# Wave bioreactors for seed-train expansion Single-use wave and rocking-bag bioreactors — Cytiva WAVE/Xuri, Sartorius Biostat RM, Thermo Fisher HyPerforma Rocker and Applitech AbioWave — that expand CHO, HEK293, stem-cell and cell-therapy seed trains under low-shear wave mixing without stirred impellers or clean-in-place. Source: https://en.bioecon.ru/technology/wave-bioreactors-seed-train-expansion/ Updated: 2026-08-18 ## Overview and value chain Markers: [EC: ASME BPE / USP <1043> / BPOG single-use standards | OECD: Industrial biotechnology | Regulator: FDA (USA), EMA (EU), NMPA (China)] Wave bioreactors are single-use rocking platforms in which a pre-sterilised flexible culture bag is rocked on an electrically driven base so that the liquid travels as a periodic wave, mixing and aerating the culture without a mechanical impeller or sparger. The format was introduced by Wave Biotech (now Cytiva's ReadyToProcess WAVE and Xuri lines) and is the workhorse of the N-1 seed train and early cell-expansion steps that feed every modern mAb, vaccine and cell-therapy process: the ReadyToProcess WAVE 25 runs up to a 25 L working volume in a gamma-irradiated Cellbag, Sartorius's Biostat RM spans a 2–200 L portfolio (1–100 L working volume) on Flexsafe RM bags, Thermo Fisher's HyPerforma Rocker runs Rocker BPCs to a 25 L working volume under the G3 Lab Controller, and Applitech's 艾贝泰 AbioWave covers the Chinese rocking-bioreactor market. Because there is no shaft seal or rotating impeller, shear stays low enough for shear-sensitive stem, CAR-T and ATMP lines that stirred tanks damage. Key directions of wave bioreactors for seed-train expansion: 1. **Rocking wave/rocker single-use bioreactors (Rocking-Wave SUB):** the core format — Cytiva ReadyToProcess WAVE / Xuri, Sartorius Biostat RM, Thermo Fisher HyPerforma Rocker, Applitech AbioWave — rocking a Cellbag/Flexsafe RM bag at 6–40 rpm for wave mixing. 2. **Low-shear cell-therapy and ATMP expansion (Low-Shear Cell-Therapy Expansion):** rocker platforms such as Xuri optimised for stem-cell, CAR-T and regenerative-medicine seed trains where impeller shear is prohibitive. 3. **Single-use Cellbag / Flexsafe RM formats (Single-Use Cellbag/Flexsafe RM):** gamma-irradiated 2–200 L EVA/UPE bags with integrated gas, sampling and harvest ports that define the format's closed, sterile workflow. 4. **Wave-based perfusion and N-1 intensification (Wave Perfusion/Intensification):** running the rocking bag in perfusion mode to densify the N-1 seed and cut the production bioreactor's turnaround time. ### Sectoral value chain ``` [polymers / bag film] ──> [Cellbag fabrication] ──> [gamma irradiation] │ │ (3D bag + ports) (25–40 kGy, SAL 10^-6) │ │ ▼ ▼ [inoculation & seed] <─── [wave/rocker platform] <──── [sterile single-use bag] │ ▼ [expanded seed train] ──> [harvest & transfer to production SUB] ``` ### Value chain levels | Level | Description | Key inputs/outputs | |:---|:---|:---| | **Bag film & materials** | EVA/UPE multilayer film, tubing, sampling/gas ports | **In:** polymer resins, gamma-stable additives. **Out:** fabricated Cellbag. | | **Cellbag fabrication & gamma** | 3D bag welding, port integration, 25–40 kGy gamma to SAL 10^-6 | **In:** fabricated bag. **Out:** sterile single-use bag. | | **Rocker/platform assembly** | bag loaded onto the rocking base with sensors and gas mixer | **In:** sterile bag, platform. **Out:** ready wave bioreactor. | | **Inoculation & wave culture** | seed at 0.3–0.5 million cells/mL, rocked at 6–40 rpm | **In:** seed, media, gases. **Out:** expanding culture. | | **Scale-up & perfusion** | fed-batch or perfusion expansion to densify N-1 