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Miniature Seals: Low Torque Performance for the Medical Industry

A.W. Chesterton
AW Chesterton Miniature Seals Low Torque Performance for the Medical Industry

Miniature Seals: Low Torque Performance for the Medical Industry

Challenge

A company specializing in medical devices builds swivel systems used for infusion and blood sampling in laboratory research. The system must allow 360° rotation and exhibit low torque. The fluid connections are 20 gauge or smaller with the swivel body less than ¼” diameter. Seals for these swivels must be leak-tight, low friction, and miniature.

AW Chesterton Miniature Seals Low Torque Performance for the Medical Industry

Infusion and blood sampling swivel.

Solution

A Chesterton Series 200 – Elliptical Spring-Energized Seal was designed for this application. Since the seal was sized for a gland less than 0.050” in cross-section and low friction was a requirement, an elliptical spring was fabricated as it could be made in a miniature profile with low spring force.  The seal jacket was made from Virgin PTFE and spring from 300 stainless steel.

AW Chesterton Miniature Seals Low Torque Performance for the Medical Industry

Chesterton Series 200 – Elliptical Spring-Energized Seal.

Results

Seal performance was verified through functional trials, where Chesterton also assisted in the creation of seal installation tools and guidelines. The Chesterton Series 200 – Elliptical Spring-Energized Seal provided successful low torque sealing per the customer’s test regime and acceptance criteria, ongoing factory acceptance testing, and subsequent performance in the field.

Read more case studies from A.W. Chesterton.

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