Introduction

The first camera probe prototype of Meditech has been completed and tested. It includes:

 

  • 16x2 alphanumeric LCD display
  • Set of five control buttons and one three-states position button to enable the different features and parameters, manage diagnostic tests and control the device
  • WiFi connection to the rest of Meditech networking device
  • 12 RGB LEDs ring around the camera

 

The prototype has been assembled in a custom designed container. As this probe is mainly based on visual detection there is the need to connect it to the main Meditech structure moving the probe nearby the patient. In this version the camera head (with LEDs) is fixed but a better solution should include an articulated flip movement.

 

Design

The following images shows the design components to be milled. The material is white acrylic 5 mm thick. A better solution can be reached using 3 mm thick to reach some design simplifications.

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Above: top and bottom sides.Below: the three lateral sides.

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Below: the components of the camera head enclosure and the opaline plastic cover for the LED rings. It is on a separate design as is has been milled with opaline white transparent acrylic sheet, 3mm thick

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Components

The following images shows the milled and refined components, ready for assembly. Note that the LCD display has a transparent cover protection (2mm thick plexyglas)

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Assembly

Excluding the transparent LCD protection, the camera head parts and the LED cover ring that was glued with chyanoachriate all the parts has been assembled with screws for any future modification.

Below: Raspberry PI B+ screwed on the base and the LCD protection glued on the top frame. To fix the Raspberry PI the PiFaceCAD has been removed; note the camera flat cable already molded to fit in the camera head on top of the box and the pass-through connector for the LED ring control.

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Below: the assembly steps of the camera and LED ring cables inside the guide and the back part of the camera head. The camera is kept aligned with a piece of adhesive soft strip.

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The finished camera head mounting and the sides assembled together and screwed.

Below: views of the camera head and LEDs ring in the final assembly.

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Below: views of the camera probe finished prototype

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Testing

The following images shows the camera probe testing. The test has been made with the system status displayed on the LCD (as it changes continuously), the LED ring test and the camera previewing a video without recording. The test has been left active for about 12 hours.

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Test Video

The test video shows some seconds of the 12 hours test process with the probe controlled via terminal from another computer connected to the same WiFi network.