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Rump A, Tetyczka C, Littringer E, Kromrey ML, Bülow R, Roblegg E, Weitschies W, Grimm M. In Vitro and In Vivo Evaluation of Carbopol 71G NF-Based Mucoadhesive Minitablets as a Gastroretentive Dosage Form. Mol Pharm 2023; 20:1624-1630. [PMID: 36705398 DOI: 10.1021/acs.molpharmaceut.2c00835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Gastroretentive dosage forms are intended to stay inside the stomach for a long period of time while releasing an active pharmaceutical ingredient. Such systems may offer significant benefits for numerous drugs compared to other sustained release systems, such as improved pharmacokinetics/bioavailability and reduced intake frequency and thereby improved adherence to the medical therapy. However, there is no gastroretentive product on the market with proven reliable gastroretentive properties in humans. A major obstacle is the motility pattern of the stomach in the fasting state in humans, which reliably ensures gastric emptying of even large indigestible objects into the small intestine. One promising approach to avoid gastric emptying is adhesion of the drug delivery system to the gastric mucosa. In order to achieve mucoadhesive properties, minitablets containing Carbopol 71G NF were developed and compared to minitablets without adhesive properties. In a specialized mucoadhesive test system, the adhesion time was prolonged for adhesive minitablets (240 min) compared to non-adhesive minitablets (30 min). The in vivo transit behavior was investigated using magnetic resonance imaging in 11 healthy volunteers in fasted state in a crossover setup. It was found that the gastric residence time (GRT) of the adhesive minitablets (median of 37.5 min with IQR = 22.5-52.5) was statistically significantly prolonged compared to the non-adhesive minitablets (median of 7.5 with IQR = 7.5-22.5), indicating a delay in gastric emptying by adhesion to the gastric mucosa. However, the system needs further improvement to create a clinical benefit. Furthermore, it was observed that for 9 of 22 administrations (three minitablets were given simultaneously with every administration), the minitablets were not emptied together but showed different GRTs.
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Affiliation(s)
- Adrian Rump
- Institute of Pharmacy, Biopharmaceutics and Pharmaceutical Technology, University of Greifswald, 17489 Greifswald, Germany
| | - Carolin Tetyczka
- Institute of Pharmaceutical Sciences, Pharmaceutical Technology and Biopharmacy, University of Graz, 8010 Graz, Austria
| | | | - Marie-Luise Kromrey
- Institute of Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, 17475 Greifswald, Germany
| | - Robin Bülow
- Institute of Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, 17475 Greifswald, Germany
| | - Eva Roblegg
- Institute of Pharmaceutical Sciences, Pharmaceutical Technology and Biopharmacy, University of Graz, 8010 Graz, Austria
| | - Werner Weitschies
- Institute of Pharmacy, Biopharmaceutics and Pharmaceutical Technology, University of Greifswald, 17489 Greifswald, Germany
| | - Michael Grimm
- Institute of Pharmacy, Biopharmaceutics and Pharmaceutical Technology, University of Greifswald, 17489 Greifswald, Germany
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2
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Lu W, Yu L, Wang L, Liu S, Li M, Wu Z, Chen S, Hu R, Hao H. Metformin Hydrochloride Mucosal Nanoparticles-Based Enteric Capsule for Prolonged Intestinal Residence Time, Improved Bioavailability, and Hypoglycemic Effect. AAPS PharmSciTech 2022; 24:31. [PMID: 36577873 DOI: 10.1208/s12249-022-02402-w] [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: 05/06/2022] [Accepted: 08/22/2022] [Indexed: 12/29/2022] Open
Abstract
Metformin hydrochloride enteric-coated capsule (MH-EC) is a commonly used clinical drug for the treatment of type 2 diabetes. In this study, we described a metformin hydrochloride mucosal nanoparticles enteric-coated capsule (MH-MNPs-EC) based on metformin hydrochloride chitosan mucosal nanoparticles (MH-CS MNPs) and its preparation method to improve the bioavailability and hypoglycemic effect duration of MH-EC. In intestinal adhesion study, the residue rates of free drugs and mucosal nanoparticles were 10.52% and 67.27%, respectively after cleaned with PBS buffer. MH-CS MNPs could significantly improve the efficacy of MH and promote the rehabilitation of diabetes rats. In vitro release test of MH-MNPs-EC showed continuous release over 12 h, while commercial MH-EC released completely within about 1 h in intestinal environment (pH 6.8). Pharmacokinetic study was performed in beagle dogs compared to the commercial MH-EC. The durations of blood MH concentration above 2 μg/mL were 9 h for MH-MNPs-EC versus 2 h for commercial MH-EC. The relative bioavailability of MH-MNPs-EC was determined as 185.28%, compared with commercial MH-EC. In conclusion, MH-CS MNPs have good intestinal adhesion and can significantly prolong the residence time of MH in the intestine. MH-MNPs-EC has better treatment effect compared with MH-EC, and it is expected to be a potential drug product for the treatment of diabetes because of its desired characteristics.
