Originally Published MPMN October
2004
SPOTLIGHT
MicrotechnologyOptocouplers
Two types of optocouplers are available for use in implantable applications.
The photovoltaic and phototransistor optocouplers provide gate drive voltage
and effective isolation in small surface-mount packages. The 52464 photovoltaic
optocoupler consists of an LED and photovoltaic detector in a 125-mil-package
and supplies dc voltage for driving field-effect transistors (FETs) and/or insulated
gate bipolar transistors (IGBTs). The 52465 phototransistor optocoupler comes
in a 95-mil-square package size and has an LED and a phototransistor that provides
optical isolation. Both components can be attached with epoxy or solder and
are suitable for hybrids or COB applications. Micropac Industries Inc.,
Garland, TX www.micropac.com
Precision metal parts
Precision metal parts as small as 1 mm diam are produced using CNC machines.
Many metals can be cut and machined using the company’s twin-spindle CNC
micromachining center. Twin-spindle machines eliminate all secondary operations
and handling. Machining operations such as turning, milling, drilling, and deburring
are accomplished within the machine for accuracy and control. MicroGroup,
Medway, MA www.microgroup.com
Data acquisition system-on-chip
A versatile single-chip data acquisition chain consists of a programmable gain/offset-amplifying,
high-resolution analog-to-digital convertor (ADC), a 120-segment LCD driver,
and a communications interface. The XE88LC02 chip enables ultra-low-power miniature
medical and metering devices to be built with a minimum of external parts. The
programmable 16-plus-10-bits chip uses less than 2 µA in real-time clock
mode and a typical 300 µA/MIPS in sustained computing mode. It connects
directly to any type of resistive sensor and is easily calibrated. Xemics
S.A., Neuchâtel, Switzerland www.xemics.com
DNA capture media
A fibrous media can be bonded into shapes to fit pipette tips, spin columns, and microtiter wells. The DNA capture media uses a dual approach
to DNA isolation. The fiber has a natural affinity with DNA, and the bonded fiber structure functions as a size-exclusion filter. Media performance can be enhanced by using pendant amine or carboxyl groups on the fiber to attach cross-linking chemistries. Filtrona Fibertec, Colonial Heights, VA www.filtronafibertec.com
Optical encoder
A compact, 1/2-in. optical encoder requires minimal behind-panel space. The
Series 62S component features a minimum life expectancy of 1 million rotational
cycles; 8,12,16, 20, 24, 32 detent positions; and an optional integral push
button. If needed, the company will customize the switch, including terminations,
shaft and bushing configurations, and resolutions. The encoder is suitable for
applications where behind-the-panel space is limited. Grayhill Inc.,
La Grange, IL www.grayhill.com
Microsolenoid valve and ceramic pumps
A microsolenoid two-way valve is designed for the dispensing or metering
of fluids in small package sizes. The Geronimo valve uses a microdiaphragm to
isolate the fluid path and provide a durable seal. Specially created for high-density
manifolding applications, the valve features a low internal volume and a diameter
of 0.25 in. The company’s series of small ceramic pumps are self-priming
and are factory-set for a fixed volume of 10 to 1000 µl per solenoid actuation.
The pumps have a low internal volume and a Cv range of less than 1%. An all-ceramic
plunger and seal add resilience to the products. Kloehn Ltd., Las Vegas,
NV www.kloehn.com
Instrument controller
A C-programmable embedded instrument controller with a built-in, touchscreen-operated
GUI can be used in OEM applications such as robotics, portable data acquisition
systems, and scientific instruments. The controller features a high-contrast,
128 ¥ 240- pixel display with a touchscreen overlay, up to 1 MB Flash and
512 K RAM, and precoded device drivers. The unit uses a real-time, multitasking
operating system. It commands eight 8-bit A/D lines, eight digital I/O lines
including timer-controlled and PWM channels, and two RS-232/485 ports. Mosaic
Industries Inc., Newark, CA www.mosaic-industries.com
Turning center
A turning center can micromachine complex parts in a single setup for fast
production and high accuracy. The Deco 13a features 10 independent axes of motion,
software that can program multiple axes of movement with a macro program, and
several rotating tool positions. The single-spindle automatic machine accommodates
part diameters from 13 mm, making it suitable for a variety of small medical
implants and bone screws. Users can enhance machine performance by opting for
12 axes with two additional spindles. Tornos, Brookfield, CT www.tornos.ch
Miniature linear guides
Two series of miniature stainless-steel linear guides are available. The
guides incorporate molded resin in the ball slider recirculation circuits in
order to enhance motion smoothness and minimize slide weight, metal-to-metal
noise levels, and dust generation. Offered in five accuracy grades, the guides
can be supplied with a fine clearance or slight preload based on the customer’s
application. NSK Precision America Inc., Addison, IL www.nskprecision.com
Miniature brakes and clutches
Miniature slip brakes and clutches are typically used for manufacturing
wire-reinforced small tubing used in clearing heart artery blockages, manufacturing
wire stents, and testing small motors. The brakes are typically used for load
simulation and unwind (payout) tensioning of films and wire. Clutches are used
for rewind tensioning and torque limiting. The magnetic particle brake B5DZ
has a torque range of 0.05 to 1 oz-in. The company’s magnetic particle
clutch C5D has a torque range of 0.2 to 5 oz-in. Hysteresis brakes as small
as 0.12 to 5 oz-in. are also available. Independent of slip speed, torque is
varied from near zero to rated torque by varying input current. Long life, even
under constant slip, is assured with the company’s patented magnetic seals.
Placid Industries Inc., Lake Placid, NY www.placidindustries.com
Copyright ©2004 Medical Product Manufacturing News
