Digerui DKR-NT3-3 Intradermal Needle Tip Sharpness and Penetration Force Tester

Overview

The Digerui DKR-NT3-3 Intradermal Needle Tip Sharpness and Penetration Force Tester is a precision mechanical property tester engineered for objective, repeatable quantification of needle tip sharpness and penetration resistance—critical parameters in the design, manufacturing, and quality control of intradermal (ID) injection devices, microneedles, and minimally invasive surgical needles. Operating on the principle of controlled axial force application against standardized test substrates (e.g., synthetic skin mimics or calibrated polymeric membranes), the instrument measures peak penetration force (in Newtons) and displacement profiles with high-resolution load cell feedback. Designed in accordance with ISO 7886-1:2017 (Sterile hypodermic needles for single use — Part 1: Requirements and test methods) and aligned with ASTM F2182-22 (Standard Test Method for Measurement of Penetration Force of Hypodermic Needles), the DKR-NT3-3 supports regulatory-compliant validation protocols required by medical device manufacturers under ISO 13485 and FDA QSR 21 CFR Part 820.

Key Features

• Motor-driven linear actuator with programmable speed control (0.1–100 mm/min) and position resolution ≤1 µm
• High-accuracy S-type load cell (±0.5% FS, 0–50 N range) with real-time force sampling at ≥1 kHz
• Modular test fixture platform accommodating needle gauges from 26G to 32G (0.45–0.23 mm OD) and lengths up to 15 mm
• Integrated optical alignment aid for precise perpendicular needle-to-substrate orientation
• Compliance with GLP/GMP documentation requirements via timestamped, user-identifiable test records
• Robust aluminum alloy frame with anti-vibration base and ESD-safe enclosure for cleanroom-compatible operation

Sample Compatibility & Compliance

The DKR-NT3-3 accepts standard intradermal needles mounted in ISO-compliant holders and interfaces with widely adopted reference substrates—including multilayer silicone elastomer stacks (ASTM F2182-22 Annex A1), porcine cadaver skin analogs, and certified polymer membranes (e.g., polyurethane films per USP <1207>). All test configurations are traceable to NIST-calibrated force standards. The system supports audit-ready compliance reporting for ISO 13485:2016 clause 7.5.2 (Validation of processes for production and service provision), ISO 14971:2019 (Risk management of medical devices), and EU MDR Annex I General Safety and Performance Requirements (GSPR 10.1 & 10.2). Optional IQ/OQ documentation packages are available upon request.

Software & Data Management

The instrument operates via Digerui’s proprietary NT-Soft v3.2 control and analysis suite, running on Windows 10/11 platforms. Software features include: real-time force-displacement curve visualization; automated pass/fail evaluation against user-defined thresholds; batch test sequencing with metadata tagging (operator ID, lot number, substrate batch); export of raw data in CSV and XML formats compliant with FDA 21 CFR Part 11 (electronic signatures, audit trail, role-based access control). All data files are digitally signed and time-stamped using embedded hardware security module (HSM)-assisted cryptography. Raw datasets retain full traceability for retrospective analysis during CAPA investigations or regulatory inspections.

Applications

• Validation of needle tip geometry post-sharpening (e.g., bevel angle, edge radius, symmetry)
• Comparative evaluation of coating effects (e.g., silicone lubrication, hydrophilic polymers) on insertion force
• Stability testing of needle sharpness after accelerated aging (ISO 11607-1)
• Design verification for microneedle arrays used in transdermal drug delivery systems
• Supplier qualification testing for OEM needle component procurement
• Root cause analysis of clinical reports of painful insertion or tissue trauma

FAQ

Does the DKR-NT3-3 comply with ISO 7886-1:2017 for intradermal needle testing?

Yes—the instrument implements the prescribed test method including specified substrate thickness (1.5 ± 0.1 mm silicone rubber), penetration speed (100 ± 10 mm/min), and force measurement criteria.
Can the system be integrated into an existing LIMS or MES environment?

Yes—via OPC UA or RESTful API interfaces; custom middleware development support is available under NDA.
Is calibration certification included with shipment?

Each unit ships with a factory calibration certificate traceable to CNAS-accredited standards; optional UKAS/NIST-traceable recalibration services are offered annually.
What maintenance is required for long-term accuracy?

Annual verification of load cell linearity and actuator repeatability is recommended; no consumables or routine part replacement is required within the first 5 years of operation.
Does Digerui provide installation qualification (IQ) and operational qualification (OQ) documentation?

Yes—validated IQ/OQ templates compliant with Annex 15 of the EU GMP Guide and FDA Guidance for Industry: Process Validation are supplied as part of the optional GxP Package.