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
Method of providing user-tailored entertainment experience at hospitality location and hospitality media system thereof
Passive charge cord release system for an electric vehicle
Electronic dispersion compensation within optical communications using reconstruction
Systems and methods for minimization or elimination of diffusion effects in a microfluidic system
Frequency offset estimation apparatus and method of OFDM system
Method and structure for adding mass with stress isolation to MEMS structures
  Randomly Featured Patents
Adapter for mowing blade with star
Can opener
Hot carrier protection circuit
Composition and method for making a proppant
Mobile communication system, wireless controller, and extension transmitting/receiving server device selecting method
Method of enabling electrical connection to a substructure forming part of an electronic device
Portable seating device
Bale wrapping device
Process for the preparation of halogenated phenylmaloates
Aft end igniter for full, head-end web solid propellant rocket motors