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3-dimensional bioscaffolds

A biological scaffold, 3D technology, applied in the field of implants for the treatment of injuries such as but not limited to meniscus injuries, can solve problems such as limited applications

Inactive Publication Date: 2016-07-27
NAT UNIV OF SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high temperatures are required to melt the polymer during the manufacturing process, thus limiting the application of temperature sensitive materials (i.e. collagen, growth factors, etc.) or materials with high melting points

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094]Embodiment 1: the influence of PCL solution concentration

[0095] Concentration refers herein to the weight-to-volume ratio of PCL in acetic acid, which is critical for the formation of filaments, and thus for the fabrication of bioscaffolds. In the traditional electrospinning process, the most commonly used PCL solution concentration is 8% to 12% (Seeram et al. 2005), while in the E-jet process, no filaments are produced at such low concentrations ( Figure 4 a). A broad line of solution appeared only on the substrate, which was attributed to insufficient time for the solvent to evaporate. Complete drying of the printed wires took more than 5 min, making it impossible to construct bioscaffold structures. Increasing the concentration of PCL solution up to 70% was investigated to study the effect of concentration on silk production and bioscaffold fabrication, and the results are shown here.

[0096] PCL filaments can be obtained using a 30% solution. Repeated printing...

Embodiment 2

[0100] Example 2: Characterization of Biological Scaffolds

[0101] Figure 5 SEM examination of E-jetted PCL filaments is shown in a. Parallel filaments were obtained, and the surface of the printed filaments was generally smooth. Under the action of high voltage, uniform filaments with a diameter of 20.5±1.9 μm were realized. This is much smaller than filaments produced using a microextrusion system with a filament diameter of 100 μm (Kalita et al. 2003, Wei et al. 2012). Filaments have been shown to enhance cell attachment and modulate cell signaling pathways, thereby accelerating extracellular matrix production (Nur-E-Kamal et al. 2005, Li et al. 2006).

[0102] According to literature reports, the pore size of electrospun bioscaffolds is small compared to the size of cells, thereby limiting the passage of cells into bioscaffolds (Kidoaki et al. 2005). To evaluate this, a 10-layer bioscaffold ( Figure 5 b). The obtained pore size was 450±50 μm. A large pore size wo...

Embodiment 3

[0105] Example 3: In Vitro Study of Chondrocyte Response on Biological Scaffolds

[0106] After 3 days of culture, the viability of chondrocytes on the fibrous bioscaffolds was assessed using a live / dead staining method. It was found that a large number of live chondrocytes (highlighted part in the figure) attached to and spread on the surface of collagen-coated PCL filaments, showing good cell viability ( Figure 7 a). In addition, chondrocytes adhered to the inner surface of the bioscaffold were seen, showing good cell infiltration. Some cells were well in focus in the plane, while others were not, implying that these cells were attached in different layers of the bioscaffold.

[0107] Figure 7 b shows sGAG production on cell-loaded bioscaffolds and controls. The amount of sGAG content on each sample increased with incubation time. However, sGAG produced by chondrocytes on bioscaffolds was significantly higher than that of controls at all time points. The results show...

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Abstract

The invention concerns an apparatus and a method for the manufacture of a three-dimensional (3D) bioscaffold; a 3D bioscaffold made using same; and the use of said 3D bioscaffold in the manufacture of an implant to treat injuries such as, but not limited to, meniscal injuries.

Description

technical field [0001] The present invention relates to apparatus and methods for manufacturing three-dimensional (3D) bioscaffolds, 3D bioscaffolds made using said methods, and implantation of said 3D bioscaffolds in the manufacture of injuries such as but not limited to meniscal injuries use in things. Background technique [0002] The menisci of the knee are two semilunar fibrocartilaginous disks located in the knee joint between the tibia and femur that improve stability and aid in rotational motion of the knee, act as shock absorbers and provide nourishment to the articular cartilage in the form of synovial fluid. In humans, meniscal structures occur not only in the knee joint, but also in the acromioclavicular, sternoclavicular, and temporomandibular joints. [0003] The meniscus is usually an avascular structure, with the main blood supply limited peripherally, with synovial fluid providing nourishment to the inner part of the meniscus by diffusion. The restricted b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/02A61L27/14A61L27/44A61L27/48
CPCA61F2/3872A61F2/08A61F2240/002A61F2/3094A61L27/18A61L27/50A61L27/56A61L2430/06A61F2240/001B29C64/245B29C64/209B29C64/118B29C64/255B29C64/106B33Y40/00C08L67/04A61F2/02D01D5/003A61F2/30756A61F2002/30766B29K2033/04B29K2105/0073B29L2031/753B29K2995/0056B29K2995/006B33Y10/00B33Y30/00B33Y80/00D10B2331/04D10B2401/12D10B2509/00
Inventor 田英山傅盈西孙捷王以仁方玉顺黄玉山李金兰郭一霖
Owner NAT UNIV OF SINGAPORE
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