, Kim H, Lee BI, Cha B, Jeong S, Oh SJ, Kang HW. Development of Novel Balloon-Integrated Optical Catheter for Endoscopic and Circumferential Laser Application. Ann Biomed Eng 2023; 51:2021-2034. [PMID: 37191825 DOI: 10.1007/s10439-023-03228-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 04/29/2023] [Indexed: 05/17/2023]
Abstract
The current study aims to demonstrate the feasibility of a novel balloon-integrated optical catheter (BIOC) to achieve endoscopic laser application for circumferential coagulation of a tubular tissue structure. Both optical and thermal numerical simulations were developed to predict the propagation of laser light and a spatio-temporal distribution of temperature in tissue. Ex vivo esophagus tissue was tested with 980 nm laser light at 30 W for 90 s for quantitative evaluations. In vivo porcine models were used to validate the performance of BIOC for circumferential and endoscopic laser coagulation of esophagus in terms of acute tissue responses post-irradiation. Optical simulations confirmed that a diffusing applicator was able to generate a circumferential light distribution in a tubular tissue structure. Both numerical and experimental results presented that the maximum temperature elevation occurred at 3-5 mm (muscle layer) below the mucosa surface after 90 s irradiation. In vivo tests confirmed the circumferential delivery of laser light to a deep muscle layer as well as no evidence of thermal damage to the esophageal mucosa. The proposed BIOC can be a feasible optical device to provide circumferential laser irradiation as well as endoscopic coagulation of tubular esophagus tissue for clinical applications.
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Affiliation(s)
- Van Gia Truong
- Industry 4.0 Convergence Bionics Engineering and Marine-Integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
- TeCure, Inc., Busan, Republic of Korea
| | - Hyejin Kim
- Industry 4.0 Convergence Bionics Engineering and Marine-Integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
- TeCure, Inc., Busan, Republic of Korea
| | - Byeong-Il Lee
- Division of Smart Healthcare, College of Information Technology and Convergence, Pukyong National University, Busan, Republic of Korea
| | - Boram Cha
- Department of Internal Medicine, Inha University School of Medicine, Inha University Hospital, Incheon, Republic of Korea
| | - Seok Jeong
- Department of Internal Medicine, Inha University School of Medicine, Inha University Hospital, Incheon, Republic of Korea
| | - Sun-Ju Oh
- Department of Pathology, Kosin University College of Medicine, Busan, Republic of Korea
| | - Hyun Wook Kang
- Industry 4.0 Convergence Bionics Engineering and Marine-Integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea.
- TeCure, Inc., Busan, Republic of Korea.
- Division of Smart Healthcare, College of Information Technology and Convergence, Pukyong National University, Busan, Republic of Korea.
- Marine-Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, Republic of Korea.
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Endoscopic Ultrasound-Guided Pancreatic Interstitial Laser Ablation Using a Cylindrical Laser Diffuser: A Long-Term Follow-Up Study. Biomedicines 2022; 10:biomedicines10112895. [PMID: 36428465 PMCID: PMC9687491 DOI: 10.3390/biomedicines10112895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/02/2022] [Accepted: 11/09/2022] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND AND AIMS Local ablative treatment is another option for improving outcomes and has been evaluated for locally advanced pancreatic cancer. We previously suggested endoscopic ultrasound (EUS)-guided interstitial laser ablation using a cylindrical laser diffuser (CILA) might be a feasible therapeutic option based on experiments performed on pancreatic cancer cell lines and porcine model with a short follow-up (3 days). The aim of this study was to investigate the safety of EUS-CILA performed using optimal settings in porcine pancreas with a long-term follow-up (2 weeks). METHODS EUS-CILA (laser energy of 450 J; 5 W for 90 s) was applied to normal pancreatic tissue in porcine (n = 5) under EUS guidance. Animals were observed clinically for 2 weeks after EUS-CILA to evaluate complications. Computed tomography and laboratory tests were carried out to evaluate safety. Two weeks after EUS-CILA, all pigs were sacrificed, and histopathological safety and efficacy evaluations were conducted. RESULTS EUS-CILA was technically successful in all five cases. No major complications occurred during the follow-up period. Body weight of porcine did not change during the study period without any significant change in feed intake. Animals remained in excellent condition throughout the experimental period, and laboratory tests and computed tomography (CT) scans provided no evidence of a major complication. Histopathological evaluation showed complete ablation in the ablated area with clear delineation of surrounding normal pancreatic tissue. Mean ablated volume was 55.5 mm2 × 29.0 mm and mean ablated areas in the pancreatic sections of the five pigs were not significantly different (p = 0.368). CONCLUSIONS In conclusion, our experimental study suggests that EUS-CILA is safe and has the potential to be an effective local treatment modality. No major morbidity or mortality occurred during the study period. Further evaluations are warranted before clinical application.
