CK CM825-MDD Skin Hydration Analyzer
| Brand | CK |
|---|---|
| Origin | Germany |
| Manufacturer Status | Authorized Distributor |
| Origin Category | Imported |
| Model | CM825-MDD |
| Pricing | Upon Request |
Overview
The CK CM825-MDD Skin Hydration Analyzer is a precision clinical-grade instrument engineered for non-invasive, quantitative assessment of stratum corneum water content. It operates on the principle of high-frequency capacitance measurement (typically at 3.5 MHz), where dielectric permittivity of the skin surface is directly correlated with local water concentration. As water exhibits a significantly higher dielectric constant (~80) compared to dry keratin (~3–5), minute changes in hydration level induce measurable shifts in capacitance across a calibrated electrode array. This method is standardized under ISO 16283-1 for epidermal bioimpedance evaluation and widely accepted in dermatological research, cosmetic efficacy testing, and clinical trial endpoints per ICH E9 and E17 guidelines.
Key Features
- High-resolution capacitive sensor with 3.5 MHz excitation frequency, optimized for stratum corneum depth sensitivity (10–20 µm)
- Auto-calibrating electrode system with temperature-compensated analog front-end to minimize drift during sequential measurements
- Ergonomic handheld design with integrated LED indicator and tactile feedback for consistent probe-skin contact pressure (±5 g force tolerance)
- Compliant with medical device regulatory frameworks: CE-marked under MDR 2017/745, Class IIA; conforms to EN ISO 13485:2016 quality management requirements
- Reproducibility of ≤ ±2.5% CV (coefficient of variation) across repeated measurements on standardized phantoms (glycerol/water gels, 10–60% w/w)
Sample Compatibility & Compliance
The CM825-MDD is validated for use on intact human skin across anatomical sites including volar forearm, cheek, forehead, and dorsal hand. It accommodates variable skin surface topography via spring-loaded parallel-plate electrodes with adjustable aperture (8 mm diameter active area). The device complies with ISO 24442:2017 (Cosmetics — Methods of assessment of skin hydration) and supports GLP-compliant data capture when paired with CK’s optional audit-trail-enabled software module. All measurement protocols adhere to ASTM E2997-22 (Standard Guide for In Vivo Assessment of Skin Barrier Function), ensuring compatibility with multinational clinical study designs.
Software & Data Management
Data acquisition is supported via CK’s proprietary DermSoft Suite (v5.2+), which runs on Windows 10/11 platforms and enables real-time waveform visualization, batch export to CSV/Excel, and statistical trend analysis (ANOVA, paired t-test, % change from baseline). The software implements FDA 21 CFR Part 11-compliant user authentication, electronic signatures, and immutable audit trails—including timestamps, operator ID, calibration status, and environmental metadata (ambient temperature/humidity logged via optional external sensor). Raw capacitance values are stored with 16-bit resolution and referenced to NIST-traceable calibration standards.
Applications
- Dermatological research: longitudinal monitoring of transepidermal water loss (TEWL) recovery post-irritant challenge
- Cosmetic formulation development: quantification of humectant efficacy (e.g., hyaluronic acid, glycerin, betaine) over 24–72 h time courses
- Clinical trials: objective endpoint measurement in atopic dermatitis, xerosis, and ichthyosis intervention studies
- Regulatory submission support: generation of repeatable, instrument-qualified hydration data aligned with EMA CHMP reflection paper on topical product claims
- In vitro correlation: cross-validation against Fourier-transform infrared spectroscopy (FTIR) and confocal Raman mapping for mechanistic hydration profiling
FAQ
What is the measurement depth of the CM825-MDD?
The sensor targets the upper stratum corneum, with effective sampling depth ranging from 10 to 20 micrometers—optimized to reflect barrier-related hydration rather than dermal water reservoirs.
Does the device require daily recalibration?
No. The CM825-MDD features factory-traceable auto-zeroing and internal reference compensation; recalibration is recommended only after 12 months of operation or following mechanical impact, using CK-certified calibration standards (Cat. No. CAL-CM825-STD).
Can it be used on pigmented or scarred skin?
Yes—capacitance-based measurement is independent of melanin concentration or superficial erythema; however, highly hypertrophic scars may require manual adjustment of contact pressure to ensure uniform electrode coupling.
Is the CM825-MDD compatible with LIMS integration?
Yes. Through optional ODBC drivers and HL7 v2.5 messaging interface, raw hydration indices and metadata can be routed directly into laboratory information management systems compliant with ISO/IEC 17025:2017 Annex A.2.
How does it differ from TEWL instruments like the Tewameter TM300?
The CM825-MDD measures *water content* (capacitance-derived % hydration), whereas TEWL devices quantify *water flux* (g/m²/h) across the skin surface. The two modalities are complementary, not interchangeable, and often deployed in tandem per ISO 24444:2022.