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Affiliation(s)
- Wenjie Lu
- School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, Jiangsu, China
| | - Lingfei Yu
- Anhui Province Key Laboratory of Pharmaceutical Technology and Application; Key Laboratory of Xin'an Medicine Ministry of Education, Anhui Province Key Laboratory of Chinese Medicinal Formula, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China
| | - Lujun Wang
- Anhui Province Key Laboratory of Pharmaceutical Technology and Application; Key Laboratory of Xin'an Medicine Ministry of Education, Anhui Province Key Laboratory of Chinese Medicinal Formula, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China
| | - Songlin Liu
- Anhui Huangshan Capsule Co. Ltd., Huangshan, 242700, Anhui, China
| | - Manman Li
- Anhui Province Key Laboratory of Pharmaceutical Technology and Application; Key Laboratory of Xin'an Medicine Ministry of Education, Anhui Province Key Laboratory of Chinese Medicinal Formula, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China
| | - Zijun Wu
- Anhui Province Key Laboratory of Pharmaceutical Technology and Application; Key Laboratory of Xin'an Medicine Ministry of Education, Anhui Province Key Laboratory of Chinese Medicinal Formula, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China
| | - Shengqi Chen
- Anhui Province Key Laboratory of Pharmaceutical Technology and Application; Key Laboratory of Xin'an Medicine Ministry of Education, Anhui Province Key Laboratory of Chinese Medicinal Formula, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China.
| | - Rongfeng Hu
- Anhui Province Key Laboratory of Pharmaceutical Technology and Application; Key Laboratory of Xin'an Medicine Ministry of Education, Anhui Province Key Laboratory of Chinese Medicinal Formula, Anhui University of Chinese Medicine, Hefei, 230038, Anhui, China.
| | - Haiping Hao
- School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, Jiangsu, China.
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3
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Smart pills for gastrointestinal diagnostics and therapy. Adv Drug Deliv Rev 2021; 177:113931. [PMID: 34416311 DOI: 10.1016/j.addr.2021.113931] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 08/03/2021] [Accepted: 08/13/2021] [Indexed: 12/13/2022]
Abstract
Ingestible smart pills have the potential to be a powerful clinical tool in the diagnosis and treatment of gastrointestinal disease. Though examples of this technology, such as capsule endoscopy, have been successfully translated from the lab into clinically used products, there are still numerous challenges that need to be overcome. This review gives an overview of the research being done in the area of ingestible smart pills and reports on the technical challenges in this field.
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Tran PHL, Tran TTD. Mucoadhesive Formulation Designs for Oral Controlled Drug Release at the Colon. Curr Pharm Des 2021; 27:540-547. [PMID: 32940169 DOI: 10.2174/1381612826666200917143816] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 07/17/2020] [Indexed: 11/22/2022]
Abstract
Mucoadhesive formulations have been demonstrated to result in efficient drug delivery systems with advantages over existing systems such as increased local retention and sustained drug release via adhesiveness to mucosal tissues. The controlled release of colon-targeted, orally administered drugs has recently attracted a number of studies investigating mucoadhesive systems. Consequently, substantial designs, from mucoadhesive cores to shells of particles, have been studied with promising applications. This review will provide an overview of specific strategies for developing mucoadhesive systems for colon-targeted oral delivery with controlled drug release, including mucoadhesive matrices, cross-linked mucoadhesive microparticles, coatings and mucoadhesive nanoparticles. The understanding of the basic principle of these designs and advanced formulations throughout will lead to the development of products with efficient drug delivery at the colon for therapies for different diseases.
