Adhesive Sterile Vent For Autologous Cell Therapy / CAR T Cryobags

The adhesive sterile vent for autologous cell therapy and CAR-T cryobags is an ultra-high-purity, cryogenic-compatible sterile barrier component engineered for the most demanding and valuable pharmaceutical products in modern medicine. This vent integrates a medical-grade, extremely low-extractable ePTFE membrane with a validated cryogenic-stable adhesive carrier, designed for direct application to the ports of single-use cryopreservation bags used to store, freeze, transport, and thaw patient-specific cell therapies, including Chimeric Antigen Receptor T-cell (CAR-T) products, stem cell concentrates, and autologous cell therapies. It provides a sterile, bacteria-retentive airway that allows the cryobag to equalize pressure during freezing to cryogenic temperatures (typically -196°C in liquid nitrogen vapor phase), during air transport in dry shippers, and during rapid thawing at 37°C. The vent maintains an absolute microbial barrier throughout the entire process, protecting the irreplaceable, life-saving cell product from contamination and preserving its viability and therapeutic potency.

Autologous cell therapies, including CAR-T, are manufactured from the patient's own cells. The process involves leukapheresis, genetic modification and expansion in a cell processing center, formulation, filling into cryopreservation bags, controlled-rate freezing, storage in liquid nitrogen vapor phase, transport in cryogenic dry shippers, and finally thawing and infusion at the patient's bedside. At every step, the cryobag experiences extreme temperature swings and associated pressure changes. The bag and its ports must remain hermetically sealed. Without a vent, the pressure differential during freezing and thawing can stress the bag seals and tubing welds, causing failure and loss of the product. Any breach in the closed system that allows microbial contamination is catastrophic—the product cannot be terminally sterilized, and there is no second chance for the patient. The vent must be functional and intact at -196°C, must not leach any compounds into the cryopreservation medium (which contains dimethyl sulfoxide, DMSO), and must not become brittle or detached from the bag port.

The adhesive sterile vent is applied to a dedicated port on the cryopreservation bag during the manufacturing process. The ePTFE membrane is hydrophobic and provides a 0.2-micron sterile barrier. During freezing and thawing, as the bag contents contract and expand, the vent allows sterile gas exchange, equalizing pressure and preventing mechanical stress on the bag seals. The membrane is functional at cryogenic temperatures—it remains flexible and does not crack or shatter. The adhesive is a specially formulated silicone or cryogenic acrylic that maintains its bond strength and flexibility from -196°C to +40°C, through repeated freeze-thaw cycles. The materials are the highest purity available, with comprehensive extractables and leachables testing demonstrating suitability for direct contact with the cryopreservation medium and the cell product.

• CAR-T cell cryopreservation bags

• Hematopoietic stem cell (HSC) transplant cryobags

• Autologous and allogeneic cell therapy product bags

• Cord blood and cord tissue cryostorage bags

• Cell bank master and working cell bank cryobags

• Gene-modified cell product storage bags

• Cell therapy manufacturing intermediate hold bags

The vent is pre-sterilized and applied to the cryobag port under aseptic conditions. The cell suspension in cryopreservation medium (containing 5-10% DMSO) is filled into the bag, and the bag is sealed. The bag is placed in a controlled-rate freezer, where it is slowly cooled to approximately -80°C, then transferred to liquid nitrogen vapor phase storage at -150°C to -196°C. As the contents freeze and contract, the vent allows filtered nitrogen gas to enter the bag to replace the volume, preventing vacuum. During thawing at 37°C at the bedside, the expanding liquid draws filtered gas out through the vent. The sterile barrier is maintained throughout. The cryogenic-stable adhesive keeps the vent securely attached, and the ultra-pure materials ensure that no harmful leachables contaminate the cell product.

1. Identify the cryopreservation bag film material to select a compatible adhesive or weldable carrier.

2. Determine the bag volume and the expected freeze-thaw temperature profile to size the vent airflow.

3. Select the adhesive for cryogenic application: validated for liquid nitrogen vapor phase temperatures.

4. Conduct comprehensive extractables and leachables testing with your specific cryopreservation medium (including DMSO concentration).

5. Validate the complete cryobag system: pressure testing during freezing and thawing, bacterial challenge at cryogenic temperatures, and cell viability studies post-thaw.

• Q: Will the vent crack or shatter at liquid nitrogen temperatures?
  A: No, the ePTFE membrane remains flexible and the adhesive is specifically formulated to retain its elasticity at cryogenic temperatures. The vent is validated for use at -196°C.

• Q: Does the vent allow liquid nitrogen to enter the bag during immersion?
  A: The hydrophobic membrane prevents liquid ingress. The vent is designed for vapor phase storage, but will also prevent liquid LN2 entry during brief accidental immersion.

• Q: Will the DMSO in the cryopreservation medium leach compounds out of the vent?
  A: The vent materials are ultra-pure and validated for low extractables in the presence of DMSO-based cryopreservation media. We provide comprehensive E&L data for your regulatory filing.

• Q: How long will the vent maintain sterility in long-term cryostorage?
  A: The vent is validated for sterility maintenance for the expected storage duration of the cell therapy product, typically 3-5 years or more in liquid nitrogen vapor phase.

• Q: Can the vent be aseptically applied in the cell therapy manufacturing cleanroom?
  A: Yes, we supply pre-sterilized vents in validated sterile packaging for aseptic application during the fill-finish process.