A main field of application for adhesives in medical systems is needle
bonding and syringe assembly – the bonding of stainless steel needles or
cannulas into glass or plastic syringes. These needles are produced in large
quantities which requires rapid and reliable bonding in high volume
production. In addition to their mechanical bond strength, the adhesives used
must allow high-precision production and permanent joining and must
withstand various sterilization methods.
Panacol’s uv curable Vitralit® adhesives exactly meet these requirements.
Vitralit® adhesives are available in various viscosity ranges to perfectly fit the
design of the needle hub and fill the gap between the hub and the needle.
The material of the hub and needle also affects the choice of the adhesive:
Many adhesives are UV-curing, which requires the use of transparent and
UV-permeable materials. For materials that block UV light, such as
polycarbonates, long-wave LED curable adhesives are recommended.
All Vitralit® adhesives recommended for needle bonding are solvent-free and
certified USP Class IV and/or ISO 10993 for use in medical equipment. In
addition, high needle extraction forces were measured with all needle
bonding adhesives even after several sterilization cycles. For visual quality
inspection, fluorescent versions of our medical grade adhesives are also
available.
The choice of the adhesives requires a matching dispensing system for
reliable and precise dispensing in a rapid production environment.
The high quality demands required for medical devices, as this needle
bonding application, confirms the choice for bdtronic’s volumetric dispensing
equipment.
With the mini-dis solution provided by bdtronic, dispensing in microliter range
is made easy, regardless of the adhesive viscosity. Thanks to the continuous
volumetric dispensing, the dispensing is pulsation free ensuring optimal
process speed, repeatability and accuracy.
Finally, the choice of the UV curing equipment depends on the adhesive and
the wavelength which triggers polymerization. For needle bonding with
Vitralit® products you can use either UV-A or visible LED light.
Due to a special LED assembly and an own optimized electric power supply,
Hönle LED Powerline LC guarantees a high-intensive irradiation for fastest
curing and shortest cycle times. In addition, the irradiation time can be
selected in a range of 0.01 – 99.99 sec and thus precisely adapted to the
process requirements.