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Lim S, Truong VG, Kang HW. Impact of residual air trap in balloon on laser treatment of tubular tissue. Lasers Surg Med 2022; 54:767-778. [PMID: 35181900 DOI: 10.1002/lsm.23527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 01/28/2022] [Accepted: 02/06/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVES Tubular tissue, such as the bile duct and esophagus, often suffers from stenosis due to chronic inflammation or excessive contraction of smooth muscle. Laser treatment using a balloon catheter has been used to treat tubular tissue stenosis by mechanically expanding the tissue and irradiating laser light circumferentially on the tissue lumen. As the balloon is inflated with saline, the residual air in a delivery channel is often accumulated in the inflated balloon. Thus, the air trap may cause physical discontinuities at air-saline interface, leading to unpredictable and nonuniform photothermal interactions. The aim of the current study was to evaluate the optical-thermal effects of the air trap in the balloon on laser treatment of the tubular tissue by means of numerical simulations and experimental validations. MATERIALS AND METHODS A balloon-assisted diffusing applicator (BDA) was developed to inflate a balloon and deliver uniform and circumferential laser light. Before the balloon inflation, various numbers of deflations (0, 1, 2, 3, and 4) were applied to estimate the average amount of the air removed from the balloon. Ex vivo experiments using porcine liver duct were conducted with two deflation conditions (D0: no deflation for air trap and D3: three deflations for no air trap). The balloon was horizontally situated during laser irradiation to maintain the air trap at the same position in the balloon by minimizing gravity effect. Upon balloon inflation, 532 nm laser light was delivered through the BDA to the tissue (irradiance = 4 W/cm2 ) at 10 W for 45 seconds to assess the optical-thermal effects of the air trap on the ductal tissue. RESULTS The size of the air trap was noticeably reduced with the number of deflations. The air trap volume in the balloon decreased to 0.5% of the total balloon volume after D3. Ex vivo results demonstrated that thicker coagulative necrosis (CN) for D0 near the air trap region in the tissue than bottom region that contact with saline, representing an asymmetric profile of CN in the tissue. D0 generated 17% thicker and nonuniform CN (overall CN thickness = 1.4 ± 0.7 mm), compared with D3 with no air trap (overall CN thickness = 1.2 ± 0.2 mm; p < 0.05). A threefold larger eccentricity (E) was found in D0 (49 ± 31%) than D3 (15 ± 13%; p < 0.001). CONCLUSION Both numerical simulations and experiments validated the effect of the air trap in a balloon on the distribution of CN in a tubular tissue during BDA-assisted laser treatment. Further in vivo studies will assess the current findings on the air trap for clinical translations of BDA-assisted laser treatment of tubular tissue stenosis.
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Affiliation(s)
- Seonghee Lim
- Department of Biomedical Engineering, Pukyong National University, Busan, Republic of Korea
| | - Van Gia Truong
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea.,Tecure, Inc., Busan, Republic of Korea
| | - Hyun Wook Kang
- Department of Biomedical Engineering, Pukyong National University, Busan, Republic of Korea.,Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea.,Tecure, Inc., Busan, Republic of Korea.,Marine-Integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
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Truong VG, Kim H, Park JS, Tran VN, Kang HW. Multiple cylindrical interstitial laser ablations (CILAs) of porcine pancreas in ex vivo and in vivo models. Int J Hyperthermia 2021; 38:1313-1321. [PMID: 34472992 DOI: 10.1080/02656736.2021.1972171] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND The therapeutic capacity of multiple cylindrical interstitial laser ablations (CILAs) of pancreatic tissue was evaluated with 1064 nm laser light in ex vivo and in vivo porcine pancreatic models. METHODS A diffusing applicator was sequentially employed to deliver 1064 nm laser light in a cylindrical distribution to ablate a large volume of pancreatic tissue. Ex vivo tissue was tested at various power levels (5, 7, and 10 W) under US imaging. An in vivo porcine model was used to evaluate the clinical feasibility of multiple CILAs on pancreatic tissue at 5 W via laparotomy (N = 3). RESULTS Multiple CILAs symmetrically ablated a range of ex vivo tissue volumes (2.4-6.0 cm3) at various power levels. Multiple CILAs warranted a therapeutic capacity of symmetrically ablating in vivo pancreatic tissue. Both ex vivo and in vivo pancreatic tissues after multiple CILAs at 5 W confirmed the absence of or minimal thermal injury to the peripheral tissue and carbonization. CONCLUSIONS The current findings suggest that the collective thermal effects from multiple CILAs can help widely ablate pancreatic tissue with minimal thermal injury. Further in vivo studies will investigate the safety of the proposed CILA treatment as well as acute/chronic responses of pancreatic tissue for clinical translations.
