Bioreactor for tissue engineering and biomanufacturing

Who it is for

• Regenerative medicine and tissue-engineering companies testing scaffold, perfusion and bioink designs
• Organ-on-chip and heart-on-chip developers validating automated platforms
• Pharmaceutical companies using engineered tissues for cardiac safety and disease models
• University tissue-engineering and stem-cell labs
• Space agencies studying astronaut tissue health (cardiac, cartilage, bone)
• In-space biomanufacturing start-ups needing short, recoverable precursor flights

What earlier flights found

How LELP-1 runs it

Sample. Pre-formed 3D engineered tissue constructs, for example chondrocyte-seeded porous scaffold discs or iPSC-cardiomyocyte tissues. 2 constructs in each of 4 independent perfusion chambers (8 constructs per bay), all from one batch shared with the ground control. Container. Large-bay perfusion module: 4 sealed perfusion chambers on a closed-loop flow path, a medium reservoir, a waste bag, fixative, RNA-stabilizer and rinse reservoirs, a silicone membrane gas exchanger with a bubble trap, in-line pH, dissolved-oxygen and glucose/lactate sensors, a camera, and a small thermoelectric cold pad under each chamber plus an insulated pocket for medium aliquots, so fixed chambers can be held at 4 C inside the 37 C bay. Launch. Live constructs, matured on the ground, in HEPES-buffered medium at 37 C; late-loaded about 48 h or less before launch with the bay powered. Light and gas. Dark except short LED pulses for imaging. No CO2 supply, so the medium is HEPES-buffered. Oxygen reaches the medium from the sealed bay air through the membrane gas exchanger. pH and dissolved oxygen are logged continuously.

1. day -2

   Load constructs into the 4 chambers, prime medium, seal bay, start 37 C hold and slow perfusion; late load into LELP-1.

2. day 0

   Launch. Perfusion paused or at minimum flow during ascent; temperature, pressure and acceleration logged.

3. day 1

   After orbit checkout: start nominal intermittent perfusion, take baseline images of every construct, log pH, dissolved oxygen, glucose and lactate.

4. day 2

   Early time point: chamber A is valved off, drained and filled with 4% paraformaldehyde. After 24 h it is flushed with buffer and its cold pad cools it to 4 C.

5. day 3

   Days 3-6: daily partial exchange of fresh medium; spent-medium aliquot to the cold pocket; imaging every 6 h (construct size and shape; beat rate for cardiac tissue).

6. day 7

   Mid time point: chamber B fixed and cooled as for chamber A. Optional test compound added to chamber C; chamber D stays as the untreated control.

7. day 8

   Days 8-12: continue feeding, sensing and imaging; robotic-arm moves scheduled outside imaging windows.

8. day 13

   End point: chamber C fixed in paraformaldehyde and later flushed with buffer; chamber D filled with RNA stabilizer. Whole bay then set to 4 C.

9. day 14

   Lab operations end; bay held at 4 C through deorbit, splashdown and courier hand-over.

The payload module, in CAD

Every item in the module sheet, drawn and packed into the large bay deck by deck. The back face mates with the bay: blind-mate connector, and a cold wall against the bay's thermoelectric block. The front face carries Dexter-L's grapple fixture, and the fluid lines run down a channel just behind it. What you load before launch is marked blue in the configurator's payload guide.

CAD generated by cad/build_modules.py (CadQuery, OpenCascade kernel) from the catalog's module items: concept geometry, not a released design. Standard parts keep their real formats; the rest are sized from their catalog mass. The front panel and grapple fixture are left off in the 3-D view and are in the STEP.

• One camera sees all four chambers from 75 mm (about 90 degrees diagonal); per-chamber close-ups would need a moving camera, which is not in the catalog's mass.
• Reagent volumes the catalog does not state are split evenly from 75 % of the reservoir item's mass. The waste bag holds the spent medium and washes; fixatives and stabilisers stay in the wells and come home.
• Fluid pack: 4 reagent bags in 4 layers (97 x 146 x 92 mm), every port on a front edge.
• The waste bag lies under the reagent bags and fills the room they free: they hold 512 mL, it needs 338 mL.
• The catalog gives 1.10 kg for structure and containment; as an aluminium box that is a 0.52 mm skin on 0.33 kg of posts and shelves.
• The grapple fixture stands 26 mm proud of the front panel, into the bay opening; everything else is inside the bay envelope.

Ground control

An identical perfusion module in a ground bay with constructs from the same batch, run at 1 g on the same feeding, imaging and fixation timeline. It is offset by a few hours so it can replay the flight temperature log. Launch vibration and re-entry loads are replayed on a shaker where possible. An optional third group in a rotating-wall or clinostat setup separates flow and shear effects from gravity effects.

Coming home

Fixed and RNA-stabilized constructs and medium aliquots should stay at 4 C from the end of operations to the customer lab. About 20 min to the courier plus 1-2 days of transport fits within 72 h. Mechanical testing needs live, unfixed constructs. A live-return option would need the bay held near 37 C (or at a validated holding temperature) through recovery, which has not yet been demonstrated for LELP-1.

Limits of this flight

• 14 days is short for tissue growth. The Mir cartilage ran 4 months after 3 months on Earth. LELP-1 suits early responses and method tests, not growing mature tissue.
• Microgravity has not been shown to make better tissue. Mir cartilage was smaller and mechanically weaker, and ISS heart tissues lost contractile force. Customers should expect to study gravity effects, not to receive a better product.
• No crew. On CRS-20 the crew exchanged medium by syringe; on LELP-1 every medium change and fixation must be automatic, and nobody can clear a blocked line. Gas bubbles do not rise in microgravity, so the flow path needs a bubble trap and fully automatic recovery.
• No CO2 supply. The Mir BTS used 10% CO2 and the CRS-20 incubator used 5% CO2. HEPES-buffered medium changes metabolism compared with those setups, so the ground control must use the same medium.
• Oxygen comes only from the sealed bay air, and the cells' CO2 builds up there. The gas budget must be sized for each customer, because cardiac tissue uses far more oxygen than cartilage.
• Live tissue must wait about 2 days at the pad and survive ascent loads. Returned tissue is fixed or stabilized, so mechanical properties cannot be tested after return unless a live-return mode is developed.
• Robotic-arm moves raise acceleration to about 1e-4 to 1e-3 g.
• Volumes are millilitres and there are 8 constructs per bay: a research-scale study, not production biomanufacturing.
• In-line glucose/lactate sensing and the per-chamber cold pads are our design choices and have not flown on LELP-1.