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Affiliation(s)
- Phuong H L Tran
- Deakin University, School of Medicine, IMPACT, Institute for Innovation in Physical and Mental Health and Clinical Translation, Geelong, Australia
| | - Thao T D Tran
- Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam
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Beardslee LA, Banis GE, Chu S, Liu S, Chapin AA, Stine JM, Pasricha PJ, Ghodssi R. Ingestible Sensors and Sensing Systems for Minimally Invasive Diagnosis and Monitoring: The Next Frontier in Minimally Invasive Screening. ACS Sens 2020; 5:891-910. [PMID: 32157868 DOI: 10.1021/acssensors.9b02263] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Ingestible electronic systems that are capable of embedded sensing, particularly within the gastrointestinal (GI) tract and its accessory organs, have the potential to screen for diseases that are difficult if not impossible to detect at an early stage using other means. Furthermore, these devices have the potential to (1) reduce labor and facility costs for a variety of procedures, (2) promote research for discovering new biomarker targets for associated pathologies, (3) promote the development of autonomous or semiautonomous diagnostic aids for consumers, and (4) provide a foundation for epithelially targeted therapeutic interventions. These technological advances have the potential to make disease surveillance and treatment far more effective for a variety of conditions, allowing patients to lead longer and more productive lives. This review will examine the conventional techniques, as well as ingestible sensors and sensing systems that are currently under development for use in disease screening and diagnosis for GI disorders. Design considerations, fabrication, and applications will be discussed.
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Affiliation(s)
- Luke A. Beardslee
- Institute for Systems Research, University of Maryland, College Park, Maryland 20742, United States
| | - George E. Banis
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Sangwook Chu
- Institute for Systems Research, University of Maryland, College Park, Maryland 20742, United States
| | - Sanwei Liu
- Institute for Systems Research, University of Maryland, College Park, Maryland 20742, United States
| | - Ashley A. Chapin
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Justin M. Stine
- Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Pankaj Jay Pasricha
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, United States
| | - Reza Ghodssi
- Institute for Systems Research, University of Maryland, College Park, Maryland 20742, United States
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
- Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, United States
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Guo F, Ouyang T, Peng T, Zhang X, Xie B, Yang X, Liang D, Zhong H. Enhanced oral absorption of insulin using colon-specific nanoparticles co-modified with amphiphilic chitosan derivatives and cell-penetrating peptides. Biomater Sci 2019; 7:1493-1506. [PMID: 30672923 DOI: 10.1039/c8bm01485j] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this study, amphipathic chitosan derivative (ACS) and cell-penetrating peptide (CPP) co-modified colon-specific nanoparticles (CS-CPP NPs) were prepared and evaluated to improve the oral bioavailability of protein and peptide drugs. ACS modification was harnessed to protect CPPs from degradation in the stomach and small intestine after oral administration and achieve colon-specific drug delivery. After CS-CPP NPs reached the colon, ACSs on the surface of the NPs were gradually degraded and CPPs were exposed to bring into play the penetration efficacy in the colon epithelium. Herein, we synthesized four types of ACSs (TOCS, TDCS, TPCS and TSCS) and adopted three types of CPPs (Tat, Penetratin and R8) to prepare NPs (TOCS-Tat NPs, TDCS-Tat NPs, TPCS-Tat NPs, TSCS-Tat NPs, TDCS-Pen NPs and TDCS-R8 NPs). The study of the protective effects of ACS upon Tat showed that the modification of ACS exerted favourable protection upon Tat in the stomach and small intestine. ACS degradation in the colon was indirectly determined in the viscosity method, which indicated that ACS could be gradually degraded in the colon. Using Caco-2 cell monolayers as cell models, it was found that the cellular uptake amount and transcellular transportation performance of CS-CPP NPs were much enhanced compared with those of TDCS NPs and PVA NPs. With Bama mini-pigs as animal models, the pharmacodynamic study demonstrated that the hypoglycemic effect for insulin-loaded TDCS-Tat NPs was more significant than that for TDCS NPs, lowering the blood glucose by 40%. The pharmacokinetic study indicated that the AUC and Cmax for TDCS-Tat NPs were respectively increased by 1.45 times and 1.82 times compared with those of TDCS NPs. In conclusion, CS-CPP NPs as vehicles for colon-specific drug delivery systems may be an efficient approach to improve the oral absorption of protein and peptide drugs.
