MEDICAL | INNOVATION
Right: Topas 8007S-04 cyclic olefin copolymer from Polyplas- tics USA has been selected by Tandem Diabetes Care Inc. for use in wearable
insulin delivery pumps
natural and isoprene rubber, and provide processing advantages over TPV elastomers. The company says that stoppers moulded from the new Medalist TPEs perform well in both glass and plastic syringe barrels, achieving a consistent piston release and travel force due to a low coefficient of friction. The compounds can be overmoulded onto plungers, eliminat- ing an assembly step. In addition to grades for overmoulding onto
Below: Teknor Apex Company has introduced new medical- grade thermo- plastic
elastomers for injection moulded plunger
stoppers to provide improved syringe
performance
polypropylene, speciality grades are available that, unlike TPVs, can be overmoulded onto engi- neering resins like polycarbonate, ABS, PC/ABS, acrylic, acetal, PBT, and COPE. Also unlike most TPVs, the Medalist TPEs do not require pre-drying. The Medalist TPEs exhibit improved compression set in comparison with competing TPEs, making possible a more secure seal. The compounds can be moulded in high-cavitation tooling. All grades are sterilisable and are available in natural or black colours. According to the company, Medalist com- pounds provide substantial advantages over rubber, which has been the predominant material for use in syringe stoppers. TPEs avoid the curing step required in rubber processing, eliminating concerns about extractables and leachables, and, unlike rubber, their scrap can be recycled. As thermoplastics, TPEs process in considerably shorter moulding cycles and lend themselves to more intricate designs and tighter dimensional tolerances. Topas 8007S-04 cyclic olefin copolymer (COC)
from Polyplastics USA has been selected by Tandem Diabetes Care of San Diego, US for use in wearable insulin delivery pumps. The simple-to-use T:slim X2 Insulin Pump is the smallest pump available and the only one capable of remote feature updates. It is the first CGM-enabled pump approved to let users make treatment decisions without pricking their finger. The pumps carry precision-moulded disposable cartridges which
consist of several parts moulded of Topas 8007S-04. The components are produced in complex geometries and tight tolerances of less than 0.001 inch (0.025 mm). The company says that the medical grade
material was selected over competitive thermo- plastics due to its purity, drug compatibility, biocompatibility and dimensional stability. It says that as a leading healthcare plastic, the drug-con- tact material delivers consistent, reproducible performance and facilitates miniaturisation of drug delivery systems. Topas COC can also be moulded with zero draft for maximum precision of drug delivery. Unlike other engineering thermoplastics or glass, Topas COC offers a non-ionic, minimally reactive surface. This non-polar substrate does not promote adsorption, denaturation, aggregation, or precipitation. With very low leachables and extractables, Topas preserves long-term drug purity, enabling better performance and patient safety, says the company.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.husky.co �
www.engelglobal.com �
www.waldorf-technik.de �
www.weimei-mold.com �
www.arburg.com �
www.rittinghaus-gmbh.de �
www.sumitomo-shi-demag.eu �
www.mhs-hotrunners.com �
www.milacron.com �
www.conairgroup.com �
www.americhem.com �
www.clariant.com �
www.kraiburg-tpe.com �
www.polyone.com �
www.rtpcompany.com �
www.teknorapex.com �
www.polyplastics.com
30 INJECTION WORLD | September 2018
www.injectionworld.com
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