Resources Contact Us Home
Wet etch processing

Image Number 4 for United States Patent #7651946.

A method of wet etching produces high-precision microneedle arrays for use in medical applications. The method achieves precise process control over microneedle fabrication, at single wafer or batch-level, using wet etching of silicon with potassium hydroxide (KOH) solution by accurately identifying the etch time endpoint. Hence, microneedles of an exactly required height, shape, sharpness and surface quality are achieved. The outcome is a reliable, reproducible, robust and relatively inexpensive microneedle fabrication process. Microneedles formed by KOH wet etching have extremely smooth surfaces and exhibit superior mechanical and structural robustness to their dry etched counterparts. These properties afford extra reliability to such silicon microneedles, making them ideal for medical applications. The needles can also be hollowed. Wet etched silicon microneedles can then be employed as masters to replicate the improved surface and structural properties in other materials (such as polymers) by moulding.

  Recently Added Patents
Systems and methods for switching supply load current estimation
Wafer-level chip scale package
Context-sensitive views
Interactivity model for shared feedback on mobile devices
System, apparatus, and method for fast startup of USB devices
Image forming apparatus assembled with a fixing member and a pressing member
Sensor controller, navigation device, and sensor control method
  Randomly Featured Patents
Photostable sunscreen compositions containing dibenzoylmethane derivative, e.g., PARSOL.RTM. 1789, and diesters of naphthalene dicarboxylic acid photostabilizers and enhancers of the sun prote
Temper evident ear tag system
Biasing circuit for generating precise currents in an integrated circuit
Corner sweeping brush disposed on a floor sweeper
Network printer
Adjustable plant protector
Process for producing a semiconductor laser mirror by ionic machining
Play data editing device and method of editing play data
Process for the production of polyamines
Process for the solvent treatment of a plastic