The LSS-8000 Inchworm Motor Microdrive System

Positioning of microelectrodes for electrophysiology recordings require micrometer-scale control of high velocity, high acceleration steps. These steps must be achieved with minimum vibration to prevent damage to cells, their processes or connections. For almost 20 years Burleigh has supplied Inchworm® motor systems to help cell physiologists obtain clean penetrations and stable cell recordings.

• 25mm travel
• Programmable step sizes in 0.5µm increments
• Solid state construction of PZT motor
• High speed and acceleration
• Ultra Low Noise drive electronics

The Inchworm Advantage: Increased Yields

Inchworm Technology
The Inchworm motor is a patented solid-state design that creates linear motion without rotation or gears.

Positioning Precision
The Inchworm motor uses an optical position encoder to directly measure the shaft position with 0.5µm resolution. Inchworm motors eliminate errors caused by overshoot and backlash in traditional motor systems. Step sizes can be programmed and commanded in any multiple of the encoder resolution.

High Acceleration and Velocity
Clean penetrations require a micropositioner capable of high acceleration and velocity as well as rapid deceleration. The goal is to avoid dimpling or ripping the membrane which results in severe cell damage. The Inchworm PZT elements respond in microseconds with very high stiffness to achieve high acceleration and velocity. The motor achieves its top speed of 1.5mm per sec within 2 µm of starting. The motor's dynamic velocity range also is important; it can move at any velocity from 1nm per second to 1.5mm per second without gear changes.

Minimum Tip Vibration
The Inchworm motor used in this system utilizes a special lateral stability option (LSO) to ensure that lateral movement of the spindle tip is less than 0.2µm.

Stability
The solid-state ceramic and metal construction of the Inchworm motor provides very high stiffness and low thermal drift. The thermal stability is also enhanced by the zero heat dissipation when the motor is holding position. The closed-loop encoder feedback ensures submicron stability of the electrode tip. Inchworm systems simply hold cells longer!

Ultra Low Noise Controller
The 8200 Controller was developed to provide more than an order of magnitude improvement in EMI noise and improved grounding/shielding. This minimizes interference in electrical recordings.

Model 8005 Handset
Uses push buttons and a potentiometer to control direction, speed, starts and stops. Jog and step mode are selectable. Step size is programmed from the 8200 Controller.

LSS-8000 System Configuration
The LSS-8000 is recommended for intracellular and extracellular recordings in slices and in-vivo. It is offered at a package price compared with the individual components. It includes:

Model IW-811-L Inchworm® Motor
25mm travel, 0.5µm resolution encoder, lateral stability option, 2 meter cables

Model 8200 Ultra Low Noise Controller
Single axis, closed loop, with position and limit displays

Model 8005 Handset
with cable

Other options include:
6 or 50mm travel motors
PC LabView Computer Interface
Up to three axes of independent motor control in each chassis
Mounts and accessories

Mounting:
IW-450 Micromanipulator Mount
IW-460 Kopf Stereotaxic Mount
IW-475 Electrode Mounting Kit
Rack Mount Kit

Extension Cables:

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