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
Bimacrocylic HCV NS3 protease inhibitors
Generating and suggesting phrases
Adult novelty toy
Low-latency viterbi survivor memory architecture and method using register exchange, trace-back, and trace-forward
Quality control scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems
Metformin glycinate salt for blood glucose control
Optical illumination device
  Randomly Featured Patents
Methods and apparatus for secure programming of an electricity meter
Image forming apparatus featuring a pre-smoothening mode performed prior to formation of a toner image
Structural body formed by friction stir welding and having protrusion at the weld provided prior to the welding
Medical instrument and method for endoscopic removal of the saphenous vein
Cold water-insoluble polyvinyl alcohol pouch for the controlled release of active ingredients
Hydrotreating of recycled block copolymer solvent
Computer front bezel
Carbostyril derivatives including cilostazol for treating fatty liver
Method and apparatus for requesting and transmitting characteristic indicators in a wireless communications network
Fused connection adapted to fail under different overloads acting in different directions