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Affiliation(s)
- Van Gia Truong
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea
| | - Hyeonsoo Kim
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea
| | - Jin-Seok Park
- Division of Gastroenterology, Department of Internal Medicine, Inha University School of Medicine, Inha University Hospital, Incheon, Republic of Korea
| | - Van Nam Tran
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea
| | - Hyun Wook Kang
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea.,Department of Biomedical Engineering and Marine-Integrated Biomedical Technology Center, Pukyong National University, Busan, Republic of Korea
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Truong VG, Jeong S, Park JS, Tran VN, Kim SM, Lee DH, Kang HW. Endoscopic ultrasound (EUS)-guided cylindrical interstitial laser ablation (CILA) on in vivo porcine pancreas. BIOMEDICAL OPTICS EXPRESS 2021; 12:4423-4437. [PMID: 34457423 PMCID: PMC8367258 DOI: 10.1364/boe.427379] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/05/2021] [Accepted: 06/08/2021] [Indexed: 05/27/2023]
Abstract
This study aims to demonstrate the feasibility of cylindrical interstitial laser ablation (CILA) in porcine pancreatic tissue to develop a EUS-guided PC ablation technique with enhanced safety. A diffusing applicator created a uniformly symmetrical laser ablation in pancreatic tissue. Ex vivo tests presented that both ablation thickness and volume increased linearly with the applied power (R2 = 0.96 and 0.90, respectively) without carbonization and fiber degradation. The numerical simulations matched well with the experimental results in terms of temperature development and thermal damage (deviation of ≤ 15%). In vivo tests with EUS confirmed easy insertion and high durability of the diffusing applicator. EUS-guided CILA warranted a feasible therapeutic capacity of ablating in vivo pancreatic tissue. The proposed EUS-guided CILA can be a feasible therapeutic approach to treat PC with predictable thermal ablation and enhanced safety.
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Affiliation(s)
- Van Gia Truong
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea
- These authors contributed equally to this work
| | - Seok Jeong
- Department of Internal Medicine, Inha University School of Medicine, and the National Center of Efficacy Evaluation for the Development of Health Products Targeting Digestive Disorders, Inha University Hospital, Incheon, Republic of Korea
- These authors contributed equally to this work
| | - Jin-Seok Park
- Department of Internal Medicine, Inha University School of Medicine, and the National Center of Efficacy Evaluation for the Development of Health Products Targeting Digestive Disorders, Inha University Hospital, Incheon, Republic of Korea
| | - Van Nam Tran
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea
| | - Sung Min Kim
- Bluecore Company, Inc., Busan, Republic of Korea
| | - Don Haeng Lee
- Department of Internal Medicine, Inha University School of Medicine, and the National Center of Efficacy Evaluation for the Development of Health Products Targeting Digestive Disorders, Inha University Hospital, Incheon, Republic of Korea
| | - Hyun Wook Kang
- Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan, Republic of Korea
- Department of Biomedical Engineering, Pukyong National University, Busan, Republic of Korea
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Dolganova IN, Shikunova IA, Zotov AK, Shchedrina MA, Reshetov IV, Zaytsev KI, Tuchin VV, Kurlov VN. Microfocusing sapphire capillary needle for laser surgery and therapy: Fabrication and characterization. JOURNAL OF BIOPHOTONICS 2020; 13:e202000164. [PMID: 32681714 DOI: 10.1002/jbio.202000164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/21/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
A sapphire shaped capillary needle designed for collimating and focusing of laser radiation was proposed and fabricated by the edge-defined film-fed growth technique. It features an as-grown surface quality, high transparency for visible and near-infrared radiation, high thermal and chemical resistance and the complex shape of the tip, which protects silica fibers. The needle's geometrical parameters can be adjusted for use in various situations, such as type of tissue, modality of therapy and treatment protocol. The focusing effect was demonstrated numerically and observed experimentally during coagulation of the ex vivo porcine liver samples. This needle in combination with 0.22NA optical fiber allows intensive and uniform coagulation of 150 mm3 volume interstitially and 30 mm3 superficially by laser exposure with 280 J without tissue carbonization and fiber damaging along with delicate treatment of small areas. The demonstrated results reveal the perspectives of the proposed sapphire microfocusing needle for laser surgery and therapy.
