Precision Mold Manufacturing for Medical Pulse Oximeters

The client sought Rayboen’s expertise to address issues in the production of medical pulse oximeters, including structural integrity, dimensional accuracy, surface sink marks, and short shots. The goal was to avoid molding failures and reduce resource consumption within a limited budget. The solution needed to encompass the entire production process, ensuring low cost and market competitiveness for the product. Rayboen provided a steel injection mold with precision up to 0.05 mm, complemented by an optimized ejection mechanism designed to meet the required specifications.

1.Core Challenges

• Products are trending toward miniaturization and thin-wall construction, featuring a finger-clip ergonomic design. During injection molding, issues such as short shots, uneven filling, and prominent parting lines frequently occur, and ensuring structural stability for small components is also challenging.
• The housing interior must accommodate precision components such as sensors and circuit boards, imposing extremely high dimensional tolerance requirements. Even minor deviations can affect assembly and product functionality.
• The exterior demands a high-gloss, smooth finish with a curved shape that conforms to the finger, making it prone to defects such as dimples and sink marks.
• The client was eager to partner with a professional company specializing in precision injection molding for medical components to bring their innovative designs to fruition. After visiting the facility, the client was confident that Rayboen was the ideal partner.

2.Solutions

• Adopted a single-cavity precision mold design to ensure dimensional accuracy and molding consistency, achieving an ergonomic curved surface and high-gloss finish.
• Strictly implemented the ISO 13485 medical device quality management system to control quality and safety from the outset.
• Conducted multiple rounds of small-batch trial molding before delivery to verify dimensions, appearance, and snap-fit assembly performance.
• Optimized the ejection mechanism and injection molding process to reduce flash, warpage, sink marks, and other defects, thereby improving product yield.

3.Collaboration Outcomes

Through the partnership, the client obtained a high-precision custom mold that effectively resolved common molding challenges for thin-wall, small plastic components, such as short shots, flash, warpage, and surface sink marks. Leveraging the precision mold manufactured by Rayboen, the client was able to achieve stable mass production of finger-clip pulse oximeter housings featuring unique designs and high-gloss, clean surfaces. This enhanced the product’s competitiveness in terms of tactile feel and appearance, while enabling stable, efficient, and low-cost large-scale production.