Pressure Sensor Placement NEURO TRONIC in p-Motion

Pressure Sensor Placement

NEURO TRONIC System Knee Joint in p-Motion

In p-Motion, a pressure sensor controls the NEURO TRONIC system knee joint. This sensor technology is recommended for patients who are treated bilaterally and for those who have a non-harmonious (atactic) gait pattern. The pressure sensor is located underneath the foot piece of the orthosis. Especially the preparation of the foot piece as well as the wiring of pressure sensor and controller are decisive for the automatic system knee joint to work the best way possible. Both points are described and illustrated in this online tutorial.
The online tutorial Lamination Dummies NM/NT shows how to place the lamination dummies. With a correct preparation, it is possible to convert the system knee joint from p-Motion into e-Motion. If you and your patient decide to use e-Motion (motion sensor), we recommend the online tutorial NEURO TRONIC in e-Motion.

Updates for the NEURO TRONIC knee joint system are made available here on a regular basis. Sign up for the technical newsletter EXPERTMAIL to be informed about this automatically.

 Joint Assembly NEURO TRONIC in p-Motion

Step 1/21

Prepare your workplace for the sensor placement. The surface, where you will adhere the sensor, should be

  • flat,
  • smooth, and
  • stable.

Step 2/21

Mark the position of the pressure sensor with the sensor placing aid on the bottom side of the foot piece. The pressure sensor should be positioned in the centre, in the rear third of the heel. Please consider that the cable should be close to the system joint in order to keep the stroke on it to a minimum.
Note: In general, this tutorial can additionally be used for p-Motion with height compensation. If you have worked with sole rubber underneath the laminate, you need to create a suitable surface for the sensor in the sole rubber.

Step 3/21

Drill a hole with a diameter of 8mm into the outer lateral edge of the foot piece. Afterwards, the sensor cable will be led through this hole.

Step 4/21

Roughen the surface of the pressure sensor area to provide a better grip for the adhesive.

Step 5/21

Mix the adhesive AGOMET® F330 with hardener powder (mixing ratio 100:3). Spread the mixture onto the roughened surface.
Note: Mind the safety data sheet when using the adhesive AGOMET® F330 and the hardener powder.

Step 6/21

Create a flat surface by pressing an appropriate material, e.g. polyethylene (PE), on the adhesive.
Important: Do not remove the material until the adhesive has completely hardened.

Step 7/21

If necessary, redrill the hole and mark the position for placing the sensor again.

Step 8/21

Grind the edge that was created during pressing. Make sure not to damage the flat surface in the process.

Step 9/21

Mount the system ankle joint under consideration of the assembly instructions of the respective manual.

Step 10/21

Stick double-sided adhesive tape on the pressure sensor.

Step 11/21

Now, you need to secure the pressure sensor at its designated place. If you want to adhere a thin outsole under the orthosis, make sure the sensor area is not exposed to any pressure or adhesive. In this way, you avoid impairments of the pressure sensor activation.

Step 12/21

Follow steps 1-20 of the online tutorial NEURO TRONIC in e-Motion for the assembly of the NEURO TRONIC system knee joint.

Step 13/21

Please note that the cable dummy determines the route of the cable and, thus, depending on the route, the length of the cable varies.

Step 14/21

Place the solenoid cable and the pressure sensor cable into the depression created by the cable dummy until the retainer for the controller is reached. Make sure that the pressure sensor cable is long enough so that it is not exposed to any tension during movement of the system ankle joint. Mark on both cables the position of the opening through which the cables are led into the retainer for the controller. This marking indicates the length of the cable sheathed in black.

Step 15/21

Make a second marking on both cables with a distance of 5 to 7cm from the first marking in the direction of the end of the cable. This marking indicates the respective length of the entire cable. Cut the cable with grippers at this marking. Then, you need to strip the cables to the first marking. Use the FIOR & GENTZ stripping tool.

Step 16/21

You can now see two exposed cable wires on each of the two cables. Strip the ends of the cable wires again. Then, twist and tin the braids.

Step 17/21

Adhere the solenoid cable with a small amount of medium viscous fast-acting adhesive into the tibial shell of the orthosis. Start close to the system joint and work your way up to the retainer for the controller. Then, you need to adhere the pressure sensor cable with a small amount of medium viscous fast-acting adhesive into the tibial shell of the orthosis. Start at the pressure sensor and work your way up to the retainer for the controller. Make sure that the pressure sensor cable is long enough so that it is not exposed to any tension during movement of the system ankle joint.
Note: Mind the safety data sheet when using fast-acting adhesive.

Step 18/21

Establish a cable connection to the controller. The four cable connections are marked with numbers from 1 to 4. Put the braids of the pressure sensor into the cable connections 1 and 2 and the braids of the solenoid into the cable connections 3 and 4.
Note: On a bilateral construction with two NEURO TRONIC system knee joints, two braids are each put into the cable connections 3 and 4.

Step 19/21

Then, you need to place the controller into the retainer for the controller.

Step 20/21

Secure the controller by tightening the four screws of the controller.

Step 21/21

Place the delivered batteries according to the information regarding positive and negative poles into the battery compartment of the controller. The LEDs blink when inserting the batteries. This indicates that you can now connect the controller with the multi-purpose device.
You will find detailed information about connecting the controller with the multi-purpose device in the multi-purpose device manual.
Slide the lid onto the controller to close the battery compartment.