Instech Single-Channel Fluid Swivel
| Origin | USA |
|---|---|
| Manufacturer Type | Distributor |
| Origin Category | Imported |
| Model | Swivel |
| Pricing | Upon Request |
Overview
The Instech Single-Channel Fluid Swivel is a precision-engineered, laboratory-grade fluid rotary coupling designed for chronic in vivo infusion and sampling applications in preclinical research. Operating on the principle of low-torque, sealed rotational interface between stationary and rotating fluid paths, it enables uninterrupted delivery of therapeutics, nutrients, or experimental compounds—while simultaneously permitting unrestricted animal movement during tethered studies. Unlike passive gravity-fed or intermittent bolus systems, this swivel maintains continuous laminar flow integrity across extended durations (72+ hours), minimizing shear-induced degradation of biologics and preserving physiological relevance in conscious, freely moving rodent and large-animal models. Its core architecture eliminates dead volume accumulation and flow stagnation zones—critical for pharmacokinetic accuracy, microdialysis fidelity, and avoidance of thrombus formation in vascular cannulation setups.
Key Features
- Precision-machined stainless steel or medical-grade plastic body with chemically inert internal wetted surfaces (316L SS and PTFE)
- Self-adjusting elastomeric seal at the rotational center—maintains consistent torque performance over >10,000 rotation cycles without lubrication
- Minimal internal dead volume (< 1.2 µL for 25G stainless steel variant) to reduce sample dilution and delay in compound delivery
- Low-torque design (< 0.05 N·cm static friction) prevents entanglement, reduces animal stress, and ensures reliable long-term operation
- Compatible with standard gauge catheters (18–25G) and Luer-lock interfaces; available in sterile, pyrogen-free configurations for aseptic surgical implantation
- Modular mounting system supports integration with Instech’s CMA/120 gimbal arms, cage-mounted swivel holders, and custom infusion kits
Sample Compatibility & Compliance
The swivel accommodates a broad spectrum of biological fluids—including whole blood, plasma, cerebrospinal fluid (CSF), dialysate, and viscous drug formulations—without compromising flow stability or introducing particulate contamination. All plastic variants are gamma-irradiated and certified sterile per ISO 11137. Stainless steel models meet ASTM F899 standards for surgical-grade alloys and are compatible with USP Class VI extractables testing protocols. The device is routinely deployed in GLP-compliant toxicology studies and FDA-regulated IND-enabling pharmacology programs where traceability, material biocompatibility, and mechanical reproducibility are mandated per 21 CFR Part 11 requirements for electronic records and audit trails.
Software & Data Management
While the swivel itself is a passive mechanical component, its integration into Instech’s broader infusion ecosystem enables seamless synchronization with third-party data acquisition platforms—including ADInstruments LabChart, DATAQ DI-158U, and National Instruments DAQmx—via synchronized TTL triggers from connected peristaltic pumps or automated blood sampling modules. When used with Instech’s programmable infusion controllers (e.g., Model 400 Series), real-time pressure monitoring, flow rate validation, and event-logged swivel rotation counts can be archived alongside physiological telemetry (ECG, BP, locomotor activity) for temporal correlation analysis. Audit-ready log files support full traceability from device lot number to individual animal ID and study protocol version.
Applications
- Chronic intravenous, intracerebroventricular (ICV), or subcutaneous infusion in rats, mice, rabbits, and non-human primates
- Microdialysis sampling with dual-channel quartz-lined variants to prevent analyte adsorption and improve recovery of neurotransmitters (e.g., dopamine, serotonin)
- Automated serial blood collection using Instech’s SPS-2000 system, where swivel integrity directly impacts hematocrit consistency and clotting artifact reduction
- Long-term metabolic studies requiring uninterrupted parenteral nutrition or insulin delivery
- Neuropharmacology experiments involving simultaneous drug infusion and electrophysiological recording via head-mounted tether assemblies
- Cardiovascular safety pharmacology models integrating arterial pressure telemetry with continuous vasoactive agent administration
FAQ
What is the maximum recommended continuous rotation speed for the 375/2525GA swivel?
Instech specifies a maximum operational rotation rate of 15 RPM under constant load; higher speeds may accelerate seal wear and compromise long-term hermeticity.
Can the plastic swivels be reused after sterilization?
No—plastic swivels (e.g., 375/20PS) are single-use, terminally sterilized devices. Re-sterilization via autoclave or ethylene oxide is not validated and may degrade PTFE sealing integrity.
How does the quartz lining in dual-channel microdialysis swivels improve analytical performance?
Quartz minimizes surface adsorption of polar analytes (e.g., amino acids, peptides) and reduces nonspecific binding compared to stainless steel or polymer surfaces—yielding higher recovery rates and lower detection limits in HPLC-MS assays.
Is the swivel compatible with heparinized saline flush protocols?
Yes—both stainless steel and plastic variants tolerate standard heparin concentrations (1–10 U/mL) without seal swelling or flow resistance increase; however, prolonged exposure (>7 days) to >50 U/mL heparin is not recommended.
What mounting hardware is required for secure cage-side installation?
A rigid Instech Swivel/Cage Mount (Model CM-120) or GIMBAL/CM A-frame holder is required to prevent lateral flexure and ensure axial alignment—free-hanging installations induce premature seal failure.
