High tensile strength after plasma treatment of Needle Hubs -- COMPAMED Trade Fair


Tantec A/S

High tensile strength after plasma treatment of Needle Hubs

Tantec NeedleTEC for treatment of needlehubs

Needle hubs requires surface treatment to ensure the glue adheres the needle properly to the needle hub. Tantec delivered a Plasma Treatment System to a manufacturer of needle hubs.

Plasma surface treatment improves bonding and prevents leakage

A plasma treatment chemically roughens the surface, and allows it to “grab onto” the adhesives being applied. The resulting chemical bond that occurs with the surface is thus stronger than a simple mechanical bond.

By increasing the surface energy of needle hubs using a plasma treatment the bonding properties improves – thereby adding extra safety and reliability to the product.

The result of improved wettability is that the adhesive will spread evenly on the hub that connects to a stainless steel cannula and thereby prevents fluids from leaking. And the result of the strong bonding between adhesive and hub will ensure that the cannula will not move or release from the hub during use.

Traditional methods of assembling the needle resulted in limitations

Needle assembly is a unique challenge. The joint that connects a stainless-steel cannula to a plastic hub must be well sealed to prevent fluids, such as blood or medicine, from leaking. Only a high-strength joining method will ensure that the cannula’s small and cylindrical joint will not move or release from the hub during use.

Historically, manufacturers have used a variety of methods to assemble disposable needles, such as molding, welding, interlocking, or sealing. However, these methods have many limitations, such as being very time-consuming and expensive. For example, insert moulding requires extreme precision to ensure no leak paths are present when fixing the cannula to the plastic hub. To maintain the aesthetic appearance of the needle assembly during welding, great precision is required to hide or eliminate weld flashes. Similarly, mechanically interlocking the cannula to the hubs has limitations due to expense and resource requirements, while joint sealing poses even greater challenges.

Safer alternatives to needle designs required

The OSHA-driven Needlestick Safety and Prevention Act requires needle manufacturers to provide safer alternatives to existing needle designs, resulting in hundreds of new designs annually. In an attempt to comply with this act while remaining competitive in the marketplace, manufacturers are exploring the uses of adhesives to facilitate needle assembly.

A wide variety of medical devices incorporate a needle or cannula:

Insulin syringes
Hypodermic and angiographic needles
Blood lancets
Pre-packaged medical syringes
Introducer catheters
Intravenous sets
Venous-winged and port-access infusion sets
Blood collection sets.

Tantec Plasma treatment of needle hubs solves previous challenges

Tantec solutions for treatment of plastic needle hubs, solves the previously mentioned problems related to bonding and leakage. Treating the needle hub’s surface increases surface wettability and adhesion properties through electrical discharge.

Due to the treatment’s ability to achieve extremely high tensile strength, it has become one of the most common methods used to treat hub surfaces.

For example, untreated hubs present tensile strengths between 18-25N, whereas treated hubs achieve tensile strengths up to 75N.

Tantec develops customised solutions as integrated systems which is designed to cope with the high speeds of high performance needle assembly lines. The ability to treat difficult-to-reach hub recesses makes Tantec plasma treatment solutions easy to use and safe treatment solution for needle hubs.