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Affiliation(s)
- Irina N Dolganova
- Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | - Irina A Shikunova
- Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
| | - Arsen K Zotov
- Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | - Marina A Shchedrina
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | - Igor V Reshetov
- Institute for Cluster Oncology, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Academy of Postgraduate Education FSCC FMBA, Moscow, Russia
| | - Kirill I Zaytsev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | - Valery V Tuchin
- Saratov State University, Saratov, Russia
- Institute of Precision Mechanics and Control of the Russian Academy of Sciences, Saratov, Russia
- Tomsk State University, Tomsk, Russia
| | - Vladimir N Kurlov
- Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
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Ströbl S, Domke M, Rühm A, Sroka R. Investigation of non-uniformly emitting optical fiber diffusers on the light distribution in tissue. BIOMEDICAL OPTICS EXPRESS 2020; 11:3601-3617. [PMID: 33014554 PMCID: PMC7510903 DOI: 10.1364/boe.394494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/20/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
The influence of inhomogeneities in the emission characteristics of optical fiber diffusers on the light distribution within biological tissue was evaluated by Monte Carlo (MC) simulations and by experiments on optical phantoms. Due to the strong scattering of light within biological tissue, inhomogeneities in the emission profile become blurred within a short light propagation distance, so that the light distribution within the tissue approaches that of a homogeneous diffuser. The degree of feature vanishing in the light distribution is mainly determined by the width of the inhomogeneities. It was shown that the influence of local inhomogeneities on top of a homogeneous light distribution fades away very effectively within 1 mm of tissue depth, which results in a light distribution very close to that for a homogeneously emitting diffuser. Emission profiles composed of multiple narrow peaks distributed over the full diffuser length with a peak-to-peak distance of less than 2 mm result in an almost homogeneous light distribution after approximately 1 mm of tissue depth. While this article is focused on the impact of diffuser inhomogeneities on the light distribution within the tissue, the importance of further investigations on the related thermal effects is also discussed.
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Affiliation(s)
- Stephan Ströbl
- Research Centre for Microtechnology, FH Vorarlberg, Dornbirn, Vorarlberg, Austria
- Laser Research Laboratory, LIFE Centre, LMU Munich, Bavaria, Germany
| | - Matthias Domke
- Research Centre for Microtechnology, FH Vorarlberg, Dornbirn, Vorarlberg, Austria
| | - Adrian Rühm
- Laser Research Laboratory, LIFE Centre, LMU Munich, Bavaria, Germany
- Department of Urology, University Hospital, LMU Munich, Bavaria, Germany
| | - Ronald Sroka
- Laser Research Laboratory, LIFE Centre, LMU Munich, Bavaria, Germany
- Department of Urology, University Hospital, LMU Munich, Bavaria, Germany
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Tozburun S. Superficial photothermal laser ablation of ex vivo sheep esophagus using a cone-shaped optical fiber tip. JOURNAL OF BIOPHOTONICS 2020; 13:e201960116. [PMID: 32134552 DOI: 10.1002/jbio.201960116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 02/28/2020] [Accepted: 02/29/2020] [Indexed: 06/10/2023]
Abstract
Superficial photothermal laser ablation (SPLA) may be useful as a therapeutic approach producing a depth of injury that is sufficient to eliminate mucosal lesion but not deep enough to induce thermal effects in deeper tissue layers. The purpose of this preliminary study is twofold: (a) to describe design steps of a fiber probe capable of delivering a tightly focused laser beam, including Monte-Carlo-based simulations, and (b) to complete the initial testing of the probe in a sheep esophagus model, ex vivo. The cone-shaped (tapered) fiber tip was obtained by chemical etching of the optical fiber. A 1505 nm diode laser providing power up to 500 mW was operated in continuous wave. The successful SPLA of the sheep mucosa layer was demonstrated for various speed-power combinations, including 300 mW laser power at a surface scanning rate of 0.5 mm/s and 450 mW laser power at a surface scanning rate of 2.0 mm/s. Upon further development, this probe may be useful for endoscopic photothermal laser ablation of the mucosa layer using relatively low laser power.
