Thursday 19th April 2012

Miniature Medical leadscrew and nut

Miniature lead screw designs have often been challenging with regards to application performance verses reliability and cost. A recent medical application supplied by Abssac Limited proposed some significant technical obstacles, which were successfully overcome.Using a 3mm diameter stainless steel trapezoidal thread form with a 1mm lead formed the basis of the design within an automated micro syringe device.

The driven nut was used to provide the linear motion that would accurately dispense the drug. The nut was eventually manufactured from Turcite and incorporated an attachment tang which would provide the connection between syringe and plunger. Turcite was suggested as the nut material as it exhibits self lubricating characteristics. However, in an effort to reduce operational drag further and improve efficiency, the lead screw was then coated with Teflon to make a very low friction linear assembly.

The final part measured 30mm in length and is supplied complete with a machined journal for motor connection. Abssac was able to supply the parts on budget and have exceeded reliability and performance demands set by the customer.

Please call Phil Jones for further details

Tel : 01386 421005