肌腱韧带拉伸力学刺激生理模拟三维体外组织工程构建生物反应器 The DynaGen® Series bioreactors provide mechanical stimulation to three dimensional tissue engineered constructs to create physiological conditions in-vitro. The LigaGen system imparts axial stress or strain to a ligament or tendon construct. The stress/strain profiles can be defined by the user and can be a simple harmonic (sinusoidal) or a physiological waveform. Applications include the investigation of cell function and differentiation, pharmaceutical benchtop testing, and the seeding and growth of engineered tissues and medical devices. Researchers are currently utilizing these systems in a wide range of research areas including: • ACL regenerative medicine • Collagen gel stimulation • Small diameter tendon stimulation • Hand tendon and ligament regenerative medicine Chambers The LigaGen bioreactor chamber delivers oscillatory axial stimulation to samples with large aspect ratios. The chambers can be used with a variety of construct materials from decellularized tendons and ligaments to polymerized hydrogels. The chamber accommodates samples up to 30mm in length and 3mm thickness. A wide range of construct geometries can be stimulated using multiple grip styles. A flexible bellows seal facilitates the transfer of axial motion into the chamber while maintaining a sterile environment. Single sample and multisample chamber configurations are provided and they can be used with a perfusion system to provide convective media transport around the samples. Fabricated from bioinert materials, the autoclavable chambers also polycarbonate removable windows for easy viewing and laser micrometer measurement. Additional chamber features include: L30-1X: Single sample chamber with 23ml internal volume L30-4C The chamber accommodates either two (2) or four (4) samples and has an 80ml internal volume/td> Grip Options The types of constructs used in ligament and tendon experiments vary widely and range from decellularized allografts to polymerized hydrogels. In order to handle these varied specimen types, the several options for gripping mechanisms are offered including: Clamp Mechanical clamp vice grips with a collet locking mechanism. These grips are recommended for constructs which require a large clamping force. In Situ Polymerization These grips feature an integrated construct mold and porous grips to enable mechanical stimulation of hydrogel scaffolds. Suture A 316SS tab with suture holes drilled throughout accommodates wide constructs that will not fit within the clamp-type grips. Custom Grips Many constructs often require some level of grip customization. We have developed many grip designs and will adapt them to the your specific construct material and geometry. DynaGen® Stimulator: The LigaGen bioreactor system includes the TC (tension/compression) mechanical stimulator. Featuring a 40N linear motor, the stimulator is lightweight, compact and incubator compatible. The TC stimulator controls both load and displacement and can be used with any of the LigaGen bioreactor chambers. The stimulator dimensions are as follows: L30-1X Dimensions: 380mm(15")H X 127mm(5")W X 178mm(7")D Weight 2.9kg (6.5lb) L30-4C Dimensions: 330mm(13")H X 102mm(4")W X 102mm(4")D Weight 2.3kg (5.0lb) GrowthWorks® Software & Control: A fifth generation design, the GrowthWorks Software and Control platform includes advanced capabilities, such as multiple waveform control, data acquisition and multi-motor operation. The intuitive software runs on a Windows® laptop computer and features a simple user interface. User defined stimulation profiles are controlled by the software and are readily monitored using graphical displays. Integrated data acquisition routines capture and record data at user prescribed intervals. The GrowthWorks Software is configurable for running four stimulators while simultaneously monitoring up to 16 transducers, allowing the researcher maximum flexibility. The GrowthWorks Control Hardware features an embedded Intel CPU, integrated data acquisition and integrated motor drives. Communications between the laptop and control hardware is transmitted over a standard network cable. Primary advantages of the TGT Laptop/Controller approach are reduced physical size and easy upgradability. As future Windows versions or higher performance Laptops become available, either can be replaced without any software or controller changes. This ensures the GrowthWorks control system will be an integral part of your research for many years to come. GrowthApps Stiffness Measurement & Adaptive Control: The GrowthApps modules provided added capability to GrowthWorks. The addition of the Stiffness Measurement & Adaptive Control Application enables the system to make real-time measurements of the sample stiffness during culture. Described inU.S. Patent 7,410,792 B2 Instrumented bioreactor with material property measurement capability and process-based adjustment for conditioning tissue engineered medical products., the Application measures the mechanical response of the tissue construct as it is being stimulated and conditioned. The stiffness measurements can be used as guidelines for bench marking progress during culturing or for modifying the stimulation profile. Based upon the measured response, the bioreactor system is then capable of altering the stimulation profile. This technology enables researchers to automatically culture the tendon or ligament from initial seeding to an implantation-ready state with minimal operator intervention. LIGAMENT Key: S=Standard, A=Available, - = not available CHAMBERS L30-1 L30-4c Individual ligament growth chamber S S 6 parallel growth chambers, with up to 4 ligament constructs per chamber - A Interface for tension grips S S Perfusion and instrumentation ports per chamber 4 4 Bellows and seal to protect construct from outer environment S S In-situ hydrogel seeding configuration: wire grips and casting mold A A Patent pending grip lock during sample handling S S Mechanical clamp grips A A Inflatable clamp grips A A STIMULATION Axial stimulator and reaction frame S S CONTROLS Controller software, computer, and monitor S S Power supplies and cabling S S Automatic stimulation positioner - A Mean flow control A A Dynamic flow control A A TISSUE MONITORING Non-contact radial or axial distension measurement A A Non-contact flow sensors A A Catheter pressure transducers A A ACCESSORIES Media reservoir S S Stimulator positioner (automatic) - A Stimulator positioner (manual) - A Incubator A A BENEFITS All-autoclavable components S S Excellent sample visibility S S Medium change without opening chamber via luer injection port fittings S S Increased sterility with fast and clean sample change and access S S Lightweight design for easy handling S S Easily cleaned surface finishes S S Transparent opposing reactor walls for optical inspection or measurement S S Compact design to fit in standard incubators S S 100% satisfaction guaranteed warranty S S Click here to download a LigaGen Brochure (Adobe PDF 120kb)