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Affiliation(s)
- Feng Guo
- School of Pharmacy, Nanchang University, 461 Bayi Road, Donghu District, Nanchang, 330006, China.
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7
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Jiang H, Yu W, Oscai M, Ziaie B. A Smart Capsule With a Hydrogel-Based pH-Triggered Release Switch for GI-Tract Site-Specific Drug Delivery. IEEE Trans Biomed Eng 2018; 65:2808-2813. [PMID: 29993401 DOI: 10.1109/tbme.2018.2818463] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this paper, we present a smart capsule that can release its payload after a predetermined/adjustable delay subsequent to passing from the stomach into the small intestine. The described capsule (9 mm × 22 mm) comprises a pH-sensitive hydrogel-based switch, an electronic compartment containing a capacitor charged to 2.7 V, and a drug reservoir capped by a taut fusible thread intertwined with a nichrome wire. The nichrome wire, capacitor, and pH-responsive electrical switch are connected in series. The pH transition the capsule encounters when it enters the small intestine triggers controlled swelling of the pH-responsive hydrogel, which pushes a conductive elastic membrane to close an electrical switch. This initiates a sequence of events, i.e., the discharge of the capacitor, heating the nichrome wire, breakage of the fusible thread, and release of the payload stored in the capsule reservoir through the unlatched cap. The time lag between initiation of hydrogel swelling (by the near-neutral pH of the small intestine) and payload release is controlled by the deflection of the conductive elastic membrane and the gap separating the contacts. The release time can be set to within ±5 min after one hour in the small intestine (start of the swelling) increasing to ±40 min after 4 h.
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8
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Mapara SS, Patravale VB. Medical capsule robots: A renaissance for diagnostics, drug delivery and surgical treatment. J Control Release 2017; 261:337-351. [PMID: 28694029 DOI: 10.1016/j.jconrel.2017.07.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 12/11/2022]
Abstract
The advancements in electronics and the progress in nanotechnology have resulted in path breaking development that will transform the way diagnosis and treatment are carried out currently. This development is Medical Capsule Robots, which has emerged from the science fiction idea of robots travelling inside the body to diagnose and cure disorders. The first marketed capsule robot was a capsule endoscope developed to capture images of the gastrointestinal tract. Today, varieties of capsule endoscopes are available in the market. They are slightly larger than regular oral capsules, made up of a biocompatible case and have electronic circuitry and mechanisms to capture and transmit images. In addition, robots with diagnostic features such as in vivo body temperature detection and pH monitoring have also been launched in the market. However, a multi-functional unit that will diagnose and cure diseases inside the body has not yet been realized. A remote controlled capsule that will undertake drug delivery and surgical treatment has not been successfully launched in the market. High cost, inadequate power supply, lack of control over drug release, limited space for drug storage on the capsule, inadequate safety and no mechanisms for active locomotion and anchoring have prevented their entry in the market. The capsule robots can revolutionize the current way of diagnosis and treatment. This paper discusses in detail the applications of medical capsule robots in diagnostics, drug delivery and surgical treatment. In diagnostics, detailed analysis has been presented on wireless capsule endoscopes, issues associated with the marketed versions and their corresponding solutions in literature. Moreover, an assessment has been made of the existing state of remote controlled capsules for targeted drug delivery and surgical treatment and their future impact is predicted. Besides the need for multi-functional capsule robots and the areas for further research have also been highlighted.
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Affiliation(s)
- Sanyat S Mapara
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga East, Mumbai 400019, India
| | - Vandana B Patravale
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga East, Mumbai 400019, India.
