How Medical Equipment Manufacturers Ensure Product Quality and Consistency

Quality is not something hospital purchasing departments, and brand owners, think about as a feature-it's a patient safety concern. Any minor defect-in rehabilitation equipment as common as a commode chair, a shower chair, a patient lift, or a walking stick-could be a fall, an injury or a claim. Product consistency from batch to batch is also a critical aspect, as you and your clinical staff-as well as your end user-are counting on the fact that a product unit they have already approved, will be the same as the next. This article outlines how a rigorous medical equipment Quality Control system functions, from the initial acceptance of materials at the retailer through the shipment to your patient, so that you can select suppliers with confidence.

The Foundation: ISO 13485 Quality Management System

The foundation of any robust is the Medical Device Quality Program: ISO 13485:2016. We have built our medical equipment quality control systems around the requirements of this international standard. The standard takes a “process approach” requiring design control, risk management, supplier controls, validation of production, and post market surveillance, to name a few. ISO 13485 contains additional standards for medical devices, including those for traceability, complaint handling, regulatory documentation, etc., as opposed to ISO 9001, a more general standard.

When considering a partner, seek an ISO13485 manufacturer who does not view 13485 as a piece of furniture. This involves routine internal checks, review by management and a continuous improvement process. For instance, KDB Health's ISO 13485—certified production system covers every step of making commode chairs and rollators, from raw materials aluminum extrusion to final packaging.

Incoming Material Quality Control

The quality of the product starts at the receiving dock. A good medical device QC process begins with the careful scrutiny of all the raw materials and components that are used.

Metal materials: Alloy composition, dimensions and surface finish of aluminum tubes and steel components are inspected. Materials that are likely to rust are rejected at once.

Inspection of plastic parts: Warpage and sink marks inspection, impact resistance of injection-moulded parts (seat pans, armrests, backrests).

Fasteners and hardware: Tests screws, bolts and casters for torque consistency and corrosion resistance.

Packaging materials: Cartons, labels and inserts are checked against specifications to prevent damage in transit and non-compliance with regulations.

All materials received are marked with batch numbers making it possible to trace from raw material to finished product. This is an important aspect of medical equipment quality control and cannot be compromised.

In-Process Quality Control (IPQC)

Quality is designed rather than tested into the product during the production process. Important IPQC checkpoints are:

Welding inspection: Metal frames (commode chairs, rollators and patient lifts). On metal frames, weld penetration and consistency is visually inspected. For critical joints, the weld is tested using dye penetrant or ultrasonic methods.

Dimensional checks: Critical dimensions like seat height, armrest spacing, wheel base are taken at predetermined points by calibrated instruments.

Surface finish: The products undergo an adhesion test, thickness, and uniformity test after powder coating or anodizing to ensure that there is no corrosion.

Assembly verification: Inspection of torque requirement setting of fasteners, test of folding mechanism and brake system operation.

Such tests are a useful real-time measure that means any defects will not go onto the next stage of the process, a feature of a good medical device QC process.

Finished Product Testing and Validation

Every product comes out of the factory after going through several final tests:

Load and stability testing: The chairs and shower chairs are tested to 1.5 times the weight they are rated for. This test is particularly challenging for bariatric models (300-500 lbs).

Fatigue testing: Folding elements, wheels and brakes are undergone sped up life-cycle testing. Examples: 200,000 fold-ups on commodes as from the 3-in-1 models to simulate many years of use.

Water resistance: Bathroom product testing includes tests following moisture exposure as well as exposure to frequently used cleaning agents commonly found around the home for a typical bathroom product.

Electrical safety (if applicable): Dielectric strength and leakage current tests are carried out in accordance with IEC 60601 standards for patient lifts having powered functions.

All test results are recorded and kept for regulatory audits – hospital buyers and brand owners can have evidence of the reliability of a product.

Statistical Sampling and AQL Standards

Generally, due to volume limitations, a 100% inspection may not be feasible, or practical/possible even if we wish we could do so for every product going out the door. It is, in many ISO 13485 manufacturer labs, standard practice to do statistical sampling in conjunction with ANSI/ASQ Z1.4 (formerly MIL-STD105E) with defined AQL levels. Normal AQL's;

Critical defects (e.g., loose or missing parts): 0%

Major defect (cosmetic scratches, minor misalignment, etc.): 1.0%-1.5%

Minor defects (such as a smudged label or a creased package): 2.5%–4.0%

If a batch fails AQL, it may be reinspected, reworked, or rejected—protecting your brand from quality issues.

Traceability and Batch Records

Traceability is critical for a field complaint or regulatory enquiry. A well-established system of medical equipment quality control maintains:

Batch production records: Each batch has a different lot number that is connected to the different raw material batches, operators and equipment used.

Inspection logs: QC checks are recorded and corrective action taken - pass or fail.

Shipment records: Each shipment will be accompanied by a Certificate of Conformity (CoC) that provides a summary of the test results of the batch.

KDB Healthcare has a comprehensive batch traceability system for all its commode chairs, shower chairs and walking aids—which means that if a problem ever arose, the product could be recalled and the cause quickly identified.

Continuous Improvement and CAPA

Quality is continuously evolving. A good medical device QC system has a formal Corrective and Preventive Action (CAPA) system:

Root Cause Analysis and Fixes: If it is found that there is a defect (either in-house or as reported by customers), a Root Cause Analysis is undertaken and a fix is put in place.

Preventive actions: Use data from several batches for detecting trends like growing trend of pore in welding and then take corrective actions to inhibit defective features.

Supplier feedback: material suppliers are scored and audited, and low scoring suppliers are replaced.

This cycle of feedback will ensure that quality is enhanced continuously, rather than decreasing.

Third-Party Inspections and Certification

To be extra safe, many hospital buyers will ask for third party inspections (such as SGS, Bureau Veritas, TÜV) before the machines are shipped. Such inspections are welcomed by a transparent manufacturer and the production records and finished goods are made available.

KDB Health is an active coordinator for third party inspections and we are CE, FDA and ISO 13485 certified, showing our dedication to quality control of medical equipment to the highest standard. Our R&D and QC departments work hand-in-hand, ensuring all commode chair, shower & patient lifts produced achieve the international standards required in hospital surroundings.

Conclusion

For products the quality must not occur accidentally. There must be a systematic operation procedures. Procedures begin from goods inward receiving, the material inspection until sending delivery at site to the destination to brand owners, at present time, from an empty stomach purchasing to sending delivery will cause problems in each step to ensure the products quality as, Brandowners choose any supplier of medical products the most important factor is quality management system for it’s already passed the ISO 13485 and has the open mind towards quality.