seed | **In:** feed media. **Out:** high-density seed. | | **Harvest & transfer** | closed harvest and transfer to the production SUB | **In:** expanded culture. **Out:** N-1 inoculum. | Cross-cutting technologies of the sector: - **Low-shear wave mixing (Low-Shear Wave Mixing):** rocking at controlled angle and rpm to mix and aerate without an impeller. - **Single-use sensor integration (Single-Use Sensor Integration):** disposable pH/DO sensors and single-use gas filters in the Cellbag. - **Closed transfer to production SUB (Closed Transfer):** sterile welding and aseptic connection of the expanded seed to the stirred production tank. --- ## US The US originated the wave-bioreactor format (Wave Biotech, now Cytiva) and supplies the two US rocker platforms — Cytiva's WAVE/Xuri and Thermo Fisher's HyPerforma Rocker — that serve the US cell-and-gene-therapy and vaccine seed-train market. ### WAVE/Xuri origin, cell-therapy ATMP expansion, HyPerforma Rocker - **Cytiva ReadyToProcess WAVE 25 / Xuri:** the originating wave platform — WAVE 25 runs up to 25 L working volume in a Cellbag; the Xuri Cell Expansion System targets intensified cell-therapy and ATMP seed trains. - **Thermo Fisher HyPerforma Rocker:** a rocking-motion bioreactor on Rocker BioProcess Containers to a 25 L working volume, run by the HyPerforma G3 Lab Controller with TruBio software and a pH+dO₂ sensor, aimed at process development and seed-train production. - **FDA cell-and-gene-therapy framework:** the regenerative-medicine CMC guidance and 21 CFR Part 11 automation expectations shape the closed, single-use seed-train platforms used for autologous and allogeneic cell therapy. --- ## CN China is both the fastest-growing rocking-bioreactor market and the home of the domestic AbioWave platform, with Applitech (艾贝泰) supplying rocking single-use bioreactors into the expanding CN cell-therapy and vaccine build-out. ### AbioWave domestic platform, cell-therapy build-out, rocker market growth - **Applitech (艾贝泰) AbioWave:** the domestic rocking single-use bioreactor line, marketed across CN cell-culture applications and listed on the major CN bioprocurement channels under the AbioWave brand. - **CN cell-therapy demand:** the rocking platform's low-shear profile fits the autologous/allogeneic CAR-T and stem-cell expansion wave of CN biologics licensed under NMPA cell-therapy rules. - **Rocker market growth:** CN market analyses list the rocker/wave single-use bioreactor segment among the fastest-growing upstream equipment classes through 2032. --- ## EU The EU anchors the rocker-bag platform through Sartorius's Biostat RM family and the Flexsafe RM bag, and sets the single-use standards (ASME BPE, BPOG/BioPhorum, USP <1043>) that govern wave-bioreactor bag qualification. ### Biostat RM, Flexsafe RM bag, single-use standards - **Sartorius Biostat RM:** the EU rocker-bag family, a 2–200 L GMP-compliant portfolio (1–100 L working volume) on Flexsafe RM single-use bags, used for seed-train expansion and early GMP cell culture. - **ASME BPE & BPOG/BioPhorum:** the EU-led single-use system standards define extractables/leachables qualification, bag integrity and connection workflows that wave-bioreactor bags must meet. - **EMA Annex 2 continuous-process guidance:** the EU GMP framework accommodates the closed, single-use wave seed train inside continuous and intensified process designs. --- ## Leading companies and research institutes | Company / Institute | Country | Key products / platforms | Tech features | Status 2026 | |:---|:---|:---|:---|:---| | **Cytiva** | 🇺🇸 USA | *ReadyToProcess WAVE 25 / Xuri Cell Expansion* | Originating wave/rocker