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9
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Mucoadhesive microparticles for local treatment of gastrointestinal diseases. Eur J Pharm Biopharm 2016; 105:156-65. [DOI: 10.1016/j.ejpb.2016.06.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 05/31/2016] [Accepted: 06/09/2016] [Indexed: 11/21/2022]
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10
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Yu W, Rahimi R, Ochoa M, Pinal R, Ziaie B. A Smart Capsule With GI-Tract-Location-Specific Payload Release. IEEE Trans Biomed Eng 2015; 62:2289-95. [DOI: 10.1109/tbme.2015.2418340] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Guo F, Zhang M, Gao Y, Zhu S, Chen S, Liu W, Zhong H, Liu J. Modified nanoparticles with cell-penetrating peptide and amphipathic chitosan derivative for enhanced oral colon absorption of insulin: preparation and evaluation. Drug Deliv 2015; 23:2003-14. [DOI: 10.3109/10717544.2015.1048489] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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12
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Engineering Micromechanical Systems for the Next Generation Wireless Capsule Endoscopy. BIOMED RESEARCH INTERNATIONAL 2015; 2015:741867. [PMID: 26258143 PMCID: PMC4518149 DOI: 10.1155/2015/741867] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 06/15/2015] [Accepted: 06/24/2015] [Indexed: 02/02/2023]
Abstract
Wireless capsule endoscopy (WCE) enables the detection and diagnosis of inflammatory bowel diseases such as Crohn's disease and ulcerative colitis. However treatment of these pathologies can only be achieved through conventional means. This paper describes the next generation WCE with increased functionality to enable targeted drug delivery in the small intestinal tract. A prototype microrobot fabricated in Nylon 6 is presented which is capable of resisting peristaltic pressure through the deployment of an integrated holding mechanism and delivering targeted therapy. The holding action is achieved by extending an “anchor” spanning a 60.4 mm circumference, for an 11.0 mm diameter WCE. This function is achieved by a mechanism that occupies only 347.0 mm3 volume, including mechanics and actuator. A micropositioning mechanism is described which utilises a single micromotor to radially position and then deploy a needle 1.5 mm outside the microrobot's body to deliver a 1 mL dose of medication to a targeted site. An analysis of the mechanics required to drive the holding mechanism is presented and an overview of microactuators and the state of the art in WCE is discussed. It is envisaged that this novel functionality will empower the next generation of WCE to help diagnose and treat pathologies of the GI tract.
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Munoz F, Alici G, Li W, Tan Z, Xiong K, Li Y, Ye Y, Luo ZP, He F, Gong Y. A review of drug delivery systems for capsule endoscopy. Adv Drug Deliv Rev 2014; 71:77-85. [PMID: 24384373 DOI: 10.1016/j.addr.2013.12.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 12/10/2013] [Accepted: 12/19/2013] [Indexed: 12/12/2022]
Abstract
The development of a highly controllable drug delivery system (DDS) for capsule endoscopy has become an important field of research due to its promising applications in therapeutic treatment of diseases in the gastrointestinal (GI) tract and drug absorption studies. Several factors need to be considered to establish the minimum requirements for a functional DDS. Environmental factors of the GI tract and also pharmaceutical factors can help determine the requirements to be met by a DDS in an endoscopic capsule. In order to minimize the influence of such factors on the performance of an effective DDS, at least two mechanisms should be incorporated into a capsule endoscope: an anchoring mechanism to control the capsule position and a drug release mechanism to control variables such as the drug release rate, number of doses and amount of drug released. The implementation of such remotely actuated mechanisms is challenging due to several constraints, including the limited space available in a swallowable capsule endoscope and the delicate and complex environment within the GI tract. This paper presents a comprehensive overview of existing DDS. A comparison of such DDS for capsule endoscopy based on the minimum DDS requirements is presented and future work is also discussed.
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Affiliation(s)
| | | | | | - Zifang Tan
- School of Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Ke Xiong
- Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Yan Li
- School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instruments, Sun Yat-sen University, Guangzhou 510006, China
| | - Yun Ye
- School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instruments, Sun Yat-sen University, Guangzhou 510006, China
| | - Zong-Ping Luo
- Orthopaedic Institute, Soochow University, Suzhou 215006, China; Department of Orthopaedics, First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Fan He
- School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; Orthopaedic Institute, Soochow University, Suzhou 215006, China; Department of Orthopaedics, First Affiliated Hospital of Soochow University, Suzhou 215006, China.
| | - Yihong Gong
- School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instruments, Sun Yat-sen University, Guangzhou 510006, China.
