Specification builder · Tier B
Optical measuring microscope with XY measuring stage, linear scales and video edge detection, for non-contact measurement and inspection of small medical-device features
A measuring microscope magnifies a small part and measures it without touching it, using a precision XY stage with linear scales, transmitted, coaxial and ring lighting and, in modern versions, a camera with software that finds edges automatically. Drug and device testing labs and needle, cannula and catheter makers use it to inspect needle points and bevels for burrs and hooks and to measure lumen diameters, wall thickness, cannula ends and catheter tips. A camera-only video measuring system is the faster, more expensive option for high-volume production.
What this equipment will do
- Sample types: hypodermic needles, IV cannulas and stylets, needle tubing, catheter tips and small medical tubing.
- Needle points: inspection for burrs, hooks and feather edges under magnification (ISO 7864).
- Catheter tips and distal ends: tip profile and opening examined and measured under magnification (ISO 10555-1).
- Lengths and distances, including those longer than one field of view, measured with the XY stage scales to a stated accuracy formula.
- Needle bevels: side views of primary and secondary bevels by rotating the needle in a holder. (with the optional module)
- Needle tubing: lumen (inside) diameter and wall thickness from an end view of the needle or cannula (ISO 9626). (with the optional module)
- Circles, diameters, radii and angles calculated from measured points, with tolerance pass/fail. (with the optional module)
- Camera view with automatic edge detection, so readings do not depend on the operator's eye. (with the optional module)
- Saved images with the measured dimensions and scale bar overlaid, for test reports. (with the optional module)
- Fine burrs, scratches and coating defects shown with dark-field or polarised light. (with the optional module)
- Heights and depths, by focusing on two surfaces. (with the optional module)
- Automatic measurement of several parts in one programmed run. (with the optional module)
Not covered: Needle sharpness (penetration force through a test film) needs the needle penetration force tester; the microscope only shows the point shape.; Needle hub bond strength, needle stiffness and breakage need force testing equipment such as the digital force gauge with test stand (ISO 7864, ISO 9626).; Surface roughness and 3D surface shape need a roughness tester or 3D optical profiler; the microscope gives 2D outlines and images.
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Standards this specification draws on
- IEC 61010-1 Basic electrical safety standard for measurement and laboratory equipment, covering the LED illuminators, controller, motorised axes and power supplies.
- IEC 61326-1 EMC requirements for laboratory and measurement equipment, so scales, camera and controller are not disturbed by or disturbing other equipment.
- ISO 7864:2016 Sterile hypodermic needles; the microscope is used to inspect needle points for burrs, hooks and feather edges and to measure bevel features.
- ISO 9626:2016 Stainless steel needle tubing; outside diameter, inside (lumen) diameter and wall dimensions are checked optically.
- ISO 10555-1:2023 Intravascular catheters general requirements; catheter tips and distal ends are examined under magnification and tubing dimensions checked.
- JIS B 7153 Japanese industrial standard for measuring microscopes, widely used by makers to state and test XY stage accuracy.
- ISO 10360-7:2011 Acceptance and reverification tests for coordinate measuring systems with imaging probing, applicable to camera-based and video measuring options.
- ISO 14253-1:2017 Decision rules for proving conformity or non-conformity when measurement uncertainty is taken into account, important for legal DTL decisions.
- ISO/IEC 17025:2017 Accreditation standard for testing and calibration labs; needs calibrated equipment with SI-traceable certificates and stated uncertainty.
- 21 CFR Part 11 US FDA rule on electronic records and signatures; relevant only when the measuring software stores results used for batch release.
Common mistakes in tenders for this equipment
- Copying one maker's exact figures (a particular stage size, accuracy formula or camera megapixels) so only one brand can comply; write 'not less than' minimums and an accuracy formula that several makers meet.
- Buying a digital inspection microscope with on-screen pixel measurement but no linear scales on the stage, then using it for dimensions longer than one field of view; a measuring microscope needs scales on X and Y.
- Asking for display resolution (0.1 um) as if it were accuracy; ask for the XY accuracy formula and verify it at installation with a certified glass standard.
- Using proprietary names for edge detection tools, data processors or software instead of describing the function and demonstrating repeatability at installation.
- Ordering the microscope without needle holders, end-view holders, catheter holders or ring light, so bevels, lumens and burrs cannot actually be examined.
- No ISO/IEC 17025 accredited calibration in the bid and no fixed-price calibration after warranty, so DTL results cannot be defended.
- Installing it on an ordinary table in a hot, dusty room; vibration and temperature changes spoil micron-level measurement at 200x and above.
- Asking for DRAP medical-device registration or ISO 13485 for a laboratory measuring instrument, which only confuses bidders and reduces competition.