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Stage top incubator

Culture cells on top of the microscope stage for long periods
Accurate temperature control

Keep your cells at 37°C ± 0.5°C outside the CO2 incubator

Up to 3 simultaneous cell cultures

Test different conditions in the same system

High quality image gathering

Bottom glass window can be adjusted to your microscopy needs

Stage top incubator setup

The stage top incubator is compact and can be easily manipulated to be put on a microscope while maintaining dynamic perfusion and temperature control. The stage-leading incubator can hold up to 3 chips simultaneously and can easily be stacked for parallelization.

thermal chamber setup

A stage top incubator pack contains:

  • Stage top incubator
  • OB1 flow controller (Elveflow)
  • Several Eppendorf or Falcon reservoirs
  • Tubings and luers
  • Microfluidic chips, if needed
  • Microfluidic flow sensor (eg. Galileo
  • User guide
  • Software (Galileo user interface)

 

An OB1 MK4 flow controller performs the media flow for dynamic perfusion, which applies pressure to the reservoirs to induce the flow. A flow sensor is then added to the setup with a feedback loop to the OB1 that allows maintenance of reasonable control of the flow rate inside the Stage top incubator during the experiment.

 

This pack can be combined with microfluidic functions like recirculationsequential injection, bubble trapping, cell-cell interaction monitoring, etc.

 

Our Research & Innovation team is exploring this product. Contact our experts if you are interested in it, its applications, or possible variations to better suit your needs!

Static live cell imaging: Microglial cell culture

According to the protocol published by Sepulveda et al., Glia, 2016, primary microglial cells were isolated from mice pups’ brains.

Primary mouse microglial cells were prepared and kindly provided by Patrick P. Michel and Rocio Gimenez from the Brain and Spine Institute in the frame of the LOCAI project.

 

Cells were passaged after one week of isolation onto Ibidi chips (µ-Slide III 3D Perfusion, cat. 80376) at 150 000 cells/mL density. Cell medium was supplemented with FBS and PS. HEPES in powder was added to a final concentration of 20 mM. Once the HEPES dissolved, the pH was corrected and brought to 7.2 using Na 1 N, and then the media was filtered using a 0,22 filter. Cells were left to attach overnight in an incubator at 37°C and 5% CO2.

 

 

Hardware

  • OB1, MK4 (Elveflow)
  • Microfluidic flow sensor (eg. Galileo
  • Tubings (1/32″ ID), fittings and reservoirs 
  • IBIDI µ-Slide III 3D perfusion 
  • 8 cm of 100 µm inner diameter microfluidic resistance 
  • Microfluidic male and female Luer to ¼” -28 connectors 
  • Laminar flow hood
  • Standard Incubator for cell attachment, stage top Incubator for experiment

 

 

Chemicals

  • Dulbecco’s modified Eagle’s medium (DMEM)
  • Penicillin/Streptomycin, 10,000 U/ml, 10mg/ml Streptomycin, PAN biotech
  • FBS, 0.2 µm sterile filtered, PAN Biotech
  • HEPES is used to buffer pH in the absence of CO2 control.

 

 

Software

 

 

Design of the chip

Interface typeFemale Luer
Well diameter5.5 mm
Well height1.7 mm
Volume per well30 μl
MaterialIbidi Polymer Coverslip
Surface treatmentbitrate
Growth area per well25 mm2

 

As a proof-of-concept of the efficacy of the stage top incubator in maintaining ideal conditions for live cell imaging, primary mouse microglial cells were cultured in static conditions for 48h inside it. The figure below show the results after 8h and 48h of stimulation with LPS.

microglial-cell
Figure 1. Mouse microglial cells seeded in a µ-slide III 3D perfusion chip well and maintained in the stage top incubator on the microscope under static conditions for 8 hours after LPS stimulation. Cells were challenged with 10 ng/mL LPS at t = 0 h (a). Micrographs in phase contrast were acquired every 30 minutes for 8 hours (b). The micrographs correspond to the same observation field.
LPS Static T0h 48h microglia cells v2-1
Figure 2. Mouse microglial cells seeded in a µ-slide III 3D perfusion chip well and maintained in the stage top incubator under static conditions for 48 hours after LPS stimulation. Cells were challenged with 10 ng/mL LPS at t = 0 h. Microglial cell cultures at t = 0 h (a) and cells at t = 48 h (b) after LPS addition. The micrographs correspond to different observation fields.

Dynamic live cell imaging: HEK293 cells under flow

Downscaling cell cultures to the organ-on-chip technology implies that heat and mass transfer much faster and more efficiently in or out of the chip. This allows the media to reach the right temperature quickly after entering the Stage Top Incubator, even at high flow rates.

HEK293 cells were maintained in standard cell biology practices, with passages twice weekly.