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Affiliation(s)
- Serhat Tozburun
- Izmir Biomedicine and Genome Center, Izmir, Turkey
- Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
- Department of Biophysics, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey
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Dolganova IN, Shikunova IA, Katyba GM, Zotov AK, Mukhina EE, Shchedrina MA, Tuchin VV, Zaytsev KI, Kurlov VN. Optimization of sapphire capillary needles for interstitial and percutaneous laser medicine. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-7. [PMID: 31849206 PMCID: PMC7006039 DOI: 10.1117/1.jbo.24.12.128001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 11/26/2019] [Indexed: 06/10/2023]
Abstract
Sapphire capillary needles fabricated by edge-defined film-fed growth (EFG) technique hold strong potential in laser thermotherapy and photodynamic therapy, thanks to the advanced physical properties of sapphire. These needles feature an as-grown optical quality, their length is tens of centimeters, and they contain internal capillary channels, with open or closed ends. They can serve as optically transparent bearing elements with optical fibers introduced into their capillary channels in order to deliver laser radiation to biological tissues for therapeutic and, in some cases, diagnostic purposes. A potential advantage of the EFG-grown sapphire needles is associated with an ability to form the tip of a needle with complex geometry, either as-grown or mechanically treated, aimed at controlling the output radiation pattern. In order to examine a potential of the radiation pattern shaping, we present a set of fabricated sapphire needles with different tips. We studied the radiation patterns formed at the output of these needles using a He-Ne laser as a light source, and used intralipid-based tissue phantoms to proof the concept experimentally and the Monte-Carlo modeling to proof it numerically. The observed results demonstrate a good agreement between the numerical and experimental data and reveal an ability to control within wide limits the direction of tissue exposure to light and the amount of exposed tissue by managing the sapphire needle tip geometry.
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Affiliation(s)
- Irina N. Dolganova
- Russian Academy of Sciences, Institute of Solid State Physics, Chernogolovka, Russia
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | - Irina A. Shikunova
- Russian Academy of Sciences, Institute of Solid State Physics, Chernogolovka, Russia
| | - Gleb M. Katyba
- Russian Academy of Sciences, Institute of Solid State Physics, Chernogolovka, Russia
- Bauman Moscow State Technical University, Moscow, Russia
| | - Arsen K. Zotov
- Russian Academy of Sciences, Institute of Solid State Physics, Chernogolovka, Russia
| | | | - Marina A. Shchedrina
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
| | - Valery V. Tuchin
- Saratov State University, Saratov, Russia
- Russian Academy of Sciences, Institute of Precision Mechanics and Control, Saratov, Russia
- Tomsk State University, Tomsk, Russia
- ITMO University, St. Petersburg, Russia
| | - Kirill I. Zaytsev
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- Bauman Moscow State Technical University, Moscow, Russia
- Russian Academy of Sciences, Prokhorov General Physics Institute, Moscow, Russia
| | - Vladimir N. Kurlov
- Russian Academy of Sciences, Institute of Solid State Physics, Chernogolovka, Russia
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
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Shabahang S, Forward S, Yun SH. Polyethersulfone optical fibers with thermally induced microbubbles for custom side-scattering profiles. OPTICS EXPRESS 2019; 27:7560-7567. [PMID: 30876318 PMCID: PMC6825622 DOI: 10.1364/oe.27.007560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/04/2019] [Accepted: 02/08/2019] [Indexed: 05/24/2023]
Abstract
Polyethersulfone (PES) optical fibers are drawn and thermally processed in order to generate variable side-illumination profiles. The thermal treatment allows microbubbles to be formed in an outer layer of the PES fiber, providing light scattering with controllable amplitudes (0.25-2.5 cm-1). Several fibers with different scattering profiles, such as uniform axial irradiation and multiple irradiation spots, are demonstrated. A small microbubble-induced scattering spot on the surface may be used for side-coupling of ambient light into the fiber. These mechanically flexible all-PES fibers with custom-designable scattering profiles may be useful for spatially tuned delivery of light for various applications, including phototherapy.
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Affiliation(s)
- Soroush Shabahang
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, 50 Blossom Street, Boston, Massachusetts, USA, 02114
| | - Sarah Forward
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, 50 Blossom Street, Boston, Massachusetts, USA, 02114
| | - Seok-Hyun Yun
- Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, 50 Blossom Street, Boston, Massachusetts, USA, 02114
- Harvard-MIT Health Sciences and Technology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts, USA, 02139
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