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Electromechanical Automation (Motion Control Systems), North America:  

Engineered Custom Modifications





Precise Patient Positioning


Key Considerations:

  • Reliable Point to Point Positioning
  • Manual Control - Easily upgraded to motor driven

Primary Components:

  • 404XR Tables

The Challenge:
A company which produces equipment for radiation therapy requires a two axis (X-Y) positioner which could precisely position a patient (on a hospital bed) for treatment with radiation.
The operator positions the bed to a pre-determined location, determined by the physician, under a radiation head.  A grid is then established with each grid location 12 mm apart. A radiation stream is applied to the affected tissue at the first location. Once the dosage is completed, the patient is then re-positioned to the second grid location for the next dose. This process continues until the affected area is completely treated. While the positioning accuracy requirement is not extremely tight, it must be absolutely reliable with a 100% confidence level.


The Solution:
An (X-Y) linear positioning system comprised of (2) modified 404XR tables with a travel range of 300 X 300 mm. Modifications include hand crank drives, tape scale encoders for positive position feedback, and a black anodized finish. The 404 XR series was chosen because of the following characteristics:

  • it is completely sealed;
  • it is lightweight;
  • it has a tape scale encoder option;
  • it is easily adapted for a manual handcrank
  • it can be easily converted (on site) for motor driven operation.

The first ten units were installed in 1998 and have been successfully operating with zero maintenance required. Since that time an additional 40 units have been in-stalled and performing with complete reliability.






Application Story #1109







Parker Hannifin Corporation, Electromechanical Automation, 9225 Forsyth Park Drive, Charlotte, NC 28273
704-588-3246 or 800-358-9068
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