Hardware

  • OB1, MK4 (Elveflow)
  • Wide-range flow sensor (Galileo
  • Tubings (1/32” ID), fittings and reservoir
  • IBIDI µ-Slide Luer – 400 µm in height (permeable, polymer coverslip, and impermeable, glass coverslip 
  • 10 cm of 175 µm inner diameter microfluidic resistance
  • Microfluidic male and female Luer to ¼”-28 connectors 
  • Laminar flow hood
  • Standard Incubator for cell attachment, stage top incubator for experiment
  • pH optical sensor, in-house developed flow cell

 

 

Chemicals

  • Dulbecco’s modified Eagle’s medium (DMEM)
  • Penicillin/Streptomycin, 10,000 U/ml, 10mg/ml Streptomycin, PAN biotech
  • FBS, 0.2 µm sterile filtered, PAN Biotech

 

 

Software

 

 

Design of the chip

 

Gas impermeable – Glass Coverslip

Outer dimensions 25.5 x 75.5 mm² (w x l)
Channel length 50 mm
Channel width 5 mm
Adapters Female Luer
Volume per reservoir 60 μl
Growth area 2.5 cm2
Bottom: Glass coverslip No. 1.5H, selected quality, 170 µm +/- 5 µm


Gas permeable – Polymer Coverslip

Outer dimensions (w x l) 25.5 x 75.5 mm²
Channel length 50 mm
Channel width 5 mm
Adapters Female Luer
Volume per reservoir 60 μl
Growth area 2.5 cm2
Coating area 5.2 / 5.4 / 5.6 / 5.8 cm2
Bottom: IBIDI polymer coverslip

The stage top incubator was used to culture HEK293 cells under flow on the microscope stage for 60 hours. The pH was continuously monitored, and images were taken at defined time points. The gas permeability of the chips was assessed to understand the influence of lack of CO2 control on cell culture outside the CO2 incubator. Cells grew and multiplied in both conditions, with the impenetrable chip showing more considerable pH variations without negatively impacting cell doubling.

stage top incubator application
Figure 3. Microfluidic culture of HEK293 cells in the Stage top incubator with continuous pH monitoring. a. pH measurements of gas impermeable and permeable chips during cell culture. Measurements of cells cultured in the impermeable chip showed larger pH variations than those in the gas-permeable chip. b. Bright-field images of cells during culture at defined time points. Initial cell concentrations: permeable chip: 2.43×106 cells/ml; impermeable chip: 1.9×106 cells/ml. Scale bars, 100 µm.

Stage top incubator specifications

The Stage Top Incubator was designed to allow cell culture on top of the microscope stage for live cell imaging. As the animation shows, it will enable homogenous temperature transfer across its working area.

 

The solutions are thermalized as they enter the chip, keeping a homogenous temperature throughout. Thus, solutions can be preheated at the desired temperature before entering the chip.

Stage top incubator temperature illustration

The table below summarizes its main specifications.

 

CharacteristicSpecification
Dimensions (mm)30.5 x 130 x 168 (h x w x l)
Base K- Frame3.5 x 110 x 160 (h x w x l)
Dimensions of internal usable space25 X 89 x 130 (h x w x l)
Dimensions of the bottom glass (ITO glass)

1) 72 X 110 with a thickness of 1.1 mm

2) 50 x 25 with a thickness of 0.6mm

3) 50 x 22 with a thickness of 0.12 mm

Temperature rangeRoom Temperature to 70 oC
Temperature accuracy± 0,5 oC
External MaterialAluminum and ITO glass

The stage top incubator is controlled by a converter connected to software (both included). Also, it is compatible with 1/16″ and 1/32″ ID tubing.

stage top incubator back view

Customize your stage top incubator

Several commercialized and laboratory-made microfluidic chips have been developed and tested recently to perform dynamic cell cultures efficiently. We can include one of them with different surface modifications inside the pack. A chip can also have several separate channels.

 

Our products and packs are fully customizable to fit your needs perfectly. Our microfluidic specialists and researchers will help you choose the best instruments and accessories and accompany you during the setup of the microfluidic platform until you can obtain your first experimental results.

 

Contact our experts to answer any questions about this stage top incubator for microfluidics pack and how it can match your specifications!

 

 

– Check our other Packs for various applications –

 
Can the stage top incubator be sterilized?

Yes, we have developed a simple protocol for sterilization and cleaning that is provided along with the user guide.

The Stage Top Incubator was designed to be kept outside the CO2 incubator, but it can be adapted on demand.

No, the Stage Top Incubator allows gas exchange with the atmosphere.

No, the reservoirs can be kept at room temperature. The Stage Top Incubator was designed to ensure that the media reaches the cells at the desired temperature regardless of the temperature of the reservoirs.

Funding and Support

The Protomet, ACDC, and LOCAI projects results helped develop this instrument pack, with funding from 

the European Union’s Horizon 2020 MSCA-ITN under grant agreement No 813873 (ProtoMet),

the European Union’s Horizon 2020 research and innovation program under grant agreement No 824060 (ACDC project), 

and French National Research Agency (ANR) and the German Federal Ministry of Education and Research (BMBF) in the frame of the 1st German-French Joint Call for proposals on Artificial Intelligence.

 

     Paris Brain Institute LogoLOCAI_logoProtomet-droplet_microfluidics_elveflow_protometabolism_logoANR_Elvesys-microfluidics-artifical intelligencelogo european commission

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