platform; WAVE 25 up to 25 L; Xuri for cell therapy; Danaher subsidiary | Commercial | | **Sartorius** | 🇩🇪 Germany | *Biostat RM / Flexsafe RM bags* | Rocking-motion portfolio 2–200 L (1–100 L working volume); GMP-compliant; Biobrain automation shared with Biostat STR | Commercial | | **Applitech** | 🇨🇳 China | *AbioWave (艾贝泰) rocking single-use bioreactor* | Domestic CN rocker platform on gamma-irradiated AbioBag; PLC control, OPC, 21 CFR Part 11 | Commercial | | **Thermo Fisher Scientific** | 🇺🇸 USA | *HyPerforma Rocker Bioreactor + Rocker BPCs* | Rocker BPC up to 25 L working volume; G3 Lab Controller with TruBio; pH+dO₂ sensor, load cell; cGMP-capable | Commercial | --- ## Tech stack and innovations The wave-bioreactor stack is built on rocking-wave hydrodynamics, single-use bag engineering and closed low-shear cell expansion. 1. **Rocking-wave mixing (Rocking-Wave Mixing):** - the platform rocks the bag at a controlled angle (6–10°) and rate (6–40 rpm), generating a travelling wave that mixes and aerates without an impeller or sparger. - case: Cytiva ReadyToProcess WAVE 25 and Sartorius Biostat RM. 2. **Single-use Cellbag / Flexsafe RM engineering (Single-Use Bag Engineering):** - gamma-irradiated EVA/UPE 3D bags with integrated gas, sampling and harvest ports, qualified to 25–40 kGy and SAL 10^-6 under USP <1043> and BPOG extractables/leachables. - case: Cytiva Cellbag and Sartorius Flexsafe RM. 3. **Low-shear cell-therapy expansion (Low-Shear Cell-Therapy Expansion):** - rocker platforms tuned for stem-cell, CAR-T and ATMP lines where impeller shear damages cells; integrated single-use pH/DO sensors and closed transfer to the production SUB. - case: Cytiva Xuri Cell Expansion System and Thermo Fisher HyPerforma Rocker. --- ## Value chains and production pipelines ### Industrial pipeline of a wave-bioreactor seed-train campaign (ASME BPE / USP <1043> / BPOG) ``` ┌───────────────────────────┐ ┌───────────────────────────┐ │ 1. Bag film & Cellbag fab │ ───> │ 2. Gamma irradiation │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 4. Inoculation & wave cult│ <─── │ 3. Platform loading │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 5. Scale-up & perfusion │ ───> │ 6. Harvest & SUB transfer │ └───────────────────────────┘ └───────────────────────────┘ ``` #### Stage 1: Bag film & Cellbag fabrication EVA/UPE multilayer film is extruded, welded into a 3D Cellbag with gas, sampling and harvest ports, and integrated with single-use pH/DO sensors and gas filters. #### Stage 2: Gamma irradiation The fabricated bag is gamma-irradiated to 25–40 kGy to a Sterility Assurance Level of 10^-6 and qualified for extractables and leachables under USP <1043> and the BPOG model. #### Stage 3: Platform loading The sterile Cellbag is loaded onto the wave/rocker platform (Cytiva WAVE/Xuri, Sartorius Biostat RM, Thermo Fisher HyPerforma Rocker, Applitech AbioWave), connected to the gas mixer and single-use sensors, and inoculated. #### Stage 4: Inoculation & wave culture Cells are seeded at 0.3–0.5 million cells/mL and the bag is rocked at 6–40 rpm and a 6–10° angle; the travelling wave mixes and aerates the culture without an impeller, sustaining CHO, HEK293, stem-cell and CAR-T expansion. #### Stage 5: Scale-up & perfusion The culture is expanded by fed-batch or perfusion to densify the N-1 seed — wave perfusion lifts cell density high enough to cut the production bioreactor's turnaround time. #### Stage 6: Harvest & SUB transfer The expanded seed is harvested in closed mode and aseptically transferred via sterile welding into the stirred production single-use bioreactor, completing the seed-train step.