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
Image forming apparatus, image forming method, and computer readable medium for identifying target-recording element using detection pattern
Utility knife
Estrogen receptor ligands
Voltage regulator structure that is operationally stable for both low and high capacitive loads
Cooking device and method of manufacture of the same
Method of providing tailor-made software for hospital departments
Mineral, nutritional, cosmetic, pharmaceutical, and agricultural compositions and methods for producing the same
  Randomly Featured Patents
Electric control circuit
Display screen with animated graphical user interface
Method of connecting a bus bar to a capacitor
Method of operating a stoichiometric exhaust gas recirculation power plant
Non-yellowing biocide for control of bacteria in spin finish emulsions used on nylon yarn
Field effect transistor having recessed gate in compositional graded layer
Method and system for mapping GUI widgets
Product marketing sign
Microfluidization of calcium/oxyanion-containing particles
Wall cabinet