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Quaglia C, Tognarelli S, Sinibaldi E, Funaro N, Dario P, Menciassi A. Wireless Robotic Capsule for Releasing Bioadhesive Patches in the Gastrointestinal Tract. J Med Device 2013. [DOI: 10.1115/1.4025450] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A novel, miniature wireless robotic capsule for releasing bioadhesive patches in the gastrointestinal (GI) tract was designed, fabricated, and preliminarily tested. In particular, the assembled prototype was successfully navigated in a GI phantom, up to a target site where the release mechanism was verified. Then, deployment of a bioadhesive patch onto ex vivo porcine tissue was accomplished, and patch adhesion strength was verified. The main application of the present system is the deployment of anchoring patches for miniature robotic modules to be operated in the targeted anatomical domain. Such an innovative application stems from the wise blend of robotics and bioadhesion. Obtained results, which are consistent with previous investigations by the group, confirm the viability of the adopted bioadhesives for the envisaged anchoring tasks. The present feasibility study complies with the spirit of minimally invasive, wireless diagnosis, and therapy, and provides a preliminary contribution for their advancement.
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Affiliation(s)
| | | | - Edoardo Sinibaldi
- Istituto Italiano di Tecnologia, Center for Micro-BioRobotics@SSSA, Pontedera, Italy e-mail:
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15
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Zhu Z, Zhai Y, Zhang N, Leng D, Ding P. The development of polycarbophil as a bioadhesive material in pharmacy. Asian J Pharm Sci 2013. [DOI: 10.1016/j.ajps.2013.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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16
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Jang SF, Goins BA, Phillips WT, Santoyo C, Rice-Ficht A, McConville JT. Size discrimination in rat and mouse gastric emptying. Biopharm Drug Dispos 2013; 34:107-24. [PMID: 23143681 DOI: 10.1002/bdd.1828] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2012] [Revised: 09/23/2012] [Accepted: 11/03/2012] [Indexed: 11/10/2022]
Abstract
OBJECTIVES To investigate the relationship between particle size and gastric emptying in rodents using radiolabeled insoluble polymethyl methacrylate (PMMA) microcapsules/beads. METHODS PMMA microcapsules (50-500 µm) and beads (0.5-3 mm) loaded with technetium-99 m diethylenetriamine pentaacetic acid ((99m) Tc-DTPA) were administered to ICR mice or Sprague Dawley (SD) rats by oral gavage. Gamma scintiscans were acquired initially following administration and then at hourly intervals to 4 hours. RESULTS Scintiscans revealed that the smallest PMMA microcapsules (50-100 µm) or beads (0.5-1 mm) were impeded in the stomach and emptied slower than large particles in both rodent species. In mice, no significant difference in gastric emptying was found with microcapsules between 100 and 300 µm in diameter (p = 0.25) and particles more than 300 µm could not be administered. In rats, capsules containing 0.5-3 mm beads were stuck to the esophagus (up to 1 hour), this was a limitation of dosing beads of this size because they cannot be suspended in a liquid media for oral gavage purposes. Beads with diameters of 2-3 mm stayed in the stomach for up to 4 hours. CONCLUSIONS The cut-off emptying size in ICR mice could not be determined, due to the limitation of current available dosing methods. The cut-off emptying size in SD rats was between 1.5 and 2 mm. Therefore, particles with a diameter greater than 2 mm should not be used for gastric emptying studies of intact particles in SD rats, as their emptying is retarded in the stomach.
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Affiliation(s)
- Shih-Fan Jang
- College of Pharmacy, University of Texas at Austin, Austin, TX 78712, USA
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17
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O'Connor-Semmes RL, Sandefer EP, Hussey EK, Tao W, Doll WJ, Page RC, Dobbins R. Regional gastrointestinal delivery of remogliflozin etabonate in humans. Biopharm Drug Dispos 2013; 34:79-86. [DOI: 10.1002/bdd.1824] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 10/18/2012] [Accepted: 10/23/2012] [Indexed: 11/12/2022]
Affiliation(s)
| | | | | | - Wenli Tao
- GlaxoSmithKline, Inc; 5 Moore Drive; Research Triangle Park; NC; 27709; USA
| | - Walter J. Doll
- Scintipharma, Inc.; 2201 Regency Road Lexington; KY; 40503; USA
| | - Richard C. Page
- Scintipharma, Inc.; 2201 Regency Road Lexington; KY; 40503; USA
| | - Robert Dobbins
- GlaxoSmithKline, Inc; 5 Moore Drive; Research Triangle Park; NC; 27709; USA
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Yim S, Goyal K, Sitti M. Magnetically Actuated Soft Capsule With the Multimodal Drug Release Function. IEEE/ASME TRANSACTIONS ON MECHATRONICS : A JOINT PUBLICATION OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY AND THE ASME DYNAMIC SYSTEMS AND CONTROL DIVISION 2013; 18:1413-1418. [PMID: 25378896 PMCID: PMC4219580 DOI: 10.1109/tmech.2012.2235077] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In this paper, we present a magnetically actuated multimodal drug release mechanism using a tetherless soft capsule endoscope for the treatment of gastric disease. Because the designed capsule has a drug chamber between both magnetic heads, if it is compressed by the external magnetic field, the capsule could release a drug in a specific position locally. The capsule is designed to release a drug in two modes according to the situation. In the first mode, a small amount of drug is continuously released by a series of pulse type magnetic field (0.01-0.03 T). The experimental results show that the drug release can be controlled by the frequency of the external magnetic pulse. In the second mode, about 800 mm3 of drug is released by the external magnetic field of 0.07 T, which induces a stronger magnetic attraction than the critical force for capsule's collapsing. As a result, a polymeric coating is formed around the capsule. The coated area is dependent on the drug viscosity. This paper presents simulations and various experiments to evaluate the magnetically actuated multimodal drug release capability. The proposed soft capsules could be used as minimally invasive tetherless medical devices with therapeutic capability for the next generation capsule endoscopy.
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Varum FJ, Veiga F, Sousa JS, Basit AW. Mucoadhesive platforms for targeted delivery to the colon. Int J Pharm 2011; 420:11-9. [DOI: 10.1016/j.ijpharm.2011.08.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 08/03/2011] [Accepted: 08/04/2011] [Indexed: 10/17/2022]
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Long M, Rogers SH, Thornthwaite DW, Livens FR, Rannard SP. Monitoring Atom Transfer Radical Polymerisation using14C-radiolabelled initiators. Polym Chem 2011. [DOI: 10.1039/c0py00275e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Varum FJ, Veiga F, Sousa JS, Basit AW. An investigation into the role of mucus thickness on mucoadhesion in the gastrointestinal tract of pig. Eur J Pharm Sci 2010; 40:335-41. [DOI: 10.1016/j.ejps.2010.04.007] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Revised: 04/13/2010] [Accepted: 04/14/2010] [Indexed: 12/16/2022]
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Xitian P, Hongying L, Kang W, Yulin L, Xiaolin Z, Zhiyu W. A novel remote controlled capsule for site-specific drug delivery in human GI tract. Int J Pharm 2009; 382:160-4. [PMID: 19716870 DOI: 10.1016/j.ijpharm.2009.08.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2009] [Revised: 08/03/2009] [Accepted: 08/23/2009] [Indexed: 02/03/2023]
Abstract
Remote controlled capsule (RCC) has been extensively used in the field of site-specific drug delivery. It is a potent tool to study the regional drug absorption of the gastrointestinal (GI) tract that provides pharmaceutical scientists with significant pharmacokinetics data for oral drug formulation development. In present investigations, a patented novel RCC has been devised based on micro-electronic mechanical system (MEMS) technology. Micro-thrusters were for the first time exploited as drug release actuators of RCCs. As the micro-thruster is ignited by a radio frequency (RF) signal, the thrust force generated by the propellants pushes the piston forward and leads to a rapid and complete expulsion of therapeutic agents from the capsule. The micro-thruster merely consumes 120 mW for ignition and the duration time of drug release is decreased to less than 1 s. The feasibility of the novel RCC was evaluated through animal experiments in beagles using aminophylline as the model drug. The novel RCC developed is a promising alternative for site-specific drug delivery in human GI tract.
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Affiliation(s)
- Pi Xitian
- Laboratory of Pharmaceutical and Controlled Release Technology, College of Bioengineering of Chongqing University, Chongqing 400044, PR China.
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Long M, Thornthwaite DW, Rogers SH, Bonzi G, Livens FR, Rannard SP. Utilising 14C-radiolabelled atom transfer radical polymerisation initiators. Chem Commun (Camb) 2009:6406-8. [DOI: 10.1039/b913294e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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